Containment suppression, filtration and discharge system for floating nuclear power platform

Abstract

The invention provides a containment suppression, filtration and discharge system for a floating nuclear power platform. Comprising a containment, a first discharge valve, a first discharge pipeline, a first spray pipe, a first-stage pressure suppression water tank, a second-stage pressure suppression water tank, an expansion cabin, a second discharge valve, a filter cabin, a second spray pipe, an air cooler, a radioactivity monitor, a passive residual heat discharge water tank, a first stop valve and a second stop valve. By arranging a plurality of radioactive removal means which are connected in series, including two-stage bubbling washing, static mixer bubble cutting, efficient metal fiber filtering, silver zeolite filtering and the like, efficient removal of airborne radioactive substances (aerosol, inorganic iodine and organic iodine) can be realized; and the radioactive influence of overpressure discharge of the containment on the environment under the condition of serious accidents is reduced. The air cooler is arranged on the filtering and discharging pipeline to condense discharged steam, condensate returns to the filtering cabin by means of the gravity difference, and long-term passive effective operation of the water scrubber can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of special safety facilities and radiation protection for nuclear power plants, and in particular relates to a containment pressure suppression filtering and discharge system for a floating nuclear power platform. Background Art

[0002] The containment is the compartment in the offshore nuclear power platform that houses high-energy, high-radioactive equipment and pipelines such as the reactor and the primary circuit system. It is the last safety barrier to prevent the release of radioactive materials into the external environment after a breach accident. Therefore, it is of great significance to ensure its integrity.

[0003] For marine nuclear power plants and floating power stations, the free volume of the containment is much smaller than that of the containment of a nuclear power plant due to the constraints of overall resources. When a breach occurs in the primary circuit of the containment, a large amount of high-temperature and high-pressure coolant flashes and sprays into the containment, causing the pressure inside the containment to rise sharply. If the pressure cannot be reduced quickly, the pressure of the containment will rise rapidly within tens of seconds and exceed its designed pressure. In view of the extremely high mass and energy release rate in the early stage of the containment breach accident, the spray system and the passive containment cooling system alone cannot meet the pressure reduction requirements of the containment.

[0004] At present, the mainstream containment filtration and emission systems of nuclear power mainly consist of two stages: wet Venturi water washing and dry metal fiber filtration. With the long-term operation of the filtration and emission system, the high-temperature and high-pressure exhaust steam and the decay heat of the radioactive substances trapped in the water washing liquid will continue to heat the water washing liquid. When the water washing liquid reaches the saturation temperature, the water washing liquid will decrease or even evaporate, which will seriously affect the operating efficiency of the filtration and emission system.

[0005] Therefore, how to improve a containment pressure suppression filtering and discharge system for a floating nuclear power platform that can meet the needs of rapid pressure reduction of the containment and efficient removal of radioactive substances after an accident of the floating nuclear power platform, and solve the problem of water wash liquid reduction after long-term operation of the existing nuclear power filtering and discharge device, has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The embodiment of the present invention provides a containment pressure suppression filtering and drainage system for a floating nuclear power platform, which can meet the needs of rapid pressure reduction of the containment and efficient removal of radioactive substances after an accident of the floating nuclear power platform, and solve the problem of water washing liquid reduction after long-term operation of the existing nuclear power filtering and drainage device.

[0007] In an embodiment of the present invention, a containment pressure suppression filtration and discharge system for a floating nuclear power platform is provided, characterized in that the system includes: a containment, a first discharge valve, a first discharge pipeline, a first nozzle, a first-stage pressure suppression water tank, a second-stage pressure suppression water tank, an expansion tank, a second discharge valve, a filter compartment, a second nozzle, an air cooler, a radioactivity monitor, a passive residual heat discharge water tank, a first stop valve and a second stop valve.

[0008] The containment shell is connected to the first-stage pressure suppression water tank through the first discharge valve, the first discharge pipe and the first nozzle, and the first-stage pressure suppression water tank is connected to the second-stage pressure suppression water tank through the second discharge pipe and the first nozzle; the first-stage pressure suppression water tank and the second-stage pressure suppression water tank are respectively loaded with a mixed solution for absorbing iodine in the discharge gas; the first stop valve is arranged between the first-stage pressure suppression water tank and the expansion tank and the containment shell;

[0009] The expansion cabin is connected to the filter cabin through the second discharge valve, and the filter cabin includes a steam-water separator and a metal fiber filter layer, which is used to capture the most penetrating particle size aerosol that is difficult to remove by water washing; the filter cabin is connected to the air cooler through a condensate return pipeline; the passive waste heat discharge water tank is connected to the condensate return pipeline through the second stop valve;

[0010] The radioactivity monitor is used to monitor the radioactivity dose released into the environment and the filtering ability of the system for radioactive substances. A bursting membrane structure is arranged between the radioactivity monitor and the air cooler.

[0011] When the pressure in the first-level pressure suppression water tank, the second-level pressure suppression water tank and the expansion tank is higher than the containment pressure, the first stop valve is opened to relieve the pressure in the first-level pressure suppression water tank, the second-level pressure suppression water tank and the expansion tank; when the pressure in the containment is higher than the pressure in the first-level pressure suppression water tank and the second-level pressure suppression water tank, the first-level pressure suppression water tank and the second-level pressure suppression water tank realize the pressure suppression and water washing functions.

[0012] Furthermore, the system is provided with a serial radioactive removal device including at least a two-stage bubbling water washing structure, a static mixer cutting bubble structure, a high-efficiency metal fiber filtration structure and a silver zeolite filtration structure, which is used to remove airborne radioactive substances including aerosols, inorganic iodine and organic iodine.

[0013] Furthermore, a parallel pipeline with a stop valve is provided on the pipeline where the bursting membrane structure is located, so as to manually open the stop valve on the parallel pipeline when the bursting membrane structure fails to open.

[0014] Further, the opening pressure of the bursting membrane structure is the same as the opening pressure of the second discharge valve.

[0015] Furthermore, the discharge pipeline of the system is provided with a flow-limiting orifice plate for limiting the discharge flow rate, one end of the flow-limiting orifice plate is connected to the radioactivity monitor, and the other end is connected to the bursting membrane structure.

[0016] Furthermore, the first-stage pressure suppression water tank and the second-stage pressure suppression water tank are respectively loaded with a mixed solution for absorbing iodine in the exhaust gas, including:

[0017] The mixed solution is a mixed solution of sodium hydroxide iodide and sodium thiosulfate, and the mixed solution absorbs iodine in the exhaust gas through a chemical reaction.

[0018] Furthermore, a silver zeolite filter for effectively removing methyl iodide in the exhaust gas is arranged downstream of the metal fiber filter layer to reduce the radioactivity of the exhaust gas.

[0019] Furthermore, the excess condensate generated by air cooling of filtered exhaust steam in the system flows into the passive waste heat removal water tank, which serves as a heat sink of the passive waste heat removal system to take away the heat released by a circuit and extend the effective operation time of the system.

[0020] Furthermore, the air cooler is arranged horizontally and tilted downward, and the condensation rate of the air cooler is controlled by an adjustable damper of a chimney air duct arranged above the air cooler.

[0021] Furthermore, the system further comprises: a high-pressure medicine replenishing device;

[0022] The high-pressure medicine replenishing device is used to add sodium hydroxide and sodium sulfate solution into the filtering chamber to compensate for the concentration change of the water washing liquid in the filtering chamber caused by evaporation.

[0023] The beneficial effects brought by the present invention are as follows:

[0024] It can be seen from the above scheme that the embodiment of the present invention provides a containment pressure suppression filtration and discharge system for a floating nuclear power platform, including: a containment, a first discharge valve, a first discharge pipeline, a first nozzle, a first-level pressure suppression water tank, a second-level pressure suppression water tank, an expansion tank, a second discharge valve, a filter compartment, a second nozzle, an air cooler, a radioactivity monitor, a passive residual heat discharge water tank, a first stop valve and a second stop valve. When the pressure in the first-level pressure suppression water tank, the second-level pressure suppression water tank and the expansion tank is higher than the pressure in the containment, the first stop valve is opened to release the pressure. When the pressure in the containment is higher than the pressure in the first-level pressure suppression water tank and the second-level pressure suppression water tank, the first-level pressure suppression water tank and the second-level pressure suppression water tank realize the pressure suppression and water washing functions. The technical scheme of the present invention can meet the needs of rapid pressure reduction of the containment after an accident of a floating nuclear power platform and efficient removal of radioactive substances, and solve the problem of water washing liquid reduction after long-term operation of the existing nuclear power filtration and discharge device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram showing the structure of a containment pressure suppression filtration and drainage system for a floating nuclear power platform according to an embodiment of the present invention;

[0026] In the figure, 1 is a containment shell, 2 is a first discharge valve, 3 is a first discharge pipe, 4 is a first nozzle, 5 is a first-stage pressure suppression water tank, 6 is a second-stage pressure suppression water tank, 7 is an expansion tank, 8 is a second discharge valve, 9 is a filter compartment, 10 is a second nozzle, 11 is a static mixer, 12 is a steam-water separator, 13 is a metal fiber filter layer, 14 is a first stop valve, 19 / 21 / 23 / 25 is a second stop valve, 15 is a silver zeolite filter, 16 is an air cooler, 17 is a chimney duct, 18 is an adjustable damper, 18 is a condensate return pipeline, 20 is a passive waste heat discharge water tank, 22 is a high-pressure medicine replenishing device, 24 is a bursting membrane, 26 is a flow limiting orifice plate, and 27 is a radioactivity monitor. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, Figure 1 A schematic structural diagram of a containment pressure suppression, filtration and discharge system for a floating nuclear power platform according to an embodiment of the present invention is shown.

[0029] Figure 1A containment pressure suppression filtration and discharge system for a floating nuclear power platform is provided, characterized in that the system comprises: a containment, a first discharge valve, a first discharge pipeline, a first nozzle, a first-stage pressure suppression water tank, a second-stage pressure suppression water tank, an expansion tank, a second discharge valve, a filter compartment, a second nozzle, an air cooler, a radioactivity monitor, a passive residual heat discharge water tank, a first stop valve and a second stop valve.

[0030] The containment shell is connected to the first-stage pressure suppression water tank through the first discharge valve, the first discharge pipe and the first nozzle, and the first-stage pressure suppression water tank is connected to the second-stage pressure suppression water tank through the second discharge pipe and the first nozzle; the first-stage pressure suppression water tank and the second-stage pressure suppression water tank are respectively loaded with a mixed solution for absorbing iodine in the discharge gas; the first stop valve is arranged between the first-stage pressure suppression water tank and the expansion tank and the containment shell;

[0031] The expansion cabin is connected to the filter cabin through the second discharge valve, and the filter cabin includes a steam-water separator and a metal fiber filter layer, which is used to capture the most penetrating particle size aerosol that is difficult to remove by water washing; the filter cabin is connected to the air cooler through a condensate return pipeline; the passive waste heat discharge water tank is connected to the condensate return pipeline through the second stop valve;

[0032] The radioactivity monitor is used to monitor the radioactivity dose released into the environment and the filtering ability of the system for radioactive substances. A bursting membrane structure is arranged between the radioactivity monitor and the air cooler.

[0033] When the pressure in the first-level pressure suppression water tank, the second-level pressure suppression water tank and the expansion tank is higher than the containment pressure, the first stop valve is opened to relieve the pressure in the first-level pressure suppression water tank, the second-level pressure suppression water tank and the expansion tank; when the pressure in the containment is higher than the pressure in the first-level pressure suppression water tank and the second-level pressure suppression water tank, the first-level pressure suppression water tank and the second-level pressure suppression water tank realize the pressure suppression and water washing functions.

[0034] In the embodiment of the present invention, after a LOCA accident occurs in the containment, when the pressure in the containment reaches the opening pressure of the first discharge valve, the first discharge valve automatically opens, and the steam-air mixture in the containment enters the first pressure suppression water tank through bubbling of the nozzle, and the containment is rapidly depressurized by means of efficient heat exchange of direct contact condensation by bubbling, thereby reducing the peak pressure of the containment in the early stage of the accident; the containment pressure suppression filtering and discharge system adopts two-stage bubbling water washing, which increases the submergence depth of the suppression nozzle, significantly increases the residence time of the gas in the liquid phase, and effectively improves the removal efficiency of airborne radioactive substances.

[0035] In an embodiment of the present invention, a parallel pipeline with a stop valve is provided on the pipeline where the bursting membrane structure is located, so as to manually open the stop valve on the parallel pipeline when the bursting membrane structure fails to open.

[0036] In one embodiment of the present invention, the opening pressure of the bursting membrane structure is the same as the opening pressure of the second discharge valve. When the pressure of the first-stage pressure suppression water tank, the second-stage pressure suppression water tank and the expansion tank reaches the opening pressure of the second discharge valve, the second discharge valve and the bursting membrane structure are opened successively to achieve the filtered discharge of the high-temperature and high-pressure gas in the containment, the first-stage pressure suppression water tank, the second-stage pressure suppression water tank and the expansion tank. A parallel pipeline is set in the pipeline where the bursting membrane structure is located. When the bursting membrane structure fails to open, the second stop valve on the parallel pipeline can be opened manually.

[0037] In one embodiment of the present invention, the discharge pipeline of the system is provided with a flow-limiting orifice plate for limiting the discharge flow rate, one end of the flow-limiting orifice plate is connected to the radioactivity monitor, and the other end is connected to the bursting membrane structure.

[0038] In one embodiment of the present invention, the first-stage pressure suppression water tank and the second-stage pressure suppression water tank are respectively loaded with a mixed solution for absorbing iodine in the exhaust gas, including:

[0039] The mixed solution is a mixed solution of sodium hydroxide iodide and sodium thiosulfate, and the mixed solution absorbs iodine in the exhaust gas through a chemical reaction.

[0040] In one embodiment of the present invention, a silver zeolite filter for effectively removing methyl iodide in the exhaust gas is arranged downstream of the metal fiber filter layer to reduce the radioactivity of the exhaust gas.

[0041] In one embodiment of the present invention, the air cooler is arranged horizontally and tilted downward, and the condensation rate of the air cooler is controlled by an adjustable damper of a chimney air duct arranged above the air cooler.

[0042] In one embodiment of the present invention, the system further comprises: a high-pressure medicine replenishing device;

[0043] The high-pressure medicine replenishing device is used to add sodium hydroxide and sodium sulfate solution into the filtering chamber to compensate for the concentration change of the water washing liquid in the filtering chamber caused by evaporation.

[0044] In the embodiment of the present invention, a multi-stage bubbling pressure-suppressing water washing scheme is adopted, which can make full use of the water resources in the pressure-suppressing water tank, and realize the rapid pressure suppression of the containment and the efficient retention of airborne radioactive substances under limited resource conditions. The scheme uses the existing cabin to set up a static mixer and a metal fiber filter layer, which can further improve the filtration efficiency of airborne radioactive substances and reduce the excessive occupation of overall resources. By setting an air cooler on the filter discharge pipeline to condense the exhaust steam, the condensate returns to the filter cabin with the help of the gravity difference, and the long-term passive and effective operation of the water scrubber can be achieved.

[0045] In the embodiment of the present invention, the excess condensate generated by air cooling of filtered exhaust steam can flow into the passive waste heat removal water tank as a heat sink of the passive waste heat removal system, taking away the heat released by the primary circuit, extending the effective operation time of the system, and alleviating the consequences of the accident. By setting up a variety of radioactive removal means in series, including two-stage bubbling water washing, static mixer cutting bubbles, high-efficiency metal fiber filtration, silver zeolite filtration, etc., it is possible to achieve efficient removal of airborne radioactive substances (aerosols, inorganic iodine and organic iodine), and reduce the radioactive impact of containment overpressure discharge on the environment under severe accident conditions.

[0046] In another embodiment of the present invention, a containment pressure suppression filtering and discharge system for a floating nuclear power platform includes: a containment 1, a first discharge valve 2, a second discharge valve 8, a first discharge pipeline 3, a first nozzle 4, a second nozzle 10, a first-stage pressure suppression water tank 5, a second-stage pressure suppression water tank 6, an expansion tank 7, a filter compartment 9, a static mixer 11, a steam-water separator 12, a metal fiber filter layer 13, a silver zeolite filter 15, an air cooler 16, a chimney duct 17, an adjusting damper 18, a condensate return pipeline 19, a passive residual heat discharge water tank 21, a high-pressure replenishing device 22, a bursting membrane structure 24, a flow limiting orifice 26, a radioactivity monitor 27, a first stop valve 14 and a second stop valve 19 / 21 / 23 / 25.

[0047] Under normal operating conditions, the first stop valve 14 and the second stop valve 19 / 21 / 23 / 25 are all in a closed state. The entire containment pressure suppression filter exhaust system is filled with nitrogen to reduce the risk of hydrogen explosion in the system under accident conditions.

[0048] When a LOCA accident occurs in the primary circuit of the containment 1, the containment pressure rises to the opening pressure of the first discharge valve 2, and the first discharge valve 2 opens. The high-temperature and high-pressure steam-air mixture in the containment 1 first enters the first-stage suppression water tank 5 through the first discharge pipe 3 and the first nozzle 4. With the efficient heat exchange of bubbling direct contact condensation, the containment 1 is rapidly depressurized, thereby reducing the pressure peak of the containment at the initial stage of the accident.

[0049] The first-stage pressure suppression water tank 5 and the second-stage pressure suppression water tank 6 are loaded with a mixed solution of sodium hydroxide and sodium thiosulfate, which can absorb iodine in the exhaust gas through chemical reactions. During the bubbling water washing in the first-stage pressure suppression water tank 5, the gas at the nozzle outlet is in a high-speed jet state, and the liquid phase is entrained into the gas plume to form a large number of entrained droplets. Aerosols are captured and removed by entrained droplets through capture mechanisms such as inertial collision, interception, and Brownian diffusion, and radioactive iodine is absorbed by the entrained droplets. At the same time, the steam share of the exhaust gas is high, and steam condensation will also significantly improve the removal efficiency of aerosols. As the energy of the exhaust gas dissipates, the gas flow pattern changes from a jet to a bubble group. The radioactive substance diffuses and migrates in the bubble to the bubble surface and is then retained by the liquid phase. After bubbling condensation in the first-stage pressure suppression water tank, the exhaust gas mainly remains non-condensable gas. The exhaust gas enters the second-stage pressure suppression water tank 6 for bubbling water washing. The exhaust gas after two stages of bubbling condensation and water washing enters the expansion tank 7.

[0050] The opening pressure of the bursting membrane structure 24 downstream of the air cooler 16 is the same as the opening pressure of the second discharge valve 8. When the pressure of the first-stage pressure suppression water tank 5, the second-stage pressure suppression water tank 6, and the expansion tank 7 reaches the opening pressure of the second discharge valve 8, the second discharge valve 8 and the bursting membrane 24 are opened successively to achieve the filtered discharge of the high-temperature and high-pressure gas in the containment 1, the first-stage pressure suppression water tank 5, the second-stage pressure suppression water tank 6, and the expansion tank 7. A parallel pipeline is set in the pipeline where the bursting membrane structure 24 is located. When the bursting membrane fails to open, the second stop valve 25 on the parallel pipeline can be opened manually.

[0051] High-temperature and high-pressure gas enters the filter chamber 9, which is loaded with a mixed solution of sodium hydroxide and sodium thiosulfate. The exhaust gas is bubbled into the water wash liquid through the nozzle 10. Under the action of the static mixer 11, large bubbles are cut into smaller bubbles, thereby improving the water washing efficiency of the radioactive material. After the water washing and filtration at the bottom, the exhaust gas reaches the metal fiber filter layer 13 arranged at the top of the chamber through the steam-water separator 12, so as to capture the most penetrating particle size aerosol that is difficult to remove by water washing. A silver zeolite filter 15 is arranged downstream of the fiber filter layer to effectively remove methyl iodide in the exhaust gas and further reduce the radioactive activity of the exhaust gas.

[0052] After passing through the silver zeolite filter 15, the exhaust gas enters the air cooler 16. The air cooler 16 is arranged horizontally and tilted downward, and the exhaust gas is condensed by the air outside the tube. The air flows vertically upward and sweeps across the heat exchange tube of the air cooler 16. After the air is heated, the density decreases and it flows by the suction force of the chimney duct 17. The condensate returns to the filter compartment 9 with the help of the gravity difference. At the same time, sodium hydroxide and sodium sulfate solution are added to the filter compartment through the high-pressure replenishing device 22 to compensate for the concentration change of the water washing liquid in the filter compartment caused by evaporation. The excess condensate can flow into the non-active waste heat discharge water tank 21 to extend the effective operation time of the system and alleviate the consequences of accidents. The condensation rate of the air cooler can be controlled by the regulating damper 18 of the chimney duct 17.

[0053] A flow limiting orifice 26 is provided on the filter discharge pipeline to limit the discharge flow rate, ensure that the discharge flow rate is substantially consistent with the system design flow rate over a period of time, and ensure the filtering efficiency of the system. A radioactivity monitor 27 is used to monitor the radioactive dose released into the environment, and can also be used to monitor the system's filtering ability for radioactive substances.

[0054] With the commissioning of other dedicated safety systems, when the pressure in the first-stage pressure suppression water tank 5, the second-stage pressure suppression water tank 6 or the expansion tank 7 is higher than the pressure in the containment shell 1, the first stop valve 14 is opened to relieve the pressure in the pressure suppression water tank and the expansion tank. When the pressure in the containment shell 1 is higher than the pressure in the first-stage pressure suppression water tank 5 and the second-stage pressure suppression water tank 6 again, the first-stage pressure suppression water tank 5 and the second-stage pressure suppression water tank 6 realize the pressure suppression and water washing functions again.

[0055] In another embodiment of the present invention, the system is configured to include at least a two-stage bubbling water washing structure, a static mixer cutting bubble structure, a high-efficiency metal fiber filtration structure and a silver zeolite filtration structure, which are connected in series to remove radioactive substances including aerosols, inorganic iodine and organic iodine airborne radioactive substances.

[0056] Excess condensate generated by air cooling of filtered exhaust steam in the system flows into the passive waste heat removal water tank, which serves as a heat sink of the passive waste heat removal system to take away the heat released by a circuit and extend the effective operation time of the system.

[0057] The technical solution of the present invention is a containment pressure suppression filtration and discharge system for a floating nuclear power platform, comprising: a containment, a first discharge valve, a first discharge pipeline, a first nozzle, a first-stage pressure suppression water tank, a second-stage pressure suppression water tank, an expansion tank, a second discharge valve, a filter compartment, a second nozzle, an air cooler, a radioactivity monitor, a passive residual heat discharge water tank, a first stop valve and a second stop valve. When the pressure in the first-stage pressure suppression water tank, the second-stage pressure suppression water tank and the expansion tank is higher than the pressure in the containment, the first stop valve is opened to release the pressure. When the pressure in the containment is higher than the pressure in the first-stage pressure suppression water tank and the second-stage pressure suppression water tank, the first-stage pressure suppression water tank and the second-stage pressure suppression water tank realize the pressure suppression and water washing functions. It can meet the needs of rapid pressure reduction of the containment after an accident of a floating nuclear power platform and efficient removal of radioactive substances, and solve the problem of water washing liquid reduction after long-term operation of the existing nuclear power filtration and discharge device.

[0058] The present invention can achieve efficient removal of airborne radioactive substances (aerosol, inorganic iodine and organic iodine) by setting up a variety of radioactive removal means in series, including two-stage bubbling water washing, static mixer cutting bubbles, high-efficiency metal fiber filtration, silver zeolite filtration, etc., and reduce the radioactive impact of containment overpressure discharge on the environment under severe accident conditions. By setting an air cooler on the filter discharge pipeline to condense the discharge steam, the condensate returns to the filter compartment by means of gravity head difference, and the long-term passive and effective operation of the water scrubber can be achieved.

[0059] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A containment suppression filtration and drainage system for a floating nuclear power platform, characterized in that: The system comprises: a containment shell, a first discharge valve, a first discharge pipeline, a first nozzle, a first-stage pressure suppression water tank, a second-stage pressure suppression water tank, an expansion tank, a second discharge valve, a filter compartment, a second nozzle, an air cooler, a radioactivity monitor, a passive residual heat discharge water tank, a first stop valve, and a second stop valve; The containment shell is connected to the first-stage pressure suppression water tank through the first discharge valve, the first discharge pipe and the first nozzle, and the first-stage pressure suppression water tank is connected to the second-stage pressure suppression water tank through the second discharge pipe and the first nozzle; the first-stage pressure suppression water tank and the second-stage pressure suppression water tank are respectively loaded with a mixed solution for absorbing iodine in the discharge gas; the first stop valve is arranged between the first-stage pressure suppression water tank and the expansion tank and the containment shell; The expansion cabin is connected to the filter cabin through the second discharge valve, and the filter cabin includes a steam-water separator and a metal fiber filter layer, which is used to capture the most penetrating particle size aerosol that is difficult to remove by water washing; the filter cabin is connected to the air cooler through a condensate return pipeline; the passive waste heat discharge water tank is connected to the condensate return pipeline through the second stop valve; The radioactivity monitor is used to monitor the radioactivity dose released into the environment and the filtering ability of the system for radioactive substances. A bursting membrane structure is arranged between the radioactivity monitor and the air cooler. When the pressure in the first-level pressure suppression water tank, the second-level pressure suppression water tank and the expansion tank is higher than the containment pressure, the first stop valve is opened to relieve the pressure in the first-level pressure suppression water tank, the second-level pressure suppression water tank and the expansion tank; when the pressure in the containment is higher than the pressure in the first-level pressure suppression water tank and the second-level pressure suppression water tank, the first-level pressure suppression water tank and the second-level pressure suppression water tank realize the pressure suppression and water washing functions.

2. A containment pressure suppression filtration and drainage system for a floating nuclear power platform according to claim 1, characterized in that: The system is configured to include at least a two-stage bubbling water washing structure, a static mixer cutting bubble structure, a high-efficiency metal fiber filtration structure and a silver zeolite filtration structure in series with a radioactive removal device, which is used to remove airborne radioactive substances including aerosols, inorganic iodine and organic iodine.

3. The containment pressure suppression filtration and drainage system for a floating nuclear power platform according to claim 1, characterized in that: The opening pressure of the bursting membrane structure is the same as the opening pressure of the second discharge valve. The pipeline where the bursting membrane structure is located is provided with a parallel pipeline with a stop valve, which is used to manually open the stop valve on the parallel pipeline when the bursting membrane structure fails to open.

4. The containment pressure suppression filtration and drainage system for a floating nuclear power platform according to claim 1, characterized in that: The discharge pipeline of the system is provided with a flow-limiting orifice plate for limiting the discharge flow rate, one end of the flow-limiting orifice plate is connected to the radioactivity monitor, and the other end is connected to the bursting membrane structure.

5. The containment suppression filtration and drainage system for a floating nuclear power platform according to claim 1, characterized in that: The first-stage pressure suppression water tank and the second-stage pressure suppression water tank are respectively loaded with a mixed solution for absorbing iodine in the exhaust gas, including: The mixed solution is a mixed solution of sodium hydroxide iodide and sodium thiosulfate, and the mixed solution absorbs iodine in the exhaust gas through a chemical reaction.

6. The containment suppression filtration and drainage system for a floating nuclear power platform according to claim 1, characterized in that: A silver zeolite filter for effectively removing methyl iodide in the exhaust gas is arranged downstream of the metal fiber filter layer to reduce the radioactivity of the exhaust gas.

7. The containment suppression filtration and drainage system for a floating nuclear power platform according to claim 1, characterized in that: Excess condensate generated by air cooling of filtered exhaust steam in the system flows into the passive waste heat removal water tank, which serves as a heat sink of the passive waste heat removal system to take away the heat released by a circuit and extend the effective operation time of the system.

8. A containment pressure suppression filtration and drainage system for a floating nuclear power platform according to any one of claims 1 to 7, characterized in that: The air cooler is arranged horizontally and tilted downward, and the condensation rate of the air cooler is controlled by an adjustable damper of a chimney air duct arranged above the air cooler.

9. The containment suppression filtration and drainage system for a floating nuclear power platform according to claim 1, characterized in that: The system further includes: a high-pressure medicine replenishing device; The high-pressure medicine replenishing device is used to add sodium hydroxide and sodium sulfate solution into the filtering chamber to compensate for the concentration change of the water washing liquid in the filtering chamber caused by evaporation.

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