JP2022100993A - Nuclear reactor containment vessel vent system - Google Patents

Abstract

To provide a highly efficient nuclear reactor containment vessel vent system in which a blower installed in a return line to the inside of a nuclear reactor containment vessel can be driven with a minimally required battery capacity, or without using the battery, the nuclear reactor containment vessel vent system being configured to discharge a part of gas inside the nuclear reactor containment vessel.SOLUTION: A nuclear reactor containment vessel vent system is provided which externally discharges a part of gas inside a nuclear reactor containment vessel 1 and depressurizes the inside of the nuclear reactor containment vessel, the nuclear reactor containment vessel vent system comprises: a vent line that is constituted of piping connected to the inside of the nuclear reactor containment vessel; and a membrane filter 15 that is disposed in the vent line, does not transmit radioactive noble gas, but transmits water vapor. The vent line has: a return line connecting the piping on an upper stream side of the membrane filter and the inside of the nuclear reactor containment vessel to each other; and a power mechanism that is disposed in the return line and returns the radioactive noble gas to the inside of the nuclear reactor containment vessel. The power mechanism uses flowing gas in the vent line as a driving source.SELECTED DRAWING: Figure 1

Description

The present invention relates to the structure of a nuclear power plant, and particularly relates to a technique effective by applying to the structure of a vent line that discharges gas in a reactor containment vessel to the outside.

One of the functions of the reactor containment vessel installed in a nuclear power plant is that the core placed in the reactor pressure vessel should melt (hereinafter referred to as a severe accident), and the radioactive material becomes an atom. Even if it is released to the outside of the reactor pressure vessel, radioactive substances may be trapped inside the reactor containment vessel to prevent leakage to the outside. Even if a severe accident occurs, the accident will be resolved if sufficient water injection is performed after that and the reactor containment vessel is cooled.

However, in the unlikely event that steam generation continues and the reactor containment vessel is insufficiently cooled, the reactor containment vessel is pressurized. When the reactor containment vessel is pressurized, the gas in the reactor containment vessel may be released into the atmosphere to reduce the pressure in the reactor containment vessel. This operation is called a vent operation. When performing this operation, in boiling water reactors, the gas in the reactor containment vessel is usually removed with pool water from the suppression pool to minimize public exposure (hereinafter referred to as “gas” in the reactor containment vessel. Bent gas) is released into the atmosphere.

In a boiling water reactor, as described above, radioactive substances are sufficiently removed from the pool water of the suppression pool and then the bent gas is released into the atmosphere. The reactor is a system that further removes radioactive substances from this bent gas. There is a containment vent system.

As a background technique in this technical field, for example, there is a technique such as Patent Document 1. In Patent Document 1, a membrane filter is placed downstream of the reactor containment vessel vent system so that the less reactive radioactive noble gases such as xenone and krypton do not permeate from the vent gas, and the radioactive noble gases and the like are returned to the reactor containment vessel. , A system has been proposed to further reduce the radioactive substances contained in the gas emitted into the atmosphere.

JP-A-2018-151355

In a system in which a membrane filter that does not allow radioactive noble gas to permeate is installed outside the reactor containment vessel as in Patent Document 1, deterioration of the membrane filter is suppressed as compared with the case where it is installed inside the reactor containment vessel. Can be done.

On the other hand, in order to prevent the retention of gases such as nitrogen and rare gases other than water vapor and hydrogen discharged into the atmosphere, it is necessary to pressurize using a blower or the like and return the gas to the reactor containment vessel. A battery is assumed as the power source for the blower during venting, but it is desirable to reduce the capacity as much as possible.

Therefore, an object of the present invention is to minimize the blower installed in the return line into the reactor containment vessel in the reactor containment vessel vent system that discharges a part of the gas in the reactor containment vessel to the outside. It is an object of the present invention to provide a highly efficient reactor containment vessel vent system that can be driven by the battery capacity or without using a battery.

In order to solve the above problems, the present invention presents the reactor containment vessel in the reactor containment vessel vent system in which a part of the gas in the reactor containment vessel is discharged to the outside and the inside of the reactor containment vessel is depressurized. The vent line is provided with a vent line composed of pipes connected to the inside and a membrane filter arranged in the vent line that does not allow radioactive rare gas to permeate but allows water vapor to permeate. It has a return line that connects the upstream pipe and the inside of the reactor storage container, and a power mechanism that is arranged in the return line and returns the radioactive rare gas to the inside of the reactor storage container. The mechanism is characterized in that the fluid gas in the vent line is used as a drive source.

According to the present invention, in the reactor containment vent system that discharges a part of the gas in the reactor containment vessel to the outside, the blower installed in the return line into the reactor containment vessel has the minimum necessary battery capacity. It is possible to realize a highly efficient reactor containment vessel vent system that can be driven by or without using a battery.

As a result, even in the unlikely event of a severe accident, the blower can continue to operate, water vapor and hydrogen can be released to the outside, and gas containing radioactive substances can be returned to the reactor containment vessel. ..

Issues, configurations and effects other than those described above will be clarified by the following description of the embodiments.

It is a figure which shows the structure of the reactor containment vessel vent system which concerns on Example 1 of this invention. It is a figure which shows the structure of the reactor containment vessel vent system which concerns on Example 2 of this invention. It is a figure which shows the structure of the reactor containment vessel vent system which concerns on Example 3 of this invention. It is a figure which shows the relationship between the wet well pressure and the efficiency of a drive source in the reactor containment vessel vent system of FIG. It is a figure which shows the structure of the reactor containment vessel vent system which concerns on Example 4 of this invention. It is a figure which shows the structure of the reactor containment vessel vent system which concerns on Example 5 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same components are designated by the same reference numerals, and the detailed description of the overlapping portions will be omitted.

The reactor containment vessel vent system according to the first embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of the reactor containment vessel vent system of the present embodiment including the reactor containment vessel 1. The inside of the broken line box in the figure is the reactor containment vessel vent system of this embodiment.

Although FIG. 1 shows an example of a boiling water reactor in which the suppression pool 8 is installed in the reactor containment vessel 1, it can also be applied to a pressurized water reactor or the like.

The reactor containment vessel vent system of this embodiment reduces the pressure inside the reactor containment vessel by discharging the gas inside the reactor containment vessel to the outside in the event of a severe accident such as damage to the reactor containment vessel. In addition, radioactive substances are removed as much as possible from the gas discharged to the outside when the pressure is reduced.

The reactor containment vessel vent system of this embodiment shown in FIG. 1 is an example applied to an improved boiling water reactor, and has the following system configuration. A reactor pressure vessel 3 containing a core 2 is installed in the reactor containment vessel 1. A main steam pipe 4 for sending steam generated in the reactor pressure vessel 3 to a turbine (not shown) is connected to the reactor pressure vessel 3.

The inside of the reactor containment vessel 1 is divided into a dry well 6 and a wet well 7 by a reinforced concrete diaphragm floor 5. The wet well 7 refers to an area in which pool water is stored. The pool in the wet well 7 is called a suppression pool 8.

The dry well 6 and the wet well 7 are communicated with each other by a vent pipe 9, and the vent pipe exhaust portion 9a opens below the water surface of the suppression pool 8 in the wet well 7.

In the unlikely event that a part of the pipes was damaged and steam was released into the reactor containment vessel 1, a pipe breakage accident (generally known as LOCA, which occurs in the dry well 6 through which the pipes pass) occurred. In this case, the pressure of the dry well 6 is increased by the steam flowing out from the break port. At that time, the steam released into the dry well 6 is guided to the suppression pool 8 water in the wet well 7 through the vent pipe 9 by the pressure difference between the dry well 6 and the wet well 7.

By condensing the steam with the water in the suppression pool 8, the pressure rise in the reactor containment vessel 1 is suppressed. If radioactive substances are contained in the steam at this time, most of the radioactive substances are removed by the scrubbing effect of the suppression pool 8 water.

Similarly, when the pressure of the reactor pressure vessel 3 and the main steam pipe 4 becomes high, the steam is discharged to the suppression pool 8 and the pressure of the reactor pressure vessel 3 and the main steam pipe 4 is reduced. At the same time, the released steam is condensed in the suppression pool 8 to alleviate the pressure increase in the reactor containment vessel 1. As a device for that purpose, in the improved boiling water reactor, a steam escape safety valve 10 is installed in the region of the dry well 6 in the reactor containment vessel 1.

The steam released through the steam escape safety valve 10 is finally released from the quencher 12 into the suppression pool 8 through the steam escape safety valve exhaust pipe 11, and is condensed by the pool water of the suppression pool 8. By condensing the steam in the suppression pool 8 into liquid water, the volume of the steam can be significantly reduced and the pressure increase in the reactor containment vessel 1 can be suppressed. If the steam contains radioactive substances at that time, most of the radioactive substances are removed by the scrubbing effect of the water in the suppression pool 8.

By condensing steam in the suppression pool 8 and cooling the pool water in the suppression pool 8 with a residual heat removal system (not shown), the temperature rise and pressure rise of the reactor containment vessel 1 are prevented, and the accident is resolved. Can be made to. However, although very unlikely, if the residual heat removal system loses its function, the temperature of the pool water in the suppression pool 8 will rise. As the temperature of the pool water rises, the partial pressure of the steam in the reactor containment vessel 1 rises to the saturated steam pressure of the temperature of the pool water, so that the pressure of the reactor containment vessel 1 rises.

When such a pressure rise occurs, it is conceivable to suppress the pressure rise by connecting a fire pump or the like from the outside and utilizing the reactor containment spray system. However, although it is possible that it is even lower, if these devices do not operate and the pressure in the reactor containment vessel 1 continues to rise, the gas in the reactor containment vessel 1 is discharged to the outside to retract the reactor. It is possible to suppress an increase in pressure in the containment vessel 1. This operation is called a vent operation.

In boiling water reactors, this venting operation is generally performed by releasing the gas in the wet well 7, removing as much radioactive material as possible with the water in the suppression pool 8 and then discharging the gas to the outside. do.

A device that removes radioactive substances from the gas released to the outside in performing this vent operation is called a reactor containment vent system.

In the reactor containment vessel vent system of this embodiment, as shown in FIG. 1, a vent pipe 13 is connected to a wet well 7 of the reactor containment vessel 1, and an isolation valve 14 is arranged in the vent pipe 13. Has been done. A membrane filter 15 that does not allow radioactive noble gas and nitrogen to permeate is connected to the downstream of the vent pipe 13.

The gases discharged from the wet well 7 are mainly radioactive noble gases (1), nitrogen (2), water vapor (3), and hydrogen (4). By installing the membrane filter 15, water vapor (3) and hydrogen (3) and hydrogen ( 4) is selectively discharged from the exhaust tower 16 to the outside.

A blower 17 is installed downstream of the membrane filter 15 (return line into the reactor containment vessel 1), and the downstream of the vent pipe 13 is connected to the reactor containment vessel 1. The radioactive noble gas (1) and nitrogen (2) that do not pass through the membrane filter 15 are pressurized by the blower 17 and returned to the reactor containment vessel 1 through the return line into the reactor containment vessel 1 of the vent pipe 13. .. In the absence of the blower 17, the radioactive noble gas (1) and nitrogen (2) stay in the vicinity of the membrane filter 15, and the function of this system deteriorates.

A check valve 18 is provided between the connection portion of the vent pipe 13 with the reactor containment vessel 1 and the blower 17, to prevent the backflow of gas from the reactor containment vessel 1. As the membrane filter 15 that does not permeate radioactive noble gas and nitrogen, it is conceivable to use a polymer membrane containing polyimide as a main component.

An electric motor 19 is connected to the blower 17, and a battery 20 is connected to the electric motor 19. The blower 17 is driven by the electric energy of the battery 20, but it is desirable that the capacity of the battery 20 is reduced. This also contributes to mitigating the influence of the battery 20 when it fails.

Therefore, in the reactor containment vessel vent system of the present embodiment, as shown in FIG. 1, a turbine 21 is installed upstream of the vent pipe 13, and the turbine is driven by the fluid gas discharged from the reactor containment vessel 1. 21 is operated. A generator 22 is connected to the turbine 21, and the generator 22 is connected to the battery 20.

Therefore, the energy of the flowing gas in the vent pipe 13 is converted into electric energy by the turbine 21 and the generator 22 and stored in the battery 20, and the blower 17 is driven by this energy.

The flowing gas that drives the turbine 21 is a mixed gas of radioactive rare gas (1), nitrogen (2), steam (3), and hydrogen (4), and the gas returned to the reactor containment vessel 1 by the blower 17 is a membrane. Since only the radioactive rare gas (1) and nitrogen (2) that did not pass through the filter 15, the mass flow rate is reduced, and the blower 17 can be a driving source due to the energy balance. With the above configuration, the capacity of the battery 20 can be reduced.

As described above, the reactor containment vessel vent system of the present embodiment is a reactor containment vessel vent system that discharges a part of the gas in the reactor containment vessel 1 to the outside and decompresses the inside of the reactor containment vessel 1. A vent line composed of pipes (vent pipe 13) connected to the reactor storage container 1 and a membrane filter 15 arranged in the vent line and not permeating radioactive rare gas but permeating water vapor. The vent line is provided in the return line connecting the upstream pipe (vent pipe 13) of the membrane filter 15 and the inside of the reactor storage container 1 and the return line to store the radioactive rare gas in the reactor. It has a power mechanism (blower 17) for returning to the inside of the container 1, and the power mechanism (blower 17) uses the flowing gas in the vent line as a drive source.

The flowing gas is a gas that flows upstream of the vent line with respect to the membrane filter 15.

Further, the power mechanism (blower 17) is connected to the motor 19 and the battery 20.

Further, the vent line has a turbine 21 driven by a fluid gas and a generator 22 that generates electricity by the turbine 21, and drives a power mechanism (blower 17) by electric energy generated by the generator 22.

As the membrane filter 15 that does not permeate radioactive rare gas and nitrogen but permeates steam and hydrogen, in addition to the above-mentioned filter using a polymer membrane containing polyimide as a main component, a ceramic membrane, a silica membrane, and carbon are used. Examples thereof include a filter using a membrane, a filter using a polymer membrane containing polysulfone and polyether ether ketone as a main component, and a filter using a ceramic membrane containing silica or silicon nitride as a main component.

The reactor containment vessel vent system according to the second embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a vertical cross-sectional view showing a schematic configuration of the reactor containment vessel vent system of the present embodiment including the reactor containment vessel 1. The inside of the broken line box in the figure is the reactor containment vessel vent system of this embodiment. The configuration of the reactor containment vessel 1 and the basic configurations of the membrane filter 15, the vent pipe 13, and the like are substantially the same as those of the first embodiment, and here, the differences from the first embodiment will be mainly described.

In the reactor containment vessel vent system of this embodiment, as shown in FIG. 2, the dry well 6 and the wet well 7 are connected by an external pipe 23 of the reactor containment vessel 1. The isolation valve 14b is arranged in the pipe 23 on the dry well 6 side, and the check valve 18b is arranged in the pipe 23 on the wet well 7 side.

A turbine 21 that operates using a flowing gas flowing from the dry well 6 to the wet well 7 as a drive source is connected to the pipe 23. The mixed gas of the radioactive rare gas (1), nitrogen (2), steam (3), and hydrogen (4) flowing in the pipe 23 is transferred from the dry well 6 to the wet well 7 by the differential pressure between the dry well 6 and the wet well 7. Although it flows, the pressure energy of this gas (energy of the flowing gas) is converted into electric energy by the turbine 21 and the generator 22 and stored in the battery 20, and is used as a drive source for the blower 17 as in the first embodiment.

This configuration also has the effect of scrubbing the mixed gas discharged from the dry well 6 with the water of the suppression pool 8.

The reactor containment vessel vent system according to the third embodiment of the present invention will be described with reference to FIGS. 3 and 4.

FIG. 3 is a vertical cross-sectional view showing a schematic configuration of the reactor containment vessel vent system of the present embodiment including the reactor containment vessel 1. The inside of the broken line box in the figure is the reactor containment vessel vent system of this embodiment. The configuration of the reactor containment vessel 1 and the basic configurations of the membrane filter 15, the vent pipe 13, and the like are substantially the same as those of the first embodiment, and here, the differences from the first embodiment will be mainly described.

In the reactor containment vessel vent system of this embodiment, as shown in FIG. 3, the rotary shaft 24 of the blower 17 is extended and directly connected to the rotary shaft of the turbine 21. As a result, the rotation of the turbine 21 directly becomes the drive source of the blower 17.

Since the blower 17 and the turbine 21 are directly connected, the physical arrangement is restricted, but the energy transformation (loss) is smaller and the energy efficiency of the drive source is higher than in the first and second embodiments. ..

Further, if the pressure loss of the entire system is reduced by increasing the diameter of the vent pipe 13 and reducing the flow velocity of the mixed gas, the blower 17 can be statically driven.

The static drive of the blower 17 will be described with reference to FIG. FIG. 4 shows the efficiency of the drive source required for static drive of the blower 17 with respect to the wetwell pressure when the system pressure drop is small in a typical vent sequence.

In FIG. 4, the efficiency of the drive source required for static drive increases as the wetwell pressure decreases. This is because as the venting progresses and the pressure of the wet well decreases, the proportion of water vapor in the mixed gas discharged from the wet well decreases, that is, the relative amount of nitrogen (2) returned by the blower 17 increases. ..

Since the efficiency of a general steam-driven turbine is about 0.8 and the efficiency of a blower is about 0.7, the efficiency of a drive source that can be generally expected is about 0.56 when multiplied.

From FIG. 4, the range in which the system can be statically driven is 0.32 MPa or more. That is, static driving is possible from the start of venting until the pressure of the wet well drops to 0.32 MPa.

If the pressure of the wet well becomes 0.32 MPa or less and the vent cannot be sustained, water vapor accumulates in the reactor containment vessel, and if the pressure of the wet well becomes 0.32 MPa or more, it may be statically driven again.

The reactor containment vessel vent system according to the fourth embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a vertical cross-sectional view showing a schematic configuration of the reactor containment vessel vent system of the present embodiment including the reactor containment vessel 1. The inside of the broken line box in the figure is the reactor containment vessel vent system of this embodiment. The configuration of the reactor containment vessel 1 and the basic configurations of the membrane filter 15, the vent pipe 13, and the like are substantially the same as those of the first embodiment, and here, the differences from the first embodiment will be mainly described.

In the reactor containment vessel vent system of this embodiment, as shown in FIG. 5, a filter vent device 25 for removing radioactive substances from the mixed gas discharged from the reactor containment vessel 1 is provided upstream of the membrane filter 15. is set up. The filter vent device 25 is a device including a tank containing water, a filter for removing radioactive substances, and the like.

Further, the upstream of the vent pipe 13 is branched into two systems, which are connected to the dry well 6 and the wet well 7, respectively. The isolation valve 14c is provided in the vent pipe 13 connected to the dry well 6, and the isolation valve 14d is provided in the vent pipe 13 connected to the wet well 7.

This embodiment is configured as described above, and uses both the gas discharged from the dry well 6 and the gas discharged from the wet well 7 to generate electric energy in the turbine 21 and the generator 22. Then, it is stored in the battery 20 and used as a drive source for the blower 17.

Further, by installing the filter vent device 25 in the vent pipe 13 upstream of the membrane filter 15, it is necessary to consider the pressure loss in the filter vent device 25, but further removal of radioactive substances can be expected.

The reactor containment vessel vent system according to the fifth embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a vertical cross-sectional view showing a schematic configuration of the reactor containment vessel vent system of the present embodiment including the reactor containment vessel 1. The inside of the broken line box in the figure is the reactor containment vessel vent system of this embodiment. This example is an example in which the reactor containment vessel vent system of Example 1 (FIG. 1) is applied to a pressurized water reactor.

As shown in FIG. 6, since the pressurized water reactor does not have the wet well 7 and the suppression pool 8 for suppressing the pressure rise in the reactor containment vessel 1, it is expected that the suppression pool 8 will remove radioactive materials by scrubbing. Can not. Further, as in the second embodiment (FIG. 2), the gas flowing from the dry well 6 to the wet well 7 cannot be used as a drive source for the blower 17. A moisture separator 29 is provided downstream of the turbine 21 to separate the moisture of the gas discharged from the membrane filter 15. This configuration may be provided in Examples 1 to 4. Other configurations are substantially the same as those of the first embodiment (FIG. 1).

However, as in the first embodiment, by applying the reactor containment vessel vent system of the present invention to the pressurized water reactor as in the first embodiment, even if a severe accident should occur, the blower 17 can be used. The operation can be continued, steam (3) and hydrogen (4) can be released to the outside, and radioactive rare gas (1) and nitrogen (2) can be returned to the reactor containment vessel 1.

The rotary shaft 24 of the blower 17 may be extended and directly connected to the turbine 21 as in the third embodiment (FIG. 3), or the filter vent device 25 may be provided as in the fourth embodiment (FIG. 5). ..

Further, Examples 1 to 5 are examples in which the reactor containment vessel vent system of the present invention is applied to a light water reactor (boiling water reactor, pressurized water reactor), but a heavy water reactor, a graphite furnace, or a gas reactor. May be applied to. Further, it may be applied to other reactor types such as a so-called 4th generation reactor, a high temperature gas reactor, a supercritical water reactor, a molten salt reactor, a gas-cooled fast reactor, a sodium-cooled fast reactor, and a lead-cooled fast reactor. ..

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above embodiments have been described in detail to aid in understanding of the present invention and are not necessarily limited to those comprising all of the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1 ... Reactor storage vessel, 2 ... Core, 3 ... Reactor pressure vessel, 4 ... Main steam pipe, 5 ... Diaphragm floor, 6 ... Dry well, 7 ... Wet well, 8 ... Suppression pool, 9 ... Vent pipe, 9a ... Vent pipe exhaust section, 10 ... Steam escape safety valve, 11 ... Steam escape safety valve exhaust pipe, 12 ... Turbine, 13 ... Vent pipe, 14, 14a, 14b, 14c, 14d ... Isolation valve, 15 ... (Radio rare gas and nitrogen) (Does not permeate) Membrane filter, 16 ... Exhaust tower, 17 ... Blower, 18, 18a, 18b ... Check valve, 19 ... Electric motor, 20 ... Battery, 21 ... Turbine, 22 ... Generator, 23 ... Piping, 24 ... ( Rotating shaft (of blower and turbine), 25 ... filter venting device, 26 ... pressurizer, 27 ... steam generator, 28 ... recirculation pump, 29 ... moisture separator.

Claims (13)

In the reactor containment vessel vent system in which a part of the gas in the reactor containment vessel is discharged to the outside and the inside of the reactor containment vessel is depressurized.
A vent line composed of pipes connected in the reactor containment vessel, and
A membrane filter, which is arranged in the vent line and does not allow radioactive noble gas to pass through but allows water vapor to pass through, is provided.
The vent line includes a return line connecting the piping on the upstream side of the membrane filter and the inside of the reactor containment vessel.
It has a power mechanism, which is arranged in the return line and returns the radioactive noble gas into the reactor containment vessel.
The power mechanism is a reactor containment vessel vent system characterized in that a fluid gas in the vent line is used as a drive source. In the reactor containment vessel vent system according to claim 1,
The reactor containment vessel vent system, wherein the fluidized gas is a gas that flows upstream of the vent line with respect to the membrane filter. In the reactor containment vessel vent system according to claim 1,
The vent line has a pipe connecting the dry well and the wet well of the reactor containment vessel.
The reactor containment vessel vent system, wherein the fluid gas is a fluid gas in a pipe connecting the dry well and the wet well. In the reactor containment vessel vent system according to any one of claims 1 to 3.
The power mechanism is a reactor containment vessel vent system, characterized in that it is connected to a battery. In the reactor containment vessel vent system according to any one of claims 1 to 4.
The vent line has a turbine driven by the fluid gas.
A reactor containment vessel vent system characterized in that the power mechanism is driven by the electric energy generated by the turbine. In the reactor containment vessel vent system according to claim 1,
The vent line has a turbine driven by the fluid gas.
A reactor containment vessel vent system, characterized in that the rotary shaft of the power mechanism and the rotary shaft of the turbine are directly connected. In the reactor containment vessel vent system according to any one of claims 1 to 6.
The reactor containment vessel has a dry well and a wet well.
The power mechanism is a reactor containment vessel vent system characterized in that it is statically driven under a wet well pressure of 0.32 MPa or more without requiring power supply from a battery. In the reactor containment vessel vent system according to any one of claims 1 to 7.
The membrane filter is a reactor containment vessel vent system, characterized in that it is a filter using any of a polymer membrane, a ceramic membrane, a silica membrane, and a carbon membrane. In the reactor containment vessel vent system according to any one of claims 1 to 7.
The membrane filter is a reactor containment vessel vent system characterized by being a filter using a polymer membrane containing any one of polyimide, polysulfone, and polyether ether ketone as a main component. In the reactor containment vessel vent system according to any one of claims 1 to 7.
The membrane filter is a reactor containment vessel vent system, characterized in that it is a filter using a ceramic membrane containing silica or silicon nitride as a main component. In the reactor containment vessel vent system according to claim 1,
The reactor containment vessel vent system, characterized in that the vent line has a filter vent device for removing radioactive substances on the upstream side of the membrane filter. In the reactor containment vessel vent system according to claim 1,
The reactor containment vessel venting system, wherein the reactor containment vessel is a boiling water reactor or a pressurized water reactor reactor containment vessel. In the reactor containment vessel vent system according to claim 1,
The membrane filter is a reactor containment vessel vent system characterized in that it does not permeate radioactive noble gases and nitrogen, but permeates water vapor and hydrogen.

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