JP7201630B2 - Valve drive system and emergency condensate system - Google Patents

Description

The present invention relates to valve drive systems and emergency condensate systems.

An emergency condensate system equipped with an isolation condenser (IC) is known as one of static reactor cooling systems in nuclear power plants.
As an example, in claim 1 of Patent Document 1 below, "a reactor pressure vessel, a steam lead-in pipe for extracting steam from the reactor pressure vessel, and a steam condensate for condensing the steam introduced from the steam lead-in pipe. a heat transfer tube, a condensed water return tube connected to the steam condensing heat transfer tube to return condensed water in the steam condensing heat transfer tube to the reactor pressure vessel, and water stored therein to return the steam condensing heat transfer tube to the water. In the emergency condensate system of a nuclear power plant with a heat transfer tube cooling pool installed in
At least one condensate valve is installed on the condensate return line, and the condensate valve is affected by changes in pressure or water level in the reactor pressure vessel due to shifts of the reactor pressure vessel from normal operating conditions. An emergency condensate system for a nuclear power plant, wherein the pressure applied to the condensate valve opens according to a change without using external power. ” is stated. In addition, Patent Documents 2 to 6 also describe techniques related to emergency condensate systems. The descriptions of these documents are incorporated as part of the present specification.

Japanese Patent No. 5562626 Japanese Patent No. 6359318 Japanese Patent No. 5798473 Japanese Patent No. 5526094 Japanese Patent No. 5373213 Japanese Patent No. 5781575

By the way, in each technique described above, there is a demand to drive the valve more appropriately.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve drive system and an emergency condensate system capable of appropriately driving valves.

In order to solve the above problems, the valve drive system of the present invention includes: a gas operated valve that forms a fluid flow path when a gas having a pressure equal to or higher than a first predetermined pressure is supplied to a first pipe; a first gas supply source that generates a gas having a predetermined pressure or more; a rupture disk that, when ruptured, forms a path for supplying the gas that has flowed in from the first gas supply source to a second pipe; When the gas is supplied from the first gas supply source to the second pipe, a switching valve that connects the first pipe and the second pipe, and the pressure of the fluid reaches a second predetermined pressure. and a breaking operation part for breaking the rupture disk when exceeded.

According to the present invention, the valve can be properly driven.

1 is a block diagram of a valve actuation system according to a first preferred embodiment; FIG. 4 is another block diagram of the valve drive system according to the first embodiment; FIG. FIG. 4 is a block diagram of a valve actuation system according to a second preferred embodiment; FIG. 8 is another block diagram of the valve drive system according to the second embodiment; FIG. 11 is a block diagram of a valve actuation system according to a third preferred embodiment; FIG. 4 is a block diagram of an emergency condensate system according to a fourth preferred embodiment; FIG. 3 is a block diagram of an emergency condensate system according to a comparative example;

[First embodiment]
FIG. 1 is a block diagram of a valve drive system S1 according to a first preferred embodiment.
In FIG. 1, the valve drive system S1 includes a switching valve 21, a rupture disk 30, a fluid pressure converter 23 (breaking operation section), check valves 42 and 44 (first gas supply source), and a high-pressure gas generator. 50 (first gas supply source), gas accumulator 60 (first gas supply source), air operated valve 71, fluid supply source 80, piping 102, 108, piping 104 (second piping ) and a pipe 106 (first pipe). The high-pressure gas generator 50 generates a high-pressure gas G1 (gas, for example, compressed air), and accumulates the generated high-pressure gas G1 in the gas pressure accumulator 60 via the check valve 44 .

Fluid supply 80 supplies fluid F1 (eg, water or steam) to line 102 . The fluid pressure converter 23 provides continuity between the check valve 42 and the rupture disk 30 . If the rupture disk 30 is not broken, the high pressure gas G1 is blocked here and the high pressure gas G1 is not supplied to the pipe 104 . Further, the fluid pressure converter 23 breaks the rupture disk 30 when the pressure of the fluid F1 in the pipe 102 reaches or exceeds a predetermined pressure PF (not shown).

When the rupture disk 30 breaks, the pipe 104 is supplied with the high pressure gas G1. The switching valve 21 makes the pipes 104 and 106 conductive when a gas of a predetermined pressure PG (not shown) or more is supplied to the pipe 104, and shuts off the pipes 104 and 106 otherwise. Since the pressure of the high-pressure gas G1 is sufficiently higher than the predetermined pressure PG, when the high-pressure gas G1 is supplied to the pipe 104, the switching valve 21 causes the pipes 104 and 106 to conduct, whereby the high-pressure gas G1 is supplied to pipe 106 .

The air-operated valve 71 makes the pipes 102 and 108 conductive when the gas above the predetermined pressure PG is supplied to the pipe 106 via the switching valve 21, and otherwise shuts off the pipes 102 and 108. do. Therefore, when the high-pressure gas G1 is supplied to the pipe 106, the air operated valve 71 makes the pipes 102 and 108 conductive. In FIG. 1, if the pressure of the fluid F1 is less than the predetermined pressure PF, the rupture disk 30 remains unbroken. become non-conducting. Therefore, the pipes 102 and 108 are also disconnected.

FIG. 2 is a block diagram of the valve drive system S1 when the pressure of the fluid F1 reaches or exceeds the predetermined pressure PF.
As described above, the fluid pressure converter 23 breaks the rupture disk 30 when the pressure of the fluid F1 reaches or exceeds the predetermined pressure PF. The shape of the rupture disk 30 shown in FIG. 2 schematically shows that it is in a broken state. When the rupture disk 30 is broken, the high-pressure gas G1 is supplied to the pipe 104 through the fluid pressure converter 23 and the rupture disk 30, thereby causing the switching valve 21 to make the pipes 104 and 106 conductive. When the pipes 104 and 106 are electrically connected, the high pressure gas G1 is supplied to the pipe 106, so the air operated valve 71 allows the pipes 102 and 108 to be electrically connected. Thereby, the fluid F1 is discharged through the pipes 102,108.

Here, it is assumed that the pressure of the fluid F1 drops below the predetermined pressure PF after the rupture disk 30 breaks. In this case, since the rupture disk 30 has already broken, the high-pressure gas generator 50 continues to generate the high-pressure gas G1 unless power loss occurs in the valve drive system S1. Therefore, the high-pressure gas G1 continues to be supplied to the pipes 104 and 106, the pipes 102 and 108 are also kept in a conducting state, and the fluid F1 can be continuously supplied to the pipe 108. Further, even if the valve drive system S1 loses power, the high-pressure gas G1 is accumulated in the gas pressure accumulator 60, so that the pipes 102 and 108 are maintained in a conductive state for a considerable long time. be able to.

[Second embodiment]
FIG. 3 is a block diagram of a valve drive system S2 according to a second preferred embodiment. In addition, in the following description, the same code|symbol may be attached|subjected to the part corresponding to each part of 1st Embodiment mentioned above, and the description may be abbreviate|omitted.
In FIG. 3, the valve drive system S2 includes, in addition to the configuration corresponding to each part of the first embodiment (see FIG. 1), an electromagnetic valve 20, a check valve 45 (second gas supply source), a high-pressure gas Generator 52 (second gas supply source), gas pressure accumulator 61 (second gas supply source), remote manual switch 90 (hereinafter sometimes referred to as switch 90), and pipe 112 (first piping) and piping 110, 114.

The switch 90 is a switch that is turned on/off by a user's manual operation. When the switch 90 is turned on, it supplies a predetermined current to the solenoid valve 20, and when it is turned off, the current supply is stopped. The high-pressure gas generator 52 generates a high-pressure gas G2 (gas, for example, compressed air) having a pressure equivalent to that of the high-pressure gas G1. 61. The gas pressure accumulator 61 supplies the accumulated high pressure gas G2 to the pipe 114 . As a result, even if the high-pressure gas generator 52 malfunctions or loses power, the high-pressure gas G2 is accumulated in the gas pressure accumulator 61, so that the high-pressure gas G2 remains in the pipe 114 for a considerable long time. G2 can continue to be supplied. When a predetermined current is supplied from the switch 90, the electromagnetic valve 20 makes the pipes 112 and 114 conductive and cuts off the pipe 110 from both. On the other hand, when the switch 90 does not supply the predetermined current, the solenoid valve 20 makes the pipes 110 and 112 conductive and cuts off the pipe 114 from both.

Further, the air-operated valve 71 in this embodiment makes the pipes 102 and 108 conductive when the high-pressure gas G1 or G2 is supplied to the pipe 112, and shuts off the pipes 102 and 108 in other cases. The state shown in FIG. 3 assumes that the switch 90 is in the OFF state. In this case, since the pipes 110 and 112 are connected via the electromagnetic valve 20, the valve drive system S2 operates in the same manner as the valve drive system S1 (see FIGS. 1 and 2) of the first embodiment.

FIG. 4 is a block diagram of the valve drive system S2 when the remote manual switch 90 is on.
As described above, when the switch 90 is turned on, the pipes 112, 114 are electrically connected. As a result, the high-pressure gas G2 generated by the high-pressure gas generator 52 is sequentially supplied to the air-operated valve 71 through the pipes 114 and 112 . As a result, the air-operated valve 71 allows the pipes 102 and 108 to conduct and supplies the fluid F1 to the pipe 108 .

[Third Embodiment]
FIG. 5 is a block diagram of a valve drive system S3 according to a third preferred embodiment. In the following description, portions corresponding to those of the other embodiments described above are denoted by the same reference numerals, and description thereof may be omitted.
In FIG. 5, the valve drive system S3 includes, in addition to the configuration corresponding to each part of the second embodiment (see FIG. 3), an explosion valve 28, check valves 46 and 48 (third gas supply source), A high-pressure gas generator 54 (third gas supply source), a gas pressure accumulator 62 (third gas supply source), and a pipe 116 are provided.

The high-pressure gas generator 54 generates high-pressure gas G3 (gas, for example, compressed air), and accumulates the generated high-pressure gas G3 in the gas pressure accumulator 62 via the check valve 48 . The high pressure gas G3 also has the same pressure as the high pressure gas G1. The detonation valve 28 is configured to operate when a predetermined current is supplied by user manipulation. The blast valve 28 provides isolation between the gas accumulator 62 and the check valve 46 when not actuated, and provides communication between the gas accumulator 62 and the check valve 46 when actuated. A pipe 116 connects the switching valve 21, the rupture disk 30, and the check valve 46 to each other.

Since the high-pressure gas G3 is not supplied to the pipe 116 when the blast valve 28 is not activated, the valve drive system S3 operates in the same manner as the valve drive system S2 of the second embodiment (see FIGS. 3 and 4). On the other hand, when the explosion valve 28 is actuated, the high pressure gas G3 is supplied to the pipe 116, and the switching valve 21 makes the pipes 110 and 116 conductive. Here, if the switch 90 is in the OFF state, the electromagnetic valve 20 conducts the pipes 110 and 112, so the high-pressure gas G3 supplied to the pipe 116 is supplied to the pipe 112 via the pipe 110, thereby The operating valve 71 makes the pipes 102 and 108 conductive.

In this state, the high-pressure gas generator 54 continues to generate the high-pressure gas G3 unless power loss occurs in the valve drive system S3. Therefore, the high-pressure gas G3 continues to be supplied to the pipe 112, the pipes 102 and 108 are kept in a conductive state, and the fluid F1 can be continuously supplied to the pipe 108. In addition, even if the valve driving system S3 loses power, the high-pressure gas G3 is accumulated in the gas pressure accumulator 62, so that the pipes 102 and 108 are maintained in a conductive state for a considerable long time. be able to.

[Fourth embodiment]
FIG. 6 is a block diagram of an emergency condensate system S4 according to a fourth preferred embodiment. In the following description, portions corresponding to those of the other embodiments described above are denoted by the same reference numerals, and description thereof may be omitted.
6, the emergency condensate system S4 includes a reactor pressure vessel 150, a heat transfer tube cooling pool 160, a steam condensation heat transfer tube 162, in addition to the configuration corresponding to each part of the third embodiment (see FIG. 5). , and piping 122 , 124 , 126 .

The heat transfer tube cooling pool 160 contains steam condensation heat transfer tubes 162 and cooling water (not labeled) for cooling them. Inside the reactor pressure vessel 150, a nuclear fission reaction occurs to heat the fluid F1, which is the coolant. The pressure of the fluid F1 is then transmitted to the fluid pressure converter 23 via the pipe 122 .

When the pressure of the fluid F1 reaches or exceeds a predetermined pressure PF (not shown), the fluid pressure converter 23 causes the rupture disk 30 to break. As a result, the high-pressure gas G1 is sequentially supplied to the pipe 112 through the pipes 116 and 110, and the air operated valve 71 makes the pipes 108 and 126 conductive. When the pipes 108 and 126 are connected, the reactor pressure vessel 150 and the steam condensing heat transfer pipe 162 are circularly connected via the pipes 108 , 124 and 126 .

This allows steam condensing heat transfer tubes 162 to cool fluid F 1 back to reactor pressure vessel 150 . In other words, steam condensing heat transfer tube 162 and piping 108 , 124 , 126 function as an emergency condensate system for reactor pressure vessel 150 . Also in this embodiment, similarly to the valve drive system S3 of the third embodiment, when the user turns on the remote manual switch 90 or operates the explosion valve 28, the high pressure gas G2 is supplied to the pipe 112. Alternatively, G3 can be supplied to operate the pneumatically operated valve 71 and connect the pipes 108 and 126 . Thus, in this embodiment, the pipes 108 and 126 can be electrically connected by various methods.

[Comparative example]
Next, a comparative example will be described in order to clarify the effects of the preferred embodiment.
FIG. 7 is a block diagram of an emergency condensate system SC according to a comparative example. In the following description, portions corresponding to those of the other embodiments described above are denoted by the same reference numerals, and description thereof may be omitted.
7, the emergency condensate system SC includes a reactor pressure vessel 150, a heat transfer tube cooling pool 160, a steam lead-in pipe 130, a condensed water return pipe 132, a condensate valve 7, and an operation signal transmitter 8. , a condensate valve driving unit 9 , a power source equipment 10 , a pressure gauge 11 , and a water level gauge 12 . The dashed lines in FIG. 7 indicate paths of electric signals and the like.

In FIG. 7, a steam lead-in pipe 130 is connected to the reactor pressure vessel 150 above the normal water level LVR. A condensed water return pipe 132 is connected to the reactor pressure vessel 150 below the normal water level LVR. The steam lead-in pipe 130 and the condensed water return pipe 132 are connected to the steam condensation heat transfer pipe 162 . A condensate valve 7, which is an electromagnetic valve, is inserted in the middle of the condensed water return pipe 132. As shown in FIG.

The steam flowing inside the steam condensing heat transfer tube 162 is cooled and condensed by the cooling water (not numbered) in the heat transfer tube cooling pool 160 . Let LV be the water level caused by condensation. The water level LV is higher than the water level LVR in the reactor pressure vessel 150 . The pressure gauge 11 measures the pressure inside the reactor pressure vessel 150 . Also, the water level gauge 12 measures the water level LVR in the reactor pressure vessel 150 . The actuation signal transmitting section 8 transmits an actuation signal to the condensate valve driving section 9 when the pressure inside the reactor pressure vessel 150 rises above a predetermined pressure or the water level LVR falls below a predetermined water level.

Upon receiving the actuation signal from the actuation signal transmitter 8, the condensate valve drive unit 9 supplies a predetermined current to the condensate valve 7 to bring the condensed water return pipe 132 into a conducting state. As a result, the steam lead-in pipe 130, the condensed water return pipe 132, and the steam condensation heat transfer pipe 162 function as an emergency condensate system. The power supply facility 10 includes a battery (not shown) and the like, and supplies power to the operation signal transmitter 8, the condensate valve driver 9, and the like even when commercial power is lost. However, if the power source of the power supply facility 10 is lost due to a factor such as a fire, the condensate valve driving section 9 cannot supply current to the condensate valve 7 .

As a result, the condensate valve 7 is closed, and there is a problem that the steam condensation heat transfer pipe 162 and the like do not function as an emergency condensate system. In the above example, the condensate valve 7 was a solenoid valve, but an air operated valve operated with compressed nitrogen or compressed air can be applied as the condensate valve 7 . In this case, the condensate valve drive unit 9 supplies compressed nitrogen or compressed air to the condensate valve 7 upon receiving the actuation signal from the actuation signal transmitter 8 to bring the condensate valve 7 into a conductive state. In this case as well, if the power supply of the power supply equipment 10 is lost due to a factor such as a fire, the condensate valve drive unit 9 cannot supply compressed nitrogen or compressed air to the condensate valve 7, so the condensate valve 7 is also closed. become.

[Effects of Embodiment]
As described above, according to the preferred embodiment, the valve drive system is configured such that when gas (G1) having a pressure equal to or higher than the first predetermined pressure (PG) is supplied to the first pipes (106, 112), , a gas-operated valve (71) forming a flow path for the fluid F1, and a first gas supply source (42, 44, 50, 60) for generating a gas (G1) having a first predetermined pressure (PG) or higher. , a rupture disk 30 that, when broken, forms a path for supplying the gas (G1) flowing from the first gas supply source (42, 44, 50, 60) to the second pipe (104); When the gas (G1) is supplied to the pipe (104) from the first gas supply source (42, 44, 50, 60), the first pipe (106, 112) and the second pipe (104) are connected. It comprises a switch valve 21 for conducting, and a breaking operation part (23) for breaking the rupture disk 30 when the pressure of the fluid F1 exceeds a second predetermined pressure (PF). As a result, the rupture disk 30 can be broken by the pressure of the fluid F1, the gas (G1) can be supplied to the gas-operated valve (71), and the gas-operated valve (71) can be appropriately driven.

Further, the valve driving system includes a second gas supply source (45, 52, 61) for generating a gas (G2) having a first predetermined pressure (PG) or more, a switching valve 21 and a first pipe (106, 112) and forms a path for supplying gas (G2) from the second gas supply source (45, 52, 61) to the gas operated valve (71) when a predetermined current is supplied. A solenoid valve 20 is preferably further provided. As a result, a path for supplying the gas (G2) to the gas-operated valve (71) can be electrically formed, and the gas-operated valve (71) can be driven more appropriately.

The valve drive system also includes a third gas supply (46, 48, 54, 62) generating a gas (G3) above a first predetermined pressure (PG) and, when actuated, the third gas supply. A blast valve 28 forming a flow path for supplying gas (G3) from the source (46, 48, 54, 62) toward the switching valve 21 is preferably further provided. Thereby, the gas (G3) can be supplied from the third gas supply source (46, 48, 54, 62) toward the switching valve 21, and the gas operated valve (71) can be driven more appropriately.

The emergency condensate system further comprises a reactor pressure vessel 150, a steam condensing heat transfer tube 162, a heat transfer tube cooling pool 160 for cooling the steam condensing heat transfer tube 162, and the gas operated valve (71) When gas (G1, G2, G3) having a pressure equal to or higher than the first predetermined pressure (PG) is supplied to the first pipe (112), the pressure between the reactor pressure vessel 150 and the steam condensation heat transfer tube 162 is It is preferable to form a circulation path for circulating the fluid F1. This allows the steam condensation heat transfer pipe 162 and the like to function as an emergency condensate system.

[Modification]
The present invention is not limited to the embodiments described above, and various modifications are possible. The above-described embodiments are illustrated for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Also, it is possible to delete part of the configuration of each embodiment, or to add or replace other configurations. Also, the control lines and information lines shown in the drawings are those considered to be necessary for explanation, and do not necessarily show all the control lines and information lines necessary on the product. In practice, it may be considered that almost all configurations are interconnected. Possible modifications to the above embodiment are, for example, the following.

(1) In the fourth embodiment described above, an example in which the valve drive systems S1 to S3 of the first to third embodiments are applied to the emergency condensate system S4 of the reactor pressure vessel 150 has been described. However, the valve drive systems S1 to S3 may be applied to various facilities without being limited to the emergency condensate system.

(2) In the fourth embodiment described above, the pipe 122 connects the reactor pressure vessel 150 and the fluid pressure converter 23 . Alternatively, however, pipe 126 may be provided with a branch (not shown), and pipe 122 may connect this branch to fluid pressure converter 23 . Thus, according to the configuration in which the pipe 122 connects the pipe 126 and the fluid pressure converter 23, the influence of hydrogen, oxygen, etc. in the reactor pressure vessel 150 on the fluid pressure converter 23 can be reduced.

20 Solenoid valve 21 Switching valve 23 Fluid pressure converter (breaking operation unit)
28 explosion valve 30 rupture discs 42, 44 check valve (first gas supply source)
45 check valve (second gas supply source)
46, 48 check valve (third gas supply source)
50 high-pressure gas generator (first gas supply source)
52 high-pressure gas generator (second gas supply source)
54 high-pressure gas generator (third gas supply source)
60 gas pressure accumulator (first gas supply source)
61 gas pressure accumulator (second gas supply source)
62 Gas pressure accumulator (third gas supply source)
71 air operated valve (gas operated valve)
104 piping (second piping)
106, 112 piping (first piping)
150 Reactor pressure vessel 160 Heat transfer tube cooling pool 162 Steam condensation heat transfer tube F1 Fluid G1, G2, G3 High pressure gas (gas)
PG predetermined pressure (first predetermined pressure)
PF Predetermined pressure (second predetermined pressure)
S1, S2, S3 Valve drive system S4 Emergency condensate system

Claims (4)

a gas operated valve that forms a fluid flow path when a gas having a pressure equal to or higher than a first predetermined pressure is supplied to the first pipe;
a first gas supply source that generates a gas having a pressure equal to or higher than the first predetermined pressure;
a rupture disk that, when ruptured, forms a path for supplying the gas that has flowed in from the first gas supply source to the second pipe;
a switching valve that connects the first pipe and the second pipe when gas is supplied from the first gas supply source to the second pipe;
A valve drive system comprising: a breakage operation section that breaks the rupture disk when the pressure of the fluid exceeds a second predetermined pressure. a second gas supply source that generates a gas having a pressure equal to or higher than the first predetermined pressure;
an electromagnetic valve that is inserted between the switching valve and the first pipe and forms a path for supplying gas from the second gas supply source to the gas operated valve when a predetermined current is supplied; 2. The valve actuation system of claim 1, further comprising: a. a third gas supply source that generates a gas having a pressure equal to or higher than the first predetermined pressure;
3. The valve drive system of claim 2, further comprising a blast valve that, when actuated, forms a flow path that supplies gas from the third gas supply toward the switching valve. a gas operated valve that forms a fluid flow path when a gas having a pressure equal to or higher than a first predetermined pressure is supplied to the first pipe;
a first gas supply source that generates a gas having a pressure equal to or higher than the first predetermined pressure;
a rupture disk that, when ruptured, forms a path for supplying the gas that has flowed in from the first gas supply source to the second pipe;
a switching valve that connects the first pipe and the second pipe when gas is supplied from the first gas supply source to the second pipe;
a breaking operation part for breaking the rupture disk when the pressure of the fluid exceeds a second predetermined pressure;
a second gas supply source that generates a gas having a pressure equal to or higher than the first predetermined pressure;
an electromagnetic valve that is inserted between the switching valve and the first pipe and forms a path for supplying gas from the second gas supply source to the gas operated valve when a predetermined current is supplied;
a third gas supply source that generates a gas having a pressure equal to or higher than the first predetermined pressure;
a blast valve that, when actuated, forms a flow path that supplies gas from the third gas supply toward the switching valve;
a reactor pressure vessel;
a steam condensing heat transfer tube;
a heat transfer tube cooling pool that cools the steam condensing heat transfer tube,
The gas-operated valve circulates the fluid between the reactor pressure vessel and the steam condensing heat transfer pipe when gas having a pressure equal to or higher than the first predetermined pressure is supplied to the first pipe. An emergency condensate system characterized by forming a distribution channel.

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