JP5191505B2 - Radiation measurement equipment - Google Patents

Description

  The present invention relates to a radiation measuring apparatus that samples exhaust gas passing through an exhaust pipe installed in a nuclear power plant and measures radiation generated from a radioactive substance contained in the exhaust gas.

  Conventionally, an exhaust cylinder installed in a nuclear power plant is provided with an isokinetic probe (hereinafter abbreviated as IKP) for sucking exhaust gas. This IKP has a plurality of nozzles (2 to 5) for sampling the exhaust gas passing through the exhaust pipe. A part of the exhaust gas is sampled by IKP and guided to a radiation detector to measure the radiation of the radioactive substance contained in the exhaust gas. As a conventional technique related to an isokinetic probe (IKP), a technique described in Patent Document 1 has been proposed.

JP 63-179232 A

  By the way, at present, only one IKP is inserted into the exhaust pipe. The reason why only one of these nozzles is inserted is that a measurement method in exhaust gas has conventionally been defined, and according to the definition, the number of sampling nozzles is not defined.

  However, if the IKP is used for a certain period of time, the IKP may be clogged, so it is necessary to check the IKP. Here, when there is only one IKP, it is impossible to measure the radiation in the exhaust gas passing through the exhaust pipe until the IKP inspection work is completed, that is, a missing measurement always occurs. If a missing measurement occurs, the reason will be explained. In this case, the occurrence of an event that requires inspection work at the nuclear power plant has caused a major problem at the nuclear power plant. It seems to have occurred, and as a result, it may become a social problem. For this reason, it is desirable to maintain a state in which radiation in exhaust gas passing through the exhaust pipe is continuously measured without missing measurement.

  It is an object of the present invention to provide a radiation measuring apparatus that solves such problems and realizes inspection of IKP without missing measurement.

  In order to achieve the above object, the present invention has the following configuration.

(1) In the radiation measuring apparatus for measuring radiation in the exhaust pipe, a first probe having a plurality of nozzles disposed in the exhaust pipe and sucking a part of the exhaust gas in the exhaust pipe, from the first probe A first sampling pipe for guiding the sucked exhaust gas to the outside of the exhaust pipe; a first sampling means connected to the first sampling pipe for collecting a part of the exhaust gas introduced from the first sampling pipe; and A first radiation measuring unit provided with a first radiation detecting means for detecting radiation of the exhaust gas collected by the first sampling means, and a plurality of nozzles arranged in the exhaust pipe and for sucking the exhaust gas in the exhaust pipe. A second probe having a second sampling pipe for guiding the exhaust gas sucked from the second probe to the outside of the exhaust pipe, and connected to the second sampling pipe. The second radiation having the second sampling means for collecting a part of the exhaust gas introduced from the second sampling pipe and the second radiation detection means for detecting the radiation of the exhaust gas collected by the second sampling means. and a measurement unit, the first radiation measurement portion and the second radiation measurement portion are each independently have line detection of radiation, wherein the first sampling pipe and the second sampling tube, spaced from each other vital A radiation measuring apparatus, wherein the radiation measuring apparatus passes another route along the outer wall of the exhaust pipe .

  According to (1), for example, when inspecting the first probe (first IKP 50), the first radiation measurement unit (first radiation measurement unit 100a) is stopped, and the first probe is pulled out for inspection. While the first radiation measurement unit is stopped, the radiation is measured by the second radiation measurement unit. As a result, no missing measurement period occurs when the probe is inspected, and the continuity of radiation measurement in the exhaust stack is maintained.

Further , according to (1 ), since the first sampling pipe and the second sampling pipe are piped by different routes apart from each other, the first sampling pipe and the second sampling pipe are corroded simultaneously. It becomes possible to avoid. As a result, when it is necessary to replace either the first sampling tube or the second sampling tube, the radiation measuring unit having the sampling tube to be replaced is stopped. Measure radiation. As a result, no missing measurement period occurs when the sampling tube is replaced, and the continuity of radiation measurement in the exhaust stack is maintained.

(2) (1) to Oite, the first probe and the second probe, the exhaust cylinder when viewed in plan, a radiation measuring device, characterized in that arranged in a cross shape.

According to ( 2 ), since the first probe and the second probe are arranged in a cross shape when the inside of the exhaust pipe is viewed in plan, the exhaust gas can be sampled in a wide range in the exhaust pipe. become. This makes it possible to perform highly accurate radiation measurement.

( 3 ) In (1) or (2) , the first radiation measurement unit displays a first data processing means for analyzing a detection result of the first radiation detection means, and an analysis result of the first data processing means. A second display unit for displaying the analysis result of the second data processing unit, and a second data processing unit for analyzing the detection result of the second radiation detection unit. A radiation measuring apparatus having a display means.

According to ( 3 ), since the first radiation measurement unit and the second radiation measurement unit are completely independent and duplicated, the first radiation measurement unit and the second radiation measurement unit are inspected without interfering with each other.・ Measurement is possible.

  According to the present invention, when the probe is inspected, the missing measurement period does not occur, and the continuity of radiation measurement in the exhaust stack is maintained.

It is explanatory drawing which shows the system configuration | structure of the nuclear power plant provided with the radiation measuring device of one Embodiment of this invention. It is a top view of an exhaust pipe. It is a block diagram which shows the structure of the radiation measuring device in one Embodiment of this invention. It is a block diagram which shows the structure of the radiation measuring device in other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram showing a system configuration of a nuclear power plant provided with a radiation measuring apparatus according to an embodiment of the present invention. The nuclear power plant is provided with a nuclear reactor facility 10, a turbine facility 20, an exhaust stack 30, and the like. A nuclear reactor 12 is provided in the nuclear reactor facility 10. The turbine facility 20 is provided with a turbine 22 and a condenser 24. Then, water is supplied to the nuclear reactor 12, and the water is heated by the nuclear reactor 12 to generate steam. The steam generated in the nuclear reactor facility 10 is supplied to the turbine facility 20, and the generator connected to the turbine 22 is rotated by rotating the turbine 22 with the force of the steam. Thereby, power generation is performed. The steam that has passed through the turbine 22 is returned to water by a condenser 24 and supplied again to the reactor 12 by a water supply pump (not shown).

  The exhaust gas generated in the nuclear reactor facility 10 is sent to the exhaust pipe 30 through the exhaust gas pipe 14 after the radioactive material is removed by various filters (not shown). Similarly, the exhaust gas generated in the turbine facility 20 is sent to the exhaust pipe 30 through the exhaust gas pipe 26 after the radioactive material is removed by various filters (not shown). Then, the exhaust gas sent to the exhaust cylinder 30 is released into the atmosphere through the opening at the tip of the exhaust cylinder 30.

  A first IKP 50 having a plurality of nozzles 50 a is inserted in the upper part of the exhaust cylinder 30 perpendicularly to the axial direction of the exhaust cylinder 30. Further, a second IKP 60 having a plurality of nozzles 60 a is inserted perpendicularly to the axial direction of the exhaust cylinder 30 at a predetermined interval below the first IKP 50. A first sampling tube 52 is connected to the first IKP 50, and a second sampling tube 62 is connected to the second IKP 60. The first sampling pipe 52 and the second sampling pipe 62 guide the exhaust gas sucked by the first IKP 50 and the second IKP 60 to the first sampling device 54 and the second sampling device 64, and are fixed to the outer wall surface of the exhaust pipe 30. ing.

  FIG. 2 is a plan view of the exhaust tube 30, and the first IKP 50 and the second IKP 60 form a cross shape when the opening at the tip of the exhaust tube 30 is viewed in plan. Here, the nozzle 50a of the first IKP 50 and the nozzle 60a of the second IKP 60 do not overlap with each other when the opening at the tip of the exhaust pipe 30 is viewed in plan, that is, avoid the central portion of the first IKP 50 and the central portion of the second IKP 60. It is desirable to place it at a different position.

  FIG. 3 is a block diagram showing a configuration of the radiation measurement apparatus 100 according to an embodiment of the present invention, and the radiation measurement apparatus 100 is configured by a first radiation measurement unit 100a and a second radiation measurement unit 100b.

  The first radiation measurement unit 100a includes a first IKP 50, a first sampling pipe 52 connected to the first IKP 50, a first sampling device 54, a first radiation detector 56, a first connection pipe 55, a first suction pump 58, a first 1 exhaust pipe 59, first data processing device 80, first storage device 82, and first display device 84. The second radiation measurement unit 100b includes a second IKP 60, a second sampling pipe 62 connected to the second IKP 60, a second sampling device 64, a second connection pipe 65, a second suction pump 68, a second exhaust pipe 69, A second data processing device 90, a second storage device 92, and a second display device 94 are included.

  A first sampling device 54 is connected to the first IKP 50 via a first sampling tube 52. A first suction pump 58 is connected to the first sampling device 54 via a first connection pipe 55. The first suction pump 58 is connected to a first exhaust pipe 59 that guides exhaust gas to the exhaust cylinder 30.

  Then, by driving the first suction pump 58, the exhaust gas sucked by the first IKP 50 in the exhaust pipe 30 is guided to the outside of the exhaust pipe 30 by the first sampling pipe 52. The exhaust gas is returned to the exhaust pipe 30 through the first sampling pipe 52, the first sampling device 54, the first connection pipe 55, and the first exhaust pipe 59.

  The first IKP 50 has a structure in which a plurality of nozzles (for example, four nozzles) 50a and a connecting pipe connected to each nozzle 50a are attached to a long attachment plate. In addition, the exhaust tube 30 is provided with an insertion port (not shown) for inserting the first IKP 50 and a rail (not shown) for supporting the first IKP 50 so as to be slidable. The first IKP 50 is used as the insertion port. By inserting and engaging the first IKP 50 with the rail and pushing it in, the first IKP 50 is installed in the exhaust stack 30. Further, in the first IKP 50, the outlets of the plurality of connecting pipes connected to the individual nozzles 50a are bundled together, and the outlets are arranged to face the first sampling pipe 52. For this reason, exhaust gases introduced from a plurality of nozzles are mixed inside the first sampling pipe 52 and sent to the first sampling device 54.

  The first sampling device 54 collects a part of the exhaust gas introduced from the first sampling pipe 52. The first radiation detector 56 detects radiation generated from the exhaust gas collected by the first sampling device 54. The exhaust gas collected by the first sampling device 54 is returned to the exhaust stack 30 after the radiation detection by the first radiation detector 56 is completed. The first sampling device 54 collects new exhaust gas, and the first radiation detector 56 detects the radiation of the newly collected exhaust gas. Such an operation is repeated.

  The detection data of the first radiation detector 56 is transmitted to the first data processing device 80, the radiation for each nuclide is analyzed by the first data processing device 80, and the analysis result is stored in a first storage device (for example, a hard disk). Device and RAM) 82 and displayed on the first display device 84.

  The first radiation measurement unit 100a and the second radiation measurement unit 100b have the same configuration. That is, the first IKP 50 and the second IKP 60, the first sampling tube 52 and the second sampling tube 62, the first sampling device 54 and the second sampling device 64, the first connection tube 55 and the second connection tube 65, and the first radiation detector 56. The second radiation detector 66, the first suction pump 58 and the second suction pump 68, the first exhaust pipe 59 and the second exhaust pipe 69, the first data processing device 80 and the second data processing device 90, the first storage device. 82 and the second storage device 92, and the first display device 84 and the second display device 94 are the same. Therefore, detailed description of the second radiation measurement unit 100b is omitted.

  Here, the first sampling tube 52 and the second sampling tube 62 are connected to the first sampling device 54 or the second sampling device 64 through different routes. In other words, the first sampling pipe 52 and the second sampling pipe 62 are piped so as not to be adjacent to each other. According to the present embodiment, as shown in FIG. 1, the first sampling pipe 52 is piped downward from the end of the first IKP 50 along the outer wall of the exhaust tube 30, and the second sampling pipe 62 is also provided. Similarly, piping is provided from the end of the second IKP 60 toward the lower side along the outer wall of the exhaust stack 30. That is, the first sampling pipe 52 and the second sampling pipe 62 are piped at a position 90 degrees away from the central axis of the exhaust tube 30.

  When the normal operation is performed in the nuclear reactor facility 10 and the turbine facility 20 shown in FIG. 1, the radiation in the exhaust stack 30 is measured using both the first radiation measurement unit 100 a and the second radiation measurement unit 100 b. I do. And when checking the 1st IKP50, the 1st radiation measurement part 100a is stopped, and the 1st IKP50 is pulled out and checked. While the first radiation measuring unit 100a is stopped, the radiation is measured by the second radiation measuring unit 100b. Conversely, when inspecting the second IKP 60, the second radiation measuring unit 100b is stopped and the second IKP 60 is pulled out for inspection. While the second radiation measuring unit 100b is stopped, the radiation is measured by the first radiation measuring unit 100a.

  As described above, according to the present embodiment, when the first IKP 50 is inspected, the first radiation measurement unit 100a is stopped and the first IKP 50 is pulled out for inspection. While the first radiation measuring unit 100a is stopped, the radiation is measured by the second radiation measuring unit 100b. As a result, the missing measurement period does not occur during the IKP inspection, and the continuity of radiation measurement in the exhaust stack 30 is maintained.

  In addition, according to the present embodiment, the first sampling pipe 52 and the second sampling pipe 62 are corroded at the same time because the first sampling pipe 52 and the second sampling pipe 62 are separated from each other by another route. It is possible to avoid such a situation. As a result, when it becomes necessary to replace either the first sampling tube 52 or the second sampling tube 62, the radiation measuring unit having the sampling tube to be replaced is stopped. The radiation is measured by the unit. Thereby, when exchanging the sampling tube, no missing measurement period occurs, and the continuity of radiation measurement in the exhaust stack 30 is maintained.

  Further, according to the present embodiment, the first IKP 50 and the second IKP 60 are arranged in a cross shape when the inside of the exhaust pipe 30 is viewed in plan view, so that exhaust gas is sampled in a wide range in the exhaust pipe 30. Is possible. This makes it possible to perform highly accurate radiation measurement.

  In addition, according to the present embodiment, the first radiation measurement unit 100a and the second radiation measurement unit 100b are completely duplicated by the first radiation measurement unit 100a and the second radiation measurement unit 100b. Can be inspected and measured without interfering with each other. For example, the first IKP 50, the first sampling pipe 52, the first sampling device 54, the first radiation detector 56, the first connection pipe 55, the first suction pump 58, and the first exhaust gas constituting the first radiation measurement unit 100a. When a defect occurs in any one of the tube 59, the first data processing device 80, the first storage device 82, and the first display device 84, radiation measurement by the first radiation measurement unit 100a cannot be performed. 2 Radiation measurement by the radiation measurement unit 100b is continuously performed. As a result, a missing measurement period does not occur, and the continuity of radiation measurement in the exhaust stack 30 is maintained.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. For example, according to the above-described embodiment, the first radiation measurement unit 100a includes the first data processing device 80, the first storage device 82, and the first display device 84, and the second radiation measurement unit 100b includes the second data. Although the processing device 90, the second storage device 92, and the second display device 94 are provided, as shown in FIG. 4, the detection data from the first radiation detector 56 and the second radiation detector 66 are shared data. The analysis may be performed by the processing device 110, stored in the storage device 120, and displayed by the display device 130. In this way, the cost of the radiation measuring apparatus 100 can be reduced by sharing the electrical configuration.

  3 and FIG. 4, the first suction pump 58 is provided in the first radiation measurement unit 100a and the second suction pump 68 is provided in the second radiation measurement unit 100b. The first suction pump 68, the first exhaust pipe 59, and the second exhaust pipe 69 may be shared by the first radiation measurement unit 100a and the second radiation measurement unit 100b.

  In addition, the second IKP 60 disposed in the lower stage in the exhaust pipe 30 flows the second IKP 60 so that the flow of the exhaust gas in the exhaust pipe 30 is not disturbed and the measurement result of the first radiation measurement unit is not affected. You may comprise linearly.

  Further, although the radiation measurement result by the first radiation measurement unit 100a and the radiation measurement result by the second radiation measurement unit 100b are expected to be close to each other, the usage period of the first IKP50 and the second IKP60, and others Due to this factor, there may be a difference between the radiation measurement result by the first radiation measurement unit 100a and the radiation measurement result by the second radiation measurement unit 100b. Therefore, when the difference between the measurement result of the radiation by the first radiation measurement unit 100a and the measurement result of the radiation by the second radiation measurement unit 100b becomes a certain value or more, the inspection may be promoted. This makes it possible to perform highly accurate radiation measurement.

DESCRIPTION OF SYMBOLS 10 Reactor facility 12 Reactor 14 Exhaust pipe 20 Turbine facility 22 Turbine 24 Condenser 26 Exhaust pipe 30 Exhaust tube 50 1st isokinetic probe (1st IKP)
50a, 60a Nozzle 60 Second isokinetic probe (second IKP)
52 1st sampling pipe 54 1st sampling apparatus 55 1st connection pipe 56 1st radiation detector 58 1st suction pump 59 1st exhaust pipe 62 2nd sampling pipe 64 2nd sampling apparatus 65 2nd connection pipe 66 2nd radiation Detector 68 Second suction pump 69 Second exhaust pipe 80 First data processing device 82 First storage device 84 First display device 90 Second data processing device 92 Second storage device 94 Second display device 100 Radiation measurement device 100a First 1 radiation measurement unit 100b second radiation measurement unit 110 data processing device 120 storage device 130 display device

Claims (3)

In the radiation measurement device that measures the radiation in the exhaust stack,
A first probe having a plurality of nozzles disposed in the exhaust pipe and sucking a part of the exhaust gas in the exhaust pipe;
A first sampling pipe for guiding the exhaust gas sucked from the first probe to the outside of the exhaust pipe;
A first sampling means connected to the first sampling pipe for collecting a part of the exhaust gas introduced from the first sampling pipe; and a first radiation detection for detecting radiation of the exhaust gas collected by the first sampling means. A first radiation measurement unit comprising means;
A second probe disposed in the exhaust pipe and having a plurality of nozzles for sucking the exhaust gas in the exhaust pipe;
A second sampling pipe for guiding the exhaust gas sucked from the second probe to the outside of the exhaust pipe;
A second sampling means connected to the second sampling pipe and collecting a part of the exhaust gas introduced from the second sampling pipe; and a second radiation detection for detecting radiation of the exhaust gas collected by the second sampling means. A second radiation measurement unit comprising means,
Said first radiation measurement portion and the second radiation measurement section have rows detection of independently radiation,
The radiation measuring apparatus according to claim 1, wherein the first sampling tube and the second sampling tube are separated from each other and pass through different routes along the outer wall of the exhaust pipe . The radiation measuring apparatus according to claim 1, wherein the first probe and the second probe are arranged in a cross shape when the inside of the exhaust pipe is viewed in plan . The first radiation measurement unit has first data processing means for analyzing the detection result of the first radiation detection means, and first display means for displaying the analysis result of the first data processing means,
The second radiation measurement unit includes a second data processing unit that analyzes a detection result of the second radiation detection unit, and a second display unit that displays an analysis result of the second data processing unit. The radiation measuring apparatus according to claim 1 or 2.

Images