JP2018169245A - Storage container maintenance facility and method for maintaining storage container - Google Patents

Abstract

To contain the radioactive noble gas in a storage container separately from the storage container and reduce the pressure in the storage container.SOLUTION: The present invention includes: a filter unit 2 for removing radioactive iodine or particulate radioactive substances from the gas in the storage container 100 storing a reactor pressure container 101 containing a reactor core in an airproof state; an air discharge pipe 3 connected to the filter unit 2 to be drawn out from the storage container 100; a first storage unit 11 connected to an end of the air discharge pipe 3 outside the storage container 100; a second storage unit 21 connected to an end of the air discharge pipe 3 outside the storage container 100, in parallel to the first storage unit 11; switching units (a first storage on-off valve 11C and a second storage on-off valve 21C) for switching the destination of the gas passing through the filter unit 2 to be sent to, to the first storage unit 11 or to the second storage unit 21; a first cooling unit 12 for condensing the vapor in the gas supplied into the first storage unit 11; and a second cooling unit 22 for condensing the vapor in the gas supplied into the second storage unit 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a containment vessel maintenance facility and a containment vessel maintenance method for ensuring the safety of a containment vessel in a severe accident in which a core is damaged and a molten core flows out of a reactor pressure vessel.

  Conventionally, as countermeasures assuming a severe accident in a nuclear power plant, for example, in Patent Document 1, a primary containment vessel for storing a reactor pressure vessel and a secondary containment of a reactor installed outside the primary reactor containment vessel A container, an air bag installed in the secondary containment vessel and capable of receiving and confining high-pressure gas released from the reactor primary containment vessel in the event of an accident in the reactor primary containment vessel, and the reactor A containment vessel is shown having a gas phase vent tube connecting the primary containment vessel and the airbag. In the containment vessel, after the airbag is expanded, the pressure of the high-pressure gas in the airbag and the pressure in the atmosphere of the secondary containment vessel are equalized, and the high-pressure gas in the airbag and the primary containment vessel is Confine statically.

  For example, Patent Document 2 discloses a vent of a nuclear facility and a hydrogen and radioactive substance containment system. This system is connected to a containment vessel with a vent pipe to relieve pressure in the event of a failure or accident, and to this vent pipe, a catalytic recombiner that converts hydrogen contained in the vent stream into steam with oxygen, a vent A wet scrubber or dry filter for separating aerosol from a stream and a plurality of adsorption towers containing radioactive noble gases contained in the vent stream, wherein at least one of the adsorption towers is separated from the vent stream and flushed It has been shown that radioactive noble gases that are operating and accumulated in the adsorption tower are fed back to the containment vessel by the flushing medium.

Japanese Patent No. 5238649 JP-T-2006-521843

  In the invention of Patent Document 1, high-pressure gas released from the reactor primary containment vessel at the time of an accident is received and confined by an air bag. However, even if the radioactive noble gas is sealed in the airbag, steam continues to be generated in the reactor primary containment vessel, and the pressure is increased by the steam, so that it is difficult to maintain the reactor primary containment vessel. In addition, high-pressure gas containing steam contains air in the primary containment vessel along with radioactive noble gas. Therefore, in order to contain all radioactive noble gas including steam in the primary containment vessel, the primary containment of the reactor A large-capacity airbag larger than the container and a secondary containment vessel will be required, resulting in a large-scale facility. Furthermore, the invention of Patent Document 1 says that the reactor secondary containment vessel is installed outside the reactor primary containment vessel, but because it is substantially in the same structure, the decommissioning work after the accident ended. The radioactive noble gas has to wait for the decay in the atmosphere (it takes a period longer than half-life, the dose of gamma rays from the radioactive noble gas released to the environment must be sufficiently small and less than the control dose), The air bag in the secondary containment vessel in which the rare gas is stored becomes the cause of hindering the dismantling of the plant and delays the decommissioning work.

  In the invention of Patent Document 2, the radioactive noble gas is confined in the adsorption tower, but the radioactive noble gas is fed back to the containment vessel by flushing. However, when decommissioning a containment reactor where an accident has occurred, radioactive noble gases are present in the containment vessel, which hinders decommissioning operations.

  The present invention solves the above-described problems, and provides a containment vessel maintenance facility and a containment vessel maintenance method capable of containing radioactive noble gas in a containment vessel separately from the containment vessel and reducing the pressure in the containment vessel. The purpose is to provide.

  In order to achieve the above-described object, a containment vessel maintenance facility according to one aspect of the present invention provides a radioactive iodine or particulate matter from a gas inside a containment vessel that stores a reactor pressure vessel containing a reactor core in an airtight state. A filter unit for removing radioactive substances, an exhaust pipe connected to the filter unit and drawn out of the containment vessel, and a first connected to an end of the exhaust pipe outside the containment vessel A storage unit; a second storage unit connected to an end of the exhaust pipe outside the storage container in parallel with the first storage unit; and a destination of the gas that has passed through the filter unit. Or the switching part switched to said 2nd storage part, the 1st cooling part which condenses the vapor | steam in the gas supplied to said 1st storage part, and condenses the vapor | steam in the gas supplied to said 2nd storage part With the second cooling section Having.

  According to this containment vessel maintenance facility, the gas from which radioactive iodine and particulate radioactive material have been removed by the filter unit is sent out from the containment vessel through the exhaust pipe and switched by the switching unit to be switched to the first storage unit or the second storage unit. Sent to the second reservoir. When gas is first sent to the first reservoir, non-condensable gas containing radioactive noble gas is stored in the first reservoir, and vapor that is condensable gas is condensed by the first cooling unit. For this reason, the pressure inside the containment vessel that has risen due to the accident can be reduced while the radioactive noble gas generated inside the containment vessel due to the accident is contained in the first reservoir. Thereafter, the gas sent to the second reservoir is air that is a non-condensable gas and steam that is a condensable gas. In the second reservoir, the non-condensable gas is stored and the second cooling unit steams. Is condensed. For this reason, the pressure inside the storage container can be reduced. As a result, the radioactive noble gas inside the containment vessel can be contained separately from the containment vessel, and the pressure inside the containment vessel can be reduced. In addition, according to the containment vessel maintenance facility, since the first storage unit is provided separately from the containment vessel, the first storage unit in which radioactive noble gas is stored in the decommissioning operation disassembles the containment vessel. It does not cause obstruction.

  In the containment vessel maintenance facility according to one aspect of the present invention, a first condensed water delivery unit that sends the condensed water of the first storage unit condensed by the first cooling unit to the containment vessel, and the first storage unit. A first reservoir water level detector that detects the level of condensed water in the unit, a second condensed water delivery unit that sends the condensed water of the second reservoir condensed by the second cooling unit to the containment vessel, and It is preferable to have a second reservoir water level detector that detects the level of condensed water in the second reservoir.

  According to this containment vessel maintenance facility, the water level of the condensed water in the first reservoir can be managed by the first reservoir water level detector, and the capacity for storing non-condensable gas in the first reservoir is ensured. Can do. Further, the first condensate delivery unit can supply the condensate in the first reservoir as cooling water inside the containment vessel, and the temperature and pressure of the containment vessel can be reduced. Since the radioactive noble gas stored in the first storage part is a non-condensable gas and is not contained in the condensed water, it is possible to prevent the radioactive noble gas from being returned to the storage container. On the other hand, the water level of the condensed water in the second reservoir can be managed by the second reservoir water level detector, and the capacity for storing the non-condensable gas in the second reservoir can be ensured. Further, the condensed water in the second storage part can be supplied as cooling water inside the storage container by the second condensed water delivery part, and the temperature and pressure of the storage container can be reduced.

  In the containment vessel maintenance facility according to one aspect of the present invention, the branch exhaust pipe connected to the first storage section, the branch exhaust on-off valve provided in the branch exhaust pipe, and the branch exhaust pipe are provided. It is preferable to have a radiation detector and an exhaust pipe provided at the end of the branch exhaust pipe.

  According to this containment vessel maintenance facility, after the radioactive noble gas stored in the first storage part is attenuated by long-term storage, the branch exhaust opening / closing valve is opened while monitoring the radiation dose by the radiation detection part and branched. Controlled discharge can be performed from the exhaust pipe through the exhaust pipe.

In the containment vessel maintenance facility according to one aspect of the present invention, the pressure P ₀ before the accident inside the containment vessel, the capacity V ₀ of the containment vessel, and the temperature T ₀ inside the containment vessel before the accident are stored. The relationship P ₀ · V ₀ / T ₀ , the pressure P ₁ before the accident inside the first reservoir, the capacity V ₁ of the first reservoir, and the temperature T ₁ before the accident inside the first reservoir The relationship P ₁ · V ₁ / T ₁ , the assumed pressure P ′ ₁ after the accident inside the first reservoir, the capacity V ′ ₁ of the first reservoir, and the accident inside the first reservoir assumed the temperature T _'1 and relation _{P' 1 · V '1 /} T' 1 from the resulting equation _{(P 0 · V 0 / T} 0) + (P 1 · V 1 / T 1) = P '1 · In V ′ ₁ / T ′ ₁ , it is preferable to set V ₁ corresponding to P ′ ₁ by substituting P ₀ = P ₁ , T ₀ = T ₁ , and V ₁ = V ′ ₁ .

According to this containment vessel maintenance facility, the capacity V of the first reservoir is such that the total amount of non-condensable gas inside the containment vessel can be sent to the first reservoir from a constant relationship of pressure × volume / temperature = constant. ₁ is set. In this way, when the pressure inside the containment vessel and the pressure inside the first reservoir are equalized, the total amount of non-condensable gas inside the containment vessel (including radioactive noble gas) is reduced. It can be sent to the first reservoir. In this way, since the gas inside the containment vessel is sent to the first storage part by a pressure difference, there is no need to use a machine such as a pump.

  In order to achieve the above-described object, a containment vessel maintenance method according to an aspect of the present invention includes a radioactive iodine or particulate matter from a gas inside a containment vessel that stores a reactor pressure vessel containing a reactor core in an airtight state. A filter unit for removing radioactive substances, an exhaust pipe connected to the filter unit and drawn out of the containment vessel, and a first connected to an end of the exhaust pipe outside the containment vessel A storage unit; a second storage unit connected to an end of the exhaust pipe outside the storage container in parallel with the first storage unit; and a destination of the gas that has passed through the filter unit. Or the switching part switched to said 2nd storage part, the 1st cooling part which condenses the vapor | steam in the gas supplied to said 1st storage part, and condenses the vapor | steam in the gas supplied to said 2nd storage part With the second cooling section A containment vessel maintenance method using a containment vessel maintenance facility comprising: storing gas inside the containment vessel in the first storage unit by switching the switching unit in the event of an accident, and gas in the first cooling unit Next to the first step for condensing the steam therein, and after the first step, the second cooling unit stores the gas inside the storage container in the second storage unit by switching the switching unit, and the second cooling unit stores the gas in the gas. A second step of condensing the vapor.

  According to this containment vessel maintenance method, in the first step, the gas from which radioactive iodine or particulate radioactive material has been removed by the filter unit is sent out from the containment vessel through the exhaust pipe and is switched by the switching unit. Sent to one reservoir. In the first storage part, non-condensable gas containing radioactive noble gas is stored, and vapor that is condensable gas is condensed by the first cooling part. For this reason, the pressure inside the containment vessel that has risen due to the accident can be reduced while the radioactive noble gas generated inside the containment vessel due to the accident is contained in the first reservoir. Thereafter, in the second step, the gas sent to the second reservoir is air that is a non-condensable gas and steam that is a condensable gas. In the second reservoir, the non-condensable gas is stored and The steam is condensed by the two cooling parts. For this reason, the pressure inside the storage container can be reduced. As a result, the radioactive noble gas inside the containment vessel can be contained separately from the containment vessel, and the pressure inside the containment vessel can be reduced. Moreover, according to the containment vessel maintenance method, since the first storage unit is provided separately from the containment vessel, the first storage unit in which radioactive noble gas is stored in the decommissioning operation is used to dismantle the containment vessel. It does not cause obstruction.

  Moreover, in the containment vessel maintenance method according to one aspect of the present invention, the containment vessel maintenance facility sends out the first condensed water that sends the condensed water in the first storage unit condensed by the first cooling unit to the containment vessel. A second storage section water level detection section that detects the level of condensed water in the first storage section, and a second section that sends the condensed water in the second storage section condensed by the second cooling section to the storage container. A condensate delivery unit, and a second reservoir water level detector that detects the level of condensed water in the second reservoir, and in the first step, the water level of the first reservoir water level detector Based on the detection, the condensed water in the first reservoir is sent to the storage container by the first condensed water delivery unit, and in the second step, the second condensed water is based on the detection of the water level by the second reservoir water level detector. The condensate in the second storage part is sent to the containment vessel by the delivery part. It is preferred.

  According to this containment vessel maintenance method, in the first step, the water level of the condensed water in the first reservoir can be managed by the first reservoir water level detector, and the non-condensable gas is stored in the first reservoir. Capacity can be secured. In the first step, the condensed water in the first reservoir can be supplied as cooling water inside the storage container by the first condensed water delivery section, and the temperature and pressure of the storage container can be reduced. Since the radioactive noble gas stored in the first storage part is a non-condensable gas and is not contained in the condensed water, it is possible to prevent the radioactive noble gas from being returned to the storage container. On the other hand, in the second step, the water level of the condensed water in the second reservoir can be managed by the second reservoir water level detector, and the capacity for storing the non-condensable gas in the second reservoir can be ensured. . In the second step, the condensed water in the second reservoir can be supplied as cooling water inside the containment vessel by the second condensate delivery unit, and the temperature and pressure of the containment vessel can be reduced.

  Further, in the containment vessel maintenance method according to an aspect of the present invention, the containment vessel maintenance facility includes a branch exhaust pipe connected to the first storage unit, a branch exhaust on / off valve provided in the branch exhaust pipe, A radiation detector provided in the branch exhaust pipe, and an exhaust pipe provided at the end of the branch exhaust pipe, and a predetermined period has elapsed after the first step and the second step. When the radioactive noble gas stored in the first storage part is attenuated, the branch exhaust on-off valve is opened and the radiation detection part detects the radiation dose, while the radiation exhaust gas is detected from the exhaust pipe through the branch exhaust pipe. It is preferable to include a third step of exhausting the gas stored in one storage part.

  According to this containment vessel maintenance method, after the radioactive noble gas stored in the first storage part has decayed due to long-term storage, the branch exhaust opening / closing valve is opened while monitoring the radiation dose by the radiation detection part, and then branched. Controlled discharge can be performed from the exhaust pipe through the exhaust pipe.

Further, in the containment vessel maintenance method according to one aspect of the present invention, the containment vessel maintenance facility includes a pressure P ₀ before the accident inside the containment vessel, a capacity V ₀ of the containment vessel, and an accident inside the containment vessel. Previous temperature T ₀ relationship between _{P 0 · V 0 / T 0} , the internal volume V ₁ and the first reservoir of the internal fault prior to the pressure P ₁ and the first storage unit of the first storage unit relationship P ₁ · V 1 _{/ T} 1 of the temperature T ₁ of the before the _accident, and assuming after internal accident of the first reservoir pressure P the _'1 and volume V of the first reservoir' and ₁ first Relationship with the assumed temperature T ′ ₁ after the accident inside the reservoir P ′ ₁ · V ′ ₁ / T ′ ₁ (P ₀ · V ₀ / T ₀ ) + (P ₁ · V ₁ / T) ₁₎ = P 'in _{1, P 0 = P 1,} T 0 = T 1, V 1 = V''1 · V' 1 / T V 1 corresponding to the P _'1 by substituting ₁ is set, And, A storage container pressure detection unit for detecting the internal pressure of the storage container, and a first storage unit pressure detection unit for detecting the internal pressure of the first storage unit, and in the first step, When the pressure detected by the containment vessel pressure detector and the pressure detected by the first reservoir pressure detector are equalized, it is preferable to switch to the second step by the switching unit.

According to this containment vessel maintenance method, the capacity V of the first reservoir is such that the entire amount of non-condensable gas inside the containment vessel can be sent to the first reservoir from a constant relationship of pressure × volume / temperature = constant. ₁ is set. For this reason, in the first step, when the pressure inside the containment vessel and the pressure inside the first reservoir are equalized, the total amount of non-condensable gas inside the containment vessel (including radioactive noble gas) May have been sent to the first reservoir. Thus, it can transfer to a 2nd process, without sending radioactive noble gas to a 2nd storage part.

  According to the present invention, the radioactive noble gas in the storage container can be contained separately from the storage container, and the pressure in the storage container can be reduced.

FIG. 1 is a configuration diagram of a containment container maintenance facility according to an embodiment of the present invention. FIG. 2 is a block diagram of the control system of the containment container maintenance facility according to the embodiment of the present invention. FIG. 3 is an operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 4 is an operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 5 is an operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 6 is an operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 7 is an operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 8 is an operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 9 is an operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 10 is an explanatory diagram for setting the capacity of the first storage unit in the containment vessel maintenance facility according to the embodiment of the present invention. FIG. 11 is a graph for setting the capacity of the first storage unit in the containment vessel maintenance facility according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a configuration diagram of a containment container maintenance facility according to the present embodiment.

  In FIG. 1, a containment vessel 100 stores a reactor pressure vessel 101 that houses a plurality of fuel assemblies that are a core in a sealed state in a nuclear facility. In the nuclear facility, steam is generated using the heat of high-temperature and high-pressure water heated in the reactor pressure vessel 101, and the steam turbine provided outside the containment vessel 100 is driven by this steam to generate electricity. Provide. The containment vessel 100 is erected on a solid ground such as a bedrock, and is firmly formed of reinforced concrete or the like, so that water vapor (hereinafter, referred to as steam) and air that are a predetermined volume of condensable gas are contained therein. In addition, a gas containing a non-condensable gas such as a radioactive noble gas can be contained within a predetermined pressure range.

  The containment vessel maintenance facility according to the present embodiment ensures the safety of the containment vessel 100 during a severe accident, which is a severe event in which the core is damaged and flows out of the reactor pressure vessel 101. The containment vessel maintenance facility includes a containment vessel pressure detection unit 1, a filter unit 2, an exhaust pipe 3, a first storage unit (rare gas storage unit) 11, a first cooling unit 12, and a first condensed water delivery unit. 13, first reservoir water level detector 14, first reservoir pressure detector 15, second reservoir (condensate reservoir) 21, second cooling unit 22, and second condensed water delivery unit 23 The second reservoir water level detector 24, the second reservoir pressure detector 25, and the exhaust unit 31 are provided.

  The filter unit 2 is provided inside the storage container 100 in the present embodiment. The filter unit 2 is provided with a filter inside the casing for capturing radioactive iodine and particulate radioactive material contained in the gas. The filter unit 2 allows the gas inside the storage container 100 to pass through the casing, thereby removing radioactive iodine and particulate radioactive material in the gas by the filter. However, radioactive noble gases such as xenon (Xe) and krypton (Kr), vapor and air cannot pass through the casing because they cannot be captured by the filter. Therefore, the filter unit 2 captures and removes radioactive iodine and particulate radioactive substances, while allowing gas containing condensable gas such as vapor and air, and non-condensable gases such as radioactive noble gases to pass through.

  The exhaust pipe 3 is connected to the filter unit 2, and an end portion is provided outside the storage container 100. In the middle of the exhaust pipe 3, an exhaust opening / closing valve 3 </ b> A is provided inside the storage container 100, and an exhaust opening / closing valve 3 </ b> B is provided in a portion drawn out of the storage container 100. The exhaust on-off valves 3A and 3B open the exhaust pipe 3 by an opening operation and close the exhaust pipe 3 by a closing operation. Further, the exhaust on-off valves 3A and 3B are automatic valves, which open when an open signal is input, and close when an close signal is input. Therefore, when the exhaust on / off valves 3A and 3B are opened to open the exhaust pipe 3, the gas inside the storage container 100 is discharged to the outside of the storage container 100 through the filter unit 2. Further, when any of the exhaust opening / closing valves 3A and 3B is closed and the exhaust pipe 3 is closed, the gas inside the storage container 100 remains without being discharged to the outside of the storage container 100. The exhaust on-off valves 3A and 3B function as isolation valves that isolate the containment vessel 100 from the inside and the outside.

  The first storage unit 11 includes a first storage pipe 11A, a first storage tank 11B, and a first storage on-off valve 11C.

  11 A of 1st storage piping is connected to the edge part from which the exhaust piping 3 was pulled out of the storage container 100. As shown in FIG.

  The first storage tank 11B is connected to the end of the first storage pipe 11A. The first storage tank 11B is a sealed container whose capacity does not change.

  The first storage opening / closing valve 11C is provided in the middle of the first storage piping 11A, opens the first storage piping 11A by an opening operation, and closes the first storage piping 11A by a closing operation. The first storage on-off valve 11C is an automatic valve, and opens when an open signal is input, and closes when an open signal is input. Further, the first storage on-off valve 11C may not be an automatic valve. Accordingly, when the first storage opening / closing valve 11C is opened to open the first storage pipe 11A, the gas discharged from the inside of the storage container 100 through the exhaust pipe 3 is sent to the first storage tank 11B. . Further, the first storage on / off valve 11C is closed to close the first storage pipe 11A, so that the gas discharged from the inside of the storage container 100 through the exhaust pipe 3 is sent to the first storage tank 11B. I can't.

  The first cooling unit 12 includes a circulation pipe 12A, a heat exchanger 12B, a cooling pump 12C, a sprinkler 12D, and first cooling on / off valves 12E and 12F.

  One end of the circulation pipe 12A is connected to the inside of the first storage tank 11B at the lower part of the first storage tank 11B, and the other end is connected to the inside of the first storage tank 11B at the upper part of the first storage tank 11B. The first storage tank 11B is provided in a loop shape.

  The heat exchanger 12B is provided in the middle of the circulation pipe 12A, and a heat transfer tube interposed in the middle of the circulation pipe 12A is provided in the casing to which the cooling water is supplied. The cooling water supplied to the heat exchanger 12B includes, for example, seawater and lake water, and is supplied by a cooling water supply pump (not shown) and returned to the sea and lake through the inside of the casing. A heat exchanger for intermediate cooling may be interposed between the heat exchanger 12B and the cooling water supplied to the heat exchanger 12B. The cooling water supplied to the heat exchanger for intermediate cooling is, for example, pure water.

  The cooling pump 12C is provided in the middle of the circulation pipe 12A, and returns the fluid stored in the lower part of the first storage tank 11B to the upper part of the first storage tank 11B via the heat exchanger 12B by the circulation pipe 12A. . Therefore, the fluid stored in the lower part of the first storage tank 11B is sent to the circulation pipe 12A by the cooling pump 12C, cooled via the heat exchanger 12B, and returned to the upper part of the first storage tank 11B.

  Sprinkler 12D is what is called a shower, provided in the upper part of the inside of the 1st storage tank 11B, and connected to the other end of circulation piping 12A. Therefore, the fluid sent to the circulation pipe 12A by the cooling pump 12C and returned to the upper part of the first storage tank 11B is sprinkled toward the lower part of the first storage tank 11B by the sprinkler 12D. As described above, the vapor contained in the gas inside the storage container 100 is sent to the first storage tank 11B. Therefore, the steam is condensed by the fluid sprinkled by the sprinkler 12D to become condensed water. This condensed water is stored in the lower part of the first storage tank 11B, sent to the circulation pipe 12A by the cooling pump 12C, cooled via the heat exchanger 12B, and returned to the upper part of the first storage tank 11B. Become fluid.

  The 1st cooling on-off valve 12E is provided in the other end side (upper side of the 1st storage tank 11B) rather than heat exchanger 12B in circulation piping 12A. The first cooling on / off valve 12F is provided on one end side (the lower side of the first storage tank 11B) of the circulation pipe 12A with respect to the cooling pump 12C. The first cooling on / off valves 12E and 12F open the circulation pipe 12A by an opening operation and close the circulation pipe 12A by a closing operation. Further, the first cooling on / off valves 12E and 12F are automatic valves, which are opened by inputting an open signal, and are closed by inputting a close signal. The first cooling on / off valves 12E and 12F may not be automatic valves. Accordingly, the first cooling on-off valves 12E and 12F are opened to open the circulation pipe 12A, so that the condensed water inside the first storage tank 11B is circulated through the circulation pipe 12A by the heat exchanger 12B. To be cooled. Further, the first cooling on / off valves 12E and 12F are closed to close the circulation pipe 12A, so that the condensed water inside the first storage tank 11B is not circulated or cooled. The first cooling on / off valve 12E opens or closes the circulation pipe 12A between the heat exchanger 12B and the upper part of the first storage tank 11B. The first cooling on / off valve 12F opens or closes the circulation pipe 12A between the lower portion of the first storage tank 11B and the cooling pump 12C.

  The first condensed water delivery unit 13 has a delivery pipe 13A, a delivery pump 13B, delivery opening / closing valves 13C and 13D, and a check valve 13E.

  One end of the delivery pipe 13A is connected to the inside of the first storage tank 11B at the lower part of the first storage tank 11B, and the other end is provided to the inside of the storage container 100.

  The delivery pump 13B is provided in the middle of the delivery pipe 13A, and sends the condensed water stored in the lower part of the first storage tank 11B to the inside of the storage container 100 through the delivery pipe 13A.

  The delivery opening / closing valve 13C is provided on one end side (first storage tank 11B side) of the delivery pipe 13A with respect to the delivery pump 13B. In addition, the delivery opening / closing valve 13D is provided on the delivery pipe 13A at the other end side (the storage container 100 side) from the delivery pump 13B and arranged outside the storage container 100. These delivery on / off valves 13C and 13D open the delivery pipe 13A by an opening operation and close the delivery pipe 13A by a closing operation. Further, the delivery on / off valves 13C and 13D are automatic valves, which open by an input of an open signal, and close by an input of a close signal. Further, the delivery on / off valve 13C may not be an automatic valve. Therefore, when the delivery opening / closing valves 13C and 13D are opened to open the delivery pipe 13A, the condensed water inside the first storage tank 11B is delivered to the storage container 100 via the delivery pipe 13A. Further, any one of the delivery opening / closing valves 13C and 13D is closed and the delivery pipe 13A is closed, so that the condensed water inside the first storage tank 11B is not delivered to the storage container 100. The delivery opening / closing valve 13C opens or closes the delivery pipe 13A between the lower portion of the first storage tank 11B and the delivery pump 13B. Further, the delivery opening / closing valve 13D opens or closes the delivery pipe 13A between the delivery pump 13B and the storage container 100. The delivery opening / closing valve 13D is provided closest to the storage container 100 and functions as an isolation valve that isolates the storage container 100 from the outside.

  The check valve 13E is connected to the other end of the delivery pipe 13A inside the storage container 100. The check valve 13E causes condensed water sent out from the other end of the delivery pipe 13A to the inside of the storage container 100 to flow into the storage container 100, but stores the fluid inside the storage container 100 from the other end of the delivery pipe 13A. Do not leak outside the container 100. Accordingly, the check valve 13E functions as an isolation valve that isolates the storage container 100 from the inside.

  The first reservoir water level detector 14 detects the level of condensed water stored in the first reservoir tank 11 </ b> B in the first reservoir 11.

  The first reservoir pressure detector 15 detects the pressure inside the first reservoir tank 11 </ b> B in the first reservoir 11.

  The second storage unit 21 includes a second storage pipe 21A, a second storage tank 21B, and a second storage on-off valve 21C.

  21 A of 2nd storage piping is connected in parallel with 11 A of 1st storage piping in the 1st storage part 11 with respect to the edge part from which the exhaust piping 3 was pulled out of the storage container 100. As shown in FIG. That is, the second storage pipe 21 </ b> A is branched and connected to the first storage pipe 11 </ b> A at the end from which the exhaust pipe 3 is drawn out of the storage container 100.

  The second storage tank 21B is connected to the end of the second storage pipe 21A. The second storage tank 21B is a sealed container whose capacity does not change.

  The second storage on-off valve 21C is provided in the middle of the second storage pipe 21A, opens the second storage pipe 21A by an opening operation, and closes the second storage pipe 21A by a closing operation. The second storage on-off valve 21C is an automatic valve that opens when an open signal is input, and closes when a close signal is input. Further, the second storage on-off valve 21C may not be an automatic valve. Therefore, the gas discharged from the inside of the storage container 100 via the exhaust pipe 3 is sent to the second storage tank 21B by opening the second storage on-off valve 21C and opening the second storage pipe 21A. . Further, the second storage on / off valve 21C is closed to close the second storage pipe 21A, so that the gas discharged from the inside of the storage container 100 through the exhaust pipe 3 is sent to the second storage tank 21B. I can't.

  The second cooling unit 22 includes a circulation pipe 22A, a heat exchanger 22B, a cooling pump 22C, a sprinkler 22D, and second cooling on / off valves 22E and 22F.

  One end of the circulation pipe 22A is connected to the inside of the second storage tank 21B at the lower part of the second storage tank 21B, and the other end is connected to the inside of the second storage tank 21B at the upper part of the second storage tank 21B. The second storage tank 21B is provided in a loop shape. In the present embodiment, the circulation pipe 22A is configured to share a part of the circulation pipe 12A in the first cooling unit 12 described above. Specifically, the circulation pipe 22A has one end connected between the heat exchanger 12B and the first cooling on-off valve 12E in the circulation pipe 12A, and the other end on the second storage tank 21B. It has cooling piping 22Aa connected to the inside. The circulation pipe 22A has one end connected to the inside of the second storage tank 21B at the lower part of the second storage tank 21B, and the other end between the cooling pump 12C and the first cooling on-off valve 12F in the circulation pipe 12A. It has a connected cooling pipe 22Ab. That is, the circulation pipe 22A includes the cooling pipes 22Aa and 22Ab so that a part of the circulation pipe 12A in the first cooling unit 12, the heat exchanger 12B, and the cooling pump 12C are shared.

  The heat exchanger 22B is provided in the middle of the circulation pipe 22A, and a heat transfer tube interposed in the middle of the circulation pipe 22A is provided in the casing to which the cooling water is supplied. The cooling water supplied to the heat exchanger 22B includes, for example, seawater and lake water, and is supplied by a cooling water supply pump (not shown) and returned to the sea and lake through the inside of the casing. The heat exchanger 22B is configured to share the heat exchanger 12B in the first cooling unit 12 as described above. A heat exchanger for intermediate cooling may be interposed between the heat exchanger 22B and the cooling water supplied to the heat exchanger 22B. The cooling water supplied to the heat exchanger for intermediate cooling is, for example, pure water.

  The cooling pump 22C is provided in the middle of the circulation pipe 22A, and returns the fluid stored in the lower part of the second storage tank 21B to the upper part of the second storage tank 21B via the heat exchanger 22B by the circulation pipe 22A. . Therefore, the fluid stored in the lower part of the second storage tank 21B is sent to the circulation pipe 22A by the cooling pump 22C, cooled through the heat exchanger 22B, and returned to the upper part of the second storage tank 21B. As described above, the cooling pump 22C is configured to share the cooling pump 12C in the first cooling unit 12.

  Sprinkler 22D is what is called a shower, Comprising: It is provided in the upper part inside 2nd storage tank 21B, and is connected to the other end of circulation piping 22A (cooling piping 22Aa). Therefore, the fluid sent to the circulation pipe 22A by the cooling pump 22C and returned to the upper part of the second storage tank 21B is sprinkled toward the lower part of the second storage tank 21B by the sprinkler 22D. As described above, the vapor contained in the gas inside the storage container 100 is sent to the second storage tank 21B. Therefore, the steam is condensed by the fluid sprinkled by the sprinkler 22D to become condensed water. The condensed water is stored in the lower part of the second storage tank 21B, sent to the circulation pipe 22A by the cooling pump 22C, cooled via the heat exchanger 22B, and returned to the upper part of the second storage tank 21B. Become fluid.

  The 2nd cooling on-off valve 22E is provided in cooling piping 22Aa used as the other end side (upper side of the 2nd storage tank 21B) rather than heat exchanger 22B in circulation piping 22A. Further, the second cooling on-off valve 22F is provided in the cooling pipe 22Ab that is one end side (the lower side of the second storage tank 21B) of the circulation pipe 22A than the cooling pump 22C. The second cooling on / off valves 22E and 22F open the circulation pipe 22A by an opening operation and close the circulation pipe 22A by a closing operation. Further, the second cooling on / off valves 22E and 22F are automatic valves, which are opened by inputting an open signal, and are closed by inputting a close signal. Further, the second cooling on / off valves 22E and 22F may not be automatic valves. Accordingly, the second cooling on-off valves 22E and 22F are opened to open the circulation pipe 22A, so that the condensed water inside the second storage tank 21B is circulated through the circulation pipe 22A by the heat exchanger 22B. To be cooled. Further, the second cooling on / off valves 22E and 22F are closed to close the circulation pipe 22A, so that the condensed water inside the second storage tank 21B is not circulated or cooled. The second cooling on / off valve 22E opens or closes the circulation pipe 22A between the heat exchanger 22B and the upper part of the second storage tank 21B. The second cooling on / off valve 22F opens or closes the circulation pipe 22A between the lower portion of the second storage tank 21B and the cooling pump 22C.

  The second condensed water delivery unit 23 includes a delivery pipe 23A, a delivery pump 23B, delivery opening / closing valves 23C and 23D, and a check valve 23E.

  One end of the delivery pipe 23A is connected to the inside of the second storage tank 21B at the lower part of the second storage tank 21B, and the other end is provided to the inside of the storage container 100. In the present embodiment, the delivery pipe 23A is configured to share a part of the delivery pipe 13A in the first condensed water delivery unit 13 described above. Specifically, the delivery pipe 23A has one end connected to the inside of the second storage tank 21B below the second storage tank 21B, and the other end between the delivery pump 13B and the delivery opening / closing valve 13C in the delivery pipe 13A. It has a connected delivery pipe 23Aa. That is, the delivery pipe 23A includes the connection delivery pipe 23Aa, and thus shares a part of the delivery pipe 13A, the delivery pump 13B, the delivery on-off valve 13D, and the check valve 13E in the first condensed water delivery unit 13. Has been.

  The delivery pump 23B is provided in the middle of the delivery pipe 23A, and sends the condensed water stored in the lower part of the second storage tank 21B into the storage container 100 through the delivery pipe 23A. The delivery pump 23B is configured to share the delivery pump 13B in the first condensed water delivery unit 13 as described above.

  The delivery opening / closing valve 23C is provided on one end side (second storage tank 21B side) of the delivery pipe 23A with respect to the delivery pump 23B. In addition, the delivery opening / closing valve 23D is provided on the delivery pipe 23A on the other end side (the storage container 100 side) from the delivery pump 23B and arranged outside the storage container 100. The delivery opening / closing valves 23C and 23D open the delivery pipe 23A by an opening operation and close the delivery pipe 23A by a closing operation. Further, the delivery on / off valves 23C and 23D are automatic valves, which open by an input of an open signal, and close by an input of a close signal. Further, the delivery opening / closing valve 23C may not be an automatic valve. Therefore, when the delivery opening / closing valves 23C and 23D are opened to open the delivery pipe 23A, the condensed water inside the second storage tank 21B is delivered to the storage container 100 through the delivery pipe 23A. Further, any one of the delivery opening / closing valves 23C and 23D is closed and the delivery pipe 23A is closed, so that the condensed water inside the second storage tank 21B is not delivered to the storage container 100. The delivery opening / closing valve 23C opens or closes the delivery pipe 23A between the lower part of the second storage tank 21B and the delivery pump 23B. The delivery opening / closing valve 23D opens or closes the delivery pipe 23A between the delivery pump 23B and the storage container 100. The delivery opening / closing valve 23D is provided closest to the storage container 100 and functions as an isolation valve that isolates the storage container 100 from the outside. As described above, the delivery opening / closing valve 23D is configured to share the delivery opening / closing valve 13D in the first condensed water delivery unit 13.

  The check valve 23E is connected to the other end of the delivery pipe 23A inside the storage container 100. The check valve 23E causes the condensed water sent out from the other end of the delivery pipe 23A to the inside of the storage container 100 to flow into the storage container 100, but stores the fluid inside the storage container 100 from the other end of the delivery pipe 23A. Do not leak outside the container 100. Therefore, the check valve 23E functions as an isolation valve that isolates the storage container 100 from the inside. As described above, the check valve 23E is configured to share the check valve 13E in the first condensed water delivery unit 13.

  The second reservoir water level detector 24 detects the level of condensed water stored in the second reservoir tank 21 </ b> B in the second reservoir 21.

  The second reservoir pressure detector 25 detects the internal pressure of the second reservoir 21 </ b> B in the second reservoir 21.

  The exhaust unit 31 includes a branch exhaust pipe 31A, an exhaust cylinder 31B, a branch exhaust on / off valve 31C, a throttle valve 31D, and a radiation detection unit 31E.

  The branch exhaust pipe 31 </ b> A is branched from the end of the exhaust pipe 3. Specifically, the branch exhaust pipe 31A is a part of the exhaust pipe 3 where the exhaust on-off valve 3B is connected to the first storage pipe 11A of the first storage part 11 and the second storage pipe 21A of the second storage part 21. Branching between and. Note that the branch exhaust pipe 31A may be provided between the portion of the first storage pipe 11A of the first storage section 11 that is connected to the exhaust pipe 3 and the first storage on-off valve 11C. Good. That is, the branch exhaust pipe 31 </ b> A is provided so as to be connected to at least the first storage tank 11 </ b> B of the first storage unit 11.

  The exhaust cylinder 31B is a so-called chimney, and is provided at the tip (end) of the branch exhaust pipe 31A.

  The branch exhaust opening / closing valve 31C is provided in the middle of the branch exhaust pipe 31A, opens the branch exhaust pipe 31A by an opening operation, and closes the branch exhaust pipe 31A by a closing operation. The branch exhaust opening / closing valve 31C is an automatic valve, and opens when an open signal is input, and closes when a close signal is input. Further, the branch exhaust opening / closing valve 31C may not be an automatic valve. Therefore, when the branch exhaust opening / closing valve 31C is opened and the branch exhaust pipe 31A is opened, the exhaust pipe 3 side communicates with the exhaust cylinder 31B via the branch exhaust pipe 31A. Further, the branch exhaust opening / closing valve 31C is closed and the branch exhaust pipe 31A is closed, so that the exhaust pipe 3 side and the exhaust cylinder 31B do not communicate with each other via the branch exhaust pipe 31A.

  The throttle valve 31D is formed of, for example, an orifice provided in the middle of the branch exhaust pipe 31A, and suppresses the flow rate of the fluid passing through the branch exhaust pipe 31A. The throttle valve 31D is provided between a portion of the branch exhaust pipe 31A connected to the exhaust pipe 3 and the branch exhaust on-off valve 31C. The throttle valve 31D may be provided between the exhaust cylinder 31B and the branch exhaust opening / closing valve 31C in the branch exhaust pipe 31A.

  The radiation detector 31E is provided in the middle of the branch exhaust pipe 31A and detects the radiation dose of the fluid passing through the branch exhaust pipe 31A. The radiation detector 31E is provided between the exhaust cylinder 31B and the branch exhaust on-off valve 31C in the branch exhaust pipe 31A.

  FIG. 2 is a block diagram of a control system of the containment container maintenance facility according to the present embodiment.

  The containment container maintenance facility having the above-described configuration is controlled by the control unit 41 in an integrated manner. The control unit 41 includes a microprocessor such as a CPU (Central Processing Unit), a memory such as a ROM and a RAM, and a storage. As shown in FIG. 2, the control unit 41 includes a containment vessel pressure detection unit 1, a first storage unit water level detection unit 14, a first storage unit pressure detection unit 15, a second storage unit water level detection unit 24, and a second storage unit. By inputting detection signals from the pressure detector 25 and the radiation detector 31E, the cooling water supply pumps of the heat exchangers 12B and 22B, the first cooling on / off valves 12E and 12F, the cooling pumps 12C and 22C, and the exhaust on / off valve 3A, 3B, first storage on-off valve 11C, delivery on-off valve 13C, delivery on-off valves 13D, 23D, delivery pumps 13B, 23B, second cooling on-off valves 22E, 22F, second storage on-off valve 21C, delivery on-off valve 23C, A signal for driving the branch exhaust on-off valve 31C is output.

  Hereinafter, the storage container maintenance method which is the control of the storage container maintenance facility by the control unit 41 will be described with reference to the operation diagrams of the storage container maintenance facility according to the present embodiment of FIGS.

  Before the accident, as shown in FIG. 3, the control unit 41 outputs a signal for stopping the cooling water supply pumps, the cooling pumps 12C and 22C, and the delivery pumps 13B and 23B of the heat exchangers 12B and 22B. The first cooling on / off valves 12E and 12F, the exhaust on / off valves 3A and 3B, the first storage on / off valve 11C, the delivery on / off valve 13C, the delivery on / off valves 13D and 23D, the second cooling on / off valves 22E and 22F, and the second storage on / off valve 21C, a closing signal for closing the delivery opening / closing valve 23C and the branch exhaust opening / closing valve 31C is output.

  In the event of a severe accident that damages the reactor core, a plurality of measures are taken to protect the containment vessel 100 such that cooling water is supplied into the containment vessel 100 after the core damage. However, even if a plurality of containment vessel protection measures are implemented, the progress of the event cannot be stopped, and the pressure inside the containment vessel 100 reaches near the design limit pressure.

  Therefore, in the event of a severe accident, the control unit 41 outputs a drive signal for driving the cooling water supply pump to supply the cooling water to the heat exchanger 12B. Moreover, the control part 41 outputs the open signal which opens the 1st cooling on-off valves 12E and 12F in order to circulate the water of the 1st storage tank 11B. The control unit 41 outputs a drive signal for driving the cooling pump 12C. That is, as shown in FIG. 4, in the first cooling unit 12, the water stored in the lower part of the first storage tank 11B circulates in the loop-shaped circulation pipe 12A including the first storage tank 11B, and the heat exchanger It cools via 12B and returns to the upper part of the 1st storage tank 11B.

  Thereafter, when the internal pressure of the storage container 100 detected by the storage container pressure detection unit 1 becomes the design limit pressure, the control unit 41 opens the exhaust on-off valves 3A and 3B and the first storage on-off valve 11C. Output an open signal. That is, as shown in FIG. 5, the gas inside the containment vessel 100 from which radioactive iodine or particulate radioactive material has been removed through the filter unit 2 (vapor and air as condensable gases, radioactive noble gases, etc.) Gas containing non-condensable gas) is sent to the first storage tank 11B. And in the inside of the 1st storage tank 11B, while non-condensable gas, such as air and radioactive noble gas, is stored, vapor | steam is cooled with the water circulated by the 1st cooling part 12, and it accumulates as condensed water condensed. .

  When the steam is received in the first storage tank 11B, the tank water level rises due to the condensed moisture. Therefore, when the water level of the condensed water stored in the first storage tank 11 </ b> B detected by the first storage part water level detection unit 14 exceeds the predetermined water level, the control unit 41 controls the delivery on / off valve of the first condensed water delivery unit 13. An open signal for opening 13C and 13D is output. Further, the control unit 41 outputs a signal for driving the delivery pump 13B of the first condensed water delivery unit 13. That is, as shown in FIG. 6, the condensed water stored in the first storage tank 11 </ b> B is sent out to the storage container 100. Further, when the level of condensed water stored in the first storage tank 11B detected by the first storage unit water level detection unit 14 has dropped to a predetermined water level, the control unit 41 sends out the delivery pump 13B of the first condensed water delivery unit 13. Is output, and a closing signal for closing the delivery on / off valves 13C and 13D is output (returns to the operation shown in FIG. 5). By repeating this operation, the water level of the condensed water stored in the first storage tank 11B is maintained at a predetermined water level.

  The first storage tank 11B is initially at atmospheric pressure, but the pressure increases as non-condensable gas is stored. Therefore, the internal pressure of the first storage tank 11B detected by the first storage unit pressure detection unit 15 becomes substantially the same as the internal pressure of the storage container 100 detected by the storage container pressure detection unit 1, and When the internal pressure and the internal pressure of the first storage tank 11B are equalized, it is considered that the entire amount of radioactive noble gas generated in the containment vessel 100 is sent to the first storage tank 11B and stored (comparison). In the initial stage of the accident, the entire amount of radioactive noble gas is released into the containment vessel 100). In this case, the control unit 41 outputs a closing signal for closing the first storage opening / closing valve 11C. That is, the gas supply from the storage container 100 to the first storage tank 11B is stopped.

  Even if the entire amount of the non-condensable gas generated in the containment vessel 100 is sent to the first storage tank 11B, the pressure inside the containment vessel 100 rises although the limit pressure is not exceeded due to the generation of vapor as the condensable gas. Therefore, after outputting the closing signal for closing the first storage opening / closing valve 11C and stopping the gas supply from the storage container 100 to the first storage tank 11B, the control unit 41 supplies the cooling water to the heat exchanger 22B. A drive signal for driving the cooling water supply pump is supplied for supply (unnecessary because the drive signal is output to the heat exchanger 12B when the heat exchanger 22B shares the heat exchanger 12B). Further, the control unit 41 outputs a stop signal for stopping the cooling pump 12C in order to stop the circulation of water in the first storage tank 11B, and outputs a close signal for closing the first cooling on-off valves 12E and 12F. Further, the control unit 41 outputs an opening signal for opening the second cooling on / off valves 22E and 22F in order to circulate the water in the second storage tank 21B. Further, the control unit 41 outputs a drive signal for driving the cooling pump 22C (not necessary because the cooling pump 22C outputs a drive signal to the cooling pump 12C when the cooling pump 22C shares the cooling pump 12C). Further, the control unit 41 outputs an open signal for opening the second storage on-off valve 21C. That is, as shown in FIG. 7, the gas inside the containment vessel 100 from which radioactive iodine or particulate radioactive material has been removed through the filter unit 2 (condensable gas vapor and non-condensable gas). Gas containing air) is sent to the second storage tank 21B. In this case, since the entire amount of radioactive noble gas generated in the storage container 100 is sent to and stored in the first storage tank 11B, basically no radioactive noble gas is sent to the second storage tank 21B. Furthermore, as shown in FIG. 7, in the second cooling unit 22, water stored in the lower part of the second storage tank 21B circulates in the loop-shaped circulation pipe 22A including the second storage tank 21B, and the heat exchanger It cools via 22B and returns to the upper part of the 2nd storage tank 21B. For this reason, in the inside of the 2nd storage tank 21B, while air is stored, the vapor | steam is cooled with the water circulated by the 2nd cooling part 22, and it accumulates as condensed water condensed. Thereby, the pressure of the storage container 100 is reduced.

  Here, the first storage on-off valve 11C opens and closes the gas feed from the storage container 100 to the first storage tank 11B, and the second storage on-off valve 21C sends the gas feed from the storage container 100 to the second storage tank 21B. The first storage on-off valve 11C and the second storage on-off valve 21C are opened and closed, and the gas feed of the storage container 100 can be switched to the first storage tank 11B and the second storage tank 21B. Therefore, in the storage container maintenance facility of the present embodiment, the first storage on / off valve 11C and the second storage on / off valve 21C switch the gas feed of the storage container 100 to the first storage tank 11B or the second storage tank 21B. It is configured as.

  When the steam is received in the second storage tank 21B, the tank water level rises due to the condensed moisture. Therefore, when the level of the condensed water stored in the second storage tank 21 </ b> B detected by the second storage unit water level detection unit 24 exceeds the predetermined water level, the control unit 41 sends out the opening / closing valve of the second condensed water delivery unit 23. An open signal for opening 23C and 23D is output. Moreover, the control part 41 outputs the signal which drives the delivery pump 23B of the 2nd condensed water delivery part 23. FIG. That is, as shown in FIG. 8, the condensed water stored in the second storage tank 21 </ b> B is sent out to the storage container 100. Moreover, when the water level of the condensed water stored in the second storage tank 21 </ b> B detected by the second storage part water level detection unit 24 falls to a predetermined water level, the control unit 41 sends the delivery pump 23 </ b> B of the second condensed water delivery unit 23. Is output, and a closing signal for closing the delivery on / off valves 23C and 23D is output (returns to the operation shown in FIG. 7). By repeating this operation, the water level of the condensed water stored in the second storage tank 21B is maintained at a predetermined water level.

  The second storage tank 21B is initially at atmospheric pressure, but the pressure increases as air that is non-condensable gas is stored. Therefore, the control unit 41 manages the pressure inside the second storage tank 21 </ b> B detected by the second storage unit pressure detection unit 25. Then, when the increase in the pressure inside the storage container 100 detected by the storage container pressure detection unit 1 is suppressed, the control unit 41 closes all the open / close valves during the opening operation. And a signal for stopping all the pumps in operation are output (return to the state shown in FIG. 3).

  Thereafter, among the radioactive noble gases stored in the first storage tank 11B, xenon has a short half-life and a high dose. Krypton is not as high in dose as xenon, but has a long half-life, so that it is attenuated in a state of being stored in the first storage tank 11B for a long time. After the krypton is attenuated for several years, the gas stored in the first storage tank 11B is managed and released while monitoring the radiation dose. In this case, the control unit 41 outputs an opening signal for opening the first storage opening / closing valve 11C and the branch exhaust opening / closing valve 31C from the state shown in FIG. That is, as shown in FIG. 9, the gas stored in the first storage tank 11B whose pressure is higher than the atmospheric pressure reaches the branch exhaust pipe 31A from the first storage pipe 11A through a part of the exhaust pipe 3. While being controlled by the throttle valve 31D, the air is discharged from the exhaust pipe 31B to the atmosphere. However, the control unit 41 closes the first storage on-off valve 11C and the branch exhaust on-off valve 31C unless the radiation dose detected by the radiation detection unit 31E is within a range that does not affect the public exposure. By outputting the close signal, the state returns to the state shown in FIG. 3 and the gas emission is stopped.

  By the way, in the operation | movement mentioned above, when stopping sending of the gas to the 1st storage tank 11B, it is the storage container 100 that the pressure inside the storage container 100 and the pressure inside the 1st storage tank 11B equalized. It is assumed that the total amount of the generated radioactive noble gas is sent to the first storage tank 11B and stored. A configuration for this will be described.

  FIG. 10 is an explanatory diagram for setting the capacity of the first storage unit in the storage container maintenance facility according to the present embodiment. FIG. 11 is a graph for setting the capacity of the first storage unit in the containment vessel maintenance facility according to the present embodiment.

  Radioactive noble gases xenon and krypton are generated by fission of fuel uranium, and the entire amount of radioactive noble gas is released within a relatively short time after fuel damage. The radioactive noble gas is considered to be completely mixed with the air inside the containment vessel 100 and the vapor generated inside the containment vessel 100, and non-condensable gases such as air and radioactive noble gas are accompanied by the vapor that continues to be generated. Is stored in the first storage tank 11B. When the non-condensable gas of the entire capacity of the storage container 100 is stored in the first storage tank 11B, the radioactive noble gas dispersed in the non-condensable gas is also stored in the first storage tank 11B. The capacity of the first storage tank 11B is designed as follows.

  The 1st storage tank 11B is designed by the capacity | capacitance required to store the non-condensable gas of the full capacity of the storage container 100. FIG. The volume of the non-condensable gas stored in the first storage tank 11B is compressed by the pressure inside the storage container 100, and this volume is the temperature (room temperature), pressure (atmospheric pressure), volume (storage container 100) before the accident. And the volume after the accident (saturated steam temperature), pressure (design value pressure of the containment vessel 100), volume (volume of the first storage tank 11B), and Boyle-Charles' law ( The requirement is satisfied from PV / T = constant). Specifically, since the capacity of the storage container 100 is a constant, the necessary capacity of the first storage tank 11B can be obtained by setting the pressure (design value pressure) inside the storage container 100 after the accident.

In the containment vessel maintenance facility of the present embodiment, as shown in FIG. 10, in the reactor steady operation before the accident, the containment vessel 100 has an internal pressure P ₀ of 0.1013 MPa (a) equivalent to atmospheric pressure, and a capacity V ₀ is V ₀ m ³ (depending on the nuclear facility), and the internal temperature T ₀ is T ₀ ° C. In this case, the first storage tank 11B, the internal pressure _{P 1} is atmospheric equivalent 0.1013 MPa (a), volume _{V 1} is _V 1 ^{m 3,} the temperature _{T 1} of the inner and _{T 1} ° C.. After the severe accident, the containment vessel 100 uses the internal pressure P ′ ₀ as the design value, P ′ ₀ MPa (a), the capacity V ′ ₀ remains unchanged, V ₀ m ³ , and the internal temperature T ′ _0. Is T ′ ₀ ° C. In this case, in the first storage tank 11B, the internal pressure P ′ ₁ is P ′ ₁ MPa (a), the capacity V ′ ₁ is not changed, V ₁ m ³ , and the internal temperature T ′ ₁ is T ′ ₁ ° C. .

  From this, before and after the accident, the following equation (1) is established according to Boyle-Charles' law.

(P ₀ · V ₀ / T ₀ ) + (P ₁ · V ₁ / T ₁ ) = P ′ ₁ · V ′ ₁ / T ′ ₁ (1)

  The left type of the equation (1) represents PV / T of the storage container 100 and the first storage tank 11B before the accident, and the right type represents the non-condensable gas inside the storage container 100 after the accident in the first storage tank 11B. PV / T after movement is represented. In addition, as a capacity | capacitance of the 1st storage tank 11B, it is necessary to add the amount of condensed water stored besides non-condensable gas, and the amount of water required for water circulation.

In the equation (1), when P ₀ = P ₁ , T ₀ = T ₁ , and V ₁ = V ′ ₁ are substituted, the equation (2) is obtained.

V ₁ = P ₀ · V ₀ · T ′ ₁ / (P ′ ₁ · T ₀ −P ₀ · T ′ ₁ ) (2)

Substituting the above-mentioned numerical value into the equation (2), V ₁ = 0.1013 × V ₀ × (273 + T ′ ₁ ) / (P ′ ₁ × (273 + T ₀ ) −0.1013 × (273 + T ′ ₁ )) As the capacity V ₁ of the first storage tank 11B, the capacity V ₀ of the storage container 100 is substituted, and an initial internal temperature T ₀ and a temperature T ′ ₁ after storage are set, thereby the first storage tank 11B after the accident. determined by the pressure P _'1. When the relationship between the pressure P ′ ₁ and the capacity V ₁ of the first storage tank 11B is designed as shown in FIG. 11, the required capacity V ₁ corresponding to the pressure P ′ ₁ of the first storage tank 11B can be obtained. By this design the capacity V ₁ of the first storage tank 11B, to stop the feeding of the gas into the first storage tank 11B, the pressure and the pressure inside the first storage tank 11B of the storage container 100 It can be considered that the total amount of the non-condensable gas generated in the storage container 100 is sent to the first storage tank 11B and stored.

The first storage tank 11B may be provided with _one of the capacity V ₁ obtained as described above, but the capacity V ₁ may be divided into a plurality of parts and connected in parallel. . The supply of gas from the storage container 100 to the plurality of first storage tanks 11B may be performed simultaneously to the plurality of first storage tanks 11B, or may be sequentially performed to each of the first storage tanks 11B.

  As described above, the containment vessel maintenance facility of the present embodiment is a filter that removes radioactive iodine and particulate radioactive substances from the gas inside the containment vessel 100 that stores the reactor pressure vessel 101 containing the core in an airtight state. A unit 2; an exhaust pipe 3 connected to the filter unit 2 and drawn out of the storage container 100; and a first reservoir 11 connected to the end of the exhaust pipe 3 outside the storage container 100; The second reservoir 21 connected to the end of the exhaust pipe 3 outside the storage container 100 in parallel with the first reservoir 11 and the destination of the gas that has passed through the filter unit 2 are the first reservoir 11 or the second reservoir The switching part (the 1st storage on-off valve 11C and the 2nd storage on-off valve 21C) which switches to the 2 storage part 21, the 1st cooling part 12 which condenses the vapor | steam in the gas supplied to the 1st storage part 11, and the 2nd Reservoir Having a second cooling unit 22 for condensing the steam in the feed gas to the 1, a.

  According to this containment vessel maintenance facility, the gas from which radioactive iodine and particulate radioactive substances have been removed by the filter unit 2 is sent out from the containment vessel 100 through the exhaust pipe 3 and is sent to the switching unit (first storage on-off valve). 11C and the second storage opening / closing valve 21C) and sent to the first storage unit 11 or the second storage unit 21. When the gas is first sent to the first storage unit 11, the first storage unit 11 stores the non-condensable gas containing the radioactive noble gas, and the first cooling unit 12 condenses the vapor that is the condensable gas. Is done. For this reason, the pressure inside the containment vessel 100 raised by the accident can be reduced while the radioactive noble gas generated inside the containment vessel 100 due to the accident is contained in the first storage unit 11. Thereafter, the gas sent to the second storage unit 21 is air that is a non-condensable gas and steam that is a condensable gas. In the second storage unit 21, the non-condensable gas is stored and the second cooling unit. The steam is condensed by 22. For this reason, the pressure inside the storage container 100 can be reduced. As a result, the radioactive noble gas inside the storage container 100 can be contained separately from the storage container 100, and the pressure inside the storage container 100 can be reduced. Moreover, according to the containment vessel maintenance facility, the first reservoir 11 (first reservoir tank 11B) is provided separately from the containment vessel 100 by the exhaust pipe 3, so that radioactive noble gas is stored in the decommissioning operation. The 1st storage part 11 currently made does not become the cause which obstructs the dismantling of the storage container 100. FIG.

  Further, in the storage container maintenance facility of the present embodiment, the first condensed water delivery unit 13 that sends the condensed water of the first storage unit 11 condensed by the first cooling unit 12 to the storage container 100, and the first storage unit 11 A first reservoir water level detector 14 that detects the level of condensed water, a second condensed water delivery unit 23 that sends the condensed water in the second reservoir 21 condensed by the second cooling unit 22 to the storage container 100, and It is preferable to have the 2nd storage part water level detection part 24 which detects the water level of the condensed water in the 2 storage part 21. FIG.

  According to this containment vessel maintenance facility, the water level of the condensed water in the first reservoir 11 can be managed by the first reservoir water level detector 14, and the capacity for storing the non-condensable gas in the first reservoir 11 can be increased. Can be secured. Moreover, the condensed water of the 1st storage part 11 can be supplied as the cooling water inside the storage container 100 by the 1st condensed water delivery part 13, and the temperature and pressure of the storage container 100 can be reduced. Since the radioactive noble gas stored in the first storage unit 11 is a non-condensable gas and is not included in the condensed water, a situation in which the radioactive noble gas is returned to the storage container 100 can be prevented. On the other hand, the water level of the condensed water in the second reservoir 21 can be managed by the second reservoir water level detector 24, and the capacity for storing the non-condensable gas in the second reservoir 21 can be ensured. Moreover, the condensed water of the 2nd storage part 21 can be supplied as the cooling water inside the storage container 100 by the 2nd condensed water delivery part 23, and the temperature and pressure of the storage container 100 can be reduced.

  In the containment vessel maintenance facility of the present embodiment, the branch exhaust pipe 31A connected to the first storage unit 11, the branch exhaust on-off valve 31C provided in the branch exhaust pipe 31A, and the branch exhaust pipe 31A are provided. It is preferable to include a radiation detection unit 31E and an exhaust cylinder 31B provided at the end of the branch exhaust pipe 31A.

  According to this containment vessel maintenance facility, after the radioactive noble gas stored in the first storage unit 11 is attenuated by long-term storage, the branch exhaust opening / closing valve 31C is opened while monitoring the radiation dose by the radiation detection unit 31E. Then, it can be managed and released from the exhaust cylinder 31B through the branch exhaust pipe 31A.

Further, in the containment vessel maintenance facility of the present embodiment, the relationship P ₀ between the pressure P ₀ before the accident inside the containment vessel 100, the capacity V ₀ of the containment vessel 100, and the temperature T ₀ inside the containment vessel 100 before the accident. V ₀ / T ₀ , the pressure P ₁ before the accident inside the first storage unit 11 (first storage tank 11B), the capacity V ₁ of the first storage unit 11 (first storage tank 11B), and the first storage unit 11 (first storage tank 11B) relationship with the temperature T ₁ before the accident P ₁ · V ₁ / T ₁ , and the assumed pressure after the accident inside the first storage unit 11 (first storage tank 11B) P _'1 and the first storage unit 11 (first storage tank 11B) of volume V' ₁ to the first reservoir 11 'relation P between _1' assume the temperature T after internal accident (first reservoir tank 11B) Formula (P ₀ · V ₀ / T ₀ ) + (P ₁ · V ₁ / T ₁ ) = P obtained from ₁ · V ′ ₁ / T ′ ₁ In ' ₁ · V' ₁ / T ' ₁ , P ₀ = P ₁ , T ₀ = T ₁ , V ₁ = V' ₁ is substituted, and the first storage unit 11 (first storage tank corresponding to P ' ₁ is assigned. it is preferable to set the volume _{V 1} of the 11B).

According to this containment vessel maintenance facility, the entire amount of non-condensable gas inside the containment vessel 100 can be sent to the first reservoir 11 (first reservoir tank 11B) from the relationship of pressure × volume / temperature = constant. setting the volume _{V 1} of the first storage unit 11 (first storage tank 11B) as. By doing in this way, when the pressure inside the storage container 100 and the pressure inside the 1st storage part 11 (1st storage tank 11B) are equalized, the non-condensable gas inside the storage container 100 is obtained. The total amount (including radioactive noble gas) may be sent to the first storage unit 11 (first storage tank 11B). Thus, since the gas inside the storage container 100 is sent to the first storage unit 11 (first storage tank 11B) due to a pressure difference, it is not necessary to use a machine such as a pump.

  Further, the containment vessel maintenance method of the present embodiment is a filter unit 2 that removes radioactive iodine and particulate radioactive substances from the gas inside the containment vessel 100 that stores the reactor pressure vessel 101 containing the core in an airtight state. An exhaust pipe 3 connected to the filter unit 2 and drawn out of the storage container 100; a first reservoir 11 connected to the end of the exhaust pipe 3 outside the storage container 100; The second reservoir 21 connected to the end of the exhaust pipe 3 outside the storage container 100 in parallel with the one reservoir 11 and the destination of the gas that has passed through the filter unit 2 are the first reservoir 11 or the second reservoir. Switching unit (first storage on-off valve 11C and second storage on-off valve 21C) for switching to unit 21, first cooling unit 12 for condensing vapor in the gas supplied to first storage unit 11, and second storage unit 21 A containment vessel maintenance method using a containment vessel maintenance facility having a second cooling unit 22 for condensing vapor in the supplied gas, wherein the switching unit (the first storage on-off valve 11C and the second storage valve) at the time of an accident After the first step, the first cooling unit 12 condenses the vapor in the gas while storing the gas inside the storage container 100 in the first storage unit 11 by switching the on-off valve 21C). The second cooling unit 22 condenses the vapor in the gas while storing the gas inside the storage container 100 in the second storage unit 21 by switching between the first storage on-off valve 11C and the second storage on-off valve 21C. Two steps.

  According to this containment vessel maintenance method, in the first step, the gas from which radioactive iodine or particulate radioactive material has been removed by the filter unit 2 is sent out from the containment vessel 100 through the exhaust pipe 3 and is sent to the outside. The first storage opening / closing valve 11 </ b> C and the second storage opening / closing valve 21 </ b> C) are switched and sent to the first storage unit 11. In the 1st storage part 11, the vapor | steam which is a condensable gas is condensed by the 1st cooling part 12 while the noncondensable gas containing a radioactive noble gas is stored. For this reason, the pressure inside the containment vessel 100 raised by the accident can be reduced while the radioactive noble gas generated inside the containment vessel 100 due to the accident is contained in the first storage unit 11. Thereafter, in the second step, the gas sent to the second storage unit 21 is air that is a non-condensable gas and steam that is a condensable gas. Steam is condensed by the cooling unit 22. For this reason, the pressure inside the storage container 100 can be reduced. As a result, the radioactive noble gas inside the storage container 100 can be contained separately from the storage container 100, and the pressure inside the storage container 100 can be reduced. In addition, according to this containment vessel maintenance method, since the first storage unit 11 (first storage tank 11B) is provided separately from the containment vessel 100 by the exhaust pipe 3, the radioactive noble gas is stored in the decommissioning operation. The 1st storage part 11 currently made does not become the cause which obstructs the dismantling of the storage container 100. FIG.

  In the containment vessel maintenance method of the present embodiment, the containment vessel maintenance facility includes a first condensed water delivery unit 13 that sends the condensed water of the first storage unit 11 condensed by the first cooling unit 12 to the containment vessel 100; The first condensate water level detection unit 14 that detects the water level of the condensate water in the first storage unit 11 and the second condensate water that sends the condensate in the second storage unit 21 condensed by the second cooling unit 22 to the storage container 100. It has a delivery part 23 and a second storage part water level detection part 24 for detecting the level of condensed water in the second storage part 21. In the first step, the water level of the first storage part water level detection part 14 is detected. Based on the detection, the condensed water in the first reservoir 11 is sent to the storage container 100 by the first condensed water delivery unit 13, and in the second step, the second condensation is performed based on the detection of the water level by the second reservoir water level detector 24. The condensed water in the second reservoir 21 is stored by the water delivery part 23. It is preferable to send the container 100.

  According to this containment vessel maintenance method, the water level of the condensed water in the first reservoir 11 can be managed by the first reservoir water level detector 14 in the first step, and the non-condensable gas in the first reservoir 11. It is possible to secure a capacity for storing the water. In the first step, the condensed water in the first storage unit 11 can be supplied as cooling water inside the storage container 100 by the first condensed water delivery unit 13, and the temperature and pressure of the storage container 100 can be reduced. Can do. Since the radioactive noble gas stored in the first storage unit 11 is a non-condensable gas and is not included in the condensed water, a situation in which the radioactive noble gas is returned to the storage container 100 can be prevented. On the other hand, in the second step, the water level of the condensed water in the second reservoir 21 can be managed by the second reservoir water level detector 24, and the capacity for storing the noncondensable gas in the second reservoir 21 is ensured. be able to. Further, in the second step, the condensed water in the second reservoir 21 can be supplied as cooling water inside the storage container 100 by the second condensed water delivery part 23, and the temperature and pressure of the storage container 100 can be reduced. Can do.

  Further, in the containment vessel maintenance method of the present embodiment, the containment vessel maintenance facility includes a branch exhaust pipe 31A connected to the first storage unit 11, a branch exhaust on-off valve 31C provided in the branch exhaust pipe 31A, and a branch exhaust. It has a radiation detector 31E provided in the pipe 31A and an exhaust cylinder 31B provided at the end of the branch exhaust pipe 31A. After the first step and the second step, the first period has passed. When the radioactive noble gas stored in the storage unit 11 is attenuated, the branch exhaust on-off valve 31C is opened and the radiation detection unit 31E detects the radiation dose, and the first storage unit is connected to the first storage unit through the branch exhaust pipe 31A. It is preferable to include a third step of exhausting the gas stored in 11.

  According to this containment container maintenance method, after the radioactive noble gas stored in the first storage unit 11 is attenuated by long-term storage, the branch exhaust opening / closing valve 31C is opened while monitoring the radiation dose by the radiation detection unit 31E. Then, it can be managed and released from the exhaust cylinder 31B through the branch exhaust pipe 31A.

Further, in the containment vessel maintenance method of the present embodiment, the containment vessel maintenance facility includes the pressure P ₀ before the accident inside the containment vessel 100, the capacity V ₀ of the containment vessel 100, and the temperature T before the accident inside the containment vessel 100. ₀ relationship P ₀ · V ₀ / T ₀ , pressure P ₁ before the accident inside the first reservoir 11 (first reservoir tank 11B) and capacity V of the first reservoir 11 (first reservoir tank 11B) ₁ and the relationship P ₁ · V ₁ / T ₁ between the temperature T ₁ before the accident inside the first storage unit 11 (first storage tank 11B), and the inside of the first storage unit 11 (first storage tank 11B) Assumed pressure P ′ ₁ after the accident, the capacity V ′ ₁ of the first storage unit 11 (first storage tank 11B), and the assumed temperature T ′ after the accident inside the first storage unit 11 (first storage tank 11B) ₁ and the relationship _{P '1 · V' 1 /} T '1 from the resulting equation _{(P 0 · V 0 / T} 0) + (P 1 'In _{1, P 0 = P 1,} T 0 = T 1, V 1 = V' V 1 / T 1) = P '1 · V' 1 / T first corresponding to ₁ by substituting the P _'1 reservoir 11 volume V ₁ of the (first reservoir tank 11B) is set and the containment pressure detecting unit 1 for detecting the pressure inside the containment vessel 100, the first storage section 11 (first storage tank 11B) A first reservoir pressure detector 15 that detects the internal pressure of the first reservoir, and in the first step, the pressure detected by the containment vessel pressure detector 1 and the first reservoir pressure detector 15 detect When the pressure to be equalized, it is preferable to switch to the second step by the switching unit (first storage on-off valve 11C and second storage on-off valve 21C).

According to this containment vessel maintenance method, the total amount of non-condensable gas inside the containment vessel 100 can be sent to the first reservoir 11 (first reservoir tank 11B) from the relationship of pressure × volume / temperature = constant. setting the volume _{V 1} of the first storage unit 11 (first storage tank 11B) as. For this reason, in the first step, when the pressure inside the storage container 100 and the pressure inside the first storage part 11 (first storage tank 11B) are equalized, the non-condensability inside the storage container 100 is obtained. The total amount of gas (including radioactive noble gas) may be sent to the first storage unit 11 (first storage tank 11B). In addition, since the 2nd storage tank 21B of the 2nd storage part 21 reduces the pressure inside the storage container 100, and the capacity | capacitance which receives the whole quantity of the gas inside the storage container 100 is not required, the 1st storage part 11 ( The capacity is smaller than that of the first storage tank 11B).

DESCRIPTION OF SYMBOLS 1 Containment vessel pressure detection part 2 Filter unit 3 Exhaust piping 3A Exhaust on-off valve 3B Exhaust on-off valve 11 1st storage part 11A 1st storage piping 11B 1st storage tank 11C 1st storage on-off valve 12 1st cooling part 12A Circulation piping 12B Heat exchanger 12C Cooling pump 12D Sprinkler 12E First cooling on-off valve 12F First cooling on-off valve 13 First condensate delivery part 13A Delivery pipe 13B Delivery pump 13C Delivery on-off valve 13D Delivery on-off valve 13E Check valve 14 First storage Water level detector 15 First reservoir pressure detector 21 Second reservoir 21A Second reservoir piping 21B Second reservoir tank 21C Second reservoir on-off valve 22 Second cooling portion 22A Circulation piping 22Aa Cooling piping 22Ab Cooling piping 22B Heat exchange 22C Cooling pump 22D Sprinkler 22E Second cooling on-off valve 22F Second cooling on-off valve 2 Second condensate delivery part 23A Delivery pipe 23Aa Connection delivery pipe 23B Delivery pump 23C Delivery on / off valve 23D Delivery on / off valve 23E Check valve 24 Second reservoir water level detector 25 Second reservoir pressure detector 31 Exhaust part 31A Branch exhaust Piping 31B Exhaust cylinder 31C Branch exhaust open / close valve 31D Throttle valve 31E Radiation detection unit 41 Control unit 100 Containment vessel 101 Reactor pressure vessel

Claims (8)

A filter unit that removes radioactive iodine and particulate radioactive material from the gas inside the containment vessel that stores the reactor pressure vessel containing the core in an airtight state; and
An exhaust pipe connected to the filter unit and drawn out of the containment vessel; and
A first reservoir connected to an end of the exhaust pipe outside the containment vessel;
A second reservoir connected to the end of the exhaust pipe outside the containment vessel in parallel with the first reservoir;
A switching unit that switches the destination of the gas that has passed through the filter unit to the first storage unit or the second storage unit;
A first cooling section for condensing vapor in the gas supplied to the first storage section;
A second cooling unit for condensing vapor in the gas supplied to the second storage unit;
Containment vessel maintenance equipment. A first condensed water delivery unit that sends the condensed water of the first storage unit condensed by the first cooling unit to the containment vessel;
A first reservoir water level detector for detecting the level of condensed water in the first reservoir;
A second condensed water delivery section for sending the condensed water of the second storage section condensed by the second cooling section to the containment vessel;
A second reservoir water level detector for detecting the level of condensed water in the second reservoir,
The containment vessel maintenance facility according to claim 1, comprising: A branch exhaust pipe connected to the first reservoir;
A branch exhaust on-off valve provided in the branch exhaust pipe;
A radiation detector provided in the branch exhaust pipe;
An exhaust pipe provided at the end of the branch exhaust pipe;
The containment vessel maintenance facility according to claim 1 or 2, comprising: The relationship P ₀ · V ₀ / T ₀ between the pressure P ₀ before the accident inside the containment vessel, the capacity V ₀ of the containment vessel, and the temperature T ₀ inside the containment vessel before the accident, the first reservoir The relation P ₁ · V ₁ / T ₁ between the pressure P ₁ before the accident inside the cylinder, the capacity V ₁ of the first storage section, and the temperature T ₁ before the accident inside the first storage section, and the first Relationship P ′ ₁ · V ′ between the assumed pressure P ′ ₁ after the accident inside the storage part, the capacity V ′ ₁ of the first storage part, and the assumed temperature T ′ ₁ after the accident inside the first storage part ₁ / T ′ ₁ (P ₀ · V ₀ / T ₀ ) + (P ₁ · V ₁ / T ₁ ) = P ′ ₁ · V ′ ₁ / T ′ ₁ , P ₀ = P ₁ , 'by substituting _{1 P' T 0 = T 1} , V 1 = V set the _{V 1} corresponding to _1, containment integrity Installation according to any one of claims 1 to 3. A filter unit that removes radioactive iodine and particulate radioactive material from the gas inside the containment vessel that stores the reactor pressure vessel containing the core in an airtight state; and
An exhaust pipe connected to the filter unit and drawn out of the containment vessel; and
A first reservoir connected to an end of the exhaust pipe outside the containment vessel;
A second reservoir connected to the end of the exhaust pipe outside the containment vessel in parallel with the first reservoir;
A switching unit that switches the destination of the gas that has passed through the filter unit to the first storage unit or the second storage unit;
A first cooling section for condensing vapor in the gas supplied to the first storage section;
A second cooling unit for condensing vapor in the gas supplied to the second storage unit;
A containment vessel maintenance method using a containment vessel maintenance facility comprising:
A first step of condensing vapor in the gas by the first cooling unit while storing the gas inside the storage container in the first storage unit by switching the switching unit at the time of an accident;
Next to the first step, the second step of condensing the vapor in the gas by the second cooling unit while storing the gas inside the storage container in the second storage unit by switching the switching unit,
Containment container maintenance method. The containment vessel maintenance facility is
A first condensed water delivery unit that sends the condensed water of the first storage unit condensed by the first cooling unit to the containment vessel;
A first reservoir water level detector for detecting the level of condensed water in the first reservoir;
A second condensed water delivery section for sending the condensed water of the second storage section condensed by the second cooling section to the containment vessel;
A second reservoir water level detector for detecting the level of condensed water in the second reservoir,
Have
In the first step, the condensed water in the first reservoir is sent to the storage container by the first condensed water delivery unit based on the detection of the water level by the first reservoir water level detector, in the second step, The containment vessel maintenance method according to claim 5, wherein condensate water in the second reservoir is sent to the containment vessel by the second condensed water delivery unit based on detection of a water level by the second reservoir water level detector. The containment vessel maintenance facility is
A branch exhaust pipe connected to the first reservoir;
A branch exhaust on-off valve provided in the branch exhaust pipe;
A radiation detector provided in the branch exhaust pipe;
An exhaust pipe provided at the end of the branch exhaust pipe;
Have
After the first step and the second step, when the radioactive noble gas stored in the first storage unit is attenuated after a predetermined period of time, the branch exhaust opening / closing valve is opened and the radiation detection unit The containment vessel maintenance method according to claim 5 or 6, comprising a third step of exhausting the gas stored in the first storage part from the exhaust pipe through the branch exhaust pipe while detecting a radiation dose. The containment vessel maintenance facility is
The relationship P ₀ · V ₀ / T ₀ between the pressure P ₀ before the accident inside the containment vessel, the capacity V ₀ of the containment vessel, and the temperature T ₀ inside the containment vessel before the accident, the first reservoir The relation P ₁ · V ₁ / T ₁ between the pressure P ₁ before the accident inside the cylinder, the capacity V ₁ of the first storage section, and the temperature T ₁ before the accident inside the first storage section, and the first Relationship P ′ ₁ · V ′ between the assumed pressure P ′ ₁ after the accident inside the storage part, the capacity V ′ ₁ of the first storage part, and the assumed temperature T ′ ₁ after the accident inside the first storage part ₁ / T ′ ₁ (P ₀ · V ₀ / T ₀ ) + (P ₁ · V ₁ / T ₁ ) = P ′ ₁ · V ′ ₁ / T ′ ₁ , P ₀ = P ₁ , _{T 0 = T 1, V 1} = V V 1 corresponding to the _{1 '1} P by substituting' is set,
And a containment vessel pressure detector for detecting the pressure inside the containment vessel,
A first reservoir pressure detector that detects the pressure inside the first reservoir;
Have
In the first step, when the pressure detected by the containment vessel pressure detection unit and the pressure detected by the first storage unit pressure detection unit are equalized, the switching unit switches to the second step. The containment vessel maintenance method according to any one of 5 to 7.

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