WO2001024197A1 - Device for driving control rod, method and device for testing, and torque-converter transmission - Google Patents
Device for driving control rod, method and device for testing, and torque-converter transmission Download PDFInfo
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- WO2001024197A1 WO2001024197A1 PCT/JP2000/006785 JP0006785W WO0124197A1 WO 2001024197 A1 WO2001024197 A1 WO 2001024197A1 JP 0006785 W JP0006785 W JP 0006785W WO 0124197 A1 WO0124197 A1 WO 0124197A1
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- WIPO (PCT)
- Prior art keywords
- control rod
- electric motor
- torque
- driving
- drive mechanism
- Prior art date
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- 238000012360 testing method Methods 0.000 title claims description 61
- 230000005540 biological transmission Effects 0.000 title claims description 44
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Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/12—Means for moving control elements to desired position
- G21C7/14—Mechanical drive arrangements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/12—Means for moving control elements to desired position
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Definitions
- Control rod drive device Description: Control rod drive device, test method therefor, test device therefor, and torque transmission device
- the present invention relates to a control rod drive device, a test method and a test device therefor, and a torque transmission device that can be suitably used for the control rod drive device.
- the control rod drive mechanism which is integrated with the control rods, controls the reactivity of the reactor and is particularly important for plant operation and safety.
- Figure 7 shows a conventional electric control rod drive mechanism.
- FIG. 7 is a longitudinal sectional view showing an electric control rod drive mechanism (C R D) provided at the lower part of the reactor pressure vessel of the boiling water reactor (BWR) and driving the control rod (C R) up and down.
- the control rod drive mechanism has a motor assembly at a lower end, and a vertical rotating shaft 1 of the motor assembly is connected to an upper vertical drive shaft 3 via a gear coupling 2.
- a screw shaft 4 is rotatably connected to the drive shaft 3, and a nut 5 is screwed to the screw shaft 4 via a ball (not shown) to form a ball screw mechanism. The nut 5 moves up and down by the rotation of the screw shaft 4.
- the outer periphery of the nut 5 is provided with a plurality of pairs of rollers 6 arranged in pairs vertically, and these rollers 6 narrow the axial mounting plate 8 formed on the inner peripheral surface of the guide tube 7. It is attached to carry.
- a hollow piston 9 extending upward around the screw shaft 4, and a control rod 11 is connected to an upper end of the hollow piston 9 via a coupling 10.
- a ferrule tube 13 is installed in the CRD housing 12, and the CRD housing 12, the outer tube 13 and the spool bead 14 are connected by bolts 15.
- a spring 16 is provided below the screw shaft 4, and when the nut 5 is moved downward beyond the position where the control rod is completely pulled out, the nut 5 compresses the spring 16. Thus nut 5
- the state in which the spring 16 is compressing is referred to as a “mechanically lowest state” in this specification.
- a buffer 17 is provided at the upper part of the outer tube 13.When the nut 17 is moved upward beyond the state where the control rods are fully inserted, the buffer 17 is compressed by the hollow piston 9 installed at the upper part of the nut 5. You. The state in which the hollow piston 9 compresses the buffer 17 in this manner is referred to as a “mechanical uppermost state” in this specification.
- the motor assembly has a motor 18, an electromagnetic brake 19 and a position detecting device 20.
- the control rod is driven by the motor 18, the control rod position is held by the electromagnetic brake 19, and the position of the control rod is confirmed by the position detection device 20.
- a stepper motor is used as the motor 18 and an invertor power source is used as the motor power supply 21. I have.
- the motor assembly is connected to a spool bead 14 via a motor bracket 22.
- a gland packing 23 is used at a portion of the spool piece 14 where the drive shaft 3 penetrates.
- a coil spring 24 and a magnet housing 26 supported by the coil spring 24 and having a built-in separation detection magnet 25 are provided inside the spool piece 14.
- the load applied to the coil spring 24 decreases due to, for example, the hollow piston 9 being separated from the nut 5, the coil spring 24 expands, and the separation detection magnet 25 moves upward accordingly.
- a separation detection probe 27 having a built-in reed switch operated by magnetism is installed outside the spool bead 14 so that the movement of the separation detection magnet 25 can be detected.
- a scrum position detecting magnet 28 is built in the hollow biston 9. In the guide tube 7, a full-in detection magnet 29 that moves with the compression of the buffer 17 at the time of the scrum is installed.
- a scrum position detection probe 30 having a built-in magnetically operated reed switch is provided outside the control rod drive mechanism housing 12, and a scrum position detection magnet 28 and a screen detection magnet 29 are provided. Movement can be detected.
- the screw shaft 4 rotates via the rotation shaft 1 and the drive shaft 3, and the rotation of the screw shaft 4 causes the nut 5 to move up and down. Move.
- the rotation of the nut 5 is regulated by the mounting plate 7 via the roller 6 and moves up and down.
- the hollow screw 9 and the control rod 11 move up and down in conjunction with the up and down movement of the nut 5, and the up and down movement of the control rod 11 adjusts the amount of insertion and withdrawal into the core and controls the furnace power. .
- the hollow piston 9 connected to the control rod 11 via the coupling 10 is quickly pushed up by the water pressure supplied from the water pressure control unit and is separated from the nut 5, and the control rod 11 is quickly removed. Insert into the core. At this time, the separation of the hollow bistone 9 from the nut 5 is detected by the separation detection probe 27. The positions of the control rods 11 during and after the scrum are detected by the scrum position detection probe 30.
- control is performed by connecting a control rod friction measurement test device to the water pressure control unit and supplying water pressure to the control rod drive device via the test device. Insert the rod into the core. At this time, the operation of the control rod drive mechanism is the same as that of the scrum except that the insertion speed is low. In the control rod friction measurement test, the state of friction between the control rod and peripheral devices is confirmed by measuring the fluctuation of water pressure during the insertion.
- the control rod drive mechanism described above has a gland packing 23 as a shaft seal for the spool piece 14 and a stepper motor using an invertor power supply as the motor 18.
- improvements such as (1) removal of the spool bead shaft seal by adopting a magnetic coupling (magnet coupling) and (2) change of motor type (induction motor) are being studied.
- magnet coupling magnet coupling
- induction motor induction motor
- the conventional electric control rod drive mechanism shown in Fig. 7 employs a stepping motor as the motor and an invertor power supply as the motor power supply.
- the problem is that the system is complicated and the amount of power supply is large.
- the control rod drive mechanism using an induction motor which is currently being studied, requires a simplified power supply system.
- optimization of the power supply unit and control unit when applying an induction motor has not yet been performed, and no means has been established to confirm the soundness of the drive performance.
- the present invention has been made in view of the above circumstances, and establishes a control rod drive mechanism and related systems such as a power supply device and a control device, as well as maintenance means and test means, while providing a highly reliable control rod drive mechanism.
- the purpose is to provide.
- control rod driving device having any of the following features.
- the first feature is that an induction motor is used as a control rod driving force source in place of the conventional motor-powered motor that uses an overnight power supply in the FMCRD. Switches to be multiplexed and each switch can be switched independently. What you can do is in As a result, the power supply and the control device can be simplified and optimized, and control rod drive due to malfunction or the like can be prevented to improve reliability.
- a second feature resides in that an induction motor is used as a control rod driving force generation source, and the control rod drive speed calculated based on detection of the control rod position is monitored.
- the rotation speed of the induction motor fluctuates according to the load.
- the third feature is that the control rod drive is provided with means for measuring the control rod stop position or control rod drive distance, and the measured stop position or control rod drive distance and the control rod drive when the control rod drive is sound The purpose is to compare the assumed control rod stop position or control rod drive distance. As a result, it is possible to confirm whether the control rod drive mechanism has sound drive performance in consideration of load fluctuation, deterioration, etc. of the control rod drive mechanism, and to take appropriate measures such as status display and alarm according to the status Can be taken.
- the fourth feature is that a plurality of brakes are provided in the control rod drive mechanism, and the plurality of brakes are operated at different timings. As a result, the load on one brake can be reduced.
- the fifth feature is that multiple brakes are provided in the control rod drive mechanism, and the holding torque at standstill of each brake alone is set to be higher than the torque required to maintain the control rod position during normal operation of the reactor. . In this way, even if one brake loses its function, the position of the control rod can be reliably maintained, and the reliability can be improved.
- a sixth feature is that in a control rod drive mechanism in which a magnetic coupling is provided in a driving force transmission path from the electric motor to the control rod, a member on the motor side and a part on the control rod side with respect to the magnetic coupling. There is provided means for detecting the rotational position of the material. In this way, even if the magnetic coupling loses synchronism, it is possible to detect it by comparing the two rotational positions, and according to the state, display the status, alarm, and stop the drive. It is possible to take appropriate measures.
- a moving speed of the control rod is detected when driving the control rod, or
- a control rod drive device characterized by detecting current, voltage or power supplied to an induction motor, and measuring the friction between the control rod and the drive mechanism and its surrounding members based on the absolute value or fluctuation of the detected value.
- the rotation speed of the induction motor fluctuates according to the load. Also, when the load of the induction motor changes, the state of supply of electric energy to the induction motor changes. Therefore, by measuring the control rod drive speed or the absolute value of the energy supplied to the induction motor or its fluctuation, it is possible to confirm the load fluctuation such as control rod friction.
- Control rod friction measurement is performed during periodic inspections of boiling water nuclear power plants, but by performing measurement using the method described above, the work can be simplified and the work process can be shortened. It can be implemented outside the radiation control area, and it will be possible to improve workability and reduce exposure.
- a control rod drive device including a drive mechanism including: a motor assembly including a motor; a spool joint; and a magnetic joint having a pair of joint elements separated by a spool bead.
- the test apparatus includes a torque applying means capable of applying a torque to a joint element on the motor assembly side or a shaft connected to the joint element, which constitutes the magnetic joint, with the spool bead attached to the drive mechanism. And torque measuring means for measuring the applied torque.
- the test method is applicable when the drive mechanism has a ball screw mechanism that converts the rotary motion generated by the motor into a linear motion. This method is applicable when the spool piece is attached to the drive mechanism.
- the positions of the nuts that make up the ball screw mechanism Set the mechanical lower limit state or the mechanical upper limit state, and apply torque to the joint element on the motor assembly side that constitutes the magnetic coupling or the shaft connected to this coupling element, and check if there is any abnormality in the magnetic coupling. Is determined.
- the shaft of the motor assembly is rotated from the lower portion of the motor assembly, and connected to the joint element on the motor assembly side or this joint element via the shaft of the motor assembly. It is preferable to apply a torque to the bent shaft.
- test apparatus and test method it is not necessary to remove the spur piece for the purpose of confirming the soundness of the magnetic coupling, and it is possible to reduce the amount of work, processes, and exposure at the time of regular plant inspection.
- a control rod drive device including a drive mechanism including: a motor assembly including a motor; a spool piece; and a magnetic coupling having a pair of coupling elements separated by a spool piece.
- a new test apparatus is provided which is applicable and can check the integrity of the magnetic coupling and the spool piece while the spool piece is attached to the drive mechanism.
- This test device can be connected to the joint element on the control rod side or the shaft connected to this joint element that constitutes the magnetic joint, and controls the rotation of the joint element on the control rod side or the shaft connected to this joint element.
- the test apparatus is connectable to a control rod-side coupling element or a shaft connected to the control rod-side coupling element constituting the magnetic coupling, and is connected to the control rod-side coupling element or to this coupling element.
- Torque applying means for applying torque to the shaft, and a coupling element on the motor assembly side or a shaft connected to the coupling element which constitutes a magnetic coupling, and a coupling element on the motor assembly side or this coupling element.
- Rotation restricting means for restricting rotation of the shaft connected to the shaft.
- the test equipment shall be connected to one of the coupling element on the control rod side or the shaft connected to this coupling element, or the coupling element on the motor assembly side or the shaft connected to this coupling element. It can be configured to further include a torque limiter that is connectable and that limits the torque applied by the torque applying means.
- the test device can be connected to one of the joint element on the control rod side or the shaft connected to this joint element, or the joint element on the motor assembly side or the shaft connected to this joint element, and It may be further provided with a rotation angle measuring means for measuring a rotation angle of the joint element, a shaft connected to the joint element or a joint element on the motor assembly side or a shaft connected to the joint element.
- the soundness of the magnetic coupling can be checked by measuring the transmission torque of the magnetic coupling.
- the test can be performed in a place with a good working environment outside the PCV, and workability can be improved and exposure can be reduced.
- the test apparatus may further include pressure supply means for pressurizing the inside of the spool piece, and pressure measurement means for measuring the pressure inside the spool bead. According to this, the spool bead is removed. In this case, a pressure test can be performed by pressing the inside of the spool bead partition wall.
- an electric motor assembly including an electric motor, a spool bush, and a magnetic coupling having a pair of coupling elements separated by a spool piece, and a driving force generated by the electric motor.
- An inspection device for a control rod drive device including a drive mechanism for transmitting the control rod to a control rod via a magnetic coupling to raise and lower the control rod is provided.
- This inspection device includes a first radial position fixing means for fixing the position of one of the joint elements constituting the magnetic joint or a shaft connected to the joint element in the radial direction, and the other joint constituting the magnetic joint. Second radial position fixing means for fixing the position of the element or the shaft connected to the joint element in the radial direction. Using this inspection device, the spool piece is disassembled or assembled with the axis of the spool piece and each joint element fixed.
- the magnetic joint Since the magnetic joint has a strong magnet built in, if disassembly / assembly is performed with the axis not fixed, the magnetic joint will be pulled by the force that attracts the inner and outer magnetic joints or the magnetic joint and the surrounding magnetic material. May hit the spool bead bulkhead, etc., and cause damage to the magnetic joint. With the axis fixed, the inner magnetic joint and the outer magnetic joint By performing disassembly / assembly, it is possible to prevent damage to the equipment and safely perform disassembly / assembly.
- a novel torque transmission device suitable for use in a control rod drive device.
- the torque transmission device includes a first coupling element that includes a plurality of magnets and is connected to a first shaft, a second coupling element that includes a plurality of magnets and is connected to a second shaft,
- a torque transmission device having a magnetic coupling including: a first jacket that water-tightly or air-tightly covers all magnets of the first joint element; and a water-tight or air-tight seal that covers all magnets of the second joint element.
- a third jacket that water-tightly or air-tightly covers part or all of a magnet built in the first joint element inside the first jacket.
- the first coupling element of the torque transmission device is installed inside the spool rib partition, and the second coupling element of the torque transmission device is installed outside the spool bead partition wall.
- the joint element is configured to be installed, and the magnet covered by the third jacket of the first joint element functions, and the magnet is covered by the third jacket of the first joint element.
- the torque transmission device be configured so that the torque transmission device has a maximum transmission torque greater than or equal to the torque required to maintain the control rod position during normal operation of the nuclear reactor in a state where the magnet does not function. In this way, a highly reliable control rod drive mechanism using a magnetic coupling can be constructed.
- FIG. 1 is a diagram illustrating a first embodiment of the present invention, and is a cross-sectional view along an axial direction schematically illustrating an embodiment of a control rod driving device according to the present invention.
- FIG. 2 is a conceptual diagram illustrating the configuration of the magnetic coupling shown in FIG. 1,
- FIG. 3 is a diagram illustrating a second embodiment of the present invention, and is a schematic diagram illustrating an inspection method of a magnetic coupling and an apparatus therefor,
- FIG. 4 is a graph illustrating an example of a torque characteristic of a magnetic joint.
- FIG. 5 is a diagram illustrating a third embodiment of the present invention, and is a schematic diagram showing a spool bead test device
- FIG. 6 is a view for explaining a fourth embodiment of the present invention, and is a schematic view showing a spool bead inspection device, and
- FIG. 7 is a cross-sectional view along the axial direction schematically showing a conventional control rod driving device. Description of the preferred embodiment
- FIG. 1 schematically shows a lower structure of the control rod drive mechanism according to the first embodiment, that is, a structure of a spool bead portion and an electric motor assembly portion.
- the structure above the spool bead 14 is the same as that of the prior art described with reference to FIG. 7, and the same reference numerals as in FIG. Are omitted.
- C also, regarding the lower structure, members that are the same as or similar to the members described in FIG. 7 are denoted by the same reference numerals as those in FIG. 7, and redundant description is omitted.
- the control rod drive mechanism shown in Fig. 1 is composed of a magnetic joint composed of an inner magnetic coupling element 31 and an outer magnetic coupling element 32 separated by a spool piece 14, a partition, a separation detection magnet 25, a drive shaft 3, etc. have.
- An electric motor assembly is provided below the spool bead 14, and an outer magnetic coupling 32 on the spool bead 14 side and a rotating shaft 1 on the electric motor assembly side are connected via a force coupling 2.
- the motor assembly includes a holding brake 19, a position detection device (sync position resolver) 20, a transmission 33, and an induction motor 35 with a braking brake 34 attached.
- the holding brakes 19 and the braking brakes 34 are the torques required to maintain the control rod position during normal operation of the reactor. Has torque.
- both the holding brakes 19 and the braking brakes 34 set the holding torque at rest to the torque required to maintain the control rod position during normal operation. Even if the brake function is lost, the control rod position can be reliably maintained, and a highly reliable control rod drive mechanism can be constructed.
- thermometers 36 and 37 are provided between the outer magnetic coupling element 32 and the partition wall of the spool bead 14 and the winding of the induction motor 35.
- the thermometer 36 may be arranged near the outer peripheral surface of the outer magnetic coupling element 32, and the thermometer 37 is positioned near the winding of the induction motor 35 ⁇ at an appropriate position in the casing. May be placed at
- a separation detection probe 27 and a scrum position detection probe 30 are provided outside the spool bead 14. These probes 27 and 30 each have a magnetically operated lead switch. .
- a plurality of reed switches (not shown) of the scrum position detection probe 30 are arranged in the vertical direction, and 0, 10, 40, 60, 100% ( (0% means full extraction, 100% means full insertion state) It is possible to detect the corresponding position.
- the separation detection probe 27 has a separation detection lead switch 38 for detecting the position of the separation detection magnet 25 and a magnetic joint out-of-step detection lead switch 39 for detecting the magnetic field state near the magnetic joint. I have.
- An electric motor power supply 41 is connected to the induction motor 35.
- Motor power supply 4 1 is connected to a fixed frequency power supply 44 of, for example, 6 OHz.
- a variable frequency power supply 45 is provided separately from the fixed frequency power supply 44, and either the fixed frequency power supply 44 or the variable frequency power supply 45 is selectively connected to the motor power supply 41. can do.
- the variable frequency power supply 45 may be a type capable of changing the frequency in a stepped manner or a type capable of continuously changing the frequency.
- the synchronous rotation speed is proportional to the power supply frequency, and the rotation speed also varies depending on the load.
- multiple frequencies can be selected as the motor power supply.
- Medium-speed drive during reactor operation high-speed drive to reduce drive time when the reactor is stopped, and control implemented during plant inspection when the reactor is stopped During the bar friction measurement test, highly flexible operation is possible depending on the situation, such as low-speed drive.
- control rod friction measurement test it is possible to detect load fluctuations such as friction by driving the control rod at a low speed from the fully pulled state to the fully inserted state and measuring the drive speed.
- load fluctuations such as friction
- driving at a low speed makes it possible to clearly detect short-term load fluctuations, etc., and it is a highly reliable test.
- control rod friction measurement test can also be performed by confirming the detected values of these ammeters.
- the reactor since the fixed frequency power supply 44 and the variable frequency power supply 45 of 60 Hz are separately provided, the reactor is connected to the fixed frequency power supply 44 during reactor operation, and the reactor is stopped. During operation, it is possible to connect to the variable frequency power supply 45 as necessary, thereby eliminating the possibility of connecting to the wrong power supply during the operation of the reactor, enabling highly reliable operation.
- a plurality of types of frequencies can be selected.
- fixed voltage power supply 44 and variable voltage power supply 45 may be provided instead of fixed frequency power supply 44 and variable frequency power supply 45.
- the motor power supply device 41 has two switches 40, 40 connected in series. Each of the switches 40 can be independently controlled by a signal transmitted from the control device 42 via a command signal transmission path that is separate from each other.
- the motor power supply 41 is provided with a thermal relay 43 as a protective relay. When the load torque of the induction motor 35 increases, the drive current value supplied to the induction motor 35 increases, and the thermal relay 43 operates. Note that the protection relay is not limited to the thermal relay 43, and another protection relay may be used.
- the holding brake power supply device 46 is also connected to the holding brake 19.
- a fixed frequency power supply (not shown) is connected to the power supply 46.
- the holding brake power supply 46 also has two switches 47, 47 connected in series. Each of the switches 47 can also be independently controlled by a signal transmitted from the control device 42 through a command signal transmission path of a different system.
- the switches 40 and 47 may be contacts or semiconductor switches.
- the inner magnetic coupling element 3 1 that forms the magnetic coupling incorporates 8-pole magnets 50 and 51, and the outer magnetic coupling element 3 2 that forms the magnetic coupling also has an 8-pole magnet 4 8 , 49.
- Each of the magnets 48, 49, 50, 51 has a yoke 53, 54, 55, 56 made of a magnetic material for forming a magnetic circuit 52.
- the inner surfaces of the magnets 48, 49 of the outer magnetic coupling element 3 2 are covered and sealed by a sleeve 57, and the outer surfaces of the magnets 50, 51 of the inner magnetic coupling element 31 are sleeve 5 Covered and sealed by 7.
- the inner and outer magnetic coupling elements 31, 32 are magnetically coupled by the magnetic force of each magnet 48, 49, 50, 51. For this reason, Power can be transmitted between the inner and outer magnetic coupling elements 31 and 32 in a non-contact manner through the partition wall of the spool piece 14.
- magnet A is a smaller magnet than the other magnets 49 (hereinafter referred to as “magnet B”).
- magnet 50 hereinafter, referred to as “magnet C” with the symbol C of the inner magnetic coupling element 31 is the other magnet 51 (hereinafter, “magnet C”) with the symbol D.
- a yoke (hereinafter referred to as “Y”) that is in contact with magnet A of outer magnetic coupling element 32
- the "yoke A”) is smaller than the yoke labeled B (hereinafter “yoke B”). Also.
- the yoke with the symbol C (hereinafter referred to as “yoke C”) in contact with the magnet with the symbol C on the inner magnetic coupling element 31 is smaller than the yoke with the symbol D (hereinafter “yoke D”). It has become.
- the yoke A and the yoke B may be integrally molded, and the yoke C and the yoke D may be integrally molded.
- the small magnets ie, the magnets A and C
- a jacket 59 and have a spacer 60 at an upper portion thereof.
- Fig. 2 (b) shows only the magnet C and its surroundings
- the magnet A and its surroundings are also identical except that the yoke is located on the outer periphery of the magnet.
- the configuration is the same as magnet C and its surroundings (see Fig. 2 (a)).
- magnets A and C N yokes A and C are each provided two at a time, and are arranged at point-symmetric positions with respect to the axis. Are arranged so as to face each other.
- This magnetic joint does not expect the functions of magnets B and D, but uses only the magnetic attraction acting between magnets A and C as the torque required to maintain the control rod position during normal operation of the reactor.
- the maximum transmission torque of 0.3 kgfm or more in terms of shaft conversion is secured.
- the magnets 48 (magnet A) and magnet 50 (magnet C) for two poles are individually The control rod position holding torque during normal operation is exhibited without expecting the functions of the other magnets 49 (magnet B) and magnet 51 (magnet D).
- the step-out of the magnetic coupling can be detected.
- a small magnet is partially incorporated inside the magnetic joint.
- similar effects can be expected when magnets having different magnetic properties (for example, magnetic flux density) are incorporated.
- the controller 42 stops the power supply to the electric motor 35 to stop the drive of the control rod, or the output of the position detector 20. It is possible to display a message indicating that the output of the scrum position detection probe 30 is out of the predetermined relationship with the output of the scrum position detection probe 30 or to generate an alarm. Further later As a measure, it is possible to take appropriate measures such as isolating the control rod drive mechanism as an inoperable control rod, and to construct a highly reliable control rod drive mechanism.
- the control device 42 has the following functions.
- the control device 42 issues a control rod drive / stop command based on the operation of the operator.
- the power supply devices 41 and 46 controlled by the control device 42 start or stop supplying power to the induction motor 35, the braking brake 34 and the holding brake 19.
- control device 42 At the start of control rod driving, the control device 42 first controls the power supply device 46 and first releases the holding brake 19. Next, the controller 42 controls the power supply 41 to energize the braking brake 34 and the induction motor 35 at the same time. Note that the braking brakes 34 and 4 stop holding when they are energized and are released. This causes the rotating shaft 1 to start rotating.
- the control device 42 When stopping the drive of the control rod, the control device 42 first controls the power supply device 41, and first stops the power supply to the braking brake 34 and the induction motor 35 at the same time.
- the braking brake 34 performs a holding operation when the power is not supplied. Then, after the rotation of the rotation shaft 1 stops, the control device 42 controls the power supply device 46 to bring the holding brake 19 into the holding state.
- control device 42 can perform control to issue a drive stop command when the control rod is driven, for example, 4 mm before the stop target position. That is, considering the transmission delay, the capacity of the braking brake 35, and the like, it is considered that the control rod advances by 2 mm or more and stops after the control rod stop command is transmitted from the control device 42. Therefore, by issuing a stop command 4 mm before the target stop position, the accuracy of the stop position is improved.
- the control device 42 knows the position of the control rod based on the signal transmitted from the position detection device 20. C being monitored signal even together from over Bed 2 7 and scrum position detecting probe 3 0
- the controller 42 monitors (a) the temperature of the winding portion of the induction motor 35 by monitoring a signal transmitted from the thermometer 37 to the controller 42, and (b) The temperature of the magnetic joint is monitored by monitoring the signal transmitted from the total 36 to the control device 42, and (c) the control rod drive speed is monitored by monitoring the signal transmitted from the position detection device 20.
- the control rod drive speed can be calculated by differentiating the control rod position detected by the position detection device 20 with respect to time, or from the amount of change per unit time of the control rod position.
- an alarm is issued to the operator by an alarm generator (not shown). If the first predetermined value is exceeded, instead of or in addition to the generation of an alarm, information indicating that fact is displayed by an appropriate display means and transmitted to the operator. Is also good.
- control device 42 issues a drive stop command for the control rod.
- the first predetermined value and the second predetermined value are set, and when each of the predetermined values is exceeded, the control device 42 takes a predetermined action.
- a predetermined range of allowable values is set for the winding part temperature, the magnetic coupling part temperature, and the control rod drive speed of the induction motor 35, and the predetermined range in which each parameter is allowed is set.
- measures such as stopping the motor and generating an alarm may be taken in the same manner as described above.
- the control device 42 issues an alarm when the summary relay 43 is activated, and further issues a control rod drive stop command.
- the abnormality of the control rod be detected quickly, but also the excessive torque applied to the magnetic coupling can be prevented, and the magnetic coupling can be prevented from stepping out.
- an ammeter, a voltmeter or a wattmeter is provided in the power supply device 41, and monitoring is performed by monitoring a signal transmitted from the ammeter or the like to the control device 42.
- the first predetermined value is If it exceeds, instead of or in addition to the generation of an alarm, information indicating that fact may be displayed on an appropriate display means to inform the operator.
- the control device 42 may issue a drive stop command for the control rod.
- the control unit 42 compares the actual stop position after the drive stop of the control rod with the target stop position or the control rod position when the drive stop command is issued, and compares the actual stop position with the target stop position or drive stop.
- the difference from the control rod position at the time of command generation deviates from a predetermined range
- the deviation from the predetermined range is displayed on a display device (not shown), or an alarm is issued to an operator by an alarm generation device (not shown). Emit.
- control device 42 compares the stop position after the drive stop of the control rod with the initial position before the drive start of the control rod, and when the difference between the stop position and the initial position deviates from a predetermined range.
- the departure from the predetermined range is displayed on a display device (not shown) or an alarm is issued to the operator by an alarm generator (not shown).
- the control device 42 compares the output of the position detection device 20 with the output of the scrum position detection probe 30 and finds that the relationship between the two at the control rod full insertion position, control rod full withdrawal position, or other positions. If the specified relationship is not established, an alarm is issued and a control rod drive stop command is issued.
- the control device 42 issues an alarm when the thermal relay is activated, and stops the power supply to the motor.
- the control device 42 can execute a drive mode in which the control rod is inserted once beyond the target stop position during the control rod insertion operation, and then the control rod is automatically pulled out to the target stop position. it can.
- control performed by the control device 42 ensures the accuracy of the control rod drive, and also enables the generation of an alarm based on the state of the control rod drive mechanism and the stop of the control rod drive. It is possible, and the reliability of the control rod drive mechanism is improved.
- FIG. 3 shows a state where the motor assembly is removed from the control rod drive mechanism shown in FIG. In this case, the scrum position detection probe 30 and the separation detection probe 27 are also removed.
- the outer magnetic coupling element 32 has an opening 61 at a position corresponding to the pole of each magnet below the outer magnetic coupling element 32.
- the magnetic sensor 62 can be inserted between the spool piece 14 and the partition wall.
- a first inspection method of the magnetic coupling will be described.
- a first test apparatus having a magnetic sensor 62, a cable 63 connected to the magnetic sensor 62, and a recorder 64 was prepared.
- the magnetic sensor 62 is inserted between the outer magnetic joint 32 and the spool bead 14 partition.
- the magnetic coupling generates a transmission torque by magnetic interaction between the inner / outer magnetic coupling elements 31 and 32. Therefore, by measuring the magnetism (for example, magnetic field strength) between the inner / outer magnetic coupling elements 31 and 32, it is possible to confirm the tendency of the transmission torque to degrade.
- the magnetism for example, magnetic field strength
- a coil or the like is installed between the outer magnetic joint 32 and the spool piece 14 partition wall or in a location where the leakage magnetic field is strong outside the spool piece 14 and the magnetic field is measured. It is also possible to confirm the transmission torque of the magnetic joint by rotating the joint and measuring the induced electromotive force associated with the magnetic field fluctuation generated at that time.
- the magnetic sensor 62, cable 63, and recorder 64 should be installed when conducting the inspection, and removed during reactor operation. Of course, it is possible to always connect the magnetic sensor 62, the cable 63, and the recorder 64 to monitor the state of the magnetic joint.However, by temporarily connecting, the cable wiring required for constant monitoring is possible. A control device is not required.
- the first test equipment was stored outside the containment vessel during plant operation, and Inspection contributes to reduction of exposure during inspection work. By storing the magnetic sensors 62 and the like outside the containment during plant operation, the radiation irradiation conditions and the like to the magnetic sensors 62 and the like are relaxed, which is also effective in ensuring the integrity of equipment.
- the second test apparatus is composed of a shaft 69 to which a torque meter 65, a torque limiter 66, a rotation angle measuring device 67, and a hand-arm 68 are connected.
- the outer magnetic coupling element 32 rotates with respect to the inner magnetic coupling 31 according to the magnitude of the applied torque, and a phase difference occurs between the two.
- a maximum transmission torque is generated when the phase difference is about 22.5 degrees as shown in FIG. Therefore, when the torque applied to the arm 68 is gradually increased, the maximum transmission torque is exhibited near a torsion angle of about 22.5 degrees. If the arm 68 is turned any further, the torque will decrease and the magnetic coupling will step out.
- the following method can be used to confirm that the transmission torque of the magnetic joint is equal to or higher than a predetermined standard value.
- the transmission torque of the magnetic joint can be checked without removing the spool bead 14 from the control rod drive mechanism, and the work amount / process / exposure amount at the time of the regular inspection can be checked. Reduction can be achieved. Also, it is possible to check the transmission torque of the magnetic joint without removing the spool bead 14 from the control rod drive mechanism, and to reduce the amount of work / process / exposure during regular inspection. is there. In particular, in the second inspection method, the transmission torque is directly measured instead of measuring the magnetism, so that the transmission torque can be measured with higher accuracy than the first inspection method.
- an effective method for confirming the soundness of the magnetic coupling can be established, and by using the above method, a more reliable magnetic coupling can be used.
- a control rod drive mechanism can be constructed.
- the same test as described above can be performed without removing the motor assembly.
- the rotating shaft 1 of the motor assembly is configured to penetrate the casing from below the braking brake 34 to protrude, and the second test device is connected to the tip of the protruding rotating shaft 1. This is possible.
- the second embodiment relates to a method and an apparatus for inspecting a spool piece and a magnetic coupling that are part of a control rod drive mechanism.
- FIG. 5 shows a state in which the spool piece 14 removed from the control rod drive mechanism is installed in the spool bead testing device according to the present embodiment.
- the spool piece test apparatus has an upper lid 71 that closes an upper opening of the spool piece 14.
- the top lid 7 1 The shaft 72 is fixed via a fixing jig 73, and a coupling 70 a that can be connected to the inner magnetic coupling element 31 is provided at the lower end of the shaft 72.
- a pressure pump 76 for pressurizing the inside of the spool piece 14 and a pressure gauge 77 for pressure measurement are connected to the upper lid 71.
- the electric motor assembly and the spool bead 14 are removed from the control rod drive mechanism, and placed on the mount 70 of the spool bead test apparatus.
- the coupling 70a is coupled to a shaft of a member supporting the separation detection magnet 25.
- the drive shaft 3 connected to the inner magnetic coupling element 31 cannot rotate.
- the upper lid 71 is attached to the spool piece 14 by a port 74. At this time, the space between the upper lid 71 and the spool bead 14 is sealed with an O-ring 75.
- the second inspection device described in the second embodiment is connected to the coupling 2 coupled to the shaft of the outer magnetic joint 42 located below the spool bead 14.
- the inner magnetic coupling element 31 cannot rotate even if torque is applied to the arm 68. Therefore, the outer magnetic coupling element 32 rotates with respect to the inner magnetic coupling element 31 in accordance with the magnitude of the torque applied thereto, and a phase difference occurs between the two.
- the transmission torque it is possible to measure the maximum transmission torque of the magnetic joint as in the second embodiment.
- a pressure test of the spool bead 14 can be performed.
- the outer magnetic coupling element 32 is fixed, and the second inspection device is connected to the coupling 70a. Even when the inner magnetic coupling element 31 is rotated, the maximum transmission torque of the magnetic coupling can be measured.
- the spool piece 14 is removed from the control rod drive mechanism, and the test device according to the present embodiment installed outside the containment vessel is installed.
- the work can be performed easily as compared with the method described in the second embodiment, which contributes to the reduction of exposure.
- the fourth embodiment relates to a method and an apparatus for disassembling and inspecting a spool bead 14 and a magnetic coupling which form a part of a control rod drive mechanism.
- FIG. 6 shows a state in which the spool piece 14 is installed in the control rod drive mechanism inspection device according to the present embodiment, and the spool bead 14 is being disassembled / assembled.
- the inspection device has a water tank 78 that can accommodate a spool piece 14 and a magnetic coupling.
- a stand 79 on which the spool piece 14 is placed is provided in the water tank 78.
- rails 90 and 91 are laid in the water tank 78 along the axis of the spool bead 14 mounted on the stand 79. On these rails 90, 91, trucks 84, 85 are provided, and on rails 90, 91, c trucks 84, 85 are provided so as to be movable along them. Element 31 and outer magnetic coupling element 32 correspond respectively.
- a shaft 81 is rotatably mounted on the cart 84, and the shaft 81 is located on the same line as the axis of the spool bead 14 mounted on the platform 79.
- a coupling 81 is provided at the end of the shaft 83.
- the coupling 81 can be coupled to a shaft coupled to the inner magnetic coupling element 31.
- a shaft 82 is rotatably mounted on the cart 85, and the shaft 82 is located on the same line as the axis of the spool piece 14 placed on the platform 79.
- a coupling 80 is provided at the tip of the shaft 82.
- the coupling 80 can be connected to a shaft connected to the outer magnetic coupling element 32.
- trolleys 88, 89 are placed on rails 90, 91 and rails 90, 91.
- a spool bead 14 placed on a table 79 is provided so as to be movable in the axial direction.
- the cart 88 is provided with a magnetic jacket 86 that covers the periphery of the inner magnetic coupling element 31.
- the bogie 89 is provided with a magnetic material jacket 87 surrounding the outer magnetic coupling element 32.
- an ultrasonic oscillation facility 92 is provided in the water tank 78 so that the spool piece 14 and the like put in the water tank 78 filled with water can be ultrasonically cleaned.
- a movable magnet 93 is provided in the water tank 78.
- the inspection device has a hose 94 for supplying pressurized air.
- the inner magnetic coupling element 3 1 is fixed with the shafts of the inner magnetic coupling element 31 and the outer magnetic coupling element 32 fixed on the axis of the spool bead 14. Since the magnetic coupling element 32 and the outer magnetic coupling element 32 can be separated and connected, it is possible to prevent the magnetic coupling from being damaged by contact with other devices.
- the surrounding of the inner and outer magnetic coupling elements 31 and 32 are covered with magnetic jackets 86 and 87, respectively, to reduce magnetic field leakage to the surroundings and reduce the effect on peripheral equipment. can do.
- the magnetic powder and the like in the water tank 78 can be collected, and the surfaces of the inner magnetic coupling element 31 and the outer magnetic coupling element 32 can be recovered. Of magnetic powder and the like can be reduced.
- the outer shells 86, 87 of the magnetic material are provided to cover the inner and outer magnetic coupling elements 31 and 32 in the water tank 78. May be covered with a jacket. Also, when storing and transporting the inner and outer magnetic coupling elements 31 and 32 and the spool beads 14, it is possible to reduce the magnetic effect on peripheral devices by covering the surroundings with a magnetic material jacket. it can.
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Abstract
An induction motor (35) is used as a power source for driving a control rod. A plurality of switches (40,40) are provided for connecting and disconnecting the power supply to the induction motor. The switches are controlled separately through different command signal paths by a controller (42).
Description
明 細 書 制御棒駆動装置及びその試験方法及びその試験装置及びトルク伝達装置 技術分野 Description: Control rod drive device, test method therefor, test device therefor, and torque transmission device
本発明は、 制御棒駆動装置並びにその試験方法及び試験装置と、 制御棒駆動装 置に好適に用いることができるトルク伝達装置とに関する。 発明の背景 The present invention relates to a control rod drive device, a test method and a test device therefor, and a torque transmission device that can be suitably used for the control rod drive device. Background of the Invention
制御棒駆動機構は制御棒と一体となり、 原子炉の反応度を制御するものであり、 プラントの運転および安全上特に重要なものである。 図 7に従来の電動制御棒駆 動機構を示す。 The control rod drive mechanism, which is integrated with the control rods, controls the reactivity of the reactor and is particularly important for plant operation and safety. Figure 7 shows a conventional electric control rod drive mechanism.
図 7は、 沸騰水型原子炉 (BWR ) の原子炉圧力容器下部に設けられて制御棒 ( C R ) を昇降駆動する電動型の制御棒駆動機構 (C R D ) を示す縦断面図であ る。 この制御棒駆動機構は下端部に電動機アセンブリを備え、 電動機アセンブリ の垂直な回転軸 1がギアカツプリング 2を介して、 上方の垂直な駆動軸 3に接続 されている。 駆動軸 3にはねじ軸 4がー体回転可能に連結され、 ねじ軸 4に図示 しないボールを介してナット 5が螺合し、 ボールねじ機構が形成されている。 ナ ヅト 5はねじ軸 4の回転により昇降移動する。 FIG. 7 is a longitudinal sectional view showing an electric control rod drive mechanism (C R D) provided at the lower part of the reactor pressure vessel of the boiling water reactor (BWR) and driving the control rod (C R) up and down. The control rod drive mechanism has a motor assembly at a lower end, and a vertical rotating shaft 1 of the motor assembly is connected to an upper vertical drive shaft 3 via a gear coupling 2. A screw shaft 4 is rotatably connected to the drive shaft 3, and a nut 5 is screwed to the screw shaft 4 via a ball (not shown) to form a ball screw mechanism. The nut 5 moves up and down by the rotation of the screw shaft 4.
ナツト 5の外周部には上下に対をなして配置された複数対のローラ 6が設けら れ、 これらのローラ 6はガイ ドチューブ 7の内周面に形成された軸方向の取付板 8を狭持するように取り付けられている。 ナット 5の上部には、 ねじ軸 4を囲ん で上方に伸びる中空ビストン 9が設けられ、 この中空ビストン 9の上端に、 カツ プリング 1 0を介して制御棒 1 1が連結されている。 The outer periphery of the nut 5 is provided with a plurality of pairs of rollers 6 arranged in pairs vertically, and these rollers 6 narrow the axial mounting plate 8 formed on the inner peripheral surface of the guide tube 7. It is attached to carry. Above the nut 5 is provided a hollow piston 9 extending upward around the screw shaft 4, and a control rod 11 is connected to an upper end of the hollow piston 9 via a coupling 10.
C R Dハウジング 1 2内にはァゥ夕一チューブ 1 3が設置され、 C R Dハウジ ング 1 2、 アウターチューブ 1 3及びスプールビース 1 4はボルト 1 5で結合さ れている。 A ferrule tube 13 is installed in the CRD housing 12, and the CRD housing 12, the outer tube 13 and the spool bead 14 are connected by bolts 15.
ねじ軸 4下部にはばね 1 6が設けられ、 制御棒全引き抜き位置を超えてナツト 5を下方へ移動した場合、 ナット 5がばね 1 6を圧縮する。 このようにナット 5
がばね 1 6を圧縮している状態を、 本明細書においては 「機械的最下限状態」 と 呼ぶ。 A spring 16 is provided below the screw shaft 4, and when the nut 5 is moved downward beyond the position where the control rod is completely pulled out, the nut 5 compresses the spring 16. Thus nut 5 The state in which the spring 16 is compressing is referred to as a “mechanically lowest state” in this specification.
またアウターチューブ 1 3上部にはバッファ 1 7が設けられ、 バッファ 1 7は 制御棒全挿入状態をこえてナツト 5を上方へ移動した場合、 ナツ ト 5上部に設置 された中空ビストン 9により圧縮される。 このように中空ビストン 9がバッファ 1 7を圧縮している状態を、 本明細書においては 「機械的最上限状態」 と呼ぶ。 電動機アセンブリは電動機 1 8、 電磁ブレーキ 1 9及び位置検出装置 2 0を有 する。 電動機 1 8により制御棒駆動、 電磁ブレーキ 1 9により制御棒位置保持、 位置検出装置 2 0により制御棒位置の確認がそれぞれなされる。 現在既設の改良 型沸騰水型原子炉 (A B WR ) における電動型制御棒駆動機構では、 電動機 1 8 としてステップモ一夕が採用されており、 電動機電源 2 1としてはインバー夕電 源が用いられている。 A buffer 17 is provided at the upper part of the outer tube 13.When the nut 17 is moved upward beyond the state where the control rods are fully inserted, the buffer 17 is compressed by the hollow piston 9 installed at the upper part of the nut 5. You. The state in which the hollow piston 9 compresses the buffer 17 in this manner is referred to as a “mechanical uppermost state” in this specification. The motor assembly has a motor 18, an electromagnetic brake 19 and a position detecting device 20. The control rod is driven by the motor 18, the control rod position is held by the electromagnetic brake 19, and the position of the control rod is confirmed by the position detection device 20. In the motorized control rod drive mechanism of the existing improved boiling water reactor (AB WR), a stepper motor is used as the motor 18 and an invertor power source is used as the motor power supply 21. I have.
電動機アセンブリは電動機ブラケット 2 2を介してスプールビース 1 4に連結 されている。 The motor assembly is connected to a spool bead 14 via a motor bracket 22.
スプールピース 1 4における駆動軸 3の貫通部には、 グランドパッキン 2 3が 使用されている。 スプールピース 1 4内には、 コイルスプリング 2 4と、 コイル スプリング 2 4に支持されるとともに分離検出マグネット 2 5を内蔵したマグネ ッ トハウジング 2 6と、 が設置されている。 中空ビストン 9がナット 5から分離 した場合等により、 コイルスプリング 2 4にかかる荷重が減少すると、 コイルス プリング 2 4は伸び、 これに伴い分離検出マグネット 2 5が上方へ移動する構造 となっている。 A gland packing 23 is used at a portion of the spool piece 14 where the drive shaft 3 penetrates. Inside the spool piece 14, a coil spring 24 and a magnet housing 26 supported by the coil spring 24 and having a built-in separation detection magnet 25 are provided. When the load applied to the coil spring 24 decreases due to, for example, the hollow piston 9 being separated from the nut 5, the coil spring 24 expands, and the separation detection magnet 25 moves upward accordingly.
スプールビース 1 4外側には磁気により作動するリードスィツチを内蔵した分 離検出プローブ 2 7が設置され、 分離検出マグネット 2 5の移動を検知できるよ うになっている。 A separation detection probe 27 having a built-in reed switch operated by magnetism is installed outside the spool bead 14 so that the movement of the separation detection magnet 25 can be detected.
中空ビストン 9内にはスクラム位置検出マグネット 2 8が内蔵されている。 ガ ィ ドチューブ 7内にはスクラム時のバッファ 1 7の圧縮に伴い移動するフルイン 検出マグネット 2 9が設置されている。 制御棒駆動機構ハウジング 1 2の外側に は磁気により作動するリードスィツチを内蔵したスクラム位置検出プローブ 3 0 が設けられ、 スクラム位置検出マグネッ ト 2 8及びフルィン検出マグネット 2 9
の移動を検知できるようになつている。 A scrum position detecting magnet 28 is built in the hollow biston 9. In the guide tube 7, a full-in detection magnet 29 that moves with the compression of the buffer 17 at the time of the scrum is installed. A scrum position detection probe 30 having a built-in magnetically operated reed switch is provided outside the control rod drive mechanism housing 12, and a scrum position detection magnet 28 and a screen detection magnet 29 are provided. Movement can be detected.
このように構成された制御棒駆動機構において、 電動機 1 8を回転駆動させる ことにより、 回転軸 1及び駆動軸 3を介してねじ軸 4が回転し、 このねじ軸 4の 回転によりナット 5が上下動する。 その際、 ナット 5はローラ 6を介して取付板 7により回転が規制されて上下動する。 ナット 5の上下動に連動して、 中空ビス トン 9及び制御棒 1 1が上下動し、 この制御棒 1 1の上下動により炉心への挿入 及び引抜き量が調整され、 炉出力がコントロールされる。 In the control rod drive mechanism configured as described above, by rotating the electric motor 18, the screw shaft 4 rotates via the rotation shaft 1 and the drive shaft 3, and the rotation of the screw shaft 4 causes the nut 5 to move up and down. Move. At that time, the rotation of the nut 5 is regulated by the mounting plate 7 via the roller 6 and moves up and down. The hollow screw 9 and the control rod 11 move up and down in conjunction with the up and down movement of the nut 5, and the up and down movement of the control rod 11 adjusts the amount of insertion and withdrawal into the core and controls the furnace power. .
スクラム時においては、 制御棒 1 1とカツプリング 1 0を介して結合した中空 ビストン 9が、 水圧制御ュニッ卜から供給される水圧により急速に押し上げられ ナット 5から分離し、 急速に制御棒 1 1を炉心に挿入する。 このとき、 中空ビス トン 9のナツト 5からの分離は分離検出プローブ 2 7により検出される。 また、 スクラム中、 及びスクラム後の制御棒 1 1の位置はスクラム位置検出プローブ 3 0により検出される。 During scram, the hollow piston 9 connected to the control rod 11 via the coupling 10 is quickly pushed up by the water pressure supplied from the water pressure control unit and is separated from the nut 5, and the control rod 11 is quickly removed. Insert into the core. At this time, the separation of the hollow bistone 9 from the nut 5 is detected by the separation detection probe 27. The positions of the control rods 11 during and after the scrum are detected by the scrum position detection probe 30.
また、 定検時に実施する制御棒摩擦測定試験の際は、 水圧制御ユニットに制御 棒摩擦測定試験装置を接続し、 前記試験装置を介して制御棒駆動装置に水圧を供 給することにより、 制御棒を炉心に挿入する。 この時の制御棒駆動機構の動作は 挿入速度が遅いことを除き、 スクラム時の動作と同様である。 制御棒摩擦測定試 験においては、 前記挿入時の水圧の変動を測定することにより、 制御棒と周囲機 器との摩擦状態を確証する。 In the control rod friction measurement test conducted at the time of regular inspection, control is performed by connecting a control rod friction measurement test device to the water pressure control unit and supplying water pressure to the control rod drive device via the test device. Insert the rod into the core. At this time, the operation of the control rod drive mechanism is the same as that of the scrum except that the insertion speed is low. In the control rod friction measurement test, the state of friction between the control rod and peripheral devices is confirmed by measuring the fluctuation of water pressure during the insertion.
以上に示す制御棒駆動機構ではスプールピース 1 4の軸封部としてグランドパ ッキン 2 3を有し、 また電動機 1 8としてインバー夕電源を用いるステヅプモ一 夕を採用しているが、 近年、 制御棒駆動機構について、 ( 1 ) 磁気継手 (マグネ ットカップリング) 採用によるスプールビース軸封部の削除、 および、 (2 ) 電 動機型式の変更 (誘導電動機化) 等の改良が検討されており、 これについては例 えば日本国特許公報特閧平 1 0— 1 3 2 9 9 7号及び特開平 1 0— 2 7 4 6 8 8 号に開示されている。 ところがこのような制御棒駆動機構においては、 下記の点 において技術の確立或いは更なる改良の余地がある。 The control rod drive mechanism described above has a gland packing 23 as a shaft seal for the spool piece 14 and a stepper motor using an invertor power supply as the motor 18. As for the mechanism, improvements such as (1) removal of the spool bead shaft seal by adopting a magnetic coupling (magnet coupling) and (2) change of motor type (induction motor) are being studied. For example, it is disclosed in Japanese Patent Publication No. 10-1332977 and Japanese Patent Application Laid-Open No. 10-274768. However, in such a control rod driving mechanism, there is room for establishing a technology or further improving the following points.
図 7に示す従来の電動制御棒駆動機構においては、 電動機としてステップモー 夕を採用しており、 電動機電源としてインバー夕電源を採用しているが、 システ
ムが複雑であり、 また電源物量も多いという問題がある。 このため現在検討が進 められている、 誘導電動機を採用した制御棒駆動機構においては、 電源システム の簡素化が求められている。 また、 誘導電動機を適用する場合の電源装置および 制御装置の最適化は未だなされておらず、 駆動性能の健全性を確認する手段につ いても未だ確立されていない。 The conventional electric control rod drive mechanism shown in Fig. 7 employs a stepping motor as the motor and an invertor power supply as the motor power supply. The problem is that the system is complicated and the amount of power supply is large. For this reason, the control rod drive mechanism using an induction motor, which is currently being studied, requires a simplified power supply system. In addition, optimization of the power supply unit and control unit when applying an induction motor has not yet been performed, and no means has been established to confirm the soundness of the drive performance.
また、 磁気継手を採用した制御棒駆動機構において、 磁気継手自体の構造、 仕 様検討がなされてきてはいるが、 保守、 試験手段については確立されていない。 また、 磁気継手が万一脱調した場合、 制御棒の実際の位置が不明となる可能性 がある。 このため、 この問題を解決するためのいくつかの手段が近年提案されて いるが、 システムが複雑であり現実的でなく、 合理的な検知手段の確立が求めら れている。 In addition, although the structure and specifications of the magnetic coupling itself have been studied for the control rod drive mechanism that employs a magnetic coupling, maintenance and testing methods have not been established. If the magnetic coupling loses synchronism, the actual position of the control rod may be unknown. For this reason, some means for solving this problem have been proposed in recent years, but the system is complicated and impractical, and it is required to establish a reasonable means of detection.
また、 磁気継手を水中で使用するにあたり、 万一磁気継手を覆う外被が損傷し た場合、 内蔵する磁石と水が接触し、 発鎬等により磁気継手性能が劣化する可能 性がある。 このため、 前記事象が発生した場合でも磁気継手の機能を確保する手 段の確立が望まれている。 In addition, when the magnetic joint is used underwater, if the jacket covering the magnetic joint is damaged, the built-in magnet may come into contact with water, and the magnetic joint performance may be degraded due to detonation. Therefore, it is desired to establish a means for ensuring the function of the magnetic coupling even when the above-mentioned event occurs.
また、 従来の制御棒摩擦測定試験においては、 個々の水圧制御ユニットへ制御 棒摩擦測定試験装置を現場で順次接続しながら実施する必要があり、 工程へのィ ンパク卜が大きく、 また前記接続作業は放射線管理区域内の作業であり、 作業性 向上、 被ばく低減の観点から、 より簡易な試験方法の確立が望まれている。 発明の要約 In addition, in the conventional control rod friction measurement test, it is necessary to perform the test while sequentially connecting the control rod friction measurement test equipment to each hydraulic pressure control unit at the site, which has a large impact on the process and the connection work. Is a work in a radiation control area, and it is desired to establish a simpler test method from the viewpoint of improving workability and reducing exposure. Summary of the Invention
本発明は上述した事情を鑑みてなされたもので、 制御棒駆動機構及び、 電源装 置及び制御装置といった関連系の確立、 保守、 試験手段の確立を行いつつ、 信頼 性の高い制御棒駆動機構を提供することを目的とする。 SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and establishes a control rod drive mechanism and related systems such as a power supply device and a control device, as well as maintenance means and test means, while providing a highly reliable control rod drive mechanism. The purpose is to provide.
本発明の第 1の観点によれば、 以下に示されるいずれかの特徴を具備した制御 棒駆動装置が提供される。 According to a first aspect of the present invention, there is provided a control rod driving device having any of the following features.
第 1の特徴は、 制御棒の駆動力発生源として従来の F M C R Dで用いていたィ ンバ一夕電源を用いたモー夕に代えて誘導電動機を用いること、 並びに誘導電動 機の o n— 0 f f を行うスィツチを多重化するとともに各スィツチを独立切替で
きるようにしたこと、 にある。 これにより電源及び制御装置の簡素化および最適 化を図ることができ、 また、 誤作動等による制御棒駆動を防止して信頼性向上を 図ることが可能である。 The first feature is that an induction motor is used as a control rod driving force source in place of the conventional motor-powered motor that uses an overnight power supply in the FMCRD. Switches to be multiplexed and each switch can be switched independently. What you can do is in As a result, the power supply and the control device can be simplified and optimized, and control rod drive due to malfunction or the like can be prevented to improve reliability.
第 2の特徴は、 制御棒の駆動力発生源として誘導電動機を用いるとともに、 制 御棒の位置検出に基づいて算出される制御棒の駆動速度を監視することにある。 誘導電動機は負荷に応じて回転速度が変動する。 制御棒駆動速度を測定すること により、 負荷変動等の制御棒駆動機構の状態変化を把握することができ、 状態に 応じて、 状態表示、 警報および駆動停止等といった適切な対応をとることが可能 となる。 A second feature resides in that an induction motor is used as a control rod driving force generation source, and the control rod drive speed calculated based on detection of the control rod position is monitored. The rotation speed of the induction motor fluctuates according to the load. By measuring the control rod drive speed, changes in the state of the control rod drive mechanism, such as load fluctuations, can be grasped.According to the state, it is possible to take appropriate measures such as status display, alarms, drive stop, etc. Becomes
第 3の特徴は、 制御棒駆動装置に制御棒の停止位置あるいは制御棒駆動距離を 測定する手段を設け、 測定された停止位置あるいは制御棒駆動距離と、 制御棒駆 動装置が健全な場合において想定される制御棒の停止位置あるいは制御棒駆動距 離とを比較することにある。 これにより、 制御棒駆動機構の負荷変動、 劣化等を 考慮して制御棒駆動機構が健全な駆動性能を有しているか確認することができ、 状態に応じて、 状態表示、 警報といった適切な対応をとることが可能となる。 第 4の特徴は、 制御棒駆動機構にブレーキを複数設け、 複数のブレーキをタイ ミングをずらして作動させることにある。 これにより、 1つのブレーキの負担を 低減することができる。 特に、 複数のブレーキを、 軸回転時に保持または制動動 作を行う制動用、 軸回転停止時に制動または保持動作を行う保持用として使い分 けることとすれば、 保持用に用いるブレーキの摩耗等による保持能力低下を防止 し、 軸回転停止時の保持能力、 すなわち制御棒位置保持能力に関して信頼性を向 上させることが可能となる。 The third feature is that the control rod drive is provided with means for measuring the control rod stop position or control rod drive distance, and the measured stop position or control rod drive distance and the control rod drive when the control rod drive is sound The purpose is to compare the assumed control rod stop position or control rod drive distance. As a result, it is possible to confirm whether the control rod drive mechanism has sound drive performance in consideration of load fluctuation, deterioration, etc. of the control rod drive mechanism, and to take appropriate measures such as status display and alarm according to the status Can be taken. The fourth feature is that a plurality of brakes are provided in the control rod drive mechanism, and the plurality of brakes are operated at different timings. As a result, the load on one brake can be reduced. In particular, if a plurality of brakes are used separately for braking for holding or braking when the shaft rotates, and for holding or braking when the shaft stops rotating, wear due to wear of the brake used for holding It is possible to prevent a decrease in the holding capacity and to improve the reliability with respect to the holding capacity when the shaft rotation is stopped, ie, the control rod position holding capacity.
第 5の特徴は、 制御棒駆動機構にブレーキを複数設け、 各ブレーキ単独での静 止時保持トルクを原子炉の通常運転時の制御棒の位置保持に必要なトルク以上に 設定したことにある。 このようにすれば、 万一 1個のブレーキが機能喪失したし ても、 確実に制御棒の位置保持を行うことができ、 信頼性を向上させることがで きる。 The fifth feature is that multiple brakes are provided in the control rod drive mechanism, and the holding torque at standstill of each brake alone is set to be higher than the torque required to maintain the control rod position during normal operation of the reactor. . In this way, even if one brake loses its function, the position of the control rod can be reliably maintained, and the reliability can be improved.
第 6の特徴は、 電動機から制御棒への駆動力伝達経路に磁気継手が設けられた 制御棒駆動機構において、 磁気継手に関して電動機側の部材および制御棒側の部
材の回転位置をそれそれ検出する手段を設けたことにある。 このようにすれば、 万一磁気継手が脱調した場合でも、 両回転位置を比較することにより、 それを検 知することが可能となり、 その状態にに応じて、 状態表示、 警報、 駆動停止とい つた適切な対応をとることが可能となる。 A sixth feature is that in a control rod drive mechanism in which a magnetic coupling is provided in a driving force transmission path from the electric motor to the control rod, a member on the motor side and a part on the control rod side with respect to the magnetic coupling. There is provided means for detecting the rotational position of the material. In this way, even if the magnetic coupling loses synchronism, it is possible to detect it by comparing the two rotational positions, and according to the state, display the status, alarm, and stop the drive. It is possible to take appropriate measures.
本発明の第 2の観点によれば、 制御棒の駆動源として誘導電動機を用いた制御 棒駆動装置の試験方法において、 制御棒の駆動を行う際に制御棒の移動速度を検 出し、 または、 誘導電動機に供給される電流、 電圧または電力を検出し、 これら 検出値の絶対値または変動により制御棒および駆動機構とその周囲の部材との摩 擦を測定することを特徴とする制御棒駆動装置の試験方法が提供される。 According to a second aspect of the present invention, in a test method of a control rod drive device using an induction motor as a drive source of the control rod, a moving speed of the control rod is detected when driving the control rod, or A control rod drive device characterized by detecting current, voltage or power supplied to an induction motor, and measuring the friction between the control rod and the drive mechanism and its surrounding members based on the absolute value or fluctuation of the detected value. Is provided.
誘導電動機は負荷に応じて回転速度が変動する。 また、 誘導電動機の負荷が変 動した場合には、 誘導電動機への電気エネルギーの供給状態が変化する。 従って 制御棒駆動速度または誘導電動機への供給エネルギーの絶対値あるいはその変動 を測定することにより、 制御棒摩擦等の負荷変動を確認することができる。 沸騰 水型原子力発電プラントの定期点検時には制御棒摩擦測定を行っているが、 上述 の方法で測定を行うことにより、 作業が簡易となり作業工程が短縮できるだけで なく、 本作業を中央制御室等の放射線管理区域外で実施可能となり、 作業性向上、 被ばく低減を図ることが可能となる。 The rotation speed of the induction motor fluctuates according to the load. Also, when the load of the induction motor changes, the state of supply of electric energy to the induction motor changes. Therefore, by measuring the control rod drive speed or the absolute value of the energy supplied to the induction motor or its fluctuation, it is possible to confirm the load fluctuation such as control rod friction. Control rod friction measurement is performed during periodic inspections of boiling water nuclear power plants, but by performing measurement using the method described above, the work can be simplified and the work process can be shortened. It can be implemented outside the radiation control area, and it will be possible to improve workability and reduce exposure.
本発明の第 3の観点によれば、 電動機を含む電動機アセンブリと、 スプールピ ースと、 スプールビースにより隔てられた一対の継手要素を有する磁気継手と、 を有する駆動機構を含む制御棒駆動装置に適用可能であり、 スプールビースを駆 動機構に取り付けた状態のままで磁気継手の健全性の確認が可能な、 新規な試験 装置および試験方法が提供される。 According to a third aspect of the present invention, there is provided a control rod drive device including a drive mechanism including: a motor assembly including a motor; a spool joint; and a magnetic joint having a pair of joint elements separated by a spool bead. A novel test apparatus and a new test method that can be applied and that can check the integrity of a magnetic coupling while a spool bead is attached to a drive mechanism are provided.
試験装置は、 スプールビースを前記駆動機構に取り付けた状態で、 前記磁気継 手を構成する前記電動機アセンブリ側の継手要素またはこの継手要素に接続され た軸に対してトルクを印加可能なトルク印加手段と、 印加されたトルクを測定す るトルク測定手段とを含む。 The test apparatus includes a torque applying means capable of applying a torque to a joint element on the motor assembly side or a shaft connected to the joint element, which constitutes the magnetic joint, with the spool bead attached to the drive mechanism. And torque measuring means for measuring the applied torque.
試験方法は、 駆動機構が、 電動機が発生した回転運動を直線運動に変換するボ ボールねじ機構を有する場合に適用可能なものであり、 この方法は、 スプールピ —スを駆動機構に取り付けた状態で、 ボールねじ機構を構成するナツトの位置を
機械的最下限状態または機械的最上限状態とし、 磁気継手を構成する電動機ァセ ンブリ側の継手要素またはこの継手要素に接続された軸に対してトルクを印加し て、 磁気継手の異常の有無を判断することを特徴としている。 なお、 この場合、 電動機ァセンブリを駆動機構に取り付けた状態で、 電動機ァセンブリの下部から 電動機アセンブリの軸を回転させ、 電動機アセンブリの軸を介して電動機ァセン プリ側の継手要素またはこの継手要素に接続された軸に対してトルクを印加する ことが好適である。 The test method is applicable when the drive mechanism has a ball screw mechanism that converts the rotary motion generated by the motor into a linear motion. This method is applicable when the spool piece is attached to the drive mechanism. The positions of the nuts that make up the ball screw mechanism Set the mechanical lower limit state or the mechanical upper limit state, and apply torque to the joint element on the motor assembly side that constitutes the magnetic coupling or the shaft connected to this coupling element, and check if there is any abnormality in the magnetic coupling. Is determined. In this case, while the motor assembly is mounted on the drive mechanism, the shaft of the motor assembly is rotated from the lower portion of the motor assembly, and connected to the joint element on the motor assembly side or this joint element via the shaft of the motor assembly. It is preferable to apply a torque to the bent shaft.
上記試験装置および試験方法によれば、 磁気継手の健全性確認を目的としてス プールピースを取外す必要がなくなり、 プラント定検時の作業量、 工程、 被ばく 量の低減が可能となる。 According to the above-described test apparatus and test method, it is not necessary to remove the spur piece for the purpose of confirming the soundness of the magnetic coupling, and it is possible to reduce the amount of work, processes, and exposure at the time of regular plant inspection.
本発明の第 4の観点によれば、 電動機を含む電動機アセンブリと、 スプールピ ースと、 スプールピースにより隔てられた一対の継手要素を有する磁気継手と、 を有する駆動機構を含む制御棒駆動装置に適用可能であり、 スプールピースを駆 動機構に取り付けた状態のままで磁気継手およびスプールピースの健全性を確認 可能な、 新規な試験装置が提供される。 According to a fourth aspect of the present invention, there is provided a control rod drive device including a drive mechanism including: a motor assembly including a motor; a spool piece; and a magnetic coupling having a pair of coupling elements separated by a spool piece. A new test apparatus is provided which is applicable and can check the integrity of the magnetic coupling and the spool piece while the spool piece is attached to the drive mechanism.
この試験装置は、 磁気継手を構成する制御棒側の継手要素またはこの継手要素 に接続された軸に接続可能であって、 制御棒側の継手要素またはこの継手要素に 接続された軸の回転を拘束する回転拘束手段と、 磁気継手を構成する電動機ァセ ンブリ側の継手要素またはこの継手要素に接続された軸に接続可能であって、 電 動機アセンブリ側の継手要素またはこの継手要素に接続された軸にトルクを印加 するトルク印加手段とを含む。 This test device can be connected to the joint element on the control rod side or the shaft connected to this joint element that constitutes the magnetic joint, and controls the rotation of the joint element on the control rod side or the shaft connected to this joint element. A rotation restricting means for restricting, a coupling element on a motor assembly side constituting a magnetic coupling or a shaft connected to the coupling element, the coupling element being connected to the coupling element on the motor assembly or the coupling element; Torque applying means for applying torque to the shaft.
別の態様において、 試験装置は、 磁気継手を構成する制御棒側の継手要素また はこの継手要素に接続された軸に接続可能であって、 制御棒側の継手要素または この継手要素に接続された軸にトルクを印加するトルク印加手段と、 磁気継手を 構成する電動機アセンブリ側の継手要素またはこの継手要素に接続された軸に接 続可能であって、 電動機ァセンブリ側の継手要素またはこの継手要素に接続され た軸の回転を拘束する回転拘束手段とを含む。 In another embodiment, the test apparatus is connectable to a control rod-side coupling element or a shaft connected to the control rod-side coupling element constituting the magnetic coupling, and is connected to the control rod-side coupling element or to this coupling element. Torque applying means for applying torque to the shaft, and a coupling element on the motor assembly side or a shaft connected to the coupling element which constitutes a magnetic coupling, and a coupling element on the motor assembly side or this coupling element. Rotation restricting means for restricting rotation of the shaft connected to the shaft.
試験装置は、 制御棒側の継手要素若しくはこの継手要素に接続された軸、 また は電動機アセンブリ側の継手要素若しくはこの継手要素に接続された軸の一方に
接続可能であって、 トルク印加手段により印加されるトルクを制限するトルク制 限器を更に備えて構成することができる。 The test equipment shall be connected to one of the coupling element on the control rod side or the shaft connected to this coupling element, or the coupling element on the motor assembly side or the shaft connected to this coupling element. It can be configured to further include a torque limiter that is connectable and that limits the torque applied by the torque applying means.
試験装置は、 制御棒側の継手要素若しくはこの継手要素に接続された軸、 また は電動機ァセンブリ側の継手要素若しくはこの継手要素に接続された軸の一方に 接続可能であって、 制御棒側の継手要素またはこの継手要素に接続された軸また は電動機アセンブリ側の継手要素またはこの継手要素に接続された軸の回転角度 を測定する回転角測定手段を更に備えて構成することもできる。 The test device can be connected to one of the joint element on the control rod side or the shaft connected to this joint element, or the joint element on the motor assembly side or the shaft connected to this joint element, and It may be further provided with a rotation angle measuring means for measuring a rotation angle of the joint element, a shaft connected to the joint element or a joint element on the motor assembly side or a shaft connected to the joint element.
このようにすれば、 スプールビースを取外した場合において、 磁気継手部の伝 達トルクを測定することにより、 磁気継手部の健全性確認が可能となる。 スプー ルピースを取外す場合は、 格納容器外の作業環境のよい場所で試験実施可能であ り、 作業性の改善、 被ばく低減が可能となる。 In this way, when the spool bead is removed, the soundness of the magnetic coupling can be checked by measuring the transmission torque of the magnetic coupling. When the spool piece is removed, the test can be performed in a place with a good working environment outside the PCV, and workability can be improved and exposure can be reduced.
試験装置は、 スプールピースの内部を加圧する圧力供給手段と、 スプールビー スの内部の圧力を測定する圧力測定手段と、 を更に備えて構成することもできる これによれば、 スプールビースを取外した場合に、 スプールビース隔壁内側部を 加圧することにより、 耐圧試験を実施することができる。 The test apparatus may further include pressure supply means for pressurizing the inside of the spool piece, and pressure measurement means for measuring the pressure inside the spool bead. According to this, the spool bead is removed. In this case, a pressure test can be performed by pressing the inside of the spool bead partition wall.
本発明の第 5の観点によれば、 電動機を含む電動機アセンブリと、 スプールビ ースと、 スプールピースにより隔てられた一対の継手要素を有する磁気継手と、 を有するとともに、 電動機が発生した駆動力を磁気継手を介して制御棒に伝達し て制御棒を昇降させる駆動機構を含む制御棒駆動装置の点検装置が提供される。 この点検装置は、 磁気継手を構成する一方の継手要素またはこの継手要素に接続 された軸の位置を径方向に関して固定する第 1の径方向位置固定手段と、 磁気継 手を構成する他方の継手要素またはこの継手要素に接続された軸の位置を径方向 に関して固定する第 2の径方向位置固定手段とを含んで構成される。 この点検装 置を用いて、 スプールピース及び各継手要素の軸線を固定した状態で、 スプール ピースの分解あるいは組立が行われる。 According to a fifth aspect of the present invention, there is provided an electric motor assembly including an electric motor, a spool bush, and a magnetic coupling having a pair of coupling elements separated by a spool piece, and a driving force generated by the electric motor. An inspection device for a control rod drive device including a drive mechanism for transmitting the control rod to a control rod via a magnetic coupling to raise and lower the control rod is provided. This inspection device includes a first radial position fixing means for fixing the position of one of the joint elements constituting the magnetic joint or a shaft connected to the joint element in the radial direction, and the other joint constituting the magnetic joint. Second radial position fixing means for fixing the position of the element or the shaft connected to the joint element in the radial direction. Using this inspection device, the spool piece is disassembled or assembled with the axis of the spool piece and each joint element fixed.
磁気継手は強力な磁石を内蔵しているため、 軸線を固定していない状態で分解 /組立を行うと、 内側と外側磁気継手あるいは磁気継手と周囲の磁性体の引き合 う力により、 磁気継手がスプールビース隔壁部等にあたり、 磁気継手破損等をひ きおこす可能性がある。 軸線を固定した状態で内側磁気継手と外側磁気継手の分
解/組立を行うことにより、 機器の損傷を防止し安全に分解/組立作業の実施が 可能となる。 Since the magnetic joint has a strong magnet built in, if disassembly / assembly is performed with the axis not fixed, the magnetic joint will be pulled by the force that attracts the inner and outer magnetic joints or the magnetic joint and the surrounding magnetic material. May hit the spool bead bulkhead, etc., and cause damage to the magnetic joint. With the axis fixed, the inner magnetic joint and the outer magnetic joint By performing disassembly / assembly, it is possible to prevent damage to the equipment and safely perform disassembly / assembly.
本発明の第 6の観点によれば、 制御棒駆動装置に用いるに好適な新規なトルク 伝達装置が提供される。 このトルク伝達装置は、 複数の磁石を内蔵するとともに 第 1の軸に接続された第 1の継手要素と、 複数の磁石を内蔵するとともに第 2の 軸に接続された第 2の継手要素と、 を含む磁気継手を有するトルク伝達装置であ つて、 前記第 1の継手要素の全ての磁石を水密または気密に覆う第 1の外被と、 前記第 2の継手要素の全ての磁石を水密または気密に覆う第 2の外被と、 を備え、 更に、 前記第 1の外被の内側において前記第 1の継手要素に内蔵された磁石の一 部若しくは全部を水密または気密に覆う第 3の外被と、 前記第 2の外被の内側に おいて前記第 2の継手要素に内蔵された磁石の一部あるいは全部を水密または気 密に覆う第 4の外被と、 のうち少なくともいずれか一方を備えたことを特徴とし ている。 According to a sixth aspect of the present invention, there is provided a novel torque transmission device suitable for use in a control rod drive device. The torque transmission device includes a first coupling element that includes a plurality of magnets and is connected to a first shaft, a second coupling element that includes a plurality of magnets and is connected to a second shaft, A torque transmission device having a magnetic coupling including: a first jacket that water-tightly or air-tightly covers all magnets of the first joint element; and a water-tight or air-tight seal that covers all magnets of the second joint element. And a third jacket that water-tightly or air-tightly covers part or all of a magnet built in the first joint element inside the first jacket. And at least one of a fourth jacket that water-tightly or air-tightly covers part or all of the magnets built in the second joint element inside the second jacket. It is characterized by having.
水中環境等では磁石と水が接触し、 腐食の発生により磁気特性が変化すること を防止するため、 磁気継手表面を外被で覆う構成が用いられるが、 内側/外側磁 気継手表面を覆う外被の内側に、 さらに外被で覆った磁石磁石を設置することに より、 万一内側/外側磁気継手表面を覆う外被が破損した場合でも、 磁石と水の 接触を防止し、 磁石の健全性を確保することが可能である。 これにより磁気継手 の信頼性が向上する。 In an underwater environment, etc., in order to prevent magnets from coming into contact with water and changing magnetic properties due to corrosion, a configuration is used in which the surface of the magnetic joint is covered with a jacket. By installing a magnet magnet covered with a jacket inside the jacket, even if the jacket covering the inside / outside magnetic joint surface is broken, the magnet can be prevented from coming into contact with water and the magnet sound. It is possible to secure the property. This improves the reliability of the magnetic coupling.
なお、 このトルク伝達装置を制御棒駆動装置に適用する場合には、 スプールビ —ス隔壁内部にトルク伝達装置の第 1の継手要素が設置され、 スプールビース隔 壁外部にトルク伝達装置の第 2の継手要素が設置されるように構成するとともに、 前記第 1の継手要素のうち第 3の外被に覆われた磁石が機能し、 前記第 1の継手 要素の第 3の外被に覆われていない磁石が機能しない状態において、 原子炉の通 常運転時の制御棒位置保持に必要なトルク以上の最大伝達トルクをトルク伝達装 置が有するように構成することが好適である。 このようにすれば、 磁気継手を用 いた信頼性の高い制御棒駆動機構を構築することが可能である。
図面の簡単な説明 When this torque transmission device is applied to a control rod driving device, the first coupling element of the torque transmission device is installed inside the spool rib partition, and the second coupling element of the torque transmission device is installed outside the spool bead partition wall. The joint element is configured to be installed, and the magnet covered by the third jacket of the first joint element functions, and the magnet is covered by the third jacket of the first joint element. It is preferable that the torque transmission device be configured so that the torque transmission device has a maximum transmission torque greater than or equal to the torque required to maintain the control rod position during normal operation of the nuclear reactor in a state where the magnet does not function. In this way, a highly reliable control rod drive mechanism using a magnetic coupling can be constructed. BRIEF DESCRIPTION OF THE FIGURES
図 1は、 本発明の第 1の実施形態を説明する図であって、 本発明による制御棒 駆動装置の一実施形態を概略的に示す軸線方向に沿った断面図、 FIG. 1 is a diagram illustrating a first embodiment of the present invention, and is a cross-sectional view along an axial direction schematically illustrating an embodiment of a control rod driving device according to the present invention.
図 2は、 図 1に示す磁気継手の構成を説明する概念図、 FIG. 2 is a conceptual diagram illustrating the configuration of the magnetic coupling shown in FIG. 1,
図 3は、 本発明の第 2の実施形態を説明する図であって、 磁気継手の検査方法 およびそのための装置を説明する概略図、 FIG. 3 is a diagram illustrating a second embodiment of the present invention, and is a schematic diagram illustrating an inspection method of a magnetic coupling and an apparatus therefor,
図 4は、 磁気継手のトルク特性の一例を説明するグラフ、 FIG. 4 is a graph illustrating an example of a torque characteristic of a magnetic joint.
図 5は、 本発明の第 3の実施形態を説明する図であって、 スプールビース試験 装置を示す概略図、 FIG. 5 is a diagram illustrating a third embodiment of the present invention, and is a schematic diagram showing a spool bead test device,
図 6は、 本発明の第 4の実施形態を説明する図であって、 スプールビース点検 装置を示す概略図、 そして FIG. 6 is a view for explaining a fourth embodiment of the present invention, and is a schematic view showing a spool bead inspection device, and
図 7は、 従来の制御棒駆動装置を概略的に示す軸線方向に沿つた断面図、 である。 好適な実施形態の説明 FIG. 7 is a cross-sectional view along the axial direction schematically showing a conventional control rod driving device. Description of the preferred embodiment
以下に図面を参照して本発明の好適な実施形態について説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
第 1の実施形態 First embodiment
まず、 図 1及び図 2を参照して第 1の実施形態について説明する。 図 1には、 第 1の実施形態に係る制御棒駆動機構の下部構造、 すなわちスプールビース部と 電動機アセンブリ部の構造が模式的に表わされている。 なお、 スプールビース 1 4より上部の構造は、 図 7を参照して説明した従来技術のものと同一であり、 当 該部分を構成する部材については図 7と同一の符号を付し、 重複説明は省略する c また、 下部構造についても、 図 7で説明した部材と同一または類似の部材につい ては、 図 7と同一の符号を付し、 重複説明は省略する。 First, a first embodiment will be described with reference to FIGS. FIG. 1 schematically shows a lower structure of the control rod drive mechanism according to the first embodiment, that is, a structure of a spool bead portion and an electric motor assembly portion. The structure above the spool bead 14 is the same as that of the prior art described with reference to FIG. 7, and the same reference numerals as in FIG. Are omitted. C Also, regarding the lower structure, members that are the same as or similar to the members described in FIG. 7 are denoted by the same reference numerals as those in FIG. 7, and redundant description is omitted.
まず、 本実施形態に係る制御棒駆動機構の構成を以下に説明する。 First, the configuration of the control rod driving mechanism according to the present embodiment will be described below.
図 1に示す制御棒駆動機構は、 スプールピース 1 4隔壁により隔てられた内側 磁気継手要素 3 1と外側磁気継手要素 3 2とから構成される磁気継手、 分離検出 マグネット 2 5、 駆動軸 3等を有している。 The control rod drive mechanism shown in Fig. 1 is composed of a magnetic joint composed of an inner magnetic coupling element 31 and an outer magnetic coupling element 32 separated by a spool piece 14, a partition, a separation detection magnet 25, a drive shaft 3, etc. have.
また制御棒駆動機構の上部構造内には、 ボールねじ機構を構成するねじ軸 4及
びナット 5と、 中空ピス トン 9と、 スクラム位置検出マグネッ ト 2 8と、 フルイ ン検出マグネッ ト 2 9等が設けられている。 In addition, the screw shaft 4 and the And a nut 5, a hollow piston 9, a scrum position detecting magnet 28, a fullin detecting magnet 29, and the like.
スプールビース 1 4下部には電動機アセンブリが設けられており、 スプールビ —ス 1 4側の外側磁気継手 3 2と電動機ァセンブリ側の回転軸 1は力ップリング 2を介して結合されている。 An electric motor assembly is provided below the spool bead 14, and an outer magnetic coupling 32 on the spool bead 14 side and a rotating shaft 1 on the electric motor assembly side are connected via a force coupling 2.
電動機アセンブリは、 保持用ブレーキ 1 9と、 位置検出装置 (シンクロ位置レ ゾルバ) 2 0と、 変速機 3 3と、 制動用ブレーキ 3 4が付属した誘導電動機 3 5 と、 から構成されている。 保持用ブレーキ 1 9及び制動用ブレーキ 3 4は原子炉 の通常時における制御棒位置保持に必要なトルクとして、 両者ともそれそれ単独 でねじ軸 4の軸換算で 0 . 3 k g f m以上の静止時保持トルクを有している。 このように保持用ブレーキ 1 9及び制動用ブレーキ 3 4両者ともに、 静止時保 持トルクを通常運転時の制御棒位置保持に必要なトルクに設定していることによ り、 万一の一方のブレーキ機能喪失を考慮しても、 確実に制御棒位置保持が可能 であり、 信頼性の高い制御棒駆動機構を構築できる。 The motor assembly includes a holding brake 19, a position detection device (sync position resolver) 20, a transmission 33, and an induction motor 35 with a braking brake 34 attached. The holding brakes 19 and the braking brakes 34 are the torques required to maintain the control rod position during normal operation of the reactor. Has torque. As described above, both the holding brakes 19 and the braking brakes 34 set the holding torque at rest to the torque required to maintain the control rod position during normal operation. Even if the brake function is lost, the control rod position can be reliably maintained, and a highly reliable control rod drive mechanism can be constructed.
また外側磁気継手要素 3 2とスプールビース 1 4の隔壁との間と、 誘導電動機 3 5巻線部には、 それそれ温度計 3 6、 3 7が設置されている。 なお、 温度計 3 6は外側磁気継手要素 3 2の外周面近傍に配置してもよいし、 また、 温度計 3 7 は、 誘導電動機 3 5卷線部の近傍位置ゃケーシング内の適当な位置に配置しても よい。 Further, thermometers 36 and 37 are provided between the outer magnetic coupling element 32 and the partition wall of the spool bead 14 and the winding of the induction motor 35. The thermometer 36 may be arranged near the outer peripheral surface of the outer magnetic coupling element 32, and the thermometer 37 is positioned near the winding of the induction motor 35 卷 at an appropriate position in the casing. May be placed at
スプールビース 1 4外部には、 分離検出プローブ 2 7及びスクラム位置検出プ ローブ 3 0が設けられており、 これらプローブ 2 7、 3 0は、 それそれ磁気で作 動するリードスィッチを有している。 A separation detection probe 27 and a scrum position detection probe 30 are provided outside the spool bead 14.These probes 27 and 30 each have a magnetically operated lead switch. .
スクラム位置検出プローブ 3 0のリードスィッチ (図示せず) は上下方向に関 して複数配設され、 制御棒のフルス トロークに対し、 0 , 1 0, 4 0 , 6 0, 1 0 0 % ( 0 %が全引き抜き、 1 0 0 %が全挿入状態を意味する) 相当位置を検出 することが可能である。 また分離検出プローブ 2 7は、 分離検出マグネット 2 5 の位置を検知する分離検出リードスィッチ 3 8と、 磁気継手近傍の磁場状態を検 知する磁気継手脱調検知用リードスィツチ 3 9を有している。 A plurality of reed switches (not shown) of the scrum position detection probe 30 are arranged in the vertical direction, and 0, 10, 40, 60, 100% ( (0% means full extraction, 100% means full insertion state) It is possible to detect the corresponding position. The separation detection probe 27 has a separation detection lead switch 38 for detecting the position of the separation detection magnet 25 and a magnetic joint out-of-step detection lead switch 39 for detecting the magnetic field state near the magnetic joint. I have.
誘導電動機 3 5には電動機電源装置 4 1が接続されている。 電動機電源装置 4
1には例えば 6 O H zの固定周波数電源 4 4が接続されている。 また、 固定周波 数電源 4 4とは別に可変周波数電源 4 5も設けられており、 固定周波数電源 4 4 および可変周波数電源 4 5は、 いずれか一方を選択的に電動機電源装置 4 1に接 続することができる。 可変周波数電源 4 5は、 ステップ式に周波数を変更できる ものであってもよく、 連続的に周波数を変更できるものであってもよい。 An electric motor power supply 41 is connected to the induction motor 35. Motor power supply 4 1 is connected to a fixed frequency power supply 44 of, for example, 6 OHz. Also, a variable frequency power supply 45 is provided separately from the fixed frequency power supply 44, and either the fixed frequency power supply 44 or the variable frequency power supply 45 is selectively connected to the motor power supply 41. can do. The variable frequency power supply 45 may be a type capable of changing the frequency in a stepped manner or a type capable of continuously changing the frequency.
誘導電動機 3 5は、 同期回転数が電源周波数に比例し、 また負荷によっても回 転数が変動する。 本実施例では電動機電源として複数の周波数を選択可能として おり、 原子炉運転中において中速駆動、 原子炉停止中においては駆動時間短縮の ため高速駆動、 原子炉停止時におけるプラント点検時に実施する制御棒摩擦測定 試験時においては低速駆動といった、 状況に応じてフレキシビリティの高い運用 が可能となっている。 In the induction motor 35, the synchronous rotation speed is proportional to the power supply frequency, and the rotation speed also varies depending on the load. In this embodiment, multiple frequencies can be selected as the motor power supply.Medium-speed drive during reactor operation, high-speed drive to reduce drive time when the reactor is stopped, and control implemented during plant inspection when the reactor is stopped During the bar friction measurement test, highly flexible operation is possible depending on the situation, such as low-speed drive.
特に制御棒摩擦測定試験時においては、 制御棒を全引き抜き状態から全挿入状 態へ低速駆動し、 駆動速度を測定することにより摩擦等の負荷変動を検出するこ とができる。 制御棒摩擦測定試験等においては、 低速で駆動するほうが短期間の 負荷変動等まで明確に検出することが可能であり、 信頼性の高い試験となる。 も ちろん原子炉運転中と同様に中速駆動において問題なく短期間の負荷変動等を確 認可能な場合は、 中速駆動にて試験を制御棒摩擦測定試験を実施することも可能 である。 In particular, during the control rod friction measurement test, it is possible to detect load fluctuations such as friction by driving the control rod at a low speed from the fully pulled state to the fully inserted state and measuring the drive speed. In a control rod friction measurement test, etc., driving at a low speed makes it possible to clearly detect short-term load fluctuations, etc., and it is a highly reliable test. Of course, if it is possible to confirm short-term load fluctuations etc. without any problems at medium speed drive as during reactor operation, it is also possible to conduct control rod friction measurement test at medium speed drive .
また、 誘導電動機 3 5の負荷が変動した場合には、 誘導電動機 3 5への電気工 ネルギ一の供給が変化するため、 電源装置 4 1に電流計、 電圧計または電力計等 を設置し、 これら電流計等の検出値を確認することによつても、 制御棒摩擦測定 試験を実施することが可能である。 In addition, when the load of the induction motor 35 fluctuates, the supply of electric energy to the induction motor 35 changes, so an ammeter, voltmeter, or wattmeter is installed in the power supply unit 41, The control rod friction measurement test can also be performed by confirming the detected values of these ammeters.
また、 本実施形態においては、 6 0 H zの固定周波数電源 4 4と可変周波数電 源 4 5を個別に設けているため、 原子炉運転中は固定周波数電源 4 4に接続、 原 子炉停止中は必要に応じ可変周波数電源 4 5に接続するように運用することによ り、 原子炉運転中に誤った電源に接続する可能性を排除し、 信頼性の高い運用が 可能である。 In the present embodiment, since the fixed frequency power supply 44 and the variable frequency power supply 45 of 60 Hz are separately provided, the reactor is connected to the fixed frequency power supply 44 during reactor operation, and the reactor is stopped. During operation, it is possible to connect to the variable frequency power supply 45 as necessary, thereby eliminating the possibility of connecting to the wrong power supply during the operation of the reactor, enabling highly reliable operation.
なお、 本実施形態では複数種の周波数を選択可能としているが、 互いに異なる 複数種の電圧を選択可能としても駆動速度をかえて駆動することが可能である。
この場合には、 固定周波数電源 4 4および可変周波数電源 4 5に代えて、 固定電 圧電源 4 4および可変電圧電源 4 5を設ければよい。 In this embodiment, a plurality of types of frequencies can be selected. However, even if a plurality of types of voltages different from each other can be selected, it is possible to drive with different driving speeds. In this case, fixed voltage power supply 44 and variable voltage power supply 45 may be provided instead of fixed frequency power supply 44 and variable frequency power supply 45.
再度図 1を参照すると、 電動機電源装置 4 1は、 直列に接続された 2つのスィ ツチ 4 0、 4 0を有している。 各スィッチ 4 0は、 制御装置 4 2から互いに別系 統の指令信号伝達経路を介して送信される信号により、 それそれを独立して制御 可能である。 また電動機電源装置 4 1には保護継電器としてサーマルリレー 4 3 が付設されている。 誘導電動機 3 5の負荷トルクが増大した場合には、 誘導電動 機 3 5に供給される駆動電流値が増大し、 サーマルリレー 4 3が作動するように なっている。 なお、 保護継電器はサーマルリレー 4 3に限定されるものではなく、 他の保護継電器を用いてもよい。 Referring again to FIG. 1, the motor power supply device 41 has two switches 40, 40 connected in series. Each of the switches 40 can be independently controlled by a signal transmitted from the control device 42 via a command signal transmission path that is separate from each other. The motor power supply 41 is provided with a thermal relay 43 as a protective relay. When the load torque of the induction motor 35 increases, the drive current value supplied to the induction motor 35 increases, and the thermal relay 43 operates. Note that the protection relay is not limited to the thermal relay 43, and another protection relay may be used.
また、 保持用ブレーキ 1 9にも、 保持用ブレーキ電源装置 4 6が接続されてい る。 電源装置 4 6には、 図示しない固定周波数電源が接続されている。 保持用ブ レーキ電源装置 4 6も、 直列に接続された 2つのスィッチ 4 7、 4 7を有してい る。 各スィッチ 4 7も、 制御装置 4 2から互いに別系統の指令信号伝達経路を介 して送信される信号により、 それそれを独立して制御可能である。 The holding brake power supply device 46 is also connected to the holding brake 19. A fixed frequency power supply (not shown) is connected to the power supply 46. The holding brake power supply 46 also has two switches 47, 47 connected in series. Each of the switches 47 can also be independently controlled by a signal transmitted from the control device 42 through a command signal transmission path of a different system.
このように電動機電源装置 4 1及び保持用ブレーキ電源装置 4 6にそれそれ直 列に 2つのスィッチ 4 0、 4 7を設置することにより、 単一故障等による制御棒 の誤駆動動作を防止可能であり、 信頼性が向上する。 By installing the two switches 40 and 47 in series with the motor power supply 41 and the holding brake power supply 46 in this way, it is possible to prevent erroneous operation of the control rod due to a single failure or the like. And the reliability is improved.
なお、 上記のスイッチ 4 0、 4 7は、 接点であってもよいし、 半導体スィッチ であってもよい。 The switches 40 and 47 may be contacts or semiconductor switches.
次に、 図 2を参照して磁気継手部の構成について詳細に説明する。 磁気継手を 構成する内側磁気継手要素 3 1は 8極の磁石 5 0、 5 1を内蔵しており、 また、 磁気継手を構成する外側磁気継手要素 3 2も同様に、 8極の磁石 4 8、 4 9を内 蔵している。 また、 磁石 4 8、 4 9、 5 0、 5 1はそれそれ、 磁気回路 5 2を構 成するための磁性体からなるヨーク 5 3、 5 4、 5 5、 5 6を有している。 Next, the configuration of the magnetic coupling part will be described in detail with reference to FIG. The inner magnetic coupling element 3 1 that forms the magnetic coupling incorporates 8-pole magnets 50 and 51, and the outer magnetic coupling element 3 2 that forms the magnetic coupling also has an 8-pole magnet 4 8 , 49. Each of the magnets 48, 49, 50, 51 has a yoke 53, 54, 55, 56 made of a magnetic material for forming a magnetic circuit 52.
外側磁気継手要素 3 2の磁石 4 8、 4 9の内表面は、 スリーブ 5 7により覆わ れ密閉されており、 内側磁気継手要素 3 1の磁石 5 0、 5 1の外表面は、 スリー ブ 5 7により覆われ密閉されている。 内側及び外側磁気継手要素 3 1、 3 2は、 各磁石 4 8、 4 9、 5 0、 5 1の磁力により磁気的に結合している。 このため、
スプールピース 1 4の隔壁部を介して非接触で内側および外側磁気継手要素 3 1、 3 2間で動力を伝達可能である。 The inner surfaces of the magnets 48, 49 of the outer magnetic coupling element 3 2 are covered and sealed by a sleeve 57, and the outer surfaces of the magnets 50, 51 of the inner magnetic coupling element 31 are sleeve 5 Covered and sealed by 7. The inner and outer magnetic coupling elements 31, 32 are magnetically coupled by the magnetic force of each magnet 48, 49, 50, 51. For this reason, Power can be transmitted between the inner and outer magnetic coupling elements 31 and 32 in a non-contact manner through the partition wall of the spool piece 14.
図 2 ( a ) に示すように、 外側磁気継手要素 3 2の符号 Aを付した磁石 5 1 As shown in Fig. 2 (a), the magnet 5 1
(以下 「磁石 A」 という) は、 符号 Bを付した他の磁石 4 9 (以下 「磁石 B」 と いう) より小型の磁石となっている。 また、 内側磁気継手要素 3 1の符号 Cを付 した磁石 5 0 (以下 「磁石 C」 という) は、 符号 Dを付した他の磁石 5 1 (以下(Hereinafter referred to as “magnet A”) is a smaller magnet than the other magnets 49 (hereinafter referred to as “magnet B”). Also, the magnet 50 (hereinafter, referred to as “magnet C”) with the symbol C of the inner magnetic coupling element 31 is the other magnet 51 (hereinafter, “magnet C”) with the symbol D.
「磁石 D」 という) より小型の磁石となっている。 It is a smaller magnet.
また、 外側磁気継手要素 3 2の磁石 Aに接する符号 Aを付したヨーク (以下 In addition, a yoke (hereinafter referred to as “Y”) that is in contact with magnet A of outer magnetic coupling element 32
「ヨーク A」 という) は、 符号 Bを付したヨーク (以下 「ヨーク B」 という) と 比較して小型となっている。 また。 内側磁気継手要素 3 1の符号 Cを付した磁石 に接する符号 Cを付したヨーク (以下 「ヨーク C」 という) は、 符号 Dを付した ヨーク (以下 「ヨーク D」 という) と比較して小型となっている。 ただし、 ョ一 ク Aとヨーク Bとを一体成形とし、 ヨーク Cとヨーク Dとを一体成形としても構 わない。 The "yoke A") is smaller than the yoke labeled B (hereinafter "yoke B"). Also. The yoke with the symbol C (hereinafter referred to as “yoke C”) in contact with the magnet with the symbol C on the inner magnetic coupling element 31 is smaller than the yoke with the symbol D (hereinafter “yoke D”). It has become. However, the yoke A and the yoke B may be integrally molded, and the yoke C and the yoke D may be integrally molded.
また、 図 2 ( b ) に示すように、 小型の磁石すなわち磁石 A及び磁石 Cは、 個 別に外被 5 9で覆われており、 その上部にスぺーサ 6 0を有している。 なお、 図 2 ( b ) には、 磁石 Cおよびその周囲の構成のみが記載されているが、 磁石 Aお よびその周囲の構成も、 ヨークが磁石の外周側に位置している点を除いて磁石 C およびその周囲の構成と同一である (図 2 ( a ) 参照) 。 As shown in FIG. 2 (b), the small magnets, ie, the magnets A and C, are individually covered with a jacket 59, and have a spacer 60 at an upper portion thereof. Although Fig. 2 (b) shows only the magnet C and its surroundings, the magnet A and its surroundings are also identical except that the yoke is located on the outer periphery of the magnet. The configuration is the same as magnet C and its surroundings (see Fig. 2 (a)).
図 2 ( a ) に示すように、 磁石 A、 CN ヨーク A、 C、 はそれそれ 2個づっ設 けられるとともに、 軸線に対して点対称の位置に配置されており、 磁石 Aと磁石 Cとは互いに対向するように配置されている。 As shown in Fig. 2 (a), magnets A and C N yokes A and C are each provided two at a time, and are arranged at point-symmetric positions with respect to the axis. Are arranged so as to face each other.
この磁気継手は、 磁石 B、 Dの機能を期待せず、 磁石 A、 C間に働く磁気的吸 引力のみにより、 原子炉通常運転時の制御棒位置保持に必要なトルクとして、 ね じ軸 4の軸換算で 0 . 3 k g f m以上の最大伝達トルクを確保している。 なお、 前述したように、 磁気継手を構成する磁石の表面をスリーブ 5 7, 5 8 で覆うだ けでなく、 2極分の磁石 4 8 (磁石 A ) 、 磁石 5 0 (磁石 C ) を個別に外被 5 9 で覆い、 また他の磁石 4 9 (磁石 B ) 、 磁石 5 1 (磁石 D ) の機能を期待せずに 通常運転時の制御棒位置保持トルクを発揮できる構成としているため、 万一スリ
ーブ 5 7、 5 8が破損して磁気継手内部に水等が浸入し、 磁石 4 9 (磁石 B )、 磁石 5 1 (磁石 D ) が発鲭等により機能喪失しても、 より強固に保護された磁石 4 8 (磁石 A ) 、 磁石 5 0 (磁石 C ) の機能は喪失しないため、 確実に制御棒の 位置保持が可能である。 このため信頼性の高い制御棒駆動機構を構築できる。 なお、 万一、 この磁気継手が脱調した場合には以下の手法 ( 1 ) 〜 (2 ) によ り検出することができる。 This magnetic joint does not expect the functions of magnets B and D, but uses only the magnetic attraction acting between magnets A and C as the torque required to maintain the control rod position during normal operation of the reactor. The maximum transmission torque of 0.3 kgfm or more in terms of shaft conversion is secured. As described above, not only are the surfaces of the magnets constituting the magnetic joint covered with the sleeves 57 and 58, but also the magnets 48 (magnet A) and magnet 50 (magnet C) for two poles are individually The control rod position holding torque during normal operation is exhibited without expecting the functions of the other magnets 49 (magnet B) and magnet 51 (magnet D). Shoulder Even if the magnets 57 and 58 break and water or the like enters the inside of the magnetic joint, the magnet 49 (magnet B) and the magnet 51 (magnet D) lose their functions due to firing, etc. Since the functions of the protected magnets 48 (magnet A) and 50 (magnet C) are not lost, the position of the control rod can be securely maintained. Therefore, a highly reliable control rod drive mechanism can be constructed. In the event that the magnetic joint loses synchronism, it can be detected by the following methods (1) and (2).
( 1 ) まず、 第 1の手法について説明する。 この磁気継手は、 正常時には、 内 側/外側磁気継手 3 1、 3 2間で、 小型の磁石 Aと小型の磁石 Cとが対向してい る。 しかし磁気継手が脱調した場合は小型の磁石 A、 Cには大きい磁石 D、 Bが それそれ対向する。 また小型磁石 A、 Cには小型のヨーク A , Cが接しており、 小型磁石 A、 Cが大きい磁石 D、 Bと対向した場合磁力線 5 2をヨーク内に閉じ 込めることができなくなり、 磁気継手周囲に磁力線を放出し、 周囲磁場が変化す る。 このような磁場状態の変化を分離検出プローブ 2 7内に設けた磁気継手脱調 検知用リードスィツチ 3 9により検知することにより、 磁気継手の脱調を検出す ることができる。 なお本実施形態では、 磁気継手内部に一部小型の磁石を組み込 んでいるが、 磁気特性 (例えば磁束密度) の異なる磁石を組み込む等した場合に おいても同様の効果が期待できる。 (1) First, the first method will be described. In this magnetic joint, a small magnet A and a small magnet C face each other between the inner / outer magnetic joints 31 and 32 in a normal state. However, when the magnetic coupling loses synchronism, the small magnets A and C are opposed to the large magnets D and B, respectively. Also, small yokes A and C are in contact with the small magnets A and C. When the small magnets A and C face the large magnets D and B, the lines of magnetic force 52 cannot be confined in the yoke, and the magnetic coupling Magnetic field lines are emitted to the surroundings, and the surrounding magnetic field changes. By detecting such a change in the state of the magnetic field with the magnetic coupling out-of-step detection lead switch 39 provided in the separation detection probe 27, the step-out of the magnetic coupling can be detected. In the present embodiment, a small magnet is partially incorporated inside the magnetic joint. However, similar effects can be expected when magnets having different magnetic properties (for example, magnetic flux density) are incorporated.
( 2 ) 次に、 第 2の手法について説明する。 磁気継手が脱調した場合には、 内 側/外側磁気継手要素 3 1、 3 2間の結合位相が変化するため、 外側磁気継手要 素 3 2に接続された軸 (回転軸 1 ) から位置情報を検知する位置検出装置 2 0の 出力と、 内側磁気継手要素 3 1に接続された中空ビストン 9から位置情報を検知 するスクラム位置検出プローブ 3 0の出力の関係が正常時に対して異なってくる: 従って、 位置検出装置 2 0の出力とスクラム位置検出プローブ 3 0の出力を比 較して、 両者間に所定の関係が成立しているか否かにより、 磁気継手の脱調の有 無を確認することができる。 (2) Next, the second method will be described. If the magnetic joint loses synchronism, the coupling phase between the inner / outer magnetic coupling elements 3 1 and 3 2 changes, so that the position from the axis (rotation axis 1) connected to the outer magnetic coupling element 3 2 changes. The relationship between the output of the position detection device 20 that detects information and the output of the scrum position detection probe 30 that detects position information from the hollow biston 9 connected to the inner magnetic coupling element 31 1 differs from that in the normal state. : Therefore, the output of the position detection device 20 and the output of the scrum position detection probe 30 are compared, and it is confirmed whether or not the step of the magnetic coupling has stepped out based on whether or not a predetermined relationship is established between the two. can do.
以上の手法により、 磁気継手の脱調を検知した場合には、 制御装置 4 2により、 電動機 3 5への電力供給を停止して制御棒の駆動を停止したり、 位置検出装置 2 0の出力とスクラム位置検出プローブ 3 0の出力とが所定の関係から外れている 旨を表示したり、 警報を発生したり等の適切な対応が可能となる。 更にその後の
処置としては、 当該制御棒駆動機構を動作不能の制御棒として隔離する等の適切 な対応を実施することが可能であり、 信頼性の高い制御棒駆動機構を構築するこ とができる。 When the step out of the magnetic coupling is detected by the above method, the controller 42 stops the power supply to the electric motor 35 to stop the drive of the control rod, or the output of the position detector 20. It is possible to display a message indicating that the output of the scrum position detection probe 30 is out of the predetermined relationship with the output of the scrum position detection probe 30 or to generate an alarm. Further later As a measure, it is possible to take appropriate measures such as isolating the control rod drive mechanism as an inoperable control rod, and to construct a highly reliable control rod drive mechanism.
次に、 制御装置 4 2の作用について説明する。 制御装置 4 2は下記の機能を有 する。 Next, the operation of the control device 42 will be described. The control device 42 has the following functions.
( 1 ) 制御装置 4 2は、 運転員の操作に基づき、 制御棒駆動/停止指令を発す る。 この場合、 制御装置 4 2により制御される電源装置 4 1、 4 6が誘導電動機 3 5、 制動用ブレーキ 3 4、 保持用ブレーキ 1 9への電力供給を開始若しくは停 止する。 (1) The control device 42 issues a control rod drive / stop command based on the operation of the operator. In this case, the power supply devices 41 and 46 controlled by the control device 42 start or stop supplying power to the induction motor 35, the braking brake 34 and the holding brake 19.
( 2 ) 制御棒駆動開始時には、 制御装置 4 2は、 まず電源装置 4 6を制御し、 最初に保持用ブレーキ 1 9を開放する。 次いで、 制御装置 4 2は電源装置 4 1を 制御し、 制動用ブレーキ 3 4および誘導電動機 3 5を同時に通電する。 なお、 制 動用ブレーキ 3 4は、 通電されると保持動作をやめ開放状態になる。 これにより 回転軸 1が回転を始める。 (2) At the start of control rod driving, the control device 42 first controls the power supply device 46 and first releases the holding brake 19. Next, the controller 42 controls the power supply 41 to energize the braking brake 34 and the induction motor 35 at the same time. Note that the braking brakes 34 and 4 stop holding when they are energized and are released. This causes the rotating shaft 1 to start rotating.
( 3 ) 制御棒の駆動を停止する際には、 制御装置 4 2はまず電源装置 4 1を制 御し、 最初に制動用ブレーキ 3 4および誘導電動機 3 5への通電を同時に停止す る。 なお、 制動用ブレーキ 3 4は、 非通電時には保持動作を実施する。 そして回 転軸 1の回転が停止した後、 制御装置 4 2は電源装置 4 6を制御し、 保持用ブレ ーキ 1 9を保持状態とする。 (3) When stopping the drive of the control rod, the control device 42 first controls the power supply device 41, and first stops the power supply to the braking brake 34 and the induction motor 35 at the same time. The braking brake 34 performs a holding operation when the power is not supplied. Then, after the rotation of the rotation shaft 1 stops, the control device 42 controls the power supply device 46 to bring the holding brake 19 into the holding state.
このように保持用ブレーキ 1 9と制動用ブレーキ 3 4の作動時期をずらすこと により、 保持用ブレーキ 1 9の摺動による摩耗を低減し、 保持用ブレーキ 1 9の 使用寿命、 信頼性を向上することが可能である。 By shifting the operation timings of the holding brake 19 and the braking brake 34 in this manner, wear due to sliding of the holding brake 19 is reduced, and the service life and reliability of the holding brake 19 are improved. It is possible.
( 4 ) また、 制御装置 4 2は、 制御棒駆動時に停止目標位置の手前例えば 4 mm手前に達した時点で、 駆動停止指令を発するような制御を行うことが可能で ある。 すなわち、 電送遅れ、 また制動用ブレーキ 3 5の能力等を考慮すると制御 装置 4 2から制御棒停止指令発信後、 制御棒は 2 mm以上進んで停止すると考 えられる。 そこで停止目標位置の 4 mm手前で停止指令を発することにより、 停止位置の精度を高めているわけである。 なお、 制御装置 4 2は位置検出装置 2 0から送信される信号に基づいて制御棒の位置を把握しているが、 分離検出プロ
ーブ 2 7及びスクラム位置検出プローブ 3 0からの信号も併せてモニタしている c (4) Further, the control device 42 can perform control to issue a drive stop command when the control rod is driven, for example, 4 mm before the stop target position. That is, considering the transmission delay, the capacity of the braking brake 35, and the like, it is considered that the control rod advances by 2 mm or more and stops after the control rod stop command is transmitted from the control device 42. Therefore, by issuing a stop command 4 mm before the target stop position, the accuracy of the stop position is improved. The control device 42 knows the position of the control rod based on the signal transmitted from the position detection device 20. C being monitored signal even together from over Bed 2 7 and scrum position detecting probe 3 0
( 5 ) 更に、 制御装置 4 2は、 (a ) 温度計 3 7から制御装置 4 2に送信され る信号を監視することにより誘導電動機 3 5の卷線部温度を監視し、 (b ) 温度 計 3 6から制御装置 4 2に送信される信号を監視することにより磁気継手部温度 を監視し、 (c ) そして位置検出装置 2 0から送信される信号を監視することに より制御棒駆動速度を監視する。 制御棒駆動速度は、 位置検出装置 2 0により検 出された制御棒位置を時間に関して微分することにより、 または制御棒位置の単 位時間あたりの変化量から算出することができる。 (5) Further, the controller 42 monitors (a) the temperature of the winding portion of the induction motor 35 by monitoring a signal transmitted from the thermometer 37 to the controller 42, and (b) The temperature of the magnetic joint is monitored by monitoring the signal transmitted from the total 36 to the control device 42, and (c) the control rod drive speed is monitored by monitoring the signal transmitted from the position detection device 20. To monitor. The control rod drive speed can be calculated by differentiating the control rod position detected by the position detection device 20 with respect to time, or from the amount of change per unit time of the control rod position.
そして、 これらの値が第 1の所定値を超えた場合、 図示しない警報発生装置に よりオペレー夕に向けて警報を発する。 なお、 第 1の所定値を超えた場合には、 警報の発生に代えて若しくは警報の発生に加えて、 その旨を表す情報を適当な表 示手段により表示してオペレー夕に伝えるようにしてもよい。 Then, when these values exceed the first predetermined value, an alarm is issued to the operator by an alarm generator (not shown). If the first predetermined value is exceeded, instead of or in addition to the generation of an alarm, information indicating that fact is displayed by an appropriate display means and transmitted to the operator. Is also good.
また、 上記の値が第 1の所定値と比較してより臨界値に近いまた第 2の所定値 を超えた場合、 制御装置 4 2は制御棒の駆動停止指令を発する。 In addition, when the above value is closer to the critical value than the first predetermined value and exceeds the second predetermined value, the control device 42 issues a drive stop command for the control rod.
なお、 上記の説明では、 第 1の所定値と第 2の所定値を設定して、 各所定値を 超えた場合に制御装置 4 2が所定の処置をとるようにしているが、 これに限定さ れるものではなく、 誘導電動機 3 5の卷線部温度、 磁気継手部温度、 制御棒駆動 速度に対して所定の範囲の許容値を設定し、 各パラメ一夕が許容される所定の範 囲を逸脱した場合に、 上記と同様に電動機停止、 警報の発生等の処置をとるよう にしてもよい。 In the above description, the first predetermined value and the second predetermined value are set, and when each of the predetermined values is exceeded, the control device 42 takes a predetermined action. Instead, a predetermined range of allowable values is set for the winding part temperature, the magnetic coupling part temperature, and the control rod drive speed of the induction motor 35, and the predetermined range in which each parameter is allowed is set. In the case of deviating from the above, measures such as stopping the motor and generating an alarm may be taken in the same manner as described above.
( 6 ) 制御装置 4 2はサ一マルリレー 4 3が作動した場合には、 警報を発し、 さらに制御棒駆動停止指令を発する。 これにより、 制御棒の異常検知を迅速に行 えるだけでなく、 磁気継手への過大トルクが負荷されることを防止することがで き、 磁気継手の脱調防止を図ることも可能である。 (6) The control device 42 issues an alarm when the summary relay 43 is activated, and further issues a control rod drive stop command. As a result, not only can the abnormality of the control rod be detected quickly, but also the excessive torque applied to the magnetic coupling can be prevented, and the magnetic coupling can be prevented from stepping out.
なお、 サーマルリレー 4 3を設けることに代えて、 電源装置 4 1に電流計、 電 圧計または電力計を設け、 この電流計等から制御装置 4 2に送信される信号を監 視することにより誘導電動機 3 5に供給される電流値 (電圧値、 電力値でもよ い) を監視し、 その値が第 1の所定値を超えた場合、 図示しない警報発生装置に よりオペレータに向けて警報を発するようにしてもよい。 更に、 第 1の所定値を
超えた場合には、 警報の発生に代えて若しくは警報の発生に加えて、 その旨を表 す情報を適当な表示手段により表示してオペレータに伝えるようにしてもよい。 また、 上記の値が第 1の所定値と比較してより臨界値に近いまた第 2の所定値を 超えた場合、 制御装置 4 2は制御棒の駆動停止指令を発するようにしてもよい。 Instead of providing the thermal relay 43, an ammeter, a voltmeter or a wattmeter is provided in the power supply device 41, and monitoring is performed by monitoring a signal transmitted from the ammeter or the like to the control device 42. Monitors the current value (may be voltage value or power value) supplied to the motor 35, and if the value exceeds the first predetermined value, issues an alarm to the operator by an alarm generator (not shown) You may do so. Further, the first predetermined value is If it exceeds, instead of or in addition to the generation of an alarm, information indicating that fact may be displayed on an appropriate display means to inform the operator. Further, when the above value is closer to the critical value than the first predetermined value or exceeds the second predetermined value, the control device 42 may issue a drive stop command for the control rod.
( 7 ) 制御装置 4 2は、 制御棒の駆動停止後の実際の停止位置と目標停止位置 または駆動停止指令発生時の制御棒位置とを比較し、 実際の停止位置と目標停止 位置または駆動停止指令発生時の制御棒位置との差が所定の範囲を逸脱した場合 に、 前記所定の範囲を逸脱した旨を図示しない表示装置により表示するか、 図示 しない警報発生装置によりオペレータに向けて警報を発する。 (7) The control unit 42 compares the actual stop position after the drive stop of the control rod with the target stop position or the control rod position when the drive stop command is issued, and compares the actual stop position with the target stop position or drive stop. When the difference from the control rod position at the time of command generation deviates from a predetermined range, the deviation from the predetermined range is displayed on a display device (not shown), or an alarm is issued to an operator by an alarm generation device (not shown). Emit.
あるいは、 制御装置 4 2は、 制御棒の駆動停止後の停止位置と制御棒の駆動開 始前の初期位置とを比較し、 停止位置と初期位置との差が所定の範囲を逸脱した 場合に、 前記所定の範囲を逸脱した旨を図示しない表示装置により表示するか、 図示しない警報発生装置によりオペレー夕に向けて警報を発する。 Alternatively, the control device 42 compares the stop position after the drive stop of the control rod with the initial position before the drive start of the control rod, and when the difference between the stop position and the initial position deviates from a predetermined range. The departure from the predetermined range is displayed on a display device (not shown) or an alarm is issued to the operator by an alarm generator (not shown).
( 8 ) 制御装置 4 2は、 位置検出装置 2 0の出力とスクラム位置検出プローブ 3 0の出力を比較し、 制御棒全挿入位置、 制御棒全引き抜き位置またはその他の 位置において、 両者の関係が所定の関係から外れた場合に、 警報を発し、 さらに 制御棒駆動停止指令を発する。 (8) The control device 42 compares the output of the position detection device 20 with the output of the scrum position detection probe 30 and finds that the relationship between the two at the control rod full insertion position, control rod full withdrawal position, or other positions. If the specified relationship is not established, an alarm is issued and a control rod drive stop command is issued.
( 9 ) 制御装置 4 2は、 磁気継手脱調検知用リードスィッチ 3 9が作動した際、 警報を発し、 制御棒の駆動停止指令を発する。 (9) When the magnetic coupling step-out detection reed switch 39 is activated, the control device 42 issues an alarm and issues a control rod drive stop command.
( 1 0 ) 制御装置 4 2は、 サ一マルリレーが作動した場合、 警報を発し、 電動 機への電力供給を停止する。 (10) The control device 42 issues an alarm when the thermal relay is activated, and stops the power supply to the motor.
( 1 1 ) 制御装置 4 2は、 制御棒挿入操作時に、 一旦目標停止位置を超えて制 御棒を挿入し、 その後、 自動的に制御棒を目標停止位置まで引き抜く駆動モード を実行することができる。 (1 1) The control device 42 can execute a drive mode in which the control rod is inserted once beyond the target stop position during the control rod insertion operation, and then the control rod is automatically pulled out to the target stop position. it can.
上述のように制御装置 4 2により実施される各制御により、 制御棒駆動の正確 性が担保され、 また、 制御棒駆動機構の状態に基づいた警報の発生や、 制御棒駆 動停止といった対応が可能であり、 制御棒駆動機構の信頼性が向上する。
第 2の実施形態 As described above, the control performed by the control device 42 ensures the accuracy of the control rod drive, and also enables the generation of an alarm based on the state of the control rod drive mechanism and the stop of the control rod drive. It is possible, and the reliability of the control rod drive mechanism is improved. Second embodiment
次に、 図 3を参照して第 2の実施形態について説明する。 第 2の実施形態は、 制御棒駆動機構の一部をなす磁気継手の点検を行う方法および装置に関する。 図 3は、 図 1に示す制御棒駆動機構から電動機アセンブリを取り外した状態を 示している。 なお、 この場合、 スクラム位置検出プローブ 3 0、 分離検出プロ一 ブ 2 7等も取外されている。 Next, a second embodiment will be described with reference to FIG. The second embodiment relates to a method and an apparatus for inspecting a magnetic coupling forming a part of a control rod drive mechanism. FIG. 3 shows a state where the motor assembly is removed from the control rod drive mechanism shown in FIG. In this case, the scrum position detection probe 30 and the separation detection probe 27 are also removed.
本実施形態では、 図 3に示すように、 外側磁気継手要素 3 2は、 その下部の各 磁石の極に対応した位置に開口部 6 1を有する構成となっており、 外側磁気継手 要素 3 2とスプールピース 1 4隔壁部との間に磁気センサ 6 2を挿入可能な構成 としている。 In the present embodiment, as shown in FIG. 3, the outer magnetic coupling element 32 has an opening 61 at a position corresponding to the pole of each magnet below the outer magnetic coupling element 32. The magnetic sensor 62 can be inserted between the spool piece 14 and the partition wall.
次に磁気継手の第 1の検査方法について説明する。 まず、 磁気センサ 6 2と、 磁気センサ 6 2に接続したケーブル 6 3及び記録計 6 4を有する第 1の試験装置 を準備し、 原子炉停止時のプラント定検時に電動機アセンブリを取外した際、 磁 気センサ 6 2を前記外側磁気継手 3 2とスプールビース 1 4隔壁部との間に挿入 する。 Next, a first inspection method of the magnetic coupling will be described. First, a first test apparatus having a magnetic sensor 62, a cable 63 connected to the magnetic sensor 62, and a recorder 64 was prepared.When the motor assembly was removed at the time of the plant periodic inspection when the reactor was stopped, The magnetic sensor 62 is inserted between the outer magnetic joint 32 and the spool bead 14 partition.
前述したように、 磁気継手は内側/外側磁気継手要素 3 1、 3 2間の磁気的相 互作用により伝達トルクを発生している。 そこで内側/外側磁気継手要素 3 1、 3 2間の磁気 (例えば磁場強度) を測定することにより、 伝達トルクの劣化傾向 等を確認することができる。 As described above, the magnetic coupling generates a transmission torque by magnetic interaction between the inner / outer magnetic coupling elements 31 and 32. Therefore, by measuring the magnetism (for example, magnetic field strength) between the inner / outer magnetic coupling elements 31 and 32, it is possible to confirm the tendency of the transmission torque to degrade.
なお磁気センサ 6 2により磁気測定を実施することに代えて、 外側磁気継手 3 2とスプールピース 1 4隔壁部間、 あるいはスプールピース 1 4外側の漏洩磁場 の強い場所にコイル等を設置し、 磁気継手を回転させ、 その際に生じる磁場変動 に伴う誘導起電力を測定することによつても、 同様に磁気継手の伝達トルクを確 認することが可能である。 Instead of performing magnetic measurement with the magnetic sensor 62, a coil or the like is installed between the outer magnetic joint 32 and the spool piece 14 partition wall or in a location where the leakage magnetic field is strong outside the spool piece 14 and the magnetic field is measured. It is also possible to confirm the transmission torque of the magnetic joint by rotating the joint and measuring the induced electromotive force associated with the magnetic field fluctuation generated at that time.
なお、 磁気センサ 6 2、 ケーブル 6 3及び記録計 6 4は当該検査を実施する際 に取付け、 原子炉運転時は取外しておく。 もちろん磁気センサ 6 2、 ケーブル 6 3及び記録計 6 4を常時接続し、 磁気継手の状態を監視することも可能であるが、 仮設接続することにより、 常時監視のために必要となるケーブル配線、 制御装置 等が不要となる。 また第 1の試験装置をプラント運転中は格納容器外に保管、 点
検することにより点検作業時の被ばく低減にも寄与する。 また磁気センサ 6 2等 をプラント運転中は格納容器外に保管することにより、 磁気センサ 6 2等への放 射線照射条件等が緩和され、 機器健全性確保の点でも有効である。 The magnetic sensor 62, cable 63, and recorder 64 should be installed when conducting the inspection, and removed during reactor operation. Of course, it is possible to always connect the magnetic sensor 62, the cable 63, and the recorder 64 to monitor the state of the magnetic joint.However, by temporarily connecting, the cable wiring required for constant monitoring is possible. A control device is not required. The first test equipment was stored outside the containment vessel during plant operation, and Inspection contributes to reduction of exposure during inspection work. By storing the magnetic sensors 62 and the like outside the containment during plant operation, the radiation irradiation conditions and the like to the magnetic sensors 62 and the like are relaxed, which is also effective in ensuring the integrity of equipment.
次に磁気継手の第 2の検査方法について説明する。 第 2の検査方法を実施する 際には、 第 2の試験装置を用いる。 第 2の試験装置は、 トルクメータ 6 5、 トル ク制限器 6 6、 回転角測定器 6 7及び手回し可能なアーム 6 8が結合された軸 6 9により構成されている。 Next, a second inspection method of the magnetic coupling will be described. When performing the second inspection method, use the second test equipment. The second test apparatus is composed of a shaft 69 to which a torque meter 65, a torque limiter 66, a rotation angle measuring device 67, and a hand-arm 68 are connected.
第 2の検査を実施する際には、 まず、 電動機アセンブリを取外した状態で、 第 2の試験装置の軸 6 9を、 スプールビース 1 4下部のカツプリング 2に結合する c 次に、 ナツト 5位置を機械的最下限状態 ( 「機械的最下限状態」 の定義は [発 明の背景] の項を参照) とし、 第 2の試験装置を接続する。 この状態において、 アーム 6 8に制御棒引抜き方向にトルクを印可する。 しかし、 このときナット 5 は機械的最下限状態にありそれ以上引抜きを行うことができないため、 内側磁気 継手要素 3 1も引抜き方向に回転することはできない。 When conducting the second inspection, first, with the motor assembly removed, connect the shaft 69 of the second test device to the coupling 2 below the spool bead 14 c. Is the mechanical minimum state (for the definition of “mechanical minimum state”, see [Background of the Invention]), and a second test apparatus is connected. In this state, a torque is applied to the arm 68 in the control rod withdrawing direction. However, at this time, the nut 5 is at the mechanical lowermost limit state and cannot be further pulled out, so that the inner magnetic coupling element 31 cannot rotate in the pulling-out direction.
従って、 外側磁気継手要素 3 2は、 印可されたトルクの大きさに応じて、 内側 磁気継手 3 1に対して回転し、 両者の間には位相差が生じる。 Therefore, the outer magnetic coupling element 32 rotates with respect to the inner magnetic coupling 31 according to the magnitude of the applied torque, and a phase difference occurs between the two.
図 2に示すような 8極の磁石を有する磁気継手においては、 図 4に示すように 位相差が約 2 2 . 5度において最大伝達トルクを発生する。 そこでアーム 6 8に 印可するトルクを徐々に増していくと、 約 2 2 . 5度のねじれ角近傍で最大伝達 トルクを発揮する。.これ以上アーム 6 8を回すと、 トルクが低下するとともに磁 気継手が脱調する。 In a magnetic joint having an eight-pole magnet as shown in FIG. 2, a maximum transmission torque is generated when the phase difference is about 22.5 degrees as shown in FIG. Therefore, when the torque applied to the arm 68 is gradually increased, the maximum transmission torque is exhibited near a torsion angle of about 22.5 degrees. If the arm 68 is turned any further, the torque will decrease and the magnetic coupling will step out.
この特性を利用して以下の手法により、 磁気継手の伝達トルクが所定の規格値 以上であることを確認することができる。 By utilizing this characteristic, the following method can be used to confirm that the transmission torque of the magnetic joint is equal to or higher than a predetermined standard value.
( 1 ) アーム 6 8にトルクを印加し、 トルクメ一夕 6 5により最大トルクを確 認する。 なお、 この際には、 回転角測定器 6 7の検出値とトルクメータ 6 5の検 出値を関連づけて記録することにより、 磁気継手の回転角一トルクの関係を把握 することがより好ましい。 なお、 この手法をとる場合には、 トルク制限器 6 6は 必ずしも必要ではないが、 検査中に磁気継手が脱調してしまうことを防止する観 点からは、 トルク制限器 6 6を用いた方が好ましい。
( 2 ) トルク制限器 6 6による制限トルクを所定の規格値に設定する。 そして アーム 6 8にトルクを印加し、 トルク制限値までトルクを印加しても磁気継手が 脱調しないことを確認する。 トルクメ一夕 6 5および回転角測定器 6 7は必ずし も必要ではないが、 トルクメ一夕 6 5により回転角測定器 6 7によ測定を行いな がら試験を行うこともまた好ましい。 (1) Apply torque to the arm 68 and check the maximum torque with the torque meter 65. In this case, it is more preferable to grasp the relationship between the rotation angle and the torque of the magnetic joint by recording the detected value of the rotation angle measuring device 67 and the detected value of the torque meter 65 in association with each other. When using this method, the torque limiter 66 is not always necessary, but from the viewpoint of preventing the magnetic joint from stepping out during the inspection, the torque limiter 66 was used. Is more preferred. (2) Set the torque limit by the torque limiter 66 to a specified standard value. Then, torque is applied to the arm 68, and it is confirmed that the magnetic coupling does not lose synchronism even when the torque is applied to the torque limit value. Although the torque meter 65 and the rotation angle measuring device 67 are not necessarily required, it is also preferable to perform a test while performing the measurement with the rotation angle measuring device 67 using the torque meter 65.
上記第 1および第 2の試験方法によれば、 スプールビース 1 4を制御棒駆動機 構から取外すことなく、 磁気継手の伝達トルク確認可能であり、 定検時の作業量 /工程/被ばく量の低減を図ることが可能である。 また、 スプールビース 1 4を 制御棒駆動機構から取外すことなく、 磁気継手の伝達トルクを確認することが可 能であり、 定検時の作業量/工程/被ばく量の低減を図ることが可能である。 また、 特に、 第 2の検査方法においては、 磁気を測定するのではなく直接伝達 トルクを測定するため、 第 1の検査方法と比較し、 より精度の高い伝達トルク測 定が可能となる。 According to the first and second test methods, the transmission torque of the magnetic joint can be checked without removing the spool bead 14 from the control rod drive mechanism, and the work amount / process / exposure amount at the time of the regular inspection can be checked. Reduction can be achieved. Also, it is possible to check the transmission torque of the magnetic joint without removing the spool bead 14 from the control rod drive mechanism, and to reduce the amount of work / process / exposure during regular inspection. is there. In particular, in the second inspection method, the transmission torque is directly measured instead of measuring the magnetism, so that the transmission torque can be measured with higher accuracy than the first inspection method.
以上説明したように、 本実施形態によれば、 磁気継手の健全性を確認する有効 な手法を確立することができ、 そして上記手法を用いることにより、 より信頼性 の高い、 磁気継手を用いた制御棒駆動機構を構築することができる。 As described above, according to the present embodiment, an effective method for confirming the soundness of the magnetic coupling can be established, and by using the above method, a more reliable magnetic coupling can be used. A control rod drive mechanism can be constructed.
なお、 上記と同様の試験を電動機ァセンブリを取り外すことなく実施すること もできる。 この方法は、 電動機アセンブリの回転軸 1を制動用ブレーキ 3 4の下 方からケ一シングを貫通させて突出するよう構成し、 突出した回転軸 1の先端に 上記第 2の試験装置を接続することにより可能となる。 第 3の実施形態 The same test as described above can be performed without removing the motor assembly. In this method, the rotating shaft 1 of the motor assembly is configured to penetrate the casing from below the braking brake 34 to protrude, and the second test device is connected to the tip of the protruding rotating shaft 1. This is possible. Third embodiment
次に、 図 5を参照して第 3の実施形態について説明する。 第 2の実施形態は、 制御棒駆動機構の一部をなすスプールピースおよび磁気継手の点検を行う方法お よび装置に関する。 Next, a third embodiment will be described with reference to FIG. The second embodiment relates to a method and an apparatus for inspecting a spool piece and a magnetic coupling that are part of a control rod drive mechanism.
図 5には、 本実施形態に係るスプールビース試験装置に、 制御棒駆動機構から 取外したスプールピース 1 4を設置した状態を示している。 FIG. 5 shows a state in which the spool piece 14 removed from the control rod drive mechanism is installed in the spool bead testing device according to the present embodiment.
まず、 スプールビース試験装置の構成について説明する。 スプールピース試験 装置は、 スプールピース 1 4の上部開口を塞ぐ上蓋 7 1を有する。 上蓋 7 1には、
固定治具 7 3を介して軸 7 2が固定されており、 軸 7 2の下端には内側磁気継手 要素 3 1に接続できるカヅプリング 7 0 aが設けられている。 上蓋 7 1には、 ス プールピース 1 4内部を加圧するための加圧ポンプ 7 6及び圧力測定のための圧 力計 7 7が接続されている。 First, the configuration of the spool bead test device will be described. The spool piece test apparatus has an upper lid 71 that closes an upper opening of the spool piece 14. The top lid 7 1 The shaft 72 is fixed via a fixing jig 73, and a coupling 70 a that can be connected to the inner magnetic coupling element 31 is provided at the lower end of the shaft 72. A pressure pump 76 for pressurizing the inside of the spool piece 14 and a pressure gauge 77 for pressure measurement are connected to the upper lid 71.
次に、 上記のスプールビース試験装置を用いてスプールピースおよび磁気継手 の点検を行う方法について説明する。 Next, a method for inspecting a spool piece and a magnetic coupling using the above-described spool bead testing apparatus will be described.
まず、 制御棒駆動機構から電動機アセンブリおよびスプールビース 1 4を取り 外し、 スプールビース試験装置の架台 7 0上に載置する。 次にカップリング 7 0 aを分離検出マグネット 2 5を支持する部材の軸に結合する。 すると、 軸 7 2は 回転不能であるため、 内側磁気継手要素 3 1に結合された駆動軸 3も回転できな い状態となる。 次いで、 上蓋 7 1をポルト 7 4によりスプールピース 1 4に取り 付ける。 なお、 このとき、 上蓋 7 1とスプールビース 1 4との間を 0リング 7 5 によりシールする。 First, the electric motor assembly and the spool bead 14 are removed from the control rod drive mechanism, and placed on the mount 70 of the spool bead test apparatus. Next, the coupling 70a is coupled to a shaft of a member supporting the separation detection magnet 25. Then, since the shaft 72 cannot rotate, the drive shaft 3 connected to the inner magnetic coupling element 31 cannot rotate. Next, the upper lid 71 is attached to the spool piece 14 by a port 74. At this time, the space between the upper lid 71 and the spool bead 14 is sealed with an O-ring 75.
また、 スプールビース 1 4下部に位置する外側磁気継手 4 2の軸に結合された カップリング 2には、 第 2の実施形態で説明した第 2の検査装置を接続する。 この状態では、 駆動軸 3が回転不能であるため、 アーム 6 8にトルクを印可し ても、 内側磁気継手要素 3 1は回転することができない。 従って、 外側磁気継手 要素 3 2は、 それに印可されたトルクの大きさに応じて、 内側磁気継手要素 3 1 に対して回転し、 両者の間に位相差が生じる。 このときの伝達トルクを測定する ことにより、 第 2の実施形態と同様に磁気継手の最大伝達トルクを測定すること が可能となる。 Further, the second inspection device described in the second embodiment is connected to the coupling 2 coupled to the shaft of the outer magnetic joint 42 located below the spool bead 14. In this state, since the drive shaft 3 cannot rotate, the inner magnetic coupling element 31 cannot rotate even if torque is applied to the arm 68. Therefore, the outer magnetic coupling element 32 rotates with respect to the inner magnetic coupling element 31 in accordance with the magnitude of the torque applied thereto, and a phase difference occurs between the two. By measuring the transmission torque at this time, it is possible to measure the maximum transmission torque of the magnetic joint as in the second embodiment.
更に、 加圧ポンプ 7 6からスプールビース 1 4内部を加圧することにより、 ス ブールビース 1 4の耐圧試験を実施することができる。 Further, by pressurizing the inside of the spool bead 14 from the pressurizing pump 76, a pressure test of the spool bead 14 can be performed.
なお、 本実施形態のようにスプールピース 1 4が制御棒駆動機構から取り外さ れている場合には、 外側磁気継手要素 3 2側を固定し、 カップリング 7 0 aに第 2の検査装置を接続して内側磁気継手要素 3 1側を回転させても磁気継手の最大 伝達トルクを測定することが可能である。 When the spool piece 14 is removed from the control rod drive mechanism as in the present embodiment, the outer magnetic coupling element 32 is fixed, and the second inspection device is connected to the coupling 70a. Even when the inner magnetic coupling element 31 is rotated, the maximum transmission torque of the magnetic coupling can be measured.
以上説明したように、 スプールビース 1 4を点検する際に制御棒駆動機構から スプールピース 1 4を取外し、 格納容器外に設置された本実施形態に係る試験装
置にて磁気継手のトルク確認を行うことにより、 第 2の実施形態で説明した方法 に比べて容易に作業を行うことが可能であり、 被ばく低減にも寄与する。 As described above, when inspecting the spool bead 14, the spool piece 14 is removed from the control rod drive mechanism, and the test device according to the present embodiment installed outside the containment vessel is installed. By confirming the torque of the magnetic joint at the position, the work can be performed easily as compared with the method described in the second embodiment, which contributes to the reduction of exposure.
従って、 スプールピース 1 4を取外さない場合は第 2の実施形態に記載の手法 で、 スプールピース 1 4を取外す場合は第 3の実施形態に記載された手法で磁気 継手のトルク確認を実施するのが有効である。 第 4の実施形態 Therefore, when the spool piece 14 is not removed, the torque of the magnetic coupling is confirmed by the method described in the second embodiment, and when the spool piece 14 is removed, the torque of the magnetic coupling is confirmed by the method described in the third embodiment. Is effective. Fourth embodiment
次に、 図 6を参照して第 4の実施形態について説明する。 第 4の実施形態は、 制御棒駆動機構の一部をなすスプールビース 1 4および磁気継手の分解、 点検等 を行う方法および装置に関する。 Next, a fourth embodiment will be described with reference to FIG. The fourth embodiment relates to a method and an apparatus for disassembling and inspecting a spool bead 14 and a magnetic coupling which form a part of a control rod drive mechanism.
図 6は、 本実施形態に係る制御棒駆動機構点検装置内にスプールピース 1 4を 設置し、 スプールビース 1 4の分解/組立を実施している状態を示している。 図 6に示すように、 点検装置は、 スプールピース 1 4および磁気継手を収容可 能な水槽 7 8を有する。 水槽 7 8内には、 スプールピース 1 4を載置するための 台 7 9が設けられている。 FIG. 6 shows a state in which the spool piece 14 is installed in the control rod drive mechanism inspection device according to the present embodiment, and the spool bead 14 is being disassembled / assembled. As shown in FIG. 6, the inspection device has a water tank 78 that can accommodate a spool piece 14 and a magnetic coupling. A stand 79 on which the spool piece 14 is placed is provided in the water tank 78.
更に、 水槽 7 8内には、 レール 9 0、 9 1が台 7 9に載置されたスプールビー ス 1 4の軸線方向に沿って敷設されている。 これらレール 9 0、 9 1上には、 台 車 8 4、 8 5が、 レール 9 0、 9 1にそれそれ沿って移動可能に設けられている c 台車 8 4、 8 5は、 内側磁気継手要素 3 1および外側磁気継手要素 3 2にそれそ れ対応している。 Further, rails 90 and 91 are laid in the water tank 78 along the axis of the spool bead 14 mounted on the stand 79. On these rails 90, 91, trucks 84, 85 are provided, and on rails 90, 91, c trucks 84, 85 are provided so as to be movable along them. Element 31 and outer magnetic coupling element 32 correspond respectively.
台車 8 4には、 軸 8 1が回転可能に取り付けられており、 軸 8 1は台 7 9に載 置されたスプールビース 1 4の軸線と同一線上に位置している。 軸 8 3の先端に は、 カップリング 8 1が設けられている。 カップリング 8 1は、 内側磁気継手要 素 3 1に結合された軸に結合することができる。 同様に、 台車 8 5には、 軸 8 2 が回転可能に取り付けられており、 軸 8 2は台 7 9に載置されたスプールピース 1 4の軸線と同一線上に位置している。 軸 8 2の先端には、 カップリング 8 0が 設けられている。 カップリング 8 0は、 外側磁気継手要素 3 2に接続された軸に 結合することができる。 A shaft 81 is rotatably mounted on the cart 84, and the shaft 81 is located on the same line as the axis of the spool bead 14 mounted on the platform 79. A coupling 81 is provided at the end of the shaft 83. The coupling 81 can be coupled to a shaft coupled to the inner magnetic coupling element 31. Similarly, a shaft 82 is rotatably mounted on the cart 85, and the shaft 82 is located on the same line as the axis of the spool piece 14 placed on the platform 79. A coupling 80 is provided at the tip of the shaft 82. The coupling 80 can be connected to a shaft connected to the outer magnetic coupling element 32.
更に、 レール 9 0、 9 1上には、 台車 8 8、 8 9が、 レール 9 0、 9 1にそれ
それ沿って台 7 9に載置されたスプールビース 1 4の軸線方向に移動可能に設け られている。 台車 8 8には、 内側磁気継手要素 3 1の周囲を覆う磁性体の外被 8 6が設けられている。 また台車 8 9には、 外側磁気継手要素 3 2の周囲を覆う磁 性体の外被 8 7が設けられている。 In addition, trolleys 88, 89 are placed on rails 90, 91 and rails 90, 91. Along the axis, a spool bead 14 placed on a table 79 is provided so as to be movable in the axial direction. The cart 88 is provided with a magnetic jacket 86 that covers the periphery of the inner magnetic coupling element 31. Further, the bogie 89 is provided with a magnetic material jacket 87 surrounding the outer magnetic coupling element 32.
また、 水槽 7 8内には、 超音波発振設備 9 2が設けられており、 水で満たされ た水槽 7 8内部に入れたスプールピース 1 4等を超音波洗浄可能な構成としてい る。 また水槽 7 8内には移動可能な磁石 9 3が設置されている。 更に、 この点検 装置は、 加圧空気を供給するホース 9 4を有している。 Further, an ultrasonic oscillation facility 92 is provided in the water tank 78 so that the spool piece 14 and the like put in the water tank 78 filled with water can be ultrasonically cleaned. A movable magnet 93 is provided in the water tank 78. Further, the inspection device has a hose 94 for supplying pressurized air.
次に、 作用について説明する。 内側磁気継手要素 3 1および外側磁気継手要素 3 2が組合わせた状態では、 磁力線が磁気継手内に大部分閉じ込められるため特 に問題ないものの、 内側磁気継手要素 3 1と外側磁気継手要素 3 2とを分離した 状態では、 周囲に磁力線が放散されるため、 周囲機器への磁気影響、 及び周囲の 磁性体が吸引されることにより接触事故等が起きる可能性がある。 Next, the operation will be described. When the inner magnetic coupling element 3 1 and the outer magnetic coupling element 3 2 are combined, there is no particular problem because the magnetic field lines are mostly confined in the magnetic coupling, but the inner magnetic coupling element 3 1 and the outer magnetic coupling element 3 2 In the state where the magnetic field lines are separated from each other, magnetic lines of force are radiated to the surroundings, and there is a possibility that a magnetic accident on peripheral devices and a magnetic material in the surroundings may be attracted, resulting in a contact accident or the like.
—方、 上記のような点検装置を用いた場合には、 内側磁気継手要素 3 1および 外側磁気継手要素 3 2の軸をスプールビース 1 4の軸線上に固定した状態で内側 磁気継手要素 3 1および外側磁気継手要素 3 2の分離 ·結合が可能であるため、 磁気継手が他機器と接触することにより損傷することを防止できる。 On the other hand, when the inspection device as described above is used, the inner magnetic coupling element 3 1 is fixed with the shafts of the inner magnetic coupling element 31 and the outer magnetic coupling element 32 fixed on the axis of the spool bead 14. Since the magnetic coupling element 32 and the outer magnetic coupling element 32 can be separated and connected, it is possible to prevent the magnetic coupling from being damaged by contact with other devices.
また内側及び外側磁気継手要素 3 1、 3 2の周囲を、 それそれ磁性体の外被 8 6、 8 7で覆うことにより、 周囲への磁場漏洩を低減し、 周囲機器への影響を低 減することができる。 In addition, the surrounding of the inner and outer magnetic coupling elements 31 and 32 are covered with magnetic jackets 86 and 87, respectively, to reduce magnetic field leakage to the surroundings and reduce the effect on peripheral equipment. can do.
更に、 水槽 7 8内の磁石 9 3を水槽 7 8内で移動させることにより、 水槽 7 8 内の磁性粉等を回収可能であり、 内側磁気継手要素 3 1と外側磁気継手要素 3 2 の表面に磁性粉等が付着すること低減することができる。 Further, by moving the magnet 93 in the water tank 78 within the water tank 78, the magnetic powder and the like in the water tank 78 can be collected, and the surfaces of the inner magnetic coupling element 31 and the outer magnetic coupling element 32 can be recovered. Of magnetic powder and the like can be reduced.
本実施形態では、 水槽 7 8内において内側及び外側磁気継手要素 3 1、 3 2の 周囲を覆う磁性体の外被 8 6、 8 7を設けているが、 スプールビース 1 4の周囲 も磁性体の外被で覆うようにしてもよい。 また、 内側及び外側磁気継手要素 3 1、 3 2及びスプールビース 1 4の保管、 運搬の際にも周囲を磁性体の外被で覆うこ とにより、 周囲機器への磁気影響を低減することができる。 In the present embodiment, the outer shells 86, 87 of the magnetic material are provided to cover the inner and outer magnetic coupling elements 31 and 32 in the water tank 78. May be covered with a jacket. Also, when storing and transporting the inner and outer magnetic coupling elements 31 and 32 and the spool beads 14, it is possible to reduce the magnetic effect on peripheral devices by covering the surroundings with a magnetic material jacket. it can.
また、 内側及び外側磁気継手要素 3 1、 3 2の点検、 保管、 運搬の際、 内側及
び外側磁気継手要素 3 1、 3 2の周囲を非磁性体例えばビニール等により覆うこ とにより、 磁性体等の異物付着を防止することが可能である。 Also, when inspecting, storing and transporting the inner and outer magnetic coupling elements 31 and 32, By covering the periphery of the outer and outer magnetic coupling elements 31 and 32 with a non-magnetic material such as vinyl, it is possible to prevent foreign substances such as a magnetic material from adhering.
また内側及び外側磁気継手要素 3 1、 3 2に磁性粉等の異物が付着した場合、 あるいはその他の機器に異物が付着している場合等は、 ホース 9 4から加圧空気 を該当機器へむけて噴出することにより、 磁性粉あるいはその他の異物を除去す ることが可能である。
If foreign matter such as magnetic powder adheres to the inner and outer magnetic coupling elements 31 and 32, or if foreign matter adheres to other equipment, pressurized air from the hose 94 to the corresponding equipment. It is possible to remove magnetic powder or other foreign matter by ejecting the powder.
Claims
1 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 1. A control rod driving device for driving a control rod of a reactor up and down,
誘導電動機を有し、 前記誘導電動機が発生した駆動力を制御棒に伝達して、 制 御棒を昇降させる駆動機構と、 A drive mechanism having an induction motor, transmitting a driving force generated by the induction motor to a control rod, and raising and lowering the control rod;
前記誘導電動機に電力を供給する電源と、 A power supply for supplying power to the induction motor;
前記電源と前記誘導電動機との間に設けられ、 電力の供給及び供給停止の切り 替えを行う直列に配置された複数のスィツチと、 A plurality of switches provided between the power supply and the induction motor and arranged in series for switching between supply and stop of power supply;
前記複数のスィツチのうち少なくとも 2つを互いに独立して開閉制御可能な制 御装置と、 を備えたことを特徴とする制御棒駆動装置。 A control device capable of controlling opening and closing of at least two of the plurality of switches independently of each other.
2 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 2. A control rod driving device for driving a control rod of a reactor up and down,
誘導電動機を有し、 前記誘導電動機が発生した駆動力を前記制御棒に伝達して、 前記制御棒を昇降させる駆動機構と、 A drive mechanism having an induction motor, transmitting a driving force generated by the induction motor to the control rod, and raising and lowering the control rod;
制御棒の位置を検出する位置検出装置と、 A position detecting device for detecting the position of the control rod,
前記位置検出装置の出力に基づいて制御棒の速度を算出し、 制御棒の速度が所 定の値となった場合に、 前記電動機への電力供給の停止、 前記所定値となった旨 の表示および警報の発生のうち少なくとも 1つを実行する制御装置と、 を備えた ことを特徴とする制御棒駆動装置。 The speed of the control rod is calculated based on the output of the position detection device, and when the speed of the control rod reaches a predetermined value, the supply of power to the electric motor is stopped, and an indication that the predetermined value has been reached. And a control device that performs at least one of the generation of an alarm. A control rod driving device, comprising:
3 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 3. A control rod drive device for driving a control rod of a reactor up and down,
電動機を有し、 前記電動機が発生した駆動力を前記制御棒に伝達して、 前記制 御棒を昇降させる駆動機構と、 A drive mechanism having an electric motor, transmitting a driving force generated by the electric motor to the control rod, and raising and lowering the control rod;
制御棒の位置を検出する位置検出装置と、 A position detecting device for detecting the position of the control rod,
制御棒の駆動停止後の実際の停止位置と、 目標停止位置または駆動停止指令発 生時の制御棒位置とを比較し、 実際の停止位置と、 目標停止位置または駆動停止 指令発生時の制御棒位置との差が所定の範囲を逸脱した場合に、 前記所定の範囲 を逸脱した旨の表示および警報の発生のうち少なくとも 1つを実行する制御装置 と、 を備えたことを特徴とする制御棒駆動装置。 Compare the actual stop position after the drive stop of the control rod with the target stop position or the control rod position when the drive stop command is issued, and compare the actual stop position with the target stop position or the control rod when the drive stop command is issued. A control device for executing at least one of a display indicating that the position deviates from the predetermined range and a warning when the difference from the position deviates from the predetermined range. Drive.
4 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 4. A control rod driving device for driving a control rod of a reactor up and down,
電動機を有し、 前記電動機が発生した駆動力を前記制御棒に伝達して、 前記制
御棒を昇降させる駆動機構と、 An electric motor, and transmitting a driving force generated by the electric motor to the control rod, A drive mechanism for raising and lowering the rod,
制御棒の位置を検出する位置検出装置と、 A position detecting device for detecting the position of the control rod,
制御棒の駆動停止後の停止位置と制御棒の駆動開始前の初期位置とを比較し、 停止位置と初期位置との差が所定の範囲を逸脱した場合に、 前記所定の範囲を逸 脱した旨の表示および警報の発生のうち少なくとも 1つを実行する制御装置と、 を備えたことを特徴とする制御棒駆動装置。 The stop position after the drive stop of the control rod is compared with the initial position before the start of drive of the control rod, and when the difference between the stop position and the initial position deviates from a predetermined range, the control rod deviates from the predetermined range. And a control device that performs at least one of a display indicating that the alarm has occurred and an alarm.
5 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 5. A control rod driving device for driving a control rod of a reactor up and down,
電動機を有し、 前記電動機が発生した駆動力を制御棒に伝達して、 前記制御棒 を昇降させる駆動機構と、 A driving mechanism having an electric motor, transmitting a driving force generated by the electric motor to a control rod, and raising and lowering the control rod;
前記駆動機構に設けられ、 前記駆動機構の駆動力伝達部材に対して制動または 保持動作を行う第 1のブレーキおよび第 2のブレーキと、 A first brake and a second brake that are provided in the drive mechanism and perform a braking or holding operation on a driving force transmission member of the drive mechanism;
制御棒の駆動停止を行う際、 前記第 1のブレーキにより制動または保持動作を 実施させ、 その後に前記第 2のブレーキにより制動または保持動作を実施させる ように、 前記第 1および第 2のブレーキを制御する制御装置と、 を備え、 前記制御装置は、 前記電動機への電力供給停止後または制御棒の移動が停止し た後に、 前記第 2のブレーキにより制動または保持動作を実施することを特徴と する、 制御棒駆動装置。 When the drive of the control rod is stopped, the first and second brakes are operated such that the first brake performs a braking or holding operation, and then the second brake performs a braking or holding operation. A control device for controlling, wherein the control device performs braking or holding operation by the second brake after stopping supply of power to the electric motor or after stopping movement of the control rod. To control rod drive.
6 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 6. A control rod driving device for driving a control rod of a reactor up and down,
電動機を有し、 前記電動機が発生した駆動力を前記制御棒に伝達して、 前記制 御棒を昇降させる駆動機構と、 A drive mechanism having an electric motor, transmitting a driving force generated by the electric motor to the control rod, and raising and lowering the control rod;
前記駆動機構に設けられ、 前記駆動機構の駆動力伝達部材に対して制動または 保持動作を行う第 1のブレーキおよび第 2のブレーキと、 A first brake and a second brake that are provided in the drive mechanism and perform a braking or holding operation on a driving force transmission member of the drive mechanism;
制御棒の駆動開始の際、 前記第 2のブレーキによる保持動作を解除し、 その後 に前記第 1のブレーキによる保持動作を解除するように、 前記第 1および第 2の ブレーキを制御する制御装置と、 を備えたことを特徴とする制御棒駆動装置。 A control device that controls the first and second brakes so as to release the holding operation by the second brake at the start of driving of the control rod and then release the holding operation by the first brake; A control rod drive, comprising:
7 . 前記制御装置は、 前記電動機への電力供給開始前に、 前記第 2のブレー キによる保持動作を解除することを特徴とする、 請求項 6に記載の制御棒駆動装 7. The control rod driving device according to claim 6, wherein the control device cancels the holding operation by the second brake before starting power supply to the electric motor.
8 . 誘導電動機を有するとともに前記誘導電動機が発生した駆動力を前記制
御棒に伝達して前記制御棒を昇降させる駆動機構を備えた制御棒駆動装置を試験 する試験方法であって、 8. Having an induction motor and controlling the driving force generated by the induction motor A test method for testing a control rod driving device having a drive mechanism for transmitting to a control rod to raise and lower the control rod,
前記誘導電動機を駆動して制御棒の駆動を行う際に制御棒の移動速度を検出し て、 その絶対値または変動により制御棒および駆動機構とその周囲の部材との摩 擦を測定することを特徴とする制御棒駆動装置の試験方法。 When the control rod is driven by driving the induction motor, the moving speed of the control rod is detected, and the friction between the control rod, the driving mechanism, and the surrounding members is measured based on the absolute value or the fluctuation. Characteristic test method for control rod drive.
9 . 誘導電動機を有するとともに前記誘導電動機が発生した駆動力を前記制 御棒に伝達して前記制御棒を昇降させる駆動機構を備えた制御棒駆動装置を試験 する試験方法であって、 9. A test method for testing a control rod driving device having an induction motor and having a drive mechanism for transmitting a driving force generated by the induction motor to the control rod and elevating the control rod,
前記誘導電動機を駆動して制御棒の駆動を行う際に前記誘導電動機に供給され る電流、 電圧または電力を検出して、 その絶対値または変動により制御棒および 駆動機構とその周囲の部材との摩擦を測定することを特徴とする制御棒駆動装置 の試験方法。 When the induction motor is driven to drive the control rod, current, voltage or power supplied to the induction motor is detected, and the absolute value or fluctuation of the control rod and the drive mechanism and the surrounding members is determined. A test method for a control rod drive, which comprises measuring friction.
1 0 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 10. A control rod drive device for driving a control rod of a reactor up and down,
電動機を有し、 前記電動機が発生した駆動力を前記制御棒に伝達して、 前記制 御棒を昇降させる駆動機構と、 A drive mechanism having an electric motor, transmitting a driving force generated by the electric motor to the control rod, and raising and lowering the control rod;
前記駆動機構に設けられ、 前記駆動機構の駆動力伝達部材に対して制動または 保持動作を行う第 1のブレーキおよび第 2のブレーキと、 A first brake and a second brake that are provided in the drive mechanism and perform a braking or holding operation on a driving force transmission member of the drive mechanism;
前記第 1および第 2のブレーキそれそれの静止時保持トルクを、 原子炉の通常 運転時の制御棒の位置保持に必要なトルク以上としたことを特徴とする、 制御棒 Wherein the first and second brakes each have a holding torque at rest which is equal to or greater than a torque required for holding the position of the control rod during normal operation of the reactor.
1 1 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 1 1. A control rod drive device for driving up and down control rods of a nuclear reactor,
電動機と磁気継手とを有し、 前記電動機が発生した駆動力を前記磁気継手を介 して制御棒に伝達して制御棒を昇降させる駆動機構と、 A drive mechanism having an electric motor and a magnetic coupling, transmitting a driving force generated by the electric motor to the control rod via the magnetic coupling, and raising and lowering the control rod;
前記電動機の軸、 前記電動機側の前記磁気継手の継手要素または前記電動機側 から前記磁気継手への駆動力伝達経路に設けられた部材の回転位置を検出する第 1の位置検出装置と、 A first position detection device that detects a rotation position of a shaft of the electric motor, a coupling element of the magnetic coupling on the electric motor side, or a member provided on a driving force transmission path from the electric motor side to the magnetic coupling;
前記制御棒側の前記磁気継手の継手要素または前記磁気継手から制御棒への駆 動力伝達経路に設けられた部材の位置を検出する第 2の位置検出装置と、 前記第 1および第 2の位置検出装置の出力を比較し、 前記第 1の位置検出装置
により検出された回転位置と第 2の位置検出装置により検出された位置との関係 が所定の関係から外れた場合に、 前記電動機への電力供給の停止、 前記関係が所 定の関係から外れた旨の表示、 および警報の発生のうち少なくとも 1つを実行す る制御装置と、 を備えたことを特徴とする制御棒駆動装置。 A second position detecting device for detecting a position of a coupling element of the magnetic coupling on the control rod side or a member provided on a driving power transmission path from the magnetic coupling to the control rod; and the first and second positions. Comparing the output of the detecting device, the first position detecting device When the relationship between the rotation position detected by the second position detection device and the position detected by the second position detection device deviates from a predetermined relationship, the power supply to the electric motor is stopped, and the relationship deviates from a predetermined relationship. And a control device that performs at least one of a display indicating that the alarm has occurred and an alarm.
1 2 . 電動機を含む電動機アセンブリと、 スプールピースと、 前記スプール ビースにより隔てられた一対の継手要素を有する磁気継手と、 を有するとともに、 前記電動機が発生した駆動力を前記磁気継手を介して制御棒に伝達して制御棒を 昇降させる駆動機構を備えた制御棒駆動装置の試験装置であって、 12. A motor assembly including a motor, a spool piece, and a magnetic coupling having a pair of coupling elements separated by the spool bead, and controlling a driving force generated by the motor via the magnetic coupling. A control rod driving device test device having a driving mechanism for transmitting a rod to a control rod to raise and lower the control rod,
前記スプールビースを前記駆動機構に取り付けた状態で、 前記磁気継手を構成 する前記電動機アセンブリ側の継手要素またはこの継手要素に接続された軸に対 してトルクを印加可能なトルク印加手段と、 Torque applying means capable of applying a torque to a joint element on the electric motor assembly side or a shaft connected to the joint element, which constitutes the magnetic joint, with the spool bead attached to the drive mechanism;
印加されたトルクを測定するトルク測定手段と、 Torque measuring means for measuring the applied torque;
を備えたことを特徴とする制御棒駆動装置の試験装置。 A test device for a control rod driving device, comprising:
1 3 . 電動機を含む電動機アセンブリと、 スプールビースと、 前記スプール ビースにより隔てられた一対の継手要素を有する磁気継手と、 前記電動機が発生 した回転運動を直線運動に変換するナツトおよびねじ軸とを有するボールねじ機 構と、 を有するとともに、 前記電動機が発生した駆動力を前記磁気継手および前 記ボールねじ機構を介して制御棒に伝達して制御棒を昇降させる駆動機構を備え た制御棒駆動装置を試験する方法であって、 13. An electric motor assembly including an electric motor, a spool bead, a magnetic coupling having a pair of joint elements separated by the spool bead, and a nut and a screw shaft for converting a rotational motion generated by the electric motor into a linear motion. A control rod drive having a ball screw mechanism having a driving mechanism for transmitting the driving force generated by the electric motor to the control rod via the magnetic coupling and the ball screw mechanism to raise and lower the control rod. A method of testing a device, comprising:
前記スプールビースを前記駆動機構に取り付けた状態で、 前記ナツトの位置を 機械的最下限状態または機械的最上限状態とし、 前記磁気継手を構成する前記電 動機アセンブリ側の継手要素またはこの継手要素に接続された軸に対してトルク を印加して、 前記磁気継手の異常の有無を判断することを特徴とする制御棒駆動 装置の試験方法。 In a state where the spool bead is attached to the drive mechanism, the position of the nut is set to a mechanical minimum state or a mechanical maximum state, and a coupling element on the motor assembly side or the coupling element constituting the magnetic coupling. A test method for a control rod driving device, comprising: applying torque to a connected shaft to determine whether or not the magnetic coupling is abnormal.
1 4 . 前記電動機アセンブリを前記駆動機構に取り付けた状態で、 前記電動 機ァセンブリの下部から前記電動機ァセンブリの軸を回転させ、 前記電動機ァセ ンブリの軸を介して前記電動機ァセンブリ側の継手要素またはこの継手要素に接 続された軸に対してトルクを印加することを特徴とする、 請求項 1 3に記載の制 御棒駆動装置の試験方法。
14. With the motor assembly attached to the drive mechanism, the shaft of the motor assembly is rotated from the lower portion of the motor assembly, and a coupling element on the motor assembly side via the shaft of the motor assembly or 14. The test method for a control rod drive according to claim 13, wherein a torque is applied to a shaft connected to the joint element.
1 5 . 電動機を含む電動機アセンブリと、 スプールビースと、 前記スプール ビースにより隔てられた一対の継手要素を有する磁気継手と、 を有するとともに、 前記電動機が発生した駆動力を前記磁気継手を介して制御棒に伝達して制御棒を 昇降させる駆動機構を備えた制御棒駆動装置の試験装置であって、 前記スプール ピースの試験を行う試験装置において、 15. An electric motor assembly including an electric motor, a spool bead, and a magnetic coupling having a pair of coupling elements separated by the spool bead, and a driving force generated by the electric motor is controlled via the magnetic coupling. A test device for a control rod drive device having a drive mechanism for transmitting a rod to raise and lower a control rod, wherein the test device performs a test of the spool piece.
前記スプールピースを前記駆動機構から取り外した状態で、 前記磁気継手を構 成する制御棒側の継手要素またはこの継手要素に接続された軸に接続可能であつ て、 制御棒側の継手要素またはこの継手要素に接続された軸の回転を拘束する回 転拘束手段と、 In a state where the spool piece is detached from the drive mechanism, the spool piece can be connected to a joint element on the control rod side or a shaft connected to the joint element, which constitutes the magnetic coupling, and a joint element on the control rod side or the joint element on the control rod side. Rotation restricting means for restricting rotation of a shaft connected to the joint element;
前記磁気継手を構成する前記電動機ァセンブリ側の継手要素またはこの継手要 素に接続された軸に接続可能であって、 前記電動機ァセンブリ側の継手要素また はこの継手要素に接続された軸にトルクを印加するトルク印加手段と、 It is connectable to a joint element on the electric motor assembly side or a shaft connected to the joint element, which constitutes the magnetic coupling, and applies torque to a joint element on the electric motor assembly side or a shaft connected to the joint element. Torque applying means for applying;
を備えたことを特徴とする制御棒駆動装置の試験装置。 A test device for a control rod driving device, comprising:
1 6 . 電動機を含む電動機アセンブリと、 スプールピースと、 前記スプール ビースにより隔てられた一対の継手要素を有する磁気継手と、 を有するとともに、 前記電動機が発生した駆動力を前記磁気継手を介して制御棒に伝達して制御棒を 昇降させる駆動機構を備えた制御棒駆動装置の試験装置であって、 前記スプール ピースの試験を行う試験装置において、 16. An electric motor assembly including an electric motor, a spool piece, and a magnetic coupling having a pair of coupling elements separated by the spool bead, and a driving force generated by the electric motor is controlled via the magnetic coupling. A test device for a control rod drive device having a drive mechanism for transmitting a rod to raise and lower a control rod, wherein the test device performs a test of the spool piece.
前記磁気継手を構成する制御棒側の継手要素またはこの継手要素に接続された 軸に接続可能であって、 制御棒側の継手要素またはこの継手要素に接続された軸 にトルクを印加するトルク印加手段と、 Torque application that is connectable to a control rod-side coupling element or a shaft connected to the coupling element that constitutes the magnetic coupling, and that applies torque to the control rod-side coupling element or a shaft connected to the coupling element Means,
前記磁気継手を構成する前記電動機アセンブリ側の継手要素またはこの継手要 素に接続された軸に接続可能であって、 前記電動機ァセンブリ側の継手要素また はこの継手要素に接続された軸の回転を拘束する回転拘束手段と、 It is connectable to a coupling element on the motor assembly side or a shaft connected to the coupling element, which constitutes the magnetic coupling, and controls rotation of the coupling element on the motor assembly side or a shaft connected to the coupling element. Rotation restraining means for restraining,
を備えたことを特徴とする制御棒駆動装置の試験装置。 A test device for a control rod driving device, comprising:
1 7 . 前記制御棒側の継手要素若しくはこの継手要素に接続された軸、 また は前記電動機ァセンブリ側の継手要素若しくはこの継手要素に接続された軸の一 方に接続可能であって、 前記トルク印加手段により印加されるトルクを制限する トルク制限器を更に備えたことを特徴とする、 請求項 1 5または 1 6に記載の制
御棒駆動装置の試験装置。 17. The joint element on the control rod side or a shaft connected to the joint element, or the joint element on the electric motor assembly side or a shaft connected to the joint element, and the torque 17. The control according to claim 15, further comprising a torque limiter for limiting a torque applied by the application unit. Test equipment for the rod drive device.
1 8 . 前記制御棒側の継手要素若しくはこの継手要素に接続された軸、 また は前記電動機アセンブリ側の継手要素若しくはこの継手要素に接続された軸の一 方に接続可能であって、 前記制御棒側の継手要素若しくはこの継手要素に接続さ れた軸、 または前記電動機ァセンブリ側の継手要素若しくはこの継手要素に接続 された軸の回転角度を測定する回転角測定手段を更に備えたことを特徴とする、 請求項 1 5または 1 6に記載の制御棒駆動装置の試験装置。 18. The control rod can be connected to one of a coupling element on the control rod side or a shaft connected to the coupling element, or a coupling element on the motor assembly side or a shaft connected to the coupling element. It further comprises a rotation angle measuring means for measuring a rotation angle of the rod-side joint element or a shaft connected to the joint element, or the electric motor assembly-side joint element or a shaft connected to the joint element. The test device for a control rod drive device according to claim 15 or 16, wherein:
1 9 . スプールピースの内部を加圧する圧力供給手段と、 スプールビースの 内部の圧力を測定する圧力測定手段と、 を更に備えたことを特徴とする、 請求項 1 5または 1 6に記載の制御棒駆動装置の試験装置。 19. The control according to claim 15, further comprising: pressure supply means for pressurizing the inside of the spool piece; and pressure measurement means for measuring the pressure inside the spool bead. Testing equipment for rod drives.
2 0 . 電動機を含む電動機アセンブリと、 スプールピースと、 前記スプール ピースにより隔てられた一対の継手要素を有する磁気継手と、 を有するとともに、 前記電動機が発生した駆動力を前記磁気継手を介して制御棒に伝達して制御棒を 昇降させる駆動機構を備えた制御棒駆動装置の点検装置であって、 20. An electric motor assembly including an electric motor, a spool piece, and a magnetic coupling having a pair of coupling elements separated by the spool piece, and a driving force generated by the electric motor is controlled via the magnetic coupling. An inspection device for a control rod drive device having a drive mechanism for transmitting the control rod to raise and lower the control rod,
前記磁気継手を構成する一方の継手要素またはこの継手要素に接続された軸の 位置を径方向に関して固定する第 1の径方向位置固定手段と、 First radial position fixing means for fixing the position of one of the joint elements constituting the magnetic joint or a shaft connected to the joint element in the radial direction,
前記磁気継手を構成する他方の継手要素またはこの継手要素に接続された軸の 位置を径方向に関して固定する第 2の径方向位置固定手段と、 を備え、 Second radial position fixing means for fixing the position of the other coupling element constituting the magnetic coupling or a shaft connected to the coupling element in the radial direction,
前記スプールビース及び前記各継手要素の軸線を固定した状態で、 スプールピ —スの分解あるいは組立を実施することを特徴とする制御棒駆動装置の点検装置 c Inspection device ( c) for a control rod drive device, wherein disassembly or assembly of a spool piece is performed with the axis of the spool bead and each joint element fixed.
2 1 . 複数の磁石を内蔵するとともに第 1の軸に接続された第 1の継手要素 と、 複数の磁石を内蔵するとともに第 2の軸に接続された第 2の継手要素と、 を 含む磁気継手を有するトルク伝達装置において、 2 1. A magnetic field including: a first joint element containing a plurality of magnets and connected to a first shaft; and a second joint element containing a plurality of magnets and connected to a second shaft. In a torque transmission device having a joint,
前記第 1の継手要素の全ての磁石を水密または気密に覆う第 1の外被と、 前記 第 2の継手要素の全ての磁石を水密または気密に覆う第 2の外被と、 を備え、 更に、 前記第 1の外被の内側において前記第 1の継手要素に内蔵された磁石の 一部若しくは全部を水密または気密に覆う第 3の外被と、 前記第 2の外被の内側 において前記第 2の継手要素に内蔵された磁石の一部あるいは全部を水密または 気密に覆う第 4の外被と、 のうち少なくともいずれか一方を備えたことを特徴と
する、 磁気继手を有するトルク伝達装置。 A first jacket that covers all magnets of the first joint element in a water-tight or air-tight manner, and a second jacket that covers all magnets of the second joint element in a water-tight or air-tight manner. A third jacket that water-tightly or air-tightly covers a part or the whole of a magnet built in the first joint element inside the first jacket, and a third jacket inside the second jacket. And a fourth jacket that water-tightly or air-tightly covers a part or the whole of the magnet built in the joint element of (2). A torque transmitting device having a magnetic arm.
2 2 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 2 2. A control rod drive device for driving a control rod of a reactor up and down,
電動機と、 請求項 2 1に記載のトルク伝達装置と、 を有し、 前記電動機が発生 した駆動力を前記トルク伝達装置を介して制御棒に伝達して制御棒を昇降させる 駆動機構と、 を備えたことを特徴とする制御棒駆動装置。 A drive mechanism, comprising: an electric motor; and the torque transmission device according to claim 21, wherein the drive mechanism transmits the driving force generated by the electric motor to the control rod via the torque transmission device to raise and lower the control rod. A control rod driving device, comprising:
2 3 . 原子炉の制御棒を昇降駆動する制御棒駆動装置であって、 2 3. A control rod drive device for driving up and down a control rod of a nuclear reactor,
電動機と、 請求項 2 1に記載のトルク伝達装置とを有し、 前記電動機が発生し た駆動力を前記トルク伝達装置を介して制御棒に伝達して制御棒を昇降させる駆 動機構を備え、 An electric motor, comprising: the torque transmission device according to claim 21; and a drive mechanism that transmits a driving force generated by the electric motor to a control rod via the torque transmission device to move the control rod up and down. ,
スプールビース隔壁内部に前記トルク伝達装置の第 1の継手要素が設置され、 スプールビース隔壁外部に前記トルク伝達装置の第 2の継手要素が設置され、 前記第 1の継手要素のうち第 3の外被に覆われた磁石が機能し、 前記第 1の継 手要素の第 3の外被に覆われていない磁石が機能しない状態において、 原子炉の 通常運転時の制御棒位置保持に必要なトルク以上の最大伝達トルクを前記トルク 伝達装置が有していることを特徴とする制御棒駆動装置。
A first coupling element of the torque transmission device is installed inside the spool bead partition, a second coupling element of the torque transmission device is installed outside the spool bead partition, and a third external component of the first coupling element is provided. The torque required to maintain the control rod position during normal operation of the reactor in a state where the magnet covered by the cover functions and the magnet not covered by the third cover of the first joint element does not function. A control rod driving device, wherein the torque transmission device has the maximum transmission torque described above.
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FI20011107A FI120924B (en) | 1999-09-29 | 2001-05-28 | Joystick actuator |
FI20070349A FI20070349L (en) | 1999-09-29 | 2007-05-02 | Actuator for control rod, test method and test device therefor and torque transmission device |
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JP27748999A JP2001099974A (en) | 1999-09-29 | 1999-09-29 | Control rod driving device, its operating method, its testing method and testing device, its inspecting device, its storing method and storing device, and torque transmission device and its testing method |
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CN105654678A (en) * | 2016-01-29 | 2016-06-08 | 上海华岭集成电路技术股份有限公司 | Automatic monitoring device for state of test equipment |
CN111458386A (en) * | 2020-04-07 | 2020-07-28 | 九江学院 | High-pressure photoelectrochemistry in-situ reaction device |
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US6650722B1 (en) * | 2001-12-21 | 2003-11-18 | General Electric Company | Hydraulic control unit transponder card |
KR101121515B1 (en) | 2010-12-28 | 2012-02-28 | 두산중공업 주식회사 | Friction test gauge for control-rod guide tube |
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KR101234550B1 (en) * | 2011-10-13 | 2013-02-19 | 한국원자력연구원 | Apparatus for controlling control absorber rod for nuclear reactor and method thereof |
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CN105004512B (en) * | 2014-04-18 | 2018-10-16 | 中广核研究院有限公司 | Control rod drive mechanism testing stand |
CN110168666B (en) | 2016-12-30 | 2023-11-10 | 纽斯高动力有限责任公司 | control rod damping system |
CN110253480B (en) * | 2019-06-26 | 2020-12-04 | 中国核动力研究设计院 | Mounting tool for welding seam sealing device of control rod driving mechanism |
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- 2000-09-29 CN CNA2005100067407A patent/CN1645520A/en active Pending
- 2000-09-29 WO PCT/JP2000/006785 patent/WO2001024197A1/en active Application Filing
- 2000-09-29 CN CN2006101416630A patent/CN101110279B/en not_active Expired - Fee Related
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CN101840737B (en) * | 2009-09-02 | 2012-10-31 | 中广核工程有限公司 | Digital rod position control system and method |
CN105654678A (en) * | 2016-01-29 | 2016-06-08 | 上海华岭集成电路技术股份有限公司 | Automatic monitoring device for state of test equipment |
CN111458386A (en) * | 2020-04-07 | 2020-07-28 | 九江学院 | High-pressure photoelectrochemistry in-situ reaction device |
CN111458386B (en) * | 2020-04-07 | 2022-11-18 | 九江学院 | High-pressure photoelectrochemistry in-situ reaction device |
Also Published As
Publication number | Publication date |
---|---|
JP2001099974A (en) | 2001-04-13 |
CN1322361A (en) | 2001-11-14 |
CN1645520A (en) | 2005-07-27 |
CN100468580C (en) | 2009-03-11 |
CN101110279B (en) | 2011-08-03 |
FI20070349L (en) | 2007-05-02 |
CN101110279A (en) | 2008-01-23 |
FI20011107A (en) | 2001-05-28 |
FI120924B (en) | 2010-04-30 |
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