Nuclear power equipment gas emission device, system and method

Abstract

The invention discloses a nuclear power equipment gas discharge device, system and method.The device comprises a reactor top exhaust system connected with a pressure vessel, the reactor top exhaust system comprises a normal exhaust pipeline and a reactor top accident exhaust system, the reactor top accident exhaust system comprises an accident exhaust pipeline capable of being opened and closed, and in the normal operation state of a nuclear power station, the accident exhaust pipeline can be opened and closed. The accident exhaust pipeline is in a closed state, and when the nuclear power station is in an accident operation state, the accident exhaust pipeline is in an open state. According to the invention, emission of non-condensable gas is realized through the reactor top accident exhaust system and two redundant independent digital control systems, effectiveness and independence of the exhaust function under the accident working condition are realized from the aspects of process pipeline / equipment configuration and control scheme, and the problem that the non-condensable gas cannot be exhausted in time under the accident working condition is avoided; and meanwhile, the problem that holes are formed in the top of the pressure container again is avoided, and the influence on the original design is minimized.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power technology, and in particular to a gas exhaust device, system and method for nuclear power equipment. Background Art

[0002] In the existing nuclear power units of the CPR (China Improved Pressurized Water Reactor) project, only one normal discharge pipeline is configured on the top of the pressure vessel. This pipeline only has the normal exhaust function before and after the unit is shut down for maintenance and refueling, and does not have the exhaust function under accident conditions.

[0003] In an accident beyond the design basis, coolant irradiation, precipitation of dissolved hydrogen in the coolant system, metal corrosion, and possible zirconium-water reaction will all produce non-condensable gases. During the long-term stage of the accident, a large amount of non-condensable gases may accumulate on the upper head of the pressure vessel and may enter the coolant loop. The presence of a large amount of non-condensable gases in the pressure vessel brings about two adverse effects: (1) There are two free interfaces in the coolant system, which affects the depressurization of the primary loop system and the reflooding of the core, which is not conducive to the cooling of the core; (2) Non-condensable gases may enter the coolant loop and accumulate on the top of the U-tube of the steam generator, blocking the natural circulation of the coolant and seriously affecting the heat extraction of the core.

[0004] Therefore, it is necessary to improve the existing nuclear power plant pressure vessel top exhaust scheme. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a nuclear power equipment gas exhaust device, system and method, aiming to solve the problem that the exhaust function cannot be used normally under accident conditions.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect, the present invention provides a gas emission device for nuclear power equipment, including a normal stack top exhaust system connected to a pressure vessel, the normal stack top exhaust system including a normal exhaust pipeline, and also including a stack top accident exhaust system, the stack top accident exhaust system including an accident exhaust pipeline that can be opened and closed, the accident exhaust pipeline being connected to the normal exhaust pipeline; when the nuclear power plant is in a normal operating state, the accident exhaust pipeline is in a closed state, and when the nuclear power plant is in an accident operating state, the accident exhaust pipeline is in an open state.

[0008] Furthermore, the emergency exhaust pipeline is provided with at least one or two parallel valve groups.

[0009] Furthermore, each column of the valve groups includes at least two isolation valves connected in series.

[0010] Furthermore, the isolation valve is a solenoid valve.

[0011] Furthermore, a temperature sensor is provided at a downstream position of each column of the valve groups.

[0012] Furthermore, when multiple columns of the valve groups are provided, each column of the valve groups is powered by a different power source.

[0013] Furthermore, the downstream end of the accident exhaust pipeline is connected to a pressure relief box.

[0014] In a second aspect, a control system based on the above-mentioned nuclear power equipment gas emission device includes a main control panel and one or more control cabinets, the valve group is connected to the control cabinet, and the control cabinet is connected to the main control panel.

[0015] Furthermore, when there are multiple columns of the valve groups, each column of the valve groups is configured with a control cabinet, each column of the valve groups is connected to the corresponding control cabinet, each control cabinet is configured with an independent power supply, and multiple control cabinets are connected to the same main control panel.

[0016] Furthermore, the information displayed on the main control screen includes: valve group opening and closing buttons, valve position detection information and valve group downstream temperature monitoring information.

[0017] In a third aspect, the present invention further provides an exhaust method for a nuclear power equipment gas exhaust device, comprising:

[0018] When the nuclear power plant is in normal operation, normal exhaust is carried out through the normal exhaust pipeline, and the accident exhaust pipeline is kept in a closed state;

[0019] When the nuclear power plant is in an accident operation state, the accident exhaust pipeline is kept in an open state, and the non-condensable gas at the top of the pressure vessel is transported by the accident exhaust pipeline.

[0020] Furthermore, when multiple valve groups are provided, when the nuclear power plant is in an accident operation state, the accident exhaust pipeline is opened, and the non-condensable gas at the top of the pressure vessel is transported by the accident exhaust pipeline, including:

[0021] At least one valve group among the multiple valve groups is kept in an open state.

[0022] Furthermore, it also includes:

[0023] Obtain temperature data collected by the temperature sensor;

[0024] If the collected temperature value exceeds the set alarm temperature value, an alarm reminder will be triggered.

[0025] Compared with the prior art, the present invention has the following beneficial effects: the gas discharge device of nuclear power equipment includes a normal exhaust system on the top of the pile connected to the pressure vessel, the normal exhaust system on the top of the pile includes a normal exhaust pipeline, and also includes an accident exhaust system on the top of the pile, the accident exhaust system on the top of the pile includes an accident exhaust pipeline that can be opened and closed, and the accident exhaust pipeline is connected to the normal exhaust pipeline; when the nuclear power plant is in normal operation, the accident exhaust pipeline is in a closed state, and when the nuclear power plant is in an accident operation state, the accident exhaust pipeline is in an open state. The present invention discharges non-condensable gas through the accident exhaust system on the top of the pile, avoiding the problem that non-condensable gas cannot be discharged in time under accident conditions. At the same time, the accident exhaust pipeline is directly connected to the original normal exhaust pipeline, avoiding the problem of re-opening a hole on the top of the pressure vessel, ensuring the minimization of the impact on the original design.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the structure of a gas exhaust device for nuclear power equipment provided by a specific embodiment of the present invention;

[0029] Figure 2 This is a system architecture diagram of a control system based on a gas emission device of a nuclear power plant;

[0030] Figure 3 A flow chart of an exhaust method for a gas exhaust device of a nuclear power plant provided in a specific embodiment of the present invention.

[0031] Reference numerals

[0032] 1. Accident exhaust pipeline; 2. Valve group; 3. Normal exhaust pipeline; 4. Water level measurement pipeline; 5. Water level measuring instrument; 6. Pressure relief box; 7. Temperature sensor; 8. Pressure vessel. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of 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.

[0034] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] like Figure 1 As shown, an embodiment of the present invention provides a gas emission device for nuclear power equipment, including a normal stack top exhaust system connected to a pressure vessel 8, the normal stack top exhaust system including a normal exhaust pipeline 3, and also including a stack top accident exhaust system, the stack top accident exhaust system including an openable and closable accident exhaust pipeline 1, the accident exhaust pipeline 1 being connected to the normal exhaust pipeline 3; when the nuclear power plant is in a normal operating state, the accident exhaust pipeline 1 is in a closed state, and when the nuclear power plant is in an accident operating state, the accident exhaust pipeline 1 is in an open state.

[0040] The non-condensable gas is discharged through the stack top accident exhaust system, which avoids the problem of non-condensable gas not being able to be discharged in time under accident conditions. At the same time, the accident exhaust pipeline 1 is directly connected to the original normal exhaust pipeline 3, which avoids the problem of re-opening a hole on the top of the pressure vessel 8, ensuring that the impact on the original design is minimized.

[0041] In actual application, the top cover of the pressure vessel 8 is located in the center of the reactor water pool. Considering that the top cover of the pressure vessel 8 must be removed during refueling, the equipment and cables of the top exhaust subsystem cannot be arranged as a whole on the top cover of the reactor pressure vessel 8. It is difficult to set up a supporting structure around the reactor water pool. If it is arranged around the reactor water pool, it will affect the filling and drainage of the reactor water pool. Obviously, the support design of the top accident exhaust system will be a difficult point. Regardless of whether the support is fixed on the wall of the refueling water pool or on the top cover, it will bring inconvenience to operation and maintenance.

[0042] According to the existing CPR project pressure vessel 8 top pipeline technical scheme, a normal exhaust pipeline 3 is set at the top of the reactor pressure vessel 8, namely Figure 1 The pipeline where the 640VP valve is located is connected in parallel to the normal exhaust pipeline 3 with a water level measuring pipeline 4 of the pressure vessel 8, that is, the pipeline where the 893VP valve is located in the figure, and a water level measuring instrument 5 is provided on the water level measuring pipeline 4. The normal exhaust pipeline 3 is connected to the water level measuring pipeline 4, and the support method of the normal exhaust pipeline 3 can be fixed on the wall or the ground of the room where the pressure vessel 8 is located, so that the non-condensable gas can be discharged smoothly in the event of an accident, and the inconvenience caused by reopening the top of the pressure vessel 8 and the operation and maintenance can be avoided.

[0043] In one embodiment, the emergency exhaust pipeline 1 is provided with at least one or two parallel valve groups 2 .

[0044] like Figure 1 As shown, the accident exhaust pipeline 1 connected from the water level measurement pipeline 4 is divided into two, that is, two parallel lines, each line is provided with a valve group 2, and the downstream ends of the pipelines of the two valve groups 2 are reconnected and connected to the pressure relief box 6. The exhaust operation of non-condensable gases such as hydrogen under accident conditions can be controlled by the operator in the main control room. When one or both of the two groups are opened, the non-condensable gas is discharged to the pressure relief box 6, and the pressure relief box 6 is discharged to the containment after the bursting disk is broken.

[0045] It should be noted that the design of two parallel valve groups 2 has the advantage that if one of the valve groups 2 has a problem, the other valve group 2 can be used to exhaust, thereby improving the reliability of exhaust under accident conditions. It can be understood that when an accident condition occurs, both valve groups 2 can be opened at the same time to improve the efficiency of exhaust.

[0046] In one embodiment, each valve group 2 includes at least two isolation valves connected in series.

[0047] like Figure 1 As shown, each valve group 2 is provided with two isolation valves connected in series. The two isolation valves must be opened at the same time to realize the discharge function of the pipeline where the valve group 2 is located. Such a design can avoid the accidental discharge caused by the accidental opening of a single isolation valve, so as to improve the reliability of use.

[0048] The isolation valve can be a solenoid valve, an electric valve or a pneumatic valve. Preferably, the isolation valve is a solenoid valve. The advantage is that the solenoid valve has a compact structure, a small size and a light weight compared to electric valves and pneumatic valves, and the solenoid valve has a fast action speed and can quickly open and exhaust.

[0049] In one embodiment, a temperature sensor 7 is provided at the downstream position of each valve group 2, where the downstream position refers to the downstream position along the exhaust direction of the non-condensable gas.

[0050] like Figure 1 As shown, a temperature sensor 7 is arranged at the downstream position of the pipeline where the two rows of valve groups 2 are located. Its function is to detect whether there is leakage in the pipeline when the unit is operating normally, and it is also used to provide relevant temperature information to the operator after the valve group 2 is opened. This temperature information is displayed in real time in the main control room.

[0051] In order to reduce the number of pipeline openings, a surface contact thermometer is selected as the temperature sensor 7. In actual applications, the normal exhaust pipeline 3 is not provided with an insulation layer, the unit operates normally, the four isolation valves are in a closed state, and the temperature between adjacent isolation valves of each valve group 2 and the pipeline downstream of the isolation valve is the ambient temperature of the room. When the isolation valve leaks or is opened by mistake, the temperature will change significantly.

[0052] In one embodiment, when multiple columns of valve groups 2 are provided, each column of valve groups 2 is powered by a different power supply. Specifically, two independent safety-grade 48VDC direct current power supplies can be used to provide power under normal working conditions, and a dedicated UPS for severe accidents can be used to provide power under severe accidents. This design can avoid the influence between different columns of valve groups 2, and when in use, only the column of valve groups 2 that needs to work needs to be powered.

[0053] The embodiment of the present invention also provides a control system based on the above-mentioned nuclear power equipment gas emission device, including a main control panel and one or more control cabinets, the valve group is connected to the control cabinet, and the control cabinet is connected to the main control panel.

[0054] In actual application, the control system is completely independent of the original system, has no signal interaction, and has high seismic resistance requirements and emergency power supply needs. The main control screen is arranged in the computer room next to the main control room, and the control cabinet is arranged in the electrical plant. The information displayed on the main control screen includes: valve group opening and closing buttons, valve position detection information, and valve group downstream temperature monitoring information. Among them, the valve group opening and closing buttons are used to manually control the opening and closing of each isolation valve in the valve group. The signal between the touch screen and the control cabinet is transmitted through a wired or wireless network.

[0055] In one embodiment, when there are multiple columns of valve groups, each column of valve groups is configured with a control cabinet, each column of valve groups is connected to the corresponding control cabinet, each control cabinet is configured with an independent power supply, and multiple control cabinets are connected to the same main control panel.

[0056] like Figure 2 As shown, Figure 2There are two control cabinets arranged in the middle, namely, the control cabinet of column A and the control cabinet of column B. The two control cabinets correspond to the two valve groups respectively. The control cabinets of column A and column B are connected to the same main control panel signal. The control cabinet of column A is electrically connected to the valve group composed of two isolation valves RCP671VP and RCP673VP. The control instructions of column A based on the main control panel are used to control the opening and closing of the valve group composed of the two isolation valves RCP671VP and RCP673VP. The control cabinet of column B is electrically connected to the valve group composed of two isolation valves RCP672VP and RCP674VP. The control instructions of column B based on the main control panel are used to control the opening and closing of the valve group composed of the two isolation valves RCP672VP and RCP674VP. In addition, the control cabinet of column A and the control cabinet of column B are powered by two independent mobile power supplies PFM respectively, that is, the power supply of the control cabinet of column A and the power supply of the control cabinet of column B do not affect each other.

[0057] The embodiment of the present invention further provides an exhaust method for a gas exhaust device of a nuclear power plant, and the method is implemented based on the control system of the gas exhaust device of the nuclear power plant.

[0058] like Figure 3 As shown, the exhaust method of the gas exhaust device of nuclear power equipment includes the following steps: S10-S20.

[0059] S10. When the nuclear power plant is in normal operation, normal exhaust is performed through the normal exhaust pipeline 3, and the accident exhaust pipeline 1 is in a closed state.

[0060] During the daily stable operation stage of the nuclear power plant, the system is in normal operation. At this time, the entire exhaust work is mainly undertaken by the normal exhaust pipeline 3 in the normal exhaust system on the top of the pile. At the same time, the control of normal exhaust can be controlled based on the original system. The design of the normal exhaust pipeline 3 is based on the gas flow, pressure and other parameters generated during the normal operation of the nuclear power plant. In order to ensure the safety and stability of the system, the accident exhaust pipeline 1 is in a closed state at this stage, which can effectively prevent the gas from accidentally entering the accident exhaust pipeline 1 during normal operation, and ensure that the entire normal exhaust system operates according to the established normal process.

[0061] S20. When the nuclear power plant is in an accident operation state, the accident exhaust pipeline 1 is opened, and the non-condensable gas at the top of the pressure vessel 8 is transported by the accident exhaust pipeline 1.

[0062] When a nuclear power plant enters an accident operation state due to various reasons (such as equipment failure, external force majeure, etc.), the entire exhaust strategy needs to be adjusted immediately. At this time, the first task is to open the accident exhaust pipeline 1. The main control panel sends an opening command to the control cabinet, and then the control cabinet controls the corresponding valve group to open. When the isolation valve receives the opening signal, the isolation valve opens in sequence or synchronously in a predetermined order.

[0063] When multiple valve groups 2 are provided, in order to ensure the reliability of exhaust in an accident state, at least one valve group 2 in the multiple valve groups 2 can be in an open state. Figure 2 As shown, when an accident is detected, the valve group 2 corresponding to the control cabinet in column A can be opened first according to the preset logic. If a fault occurs during the opening of the valve group 2 (such as a certain isolation valve cannot be opened normally), the opening procedure of the valve group 2 corresponding to the control cabinet in column B will be immediately started. Once the accident exhaust pipeline 1 is opened, its main function is to transport the non-condensable gas at the top of the pressure vessel 8. The accident exhaust pipeline 1 transports these non-condensable gases to the pressure relief box 6, which can collect and process these gases.

[0064] In one embodiment, the exhaust method of the gas exhaust device of nuclear power equipment further includes the following steps: S30-S40.

[0065] S30, acquiring temperature data collected by the temperature sensor 7.

[0066] During the operation of the gas emission device of the nuclear power equipment, the temperature can be obtained through the main control screen as a key monitoring parameter. A temperature sensor 7 is provided at the downstream position of each valve group 2, and its function is to monitor the temperature of the gas after passing through the valve group 2 in real time.

[0067] During actual operation, the temperature sensor 7 will continuously collect temperature data at a set frequency. The collected data will be transmitted to the main control screen through the transmission line in the form of electrical signals.

[0068] S40: If the collected temperature value exceeds the set alarm temperature value, an alarm reminder is triggered.

[0069] An alarm temperature value is pre-set in the control system. This value is determined based on the safe operation standards of the nuclear power plant and the design parameters of the exhaust system, and is generally set to 70°C.

[0070] When the control system receives the temperature data from the temperature sensor 7, it will compare the real-time collected temperature value with the set alarm temperature value. For example, at a certain moment, the temperature value collected by the temperature sensor 7 is 85°C. After receiving the data, the control system immediately makes a comparison and judgment and finds that 85°C is greater than the set alarm temperature value of 70°C. Once it is determined that the collected temperature value exceeds the set alarm temperature value, the control system will immediately trigger the alarm reminder mechanism. The alarm reminder can be implemented in a variety of ways. For example, there will be a special sound and light alarm device in the control room of a nuclear power plant. When the temperature exceeds the standard, the light alarm will flash a strong red light, and the sound alarm will emit a sharp alarm sound to attract the attention of the operator. In addition, on the operation interface of the control system, a striking alarm prompt window will pop up, displaying specific alarm information, such as "temperature exceeds the standard, current temperature 85°C", and accompanied by relevant operation suggestions, such as checking whether the exhaust system is blocked. When the alarm is triggered, the operator confirms the leak.

[0071] The setting of alarm reminders allows operators to take quick measures to avoid more serious equipment damage or safety accidents caused by overtemperature, ensuring the stable operation of the nuclear power plant exhaust system and the safety of the entire nuclear power plant. At the same time, this design also helps to discover potential problems in advance, conduct preventive maintenance, reduce equipment downtime, and improve the operating efficiency of the nuclear power plant.

[0072] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A gas exhaust device for a nuclear power plant, comprising a normal exhaust system on the top of a pile connected to a pressure vessel, wherein the normal exhaust system on the top of the pile comprises a normal exhaust pipeline, characterized in that: It also includes a stack top accident exhaust system, the stack top accident exhaust system includes an openable and closable accident exhaust pipeline, the accident exhaust pipeline is connected to the normal exhaust pipeline; When the nuclear power plant is in normal operation, the accident exhaust pipeline is in a closed state; when the nuclear power plant is in accident operation, the accident exhaust pipeline is in an open state.

2. The nuclear power equipment gas exhaust device according to claim 1, characterized in that: The emergency exhaust pipeline is provided with at least one or two parallel valve groups.

3. The nuclear power equipment gas exhaust device according to claim 2, characterized in that: Each column of the valve group includes at least two isolation valves connected in series.

4. The nuclear power equipment gas exhaust device according to claim 3, characterized in that: The isolation valve is a solenoid valve.

5. The nuclear power equipment gas exhaust device according to claim 2, characterized in that: A temperature sensor is provided at the downstream position of each column of the valve groups.

6. The nuclear power equipment gas exhaust device according to any one of claims 1 to 5, characterized in that: When multiple columns of the valve groups are provided, each column of the valve groups is powered by a different power source.

7. The nuclear power equipment gas exhaust device according to claim 1, characterized in that: The downstream end of the emergency exhaust pipeline is connected to the pressure relief box.

8. A control system for a nuclear power plant gas emission device according to any one of claims 2 to 7, characterized in that: It includes a main control panel and one or more control cabinets, the valve group is connected to the control cabinet, and the control cabinet is connected to the main control panel.

9. The control system based on the gas emission device of nuclear power equipment according to claim 8, characterized in that: When there are multiple columns of the valve groups, each column of the valve groups is configured with a control cabinet, each column of the valve groups is connected to the corresponding control cabinet, each control cabinet is configured with an independent power supply, and multiple control cabinets are connected to the same main control panel.

10. The control system based on the gas emission device of nuclear power equipment according to claim 8, characterized in that: The information displayed on the main control screen includes: valve group opening and closing buttons, valve position detection information and valve group downstream temperature monitoring information.

11. An exhaust method for a gas exhaust device of a nuclear power plant, characterized in that: include: When the nuclear power plant is in normal operation, normal exhaust is carried out through the normal exhaust pipeline, and the accident exhaust pipeline is kept in a closed state; When the nuclear power plant is in an accident operation state, the accident exhaust pipeline is kept in an open state, and the non-condensable gas at the top of the pressure vessel is transported by the accident exhaust pipeline.

12. The exhaust method of a nuclear power plant gas exhaust device according to claim 11, characterized in that: When multiple valve groups are provided, when the nuclear power plant is in an accident operation state, the accident exhaust pipeline is opened, and the non-condensable gas at the top of the pressure vessel is transported by the accident exhaust pipeline, including: At least one valve group among the multiple valve groups is kept in an open state.

13. The exhaust method of a nuclear power plant gas exhaust device according to claim 11, characterized in that: Also includes: Obtain temperature data collected by the temperature sensor; If the collected temperature value exceeds the set alarm temperature value, an alarm reminder will be triggered.

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