Ventilation system for habitable area of main control room of nuclear power plant

Abstract

The application discloses a ventilation system for a habitable area of a main control room of a nuclear power plant, which comprises a normal exhaust pipeline connected with the habitable area, an indoor air supplement pipeline, two ventilation pipelines, a first isolation valve, and a control platform electrically connected with the first isolation valve, the normal exhaust pipeline, the indoor air supplement pipeline and the two ventilation pipelines; the control platform controls the two ventilation pipelines to work in cooperation with the normal exhaust pipeline, the indoor air supplement pipeline and the first isolation valve according to air radioactive contamination data parameters, so as to control the switching of air input modes, the switching of air sources between the two ventilation pipelines, and the air pressure of the habitable area being greater than that of an atmospheric environment; the air input modes include a normal air input mode, an emergency air input mode, an internal circulation mode and a device fault replacement mode. The application can ensure the air safety of the habitable area, and can make the habitable area maintain a positive pressure relative to the atmospheric environment, so as to avoid the leakage of outdoor high-radioactive air into the habitable area.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant ventilation technology, and in particular to a ventilation system for habitable areas in the main control room of a nuclear power plant. Background Technology

[0002] In related technologies, the normal and emergency fresh air inlets of the ventilation system in the habitable area of ​​the main control room of a nuclear power plant are separate, and a large number of fresh air inlets need to be set up, which increases the difficulty of plant layout design and the construction cost of nuclear power plants. Under the operating conditions of nuclear power plant accidents, the fresh air inlets cannot be flexibly switched according to the degree of air radioactive contamination, and it is not possible to switch from fresh air inlets with high radioactive air contamination to those with low contamination. This is not conducive to supplying relatively low radioactive air contamination to the habitable area of ​​the main control room (hereinafter referred to as the habitable area). Furthermore, when supplying air to the habitable area, the ventilation system ignores the factor of the pressure difference between the indoor and outdoor air in the habitable area. As a result, if there is no additional air supply, the positive pressure of the habitable area relative to the outdoor atmosphere cannot be maintained for a long time, which cannot prevent high radioactive air contamination from the outside from leaking into the habitable area, thus reducing the radiation safety of the staff in the habitable area. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a ventilation system for habitable areas in the main control room of a nuclear power plant.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to construct a ventilation system for the habitable area of ​​the main control room of a nuclear power plant, including a normal exhaust duct, an indoor air supply duct and two ventilation ducts connected to the habitable area, a first isolation valve, and a control platform electrically connected to the first isolation valve, the normal exhaust duct, the indoor air supply duct and the two ventilation ducts;

[0005] The control platform controls the two ventilation ducts, the normal exhaust duct, the indoor air supply duct, and the first isolation valve to work together based on air radioactive pollution data parameters, in order to control the switching of air input modes and the switching of air sources between the two ventilation ducts, and to ensure that the air pressure in the habitable area is greater than the atmospheric pressure; the air input modes include normal air input mode, emergency air input mode, internal circulation mode, and equipment failure replacement mode.

[0006] Preferably, the indoor air supply pipeline includes a compressed air tank and a flow regulating valve;

[0007] The compressed air tank is connected to one end of the flow regulating valve, and the other end of the flow regulating valve is connected to the habitable area;

[0008] The control platform is electrically connected to the flow regulating valve. In the internal circulation mode, the control platform controls the air flow of the flow regulating valve according to the indoor air pressure of the habitable area to replenish the habitable area with air, so that the air pressure in the habitable area is kept higher than the outdoor atmospheric pressure.

[0009] Preferably, the normal exhaust duct includes an exhaust fan, a second isolation valve, and an exhaust outlet;

[0010] The first end of the exhaust fan is connected to the habitable area, and the second end of the exhaust fan is connected to the exhaust port via the second isolation valve. The exhaust port is connected to the atmospheric environment.

[0011] The control platform is electrically connected to the exhaust fan and the second isolation valve. When the normal exhaust duct needs to be closed, the control platform controls the exhaust fan and the second isolation valve to close. When the normal exhaust duct needs to be opened, the control platform controls the exhaust fan and the second isolation valve to open, so that the air in the habitable area is discharged into the atmosphere.

[0012] Preferably, each of the ventilation ducts includes an air supply circuit, a fresh air inlet for inputting normal fresh air or emergency fresh air, a third isolation valve connected between the outlet of the fresh air inlet and the inlet of the air supply circuit for controlling whether fresh air is input, a first monitoring unit connected to the inlet of the fresh air inlet for monitoring the concentration of radioactive gas, and a second monitoring unit connected to the outlet of the air supply circuit for monitoring the concentration of aerosol radioactivity and iodine radioactivity.

[0013] The control platform is electrically connected to the third isolation valve and the air supply circuit to control the third isolation valve and the air supply circuit to work together, thereby realizing the switching of the normal air input mode, emergency air input mode and internal circulation mode;

[0014] The control platform is also electrically connected to the first monitoring unit and the second monitoring unit to obtain the radioactive gas concentration, aerosol radioactive concentration and iodine radioactive concentration, and then determine the air input mode to be switched based on the radioactive gas concentration, aerosol radioactive concentration and iodine radioactive concentration.

[0015] The first isolation valve is connected to the air inlet of the air supply circuit in the two ventilation ducts respectively. In the equipment failure replacement mode, the control platform controls the first isolation valve to open so that one of the ventilation ducts can replace the other ventilation duct to perform the normal air input mode, emergency air input mode or internal circulation mode.

[0016] Preferably, the control platform uses the average concentration of radioactive gas collected by the first monitoring unit of each of the two ventilation ducts within a second set time period as the basis for switching the air source.

[0017] Preferably, it also includes an audible and visual alarm and two gamma dose rate monitors disposed in a fresh air inlet included in one of the ventilation ducts for monitoring the air gamma dose rate;

[0018] The control platform is electrically connected to the audible and visual alarm and two gamma dose rate monitors. When the gamma dose rate is greater than the alarm threshold, the control platform controls the audible and visual alarm to sound an alarm, and controls the first monitoring unit and the second monitoring unit to turn on, entering the emergency wind input mode.

[0019] Preferably, the first monitoring unit includes a fourth isolation valve, a first dryer, an aerosol and iodine filter, a first gas sampling pump, and an inert gas monitor;

[0020] The first end of the fourth isolation valve is connected to the air inlet of the fresh air inlet, and the second end of the fourth isolation valve is connected to the inert gas monitor via the first dryer, the aerosol and iodine filter and the first gas sampling pump.

[0021] The control platform is electrically connected to the fourth isolation valve and the first gas sampling pump to control the opening of the fourth isolation valve and the first gas sampling pump, thereby enabling the inert gas monitor to detect the inert gas radioactivity concentration at the air inlet of the fresh air inlet.

[0022] Preferably, the second monitoring unit includes a fifth isolation valve, a second dryer, a second gas sampling pump, an aerosol radioactivity concentration monitor, and an iodine radioactivity concentration monitor;

[0023] The first end of the fifth isolation valve is connected to the air outlet of the air supply circuit, and the second end of the fifth isolation valve is connected to the iodine radioactivity concentration monitor via the second dryer, the second gas sampling pump and the aerosol radioactivity concentration monitor.

[0024] The control platform is electrically connected to the fifth isolation valve and the second gas sampling pump to control the opening of the fifth isolation valve and the second gas sampling pump, thereby enabling the aerosol radioactivity concentration monitor and the iodine radioactivity concentration monitor to detect the aerosol radioactivity concentration and the iodine radioactivity concentration at the air outlet of the air supply circuit, respectively.

[0025] Preferably, the air supply circuit includes an electric heater, a first filter unit, a sixth isolation valve, a second filter unit, and a return air unit;

[0026] The first end of the electric heater corresponds to the air inlet of the air supply circuit. The second end of the electric heater is connected to the air inlet of the first filter unit and the first end of the sixth isolation valve. The air outlet of the first filter unit and the second end of the sixth isolation valve are connected to the air inlet of the second filter unit. The air outlet of the second filter unit corresponds to the air outlet of the air supply circuit. The two ends of the return air unit are respectively connected to the first end of the electric heater and the habitable area.

[0027] The control platform is electrically connected to the first filter unit, the sixth isolation valve, the second filter unit, and the return air unit to control the first filter unit, the sixth isolation valve, the second filter unit, and the return air unit to work together, thereby realizing the switching of the air input mode.

[0028] Preferably, in the emergency air input mode, the control platform controls: the normal exhaust duct to be closed, one ventilation duct including the third isolation valve and the first filter unit, sixth isolation valve, second filter unit and return air unit in the air supply circuit to be closed, the other ventilation duct including the third isolation valve to be opened and the sixth isolation valve in the air supply circuit to be closed, the first filter unit, second filter unit and return air unit to be opened, so that air is input to the habitable area through the electric heater, first filter unit and second filter unit of the other ventilation duct;

[0029] In the normal air input mode, the control platform controls the following: the normal exhaust duct is opened, one ventilation duct including the third isolation valve and the first filter unit, sixth isolation valve, second filter unit and return air unit in the air supply circuit are closed, the other ventilation duct including the third isolation valve is opened and the first filter unit and return air unit in the air supply circuit are closed, and the sixth isolation valve and second filter unit are opened, so that air is input to the habitable area through the electric heater, sixth isolation valve and second filter unit of the other ventilation duct, and exhaust is output through the normal exhaust duct;

[0030] In the internal circulation mode, the control platform controls the following: the normal exhaust duct is closed; one ventilation duct includes a third isolation valve and the first filter unit, sixth isolation valve, second filter unit, and return air unit in the air supply circuit are closed; the other ventilation duct includes a third isolation valve and the sixth isolation valve in the air supply circuit are closed, and the return air unit, first filter unit, and second filter unit are opened, so that the air in the habitable area of ​​the main control room is processed by the return air unit, electric heater, first filter unit, and second filter unit of the other ventilation duct and then returned to the habitable area of ​​the main control room to achieve internal air circulation.

[0031] Preferably, the first filtration unit includes a seventh isolation valve, a high-efficiency filter group, a pressurizing fan, and an eighth isolation valve;

[0032] The first end of the seventh isolation valve corresponds to the air inlet of the first filter unit, and the second end of the seventh isolation valve is connected to the first end of the eighth isolation valve via the high-efficiency filter group and the pressurized fan. The first end of the eighth isolation valve corresponds to the air outlet of the first filter unit.

[0033] The control platform is electrically connected to the seventh isolation valve, the pressurizing fan, and the eighth isolation valve. When the first filtration unit needs to be turned on, the control platform controls the seventh isolation valve, the pressurizing fan, and the eighth isolation valve to turn on; when the first filtration unit needs to be turned off, the control platform controls the seventh isolation valve, the pressurizing fan, and the eighth isolation valve to turn off. The control platform also controls the air intake of the pressurizing fan to make the air pressure in the habitable area greater than the atmospheric pressure.

[0034] Preferably, the high-efficiency filter assembly includes a first pre-filter, a first aerosol high-efficiency filter, an iodine filter, and a second aerosol high-efficiency filter;

[0035] The second end of the seventh isolation valve is connected to the pressurizing blower via the first pre-filter, the first aerosol HEPA filter, the iodine filter, and the second aerosol HEPA filter.

[0036] Preferably, in the emergency air input mode, the pressure difference between the habitable area and the ambient air pressure is maintained within a first set pressure range.

[0037] Preferably, the first set air pressure range is 30Pa to 80Pa.

[0038] Preferably, the second filtration unit includes an air filter, a cooling coil, a humidifier, and a blower.

[0039] The first end of the air filter device corresponds to the air inlet of the second filter unit, the second end of the air filter device is connected to the first end of the air supply fan via the cooling coil and the humidifier, and the second end of the air supply fan corresponds to the air outlet of the second filter unit.

[0040] The control platform is electrically connected to the air supply fan. When the second filtration unit needs to be turned on, the control platform controls the air supply fan to turn on; when the second filtration unit needs to be turned off, the control platform controls the air supply fan to turn off. In the normal air input mode, the control platform also controls the air intake of the air supply fan to be greater than the exhaust air intake of the exhaust fan, so that the air pressure in the habitable area is greater than the atmospheric pressure.

[0041] Preferably, in the normal wind input mode, the pressure difference between the habitable area and the ambient air pressure is maintained within a second set pressure range.

[0042] Preferably, the second set pressure range is 80Pa to 150Pa.

[0043] Preferably, the return air unit includes a ninth isolation valve;

[0044] The two ends of the ninth isolation valve are respectively connected to the first end of the electric heater and the habitable area;

[0045] The control platform is electrically connected to the ninth isolation valve. When the return air unit needs to be opened, the control platform controls the ninth isolation valve to open; when the return air unit needs to be closed, the control platform controls the ninth isolation valve to close.

[0046] The technical solution of this invention determines the level of air radioactivity pollution in the atmosphere of the nuclear power plant area based on air radioactivity pollution data parameters through a control platform. This allows for flexible coordination between two ventilation ducts, normal exhaust ducts, indoor air supply ducts, and the first isolation valve. Appropriate ventilation ducts are selected as the air input source, and the ventilation system operates in a suitable air input mode. This ensures that the level of air radioactivity pollution in the habitable area remains within a controllable range even under various accident conditions at the nuclear power plant, and that the habitable area maintains a positive pressure relative to the outdoor atmosphere. This prevents high-radioactivity outdoor air from leaking into the habitable area, ensuring the radiation safety of personnel located in the habitable area. Attached Figure Description

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0048] Figure 1 This is a schematic diagram of the ventilation system of the habitable area in the main control room of a nuclear power plant in some embodiments of the present invention;

[0049] Figure 2 This is a structural schematic diagram of the ventilation system for the habitable area of ​​the main control room of a nuclear power plant in some other embodiments of the present invention. Detailed Implementation

[0050] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "up," "down," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0052] like Figure 1 The diagram shown is a structural schematic of the ventilation system for the habitable area of ​​the main control room of a nuclear power plant in some embodiments of the present invention. The ventilation system includes a normal exhaust duct 101 connected to the habitable area, an indoor air supply duct 102 and two ventilation ducts 103, a first isolation valve 29, and a control platform electrically connected to the first isolation valve 29, the normal exhaust duct 101, the indoor air supply duct 102 and the two ventilation ducts 103.

[0053] The control platform controls the two ventilation ducts 103 to work in coordination with the normal exhaust duct 101, the indoor air supply duct 102, and the first isolation valve 29 based on radioactive contamination data parameters. This controls the switching of air input modes and the switching of air sources between the two ventilation ducts 103, as well as ensuring that the air pressure in the habitable area is greater than the atmospheric pressure. The air input modes include normal air input mode, emergency air input mode, internal circulation mode, and equipment failure replacement mode.

[0054] Radioactive pollution data are used to characterize the degree of airborne radioactive pollution in the atmospheric environment. Radioactive pollution data includes, but is not limited to, the concentration of radioactive gases, the concentration of radioactive aerosols, the concentration of radioactive iodine, and the gamma dose rate.

[0055] The normal air input mode is suitable for situations where the air in the atmospheric environment is free of radioactive pollution or has a low level of radioactive pollution. This mode obtains outdoor air from the atmospheric environment, filters out the dust particles in the air, and then inputs it into the habitable area to provide clean air for the habitable area.

[0056] The emergency air input mode is suitable for situations where the level of radioactive pollution in the atmospheric environment is moderate. This mode takes a small amount of air from the atmospheric environment, performs a higher level of filtration treatment on the air than the normal air input mode (filtering out radioactive aerosols and iodine in the air), and then introduces it into the habitable area. Compared with the normal air input mode, the emergency air input mode filters out radioactive aerosols and iodine in the air.

[0057] The internal circulation mode is suitable for situations where the atmospheric environment has a high degree of air pollution. This mode does not draw air from the atmospheric environment. The air circulates within the habitable area and also replenishes the habitable area with pre-stored clean air as needed to prevent outdoor radioactive contaminated air from leaking into the habitable area.

[0058] The equipment failure replacement mode is applicable when any component or equipment in either of the two ventilation ducts 103 fails. By controlling the opening of the first isolation valve 29, the ventilation duct 103 that has not experienced component or equipment failure can replace the other ventilation duct 103 to ensure the continuous operation of the ventilation system.

[0059] The control platform is an electronic control platform that controls the working logic of the ventilation system. It can be a host computer, a computer, or a DCS system, etc.

[0060] The two ventilation ducts 103 have air inlets located at different positions. The presence of two ventilation ducts 103 allows the control platform to select the duct 103 with the lower level of radioactive contamination as the air input source for the ventilation system based on radioactive contamination data, thus enabling air source switching. Furthermore, both ventilation ducts 103 can serve as input sources for both emergency and normal airflow.

[0061] In some embodiments, such as Figure 2 As shown, the indoor air supply line 102 includes a compressed air tank 50 and a flow regulating valve 51.

[0062] Compressed air tank 50 is connected to one end of flow regulating valve 51, and the other end of flow regulating valve 51 is connected to the habitable area. The control platform is electrically connected to flow regulating valve 51. In internal circulation mode, the control platform controls the air flow of flow regulating valve 51 according to the indoor air pressure of the habitable area to replenish air to the habitable area so that the air pressure in the habitable area is kept higher than the outdoor atmospheric pressure.

[0063] Compressed air tank 50 is used to store clean air. In this embodiment, in the internal circulation mode, the habitable area cannot obtain air from the outside. Therefore, the control platform can control the flow rate of the flow regulating valve 51 according to the indoor and outdoor air pressure of the habitable area, so that the compressed air tank 50 can replenish the indoor air and maintain the air pressure of the habitable area relative to the atmospheric environment within a certain pressure difference range (generally greater than 30 Pa), so as to avoid the air in the habitable area from being lost to the outdoor atmospheric environment too quickly.

[0064] In some embodiments, such as Figure 2 As shown, the normal exhaust duct 101 includes an exhaust fan 52, a second isolation valve 53, and an exhaust outlet. The exhaust fan 52 provides the power required for normal exhaust.

[0065] The first end of the exhaust fan 52 is connected to the normal air outlet of the habitable area, and the second end of the exhaust fan 52 is connected to the exhaust port via the second isolation valve 53. The exhaust port is connected to the atmospheric environment. The control platform is electrically connected to the exhaust fan 52 and the second isolation valve 53. When the normal exhaust duct 101 needs to be closed, the control platform controls the exhaust fan 52 and the second isolation valve 53 to close, so as to isolate the habitable area from the atmospheric environment and prevent air from the atmospheric environment from leaking into the habitable area. When the normal exhaust duct 101 needs to be opened, the control platform controls the exhaust fan 52 and the second isolation valve 53 to open, so that the air in the habitable area is discharged into the atmospheric environment.

[0066] In some embodiments, such as Figure 2 As shown, each ventilation duct 103 includes an air supply circuit 1031, a fresh air inlet 1032 for inputting normal or emergency fresh air, a third isolation valve 3 connected between the outlet of the fresh air inlet 1032 and the inlet of the air supply circuit 1031 for controlling whether fresh air is input, a first monitoring unit 1033 connected to the inlet of the fresh air inlet 1032 for monitoring the concentration of radioactive gases, and a second monitoring unit 1034 connected to the outlet of the air supply circuit 1031 for monitoring the concentration of aerosol radioactivity and iodine radioactivity. The control platform is electrically connected to the third isolation valve 3 and the air supply circuit 1031 to control the third isolation valve 3 and the air supply circuit 1031 to work together, thereby realizing the normal air input mode. The control platform is also electrically connected to the first monitoring unit 1033 and the second monitoring unit 1034 to obtain the radioactive gas concentration, aerosol radioactive concentration and iodine radioactive concentration, and then determine the air input mode to be switched based on the radioactive gas concentration, aerosol radioactive concentration and iodine radioactive concentration; the two ends of the first isolation valve 29 are respectively connected to the air inlet of the air supply circuit 1031 in the two ventilation ducts 103. In the equipment failure replacement mode, the control platform controls the first isolation valve 29 to open so that one of the ventilation ducts 103 can replace the other ventilation duct 103 to perform normal air input mode, emergency air input mode or internal circulation mode.

[0067] In this embodiment, the control platform can determine which fresh air inlet 1032 has a lower level of air radioactivity pollution by comparing the radioactive gas concentrations detected by the first monitoring unit 1033 included in the two ventilation ducts 103. This allows the ventilation duct 103 with the lower level of air radioactivity pollution to be selectively activated, resulting in a lower level of air radioactivity entering the habitable area. Specifically, refer to... Figure 2Within a second set time period, when the first monitoring unit 1033 at fresh air inlet B detects that the average concentration of radioactive gas is greater than that at fresh air inlet A, the control platform controls the ventilation duct 103 corresponding to fresh air inlet B to open. Conversely, when the first monitoring unit 1033 at fresh air inlet A detects that the average concentration of radioactive gas is greater than that at fresh air inlet B, the control platform controls the ventilation duct 103 corresponding to fresh air inlet B to open, thereby realizing the mutual switching between the two fresh air inlets 1032.

[0068] The redundant design of the second monitoring unit 1034 improves the safety and reliability of the ventilation system. The function of the second monitoring unit 1034 is to detect whether the air output from the air supply circuit 1031 meets the requirements. If the aerosol radioactivity concentration or iodine radioactivity concentration detected by a certain second monitoring unit 1034 exceeds the corresponding safety threshold for a duration exceeding a first set time, it indicates a high level of air pollution. If fresh air continues to be input from the fresh air inlet 1032, the radioactivity concentration of aerosols and iodine in the air output from the air supply circuit 1031 will further increase, further deteriorating the air quality. The normal air input mode and emergency air input mode will be prohibited, and the system will switch to internal circulation mode to prevent highly radioactive air from the factory area from entering habitable areas. Optionally, the first set time is 5 seconds.

[0069] In some embodiments, the control platform uses the average radioactive gas concentration collected by the first monitoring unit 1033 included in the two ventilation ducts 103 within a second set time period as a comparison basis. This can avoid the switching of the fresh air inlets 1032 (i.e., air sources) included in the two ventilation ducts 103 too frequently. Optionally, the second set time period is 10 minutes.

[0070] In some embodiments, such as Figure 2 As shown, the ventilation system for the habitable area of ​​the main control room of the nuclear power plant also includes an audible and visual alarm (not shown) and two gamma dose rate monitors 1 installed in the fresh air inlet 1032 of one of the ventilation ducts 103 for monitoring the air gamma dose rate.

[0071] The control platform is electrically connected to the audible and visual alarm and two gamma dose rate monitors 1. When the duration of the air gamma dose rate being greater than the alarm threshold exceeds the first set time, the control platform controls the audible and visual alarm to sound an alarm to alert the staff. The control platform also controls the first monitoring unit 1033 and the second monitoring unit 1034 to turn on and enter the emergency air input mode.

[0072] Specifically, in the initial stage of a nuclear power plant accident, the gamma dose rate in the atmospheric environment of the nuclear power plant area will increase. If the air gamma dose rate is less than the alarm threshold, it is generally considered that the degree of atmospheric pollution is low. At this time, the control platform will control the system to enter the normal air input mode. It is easy to understand that the gamma dose rate monitor will not only trigger audible and visual alarms, but also provide interlocking control signals for the activation of the first monitoring unit 1033 and the second monitoring unit 1034. A fresh air inlet 1032 equipped with a gamma dose rate monitor 1 (e.g., Figure 2 The fresh air inlet A shown can be the default air inlet in both normal air input mode and emergency air input mode, which facilitates monitoring of the level of radioactive pollution in the air entering the habitable area.

[0073] In some embodiments, such as Figure 2 As shown, the first monitoring unit 1033 includes a fourth isolation valve 30, a first dryer 31, an aerosol and iodine filter 32, a first gas sampling pump 33, and an inert gas monitor 34.

[0074] The first end of the fourth isolation valve 30 is connected to the air inlet of the fresh air inlet 1032, and the second end of the fourth isolation valve 30 is connected to the inert gas monitor 34 via the first dryer 31, the aerosol and iodine filter 32 and the first gas sampling pump 33. The control platform is electrically connected to the fourth isolation valve 30 and the first gas sampling pump 33 to control the opening of the fourth isolation valve 30 and the first gas sampling pump 33, thereby enabling the inert gas monitor 34 to detect the radioactive concentration of inert gas at the air inlet of the fresh air inlet 1032.

[0075] The first dryer 31 is used to reduce the humidity of the sampled gas, thereby reducing the likelihood of malfunction of the inert gas monitor 34 due to high gas humidity. The aerosol and iodine filter 32 reduces the content of radioactive aerosols and iodine in the sampled gas through high-efficiency filtration and activated carbon adsorption, avoiding interference from radioactive substances in gas monitoring and thus improving the accuracy of inert gas radioactivity measurement. The first gas sampling pump 33 is used to extract an appropriate amount of dried and filtered gas and deliver it to the inert gas monitor 34.

[0076] In some embodiments, such as Figure 2 As shown, the second monitoring unit 1034 includes a fifth isolation valve 40, a second dryer 41, a second gas sampling pump 42, an aerosol radioactivity concentration monitor 43, and an iodine radioactivity concentration monitor 44.

[0077] The first end of the fifth isolation valve 40 is connected to the air outlet of the air supply circuit 1031, and the second end of the fifth isolation valve 40 is connected to the iodine radioactivity concentration monitor 44 via the second dryer 41, the second gas sampling pump 42 and the aerosol radioactivity concentration monitor 43. The control platform is electrically connected to the fifth isolation valve 40 and the second gas sampling pump 42 to control the opening of the fifth isolation valve 40 and the second gas sampling pump 42, so that the aerosol radioactivity concentration monitor 43 and the iodine radioactivity concentration monitor 44 can respectively detect the aerosol radioactivity concentration and the iodine radioactivity concentration at the air outlet of the air supply circuit 1031.

[0078] The second dryer is used to reduce the humidity of the sampled gas, thereby reducing the likelihood of malfunctions in the aerosol radioactivity concentration monitor 43 and the iodine radioactivity concentration monitor 44 due to high gas humidity. The second gas sampling pump 42 is used to draw an appropriate amount of dried gas to the aerosol radioactivity concentration monitor 43 and the iodine radioactivity concentration monitor 44.

[0079] In some embodiments, such as Figure 2 As shown, the air supply circuit 1031 includes an electric heater 4, a first filter unit 2031, a sixth isolation valve 5, a second filter unit 2032, and a return air unit 2033.

[0080] The first end of the electric heater 4 corresponds to the air inlet of the air supply circuit 1031. The second end of the electric heater 4 is connected to the air inlet of the first filter unit 2031 and the first end of the sixth isolation valve 5. The air outlet of the first filter unit 2031 and the second end of the sixth isolation valve 5 are connected to the air inlet of the second filter unit 2032. The air outlet of the second filter unit 2032 corresponds to the air outlet of the air supply circuit 1031. The two ends of the return air unit 2033 are respectively connected to the first end of the electric heater 4 and the return air inlet of the habitable area. The control platform is electrically connected to the first filter unit 2031, the sixth isolation valve 5, the second filter unit 2032 and the return air unit 2033 to control the first filter unit 2031, the sixth isolation valve 5, the second filter unit 2032 and the return air unit 2033 to work together, thereby realizing the switching of the air input mode.

[0081] The electric heater 4 is used to heat the air and maintain the relative humidity below 70%, which helps to extend the service life of the first filter unit 2031 and the second filter unit 2032 and improve the filtration quality. The first filter unit 2031 and the second filter unit 2032 are used to filter the air. Specifically, the first filter unit 2031 can filter radioactive air for aerosol and iodine filtration, while the second filter unit 2032 can filter airborne dust. The return air unit 2033 is used to activate in emergency air input mode or internal recirculation mode.

[0082] In some embodiments, reference Figure 2The control platform switches the ventilation system to emergency air input mode through the following control methods: the normal exhaust duct 101 is closed, the third isolation valve 3 of one ventilation duct 103 and the first filter unit 2031, the sixth isolation valve 5, the second filter unit 2032 and the return air unit 2033 in the air supply circuit 1031 are closed, the third isolation valve 3 of the other ventilation duct 103 is opened and the sixth isolation valve 5 in the air supply circuit 1031 is closed, and the first filter unit 2031, the second filter unit 2032 and the return air unit 2033 are opened, so that air is input to the habitable area through the electric heater 4, the first filter unit 2031 and the second filter unit 2032 of the other ventilation duct 103.

[0083] In some embodiments, reference Figure 2 The control platform switches the ventilation system to normal air input mode through the following control methods: normal exhaust duct 101 is opened, and the third isolation valve 3, the first filter unit 2031, the sixth isolation valve 5, the second filter unit 2032 and the return air unit 2033 in the supply air circuit 1031 of one ventilation duct 103 are closed, the third isolation valve 3 of the other ventilation duct 103 is opened, the first filter unit 2031 and the return air unit 2033 in the supply air circuit 1031 are closed, and the sixth isolation valve 5 and the second filter unit 2032 are opened, so that air is input to the habitable area through the electric heater 4, the sixth isolation valve 5 and the second filter unit 2032 of the other ventilation duct 103, and exhaust is output through the normal exhaust duct 101.

[0084] In some embodiments, reference Figure 2 The control platform switches the ventilation system to internal circulation mode through the following control methods: the normal exhaust duct 101 is closed, and the third isolation valve 3, the first filter unit 2031, the sixth isolation valve 5, the second filter unit 2032, and the return air unit 2033 in one ventilation duct 103 are closed. The third isolation valve 3, the sixth isolation valve 5 in the supply air circuit 1031, the return air unit 2033, the first filter unit 2031, and the second filter unit 2032 in the other ventilation duct 103 are closed, and the return air unit 2033, the first filter unit 2031, and the second filter unit 2032 are opened, so that the air in the habitable area of ​​the main control room is processed by the return air unit, electric heater 4, first filter unit 2031, and second filter unit 2032 of the other ventilation duct 103 and then returned to the habitable area of ​​the main control room to achieve internal air circulation. The control platform is electrically connected to the indoor air supply pipeline flow regulating valve. It controls the air flow of the flow regulating valve according to the indoor air pressure of the habitable area to supply air to the habitable area so that the air pressure in the habitable area is kept higher than the outdoor atmospheric pressure.

[0085] In some embodiments, such as Figure 2As shown, the first filtration unit 2031 includes a seventh isolation valve 10, a high-efficiency filter group 11, a pressurizing fan 12, and an eighth isolation valve 13.

[0086] The first end of the seventh isolation valve 10 corresponds to the air inlet of the first filter unit 2031 and is connected to the second end of the electric heater 4. The second end of the seventh isolation valve 10 is connected to the first end of the eighth isolation valve 13 via the high-efficiency filter group 11 and the pressurized fan 12. The first end of the eighth isolation valve 13 corresponds to the air outlet of the first filter unit 2031 and is connected to the air inlet of the second filter unit 2032. The control platform is electrically connected to the seventh isolation valve 10, the pressurized fan 12, and the eighth isolation valve 13. When the first filter unit 2031 needs to be opened, the control platform controls the seventh isolation valve 10, the pressurized fan 12, and the eighth isolation valve 13 to open. When the first filter unit 2031 needs to be closed, the control platform controls the seventh isolation valve 10, the pressurized fan 12, and the eighth isolation valve 13 to close. The control platform also controls the air intake of the pressurized fan 12 to ensure that the air pressure in the habitable area is greater than the atmospheric pressure.

[0087] In internal circulation mode or emergency air input mode, the function of the pressurizing fan 12 is to pressurize the air supply so that the habitable area can maintain a positive pressure relative to the atmospheric environment.

[0088] In some embodiments, such as Figure 2 As shown, the high-efficiency filter assembly 11 includes a first pre-filter (FIP) for capturing large-diameter particles in the emergency air supply, a first aerosol high-efficiency filter (FIA) for filtering radioactive aerosol particles in the emergency air supply, an iodine filter (FII) for adsorbing and retaining radioactive iodine in the emergency air supply, and a second aerosol high-efficiency filter (FIA) for removing small-diameter aerosol particles in the emergency air supply and tiny carbon particles detached from the activated carbon iodine adsorber.

[0089] The second end of the seventh isolation valve 10 is connected to the pressurized blower 12 via the first pre-filter, the first aerosol HEPA filter, the iodine filter, and the second aerosol HEPA filter. The treatment by the HEPA filter assembly 11 ensures that the radioactive contamination level of the emergency air supply is maintained within a controllable range.

[0090] In some embodiments, under emergency air input mode, the pressure difference between the habitable area and the ambient air pressure is maintained within a first set pressure range. This ensures that the indoor and outdoor pressure difference in the habitable area is within a suitable range, preventing radioactive contaminated air from leaking into the habitable area and also preventing excessive air loss from the habitable area. Optionally, the first set pressure range is 30 Pa to 80 Pa, preferably 50 Pa.

[0091] In some embodiments, such as Figure 2As shown, the second filtration unit 2032 includes an air filter 6, a cooling coil 7 for cooling the supply air, a humidifier 8 for increasing the humidity of the supply air, and a blower 9 for providing power to the second filtration unit 2032.

[0092] The first end of the air filter device 6 corresponds to the air inlet of the second filter unit 2032 and is connected to the second end of the sixth isolation valve 5. The second end of the air filter device 6 is connected to the first end of the air supply fan 9 via the cooling coil 7 and the humidifier 8. The second end of the air supply fan 9 corresponds to the air outlet of the second filter unit 2032 and is connected to the habitable area. The control platform is electrically connected to the air supply fan 9. When the second filter unit 2032 needs to be turned on, the control platform controls the air supply fan 9 to turn on, providing air supply power so that air is input into the habitable area. When the second filter unit 2032 needs to be turned off, the control platform controls the air supply fan 9 to turn off. In the normal air input mode, the control platform also controls the air inlet volume of the air supply fan 9 to be greater than the exhaust volume of the exhaust fan 52, so that the air pressure in the habitable area is greater than the atmospheric pressure.

[0093] In this embodiment, the air filter 6 reduces large dust particles in the air, while the cooling coil 7 and humidifier 8 regulate the temperature and humidity of the air within a suitable range, providing a comfortable environment and clean air for the staff in the habitable area.

[0094] In some embodiments, under normal air input mode, the pressure difference between the habitable area and the ambient air pressure is maintained within a second set pressure range. This ensures that the indoor and outdoor pressure difference in the habitable area is maintained within a suitable range, thus maintaining a positive pressure environment in the main control room relative to the outdoor atmosphere. Optionally, the second set pressure range is 80 Pa to 150 Pa, preferably 100 Pa.

[0095] In some embodiments, such as Figure 2 As shown, the return air unit 2033 includes a ninth isolation valve 14. The two ends of the ninth isolation valve 14 are respectively connected to the first end of the electric heater 4 and the return air inlet of the habitable area. The control platform is electrically connected to the ninth isolation valve 14. When the return air unit 2033 needs to be opened, the control platform controls the ninth isolation valve 14 to open, allowing air in the habitable area to flow back to the first end of the electric heater 4 through the ninth isolation valve 14, thus establishing an air filtration circulation loop. When the return air unit 2033 needs to be closed, the control platform controls the ninth isolation valve 14 to close.

[0096] In some embodiments, the first to ninth isolation valves can all be electric valves.

[0097] In some embodiments, each of the two fresh air inlets 1032 is provided with a ventilation chamber that serves as a transfer compartment for fresh air between the habitable area and the atmospheric environment, and is generally located next to the air outlet of the fresh air inlet 1032.

[0098] As is readily understood, in this invention, the “connections” between devices or components related to air delivery are all achieved through ventilation ducts.

[0099] The technical solution of this invention determines the level of air radioactivity pollution in the atmosphere of the nuclear power plant area based on air radioactivity pollution data parameters through a control platform. This allows for flexible coordination between two ventilation ducts, normal exhaust ducts, indoor air supply ducts, and the first isolation valve. Appropriate ventilation ducts are selected as air sources, and the ventilation system operates in a suitable air input mode. This ensures that the level of air radioactivity pollution in the habitable area remains within a controllable range even under various accident conditions at the nuclear power plant, and maintains a positive pressure relative to the outdoor atmosphere in the habitable area. This prevents high-radioactivity air from leaking into the habitable area and ensures the radiation safety of personnel located in the habitable area.

[0100] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0101] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A ventilation system for habitable areas in the main control room of a nuclear power plant, characterized in that, Includes a normal exhaust duct (101) connected to the habitable area, an indoor air supply duct (102) and two ventilation ducts (103), a first isolation valve (29), and a control platform electrically connected to the first isolation valve (29), the normal exhaust duct (101), the indoor air supply duct (102) and the two ventilation ducts (103); The control platform controls the two ventilation ducts (103) to work in coordination with the normal exhaust duct (101), indoor air supply duct (102), and first isolation valve (29) based on air radioactive pollution data parameters, so as to control the switching of air input mode and the switching of air source between the two ventilation ducts (103), and to make the air pressure in the habitable area greater than the atmospheric pressure; the air input mode includes normal air input mode, emergency air input mode, internal circulation mode and equipment failure replacement mode; The indoor air supply line (102) includes a compressed air tank (50) for storing clean air; in the internal circulation mode, the compressed air tank (50) supplies the clean air to the habitable area; Each ventilation duct (103) includes an air supply circuit (1031), a fresh air inlet (1032) for inputting normal fresh air or emergency fresh air, and a third isolation valve (3) connected between the outlet of the fresh air inlet (1032) and the inlet of the air supply circuit (1031) for controlling whether fresh air is input; the control platform is electrically connected to the third isolation valve (3) and the air supply circuit (1031) to control the third isolation valve (3) and the air supply circuit (1031) to work together, thereby realizing the switching of the normal air input mode, the emergency air input mode and the internal circulation mode; the two ends of the first isolation valve (29) are respectively connected to the inlets of the air supply circuits (1031) in the two ventilation ducts (103). In the equipment failure replacement mode, the control platform controls the first isolation valve (29) to open so that the fault-free ventilation duct (103) replaces the faulty ventilation duct (103) to perform the normal air input mode, the emergency air input mode or the internal circulation mode; The air supply circuit (1031) includes an electric heater (4), a first filter unit (2031), a sixth isolation valve (5), a second filter unit (2032), and a return air unit (2033). The first end of the electric heater (4) corresponds to the air inlet of the air supply circuit (1031), and the second end of the electric heater (4) is connected to the air inlet of the first filter unit (2031) and the first end of the sixth isolation valve (5). The air outlet of the first filter unit (2031) and the second end of the sixth isolation valve (5) are connected to the air inlet of the second filter unit (2032). The air outlet of the second filter unit (2032) corresponds to the air outlet of the air supply circuit (1031). The two ends of the return air unit (2033) are respectively connected to the first end of the electric heater (4) and the habitable area. The control platform is electrically connected to the first filter unit (2031), the sixth isolation valve (5), the second filter unit (2032) and the return air unit (2033) to control the first filter unit (2031), the sixth isolation valve (5), the second filter unit (2032) and the return air unit (2033) to work together, thereby realizing the switching of the air input mode. The first filter unit (2031) includes a seventh isolation valve (10) which serves as the air inlet of the first filter unit (2031).

2. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 1, characterized in that, The indoor air supply pipeline (102) also includes a flow regulating valve (51); The compressed air tank (50) is connected to one end of the flow regulating valve (51), and the other end of the flow regulating valve (51) is connected to the habitable area; The control platform is electrically connected to the flow regulating valve (51). In the internal circulation mode, the control platform controls the air flow of the flow regulating valve (51) according to the indoor air pressure of the habitable area to replenish the habitable area with air so that the air pressure of the habitable area is kept greater than the outdoor atmospheric pressure.

3. The ventilation system for the habitable area of ​​the main control room of a nuclear power plant according to claim 1 or 2, characterized in that, The normal exhaust duct (101) includes an exhaust fan (52), a second isolation valve (53), and an exhaust outlet; The first end of the exhaust fan (52) is connected to the habitable area, and the second end of the exhaust fan (52) is connected to the exhaust port via the second isolation valve (53), and the exhaust port is connected to the atmospheric environment; The control platform is electrically connected to the exhaust fan (52) and the second isolation valve (53). When the normal exhaust duct (101) needs to be closed, the control platform controls the exhaust fan (52) and the second isolation valve (53) to close. When the normal exhaust duct (101) needs to be opened, the control platform controls the exhaust fan (52) and the second isolation valve (53) to open, so that the air in the habitable area is discharged into the atmosphere.

4. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 3, characterized in that, Each of the ventilation ducts (103) further includes a first monitoring unit (1033) connected to the air inlet of the fresh air inlet (1032) for monitoring the concentration of radioactive gas, and a second monitoring unit (1034) connected to the air outlet of the air supply circuit (1031) for monitoring the concentration of aerosol radioactivity and the concentration of iodine radioactivity. The control platform is also electrically connected to the first monitoring unit (1033) and the second monitoring unit (1034) to obtain the radioactive gas concentration, aerosol radioactive concentration and iodine radioactive concentration, and then determine the air input mode to be switched based on the radioactive gas concentration, aerosol radioactive concentration and iodine radioactive concentration.

5. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 4, characterized in that, The control platform uses the average concentration of radioactive gas collected by the first monitoring unit (1033) of each of the two ventilation ducts (103) within a second set time period as the basis for switching the air source.

6. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 4, characterized in that, It also includes an audible and visual alarm and two gamma dose rate monitors (1) for monitoring air gamma dose rate, which are installed in the fresh air inlet (1032) included in one of the ventilation ducts (103). The control platform is electrically connected to the audible and visual alarm and two gamma dose rate monitors (1). When the gamma dose rate is greater than the alarm threshold, the control platform controls the audible and visual alarm to sound an alarm, and controls the first monitoring unit (1033) and the second monitoring unit (1034) to turn on and enter the emergency wind input mode.

7. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 6, characterized in that, The first monitoring unit (1033) includes a fourth isolation valve (30), a first dryer (31), an aerosol and iodine filter (32), a first gas sampling pump (33), and an inert gas monitor (34). The first end of the fourth isolation valve (30) is connected to the air inlet of the fresh air inlet (1032), and the second end of the fourth isolation valve (30) is connected to the inert gas monitor (34) via the first dryer (31), the aerosol and iodine filter (32) and the first gas sampling pump (33). The control platform is electrically connected to the fourth isolation valve (30) and the first gas sampling pump (33) to control the opening of the fourth isolation valve (30) and the first gas sampling pump (33), thereby enabling the inert gas monitor (34) to detect the inert gas radioactivity concentration at the air inlet of the fresh air inlet (1032).

8. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 6, characterized in that, The second monitoring unit (1034) includes a fifth isolation valve (40), a second dryer (41), a second gas sampling pump (42), an aerosol radioactivity concentration monitor (43), and an iodine radioactivity concentration monitor (44). The first end of the fifth isolation valve (40) is connected to the air outlet of the air supply circuit (1031), and the second end of the fifth isolation valve (40) is connected to the iodine radioactivity concentration monitor (44) via the second dryer (41), the second gas sampling pump (42) and the aerosol radioactivity concentration monitor (43). The control platform is electrically connected to the fifth isolation valve (40) and the second gas sampling pump (42) to control the opening of the fifth isolation valve (40) and the second gas sampling pump (42), thereby enabling the aerosol radioactivity concentration monitor (43) and the iodine radioactivity concentration monitor (44) to detect the aerosol radioactivity concentration and iodine radioactivity concentration at the air outlet of the air supply circuit (1031) respectively.

9. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 4, characterized in that, In the emergency air input mode, the control platform controls the following: the normal exhaust duct (101) to be closed, the third isolation valve (3) of one ventilation duct (103) and the first filter unit (2031), the sixth isolation valve (5), the second filter unit (2032) and the return air unit (2033) in the air supply circuit (1031) to be closed, the third isolation valve (3) of another ventilation duct (103) to be opened, and the sixth isolation valve (5) in the air supply circuit (1031) to be closed, and the first filter unit (2031), the second filter unit (2032) and the return air unit (2033) to be opened, so that air is input to the habitable area through the electric heater (4), the first filter unit (2031) and the second filter unit (2032) of the other ventilation duct (103); In the normal air input mode, the control platform controls the normal exhaust duct (101) to open, and the third isolation valve (3) of one ventilation duct (103) and the first filter unit (2031), the sixth isolation valve (5), the second filter unit (2032) and the return air unit (2033) in the air supply circuit (1031) to close. The third isolation valve (3) of the other ventilation duct (103) is opened, and the first filter unit (2031) and the return air unit (2033) in the air supply circuit (1031) are closed, while the sixth isolation valve (5) and the second filter unit (2032) are opened, so that air is input to the habitable area through the electric heater (4), the sixth isolation valve (5) and the second filter unit (2032) of the other ventilation duct (103), and exhaust is output through the normal exhaust duct (101). In the internal circulation mode, the control platform controls the following: the normal exhaust duct (101) to be closed, the third isolation valve (3) of one ventilation duct (103) and the first filter unit (2031), the sixth isolation valve (5), the second filter unit (2032) and the return air unit (2033) in the air supply circuit (1031) to be closed, the third isolation valve (3) of another ventilation duct (103) to be closed and the sixth isolation valve (5) in the air supply circuit (1031) to be closed, and the return air unit (2033), the first filter unit (2031) and the second filter unit (2032) to be opened, so that the air is circulated internally through the electric heater (4), the first filter unit (2031), the second filter unit (2032), the habitable area of ​​the main control room and the return air unit (2033) of the other ventilation duct (103).

10. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 4, characterized in that, The first filtration unit (2031) also includes a high-efficiency filter group (11), a pressurizing fan (12), and an eighth isolation valve (13). The first end of the seventh isolation valve (10) corresponds to the air inlet of the first filter unit (2031), and the second end of the seventh isolation valve (10) is connected to the first end of the eighth isolation valve (13) via the high-efficiency filter group (11) and the pressurized fan (12). The first end of the eighth isolation valve (13) corresponds to the air outlet of the first filter unit (2031). The control platform is electrically connected to the seventh isolation valve (10), the pressurizing fan (12), and the eighth isolation valve (13). When the first filter unit (2031) needs to be opened, the control platform controls the seventh isolation valve (10), the pressurizing fan (12), and the eighth isolation valve (13) to open; when the first filter unit (2031) needs to be closed, the control platform controls the seventh isolation valve (10), the pressurizing fan (12), and the eighth isolation valve (13) to close. In the emergency air input mode and the internal circulation mode, the control platform also controls the air intake of the pressurizing fan (12) to make the air pressure in the habitable area greater than the atmospheric pressure.

11. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 10, characterized in that, The high-efficiency filter group (11) includes a first pre-filter, a first aerosol high-efficiency filter, an iodine filter, and a second aerosol high-efficiency filter; The second end of the seventh isolation valve (10) is connected to the pressurizing blower (12) via the first pre-filter, the first aerosol high-efficiency filter, the iodine filter, and the second aerosol high-efficiency filter.

12. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 10, characterized in that, In the emergency air input mode, the pressure difference between the habitable area and the ambient air pressure is maintained within a first set pressure range.

13. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 12, characterized in that, The first set air pressure range is 30Pa~80Pa.

14. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 4, characterized in that, The second filtration unit (2032) includes an air filter (6), a cooling coil (7), a humidifier (8), and a blower (9); The first end of the air filter device (6) corresponds to the air inlet of the second filter unit (2032), and the second end of the air filter device (6) is connected to the first end of the air supply fan (9) via the cooling coil (7) and the humidifier (8). The second end of the air supply fan (9) corresponds to the air outlet of the second filter unit (2032). The control platform is electrically connected to the air supply fan (9). When the second filter unit (2032) needs to be turned on, the control platform controls the air supply fan (9) to turn on; when the second filter unit (2032) needs to be turned off, the control platform controls the air supply fan (9) to turn off. In the normal air input mode, the control platform also controls the air intake of the air supply fan (9) to be greater than the exhaust air intake of the exhaust fan (52), so that the air pressure in the habitable area is greater than the atmospheric air pressure.

15. The ventilation system for habitable areas of the main control room of a nuclear power plant according to claim 14, characterized in that, In the normal wind input mode, the pressure difference between the habitable area and the ambient air pressure is maintained within the second set pressure range.

16. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 15, characterized in that, The second set air pressure range is 80Pa~150Pa.

17. The ventilation system for habitable areas in the main control room of a nuclear power plant according to claim 4, characterized in that, The return air unit (2033) includes a ninth isolation valve (14); The two ends of the ninth isolation valve (14) are respectively connected to the first end of the electric heater (4) and the habitable area; The control platform is electrically connected to the ninth isolation valve (14). When the return air unit (2033) needs to be opened, the control platform controls the ninth isolation valve (14) to open; when the return air unit (2033) needs to be closed, the control platform controls the ninth isolation valve (14) to close.

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