Vent system
By introducing rare gas filters and adsorbents into the exhaust system of the nuclear reactor container tank, the problem of reducing the concentration of precious gas in the prior art is solved, and effective suppression of precious gases and optimization of the number of system equipment is achieved.
Patent Information
- Application Number
- JP2023178581
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-10-17
- Publication Date
- 2025-04-30
AI Technical Summary
The prior art prevents the nuclear reactor container tank from releasing precious gases, making it difficult to effectively reduce the concentration of precious gases, resulting in leakage of precious gases through the container tank as the main release path, affecting the maximization effect of the precious gas filtration system.
An exhaust system containing a rare gas filter and an adsorbent is used, which separates water vapor and hydrogen from the rare gas and nitrogen through a rare gas filter and uses the adsorbent to absorb the rare gas, thereby reducing the return amount of the rare gas and releasing nitrogen through the exhaust pipe.
It effectively inhibits the atmospheric release of precious gases, reduces the amount of release caused by precious gas leakage, and avoids the increase in the number of equipment in the system, achieving an effective reduction of precious gas concentration.
Smart Images
Figure 2025068655000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a vent system for a nuclear reactor containment vessel. [Background technology]
[0002] Patent Document 1 describes a vent system that includes a vent line that forms a flow path from the gas phase of the wet well to the external environment, a rare gas filter installed on the vent line through which the volumetric flow rate of the rare gas is smaller than that of water vapor and hydrogen gas, and a return line that forms a flow path connected to the upstream portion of the rare gas filter on the vent line and the gas phase of the wet well. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] JP 2022-51390 A Summary of the Invention [Problem to be solved by the invention]
[0004] In current domestic nuclear power plants, a filter vent system is installed to release gas from the containment vessel as one of the measures to prevent overpressure damage and hydrogen explosions in the reactor containment vessel in the event of a severe accident. However, it is difficult to remove radioactive rare gases using a filter vent. Therefore, methods for removing rare gases have been considered. For example, there is a technology described in Patent Document 1.
[0005] Patent Document 1 states that "According to the present invention, by installing a rare gas filter on the vent line, it is possible to release water vapor and hydrogen gas from the gas (vent gas) discharged from the reactor containment vessel to the external environment, and to minimize the release of radioactive rare gases into the external environment via the vent line."
[0006] In Patent Document 1, a rare gas filter, which is a membrane filter that blocks radioactive rare gases and nitrogen and allows hydrogen and water vapor to pass through, is used to release only hydrogen and water vapor and return the radioactive rare gases and nitrogen to the reactor containment vessel.
[0007] However, in Patent Document 1, the rare gas is returned to the reactor containment vessel without being removed, so the rare gas concentration in the system does not decrease. Therefore, it is considered that leakage from the reactor containment vessel becomes the main route for the release of rare gas, and the effect of the rare gas filter cannot be maximized.
[0008] The present invention provides a vent system for a reactor containment vessel that can suppress the release of rare gases into the atmosphere using the vent system and also suppress an increase in the amount of equipment required due to the addition of the vent system. [Means for solving the problem]
[0009] The present invention includes a number of means for solving the above problems. One example is a vent system for discharging gas from a reactor containment vessel, comprising: a main line connected to the reactor containment vessel; a rare gas filter provided on the main line for separating hydrogen and water vapor from a rare gas and nitrogen; a plurality of adsorbents provided in parallel on the main line; and a vent line provided downstream of the adsorbents for releasing the nitrogen into the atmosphere.
[0010] As another example, a vent system for discharging gas from a reactor containment vessel includes a main line connected to the reactor containment vessel, a rare gas filter provided on the main line for separating hydrogen and water vapor from rare gas and nitrogen, an adsorbent provided on the main line, and a vent line provided downstream of the adsorbent for releasing the nitrogen into the atmosphere. Effect of the Invention
[0011] According to the present invention, it is possible to suppress the release of rare gases into the atmosphere using a reactor vent system, and to suppress an increase in the amount of equipment required due to the addition of a vent system. Other problems, configurations, and effects will become apparent from the following description of the embodiments. [Brief description of the drawings]
[0012] [Figure 1] FIG. 1 is a diagram showing an outline of a vent system according to a first embodiment. [Diagram 2] FIG. 2 is a diagram showing an overview of the manner in which a rare gas is adsorbed by an adsorbent on one side and a radioactive rare gas is separated from another adsorbent on the other side in the vent system of Example 1. [Diagram 3] FIG. 2 is a diagram showing an overview of the manner in which a rare gas is adsorbed by an adsorbent on one side and a radioactive rare gas is separated from another adsorbent on the other side in the vent system of Example 1. [Figure 4] FIG. 13 is a diagram showing an overview of a vent system of a second embodiment and a state during venting. [Diagram 5] FIG. 13 is a diagram showing an overview of separation of a radioactive rare gas from an adsorbent in the vent system of Example 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0013] Hereinafter, an embodiment of the vent system of the present invention will be described with reference to the drawings. In the drawings used in this specification, the same or similar reference numerals are used to designate the same or corresponding components, and repeated description of these components may be omitted.
[0014] <Example 1> A first embodiment of the vent system of the present invention will be described with reference to Figs. 1 to 3.
[0015] First, the overall configuration of the vent system 1 will be described with reference to Fig. 1. Fig. 1 is a diagram showing an overview of the vent system of the first embodiment.
[0016] The vent system 1 shown in FIG. 1 is a system for discharging a mixed gas consisting of radioactive rare gases, nitrogen, water vapor, hydrogen, etc. from a reactor containment vessel 5, and is equipped with a rare gas filter 11, a cooler 13, adsorbents 15a, 15b, a storage tank 17, a main pipe 21, a filter exhaust pipe 23, a small diameter bypass pipe 25, a main exhaust pipe 27, a storage tank pipe 29, main pipe valves 31a, 31b, bypass pipe valves 33a, 33b, first main exhaust pipe valves 35a, 35b, storage tank pipe valves 37a, 37b, a second main exhaust valve 39, etc.
[0017] The main pipe 21 is a line (pipe) that connects the reactor containment vessel 5 and the plurality of adsorbents 15a, 15b.
[0018] The rare gas filter 11 is provided on the main pipe 21 and separates hydrogen and water vapor from radioactive rare gas and nitrogen. The water vapor and hydrogen separated by the rare gas filter 11 are released into the atmosphere via a filter exhaust pipe 23.
[0019] On the other hand, the radioactive rare gas and nitrogen separated from the mixed gas flow to the adsorbents 15a, 15b through the main pipe 21 and a small diameter bypass pipe 25 branching off from the main pipe 21 at the rear stage of the rare gas filter 11. The small diameter bypass pipe 25 is a pipe having a smaller diameter than the main pipe 21.
[0020] The cooler 13 is provided in the main pipe 21 after the branch point with the small diameter bypass pipe 25, and is a device that cools the radioactive rare gas and nitrogen to a temperature at which the performance of the adsorbents 15a and 15b can be ensured.
[0021] The main pipe valve 31a is provided in a portion of the main pipe 21 that branches off toward the adsorbent 15a downstream of the cooler 13, and the main pipe valve 31b is provided in a portion of the main pipe 21 that branches off toward the adsorbent 15b.
[0022] The bypass piping valve 33a is provided in a portion of the small diameter bypass piping 25 that branches off toward the adsorbent 15a, and the bypass piping valve 33b is provided in a portion of the small diameter bypass piping 25 that branches off toward the adsorbent 15b.
[0023] The adsorbents 15a and 15b in this embodiment are portions that adsorb only the radioactive rare gas from the radioactive rare gas and nitrogen cooled by the cooler 13, and are installed in parallel on the main pipe 21. The adsorbents 15a and 15b may have the same specifications or different specifications, and are not particularly limited. In addition, although a form in which two adsorbents 15a and 15b are provided is shown, three or more adsorbents may be provided in parallel, and are not particularly limited.
[0024] The main exhaust pipe 27 is disposed downstream of the adsorbents 15a and 15b, and is a line (piping) for releasing nitrogen into the atmosphere.
[0025] The first main exhaust pipe valve 35a is provided in a front-stage portion of the main exhaust pipe 27 where it joins from the adsorbent 15a side, and the first main exhaust pipe valve 35b is provided in a front-stage portion of the main exhaust pipe 27 where it joins from the adsorbent 15b side.
[0026] The storage tank 17 is a section for storing the nitrogen that is passed in order to separate the radioactive rare gas adsorbed in the adsorbents 15a, 15b from the adsorbents 15a, 15b, and the radioactive rare gas separated from the adsorbents 15a, 15b by the nitrogen.
[0027] The storage tank pipe 29 is a line (piping) that branches off from the main exhaust pipe 27 and connects the storage tank 17 with the adsorbents 15a and 15b.
[0028] The storage tank pipe valve 37a is provided in a front portion of the storage tank pipe 29 branching off from the main exhaust pipe 27, where it joins from the adsorbent 15a side, and the storage tank pipe valve 37b is provided in a front portion of the storage tank pipe 29 branching off from the main exhaust pipe 27, where it joins from the adsorbent 15b side.
[0029] Next, the state during filter venting in the vent system 1 of this embodiment will be described with reference to Figures 2 and 3. Figures 2 and 3 are diagrams showing an overview of the state in the vent system 1 of Example 1 in which the radioactive rare gas is adsorbed by an adsorbent on one side and the radioactive rare gas is separated from the other adsorbent on the other side.
[0030] In the vent system 1 of this embodiment, it is possible to continue filter venting and separate the radioactive rare gas from the adsorbents 15a and 15b in parallel by switching between opening and closing the main piping valves 31a, 31b, the bypass piping valves 33a, 33b, the first main exhaust pipe valves 35a, 35b, and the storage tank pipe valves 37a, 37b.
[0031] When the adsorbents 15a, 15b are used for a long period of time, it is conceivable that their adsorption performance will decrease. Therefore, by switching the main piping valves 31a, 31b, the bypass piping valves 33a, 33b, the first main exhaust pipe valves 35a, 35b, and the storage tank pipe valves 37a, 37b between open and closed at regular intervals, it is possible to flow the cooled radioactive rare gas and nitrogen into the other adsorbent 15a, 15b.
[0032] In addition, high-temperature radioactive rare gas and nitrogen are passed through small-diameter bypass piping 25 to the adsorbents 15a and 15b with reduced adsorption performance, thereby increasing the temperature of the adsorbents 15a and 15b and separating the radioactive rare gas. The separated mixture of radioactive rare gas and nitrogen is stored in a downstream storage tank 17, making it possible to prevent the radioactive rare gas from being released into the atmosphere. In addition, since venting can be continued through the other line, a certain amount of nitrogen is released into the atmosphere, so the amount of the mixture of radioactive rare gas and nitrogen stored in the storage tank 17 can be reduced, making it possible to reduce the volume of the storage tank 17.
[0033] In FIG. 2, when a mixture of radioactive rare gases, nitrogen, water vapor, hydrogen, etc. in the reactor containment vessel 5 flows into the vent system 1, it is first separated into hydrogen and water vapor and radioactive rare gases and nitrogen by the rare gas filter 11, and the water vapor and hydrogen are released into the atmosphere via the filter exhaust pipe 23.
[0034] Most of the high-temperature radioactive rare gas and nitrogen separated from the mixed gas flows into the cooler 13 via the main pipe 21 and is cooled. Then, because the main pipe valve 31a is open and the main pipe valve 31b and the bypass pipe valve 33a are closed, the cooled radioactive rare gas and nitrogen flow into the adsorbent 15a, and the radioactive rare gas is adsorbed by the adsorbent 15a.
[0035] After that, the radioactive rare gas is adsorbed, leaving only nitrogen, and the first main exhaust pipe valve 35a and the second main exhaust valve 39 are opened, while the first main exhaust pipe valve 35b and the storage tank pipe valve 37a are closed, so that the nitrogen is released into the atmosphere through the main exhaust pipe 27.
[0036] In addition, because the main pipe valve 31b and the bypass pipe valve 33a are closed and the bypass pipe valve 33b is open, a portion of the high-temperature radioactive rare gas and nitrogen separated from the mixed gas flows as high-temperature radioactive rare gas and nitrogen through the small-diameter bypass pipe 25 to the adsorbent 15b, and the radioactive rare gas adsorbed to the adsorbent 15b is separated from the adsorbent 15b.
[0037] The high-temperature radioactive rare gas and nitrogen, including the high-temperature radioactive rare gas that was adsorbed in the adsorbent 15b, flow into the storage tank 17 via the storage tank pipe 29 and are stored there, because the first main exhaust pipe valve 35b and the storage tank pipe valve 37a are closed and the storage tank pipe valve 37b is open.
[0038] After performing filter venting for a certain period of time in the state shown in FIG. 2, the main pipe valves 31a, 31b, the bypass pipe valves 33a, 33b, the first main exhaust pipe valves 35a, 35b, and the storage tank pipe valves 37a, 37b are switched between open and closed to achieve the state shown in FIG.
[0039] In FIG. 3, when a mixed gas consisting of radioactive rare gas, nitrogen, water vapor, hydrogen, etc. in the reactor containment vessel 5 flows into the vent system 1, it is first separated into hydrogen and water vapor and radioactive rare gas and nitrogen by the rare gas filter 11, and the water vapor and hydrogen are released into the atmosphere via the filter exhaust pipe 23, which is the same as in the previous example.
[0040] Most of the high-temperature radioactive rare gas and nitrogen separated from the mixed gas flows into the cooler 13 via the main pipe 21 and is cooled. Then, because the main pipe valve 31b is opened and the main pipe valve 31a and the bypass pipe valve 33b are closed, the cooled radioactive rare gas and nitrogen flow into the adsorbent 15b, and the radioactive rare gas is adsorbed by the adsorbent 15b.
[0041] After that, the radioactive rare gas is adsorbed, leaving only nitrogen, and the first main exhaust pipe valve 35b and the second main exhaust valve 39 are opened, while the first main exhaust pipe valve 35a and the storage tank pipe valve 37b are closed, so that the nitrogen is released into the atmosphere through the main exhaust pipe 27.
[0042] In addition, because the main pipe valve 31a and the bypass pipe valve 33b are closed and the bypass pipe valve 33a is open, a portion of the high-temperature radioactive rare gas and nitrogen separated from the mixed gas flows as high-temperature radioactive rare gas and nitrogen through the small-diameter bypass pipe 25 to the adsorbent 15a, and the radioactive rare gas adsorbed to the adsorbent 15a is separated from the adsorbent 15a.
[0043] The high-temperature radioactive rare gas and nitrogen, including the high-temperature radioactive rare gas that was adsorbed by the adsorbent 15a, flow into the storage tank 17 via the storage tank pipe 29 and are stored there, because the first main exhaust pipe valve 35a and the storage tank pipe valve 37b are closed and the storage tank pipe valve 37a is open.
[0044] After performing filter venting for a certain period of time in the state of Fig. 3, the main pipe valves 31a, 31b, the bypass pipe valves 33a, 33b, the first main exhaust pipe valves 35a, 35b, and the storage tank pipe valves 37a, 37b are switched between open and closed to return to the state of Fig. 2. This switching is performed appropriately. This switching may be automatic or manual by an operator, and is not particularly limited.
[0045] Next, the effects of this embodiment will be described.
[0046] The vent system 1 for discharging gas from the reactor containment vessel 5 in the above-mentioned first embodiment of the present invention includes a main pipe 21 connected to the reactor containment vessel 5, a rare gas filter 11 provided on the main pipe 21 for separating hydrogen and water vapor from radioactive rare gas and nitrogen, adsorbents 15a, 15b provided in parallel on the main pipe 21, and a main exhaust pipe 27 provided downstream of the adsorbents 15a, 15b for releasing nitrogen into the atmosphere.
[0047] As a result, the radioactive rare gas is separated using the rare gas filter 11 capable of selectively removing the radioactive rare gas, and the separated radioactive rare gas is adsorbed by the adsorbents 15a and 15b, so that the total amount of rare gas returned to the reactor containment vessel 5 can be significantly reduced, and the release of radioactive rare gas due to leakage from the reactor containment vessel 5 can be suppressed. In addition, by further separating the nitrogen and radioactive rare gas separated from the water vapor by the rare gas filter 11 using the adsorbents 15a and 15b, it is possible to release the nitrogen into the atmosphere, and the tank capacity can be reduced, so that the overall amount of material can be reduced. In addition, since the adsorbents 15a and 15b can be regenerated, there is also an effect that the filter vent can be continued for a long period of time.
[0048] In addition, the system further includes a small diameter bypass pipe 25 for passing radioactive rare gas and nitrogen, which branches off from the main pipe 21 downstream of the rare gas filter 11, and a cooler 13 provided on the main pipe 21 downstream of the branch point with the small diameter bypass pipe 25. This makes it possible to cool the radioactive rare gas and nitrogen to a temperature at which the performance of the adsorbents 15a, 15b can be ensured, and the adsorption, i.e., removal efficiency, of the radioactive rare gas can be further improved.
[0049] Furthermore, by further providing nitrogen that is flowed to separate the radioactive rare gas adsorbed by the adsorbents 15a, 15b from the adsorbents 15a, 15b, and a storage tank 17 that stores the radioactive rare gas separated from the adsorbents 15a, 15b by the nitrogen, and a storage tank pipe 29 that branches off from the main exhaust pipe 27 and is connected to the storage tank 17, the amount of radioactive rare gas released into the atmosphere can be further reduced.
[0050] In addition, a plurality of main pipe valves 31a, 31b are provided in the main pipe 21 at a portion branching toward the plurality of adsorbents 15a, 15b in the rear stage of the cooler 13, a plurality of bypass pipe valves 33a, 33b are provided in the small-diameter bypass pipe 25 at a portion branching toward the plurality of adsorbents 15a, 15b, a plurality of first main exhaust pipe valves 35a, 35b are provided in the main exhaust pipe 27 at a front stage portion where the plurality of adsorbents 15a, 15b join, and a plurality of second main exhaust pipe valves 35a, 35b are provided in the storage tank pipe 29 at a front stage portion where the plurality of adsorbents 15a, 15b join. The adsorbent 15a, 15b is further provided with a plurality of storage tank pipe valves 37a, 37b provided at the front stage where the adsorbents 15a, 15b join, and by switching the opening and closing of the main pipe valves 31a, 31b, the bypass pipe valves 33a, 33b, the first main exhaust pipe valves 35a, 35b, and the storage tank pipe valves 37a, 37b, the filter vent and the separation of the radioactive rare gas from the adsorbents 15a, 15b are performed in parallel, so that the adsorption and separation of the radioactive rare gas can be selectively performed in parallel. In addition, the adsorbents 15a, 15b can be separated by flowing a small amount of vent gas into the small diameter bypass pipe 25, so that the storage tank 17 that stores the separated radioactive rare gas stores the radioactive rare gas and a small amount of nitrogen, making it possible to reduce the tank volume.
[0051] <Example 2> The vent system of the second embodiment of the present invention will be described with reference to Figures 4 and 5. Figure 4 is a diagram showing an overview of the vent system of the second embodiment and a state during venting, and Figure 5 is a diagram showing an overview of the state in which radioactive rare gases are separated from an adsorbent in the vent system of the second embodiment.
[0052] The vent system 1A of this embodiment shown in Figures 4 and 5 is a system for discharging a mixed gas consisting of a radioactive rare gas, nitrogen, water vapor, hydrogen, etc. from a reactor containment vessel 5, similar to the vent system 1 of Example 1, and includes a rare gas filter 11, a cooler 13, an adsorbent 15, a storage tank 17, a main piping 21A, a filter exhaust pipe 23, a small diameter bypass piping 25A, a main exhaust pipe 27A, a storage tank pipe 29A, a main piping valve 31, a bypass piping valve 33, a main exhaust pipe valve 35, a storage tank pipe valve 37, etc.
[0053] The main pipe 21A is a line (pipe) that connects the reactor containment vessel 5 and the adsorbent 15.
[0054] The rare gas filter 11 is provided on the main pipe 21A and separates hydrogen and water vapor from radioactive rare gas and nitrogen. The water vapor and hydrogen separated by the rare gas filter 11 are released into the atmosphere via the filter exhaust pipe 23.
[0055] On the other hand, the radioactive rare gas and nitrogen separated from the mixed gas flow to the adsorbent 15 through the main pipe 21A or a small diameter bypass pipe 25A branching off from the main pipe 21A at the rear stage of the rare gas filter 11. The small diameter bypass pipe 25A is a pipe having a smaller diameter than the main pipe 21A.
[0056] The cooler 13 is provided in the main pipe 21A after the branch point with the small diameter bypass pipe 25A, and is a device that cools the radioactive rare gas and nitrogen to a temperature at which the performance of the adsorbent 15 can be ensured.
[0057] The main pipe valve 31 is provided in the main pipe 21A at a rear stage of the cooler 13. However, it may be provided at a front stage of the cooler 13.
[0058] The bypass pipe valve 33 is provided in the small diameter bypass pipe 25A.
[0059] The difference between this embodiment and the first embodiment is that the adsorbent 15 is a part that adsorbs only the radioactive rare gas from the radioactive rare gas and nitrogen cooled using the cooler 13, and one adsorbent 15 is installed on the main pipe 21A.
[0060] The main exhaust pipe 27A is installed downstream of the adsorbent 15, and is a line (piping) for releasing nitrogen into the atmosphere.
[0061] The main exhaust pipe valve 35 is provided in the main exhaust pipe 27A.
[0062] The storage tank 17 is a section for storing the nitrogen that is flowed in order to separate the radioactive rare gas adsorbed in the adsorbent 15 from the adsorbent 15, and the radioactive rare gas that has been separated from the adsorbent 15 by the nitrogen.
[0063] The storage tank pipe 29A is a line (piping) that branches off from the main exhaust pipe 27A and connects the storage tank 17 and the adsorbent 15.
[0064] The storage tank pipe valve 37 is provided on a storage tank pipe 29A branching off from the main exhaust pipe 27A.
[0065] In FIG. 4, when a mixed gas consisting of radioactive rare gas, nitrogen, water vapor, hydrogen, etc. in the reactor containment vessel 5 flows into the vent system 1A, it is first separated into hydrogen and water vapor and radioactive rare gas and nitrogen by the rare gas filter 11, and the water vapor and hydrogen are released into the atmosphere via the filter exhaust pipe 23.
[0066] The high-temperature radioactive rare gas and nitrogen separated from the mixed gas flow into the cooler 13 via the main pipe 21A and are cooled because the bypass pipe valve 33 is closed and the main pipe valve 31 is open. The cooled radioactive rare gas and nitrogen then flow into the adsorbent 15, and the radioactive rare gas is adsorbed by the adsorbent 15.
[0067] Thereafter, the radioactive rare gas is adsorbed, leaving only nitrogen, and the main exhaust pipe valve 35 opens and the storage tank pipe valve 37 closes, so that the nitrogen is released to the atmosphere via the main exhaust pipe 27A.
[0068] In this embodiment, in the state shown in FIG. 4, gas does not pass through the storage tank 17, the small diameter bypass pipe 25A, and the storage tank pipe 29A.
[0069] After filter venting has been performed for a certain period of time in the state shown in FIG. 4, the main pipe valve 31, the bypass pipe valve 33, the main exhaust pipe valve 35, and the storage tank pipe valve 37 are switched between open and closed to achieve the state shown in FIG.
[0070] In FIG. 5, when a gas mixture consisting of radioactive rare gas, nitrogen, water vapor, hydrogen, etc. in the reactor containment vessel 5 flows into the vent system 1A, it is first separated into hydrogen and water vapor and radioactive rare gas and nitrogen by the rare gas filter 11, and the water vapor and hydrogen are released into the atmosphere via the filter exhaust pipe 23, which is the same as in the previous example.
[0071] The high-temperature radioactive rare gas and nitrogen separated from the mixed gas flow as high-temperature radioactive rare gas and nitrogen through the small-diameter bypass piping 25A to the adsorbent 15 as they are because the main piping valve 31 is closed and the bypass piping valve 33 is open, and the radioactive rare gas adsorbed by the adsorbent 15 is separated from the adsorbent 15.
[0072] The high-temperature radioactive rare gases and nitrogen, including the high-temperature radioactive rare gases that had been adsorbed by the adsorbent 15, flow into the storage tank 17 via the storage tank pipe 29A and are stored there, because the main exhaust pipe valve 35 is closed and the storage tank pipe valve 37 is open.
[0073] In this embodiment, gas does not pass through the cooler 13 in the state shown in FIG.
[0074] After performing filter venting for a certain period of time in the state of Fig. 5, the main pipe valve 31, the bypass pipe valve 33, the main exhaust pipe valve 35, and the storage tank pipe valve 37 are switched between open and closed to achieve the state of Fig. 4. This switching is performed appropriately. This switching may also be automatic or manual, and is not particularly limited.
[0075] The other configurations and operations are substantially the same as those of the vent system of the first embodiment described above, and the details are omitted here.
[0076] As in the vent system 1A for discharging gas from the reactor containment vessel 5 in the second embodiment of the present invention, by including a main pipe 21A connected to the reactor containment vessel 5, a rare gas filter 11 provided on the main pipe 21A for separating hydrogen and water vapor from radioactive rare gas and nitrogen, an adsorbent 15 provided on the main pipe 21A, and a main exhaust pipe 27A provided downstream of the adsorbent 15 for releasing nitrogen into the atmosphere, it is possible to obtain substantially the same effects as the vent system 1 in the first embodiment described above.
[0077] In addition, in the vent system 1A of the present embodiment, the adsorbent 15 is made single, compared to the vent system 1 of the first embodiment. Therefore, although venting is not possible while the radioactive rare gas is being separated from the adsorbent 15, the configuration, particularly the configuration around the adsorbent 15, can be simplified, making it possible to reduce the amount of equipment required.
[0078] <Other> The present invention is not limited to the above-mentioned embodiment, but includes various modified examples. The above-mentioned embodiment has been described in detail to explain the present invention in an easily understandable manner, and the present invention is not necessarily limited to the embodiment having all of the described configurations.
[0079] It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace part of the configuration of each embodiment with the configuration of another embodiment. [Explanation of symbols]
[0080] 1,1A…Vent system 5…Reactor containment vessel 11...Rare gas filter 13...Cooler 15, 15a, 15b...Adsorbent 17…Storage tank (storage facility) 21, 21A…Main piping (main line) 23...Filter exhaust pipe 25, 25A...Small diameter bypass piping (bypass line) 27, 27A…Main exhaust pipe (vent line) 29, 29A…Storage tank pipe (storage line) 31, 31a, 31b...Main piping valve (main line valve) 33, 33a, 33b...Bypass piping valve (bypass line valve) 35...Main exhaust pipe valve (vent line valve) 35a, 35b...First main exhaust pipe valve (vent line valve) 37, 37a, 37b...Storage tank pipe valve (storage line valve) 39…Second main exhaust valve
Claims
1. A vent system for venting gas from a nuclear reactor containment vessel, comprising: A main line connected to the reactor containment vessel; a rare gas filter provided on the main line for separating hydrogen and water vapor from rare gas and nitrogen; A plurality of adsorbents are installed in parallel on the main line; a vent line disposed downstream of the adsorbent for releasing the nitrogen into the atmosphere. Vent system.
2. A vent system for venting gas from a nuclear reactor containment vessel, comprising: A main line connected to the reactor containment vessel; a rare gas filter provided on the main line for separating hydrogen and water vapor from rare gas and nitrogen; an adsorbent installed on the main line; a vent line disposed downstream of the adsorbent for releasing the nitrogen into the atmosphere. Vent system.
3. The vent system according to claim 1 or 2, a bypass line for passing the rare gas and the nitrogen, the bypass line being branched off from the main line downstream of the rare gas filter; a cooler provided in the main line downstream of a branch point with the bypass line. Vent system.
4. The vent system according to claim 1 or 2, a storage tank for storing the nitrogen that is supplied to separate the rare gas adsorbed by the adsorbent from the adsorbent, and the rare gas separated from the adsorbent by the nitrogen; a reservoir line branching from the vent line and connected to the reservoir. Vent system.
5. 2. The vent system of claim 1, a bypass line for passing the rare gas and the nitrogen, the bypass line being branched off from the main line downstream of the rare gas filter; a cooler provided in the main line downstream of a branch point with the bypass line; a storage tank for storing the nitrogen that is supplied to separate the rare gas adsorbed by the adsorbent from the adsorbent, and the rare gas separated from the adsorbent by the nitrogen; a reservoir line branching off from the vent line and connected to the reservoir; a plurality of main line valves provided in a portion of the main line branching toward the plurality of adsorbents in a downstream of the cooler; a plurality of bypass line valves provided in a portion of the bypass line branching toward the plurality of adsorbents; a plurality of vent line valves provided in a front-stage portion of the vent line where the plurality of adsorbents join; A plurality of storage line valves are provided in the storage line at a front-stage portion where the plurality of adsorbents join together, The main line valve, the bypass line valve, the vent line valve, and the storage line valve are switched between open and closed to continue filter venting and separate the rare gas from the adsorbent in parallel. Vent system.
Citation Information
Patent Citations
Reactor container vent system
JP2022051390A