JP2018169252A - 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 dismantle the facility sooner than when the radioactive noble gas is reduced.SOLUTION: The present invention includes: a filter unit 2 for removing radioactive substances from the gas in a 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 first cooling unit 12 for condensing the vapor in the gas supplied into the first storage unit 11; and an adsorption unit 41 connected to the first storage unit 11 independently, the adsorption unit introducing the gas stored in the first storage unit 11 and adsorbing the radioactive noble gas in the gas.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.

  For example, Patent Document 3 discloses a method for filtering harmful exhaust gas from a nuclear power plant. The method includes the steps of supplying an exhaust gas including a mixture of a plurality of gases at a nuclear power plant in order to produce a treated exhaust gas in a method of filtering harmful exhaust gases of a nuclear power plant. Filtering the components of the exhaust gas by membrane separation by at least one of sieving, adsorption and diffusion through one membrane, storing the filtered components in a reservoir, and after processing Releasing the exhaust gas into the atmosphere.

Japanese Patent No. 5238649 JP-T-2006-521843 Special table 2015-50850502 gazette

  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.

  In the invention of Patent Document 3, the component obtained by filtering the exhaust gas component is stored in a reservoir. However, if the component is a radioactive noble gas, the radioactive noble gas must be attenuated, and the reservoir can be used for a long period of time. It cannot be dismantled.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and contains the containment vessel in which the radioactive noble gas in the containment vessel is sealed separately from the containment vessel, and the dismantling of the facility can be carried out earlier than the radioactive noble gas decays. An object is to provide a facility and a containment container maintenance method.

  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 rare gas connected to an end of the exhaust pipe outside the containment vessel A storage unit, a cooling unit for condensing vapor in the gas supplied to the rare gas storage unit, and a gas stored in the rare gas storage unit that is independently connected to the rare gas storage unit. And an adsorbing part for adsorbing a radioactive noble gas in the gas.

  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 the noble gas reservoir contains the radioactive noble gas. The non-condensable gas is stored and the condensable gas vapor is condensed by the cooling unit. For this reason, the pressure inside the containment vessel that has risen due to the accident can be reduced while confining radioactive noble gas generated inside the containment vessel due to the accident in the noble gas storage unit. And the radioactive noble gas stored in the noble gas storage part is introduce | transduced into an adsorption | suction part, and is adsorb | sucked. For this reason, it can replace with a noble gas storage part and can contain radioactive noble gas in an adsorption | suction part. As a result, the radioactive noble gas inside the containment vessel can be contained separately from the containment vessel, and the equipment such as the containment vessel and the noble gas storage unit can be disassembled earlier than the radioactive noble gas decays.

  In the containment vessel maintenance facility according to one aspect of the present invention, it is preferable to have a dehumidifying unit that is provided between the rare gas storage unit and the adsorption unit and removes moisture in the gas.

  According to this containment vessel maintenance facility, the radioactive noble gas is difficult to be adsorbed when it contains moisture. Therefore, the adsorption efficiency of the radioactive noble gas in the adsorption section can be improved by removing the moisture in the gas. For this reason, radioactive noble gas can be isolate | separated from air and the non-condensable gas containing the radioactive noble gas currently stored by the noble gas storage part can be reduced significantly.

  Further, in the containment vessel maintenance facility according to one aspect of the present invention, the gas stored in the rare gas storage unit by being pressurized by a pressure difference between the rare gas storage unit and the adsorption unit may be sent to the adsorption unit. preferable.

  The adsorption efficiency of the radioactive noble gas in the adsorption section is improved as the pressure of the gas to be sent is higher. According to this containment vessel maintenance facility, the adsorption efficiency of radioactive noble gas in the adsorption unit can be improved by pressurizing the gas stored in the rare gas storage unit with a pressure difference and sending it to the adsorption unit. For this reason, radioactive noble gas can be isolate | separated from air and the non-condensable gas containing the radioactive noble gas currently stored by the noble gas storage part can be reduced significantly.

  Further, in the containment vessel maintenance facility according to one aspect of the present invention, a pressurization unit that pressurizes the gas stored in the rare gas storage unit, and a rare gas storage unit pressure that detects a pressure inside the rare gas storage unit And a detection unit.

  The adsorption efficiency of the radioactive noble gas in the adsorption section is improved as the pressure of the gas to be sent is higher. According to this containment vessel maintenance facility, when the internal pressure of the rare gas reservoir is detected by the rare gas reservoir pressure detector, and the internal pressure of the rare gas reservoir decreases, the pressurizer compresses the rare gas reservoir. The gas stored in can be pressurized. For this reason, the adsorption efficiency of the radioactive noble gas in an adsorption | suction part can be improved by pressurizing the gas stored in the noble gas storage part and sending it to an adsorption | suction part. As a result, the radioactive noble gas can be separated from the air, and the volume of the non-condensable gas containing the radioactive noble gas stored in the noble gas storage unit can be greatly reduced.

  In the containment vessel maintenance facility according to one aspect of the present invention, the adsorption unit discharges the gas after the radioactive rare gas is adsorbed, and the introduction unit that introduces the gas stored in the rare gas storage unit. It is preferable to include a discharge unit, an introduction on-off valve that opens and closes the introduction unit, a discharge on-off valve that opens and closes the discharge unit, and an adsorption radiation detection unit provided in the discharge unit.

  According to this containment vessel maintenance facility, when the radiation amount in the gas discharged from the discharge unit by the detection of the adsorption radiation detection unit exceeds a predetermined value, it is determined that the adsorption of the radioactive rare gas in the adsorption unit is saturated. Can do. For this reason, the introduction of the gas into the adsorption unit can be stopped or switched to the introduction of the gas into another adsorption unit.

  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 rare gas connected to an end of the exhaust pipe outside the containment vessel A storage unit, a cooling unit for condensing vapor in the gas supplied to the rare gas storage unit, and a gas stored in the rare gas storage unit that is independently connected to the rare gas storage unit. A containment vessel maintenance facility having an adsorption part for adsorbing a radioactive noble gas in the gas, and storing the gas inside the containment vessel in the rare gas storage part at the time of an accident Shi One includes a storing step for condensing the vapor in the gas by the cooling unit, to the next of said storing step, and a suction step of sending the gas stored in the rare gas reservoir to the suction unit.

  According to this containment vessel maintenance method, 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 in the storage process, A non-condensable gas containing a rare gas is stored, and vapor that is a condensable gas is condensed by the cooling unit. For this reason, the pressure inside the containment vessel that has risen due to the accident can be reduced while confining radioactive noble gas generated inside the containment vessel due to the accident in the noble gas storage unit. Moreover, in the adsorption step, the radioactive noble gas stored in the noble gas storage unit is introduced into the adsorption unit and adsorbed. For this reason, it can replace with a noble gas storage part and can contain radioactive noble gas in an adsorption | suction part. As a result, the radioactive noble gas inside the containment vessel can be contained separately from the containment vessel, and the equipment such as the containment vessel and the noble gas storage unit can be disassembled earlier than the radioactive noble gas decays.

  Further, in the containment vessel maintenance method according to one aspect of the present invention, the containment vessel maintenance facility includes a dehumidifying unit that is provided between the rare gas storage unit and the adsorption unit and removes moisture in the gas. It is preferable to include a dehumidification step of removing moisture in the gas sent to the adsorption unit by the dehumidification unit before the adsorption step.

  According to this containment container maintenance method, since radioactive noble gas is difficult to be adsorbed when it contains moisture, the adsorption efficiency of radioactive noble gas in the adsorption process can be improved by removing the moisture in the gas by the dehumidification process before the adsorption process. Can be improved. For this reason, radioactive noble gas can be isolate | separated from air and the non-condensable gas containing the radioactive noble gas currently stored by the noble gas storage part can be reduced significantly.

  Further, in the containment vessel maintenance method according to one aspect of the present invention, the containment vessel maintenance facility includes a pressurizing unit that pressurizes the gas stored in the rare gas storage unit, and a pressure inside the rare gas storage unit. A rare gas reservoir pressure detection unit that detects pressure, and pressurizes the gas stored in the rare gas reservoir by feeding a pressure difference between the rare gas reservoir and the adsorption unit to the adsorption unit. When the pressure detected by the rare gas reservoir pressure detector is lower than a predetermined value, it is preferable to pressurize the gas stored in the rare gas reservoir by the pressurizer.

  The adsorption efficiency of the radioactive noble gas in the adsorption section is improved as the pressure of the gas to be sent is higher. According to this containment vessel maintenance method, when the internal pressure of the rare gas reservoir is detected by the rare gas reservoir pressure detector, and the pressure inside the rare gas reservoir is reduced, the pressurizer compresses the rare gas reservoir. The gas stored in can be pressurized. For this reason, the adsorption efficiency of the radioactive noble gas in an adsorption | suction part can be improved by pressurizing the gas stored in the noble gas storage part and sending it to an adsorption | suction part. As a result, the radioactive noble gas can be separated from the air, and the volume of the non-condensable gas containing the radioactive noble gas stored in the noble gas storage unit can be greatly reduced.

  Further, in the containment vessel maintenance method according to one aspect of the present invention, the adsorption unit of the containment vessel maintenance facility has an introduction unit that introduces gas stored in the noble gas storage unit, and a radioactive noble gas is adsorbed. A discharge section for discharging the subsequent gas, an introduction opening / closing valve for opening / closing the introduction section, a discharge opening / closing valve for opening / closing the discharge section, and an adsorption radiation detection section provided in the discharge section, When the amount of radiation in the gas discharged from the discharge unit exceeds a predetermined value as detected by the adsorption radiation detection unit, it is preferable to close the introduction open / close valve and the discharge open / close valve.

  According to this containment container maintenance method, when the radiation dose in the gas discharged from the discharge unit by the detection of the adsorption radiation detection unit exceeds a predetermined value, it is determined that the adsorption of the radioactive rare gas in the adsorption unit is saturated. Can do. For this reason, the introduction of the gas into the adsorption unit can be stopped or switched to the introduction of the gas into another adsorption unit.

  According to the present invention, the radioactive noble gas in the containment vessel is contained separately from the containment vessel, and the dismantling of the facility can be performed earlier than the radioactive noble gas decays.

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 operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 11 is an operation diagram of the containment container maintenance facility according to the embodiment of the present invention. FIG. 12 is an explanatory diagram for setting the capacity of the first storage unit in the storage container maintenance facility according to the embodiment of the present invention. FIG. 13 is a graph for setting the capacity of the first reservoir in the containment container 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 (cooling unit) 12, Condensate delivery unit 13, first reservoir water level detector 14, first reservoir pressure detector (rare gas reservoir pressure detector) 15, second reservoir (condensate reservoir) 21, and second The cooling unit 22, the second condensed water delivery unit 23, the second storage unit water level detection unit 24, the second storage unit pressure detection unit 25, the exhaust unit 31, the adsorption unit 41, and the dehumidification unit 51 Have.

  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 (rare gas storage tank) 11B, and a first storage opening / closing 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 (condensate 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 an exhaust 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 exhaust 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 exhaust radiation detector 31E is provided in the branch exhaust pipe 31A between the exhaust cylinder 31B and the branch exhaust on / off valve 31C.

  The adsorption unit 41 includes an adsorption pipe 41A, an adsorption tower 41B, an adsorption on-off valve 41C, an introduction on-off valve 41D, a discharge on-off valve 41E, an adsorption radiation detection unit 41F, a compressor (pressurization unit) 41G, And a gas reservoir pressure detector 41H.

  One end of the adsorption pipe 41A is connected to the upper part (above the detected water level of the condensed water) of the first storage tank 11B in the first storage part 11, and the other end is provided open to the atmosphere. In the present embodiment, the suction pipe 41A is formed as a branch suction pipe 41Aa, 41Ab, 41Ac, 41Ad whose other end is branched in parallel (four in the present embodiment). Note that the other end of the adsorption pipe 41A does not have to be branched into a plurality.

  The adsorption tower 41B is provided on the other end side of the adsorption pipe 41A. The casing is formed with a casing having an inlet 41Ba at one end and an outlet 41Bb at the other end, and the casing is filled with an adsorbent (activated carbon). In the adsorption tower 41B, the inlet 41Ba is connected toward the first storage tank 11B side at the other end side of the adsorption pipe 41A, and the outlet 41Bb is connected toward the side opened to the atmosphere. Further, the adsorption tower 41B is provided in each of the branched adsorption pipes 41Aa, 41Ab, 41Ac, 41Ad in a configuration in which the other end side of the adsorption pipe 41A is branched into a plurality. Here, the immediate vicinity of the adsorption pipe 41A to which the inlet 41Ba and the inlet 41Ba of the adsorption tower 41B are connected is referred to as an introduction part, and the outlet 41Bb and the adsorption pipe 41A to which the outlet 41Bb of the adsorption tower 41B is connected. The nearest part is called the discharge part.

  The adsorption open / close valve 41C is provided on one end side of the adsorption pipe 41A, opens one end side of the adsorption pipe 41A by an opening operation, and closes one end side of the adsorption pipe 41A by a closing operation. Further, the adsorption on-off valve 41C is an automatic valve, and opens when an open signal is input, and closes when an close signal is input. Further, the adsorption on-off valve 41C may not be an automatic valve.

  The introduction opening / closing valve 41D is provided at the other end side of the adsorption tower 41B and at the introduction portion in each branch adsorption pipe 41Aa, 41Ab, 41Ac, 41Ad, opens the introduction portion by opening operation, and closes the introduction portion by closing operation. To do. The introduction opening / closing valve 41D is an automatic valve, and opens when an open signal is input, and closes when an close signal is input. Further, the introduction opening / closing valve 41D may not be an automatic valve.

  The discharge opening / closing valve 41E is provided at the other end side of the adsorption tower 41B and at the discharge portion of each branch adsorption pipe 41Aa, 41Ab, 41Ac, 41Ad, opens the discharge portion by opening operation, and closes the discharge portion by closing operation. To do. The discharge opening / closing valve 41E is an automatic valve, and opens when an open signal is input, and closes when a close signal is input. Further, the discharge on-off valve 41E may not be an automatic valve.

  Accordingly, all of the adsorption on / off valve 41C, the introduction on / off valve 41D, and the discharge on / off valve 41E are opened, whereby the first storage tank 11B is opened to the atmosphere via the adsorption pipe 41A and the adsorption tower 41B. In addition, the first storage tank 11B is shut off from the atmosphere by closing any one of the adsorption on-off valve 41C, the introduction on-off valve 41D, or the discharge on-off valve 41E. In addition, the adsorption tower 41B is shut off from the atmosphere by closing both the introduction opening / closing valve 41D and the discharge opening / closing valve 41E.

  The adsorption radiation detection unit 41F is provided on the other end side of the adsorption pipe 41A and in the discharge part of each branch adsorption pipe 41Aa, 41Ab, 41Ac, 41Ad, and detects the radiation dose of the fluid passing through the discharge part. The adsorption radiation detection unit 41F is provided between the adsorption tower 41B and the discharge on-off valve 41E in each branch adsorption pipe 41Aa, 41Ab, 41Ac, 41Ad.

  The compressor (pressurizing unit) 41G is a compressor or a blower and sends air. The supply side is opened to the atmosphere, and the exhaust side is the upper part of the first storage tank 11B in the first storage unit 11 (detection of condensed water). It is connected above the water level. The compressor 41G has a pressurization on-off valve 41Ga so as to open or close the first storage tank 11B with respect to the atmosphere. The pressurization on-off valve 41Ga is provided on the supply side or the exhaust side (exhaust side in the present embodiment) of the compressor 41G, opens the first storage tank 11B to the atmosphere via the compressor 41G by an opening operation, and performs the closing operation. The first storage tank 11B is closed off from the atmosphere. The provision of the pressurization on-off valve 41Ga on the exhaust side of the compressor 41G is effective from the viewpoint of preventing leakage from the first storage tank 11B to the outside. The pressurization on-off valve 41Ga is an automatic valve, and opens when an open signal is input, and closes when a close signal is input. Further, the pressurization on-off valve 41Ga may not be an automatic valve.

  The rare gas storage unit pressure detection unit 41H detects the pressure inside the first storage tank 11B in the first storage unit 11, and the first storage unit pressure detection unit 15 can be used in combination.

  The dehumidifying part 51 is provided between the first storage tank 11B and the adsorption tower 41B in the adsorption pipe 41A. The dehumidifying part 51 removes moisture in the gas from the first storage tank 11B to the adsorption tower 41B. Specifically, the dehumidifying unit 51 is a refrigerator, and is cooled to a dew point temperature (−30 ° C .: a temperature at which water vapor reaches saturation and condensation starts when air containing water vapor is cooled), thereby reducing gas. Remove moisture in it. Moreover, the dehumidifying part 51 may be a dehumidifying material arranged in a casing through which gas passes.

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

  The storage container maintenance facility having the above-described configuration is controlled by the control unit 61 in an integrated manner. The control unit 61 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 61 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 (rare gas storage unit pressure detection unit 41H), and a second storage. By inputting detection signals from the water level detector 24, the second reservoir pressure detector 25, the exhaust radiation detector 31E, and the adsorption radiation detector 41F, the cooling water supply pumps of the heat exchangers 12B and 22B, One cooling on-off valve 12E, 12F, cooling pump 12C, 22C, exhaust on-off valve 3A, 3B, first storage on-off valve 11C, delivery on-off valve 13C, delivery on-off valve 13D, 23D, delivery pump 13B, 23B, second cooling on-off Valves 22E, 22F, second storage on-off valve 21C, delivery on-off valve 23C, branch exhaust on-off valve 31C, adsorption on-off valve 41C, introduction on-off valve 41D, discharge on-off valve 41E, compressor 41G, pressurization on-off valve 41Ga Dehumidifying unit outputs a signal for driving (for refrigerator) 51.

  Hereinafter, the storage container maintenance method which is the control of the storage container maintenance facility by the control unit 61 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 61 outputs a signal for stopping the cooling water supply pump, 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, at the time of a severe accident, the controller 61 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 61 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. Further, the control unit 61 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 reaches the design limit pressure, the control unit 61 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 61 sends out the opening / closing valve of the first condensed water delivery unit 13. An open signal for opening 13C and 13D is output. Further, the control unit 61 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. Moreover, when the water level of the condensed water stored in the first storage tank 11 </ b> B detected by the first storage unit water level detection unit 14 falls to a predetermined water level, the control unit 61 sends the delivery pump 13 </ b> B 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 61 outputs a closing signal for closing the first storage on-off 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 61 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 61 outputs a stop signal for stopping the cooling pump 12C 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 61 outputs an open 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 61 outputs a drive signal for driving the cooling pump 22C (not necessary because the cooling pump 22C outputs a driving signal to the cooling pump 12C when the cooling pump 22C shares the cooling pump 12C). Further, the control unit 61 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 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 exceeds the predetermined water level, the control unit 61 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 61 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 61 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 61 manages the internal pressure of the second storage tank 21 </ b> B detected by the second storage unit pressure detection unit 25. 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 61 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 longer half-life. For this reason, if krypton is attenuate | damped in the state stored in the 1st storage tank 11B, you have to wait several years for half-life before disassembling the 1st storage part 11 (especially 1st storage tank 11B).

Therefore, in the present embodiment, the gas stored in the first storage tank 11B is sent to the adsorption unit 41 while monitoring the radiation dose. In this case, the controller 61 outputs an open signal for opening the adsorption on / off valve 41C, the introduction on / off valve 41D, and the discharge on / off valve 41E in the adsorption unit 41 from the state shown in FIG. That is, as shown in FIG. 9, the gas stored in the first storage tank 11B having a pressure higher than the atmospheric pressure passes through the adsorption tower 41B through the adsorption pipe 41A, so that the inside of the casing of the adsorption tower 41B. The radioactive noble gas is adsorbed and stays on the adsorbent, and air (N ₂ or O ₂ ) is discharged from the adsorption tower 41B. In the operation shown in FIG. 9, gas is allowed to pass through one of the plurality of adsorption towers 41B. And when adsorption | suction to the adsorbent of radioactive noble gas is saturated, radioactive noble gas is discharged | emitted from adsorption tower 41B, but this discharged | emitted radioactive noble gas exceeds the predetermined radiation dose, and adsorption radiation detection part 41F Is detected. When radioactive noble gas is detected by the adsorption radiation detection unit 41F, the control unit 61 outputs a close signal for closing the introduction on-off valve 41D and the discharge on-off valve 41E corresponding to the adsorption tower 41B through which gas is currently passed. Then, an opening signal for opening the opening / closing valve 41D and the discharge opening / closing valve 41E corresponding to the adsorption tower 41B through which no gas has yet passed is output. As a result, the adsorption tower 41B through which the gas passes is switched to continuously adsorb the radioactive noble gas. In the case where radioactive rare gas is detected by the adsorption radiation detection unit 41F after passing the gas through all the adsorption towers 41B, the control unit 61 adds an output of a close signal for closing the introduction on-off valve 41D and the discharge on-off valve 41E. Thus, a closing signal for closing the adsorption on-off valve 41C is output. Then, it replaces | exchanges for the new adsorption tower 41B and adsorb | sucks a radioactive noble gas similarly.

  Further, in the operation shown in FIG. 10, the gas is allowed to pass through all of the plurality of adsorption towers 41B. And in each adsorption tower 41B, when adsorption to the adsorbent of radioactive noble gas is saturated, when radioactive noble gas is discharged from adsorption tower 41B and detected by adsorption radiation detection part 41F, control part 61 is A closing signal for closing the introduction opening / closing valve 41D and the discharge opening / closing valve 41E corresponding to the adsorption tower 41B provided with the detected adsorption radiation detection unit 41F is output. In the case where radioactive rare gas is detected by the adsorption radiation detection unit 41F after passing the gas through all the adsorption towers 41B, the control unit 61 adds an output of a close signal for closing the introduction on-off valve 41D and the discharge on-off valve 41E. Thus, a closing signal for closing the adsorption on-off valve 41C is output. Then, it exchanges for the new adsorption tower 41B and adsorb | sucks a radioactive noble gas similarly. Even if there is only one adsorption tower 41B, it is replaced with a new adsorption tower 41B in the same manner.

  9 and 10, the control unit 61 outputs an opening signal for opening the adsorption on-off valve 41C and outputs a signal for driving the dehumidifying unit (in the case of the refrigerator) 51. Thereby, the water | moisture content in gas is removed.

  9 and 10, when the internal pressure of the first storage tank 11B detected by the rare gas storage unit pressure detection unit 41H decreases to be equal to the atmospheric pressure, the control unit 61 causes the compressor 41G to While outputting the signal to drive, the opening signal which opens the pressurization opening-and-closing valve 41Ga is output. In other words, the gas stored in the first storage tank 11B is reliably introduced into the adsorption tower 41B by pressurizing the interior of the first storage tank 11B with the compressor 41G to increase the pressure.

  In addition, when performing the operation | movement shown in FIG.9 and FIG.10, when the krypton was attenuated for several years in the state which stored the radioactive noble gas in the 1st storage tank 11B, the 1st storage tank 11B is monitored, monitoring a radiation dose. The gas stored in the tank may be managed and released. In this case, as shown in FIG. 11, the controller 61 outputs an opening signal for opening the first storage opening / closing valve 11C and the branch exhaust opening / closing valve 31C. That is, 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, and the flow rate is reduced by the throttle valve 31D. The air is released from the exhaust tube 31B to the atmosphere while being suppressed. However, the control unit 61 closes the first storage on-off valve 11C and the branch exhaust on-off valve 31C unless the radiation dose detected by the exhaust radiation detection unit 31E is within a range that does not affect the public exposure. By outputting the closing signal to return to the state shown in FIG. 9 and FIG. 10 (or FIG. 3), the release of gas is stopped. By releasing the radioactive noble gas attenuated in this way to the atmosphere while monitoring the radiation dose, the amount of radioactive noble gas to be adsorbed by the adsorption tower 41B can be reduced, so that the capacity of the adsorption tower 41B can be reduced and the adsorption tower 41B. Can be miniaturized.

  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. 12 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. 13 is a graph for setting the capacity of the first storage unit in the storage container 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. 12, 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. If the relationship between the pressure P ′ ₁ and the capacity V ₁ of the first storage tank 11B is designed as shown in FIG. 13, 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 (rare) connected to the end of the exhaust pipe 3 outside the storage container 100. Gas storage unit 11, a first cooling unit 12 that condenses the vapor in the gas supplied to the first storage unit 11, and a first storage unit 11 that is independently connected to the first storage unit 11. An adsorbing portion 41 that introduces the generated gas and adsorbs the radioactive noble gas in the gas.

  According to the containment vessel maintenance facility, the gas from which radioactive iodine and particulate radioactive material have been removed by the filter unit 2 is sent out from the containment vessel 100 through the exhaust pipe 3. A non-condensable gas containing a rare gas is stored, and vapor that is a condensable gas is condensed by the first cooling unit 12. 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. And the radioactive noble gas stored in the 1st storage part 11 is introduce | transduced into the adsorption | suction part 41, and is adsorb | sucked. For this reason, it is possible to contain radioactive noble gas in the adsorption part 41 instead of the first storage part 11. As a result, the radioactive noble gas inside the storage container 100 is contained separately from the storage container 100, and the dismantling of the equipment such as the storage container 100 and the first storage unit 11 is performed earlier than the radioactive noble gas is attenuated. be able to.

  Moreover, in the storage container maintenance facility of this embodiment, it is preferable to have a dehumidifying part 51 provided between the first storage part 11 and the adsorption part 41 to remove moisture in the gas.

  According to this containment vessel maintenance facility, since the radioactive rare gas is difficult to be adsorbed when it contains moisture, the adsorption efficiency of the radioactive rare gas in the adsorption unit 41 can be improved by removing the moisture in the gas. For this reason, radioactive noble gas can be isolate | separated from air and the non-condensable gas containing the radioactive noble gas stored in the 1st storage part 11 can be reduced significantly. Moreover, the adsorption | suction part 41 can also be reduced in size as much as possible and can be conveyed.

  Further, in the containment vessel maintenance facility of the present embodiment, it is preferable to send the gas stored in the first storage unit 11 by being pressurized by the pressure difference between the first storage unit 11 and the adsorption unit 41 to the adsorption unit 41.

  The adsorption efficiency of the radioactive noble gas in the adsorption unit 41 is improved as the pressure of the gas to be sent is higher. According to this containment vessel maintenance facility, the adsorption efficiency of radioactive noble gas in the adsorption unit 41 can be improved by pressurizing the gas stored in the first storage unit 11 with a pressure difference and sending it to the adsorption unit 41. . For this reason, radioactive noble gas can be isolate | separated from air and the non-condensable gas containing the radioactive noble gas stored in the 1st storage part 11 can be reduced significantly. Moreover, the adsorption | suction part 41 can also be reduced in size as much as possible and can be conveyed.

  Further, in the containment vessel maintenance facility of the present embodiment, a compressor (pressurizing unit) 41G that pressurizes the gas stored in the first storage unit 11 and a rare gas storage unit that detects the pressure inside the first storage unit 11. It is preferable to include the pressure detection unit 41H.

  The adsorption efficiency of the radioactive noble gas in the adsorption unit 41 is improved as the pressure of the gas to be sent is higher. According to the containment vessel maintenance facility, when the internal pressure of the first storage unit 11 is detected by the rare gas storage unit pressure detection unit 41H and the internal pressure of the first storage unit 11 decreases, the compressor 41G The gas stored in the storage unit 11 can be pressurized. For this reason, the adsorption efficiency of the radioactive noble gas in the adsorption | suction part 41 can be improved by pressurizing the gas stored in the 1st storage part 11, and sending it to the adsorption | suction part 41. FIG. As a result, the radioactive noble gas can be separated from the air, and the volume of the non-condensable gas containing the radioactive noble gas stored in the first storage unit 11 can be greatly reduced. Moreover, the adsorption | suction part 41 can also be reduced in size as much as possible and can be conveyed.

  In the containment vessel maintenance facility of the present embodiment, the adsorption unit 41 includes an introduction unit (introduction port 41Ba or the like) for introducing the gas stored in the first storage unit 11, and a gas after the radioactive noble gas is adsorbed. A discharge part (discharge port 41Bb, etc.), an introduction opening / closing valve 41D for opening / closing the introduction part, a discharge opening / closing valve 41E for opening / closing the discharge part, and an adsorption radiation detection part 41F provided in the discharge part It is preferable.

  According to the containment vessel maintenance facility, when the amount of radiation in the gas discharged from the discharge unit exceeds a predetermined value as detected by the adsorption radiation detection unit 41F, it is determined that the adsorption of the radioactive rare gas in the adsorption unit 41 is saturated. can do. For this reason, the introduction of the gas into the adsorption unit 41 can be stopped or switched to the introduction of the gas into another adsorption unit 41.

  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, and a first storage part (rare gas storage) connected to the end of the exhaust pipe 3 outside the storage container 100 Part) 11, the first cooling part 12 that condenses the vapor in the gas supplied to the first storage part 11, and the first storage part 11 connected independently to the first storage part 11. A containment vessel maintenance method using a containment vessel maintenance facility having an adsorbing portion 41 that introduces gas and adsorbs a radioactive noble gas in the gas, and stores the containment vessel 100 in the first reservoir 11 at the time of an accident. Inside The includes a storage step of condensing the vapor in the gas by the first cooling portion 12 while stored, the next storing step, the adsorption step of sending the gas stored in the first storage unit 11 to the suction unit 41.

  According to this containment vessel maintenance method, the gas from which radioactive iodine and particulate radioactive material have been removed by the filter unit 2 is sent out from the containment vessel 100 through the exhaust pipe 3, and in the storage step, the first storage unit 11, non-condensable gas containing radioactive noble gas is stored, and vapor that is condensable gas is condensed by the first cooling unit 12. 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. Moreover, in the adsorption step, the radioactive noble gas stored in the first storage unit 11 is introduced into the adsorption unit 41 and adsorbed. For this reason, it is possible to contain radioactive noble gas in the adsorption part 41 instead of the first storage part 11. As a result, the radioactive noble gas inside the storage container 100 is contained separately from the storage container 100, and the dismantling of the equipment such as the storage container 100 and the first storage unit 11 is performed earlier than the radioactive noble gas is attenuated. be able to.

  Further, in the containment vessel maintenance method of the present embodiment, the containment vessel maintenance facility has a dehumidifying part 51 provided between the first storage part 11 and the adsorption part 41 to remove moisture in the gas, It is preferable to include a dehumidification step of removing moisture in the gas sent to the adsorption unit 41 by the dehumidification unit 51 before the adsorption step.

  According to this containment container maintenance method, since radioactive noble gas is difficult to be adsorbed when it contains moisture, the adsorption efficiency of radioactive noble gas in the adsorption process can be improved by removing the moisture in the gas by the dehumidification process before the adsorption process. Can be improved. For this reason, radioactive noble gas can be isolate | separated from air and the non-condensable gas containing the radioactive noble gas stored in the 1st storage part 11 can be reduced significantly. Moreover, the adsorption | suction part 41 can also be reduced in size as much as possible and can be conveyed.

  In the containment vessel maintenance method of the present embodiment, the containment vessel maintenance facility uses a compressor (pressurization unit) 41G that pressurizes the gas stored in the first storage unit 11 and the internal pressure of the first storage unit 11. A rare gas reservoir pressure detector 41H to detect, and the gas stored in the first reservoir 11 by being pressurized by the pressure difference between the first reservoir 11 and the adsorber 41 to the adsorber 41 When the pressure detected by the feed and rare gas reservoir pressure detector 41H is lower than a predetermined value, it is preferable to pressurize the gas stored in the first reservoir 11 by the compressor 41G.

  The adsorption efficiency of the radioactive noble gas in the adsorption unit 41 is improved as the pressure of the gas to be sent is higher. According to this containment vessel maintenance method, when the internal pressure of the first reservoir 11 is detected by the rare gas reservoir pressure detector 41H and the internal pressure of the first reservoir 11 decreases, the compressor 41G The gas stored in the storage unit 11 can be pressurized. For this reason, the adsorption efficiency of the radioactive noble gas in the adsorption | suction part 41 can be improved by pressurizing the gas stored in the 1st storage part 11, and sending it to the adsorption | suction part 41. FIG. As a result, the radioactive noble gas can be separated from the air, and the volume of the non-condensable gas containing the radioactive noble gas stored in the first storage unit 11 can be greatly reduced. Moreover, the adsorption | suction part 41 can also be reduced in size as much as possible and can be conveyed.

  In the containment vessel maintenance method of the present embodiment, the adsorption unit 41 of the containment vessel maintenance facility adsorbs the introduction unit (introduction port 41Ba or the like) for introducing the gas stored in the first storage unit 11 and the radioactive noble gas. A discharge part (discharge port 41Bb, etc.) for discharging the gas after being discharged, an introduction opening / closing valve 41D for opening / closing the introduction part, a discharge opening / closing valve 41E for opening / closing the discharge part, and an adsorption radiation detection part provided in the discharge part 41F, and when the radiation amount in the gas discharged from the discharge unit by the detection of the adsorption radiation detection unit 41F exceeds a predetermined value, it is preferable to close the introduction on-off valve 41D and the discharge on-off valve 41E. .

  According to the containment vessel maintenance method, when the radiation dose in the gas discharged from the discharge unit exceeds a predetermined value as detected by the adsorption radiation detection unit 41F, it is determined that the adsorption of the radioactive rare gas in the adsorption unit 41 is saturated. can do. For this reason, the introduction of the gas into the adsorption unit 41 can be stopped or switched to the introduction of the gas into another adsorption unit 41.

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 (rare gas storage part)
11A 1st storage piping 11B 1st storage tank 11C 1st storage on-off valve 12 1st cooling part (cooling part)
12A Circulation piping 12B Heat exchanger 12C Cooling pump 12D Sprinkler 12E 1st cooling on-off valve 12F 1st cooling on-off valve 13 1st condensed water sending part 13A Outlet piping 13B Outlet pump 13C Outlet on-off valve 13D Outlet on-off valve 13E Check valve 14 1st storage part water level detection part 15 1st storage part pressure detection part (rare gas storage part pressure detection part)
21 2nd storage part 21A 2nd storage pipe 21B 2nd storage tank 21C 2nd storage on-off valve 22 2nd cooling part 22A Circulation pipe 22Aa Cooling pipe 22Ab Cooling pipe 22B Heat exchanger 22C Cooling pump 22D Sprinkler 22E 2nd cooling opening / closing Valve 22F Second cooling on-off valve 23 Second condensate delivery section 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 detection section 25 Second reservoir pressure Detection section 31 Exhaust section 31A Branch exhaust pipe 31B Exhaust cylinder 31C Branch exhaust open / close valve 31D Throttle valve 31E Exhaust radiation detection section 41 Adsorption section 41A Adsorption pipe 41Aa, 41Ab, 41Ac, 41Ad Branch adsorption pipe 41B Adsorption tower 41Ba Inlet 41Bb Outlet 41C Adsorption on-off valve 41D Introduction on-off valve 41 Discharge on-off valve 41F adsorption radiation detector 41G compressor (pressurizing)
41Ga Pressurization on-off valve 41H Noble gas storage part pressure detection part 51 Dehumidification part 61 Control part 100 Containment vessel 101 Reactor pressure vessel

Claims (9)

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 rare gas reservoir connected to the end of the exhaust pipe outside the containment vessel;
A cooling unit for condensing vapor in the gas supplied to the rare gas storage unit;
An adsorption unit that is independently connected to the noble gas storage unit and introduces a gas stored in the noble gas storage unit to adsorb a radioactive noble gas in the gas; and
Containment vessel maintenance equipment.   The containment vessel maintenance facility according to claim 1, further comprising a dehumidifying unit that is provided between the rare gas storage unit and the adsorption unit and removes moisture in the gas.   The containment vessel maintenance facility according to claim 1 or 2, wherein the gas stored in the rare gas reservoir is pressurized by a pressure difference between the rare gas reservoir and the adsorber and is sent to the adsorber. A pressurizing unit that pressurizes the gas stored in the rare gas storage unit;
A rare gas reservoir pressure detector that detects the pressure inside the rare gas reservoir;
The containment vessel maintenance facility according to any one of claims 1 to 3, further comprising: The adsorption part is
An introduction part for introducing the gas stored in the rare gas storage part;
A discharge part for discharging the gas after the adsorbed radioactive noble gas;
An introduction on-off valve for opening and closing the introduction portion;
A discharge on / off valve that opens and closes the discharge section;
An adsorption radiation detection unit provided in the discharge unit;
The containment vessel maintenance facility according to any one of claims 1 to 4, further comprising: 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 rare gas reservoir connected to the end of the exhaust pipe outside the containment vessel;
A cooling unit for condensing vapor in the gas supplied to the rare gas storage unit;
An adsorption unit that is independently connected to the noble gas storage unit and introduces a gas stored in the noble gas storage unit to adsorb a radioactive noble gas in the gas; and
A containment vessel maintenance method using a containment vessel maintenance facility comprising:
A storage step of condensing vapor in the gas by the cooling unit while storing the gas inside the storage container in the rare gas storage unit at the time of an accident,
Next to the storage step, an adsorption step of sending the gas stored in the rare gas storage unit to the adsorption unit;
Containment container maintenance method. The containment vessel maintenance facility has a dehumidifying unit that is provided between the rare gas storage unit and the adsorption unit to remove moisture in the gas,
The containment vessel maintenance method according to claim 6, further comprising a dehumidification step of removing moisture in the gas sent to the adsorption unit by the dehumidification unit before the adsorption step. The containment vessel maintenance facility includes a pressurization unit that pressurizes the gas stored in the rare gas storage unit, and a rare gas storage unit pressure detection unit that detects a pressure inside the rare gas storage unit. And
The pressure detected by the pressure difference between the rare gas storage part and the adsorption part is sent to the adsorption part, and the pressure detected by the rare gas storage part pressure detection part has a predetermined value. The containment vessel maintenance method according to claim 6 or 7, wherein when the pressure is below, the gas stored in the rare gas storage unit is pressurized by the pressurization unit. The adsorption part of the containment vessel maintenance facility opens and closes the introduction part for introducing the gas stored in the rare gas storage part, the discharge part for discharging the gas after the radioactive rare gas is adsorbed, and the introduction part An open / close valve for opening, a discharge open / close valve for opening / closing the discharge unit, and an adsorption radiation detection unit provided in the discharge unit,
The introduction open / close valve and the exhaust open / close valve are closed when the radiation amount in the gas discharged from the discharge unit by the detection of the adsorption radiation detection unit exceeds a predetermined value. Containment container maintenance method described in 1.

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