JPH1114783A - Instrumentation equipment for nuclear reactor containment vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain size reduction in the monitoring facility of a nuclear reactor containment vessel, simplify a nuclear reactor building layout and a nuclear reactor containment vessel frame structure, and improve reliability. SOLUTION: A plurality of dew point and leakage detection points 7 are formed in a nuclear reactor containment vessel 1, and a solenoid valve 6 is connected to the respective detection points 7. Suction piping 10 is connected to the solenoid valve 6, and the suction piping 10 is guided up to the inside of a rack 24 for monitoring a single dew point and leakage. Measuring instruments, such as a dust sampler 21, a gas sampler 26, and a dew point detector 27 are provided in the dew point and leakage monitoring rack 24. It is thus possible to measure the dew point and leakage detection in the nuclear reactor containment vessel concurrently, and conduct the measurement and analysis of a dew point, gas, dust and radioactivity from an identical detection point. By sharing dew point detection instruments with leakage detection instruments to reduce the number of them, it is possible to contribute for a decrease in exposure of a worker to radioactive ray and radioactive waste amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrumentation system in a reactor vessel for monitoring a dew point of air and a leak of air or moisture in a reactor vessel in a boiling water nuclear power plant.

[0002]

2. Description of the Related Art In a boiling water nuclear power plant, a dew point instrumentation facility and a leak detection system facility are separately installed to monitor the atmosphere of a dry well or a wet well of a containment vessel. FIG. 2 shows a conventional dew point instrumentation facility for a containment vessel, and FIG. 3 shows a leak detection system facility for a containment vessel as a piping instrumentation diagram.

That is, in FIG. 2, reference numeral 1 denotes a reactor containment vessel, 2 denotes a reactor pressure vessel installed in the reactor containment vessel 1, 3 denotes a containment penetrating portion, and 4 denotes a reactor containment vessel 1.
An external manual valve, 5 is an isolation valve, 6 is an electromagnetic valve provided in the reactor containment vessel 1, and 7 is a detection point nozzle for detecting a dew point in the reactor containment vessel 1. .

A suction pipe 10 connected to the outlet side of the solenoid valve 6 and a return pipe 9 having one end opening into the containment vessel 1 penetrate the containment penetrating portion 3, and the return pipe 9 and the suction pipe are connected to each other.
The other end of 10 is guided into the instrumentation rack 33. Suction piping 10
An electric heater 11 for piping is provided on the outside.

In the instrumentation rack 33, an electromagnetic valve opening / closing device 14 for opening and closing the electromagnetic valve 6 in the reactor containment vessel 1, a pressure gauge 35 for measuring the pressure in the return pipe 9, and a suction pump connected to the return pipe 9 23, temperature indication switch 13, suction pump operation switch
29, a flow meter 19, a filter 17, a dew point detector 27, a dew point converter 30, a temperature detector 28, and the like are installed. Return piping 9
And the end of the suction pipe 10 is connected to the dew point detector 27.
In FIG. 2, reference numeral 8 denotes an isolation signal, 34 denotes a monitor panel output, 38 denotes a bypass pipe, and 39 to 41 denote on-off valves.

As described above, in the conventional dew point instrumentation system for the PCV, the electromagnetic valves 6 are provided at the respective detection points 7 in the PCV 1 and the electromagnetic valves 6 are switched so that the dew point for each of the detection points 7 is obtained. Is monitoring. That is, the piping from each detection point 7 is drawn out of the reactor containment vessel 1 and is drawn by the suction pump 23 in the instrumentation rack 33.
After the dew point is measured by the dew point detector 27, the measured air is returned through the return pipe 9 into the containment vessel 1.

Next, the structure of the leak detection system equipment for the containment vessel will be described with reference to FIG. In FIG. 3, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the description of the overlapping parts will be omitted.

3 differs from FIG. 2 mainly in that a dust sampler 21 and a gas sampler 26 are provided in a leak monitoring rack 36, and the suction pipe 10 is branched in two directions. The configuration is such that the dust sampler 21 and the gas sampler 26 are connected in parallel so that they communicate with each other, and the output signals of the dust sampler 21 and the gas sampler 26 are connected to the monitor 12 so that they can be monitored.

The branch suction pipe 10a on the dust sampler 21 side
Is provided with a temperature detector 28 and a temperature indicating switch 13.
5, dust sampler 21, pipe cooling unit 20 with cooling fan 16, joint 22, flow meter 19, filter 17, suction pump 2
3, the joint 22 and the device outlet solenoid valve 43 are connected in series.

On the other hand, a branch suction pipe on the gas sampler 26 side
10b has a joint 22, an on-off valve 42, a heater 25, a filter 17,
A pipe cooling unit 20 having a cooling fan 16, a gas sampler 26,
Flow meter 19, suction pump 23, joint 22, and solenoid valve at device outlet
43 are connected in series.

A branch from the outlet side of the dust sampler 21 is connected to one end of a communication pipe 44, and the other end of the communication pipe 44 is connected to a gas sampler.
It is connected to a joint 22 connected to the outlet of the filter 17 on the 26 side. The dust sampler 21 has a scintillation detector 31 attached thereto, and the gas sampler 26 has a plastic scintillation detector 32 attached thereto. Partition wall between the dust sampler 21 and gas sampler 26
It is divided by 45.

As described above, the reactor containment leak detection system shown in FIG.
From the reactor containment vessel 1 through the suction pipe 10, and the air inside the reactor containment vessel 1 is drawn out by the suction pump 23 in the dedicated instrumentation rack 36, and the gas and dust in the reactor containment vessel 1 are drawn out. Then, after the analysis of the radioactivity, it is returned to the containment vessel 1 via the return pipe 9 again.

The leak detection method employs a method in which air is collectively sucked from each detection point 7 and analyzed. In addition, similar to the reactor dew point dew point instrumentation equipment shown in FIG.
Since the return pipe 9 and the suction pipe 10 penetrate the containment vessel 1, two isolation valves 5 are provided on the suction side and the return side of the containment penetration portion 3, respectively.
An electric heater 11 is provided.

[0014]

As shown in FIGS. 2 and 3, the dew point instrumentation equipment in the containment vessel and the leak detection system equipment in the containment vessel draw out air from the containment vessel 1, A similar system is returned to the containment vessel 1 after analysis, but each is installed independently. For this reason, the piping drawn from the containment vessel is also separate, and the isolation valve, suction pump, and electric heater that penetrate the containment vessel are also separately provided.

[0015] From these facts, there is a problem that the amount of investment in equipment is large, the installation area of the equipment is large, and the amount of maintenance is also large. Further, in the leak detection, particularly in a nuclear power plant of an advanced boiling water reactor (ABWR), the reactor containment vessel is divided into an upper part and a lower part.

The present invention has been made in order to solve the above-mentioned problems, and has been made to reduce the size of monitoring equipment for a reactor containment vessel.
A PCV instrumentation system that reduces the volume of the PCV penetration, simplifies the reactor building layout and the structure of the PCV, and improves the reliability of the PCV. To provide.

[0017]

According to the first aspect of the present invention, a plurality of detection points installed in a reactor containment vessel and a suction pipe in the containment vessel connected to the plurality of detection points via an electromagnetic valve are provided. A suction pipe outside the containment vessel that is connected to the suction pipe inside the containment vessel, penetrates through the containment vessel penetrating section, and is led out of the containment vessel, and is connected to the suction pipe outside the containment vessel and outside the containment vessel. A suction pipe in the instrumentation rack housed in an instrumentation rack installed in the instrument rack, a dust sampler, a heater, and a dew point detector which are branched into the suction pipe in the instrumentation rack and connected via an electromagnetic valve at the device entrance;
A binding pipe for binding the outlet side of the dust sampler, the heater, and the dew point detector, a suction pump connected to the binding pipe, and a discharge side of the suction pump, which is outside the instrumentation rack via a device outlet solenoid valve. And a return pipe whose leading end is opened inside the reactor containment vessel.

According to the first aspect of the present invention, the dew point instrumentation equipment and the leak detection system equipment which have conventionally been separately installed are housed in a single instrumentation rack to form an integrated system and can be shared. It is possible to reduce the number of common parts such as equipment, instruments, and piping, and to reduce the size of equipment. In addition, dew point and leak detection in the containment vessel can be detected at the same time, which contributes to radiation exposure of workers and reduction of radioactive waste.

According to a second aspect of the present invention, in the instrumentation rack,
An electromagnetic valve opening / closing device is provided, and a plurality of electromagnetic valves provided in the containment vessel are electrically connected to the electromagnetic valve opening / closing device.

According to the invention of claim 2, in conjunction with the effect of the invention of claim 1, a plurality of solenoid valves provided at the detection point can be automatically or manually opened and closed from within the instrumentation rack. Also,
By providing an electromagnetic valve for each detection point, switching at the detection point can be easily performed, and leakage and dew point at each detection point can be monitored.

According to a third aspect of the present invention, there is provided the device inlet solenoid valve,
The device outlet solenoid valve, a suction pump operation switch provided in the suction pump, a detector of the dust sampler, a detector of the gas sampler, a dew point converter of the dew point meter, and a temperature provided in a suction pipe in the instrumentation rack. A monitor for electrically connecting the indicating switch and the temperature detector is provided.

According to the third aspect of the present invention, together with the effect of the first aspect of the present invention, the dew point, gas,
Since dust and radioactivity can be measured and analyzed, comprehensive monitoring inside the reactor containment vessel can be performed. Also,
The analysis of the air guided into the instrumentation rack by the suction pump can simultaneously measure the dew point and the leak.

According to a fourth aspect of the present invention, an operation switch is provided in the instrumentation rack, and a plurality of operation switches are provided in the device inlet solenoid valve, the device outlet solenoid valve, the suction pipe outside the storage container, and the return pipe. Are electrically connected to each other.

According to the fourth aspect of the present invention, since it can be electrically operated by remote control, it contributes to the reduction of radiation exposure of workers. Further, the suction pipe and the return pipe for detection from the detection point in the containment vessel can be shared as one line, which contributes to simplification of operation.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an instrumentation system for a containment vessel according to the present invention will be described with reference to FIG. 1, the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals, and the description of the duplicated parts will be omitted.

In FIG. 1, a detection point 7 commonly used for dew point detection and leak detection is provided in the reactor containment vessel 1.
Are scattered around the reactor pressure vessel 2.
An electromagnetic valve 6 is connected to each detection point 7.
Each solenoid valve 7 is electrically connected to a solenoid valve opening / closing device (SSA) 14.

From inside the containment vessel 1 to the containment penetration 3
The end of the suction pipe 10 outside the storage container, which is led out through the above, is housed in a single dew point and leak monitoring instrumentation rack 24. In the instrumentation rack 24, the suction pipe 10 in the instrumentation rack is branched and connected to the dust sampler 21, the heater 25, and the dew point detector 27.

In a single instrumentation rack 24, a dust sampler is provided.
There are provided a system 21, a system from a heater 25 to a plastic scintillation detector 32, and a system from a dew point detector 27. The outlet sides of these three systems are bound by a collective pipe 46, and the downstream side of the collective pipe 46 is connected to the suction pump 23 and the apparatus outlet solenoid valve 43.
Is connected to a return pipe 9.

The scintillation detector 31 of the dust sampler 21, the plastic scintillation detector 32 of the gas sampler 26, and the dew point converter 30 are electrically connected to the monitor 12. The apparatus inlet electromagnetic valve 15, the suction pump operation switch 29, the suction pump 23 and the operation switch 18 are electrically connected to the temperature instruction switch (TIS) 13.

In the present embodiment, the opening / closing solenoid valve 6 is provided at each detection point nozzle 7 for measurement in the reactor containment vessel 1, and the suction pipe from the solenoid valve 6 to the inside of the containment vessel is provided.
10a is connected and connected to a main pipe in front of the containment container penetrating portion 3.

The suction pipe 10 includes a suction pipe 10c in the containment vessel installed in the reactor containment vessel 1 and the penetration section 3 of the containment vessel.
A suction pipe 10d drawn out of the containment vessel 1 through the containment vessel 1 and a suction pipe 10e in the instrumentation rack led out to the dew point and leak monitoring rack 24 of the containment vessel via two isolation valves 5. It consists of

An electric heater 11 for piping is installed in the suction pipe 10e in the instrumentation rack extending from the containment vessel penetrating portion 3 to the dew point after the isolation valve 5 and to the leak monitoring rack 24, and from outside the containment vessel 1. In order to prevent condensation of the drawn air, monitoring and turning on / off are performed by the thermometer 28 and the temperature indicating switch 13.

In the rack 24 for monitoring the dew point and the leak, a suction pump 23 is installed to extract air from each detection point nozzle 7 in the containment vessel 1, and the dust sampler 21 and the gas sampler are 26 and dew point meter 27
The air of each detection line can be sucked.

Gas, dust and radioactivity are analyzed by the scintillation detector 31 in the dust sampler 21 and the plastic scintillation detector 32 in the gas sampler 26, and the dew point temperature is analyzed by the dew point detector 27 and the dew point converter 30. Then, the pipe is again connected to the two isolation valves 5 outside the containment vessel by one return pipe 9 via the suction pump 23, and returned to the reactor containment vessel 1 via the containment penetration portion 3.

The electromagnetic valve 6 provided at the detection point 7 is provided with an electromagnetic valve opening / closing device 14 in the dew point / leakage monitoring rack 24 so that it can be automatically and manually opened and closed from the dew point / leakage monitoring rack 24 side.

According to the present embodiment, the piping containment penetrating portion from the detection point in the containment vessel common to the dew point instrumentation equipment in the containment vessel and the reactor containment leak detection system equipment to the instrumentation rack is provided. An isolation valve, an electric heater, and a suction pump can be integrated into one to provide a reactor containment instrumentation facility capable of measuring a dew point and detecting a leak at each detection point in one instrumentation rack.

[0037]

According to the present invention, the dew point instrumentation equipment and the leak detection system equipment are conventionally provided separately, but these are housed in a single instrumentation rack and integrated. ,
The monitoring equipment for the reactor containment vessel can be reduced in size. In addition, the layout of the reactor building and the structure of the building frame can be simplified, and the reliability of the reactor containment vessel can be improved, in addition to the fact that the volume of the containment vessel penetration part can be reduced.

Further, the measurement of the dew point in the reactor containment vessel and the detection of leakage can be performed simultaneously, and the dew point, gas, dust and radioactivity can be measured and analyzed from the same detection point. Monitoring is possible.

In these maintenances, dew point detection and leak detectors were shared and reduced,
It also contributes to reducing radiation exposure of workers and radioactive waste.

[Brief description of the drawings]

FIG. 1 is a piping instrumentation diagram showing an embodiment of an instrumentation facility for a containment vessel according to the present invention.

FIG. 2 is a piping instrumentation diagram showing conventional dew point instrumentation equipment for a containment vessel.

FIG. 3 is a piping instrumentation diagram showing conventional leak detection system equipment for a containment vessel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Containment vessel, 2 ... Reactor pressure vessel, 3 ... Containment vessel penetration part, 4 ... Manual valve, 5 ... Isolation valve, 6 ... Solenoid valve, 7 ...
Detection point nozzle, 8 ... isolation signal, 9 ... return pipe, 10
... Suction pipe, 10a, 10b ... Branch suction pipe, 10c ... Suction pipe inside containment vessel, 10d ... Suction pipe outside containment vessel, 10
e: suction pipe in instrumentation rack, 11: electric heater for pipe,
12 monitor, 13 temperature switch, 14 solenoid valve opening / closing device, 15 inlet solenoid valve of device, 16 cooling fan, 17 filter, 18 operation switch, 19 flow meter, 20 pipe cooling unit,
21 ... dust sampler, 22 ... joint, 23 ... suction pump, 24
... Rack for monitoring dew point and leak, 25 ... Heater, 26 ... Gas sampler, 27 ... Dew point detector, 28 ... Temperature detector, 29 ... Suction pump operation switch, 30 ... Dew point meter converter, 31 ... Scintillation detector, 32 ... Plastic scintillation detector, 33 ... Container enclosure dew point instrumentation rack, 34 ... Monitor panel output, 35 ... Pressure indicator, 36 ... Leakage monitoring rack, 37 ... Manual switch for solenoid valve opening and closing, 38 ... Bypass pipe, 39 , 40,41,42
... On-off valve, 43 ... Device outlet solenoid valve, 44 ... Connecting pipe, 45 ... Partition wall, 46 ... Collective piping.

Claims (4)

[Claims] 1. A plurality of detection points installed in a reactor containment vessel, a suction pipe in the containment vessel connected to the plurality of detection points via an electromagnetic valve, and a storage pipe connected to the suction pipe in the containment vessel. A suction pipe outside the containment vessel that penetrates through the vessel penetration part and is led out of the containment vessel, and is connected to the suction pipe outside the containment vessel and is housed in an instrumentation rack installed outside the containment vessel. Of a dust sampler, a heater and a dew point detector which are branched into the suction pipe in the instrumentation rack, connected to the suction pipe in the instrumentation rack via a solenoid valve at the device inlet, and a detector of the dust sampler, the heater and the dew point detector. A binding pipe for binding the outlet side, a suction pump connected to the binding pipe, and a leading end connected to the discharge side of the suction pump, which is led out of the instrumentation rack via a device outlet solenoid valve and connected to the end. And a return pipe opened in the containment vessel. 2. An electromagnetic valve opening / closing device is provided in the instrumentation rack, and a plurality of electromagnetic valves provided in the reactor containment vessel are electrically connected to the electromagnetic valve opening / closing device. The instrumentation equipment for a containment vessel according to claim 1. A suction pump operation switch provided on the suction pump, wherein the device inlet solenoid valve, the device outlet solenoid valve, and the suction pump;
A detector for the dust sampler, a detector for the gas sampler, a dew point converter for the dew point meter, a temperature indicator switch provided on the suction pipe in the instrumentation rack, and a monitor for electrically connecting the temperature detector. The instrumentation equipment for a containment vessel according to claim 1, wherein: 4. An operation switch is provided in the instrumentation rack, and the operation switch electrically connects a plurality of isolation valves provided in the apparatus inlet solenoid valve, the apparatus outlet solenoid valve, the suction pipe outside the containment vessel, and the return pipe. The instrumentation equipment for a containment vessel according to claim 1, wherein the instrumentation equipment is connected to the reactor.