Radioactive gas treatment system, radioactive gas treatment method, and portable gas treatment apparatus

Abstract

To provide a radioactive gas treatment system, a radioactive gas treatment method, and a portable gas treatment device capable of appropriately treating waste gas.SOLUTION: A radioactive gas treatment system according to the present disclosure includes a fixed gas treatment device provided in a gas line through which a waste gas containing a radioactive noble gas discharged from a nuclear reactor flows and configured to adsorb the radioactive noble gas contained in the waste gas, and a transportable gas treatment device including a supply line to which a treatment target gas containing the radioactive noble gas adsorbed by the fixed gas treatment device is supplied and an adsorption unit connected to the supply line and capable of moving with respect to the nuclear reactor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a radioactive gas treatment system, a radioactive gas treatment method, and a portable gas treatment device. [Background technology]

[0002] When a fuel leak occurs in the reactor of a nuclear power plant, it becomes necessary to treat the fluid containing radioactive material. For example, radioactive gases containing radioactive material mixed in the primary coolant must be separated and temporarily stored in a gas surge tank or gas decay tank. The waste gas from a light water reactor is mostly nitrogen, with traces of hydrogen and radioactive noble gases.

[0003] For example, Patent Document 1 below discloses a technology in which the volume of hydrogen gas contained in waste gas is reduced using a hydrogen recombination device or the like, and waste gas containing radioactive rare gases is subjected to a rare gas attenuation process using activated carbon (charcoal bed) to sufficiently attenuate the radioactivity before being released into the atmosphere. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 1761875 Summary of the Invention [Problem to be solved by the invention]

[0005] However, even in the case of the technology described in Patent Document 1, the processing capacity of the charcoal bed and the capacity of the storage tank for the radioactive noble gas are limited, so the degassing speed of the radioactive noble gas contained in the waste gas has to be limited, which has been a factor in prolonging the shutdown period of the nuclear power plant.

[0006] In view of the above-mentioned problems, the present disclosure aims to provide a radioactive gas treatment system, a radioactive gas treatment method, and a portable gas treatment device that can appropriately treat radioactive gas. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the objectives, the radioactive gas treatment system according to the present disclosure comprises a fixed gas treatment device that is provided in a gas line through which waste gas containing radioactive noble gases discharged from a nuclear reactor flows and adsorbs the radioactive noble gases contained in the waste gas, and a portable gas treatment device that has a supply line through which gas to be treated containing the radioactive noble gases adsorbed by the fixed gas treatment device is supplied and an adsorption unit connected to the supply line and that can be moved to the nuclear reactor.

[0008] In order to solve the above-mentioned problems and achieve the objectives, the radioactive gas treatment method of the present disclosure includes the steps of adsorbing the radioactive rare gas contained in the waste gas using a fixed gas treatment device installed in a gas line through which waste gas containing the radioactive rare gas discharged from a nuclear reactor flows; connecting a portable gas treatment device that can be moved to the nuclear reactor to the fixed gas treatment device; supplying the gas to be treated, which contains the radioactive rare gas adsorbed by the fixed gas treatment device, to the portable gas treatment device and adsorbing the radioactive rare gas in an adsorption section of the portable gas treatment device; and detaching the portable gas treatment device from the fixed gas treatment device.

[0009] In order to solve the above-mentioned problems and achieve the objectives, the portable gas treatment device of the present disclosure is a portable gas treatment device that recovers radioactive noble gases discharged from a nuclear reactor, and is detachable from a fixed gas treatment device, and is equipped with a supply line through which a gas to be treated containing a radioactive noble gas adsorbed by a fixed gas treatment device that adsorbs the radioactive noble gases is supplied, an adsorption unit connected to the supply line, an exhaust line that discharges the gas to be treated that has passed through the adsorption unit to the outside, and a drive mechanism that can be moved to the nuclear reactor. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to provide a radioactive gas treatment system, a radioactive gas treatment method, and a portable gas treatment device that can appropriately treat waste gas. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an overview of a radioactive gas treatment system for a nuclear power plant according to the present disclosure. [Figure 2] FIG. 2 is a diagram showing an example of the configuration of a fixed gas treatment device according to the present disclosure. [Figure 3] FIG. 3 is a diagram showing an example of the configuration of a portable gas processing device according to the present disclosure. [Figure 4] FIG. 4 is a diagram showing a configuration example of the adsorption / desorption unit of the portable gas processing device according to the present disclosure. [Figure 5] FIG. 5 is a diagram illustrating the first stage of the radioactive gas treatment method according to the present disclosure. [Figure 6] FIG. 6 is a diagram illustrating a second stage of the radioactive gas treatment method according to the present disclosure. [Figure 7] FIG. 7 is a diagram illustrating a third stage of the radioactive gas treatment method according to the present disclosure. [Figure 8] FIG. 8 is a diagram illustrating a fourth stage of the radioactive gas treatment method according to the present disclosure. [Figure 9] FIG. 9 is a diagram showing an example of the configuration of a control device of a portable gas processing device according to the present disclosure. [Figure 10] FIG. 10 is a hardware configuration diagram illustrating an example of a computer that realizes the functions of the control device according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. However, the present disclosure is not limited to the embodiments described below.

[0013] (Configuration of radioactive gas treatment system) First, an overview of a radioactive gas treatment system 1 for a nuclear power plant according to the present disclosure will be described with reference to Fig. 1. Fig. 1 is a diagram illustrating an overview of a radioactive gas treatment system for a nuclear power plant according to the present disclosure. As shown in Fig. 1, the radioactive gas treatment system 1 is connected to a nuclear reactor 300. The radioactive gas treatment system 1 includes a portable gas treatment device 100 and a fixed gas treatment device 200.

[0014] The nuclear reactor 300 includes a containment vessel 311, a pressure vessel 312, a steam generator 313, a high-temperature side supply piping 314, a low-temperature side supply piping 315, a pressurizer 316, and a primary system cooling water pump 317. The containment vessel 311 houses therein the pressure vessel 312 and multiple (one shown) steam generators 313. The pressure vessel 312 and the steam generators 313 housed in the containment vessel 311 are connected via the high-temperature side supply piping 314 and the low-temperature side supply piping 315.

[0015] A pressurizer 316 is provided on the high-temperature side supply piping 314, and a primary cooling water pump 317 is provided on the low-temperature side supply piping 315. A radioactive gas treatment system 1 including a fixed gas treatment device 200 and a portable gas treatment device 100 is connected to the containment vessel 311. A dehumidification tower 21 (not shown) is provided between the fixed gas treatment device 200 and the portable gas treatment device 100.

[0016] The fixed gas treatment device 200 is connected to the containment vessel 311. For example, when a fuel leak occurs in the reactor 300, a large amount of waste gas containing radioactive rare gases and the like is generated inside the containment vessel 311. The fixed gas treatment device 200 releases and treats the waste gas from the containment vessel 311. That is, the fixed gas treatment device 200 is connected to the containment vessel 311 via a gas line L1. Furthermore, the fixed gas treatment device 200 can be connected to the portable gas treatment device 100 via a connector. The fixed gas treatment device 200 may be connected to a path of the primary coolant to treat the waste gas contained in the primary cooling system. For example, it may be connected to a pressurizer 316.

[0017] The target gas treated in the fixed gas treatment device 200 is introduced into the portable gas treatment device 100 via a gas line (supply line). The target gas treated in the fixed gas treatment device 200 includes air, water vapor, radioactive noble gases, etc. Radioactive noble gases include xenon (Xe-133) and krypton (Kr-85). The portable gas treatment device 100 is equipped with a drive mechanism, such as a drive source and drive wheels, and is movable relative to the nuclear reactor 300. The portable gas treatment device 100 of this embodiment is a vehicle that is operated by a driver. The portable gas treatment device 100 removes water vapor from the waste gas, then adsorbs and removes the radioactive noble gas from the waste gas, concentrates it, and stores it. The concentrated radioactive noble gas is stored in the portable gas treatment device 100 until it is ready for final disposal.

[0018] The method for treating radioactive gas using the radioactive gas treatment system 1 includes the steps of adsorbing the radioactive noble gas contained in the waste gas by a fixed gas treatment device 200 installed in a gas line through which waste gas containing the radioactive noble gas discharged from the containment vessel 311 of the reactor 300 flows, connecting a portable gas treatment device 100 that can be moved to the reactor to the fixed gas treatment device 200, supplying the gas to be treated, including the radioactive noble gas adsorbed by the fixed gas treatment device 200, to the portable gas treatment device 100 and adsorbing the radioactive noble gas by an adsorption unit of the portable gas treatment device, and detaching the portable gas treatment device 100 from the fixed gas treatment device 200. The timing for connecting the portable gas treatment device 100 to the solid-state gas treatment device 200 may be before or during gas treatment by the fixed gas treatment device 200.

[0019] As described above, the radioactive gas treatment system 1 performs radioactive gas treatment using the fixed gas treatment device 200, and then further performs radioactive gas treatment using the portable gas treatment device 100. Therefore, if a fuel leak or the like occurs in the containment vessel 311 and the concentration of radioactive noble gas inside the containment vessel 311 rises suddenly, by connecting the portable gas treatment device 100 to the fixed gas treatment device 200, it is possible to quickly treat the radioactive noble gas that exceeds the treatment capacity of the fixed gas treatment device 200.

[0020] (Configuration of fixed gas treatment device) Next, the configuration of a fixed gas treatment device 200 according to the present disclosure will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of the configuration of a fixed gas treatment device according to the present disclosure. As shown in Fig. 2, the fixed gas treatment device 200 according to the present disclosure includes a primary coolant piping 211, a volume control tank 212, an extraction pipe 214, a filling line 215, a pipe 216, a hydrogen recombiner 217, a pipe 218, a charcoal head unit 219, and an exhaust pipe 220. The configuration of these components will be described in order below.

[0021] The primary coolant piping 211 is connected to the containment vessel 311 and is a piping through which the primary coolant (waste gas containing steam of the primary coolant) from the containment vessel 311 flows. An extraction pipe 214 is connected to the primary coolant piping 211 and the primary coolant (waste gas) is extracted by the extraction pipe 214. The extracted primary coolant (waste gas) is introduced into the volume control tank 212 by the extraction pipe 214.

[0022] The volume control tank 212 is a tank that adjusts the amount of primary coolant (waste gas) flowing in the primary coolant piping 211. The volume control tank 212 is supplied with the primary coolant (waste gas) extracted from the primary coolant piping 211, and adjusts the amount of primary coolant (waste gas) flowing in the primary coolant piping 211 by controlling the amount of primary coolant (waste gas) supplied to the primary coolant piping 211.

[0023] The extraction pipe 214 extracts the primary coolant (waste gas) from the primary coolant pipe 211. The extraction pipe 214 is a pipe that connects the primary coolant pipe 211 and the volume control tank 212. In other words, the extraction pipe 214 guides the primary coolant (waste gas) extracted from the primary coolant pipe 211 to the volume control tank 212.

[0024] The filling line 215 is a pipe that connects the volume control tank 212 and the primary coolant pipe 211. That is, the filling line 215 returns the primary coolant accumulated in the liquid phase part of the volume control tank 212 to the primary coolant pipe 211.

[0025] The pipe 216 is a pipe that connects the volume control tank 212 and the hydrogen recombiner 217. That is, the pipe 216 guides the waste gas accumulated in the gas phase of the volume control tank 212 to the hydrogen recombiner 217.

[0026] The hydrogen recombiner 217 recombines hydrogen and oxygen using a catalytic reaction to reduce the hydrogen concentration in the waste gas. The hydrogen recombiner 217 includes a catalyst cartridge and a housing. The catalyst cartridge is a frame formed from a stainless steel plate, filled with a catalyst, and may have multiple slots for contacting the waste gas with the catalyst. Palladium, for example, may be used as the catalyst. A hydrophobic coating may be applied to the catalyst surface to protect it from a highly humid atmosphere and facilitate contact of hydrogen and oxygen with the catalyst. The housing may be made of stainless steel and may be designed to house the catalyst cartridge, hold the catalyst cartridge at an appropriate interval for hydrogen treatment, and provide an appropriate gas flow for hydrogen treatment.

[0027] The pipe 218 is a pipe that connects the hydrogen recombiner 217 and the charcoal head 219. That is, the pipe 218 guides the waste gas, whose hydrogen concentration has been reduced in the hydrogen recombiner 217, to the charcoal head 219.

[0028] The charcoal head 219 is a rare gas attenuation treatment device that uses activated carbon. Activated carbon is made from carbonaceous materials such as coal and coconut shells, and is produced by reacting them with gases and chemicals at high temperatures. The activated carbon has micropores with diameters of approximately 1 to 20 nm. The micropores in the activated carbon are formed in a mesh-like pattern, and the walls of these micropores have a large surface area, allowing various substances to be adsorbed onto their surfaces. The charcoal head 219 is equipped with activated carbon inside a tank such as a pressure vessel. This allows radioactive rare gases to be adsorbed onto the activated carbon.

[0029] The exhaust pipe 220 is a pipe for discharging the target gas, which is waste gas after the radioactive rare gas has been adsorbed by the charcoal head 219. The exhaust pipe 220 may be open to the atmosphere under normal conditions. The exhaust pipe 220 is provided with a connector to which the piping of the portable gas treatment device 100 (gas line L1, which will be described later) can be connected. The connector may be provided with an air seal to prevent leakage of the target gas.

[0030] (Configuration of portable gas treatment device) Next, the configuration of portable gas processing device 100 according to the present disclosure will be described with reference to Fig. 3. Fig. 3 is a diagram showing an example of the configuration of portable gas processing device according to the present disclosure. As shown in Fig. 3, portable gas processing device 100 according to the present disclosure includes an adsorption / desorption unit 30 and a control device 10. Below, these components will be briefly described in order.

[0031] The adsorption / desorption unit 30 recovers the radioactive rare gas by adsorbing the radioactive rare gas onto an adsorbent and then desorbing the radioactive rare gas from the adsorbent. The adsorption / desorption unit 30 is provided with an opening through which the radioactive rare gas can flow. That is, the adsorption / desorption unit 30 can be connected to the fixed gas treatment device 200 via a gas line L1, a connector, or the like. The adsorption / desorption unit 30 will be described in detail later.

[0032] The control device 10 comprehensively controls the portable gas processing device 100. The control device 10 may be an information processing device including input devices such as switches and levers, output devices such as a display, and a calculation device such as a CPU (Central Processing Unit). A detailed description of the control device 10 will be given later.

[0033] As shown in FIG. 1, the portable gas treatment device 100 may be mounted on the bed of a truck, trailer, or the like. This allows the device to be parked in a parking lot near the management office during normal operation when no fuel leaks occur, and when a fuel leak occurs, the device can be connected to the fixed gas treatment device 200 at the nuclear power plant to remove radioactive noble gases from the gas to be treated. Furthermore, when a fuel leak occurs at a nuclear power plant and the concentration of radioactive noble gases increases, the device can be connected to the fixed gas treatment device 200 to quickly recover the radioactive noble gases. In addition to recovering radioactive noble gases, the portable gas treatment device 100 can also be used as a DAC (Direct Air Capture) device to recover CO2.

[0034] (Configuration of adsorption / desorption unit) Next, the configuration of the adsorption / desorption unit 30 according to the present disclosure will be described with reference to Fig. 4. Fig. 4 is a diagram showing an example of the configuration of the adsorption / desorption unit of the portable gas processing device according to the present disclosure. The configuration of the adsorption / desorption unit 30 according to the present disclosure will be described along with the gas flow in Fig. 4.

[0035] First, gas line L2, which is connected to gas line (supply line) L1 via dehumidification tower 21, is connected at its downstream side to multiple branch lines L3, L4, L5, and L6. Adsorption unit 31 has multiple adsorption towers 41, 42, 43, and 44. The branch lines L3, L4, L5, and L6 are connected at their downstream sides to the inlets of the respective adsorption towers 41, 42, 43, and 44.

[0036] Although not shown, the adsorption towers 41, 42, 43, and 44 each have a type of filter in which an adsorbent is packed in a container such as a tank. The solid adsorbent may be a zeolite-based adsorbent, and mordenite is preferred. The adsorption towers 41, 42, 43, and 44 selectively adsorb radioactive rare gases such as xenon and krypton contained in the gas to be treated as the gas passes through them. Meanwhile, while the radioactive rare gases are selectively adsorbed through the adsorption towers 41, 42, 43, and 44, unadsorbed air passes through them. Branch lines L3, L4, L5, and L6 connected to the adsorption towers 41, 42, 43, and 44 are provided with on-off valves (inlet switching valves) V1, V2, V3, and V4, respectively.

[0037] The on-off valves V1, V2, V3, and V4 may be motor-operated valves driven by an electric motor, such as ball valves or swing-type gate valves. The on-off valves V1, V2, V3, and V4 are connected to the control device 10 by wire or wirelessly so that information can be exchanged. That is, the on-off valves V1, V2, V3, and V4 are controlled to open and close by control signals from the control device 10.

[0038] Branch lines L7, L8, L9, and L10 are connected to the outlets of the adsorption towers 41, 42, 43, and 44. The branch lines L7, L8, L9, and L10 are connected downstream to a single gas line L22. The branch lines L7, L8, L9, and L10 are provided with on-off valves V13, V14, V15, and V16. The downstream side of the gas line L22 may be open to the atmosphere or may be connected to a chimney 400.

[0039] Branch lines L3, L4, L5, and L6 are connected to branch lines (concentration lines) L11, L12, L13, and L14 downstream of on-off valves V1, V2, V3, and V4, i.e., on the adsorption towers 41, 42, 43, and 44 sides, respectively. Each of the branch lines L11, L12, L13, and L14 is connected downstream to a single gas line L15. On-off valves (desorption switching valves) V5, V6, V7, and V8 are provided in the branch lines L11, L12, L13, and L14. A vacuum pump (suction force applying unit) 54 is provided in the gas line L15. The vacuum pump 54 is capable of applying suction force to the inlets of the adsorption towers 41, 42, 43, and 44.

[0040] A gas tank 55 constituting the reservoir 33 is connected downstream of the gas line L15. The gas tank 55 is preferably a pressure vessel. The gas tank 55 and the gas line L2 are connected by a circulation line L16. The downstream side of the circulation line L16 is connected between the fixed gas processing device 200 on the gas line L2 and the on-off valves V1, V2, V3, and V4. A circulation pump 56 is provided on the circulation line L16.

[0041] The concentrating unit 32 desorbs and concentrates the radioactive rare gas adsorbed in the adsorption unit 31 (adsorption towers 41, 42, 43, and 44). That is, the concentrating unit 32 switches between using the four adsorption towers 41, 42, 43, and 44 for adsorption, normal pressure return, or regeneration. For example, the adsorption towers 41 and 42 may be used for adsorption, the adsorption tower 43 may be used for normal pressure return, and the adsorption tower 44 may be used for regeneration. That is, after the adsorption tower 41 is used for adsorption, the adsorption tower 42 is used for adsorption to adsorb the radioactive rare gas contained in the gas to be treated. Meanwhile, the adsorption tower 43 is used for normal pressure return and is prepared for its next use for adsorption. The adsorption tower 44 is used for regeneration, and is regenerated by desorbing and concentrating the adsorbed radioactive rare gas.

[0042] Therefore, the concentration section 32 is composed of branch lines L11, L12, L13, and L14, a gas line L15, on-off valves V5, V6, V7, and V8, and a vacuum pump 54. In addition to the above components, the concentration section 32 is also composed of branch lines L17, L18, L19, and L20, a gas line (discharge line) L22, on-off valves V9, V10, V11, and V12, an air treatment device 60, and a supply pump 61.

[0043] The storage unit 33 stores the radioactive rare gas concentrated in the concentration unit 32. That is, when compressed air is supplied to the adsorption towers 41, 42, 43, and 44 and used for regeneration, the radioactive rare gas adsorbed in the adsorption towers 41, 42, 43, and 44 is desorbed and sent to the gas tank 55 serving as the storage unit 33. The gas tank 55 stores the radioactive rare gas sent from the adsorption towers 41, 42, 43, and 44, thereby concentrating the radioactive rare gas.

[0044] In the first embodiment, the adsorption unit 31 is configured with four adsorption towers 41, 42, 43, and 44, but is not limited to this configuration. For example, the adsorption unit 31 may be configured with two adsorption towers, one of which is used for adsorption and the other for normal pressure return and regeneration. Alternatively, the adsorption unit 31 may be configured with five or more adsorption towers, with multiple adsorption towers used for adsorption, normal pressure return, and regeneration.

[0045] (First stage of radioactive gas treatment method) Next, the radioactive gas processing method according to the present disclosure will be described with reference to Fig. 5. Fig. 5 is a diagram showing the first stage of the radioactive gas processing method according to the present disclosure. The radioactive gas processing method according to the present disclosure will be described for each step shown in Fig. 5.

[0046] After the target gas treated in the fixed gas treatment device 200 has water vapor removed by the dehumidification tower 21, it is introduced from the gas line L2 through the branch line L3 into the adsorption tower 41 (step S1). The adsorption tower 41 selectively adsorbs and removes radioactive rare gases (xenon, krypton) contained in the target gas. While the radioactive rare gases are being selectively adsorbed, the adsorption tower 41 passes air and other gases that have not been adsorbed, and the air and other gases are released into the atmosphere from the chimney 400 via the branch line L7 and the gas line L22.

[0047] When the amount of radioactive rare gas adsorbed in the adsorption tower 41 reaches a predetermined amount or the pressure in the adsorption tower 41 reaches a predetermined pressure value, the adsorption unit 31 switches to introducing the target gas into the adsorption tower 42 (step S2). That is, the adsorption unit 31 uses the adsorption tower 42 for adsorption after the adsorption tower 41. To this end, the control device 10 closes the on-off valves V1 and V13 on the branch lines L3 and L7 and opens the on-off valves V2 and V14 on the branch lines L4 and L8. The target gas treated in the fixed gas treatment device 200 is then introduced into the adsorption tower 42 through the gas line L2 and the branch line L4. The adsorption tower 42 adsorbs and removes radioactive rare gases (xenon and krypton) contained in the target gas. The adsorption tower 42 passes air, etc. from which the radioactive rare gases have been removed, and the air, etc. is released into the atmosphere from the chimney 400 through the branch line L8 and the gas line L22.

[0048] On the other hand, when the target gas is introduced into the adsorption tower 41 and the radioactive rare gas is being adsorbed, if the radioactive rare gas is adsorbed in the adsorption tower 43, the adsorption tower 43 is regenerated (step S3). That is, the adsorption unit 31 uses the adsorption tower 43 for regeneration. To do this, the on-off valve V7 of the branch line L13 is opened, and the on-off valves V5, V6, and V8 of the branch lines L11, L12, and L14 are kept closed. Then, the vacuum pump 54 is driven. The on-off valves V9, V10, and V12 of the branch lines L17, L18, and L20 are closed, and the supply pump 61 is stopped. Then, the vacuum pressure (suction force) of the vacuum pump 54 acts on the inlet of the adsorption tower 43 through the gas line L15 and the branch line L13. The adsorption tower 43 desorbs the adsorbed radioactive rare gas by the suction force acting on the inlet. The radioactive rare gas desorbed from the adsorption tower 43 is sent to the gas tank 55 of the storage section 33 through the branch line L13 and the gas line L15 and stored therein.

[0049] Furthermore, after a predetermined time has elapsed since the start of regeneration treatment of the adsorption tower 43, the on-off valve V11 of the branch line L19 is opened, and the supply pump 61 is driven. The supply pump 61 then supplies air dried in the air treatment device 60 to the outlet of the adsorption tower 43 via the gas line L21 and the branch lines L19 and L9. The adsorption tower 43 is backwashed by the pressure of the air supplied to the outlet, promoting desorption of the adsorbed radioactive rare gas. When the regeneration treatment of the adsorption tower 43 is completed, the on-off valve V7 of the branch line L13 is closed, and the vacuum pump 54 is stopped. Furthermore, the on-off valve V11 of the branch line L19 is closed, and the supply pump 61 is stopped.

[0050] When the adsorption tower 41 is used for adsorption and the adsorption tower 43 is used for regeneration, the adsorption tower 44 is used for returning to normal pressure after the regeneration process is completed (step S4). That is, by opening the on-off valve V12 of the branch line L20, the supply air from the supply pump 61 is supplied to the adsorption tower 44. That is, air dried in the air treatment device 60 is supplied from the supply pump 51 to the adsorption tower 44 via the gas line L21 and the branch lines L20 and L10. When the pressure in the adsorption tower 42 reaches a predetermined value, the supply of air from the supply pump 61 is stopped.

[0051] Furthermore, if necessary, the circulation pump 56 is operated to return the radioactive rare gas stored in the gas tank 55 through the circulation line L16 to the gas line L2, and the radioactive rare gas is adsorbed in the adsorption towers 41, 42, 43, and 44 of the adsorption section 31. When the concentration of the radioactive rare gas stored in the gas tank 55 is low, the circulation pump 56 is operated to circulate the radioactive rare gas to the adsorption tower inlet of the adsorption section 31 via the circulation line L16, and by performing adsorption and desorption again, a rare gas with an even higher concentration can be stored in the gas tank 55.

[0052] (Second stage of radioactive gas treatment method) Next, the second stage of the radioactive gas processing method according to the present disclosure will be described with reference to Fig. 6. Fig. 6 is a diagram showing the second stage of the radioactive gas processing method according to the present disclosure. The second stage of the radioactive gas processing method according to the present disclosure will be described for each step shown in Fig. 6.

[0053] In the second stage of the radioactive gas treatment method, the gas to be treated treated in the fixed gas treatment device 200 has water vapor removed by the dehumidification tower 21, and then is introduced from the gas line L2 through the branch line L4 into the adsorption tower 42 (step S1). That is, in the second stage of the radioactive gas treatment method, first, the adsorption treatment of the radioactive rare gas contained in the gas to be treated is performed in the adsorption tower 42. The adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 42 is the same as the adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 41 in the first stage of the radioactive gas treatment method described above, and therefore a description thereof will be omitted.

[0054] Next, when the amount of radioactive rare gas adsorbed in the adsorption tower 42 reaches a predetermined amount or the pressure in the adsorption tower 42 reaches a predetermined pressure value, the adsorption tower 43 to which the gas to be treated is introduced is switched (step S2). That is, the adsorption unit 31 uses the adsorption tower 43 for adsorption after the adsorption tower 42. To this end, the control device 10 closes the on-off valves V2 and V14 on the branch lines L4 and L8 and opens the on-off valves V3 and V15 on the branch lines L5 and L9. The adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 43 is the same as the adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 42 in the first stage of the radioactive gas treatment method described above, and therefore will not be described again.

[0055] On the other hand, when the gas to be treated is introduced into the adsorption tower 42 and the radioactive rare gas is being adsorbed, if the radioactive rare gas is adsorbed in the adsorption tower 44, the adsorption tower 44 is regenerated (step S3). That is, the adsorption unit 31 uses the adsorption tower 44 for regeneration. To this end, the control device 10 opens the on-off valve V8 of the branch line L14 and keeps the on-off valves V5, V6, and V7 of the branch lines L11, L12, and L13 closed. Then, the control device 10 drives the vacuum pump 54. The desorption of the radioactive rare gas in the adsorption tower 44 by the vacuum pump 54 is the same as that in the adsorption tower 43 in the first stage of the radioactive gas treatment method described above, and therefore will not be described again.

[0056] Furthermore, after a predetermined time has elapsed since the start of regeneration treatment of the adsorption tower 44, the on-off valve V12 of the branch line L20 is opened and the supply pump 61 is driven. The regeneration treatment by the supply pump 61 in the adsorption tower 44 is the same as that in the adsorption tower 43 in the first stage of the radioactive gas treatment method described above, and therefore a description thereof will be omitted. When the regeneration treatment in the adsorption tower 44 is completed, the on-off valve V8 of the branch line L14 is closed and the vacuum pump 54 is stopped. Furthermore, the on-off valve V12 of the branch line L20 is closed and the supply pump 61 is stopped.

[0057] When the adsorption tower 42 is used for adsorption and the adsorption tower 44 is used for regeneration, the adsorption tower 41 is used for returning to normal pressure after the regeneration process is completed (step S4). That is, the on-off valve V9 of the branch line L17 is opened to supply the supply air from the supply pump 61 to the adsorption tower 41. That is, the air dried in the air treatment device 60 is supplied from the supply pump 61 to the adsorption tower 41 via the gas line L21 and the branch lines L20 and L17.

[0058] As described above, in the second stage of the radioactive gas treatment method according to the present disclosure, adsorption tower 42 is first used for adsorption, and then adsorption tower 43 is used for adsorption. Meanwhile, when adsorption tower 42 is being used for adsorption, regeneration treatment of adsorption tower 44 is carried out. Also, adsorption tower 41 is used for restoring the pressure to normal.

[0059] (Third stage of radioactive gas treatment method) Next, the third stage of the radioactive gas processing method according to the present disclosure will be described with reference to Fig. 7. Fig. 7 is a diagram showing the third stage of the radioactive gas processing method according to the present disclosure. The third stage of the radioactive gas processing method according to the present disclosure will be described for each step shown in Fig. 7.

[0060] In the third stage of the radioactive gas treatment method, the gas to be treated treated in the fixed gas treatment device 200 has water vapor removed by the dehumidification tower 21, and then is introduced from the gas line L2 through the branch line L5 into the adsorption tower 43 (step S1). That is, in the third stage of the radioactive gas treatment method, first, the adsorption treatment of the radioactive rare gas contained in the gas to be treated is performed in the adsorption tower 43. The adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 43 is the same as the adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 41 in the first stage of the radioactive gas treatment method described above, and therefore a description thereof will be omitted.

[0061] Next, when the amount of radioactive rare gas adsorbed in the adsorption tower 43 reaches a predetermined amount or the pressure in the adsorption tower 43 reaches a predetermined pressure value, the adsorption tower 44 to which the gas to be treated is introduced is switched (step S2). That is, the adsorption unit 31 uses the adsorption tower 44 for adsorption after the adsorption tower 43. To this end, the control device 10 closes the on-off valves V3 and V15 on the branch lines L5 and L9 and opens the on-off valves V4 and V16 on the branch lines L6 and L10. The adsorption of the radioactive rare gas in the gas to be treated in the adsorption tower 43 is the same as the adsorption of the radioactive rare gas in the gas to be treated in the adsorption tower 41 in the first stage of the radioactive gas treatment method described above, and therefore will not be described again.

[0062] On the other hand, when the gas to be treated is introduced into the adsorption tower 43 and the radioactive rare gas is being adsorbed, if the radioactive rare gas is adsorbed in the adsorption tower 41, the adsorption tower 41 is regenerated (step S3). That is, the adsorption unit 31 uses the adsorption tower 41 for regeneration. To this end, the control device 10 opens the on-off valve V5 of the branch line L11 and keeps the on-off valves V6, V7, and V8 of the branch lines L12, L13, and L14 closed. Then, the vacuum pump 54 is driven. The desorption of the radioactive rare gas in the adsorption tower 41 by the vacuum pump 54 is the same as that in the adsorption tower 43 in the first stage of the radioactive gas treatment method described above, and therefore will not be described here.

[0063] Furthermore, after a predetermined time has elapsed since the start of regeneration treatment of the adsorption tower 41, the on-off valve V9 of the branch line L17 is opened and the supply pump 61 is driven. The regeneration treatment by the supply pump 61 in the adsorption tower 41 is the same as that in the adsorption tower 43 in the first stage of the radioactive gas treatment method described above, and therefore a description thereof will be omitted. When the regeneration treatment in the adsorption tower 41 is completed, the on-off valve V5 of the branch line L11 is closed and the vacuum pump 54 is stopped. Furthermore, the on-off valve V9 of the branch line L17 is closed and the supply pump 61 is stopped.

[0064] When the adsorption tower 43 is used for adsorption and the adsorption tower 41 is used for regeneration, the adsorption tower 42 is used for returning to normal pressure after the regeneration process is completed (step S4). That is, the on-off valve V10 of the branch line L18 is opened to supply the supply air from the supply pump 61 to the adsorption tower 42. That is, the air dried in the air treatment device 60 is supplied from the supply pump 61 to the adsorption tower 42 via the gas line L21 and the branch lines L18 and L8.

[0065] As described above, in the third stage of the radioactive gas treatment method according to the present disclosure, adsorption tower 43 is first used for adsorption, and then adsorption tower 44 is used for adsorption. Meanwhile, when adsorption tower 43 is being used for adsorption, regeneration treatment of adsorption tower 41 is carried out. Also, adsorption tower 42 is used for restoring the pressure to normal.

[0066] (Fourth stage of radioactive gas treatment method) Next, the fourth stage of the radioactive gas processing method according to the present disclosure will be described with reference to Fig. 8. Fig. 8 is a diagram showing the fourth stage of the gas processing method according to the present disclosure. The fourth stage of the radioactive gas processing method according to the present disclosure will be described for each step shown in Fig. 8.

[0067] In the fourth stage of the radioactive gas treatment method, the gas to be treated treated in the fixed gas treatment device 200 has water vapor removed by the dehumidification tower 21, and then is introduced from the gas line L2 through the branch line L6 into the adsorption tower 44 (step S1). That is, in the fourth stage of the radioactive gas treatment method, first, adsorption treatment of the radioactive rare gas is performed in the adsorption tower 44. The adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 44 is the same as the adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 41 in the first stage of the radioactive gas treatment method described above, and therefore a description thereof will be omitted.

[0068] Next, when the amount of radioactive rare gas adsorbed in the adsorption tower 44 reaches a predetermined amount or the pressure in the adsorption tower 44 reaches a predetermined pressure value, the destination of the gas to be treated from the gas line L2 is switched to the adsorption tower 41 (step S2). That is, the adsorption unit 31 uses the adsorption tower 41 for adsorption after the adsorption tower 44. To this end, the control device 10 closes the on-off valves V4 and V16 on the branch lines L6 and L10 and opens the on-off valves V1 and V13 on the branch lines L3 and L7. The adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 41 is the same as the adsorption of the radioactive rare gas contained in the gas to be treated in the adsorption tower 41 in the first stage of the radioactive gas treatment method described above, and therefore will not be described again.

[0069] On the other hand, when the gas to be treated is introduced into the adsorption tower 44 and the radioactive rare gas is being adsorbed, if the radioactive rare gas is adsorbed in the adsorption tower 42, the adsorption tower 42 is regenerated (step S3). That is, the adsorption unit 31 uses the adsorption tower 42 for regeneration. To this end, the control device 10 opens the on-off valve V6 of the branch line L12 and keeps the on-off valves V5, V7, and V8 of the branch lines L11, L13, and L14 closed. Then, the vacuum pump 54 is driven. The desorption of the radioactive rare gas in the adsorption tower 42 by the vacuum pump 54 is the same as that in the adsorption tower 43 in the first stage of the radioactive gas treatment method described above, and therefore will not be described again.

[0070] Furthermore, after a predetermined time has elapsed since the start of regeneration treatment of the adsorption tower 42, the on-off valve V10 of the branch line L18 is opened and the supply pump 61 is driven. The regeneration treatment by the supply pump 61 in the adsorption tower 42 is the same as that in the adsorption tower 43 in the first stage of the radioactive gas treatment method described above, and therefore a description thereof will be omitted. When the regeneration treatment in the adsorption tower 42 is completed, the on-off valve V6 of the branch line L12 is closed and the vacuum pump 54 is stopped. Furthermore, the on-off valve V10 of the branch line L18 is closed and the supply pump 61 is stopped.

[0071] When the adsorption tower 44 is used for adsorption and the adsorption tower 42 is used for regeneration, the adsorption tower 43 is used for returning to normal pressure after the regeneration process is completed (step S4). That is, the on-off valve V11 of the branch line L19 is opened to supply the supply air from the supply pump 61 to the adsorption tower 43. That is, the air dried in the air treatment device 60 is supplied from the supply pump 61 to the adsorption tower 43 via the gas line L21 and the branch lines L19 and L9.

[0072] As described above, in the fourth stage of the radioactive gas treatment method according to the present disclosure, adsorption tower 44 is first used for adsorption, and then adsorption tower 41 is used for adsorption. Meanwhile, when adsorption tower 44 is being used for adsorption, regeneration treatment of adsorption tower 42 is carried out. Also, adsorption tower 43 is used for restoring the pressure to normal.

[0073] This allows continuous processing by switching between adsorption towers that adsorb radioactive rare gases (one of the towers is always in the adsorption process). Also, in the unlikely event of a severe accident, if one of the adsorption towers is damaged, the remaining three towers can continue to operate. Furthermore, by storing desorbed gas with a high concentration of radioactive rare gases in a rare gas storage tank and returning a specified amount of it to the inlet, the radioactive rare gases can be concentrated to a high concentration.

[0074] (Control device configuration) Next, the configuration of the control device according to the present disclosure will be described with reference to Fig. 9. Fig. 9 is a diagram showing an example configuration of the control device of the portable gas processing device according to the present disclosure. As shown in Fig. 9, the control device 10 according to the present disclosure includes a communication unit 110, a storage unit 120, a control unit 130, an input unit 140, and a display unit 150. The configuration of these components will be described in order below.

[0075] The communication unit 110 is responsible for transmitting and receiving information to and from devices of the portable gas processing device 100. For example, the communication unit 110 is responsible for transmitting and receiving information to and from the on-off valves V5 to V16, the vacuum pump 54, the circulation pump 56, the supply pump 61, and the like. The communication unit 110 may be realized by, for example, a wireless LAN (Local Area Network) card, a serial communication interface device, an antenna, or the like. The communication unit 110 may also be realized by a HART (Highway Addressable Remote Transducer) communication modem, a Profibus DP (registered trademark) communication connector, or the like.

[0076] The storage unit 120 is a storage device that stores various information such as various measurement values ​​related to the portable gas processing device 100. The storage unit 120 includes a main storage device and an auxiliary storage device. The main storage device may be realized by a semiconductor memory element such as a random access memory (RAM), a read only memory (ROM), or a flash memory. The auxiliary storage device may be realized by a hard disk or a solid state drive (SSD), for example.

[0077] The control unit 130 is a controller that manages the control device 10. The control unit 130 is realized by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like executing various programs stored in the storage unit 120 using RAM as a work area. The control unit 130 may also be realized by an integrated circuit, such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0078] As shown in FIG. 9, the control unit 130 includes an acquisition unit 131, a reception unit 132, an operation unit 133, and an output unit 134. The control unit 130 realizes these functions and executes these processes by reading and executing a program (software) from the storage unit 120. Note that these functions of the control unit 130 may be realized by electronic circuits. Furthermore, the control unit 130 may execute these processes using one CPU, or may be provided with multiple CPUs that execute these processes in parallel. Below, these components will be described in order.

[0079] The acquisition unit 131 acquires various measurement values ​​related to the adsorption / desorption unit 30 of the portable gas processing device 100. For example, the acquisition unit 131 acquires measurement values ​​of pressure gauges provided in the adsorption towers 41, 42, 43, and 44 of the adsorption / desorption unit 30. The acquisition unit 131 may also acquire measurement values ​​related to the operating states (e.g., rotation speeds) of the vacuum pump 54, the circulation pump 56, and the supply pump 61 of the adsorption / desorption unit 30.

[0080] The receiving unit 132 receives various types of operation information from the operation manager of the portable gas processing device 100 or the like. Specifically, the receiving unit 132 receives the operation information from the operation manager or the like via the input unit 140. The content of the operation information may be information related to opening or closing an on-off valve or information related to operating or stopping a vacuum pump. In other words, the operation content of the input unit 140 and the control content may be stored in association with each other in the memory unit 120.

[0081] The operation unit 133 generates operation signals for the on-off valves V5 to V16, the vacuum pump 54, the circulation pump 56, and the supply pump 61. Specifically, the operation unit 133 generates operation signals for the on-off valves V5 to V16 when the pressure in the adsorption chamber reaches a predetermined value or when the radioactive noble gas concentration reaches a predetermined value. That is, the operation unit 133 may be implemented with a program that realizes the radioactive gas treatment method described above. Furthermore, the operation unit 133 may generate operation signals for the on-off valves V5 to V16, the vacuum pump 54, the circulation pump 56, and the supply pump 61 based on operation information received by the reception unit 132.

[0082] The output unit 134 transmits operation signals to the on-off valves V5 to V16, the vacuum pump 54, the circulation pump 56, and the supply pump 61. Specifically, the output unit 134 transmits operation signals to the on-off valves V5 to V16, the vacuum pump 54, the circulation pump 56, and the supply pump 61 via the communication unit 110. This allows the control device 10 to operate the on-off valves V5 to V16, the vacuum pump 54, the circulation pump 56, and the supply pump 61.

[0083] The input unit 140 receives various types of operation information from an operation manager or the like. The input unit 140 may be realized by an input device such as a keyboard, a mouse, a lever, or a switch. The operation manager inputs, via the input unit 140, operation information for operating various devices of the portable gas processing device 100, operation information for displaying a GUI (Graphical User Interface) showing various types of information related to the portable gas processing device 100, and the like.

[0084] The display unit 150 is a display device that displays various types of information. For example, the display unit 150 may display pressure measurement values, radioactive rare gas concentrations, etc. related to the portable gas processing device 100 in a time-series graph. The display unit 150 may be realized by, for example, a liquid crystal display, an organic EL (Electro Luminescence) display, a micro LED (Light Emitting Diode) display, etc.

[0085] (Hardware configuration) The control device 10 according to the above-described embodiment is realized, for example, by a computer 1000 configured as shown in Fig. 10. Fig. 10 is a hardware configuration diagram showing an example of a computer that realizes the functions of the control device according to the present disclosure. The computer 1000 is connected to an output device 1010 and an input device 1020, and has a configuration in which a calculation device 1030, a primary storage device 1040, a secondary storage device 1050, an output IF (Interface) 1060, an input IF 1070, and a network IF 1080 are connected via a bus 1090.

[0086] The arithmetic device 1030 operates based on programs stored in the primary storage device 1040 and secondary storage device 1050, programs read from the input device 1020, and the like, and executes various processes. The primary storage device 1040 is a memory device, such as a RAM, that temporarily stores data used by the arithmetic device 1030 for various calculations. The secondary storage device 1050 is a storage device that stores data used by the arithmetic device 1030 for various calculations and various databases, and is realized by a ROM, HDD, flash memory, or the like.

[0087] The output IF 1060 is an interface for transmitting information to be output to an output device 1010 that outputs various types of information, such as a monitor or a printer, and is realized by a connector conforming to a standard such as USB (Universal Serial Bus), DVI (Digital Visual Interface), or HDMI (High Definition Multimedia Interface), etc. The input IF 1070 is an interface for receiving information from various input devices 1020, such as a mouse, keyboard, scanner, etc., and is realized by a USB, etc.

[0088] The input device 1020 may be a device that reads information from, for example, an optical recording medium such as a CD (Compact Disc), a DVD (Digital Versatile Disc), or a PD (Phase Change Rewritable Disk), a magneto-optical recording medium such as an MO (Magneto-Optical disk), a tape medium, a magnetic recording medium, or a semiconductor memory. The input device 1020 may also be an external storage medium such as a USB memory.

[0089] The network IF 1080 receives data from other devices via the network N and sends it to the arithmetic device 1030, and also transmits data generated by the arithmetic device 1030 to other devices via the network N.

[0090] The arithmetic unit 1030 controls the output device 1010 and the input device 1020 via the output IF 1060 and the input IF 1070. For example, the arithmetic unit 1030 loads a program from the input device 1020 or the secondary storage device 1050 onto the primary storage device 1040 and executes the loaded program.

[0091] For example, when the computer 1000 functions as the control device 10, the arithmetic unit 1030 of the computer 1000 realizes the functions of the control unit 130 of the control device 10 by executing a program loaded onto the primary storage device 1040.

[0092] (Composition and Effects) The radioactive gas treatment system 1 according to the first embodiment comprises a fixed gas treatment device 200 that is provided in a gas line through which waste gas containing radioactive noble gases discharged from a nuclear reactor 300 flows and that adsorbs the radioactive noble gases contained in the waste gas, and a portable gas treatment device 100 that has a supply line through which gas to be treated containing the radioactive noble gases adsorbed by the fixed gas treatment device 200 is supplied and an adsorption unit connected to the supply line and that can be moved to the nuclear reactor.

[0093] According to this configuration, when an event such as a fuel leak occurs, even if the amount of waste gas exceeds the amount that can be treated by the fixed gas treatment device 200, the waste gas can be treated by the portable gas treatment device 100. Therefore, it is possible to provide a radioactive gas treatment system 1 that can treat waste gas appropriately.

[0094] The radioactive gas treatment system 1 according to the second embodiment is the radioactive gas treatment system 1 according to the first embodiment, in which the supply line is detachably connected to the fixed gas treatment device.

[0095] According to this configuration, the portable gas treatment device 100 can be connected to the fixed gas treatment device 200 to treat the waste gas only when an event such as a fuel leak occurs and the concentration of waste gas inside the containment vessel 311 increases. Therefore, it is possible to provide a radioactive gas treatment system 1 that can treat waste gas appropriately.

[0096] The radioactive gas treatment system 1 according to the third aspect is the radioactive gas treatment system 1 according to the first or second aspect, and the portable gas treatment device 100 has an exhaust line L22 that discharges the gas to be treated that has passed through the adsorption tower section to the outside.

[0097] According to this configuration, it is possible to provide a radioactive gas treatment system 1 that can recover radioactive rare gas and discharge components that can be discharged to the outside, thereby reducing the volume of the gas to be treated.

[0098] The radioactive gas processing system 1 according to the fourth aspect is a radioactive gas processing system 1 according to any one of the first to third aspects, and the portable gas processing device 100 comprises a concentration section 32 that desorbs and concentrates the radioactive rare gas adsorbed in the adsorption section 31, and a storage section 33 that stores the radioactive rare gas concentrated in the concentration section 32.

[0099] According to this configuration, the radioactive rare gas contained in the waste gas can be adsorbed and desorbed and stored in the portable gas treatment device 100. Therefore, it is possible to provide a radioactive gas treatment system 1 that can appropriately treat the waste gas.

[0100] The radioactive gas treatment system 1 according to the fifth aspect is the radioactive gas treatment system 1 according to any one of the first to fourth aspects, in which the adsorption section 31 has a plurality of adsorption towers 41, 42, 43, 44 arranged in parallel on the gas line, and inlet switching valves V1, V2, V3, V4 that switch the introduction of the gas to be treated into the plurality of adsorption towers 41, 42, 43, 44, and the concentration section 32 has a concentration line that desorbs the radioactive rare gas adsorbed by the plurality of adsorption towers 41, 42, 43, 44 and supplies it to the storage section 33 for concentration, and desorption switching valves V5, V6, V7, V8 that switch the desorption of the radioactive rare gas from the plurality of adsorption towers 41, 42, 43, 44.

[0101] According to this configuration, the adsorption towers 41, 42, 43, and 44 that adsorb and desorb radioactive rare gases contained in waste gas can be switched and used. Therefore, even if the adsorption amount of radioactive rare gases in one of the adsorption towers 41, 42, 43, and 44 reaches its limit, the radioactive rare gases can be continuously adsorbed and desorbed by using the other adsorption towers 41, 42, 43, and 44. Therefore, it is possible to provide a radioactive gas treatment system 1 that can appropriately treat waste gas.

[0102] The radioactive gas treatment system 1 according to the sixth aspect is the radioactive gas treatment system 1 according to the fifth aspect, and the portable gas treatment device 100 has an input unit 140 that receives operation instructions from an operator, and a control device 10 that controls the opening and closing of the inlet switching valves V1, V2, V3, and V4 based on operation signals from the input unit.

[0103] According to this configuration, the portable gas treatment device 100 can be appropriately controlled based on the operation instructions of the operator, and therefore, a radioactive gas treatment system 1 that can appropriately treat waste gas can be provided.

[0104] The radioactive gas treatment system 1 according to the seventh aspect is the radioactive gas treatment system 1 according to the fourth or fifth aspect, and the concentration section 32 has a suction force applying section 54 provided in the concentration line to apply suction force to the inlet side of the plurality of adsorption towers 41, 42, 43, and 44.

[0105] According to this configuration, after the radioactive rare gas has been adsorbed, the radioactive rare gas can be appropriately desorbed from the adsorption towers 41, 42, 43, and 44. Therefore, it is possible to provide a radioactive gas treatment system 1 that can appropriately treat waste gas.

[0106] A radioactive gas treatment method according to an eighth aspect includes the steps of adsorbing the radioactive rare gas contained in the waste gas using a fixed gas treatment device provided in a gas line through which waste gas containing the radioactive rare gas discharged from a nuclear reactor flows; connecting a portable gas treatment device that can be moved to the nuclear reactor to the fixed gas treatment device; supplying the gas to be treated, which contains the radioactive rare gas adsorbed by the fixed gas treatment device, to the portable gas treatment device and adsorbing the radioactive rare gas in an adsorption section of the portable gas treatment device; and detaching the portable gas treatment device from the fixed gas treatment device.

[0107] According to this configuration, it is possible to provide a radioactive gas treatment method that can appropriately treat waste gas.

[0108] The portable gas treatment device according to the ninth aspect is a portable gas treatment device that recovers radioactive rare gases discharged from a nuclear reactor, and is detachable from a fixed gas treatment device. The portable gas treatment device is equipped with a supply line through which a gas to be treated containing a radioactive rare gas adsorbed by the fixed gas treatment device that adsorbs the radioactive rare gases is supplied, an adsorption unit connected to the supply line, an exhaust line that discharges the gas to be treated that has passed through the adsorption unit to the outside, and a drive mechanism that can be moved relative to the nuclear reactor.

[0109] With this configuration, the equipment can be placed in relation to the nuclear reactor only when processing is required, and can be shared among multiple nuclear facilities. When not in use, the equipment can be kept on standby in another location.

[0110] Although the embodiments of the present disclosure have been described above, the embodiments are not limited to the contents of these embodiments. Furthermore, the above-described components include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-described components can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the above-described embodiments. [Explanation of symbols]

[0111] 1. Radioactive gas treatment system 10 Control device 21 Dehumidification tower 30 Adsorption / desorption section 31 Adsorption part 32 Concentration section 33 Storage section 41,42,43,44 Adsorption tower 51,61 Supply pump 54 Vacuum pump (suction force applying part) 55 Gas Tank 56 Circulation Pump 60 Air Treatment Device 100 Portable gas treatment device 110 Communications Department 120 Storage section 130 Control Unit 131 Acquisition Department 132 Reception Department 133 Operation section 134 Output section 140 Input section 150 Display section 200 Fixed gas treatment equipment 211 Primary coolant piping 212 Volume control tank 214 Extraction tube 215 Filling Line 216,218 Pipeline 217 Hydrogen Recombiner 219 Charcoal Head 220 Discharge pipe 300 reactor 311 Containment Vessel 312 Pressure vessels 313 Steam Generator 314 High temperature side feed piping 315 Low temperature side feed piping 316 Pressurizer 317 Primary cooling water pump 400 Chimney 1000 computers 1010 Output Device 1020 Input Device 1030 Arithmetic equipment 1040 Primary storage 1050 Secondary storage 1060 Output IF (Interface) 1070 Input IF 1080 Network Interface 1090 Bus L1, L2, L15, L21, L22 gas lines L3, L4, L5, L6, L7, L8, L9, L10, L17, L18, L19, L20 branch lines L11, L12, L13, L14 branch lines (concentration lines) L16 Circulation Line N Network V1, V2, V3, V4 on-off valves (inlet switching valves) V5, V6, V7, V8 on-off valves (desorption switching valves) V9, V10, V11, V12, V13, V14, V15, V16 shut-off valves

Claims

1. a fixed gas treatment device that is provided in a gas line through which waste gas containing radioactive rare gases discharged from a nuclear reactor flows and that adsorbs the radioactive rare gases contained in the waste gas; a portable gas treatment device that has a supply line through which a gas to be treated containing a radioactive rare gas adsorbed by the fixed gas treatment device is supplied and an adsorption unit connected to the supply line, and that can be moved to the nuclear reactor; Radioactive gas disposal system.

2. The supply line is detachably connected to the fixed gas treatment device.

10. The radioactive gas treatment system of claim 1.

3. The portable gas treatment device has an exhaust line for exhausting the gas to be treated that has passed through the adsorption unit to the outside.

10. The radioactive gas treatment system of claim 1.

4. The portable gas treatment device comprises: a concentrating section that desorbs and concentrates the radioactive rare gas adsorbed in the adsorption section; a storage section for storing the radioactive rare gas concentrated in the concentration section, 10. The radioactive gas treatment system of claim 1.

5. the adsorption unit includes a plurality of adsorption towers provided in parallel on the supply line, and an inlet switching valve that switches the introduction of the target gas into the plurality of adsorption towers; The concentration unit includes a concentration line that desorbs the radioactive rare gas adsorbed by the plurality of adsorption towers and supplies the desorbed radioactive rare gas to the storage unit for concentration, and a desorption switching valve that switches the desorption of the radioactive rare gas from the plurality of adsorption towers.

5. The radioactive gas treatment system of claim 4.

6. The portable gas treatment device comprises: an input unit that receives operation instructions from an operator; a control device that opens and closes the introduction switching valve in response to an operation signal from an input unit.

6. The radioactive gas treatment system of claim 5.

7. the concentration section includes a suction force applying section provided in the concentration line and configured to apply a suction force to an inlet side of each of the plurality of adsorption towers.

6. The radioactive gas treatment system of claim 5.

8. adsorbing the radioactive rare gas contained in the waste gas by a fixed gas treatment device provided in a gas line through which waste gas containing the radioactive rare gas discharged from the nuclear reactor flows; connecting a portable gas treatment device to the fixed gas treatment device, the portable gas treatment device being movable relative to the reactor; supplying the gas to be treated, which contains the radioactive rare gas adsorbed by the fixed gas treatment device, to the portable gas treatment device, and adsorbing the radioactive rare gas in an adsorption unit of the portable gas treatment device; and detaching the portable gas treatment device from the fixed gas treatment device. Radioactive gas treatment method.

9. A portable gas treatment device for recovering radioactive rare gases discharged from a nuclear reactor, a supply line that is detachable from the fixed gas treatment device and through which a gas to be treated containing a radioactive rare gas adsorbed by the fixed gas treatment device that adsorbs the radioactive rare gas is supplied; an adsorption unit connected to the supply line; an exhaust line for exhausting the gas to be treated that has passed through the adsorption section to the outside; a drive mechanism movable relative to the reactor. Portable gas treatment equipment.

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