JP2014044118A - Filter vent device of nuclear reactor containment vessel, and the nuclear reactor containment vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a vacuum state generated in an inlet pipe 10 of a filter vessel 12 after a filter vent operation of a nuclear reactor containment vessel.SOLUTION: When pressure rises inside a nuclear reactor containment vessel 1, separation valves 6 and 7 open to send high-temperature gas containing radioactive materials in the nuclear reactor containment vessel 1 to a filter vessel 12 housing pool water 11 for removing radioactive materials and a radioactive material removal filter 17. Then, by scrubbing in the pool water 11 and collection with the filter 17, radioactive materials in the gas are removed as much as possible to allow the radioactive material-reduced gas to discharge from an exhaust tube 15 into the atmosphere via an outlet pipe 14. The separation valves 6 and 7 are closed after the pressure is sufficiently reduced. After that, when the temperature inside the inlet pipe 10 gradually lowers to condense water vapor inside the pipe and to cause the inside of the pipe to be in a depressurized state, a check valve 36 operates to let outer air flow into the inlet pipe 10 via a vacuum eliminating pipe 37 to eliminate the depressurized state.

Description

  The present invention relates to a filter vent device for a reactor containment vessel and a reactor containment vessel.

  At a nuclear power plant, a design standard accident is assumed and equipment / equipment is designed so as to respond to it. However, in the unlikely event that an accident that exceeds the design standard accident occurs, it is necessary to prevent a major disaster. For this reason, in the event of an accident that exceeds the design standard accident of a nuclear power plant, if there is a possibility of damage to the reactor containment unless the inside of the reactor containment is depressurized, When the gas contains a radioactive substance, it is necessary to remove the hot gas into the atmosphere after removing it as much as possible.

  As this prior art, an exhaust pipe opened to the atmosphere and a condensate storage container are connected by a vent pipe inserted with an isolation valve or the like, and an isolation valve or the like is provided between the condensate storage container and the reactor containment vessel. Some are connected by an interposed vent pipe (see Patent Document 1).

JP-A-9-61577

In the vent apparatus as described in Patent Document 1, after the isolation valve is closed, the temperature in the inlet pipe of the filter container gradually decreases and the water vapor inside condenses, so the inside of the inlet pipe is in a vacuum state.
Various problems occur when the inlet piping is in a vacuum state.

For example, when the inside of the inlet pipe of the filter container is in a vacuum state, pool water of the filter container is sucked into the inlet pipe. At this time, if there is a low place upstream of the inlet pipe of the filter container, the sucked-up pool water may remain at a low place in the inlet pipe.
For this reason, since the amount of pool water in the filter container is reduced and the amount of water for scrubbing radioactive material is reduced, there is a problem that the effect of removing the radioactive material expected for scrubbing is reduced. .

  The present invention provides a reactor containment vessel filter vent apparatus and an atom equipped with such a filter vent device, which can quickly eliminate the vacuum state in the inlet pipe of the filter vessel after the reactor containment vessel filter vent operation. Providing a containment vessel.

  In order to achieve the above object, the present invention provides a filter containment device for a reactor containment vessel having a filter for removing pool water and radioactive substances therein, and a dry well in the reactor containment vessel. And a vent pipe connected to the wet well, an isolation valve provided in the vent pipe, an inlet pipe having one end connected to the vent pipe and the other end introduced into the pool water of the filter container, and the filter container An outlet pipe connected to an internal filter, and a vacuum generated in the inlet pipe by closing the isolation valve being opened after the filter vent operation of the reactor containment vessel and then introducing outside air into the inlet pipe And a vacuum release means for eliminating the above-mentioned problem.

  According to the present invention, the vacuum state in the inlet pipe of the filter vessel after the reactor containment vessel filter vent operation can be quickly eliminated. As a result, it is possible to suppress the decrease in the amount of scrubbing water in the filter container and maintain the effect of removing radioactive substances.

1 is a longitudinal sectional view showing a schematic configuration of a first embodiment of a reactor containment vessel and a filter vent apparatus according to the present invention. It is a longitudinal cross-sectional view which shows schematic structure of 2nd Embodiment of the nuclear reactor containment vessel and filter vent apparatus of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the modification of 2nd Embodiment of the nuclear reactor containment vessel and filter vent apparatus of this invention. It is a longitudinal cross-sectional view which shows schematic structure of 3rd Embodiment of the nuclear reactor containment vessel and filter vent apparatus of this invention.

  Hereinafter, embodiments of a filter vent device and a reactor containment vessel according to the present invention will be described with reference to the drawings.

<First Embodiment>
1st Embodiment of the filter vent apparatus and reactor containment vessel of this invention is described using FIG.
FIG. 1 is a longitudinal sectional view showing a schematic configuration of a first embodiment of a reactor containment vessel and a filter vent apparatus according to the present invention.

  The filter vent device according to the first embodiment of the present invention reduces the pressure in the reactor containment vessel 1 in which the dry well 3 and the wet well 4 are present in a severe accident such as damage to the reactor pressure vessel 2. It removes radioactive substances as much as possible.

  In FIG. 1, a reactor containment vessel 1 is stored in the reactor building. In the reactor containment vessel 1, a dry well 3 is provided at an upper part thereof, and a suppression pool 5 for holding cooling water and an air layer wet well 4 thereabove are provided at a lower part thereof. A reactor pressure vessel 2 is accommodated in the reactor containment vessel 1.

The vent pipe 8 is connected to the dry well 3 of the reactor containment vessel 1. An isolation valve 6 is disposed in the vent pipe 8. The vent pipe 9 is connected to the wet well 4 of the reactor containment vessel 1, and the vent valve 9 is provided with an isolation valve 7.
These vent pipes 8 and 9 are connected to the inlet pipe 10 of the filter container 12 in the filter vent device 20. The distal end side of the inlet pipe 10 is introduced into the filter container 12.

  A scrubbing pool water 11 is stored on the lower side in the filter container 12. A radioactive substance removal filter 17 is installed on the upper side of the filter container 12. One end of the outlet pipe 14 of the filter container 12 is connected to the filter 17. The other end of the outlet pipe 14 passes through the shielding wall 13 and is led out of the shielding wall 13. An exhaust pipe 15 is provided at the other end of the outlet pipe 14. In the filter container 12, radioactive substances accumulate in the pool water 11 and in the radioactive substance removal filter 17, thereby providing a very strong radiation source. For this reason, a shielding wall 13 is provided around the filter container 12 in order to sufficiently reduce the influence of radiation on the surrounding environment and smoothly proceed with the recovery operation of the nuclear power plant after the accident.

  Further, a vacuum release pipe 37 is connected between the inlet pipe 10 and the outlet pipe 14. The vacuum release pipe 37 is provided with two check valves 36 that allow the flow of air only from the outlet pipe 14 side to the inlet pipe 10 side.

  In this example, the filter vent device 20 includes an isolation valve 6, an isolation valve 7, a vent pipe 8, a vent pipe 9, an inlet pipe 10, a filter container 12, a shielding wall 13, an outlet pipe 14, The exhaust cylinder 15, the check valve 36, and the vacuum release pipe 37 are configured.

  Next, in the unlikely event that a nuclear reactor coolant loss accident occurs and multiple failures occur in the dynamic system of the safety system, the operation (operation) of the first embodiment of the filter vent device of the present invention will be described. explain.

  When the reactor pressure vessel 2 is damaged due to melting of the core or the like, a high-temperature gas containing radioactive material blows into the reactor containment vessel 1, and the pressure inside the reactor containment vessel 1 is increased by filling the high-temperature gas. To rise. Further, the melting of the core proceeds and the core melt falls from the reactor pressure vessel 2 to the reactor containment vessel 1. Thereafter, the effluent water from the core and the coolant injected for cooling the core melt become high-temperature gas due to the decay heat of the core melt. This high-temperature gas further raises the pressure in the reactor containment vessel 1.

  As described above, when the pressure inside the containment vessel 1 increases and there is a risk of damage unless the pressure is reduced, the inside of the containment vessel 1 is decompressed before the containment vessel 1 is damaged. There is a need.

  Therefore, the filter vent device 20 opens the isolation valve 6 or the isolation valve 7, removes radioactive substances as much as possible through the filter container 12, and then releases gas into the atmosphere from the exhaust stack 15. The radioactive material reduction gas in the inside is discharged.

For example, when the suppression pool 5 is at a normal water level, the isolation valve 6 is closed and the isolation valve 7 is opened.
Thereby, the high-temperature gas containing the radioactive substance generated in the nuclear reactor containment vessel 1 passes through the pool water 11 and the radioactive substance removal filter 17 in the filter vessel 12 through the vent pipe 9 and the inlet pipe 10. And the filter vent apparatus 20 removes the radioactive substance in gas as much as possible by scrubbing with the pool water 11, and collection with the filter 17, and discharges | emits the gas which reduced the radioactive substance from the exhaust pipe 15 via the exit piping 14. FIG. .
When the water level of the suppression pool 5 rises to the vicinity of the open end of the vent pipe 9 on the wet well 4 side, the isolation valve 7 is closed and the isolation valve 6 is opened.

  Built-in pool water 11 and a radioactive substance removal filter 17 for removing the radioactive substance through the vent pipe 8 and the inlet pipe 10 from the high-temperature gas containing the radioactive substance generated in the reactor containment vessel 1 by the above-described operation. The filter container 12 is sent. Then, by scrubbing with the pool water 11 in the filter container 12 and collecting with the filter 17, the radioactive material in the gas is removed as much as possible, and is discharged from the exhaust cylinder 15 through the outlet pipe 14 as a gas with reduced radioactive material.

  In the event of a severe accident such as the reactor pressure vessel 2 being damaged by the filter vent operation in this series of reactor containment vessels, the amount of radioactive material released into the atmosphere is suppressed as much as possible, and the inside of the reactor containment vessel 1 Reduce the pressure in each part. After confirming that the containment vessel filter vent operation reduced the pressure inside the containment vessel 1 and avoided the risk of damage to the containment vessel 1, the release of radioactive materials into the atmosphere In order to suppress this, the open isolation valve 6 or isolation valve 7 is closed.

  After the isolation valve 6 or the isolation valve 7 is closed, the temperature in the inlet pipe 10 gradually decreases, water vapor contained in the gas in the inlet pipe 10 is condensed, and the pressure in the pipe is reduced to reduce the pressure (vacuum state). )

  Thus, when the inside of the inlet pipe 10 is in a vacuum state, the check valve 36 is activated, and the outside air (air) is supplied to the inlet pipe 10 via the exhaust tower 15, the outlet pipe 14 and the vacuum release pipe 37. As a result, the vacuum state in the inlet pipe 10 is quickly eliminated.

According to the first embodiment of the filter vent device and the reactor containment vessel of the present invention described above, the outside air is automatically introduced from the check valve 36 when the inside of the inlet pipe 10 is evacuated. The vacuum state in the pipe 10 can be quickly eliminated without the operator's operation.
For this reason, it is possible to prevent various problems as described below from occurring.

For example, when the rising length of the inlet pipe 10 in the filter container 12 from the water surface of the pool water 11 is equal to or less than the water head corresponding to the pressure in the filter container 11 and there is a low position on the upstream side of the inlet pipe 10 There is a possibility that the pool water 11 that has been sucked up remains in a low position. In this case, when the pressure in the reactor containment vessel 1 rises again and the reactor containment vessel filter vent operation becomes necessary, the radioactive substance removal effect expected for scrubbing is reduced as the amount of pool water 11 decreases. There is a problem that decreases.
On the other hand, according to the first embodiment of the filter vent device of the present invention, since the inside of the inlet pipe 10 is prevented from being in a vacuum state, the inlet pipe 10 can be prevented from sucking up the pool water 11, Even if a low position exists in the inlet pipe 10, the pool water 11 does not stay in the low position and the scrubbing effect does not decrease. Therefore, it is possible to sufficiently reduce the amount of radioactive material released to the outside during venting.

In addition, when the inlet pipe 10 is in a vacuum state, the stagnant water in the lower position in the inlet pipe 10 formed by sucking pool water and the high-temperature gas flowing from the upstream side by restarting the reactor containment vessel filter vent operation Water hammer may occur due to collision with drain.
However, according to the first embodiment of the filter vent apparatus of the present invention, the inlet pipe 10 can be prevented from sucking up the pool water 11, so that the water hammer as described above does not occur when the vent is resumed, and the inlet It is possible to prevent extra damage to the pipe 10.

Further, when the inlet pipe 10 is in a vacuum state, the inlet pipe 10 sucks up the pool water 11 and includes the pool water 11, so that when the reactor containment vessel filter vent operation is resumed, Since the pool water 11 is pushed out, the exhaust pressure becomes high, and the pressure reduction effect in the reactor containment vessel may be reduced.
On the other hand, according to the first embodiment of the filter vent device of the present invention, the inlet pipe 10 can be prevented from sucking up the pool water 11, so that the exhaust pressure can be prevented from becoming high at the time of venting. Reduction can be prevented.

In addition, when the inlet pipe 10 is in a vacuum state, when the reactor containment vessel filter vent operation is resumed, when a hot gas flows into the pool water 11 sucked up by the inlet pipe 10 and collides, Condensation vibration may occur and excessive stress may be generated in the inlet pipe 10.
However, according to the first embodiment of the filter vent device of the present invention, it is possible to prevent the inlet pipe 10 from sucking up the pool water 11, so that it is possible to prevent the occurrence of condensation vibrations, and excessive stress is applied to the pipe. Can be prevented.

  In addition, since the inlet pipe 10 does not suck up the pool water 11, there is no possibility that the pool water 11 containing the radioactive substance passes through the inlet pipe 10 and goes out of the shielding wall 13. The increase in radiation dose can be prevented, and the occurrence of troubles in access for maintenance and status confirmation can also be prevented.

  Furthermore, recently, not only during severe accidents such as reactor pressure vessel breakage, but also accidents exceeding design basis accidents in which multiple failures occur in safety dynamic equipment and the suppression pool cannot be cooled for a long time. At times, in order to depressurize the reactor containment vessel, it has been studied to use a reactor containment vessel filter vent device for venting the reactor containment vessel. If it is 1st Embodiment, it can prevent that the above various problems generate | occur | produce.

  In addition, if a vacuum release valve is installed in the inlet pipe in the filter vessel, the pool water vapor generated by the decay heat of the radioactive material flows into the inlet pipe, and the inflowed vapor condenses, resulting in a vacuum state again. Thus, there is a problem that the valve is operated many times, but before passing through the radioactive substance removing filter 17 by connecting the other end of the vacuum release pipe 37 to the outlet pipe 14 as in this embodiment. Therefore, it is possible to prevent the gas that has not been sufficiently removed from the radioactive material from returning to the inlet pipe 10 side, and to prevent an increase in dose near the inlet pipe 10. In addition, when the vacuum of the inlet pipe 10 is released, the steam of the pool water 11 generated by the decay heat of the radioactive material flows in, and the steam that flows in condenses, so that the vacuum state is restored again. Can be prevented and a stable vacuum can be released.

  Further, when a bypass isolation valve is provided in a bypass pipe connecting an inlet pipe and an outlet pipe as in Patent Document 1, the bypass isolation valve provided in the bypass pipe is connected to the core even after venting the reactor containment vessel. When it is necessary to secure the water held in the condensate storage container for water injection, etc., the atmosphere inside the reactor containment vessel is bypassed from the condensate storage container and is discharged into the atmosphere via the bypass pipe and the exhaust pipe. Because it is provided for discharge, the bypass isolation valve cannot be a check valve as in the present invention.

<Second Embodiment>
A second embodiment of the filter vent device and the reactor containment vessel of the present invention will be described with reference to FIG.
FIG. 2 is a longitudinal sectional view showing a schematic configuration of a second embodiment of a reactor containment vessel and a filter vent apparatus according to the present invention.

  In the second embodiment of the filter vent device and the reactor containment vessel of the present invention, the inside of the reactor containment vessel 1 in which the dry well 3 and the wet well 4 are present in a severe accident such as the reactor pressure vessel 2 being damaged. This reduces the pressure of the material and removes radioactive substances as much as possible.

As shown in FIG. 2, the second embodiment of the filter vent device and the reactor containment vessel is added to the filter vent device 20 of the first embodiment, in addition to the check valve 36 and the vacuum release pipe 37. A nitrogen supply pipe 33 provided with a nitrogen supply device 31 and a nitrogen supply valve 32 is connected to the inlet pipe 10 of the filter vent device 20.
Specifically, one end of the nitrogen supply pipe 33 is connected to the isolation pipes 6 and 7, the vent pipes 8 and 9 on the downstream side, or the inlet pipe 10. A nitrogen supply device 31 is connected to the other end of the nitrogen supply pipe 33. The nitrogen supply pipe 33 is provided with a nitrogen supply valve 32.

Furthermore, a rupture disk 16 is provided at the outlet pipe 14 of the filter vent device 20 so as to have a set pressure that operates reliably when the reactor containment vessel filter vent is operated. In addition to the rupture disk 16, a nitrogen discharge pipe 35 is further connected to the outlet pipe 14, and a nitrogen discharge valve 34 is provided in the nitrogen discharge pipe 35.
The nitrogen supply pipe 33 described above, the nitrogen supply device 31 connected to the other end of the nitrogen supply pipe 33, the nitrogen supply valve 32 provided in the nitrogen supply pipe 33, the nitrogen discharge valve 34 and the pipe 35 are provided during the vent operation. In order to avoid the formation of detonation due to the inflow of hydrogen generated in the reactor containment vessel 1, the reactor containment vessel filter vent device 20 is maintained in a nitrogen atmosphere during the standby operation.

  The configuration other than the rupture disk 16, the nitrogen supply pipe 33, the nitrogen supply apparatus 31, the nitrogen supply valve 32, the nitrogen discharge valve 34, and the pipe 35 is substantially the same as the filter vent apparatus and the reactor containment vessel of the first embodiment. Yes, details are omitted.

  The second embodiment of the filter vent device 20 of the present invention includes an isolation valve 6, an isolation valve 7, a vent pipe 8, a vent pipe 9, an inlet pipe 10, a filter container 12, a shielding wall 13, The outlet pipe 14, the exhaust cylinder 15, the nitrogen supply device 31, the nitrogen supply valve 32, the nitrogen supply pipe 33, the nitrogen discharge valve 34, the pipe 35, the check valve 36, and the vacuum release pipe 37 It is constituted by.

  In the following, the operation (operation) of the second embodiment of the filter vent device of the present invention is assumed in the event that a nuclear reactor coolant loss accident occurs and multiple failures occur in the dynamic system of the safety system. explain.

  When the pressure inside the containment vessel 1 rises and there is a risk of damage unless the pressure is reduced, the isolation valve 6 is used to decompress the inside of the containment vessel 1 before the containment vessel 1 is damaged. Alternatively, the operation and operation until the isolation valve 7 is opened and the isolation valve 6 and the isolation valve 7 are closed are substantially the same as those of the first embodiment of the filter vent device.

  After the isolation valve 6 or the isolation valve 7 is closed, the operator operates the nitrogen supply device 31 to open the nitrogen supply valve 32, supplies nitrogen into the inlet pipe 10 through the nitrogen supply pipe 33, and the inlet pipe. The inside of 10 is prevented from becoming a vacuum.

  Here, even if either the nitrogen supply device 31 or the nitrogen supply valve 32 does not operate for some reason, and the inlet pipe 10 is in a vacuum state, the check valve 36 operates and the exhaust tower 15 and the outlet pipe 14 and the vacuum release pipe 37, the outside air flows into the inlet pipe 10 and the vacuum state in the inlet pipe 10 is released.

  Further, during the standby operation, after opening the nitrogen discharge valve 34, the nitrogen supply device 31 is operated, the nitrogen supply valve 32 is opened, nitrogen is discharged from the pipe 35 to the outside, and then the nitrogen discharge valve 34 is closed. The inside of the filter vent device 20 is maintained in a nitrogen atmosphere.

  In the second embodiment of the filter vent device and the reactor containment vessel according to the present invention, after the isolation valve 6 or the isolation valve 7 is closed, the nitrogen supply device 31 is operated to open the nitrogen supply valve 32 to introduce nitrogen. By supplying the inside of the pipe 10, it is possible to prevent the inside of the inlet pipe 10 from being in a vacuum state. Even if the operator cannot perform nitrogen introduction work and nitrogen cannot be supplied to the inlet pipe 10, the check valve 36 operates immediately when the inlet pipe 10 is in a vacuum state. Then, the outside air flows into the inlet pipe 10, and the vacuum state in the inlet pipe 10 is eliminated without the operation of the operator, and is almost the same as in the first embodiment of the filter vent device and the reactor containment vessel described above. Effects can be obtained.

  Furthermore, according to the present embodiment, during the standby operation, after the nitrogen exhaust valve 34 is opened, the nitrogen supply device 31 is operated, the nitrogen supply valve 32 is opened, and nitrogen is exhausted from the pipe 35 to the outside. By closing the valve 34, the inside of the filter vent device 20 can be maintained in a nitrogen atmosphere. Therefore, even if hydrogen generated in the reactor core flows into the filter vent device 20 immediately after the start of the filter vent operation of the reactor containment vessel 1, formation of detonation due to hydrogen inflow can be avoided.

<Modification of Second Embodiment>
In the second embodiment of the filter vent device and the reactor containment vessel, in addition to the check valve 36 and the vacuum release pipe 37, the inlet pipe 10 is further provided with a nitrogen supply device 31 and a nitrogen supply valve 32. Although the provided nitrogen supply pipe 33 is connected, the second embodiment is not limited to this. Hereinafter, a modification of the second embodiment will be described with reference to FIG.
FIG. 3 is a longitudinal sectional view showing a schematic configuration of a modified example of the second embodiment of the reactor containment vessel and the filter vent apparatus according to the present invention.

  As shown in FIG. 3, in addition to the nitrogen supply device 31 and the nitrogen supply valve 32, another aspect of the second embodiment of the filter vent device and the reactor containment vessel of the present invention includes a pressure sensor 38 and a control unit 39. It is equipped with.

  The pressure sensor 38 is a sensor for detecting the pressure in the inlet pipe 10 and is provided in the pipe 10 </ b> A connected to the inlet pipe 10.

The control unit 39 takes in the detected value of the pressure sensor 38 (pressure in the inlet pipe 10), and when the detected value reaches a preset set value, sends an open signal to the nitrogen supply valve 32 to open the nitrogen supply valve 32. Output for.
In response to the input of the open signal, the nitrogen supply valve 32 is opened.

  Also in the filter vent device and the reactor containment vessel of such an embodiment, after the isolation valve 6 or the isolation valve 7 is closed, the nitrogen supply device 31 is operated to open the nitrogen supply valve 32 and nitrogen is introduced into the inlet pipe 10. When the supply or the inside of the inlet pipe 10 is in a vacuum state, the check valve 36 immediately operates and the outside air flows into the inlet pipe 10, thereby eliminating the vacuum state in the inlet pipe 10. Is done.

  Further, the pressure in the inlet pipe 10 is detected, and when the detected value reaches a preset set value, in order to control to open the nitrogen supply valve 32, the operator is closed after the isolation valve 6 or the isolation valve 7 is closed. However, it is not always necessary to operate the nitrogen supply device 31 to open the nitrogen supply valve 32, so that the inside of the inlet pipe 10 can be prevented from being in a vacuum state, and the inside of the reactor containment vessel filter vent device 20 can be nitrogenized. It is also easier to maintain in the atmosphere.

  In the second embodiment of the filter vent device and the reactor containment vessel of the present invention, the nitrogen supply pipe 33 provided with the nitrogen supply device 31 and the nitrogen supply valve 32 in the inlet pipe 10, Although a nitrogen supply system including the nitrogen supply pipe 33 provided with the nitrogen supply valve 32, the pressure sensor 38, and the control unit 39 is provided, the gas introduced into the inlet pipe 10 is not limited to nitrogen, such as air. A gas supply line for supplying other types of gas may be provided.

<Third Embodiment>
A third embodiment of the filter vent device and the reactor containment vessel of the present invention will be described with reference to FIG.
FIG. 4 is a longitudinal sectional view showing a schematic configuration of a third embodiment of a reactor containment vessel and a filter vent apparatus according to the present invention.

  The third embodiment of the filter vent device and the reactor containment vessel according to the present invention is also provided in the reactor containment vessel 1 in which the dry well 3 and the wet well 4 are present in a severe accident such as the reactor pressure vessel 2 being damaged. This reduces the pressure of the material and removes radioactive substances as much as possible.

  In the filter vent apparatus 20 of this embodiment, the vacuum release pipe 37 connected to the outlet pipe 14 in the first embodiment shown in FIG. 1 is released to the atmosphere.

  The configuration other than the vacuum release pipe 37A is substantially the same as the filter vent device and the reactor containment vessel of the first embodiment shown in FIG.

  The third embodiment of the filter vent device 20 of the present invention includes an isolation valve 6, an isolation valve 7, a vent pipe 8, a vent pipe 9, an inlet pipe 10, a filter container 12, a shielding wall 13, The outlet pipe 14, the exhaust cylinder 15, the check valve 36, and the vacuum release pipe 37 </ b> A are configured.

  Also in the third embodiment of the filter vent device and the reactor containment vessel of the present invention, when the inside of the inlet pipe 10 is in a vacuum state, the check valve 36 is activated, and the vacuum release pipe 37 is used. The outside air flows into the inlet pipe 10, and the vacuum state in the inlet pipe 10 is eliminated without the operator's operation, and the effect similar to that of the first embodiment of the filter vent device and the reactor containment vessel described above is obtained. can get.

  Also in the third embodiment, as in the second embodiment and its modifications, a nitrogen supply pipe 33 provided with a nitrogen supply device 31 and a nitrogen supply valve 32 in the inlet pipe 10, and a nitrogen supply A nitrogen supply system including the nitrogen supply pipe 33 provided with the device 31 and the nitrogen supply valve 32, the pressure sensor 38, and the control unit 39 can be provided, and the same effect can be obtained.

  In addition, this invention is not restricted to said embodiment, A various deformation | transformation and application are possible.

1 ... Reactor containment vessel,
2 ... Reactor pressure vessel,
3 ... Drywell,
4 ... Wetwell,
5 ... Suppression pool,
6, 7 ... Isolation valve,
8,9 ... Vent piping,
10 ... Inlet piping,
10A ... Piping,
11 ... Pool water,
12 ... Filter container,
13 ... Shielding wall,
14 ... exit piping,
15 ... exhaust pipe,
16 ... Rupture disc,
20 ... Filter vent device,
31 ... Nitrogen supply device,
32 ... Nitrogen supply valve,
33 ... Nitrogen supply piping,
34 ... Nitrogen discharge valve,
35 ... Nitrogen discharge piping,
36 ... Check valve,
37, 37A ... Vacuum release piping,
38 ... pressure gauge,
39: Controller.

Claims (7)

A filter vent device for a containment vessel,
A filter container having a filter for removing pool water and radioactive substances therein;
A vent pipe connected to a dry well and a wet well in the reactor containment vessel;
An isolation valve provided in the vent pipe;
One end is connected to the vent pipe, and the other end is an inlet pipe introduced into the pool water of the filter container;
An outlet pipe connected to the filter in the filter container;
A vacuum release means for releasing the vacuum generated in the inlet pipe by closing the isolation valve being opened after the filter vent operation of the reactor containment vessel and then introducing outside air into the inlet pipe; A reactor containment filter vent device characterized by comprising: A reactor vent vessel filter vent device according to claim 1,
The vacuum release means
One end is connected between the vent pipe and the filter container in the inlet pipe, and the other end is connected to the outlet pipe, a vacuum release pipe,
A filter vent device for a reactor containment vessel, comprising: a check valve provided in the vacuum releasing pipe and allowing only air flow from the outlet pipe to the inlet pipe. A reactor vent vessel filter vent device according to claim 1,
The vacuum release means
One end is connected between the vent pipe and the filter container in the inlet pipe, and the other end is released to the atmosphere, and a vacuum release pipe,
A filter vent device for a nuclear reactor containment vessel, comprising: a check valve provided in the vacuum release pipe and allowing only air flow from the other end released to the atmosphere to the inlet pipe. In the reactor containment vessel venting device according to claim 2 or 3,
A nitrogen supply pipe having one end connected between the vent pipe and the filter container in the inlet pipe;
A nitrogen supply device connected to the other end of the nitrogen supply pipe;
A reactor containment filter vent device, further comprising a nitrogen supply valve provided in the nitrogen supply pipe. In the reactor containment filter vent device according to claim 4,
A rupture disk provided at the outlet pipe and set pressure to operate at the time of reactor containment filter vent operation,
A nitrogen exhaust pipe connected to the outlet pipe;
A filter vent device for a reactor containment vessel, further comprising a nitrogen discharge valve provided in the nitrogen discharge pipe. In the reactor containment filter vent device according to claim 5,
A pressure sensor provided in the inlet pipe;
A reactor containment vessel, further comprising: a control unit that takes in a detection value of the pressure sensor and outputs an open signal to the nitrogen supply valve when the detection value reaches a preset setting value. Filter vent device.   A reactor containment vessel comprising the reactor vent containment filter vent device according to any one of claims 1 to 6.

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