A simulation test system for the containment seal of a nuclear power plant

Abstract

The present invention provides a simulation test system for the tightness of a nuclear power plant containment, comprising: a containment simulator, a charging and discharging system, a pressure relief system, a data acquisition system, an analysis system, a temperature control system, a humidity control system, a pressure control system, and a leakage introduction system. The containment simulator, the gas charging system, the gas exhaust system, the data acquisition system, and the data analysis system constitute the basic configuration part of the tightness test, realizing the pressure increase, pressure decrease inside the shell, and data acquisition and data analysis on the pressure platform, and meeting the basic requirements of the tightness test of the nuclear power plant containment. The temperature control system, the humidity control system, the pressure control system, and the leakage introduction system constitute the configuration part of the scientific research environment, realizing the change control of factors such as temperature, humidity, pressure, and leakage inside the shell.

Description

Technical Field

[0001] The present invention relates to the scientific research field of nuclear engineering technology, and particularly relates to a simulation test system for the tightness of a containment vessel in a nuclear power plant. Background Art

[0002] The containment vessel is the last physical barrier for nuclear power safety, and the tightness of the containment vessel is an important indicator for measuring the installation quality of the containment vessel.

[0003] However, in a nuclear power plant, it takes more than one week to perform a tightness test of the containment vessel once, which brings great economic losses to the nuclear power plant. Therefore, the nuclear power plant will not allow any scientific research that affects the construction period to be carried out on the actual containment vessel. In addition, the tightness test of the containment vessel is carried out along with the strength test, and the pressure will exceed the design pressure, which belongs to a destructive test. Therefore, the fewer tests are performed, the better. Except for the necessary regular tests, no redundant tests will be allowed.

[0004] On the other hand, due to the importance of the tightness test of the containment vessel in a nuclear power plant, the nuclear power plant has extremely high requirements for the smooth progress of the tightness test of the containment vessel, and also has extremely high expectations for the technical maturity of the test personnel and the test technology.

[0005] However, even though the operating unit of the nuclear power plant and the nuclear power design unit have some ideas about the tightness test of the containment vessel, due to the huge capital investment required, it is difficult to achieve the test effect through practice. This also makes it difficult to realize the expectations of the operating unit of the nuclear power plant, such as shortening the tightness test time of the containment vessel and quickly improving the test maturity, and also makes the tightness test technology of the containment vessel in domestic nuclear power plants outdated and stagnant for many years. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a simulation test system for the tightness of a containment vessel in a nuclear power plant, which is specifically used for carrying out scientific research, aiming at the above deficiencies in the prior art.

[0007] The technical solution adopted to solve the technical problem of the present invention is as follows:

[0008] The present invention provides a simulation test system for the tightness of a containment vessel in a nuclear power plant, including: a containment vessel simulation body, a charging and discharging system, a pressure relief system, a collection system, an analysis system, a temperature control system, a humidity control system, a pressure control system, and a leakage introduction system.

[0009] The charging and discharging system is connected to the containment vessel simulation body and is used to charge / discharge gas into / from the inside of the containment vessel simulation body so that the pressure inside the containment vessel simulation body reaches a preset test pressure.

[0010] The pressure relief system is connected between the containment vessel simulation body and the atmospheric environment and is used to relieve the pressure of the containment vessel simulation body so that it returns to atmospheric pressure.

[0011] The temperature control system is connected to the containment simulator and is used to simulate the heating of the gas in the containment simulator by the key heat sources in the containment, so as to maintain the temperature of the gas in the containment simulator at a preset test temperature, or to increase or decrease the temperature of the gas in the containment simulator at a set rate.

[0012] The humidity control system is connected to the containment simulator and is used to simulate the humidification of the gas in the containment simulator by the key water sources in the containment, so as to maintain the humidity of the gas in the containment simulator at a preset test humidity, or to humidify the gas in the containment simulator at a set rate.

[0013] The pressure control system is connected to the containment simulator and is used to fill / discharge gas into / from the containment simulator, so as to maintain the pressure inside the containment simulator at a preset test pressure.

[0014] The leakage introduction system is connected to the containment simulator and is used to introduce a set leakage amount of gas at different positions of the containment simulator.

[0015] The acquisition system is used to acquire the gas parameters of the containment simulator and each module. The analysis system is electrically connected to the acquisition system and is used to determine the leakage rate of the containment simulator according to the data acquired by the acquisition system after the pressure inside the containment simulator reaches or maintains a preset test pressure.

[0016] Optionally, the temperature control system includes a first group of electric heating elements arranged at the central position of the containment simulator, a second group of electric heating elements arranged at the position corresponding to the bottom head of the containment simulator, a third group of electric heating elements arranged at the position corresponding to the first layer compartment of the containment simulator, a fourth group of electric heating elements arranged at the position corresponding to the second layer compartment of the containment simulator, and a fifth group of electric heating elements arranged at the position corresponding to the upper space of the containment simulator. A plurality of electric heating elements in the first group are arranged at intervals along the height direction of the containment simulator, and a plurality of electric heating elements in each of the remaining groups are arranged at intervals along the circumferential direction of the containment simulator.

[0017] Optionally, the temperature control system further includes a plurality of temperature control units, and the plurality of temperature control units correspond to the plurality of groups of electric heating elements one by one.

[0018] Each temperature control unit includes a temperature sensor, a PID temperature controller, and a manual power regulator. The temperature sensor is disposed near the corresponding electric heating element, and is electrically connected to the corresponding PID temperature controller and manual power regulator respectively. The electric heating element is electrically connected to the corresponding PID temperature controller and manual power regulator respectively. The temperature sensor measures the temperature of the gas near the corresponding electric heating element and transmits it to the PID temperature controller and the manual power regulator. The PID temperature controller or the manual power regulator adjusts the power of the corresponding electric heating element according to the data transmitted by the temperature sensor.

[0019] Optionally, the humidity control system includes a humidification module. The humidification module includes a water storage tank, a main process pipeline, a booster pump, a humidification flow transmitter, a first group of spray nozzles, a second group of spray nozzles, and a third group of spray nozzles. The water storage tank is connected to an external water source. One end of the main process pipeline is connected to the water storage tank, and the other end extends upward to the position corresponding to the upper head of the containment simulator. The booster pump and the humidification flow transmitter are disposed on the main process pipeline. The first group of spray nozzles is disposed at the position corresponding to the bottom head of the containment simulator. The second group of spray nozzles is disposed at the position corresponding to the top of the second compartment of the containment simulator. The third group of spray nozzles is disposed at the position corresponding to the upper head of the containment simulator. The first group of spray nozzles, the second group of spray nozzles, and the third group of spray nozzles are all connected to the main process pipeline through branch pipes. Solenoid valves are provided on both the main process pipeline and the branch pipes.

[0020] The humidification flow transmitter is electrically connected to the acquisition system. A liquid level gauge is provided in the water storage tank, and the liquid level gauge is electrically connected to the acquisition system.

[0021] Optionally, the humidity control system further includes a dehumidification module. The dehumidification module includes a dryer, a circulation fan, and a circulation pipe. Both ends of the circulation pipe extend into the containment simulator. The dryer and the circulation fan are both disposed on the circulation pipe. The circulation fan is used to draw the gas in the containment simulator into the dryer for drying and then send it back into the containment simulator. An isolation valve is provided on the circulation pipe.

[0022] Optionally, the pressure control system includes an in-containment positive pressure control module and an in-containment negative pressure control module. The in-containment positive pressure control module is used to fill the containment simulator with gas so that the pressure inside the containment simulator maintains a preset test pressure. The in-containment negative pressure control module is used to evacuate the gas in the containment simulator so that the pressure inside the containment simulator maintains a preset test pressure.

[0023] Optionally, the in-containment positive pressure control module includes a positive pressure PID control unit, a charging pipeline, and an emergency air compressor, a positive pressure electric control valve, a positive pressure flow transmitter, a positive pressure pressure transmitter, a positive pressure temperature transmitter, and a positive pressure humidity transmitter located on the charging pipeline. The charging pipeline is connected to the containment simulator, and an isolation valve is also provided thereon.

[0024] The positive pressure flow transmitter, positive pressure pressure transmitter, positive pressure temperature transmitter, and positive pressure humidity transmitter are all electrically connected to the acquisition system.

[0025] The acquisition system, positive pressure PID control unit, and positive pressure electric control valve are electrically connected in sequence. The positive pressure PID control unit adjusts the opening degree of the positive pressure electric control valve according to the parameters of the gas in the charging pipeline and the gas parameters in the containment mock-up collected by the acquisition system, so as to maintain the pressure inside the containment mock-up at a preset test pressure.

[0026] Optionally, the negative pressure control module inside the shell includes a negative pressure PID control unit, an extraction pipeline, and an extraction fan, a negative pressure electric control valve, and a negative pressure flow transmitter located on the extraction pipeline. The extraction pipeline is connected to the containment mock-up, and an isolation valve is also provided thereon.

[0027] The negative pressure flow transmitter, acquisition system, negative pressure PID control unit, and negative pressure electric control valve are electrically connected in sequence. The negative pressure PID control unit adjusts the opening degree of the negative pressure electric control valve according to the parameters of the gas in the extraction pipeline and the gas parameters in the containment mock-up collected by the acquisition system, so as to maintain the pressure inside the containment mock-up at a preset test pressure.

[0028] Optionally, the pressure control system further includes a pressure guiding pipeline network, which is located inside the containment mock-up and is respectively connected to the charging pipeline and the extraction pipeline. It is used to divert the gas in the charging pipeline and flow it into different positions inside the containment mock-up, or to collect the gas inside the containment mock-up and then enter the extraction pipeline.

[0029] Optionally, the leakage introduction system includes a leakage introduction unit and multiple leakage measurement point units. The multiple leakage measurement point units are respectively arranged at different positions of the containment mock-up. The leakage measurement point unit includes an access pipe and a quick connector. One end of the access pipe extends into the containment mock-up, and the other end is connected to the quick connector. An isolation valve is provided on the access pipe.

[0030] The leakage introduction unit includes an introduction PID controller, an introduction pipeline, and an introduction electric control valve, an introduction flow transmitter, an introduction pressure transmitter, an introduction temperature transmitter, and an introduction humidity transmitter located on the introduction pipeline. One end of the introduction pipeline is used to be connected to the corresponding access pipe through a quick connector, and the other end is used to be connected to an extraction device or an inflation device.

[0031] The introduction flow transmitter, introduction pressure transmitter, introduction temperature transmitter, and introduction humidity transmitter are all electrically connected to the acquisition system.

[0032] The acquisition system, the introduced PID controller, and the introduced electric control valve are electrically connected in sequence. The introduced PID controller adjusts the opening degree of the positive pressure electric control valve according to the parameters of the gas in the introduced pipeline collected by the acquisition system, so that the leakage introduction system introduces a set leakage amount of gas into the containment simulator.

[0033] The containment tightness simulation test system constructed by the present invention not only includes the standard configuration required for simulating the containment tightness test of a nuclear power plant, and can realize all simulations of the containment tightness test process of a nuclear power plant; but also innovatively adds a temperature control, humidity control, pressure control, leakage position control, etc., which are specifically used for the scientific research environment simulation system, and can carry out scientific research on the containment tightness test of a nuclear power plant on an environmental platform with specified temperature, humidity, pressure and leakage position. Brief Description of the Drawings

[0034] Figure 1 It is the organizational block diagram of the containment tightness simulation test system provided in Embodiment 1 of the present invention;

[0035] Figure 2 It is the top view of the layout of the temperature control system;

[0036] Figure 3 It is the front view of the layout of the temperature control system;

[0037] Figure 4 It is the design schematic diagram of the humidity control system;

[0038] Figure 5 It is the design schematic diagram of the pressure control system;

[0039] Figure 6 It is the design schematic diagram of the leakage introduction system. Detailed Embodiments

[0040] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of the present invention.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0042] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connection", "installation", "fixation", etc. 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] The present invention provides a simulation test system for the tightness of a nuclear power plant containment, including: a containment simulation body, a charging and discharging system, a pressure relief system, a collection system, an analysis system, a temperature control system, a humidity control system, a pressure control system, and a leakage introduction system.

[0045] The charging and discharging system is connected to the containment simulation body and is used to charge / discharge gas into / from the inside of the containment simulation body so that the pressure inside the containment simulation body reaches a preset test pressure.

[0046] The pressure relief system is connected between the containment simulation body and the atmospheric environment and is used to relieve the pressure of the containment simulation body so that it returns to atmospheric pressure.

[0047] The temperature control system is connected to the containment simulation body and is used to simulate the heating of the gas inside the containment simulation body by the key heat sources inside the containment so that the temperature of the gas inside the containment simulation body is maintained at a preset test temperature, or the gas inside the containment simulation body is heated or cooled at a set rate.

[0048] The humidity control system is connected to the containment simulation body and is used to simulate the humidification of the gas inside the containment simulation body by the key water sources inside the containment so that the humidity of the gas inside the containment simulation body is maintained at a preset test humidity, or the gas inside the containment simulation body is humidified at a set rate.

[0049] The pressure control system is connected to the containment simulation body and is used to charge / discharge gas into / from the inside of the containment simulation body so that the pressure inside the containment simulation body is maintained at a preset test pressure.

[0050] The leakage introduction system is connected to the containment simulation body and is used to introduce a set leakage amount of gas at different positions of the containment simulation body.

[0051] The collection system is used to collect the gas parameters of the containment simulation body and each module. The analysis system is electrically connected to the collection system and is used to determine the leakage rate of the containment simulation body according to the data collected by the collection system after the pressure inside the containment simulation body reaches or maintains a preset test pressure.

[0052] Example 1:

[0053] As Figure 1 shown, this embodiment provides a simulation test system for the tightness of a nuclear power plant containment, including: a containment simulator 1, a filling and discharging system 6, a pressure relief system 7, a data acquisition system 8, an analysis system 9, a temperature control system 2, a humidity control system 3, a pressure control system 4, and a leakage introduction system 5.

[0054] The filling and discharging system 6 is connected to the containment simulator 1 and is used to fill / discharge gas into / from the inside of the containment simulator 1 so that the pressure inside the containment simulator 1 reaches a preset test pressure.

[0055] The pressure relief system 7 is connected between the containment simulator 1 and the atmospheric environment and is used to relieve the pressure of the containment simulator 1 to restore it to atmospheric pressure.

[0056] The temperature control system 2 is connected to the containment simulator 1 and is used to simulate the heating of the gas inside the containment simulator 1 by the key heat sources inside the containment, so that the temperature of the gas inside the containment simulator 1 is maintained at a preset test temperature, or the gas inside the containment simulator 1 is heated or cooled at a set rate.

[0057] The humidity control system 3 is connected to the containment simulator 1 and is used to simulate the humidification of the gas inside the containment simulator 1 by the key water sources inside the containment, so that the humidity of the gas inside the containment simulator 1 is maintained at a preset test humidity, or the gas inside the containment simulator 1 is humidified at a set rate.

[0058] The pressure control system 4 is connected to the containment simulator 1 and is used to fill / discharge gas into / from the inside of the containment simulator 1 so that the pressure inside the containment simulator 1 is maintained at a preset test pressure.

[0059] The leakage introduction system 5 is connected to the containment simulator 1 and is used to introduce a set leakage amount of gas at different positions of the containment simulator 1.

[0060] The data acquisition system 8 is used to acquire the gas parameters of the containment simulator 1 and each module. The analysis system 9 is electrically connected to the data acquisition system 8 and is used to determine the leakage rate of the containment simulator 1 according to the data acquired by the data acquisition system 8 after the pressure inside the containment simulator 1 reaches or is maintained at a preset test pressure.

[0061] Specifically, as Figure 1 shown, the containment simulator 1, the filling and discharging system 6, the pressure relief system 7, the data acquisition system 8, and the analysis system 9 constitute the basic configuration part of the tightness test, realizing the pressure increase, pressure decrease inside the shell, and data acquisition and data analysis on the pressure platform.

[0062] The charging and discharging system 6 in this embodiment includes a charging system and a discharging system. The charging system can charge the containment simulator 1 to make the containment simulator 1 under positive pressure, simulating the leakage rate test of the inner containment; the discharging system evacuates the containment simulator 1 to make the containment simulator 1 under slightly negative pressure, simulating the leakage rate test of the outer containment.

[0063] After the charging and discharging system 6 adjusts the pressure of the containment simulator 1 to the preset test pressure, the charging and discharging system 6 is closed. The parameters of the gas in the containment simulator 1 are collected by the acquisition system 8, and then the leakage rate of the containment simulator 1 can be obtained through calculation by the analysis system 9. This is the measurement of the leakage rate by the conventional pressure drop method, that is, the basic configuration part can meet the basic requirements of the containment tightness test of nuclear power plants.

[0064] Continue to refer to Figure 1 , the temperature control system 2, the humidity control system 3, the pressure control system 4, and the leakage introduction system 5 constitute the scientific research environment configuration part, realizing the change control of factors such as temperature, humidity, pressure, and leakage inside the shell.

[0065] During the containment tightness test of nuclear power plants, the temperature inside the shell is not constant. So, does the change in temperature affect leakage? To provide an opportunity for in-depth research for nuclear power technicians, a temperature control system 2 is designed in the comprehensive scientific research platform of this embodiment. By controlling the temperature platform inside the containment simulator 1, the influence of the temperature platform on the leakage rate is studied, and by controlling the temperature change rate inside the containment simulator, the influence of the temperature change rate on the leakage rate is studied. In addition, by arranging the heat sources of the nuclear power plant containment, the influence of local heat sources on the leakage rate can be studied.

[0066] During the containment tightness test of nuclear power plants, the humidity inside the shell is not constant. So, does the change in humidity affect leakage? To provide an opportunity for in-depth research for nuclear power technicians, a humidity control system 3 is designed in the comprehensive scientific research platform of this embodiment. By controlling the humidity platform inside the containment simulator 1, the influence of the humidity platform on the leakage rate is studied, and by controlling the humidity change rate inside the containment simulator, the influence of the humidity change rate on the leakage rate is studied.

[0067] During the pressure drop method containment tightness test of nuclear power plants, the pressure inside the shell gradually decreases. So, does the pressure change affect leakage? What is the deviation between the leakage rate obtained from the continuously decreasing pressure and the leakage rate of the specified pressure platform? To provide an opportunity for in-depth research for nuclear power technicians, a pressure control system 4 is designed in the comprehensive scientific research platform of this embodiment to study the influence of the pressure platform on the leakage rate.

[0068] After the charging and discharging system 6 charges and discharges gas into the containment simulator 1 until the pressure reaches the preset test pressure, the flow rate of gas charged / discharged into the containment simulator 1 is then controlled by the pressure control system 4, so that the pressure inside the containment simulator 1 is maintained at the preset test pressure. Then, the parameters of the gas inside the containment simulator 1 and the parameters of the gas charged / discharged into the containment simulator 1 by the pressure control system 4 are collected by the acquisition system 8. The analysis system 9 calculates the base leakage flow rate using the parameters of the gas inside the containment simulator 1, and also calculates the compensation leakage flow rate using the parameters of the gas charged / discharged into the containment simulator 1 by the pressure control system 4. The combination of the two can obtain the leakage rate of the containment simulator 1. This is a brand-new constant pressure method to measure the leakage rate of the containment. Since the pressure inside the shell is maintained constant, it effectively improves the fitting deviation caused by the rapid and monotonic decrease of pressure in the traditional pressure drop method (the actual value of the leakage rate of the containment under constant pressure will also be a fixed value, and at this time, linear fitting is very accurate); moreover, this method only requires one continuous test to obtain accurate data on the leakage rate of the containment simulator in a slightly negative pressure environment; while the traditional pressure drop method for measuring the leakage rate in a slightly negative pressure environment requires at least 6 repeated tests to obtain the fitted estimated value, so the constant pressure method greatly reduces the number of tests and saves time costs.

[0069] By comparing the leakage rates measured by the pressure drop method and the constant pressure method, the deviation of the leakage rates measured by the two can be analyzed and obtained.

[0070] During the hermeticity test of the nuclear power plant containment, the location and proportion of leakage from the inside of the containment to the outside are unknown, but the pressure measurement points, temperature measurement points, and humidity measurement points inside the shell are fixed. Then, under the condition that the measurement points are fixed, does the leakage location and the size of the leakage have an impact on the measurement of the containment leakage rate? To provide an opportunity for in-depth research for nuclear power technicians, a leakage introduction system 5 is designed in the comprehensive scientific research platform, and the impact of different leakage locations on the leakage rate is studied by controlling the proportion of leakage in different parts of the containment.

[0071] To verify the influence of different leakage positions and different leakage sizes on the measurement of the containment leakage rate, after the leakage rate test is completed, different amounts of gas with different set leakage rates can be introduced at different positions of the containment simulator 1 through the leakage introduction system 5 on the basis of the original test. Then, the containment leakage rate is measured again. According to the containment leakage rates of the introduction test and the original test, the calculated value of the reference leakage rate can be obtained. And according to the parameters of the gas filled into the containment simulator 1 by the leakage introduction system 5, the introduced value of the reference leakage rate can be determined. The change rate of the reference leakage rate is calculated from the calculated value of the reference leakage rate and the introduced value of the reference leakage rate. By designing the leakage introduction system 5 to introduce a known leakage flow rate and obtaining the leakage rate after superimposing the known leakage flow rate, it can be used to evaluate the reliability of the measurement of the outer containment leakage rate. Moreover, the influence of different leakage positions and different leakage sizes on the measurement of the containment leakage rate can be verified therefrom.

[0072] In summary, the comprehensive scientific research platform for the containment sealability test research of nuclear power plants proposed by the present invention is a scientific research platform dedicated to carrying out research on the theory and test methods of the containment sealability test of nuclear power plants, providing a large-scale and comprehensive platform for domestic nuclear power plants and nuclear power design units to carry out research on the mechanism of the containment sealability test. On the basis of the basic requirements of the containment sealability test of nuclear power plants, the control of environmental factors is innovatively introduced to establish environments under various working conditions to complete scientific research that cannot be carried out in nuclear power plants, including research on the influence of temperature control, research on the influence of humidity control, research on the influence of pressure control, research on the influence of leakage position, etc.

[0073] The comprehensive scientific research platform for the containment sealability test research of nuclear power plants proposed by the present invention has been constructed by the inventor unit and has very precisely realized the environmental control functions commonly used in scientific research through test verification, including temperature platform control, temperature change rate control, humidity platform control, humidity change rate control, pressure platform control, leakage position control, etc.; in addition, the comprehensive scientific research platform also reserves expansion interfaces for other new types of research in the form of spare penetration holes.

[0074] The containment simulator 1 in this embodiment has a shell volume exceeding 1000 m 3 , and the height is about 20 m. Referring to the layout of the nuclear power plant bottom plate, main pump, evaporator, pressure vessel, 20 m platform, and dome, a bottom head, an annular gallery + compartment layer, a straight cylinder section, and a top head are arranged inside the shell. Among them, the compartments are divided into two layers, and 6 compartments and 1 central compartment are annularly distributed on each layer.

[0075] In this embodiment, the temperature control system 2 includes a first group of electric heating elements 21 arranged at the central position of the containment simulator 1, a second group of electric heating elements 22 arranged at the corresponding position of the containment simulator 1 and the containment bottom head, a third group of electric heating elements 23 arranged at the corresponding position of the containment simulator 1 and the first layer compartment of the containment, a fourth group of electric heating elements 24 arranged at the corresponding position of the containment simulator 1 and the second layer compartment of the containment, and a fifth group of electric heating elements 25 arranged at the corresponding position of the containment simulator 1 and the upper space of the containment. A plurality of electric heating elements of the first group of electric heating elements 21 are arranged at intervals along the height direction of the containment simulator 1, and a plurality of electric heating elements of each of the remaining groups are arranged at intervals along the circumferential direction of the containment simulator 1.

[0076] In this embodiment, the temperature control system 2 further includes a plurality of temperature control units, and the plurality of temperature control units correspond to the plurality of groups of electric heating elements one by one.

[0077] Each temperature control unit includes a temperature sensor, a PID temperature controller and a manual power regulator. The temperature sensor is arranged near the corresponding electric heating element. The temperature sensor is electrically connected to the corresponding PID temperature controller and manual power regulator respectively. The electric heating element is electrically connected to the corresponding PID temperature controller and manual power regulator respectively. The temperature sensor measures the temperature of the gas near the corresponding electric heating element and transmits it to the PID temperature controller and the manual power regulator. The PID temperature controller or the manual power regulator adjusts the power of the corresponding electric heating element according to the data transmitted by the temperature sensor.

[0078] The temperature control system 2 is designed with reference to the positions of three key heat sources, namely, the reactor pressure vessel, the main pump, and the steam generator, inside the containment of a nuclear power plant. It includes 5 groups of dispersedly arranged electric heating elements. Each group of electric heating elements is equipped with a set of temperature sensor, PID control unit, and manual power regulator for signal feedback, which are used to independently adjust the heating power of each group of electric heating elements. The comprehensive scientific research platform realizes the control of the in-containment temperature platform, the control of the temperature change rate, and the simulation of local heat sources through 5 groups of electric heating elements.

[0079] The total power of the electric heating elements is designed according to the heating capacity of raising the in-containment temperature by 10 °C in 2 hours, and the total power is 64 kW. The first group consists of 4 electric heating elements of 4 kW, which are respectively arranged at the central positions at four different heights. Each of the 2-5 groups consists of 6 dispersedly arranged electric heating elements of 2 kW. The second group is arranged at the bottom head, the third group is arranged inside the first layer compartment, the fourth group is arranged inside the second layer compartment, and the fifth group is arranged in the upper part; the schematic diagram of the distribution of the heating elements is as Figure 2 and Figure 3 shown.

[0080] The above-mentioned temperature control system 2 constructed by the present invention realizes the temperature platform control inside a large housing, with a control accuracy reaching ±0.2°C, very accurately realizing the research on the influence of the temperature platform on the leakage rate; and realizes the control of the temperature change rate inside the large housing, very accurately realizing the research on the influence of the temperature change rate on the leakage rate; in addition, by arranging heat sources by simulating the heat sources of a nuclear power plant containment, it can be used to carry out research on the influence of local heat sources on the leakage rate.

[0081] 1) Temperature platform control scheme

[0082] The temperature platform control needs to enable the PID automatic control function. Currently, through continuous testing, the PID parameters corresponding to 5 groups of electric heating elements have been obtained, and the internal temperature of the large-scale containment simulation body has been successfully controlled within the range of the target temperature ±0.2°C. The steps for platform control and modification are as follows:

[0083] 1.1) Power on the temperature control system 2 to make the system in an operating state;

[0084] 1.2) Set the target temperature T1 and the corresponding PID parameters;

[0085] 1.3) The electric heating elements will enter the heating state, and the heating rate will be automatically adjusted by PID control;

[0086] 1.4) Under the action of PID, the temperature inside the housing will stabilize at the T1 temperature platform with small fluctuations;

[0087] 1.5) If you want to adjust the temperature platform, repeat steps 1.2 - 1.4.

[0088] 2) Temperature change rate control scheme

[0089] The temperature change rate control needs to adopt the manual power regulator control function. Currently, through continuous testing, the relationship between the temperature change rate inside the containment simulation body and the heating power has been obtained, and the internal temperature heating rate of the large-scale containment simulation body has been successfully controlled, as well as the cooling rate control within a certain range. The steps for temperature change rate control are as follows:

[0090] 2.1) Power on the temperature control system 2 to make the system in an operating state;

[0091] 2.2) According to the temperature change rate to be achieved, set the heating power of each group of electric heating elements;

[0092] 2.3) The electric heating elements will enter the heating state, and the heating rate inside the housing can be monitored in real time through the acquisition system;

[0093] 2.4) The higher the temperature, the faster the heat dissipation. If the target temperature is relatively high, it is necessary to continuously adjust the heating power according to the real-time temperature;

[0094] 2.5) The maximum value of the cooling rate is the cooling rate without heating. If it is necessary to delay the cooling, the corresponding heating power can be introduced according to the required cooling rate to compensate for part of the heat dissipated.

[0095] 3) Implementation scheme of local heat source simulation

[0096] For local heat source simulation, only the electric heating elements at the corresponding positions are started, and the heating elements at the other positions are in the shutdown state.

[0097] For local heat source simulation, select the heating elements to be operated and perform local continuous heating at a certain power to simulate the environment where there is a continuous heat source generating heat at the corresponding position inside the containment.

[0098] In this embodiment, as Figure 4 shown, the humidity control system 3 includes a humidification module 31. The humidification module 31 includes a water storage tank 311, a main process pipeline 312, a booster pump 313, a filter 320, a humidification flow transmitter 314, a first group of spray heads 315, a second group of spray heads 316, and a third group of spray heads 317. The water storage tank 311 is connected to an external water source. One end of the main process pipeline 312 is connected to the water storage tank 311, and the other end extends upward to the position corresponding to the upper head of the containment simulation body 1. The booster pump 313, the filter 320, and the humidification flow transmitter 314 are arranged on the main process pipeline 312. The first group of spray heads 315 is arranged at the position corresponding to the bottom head of the containment simulation body 1. The second group of spray heads 316 is arranged at the position corresponding to the top of the second compartment of the containment simulation body 1. The third group of spray heads 317 is arranged at the position corresponding to the upper head of the containment simulation body 1. The first group of spray heads 315, the second group of spray heads 316, and the third group of spray heads 317 are all connected to the main process pipeline 312 through branch pipes, and solenoid valves are arranged on both the main process pipeline 312 and the branch pipes;

[0099] The humidification flow transmitter 314 is electrically connected to the acquisition system 8. A liquid level gauge 318 is arranged in the water storage tank 311, and the liquid level gauge 318 is electrically connected to the acquisition system 8.

[0100] In addition, the humidification module 31 further includes a plurality of condensate recovery pipes connected to the main process pipeline 312, and solenoid valves are also arranged on the condensate recovery pipes.

[0101] In this embodiment, the humidity control system 3 further includes a dehumidification module 32. The dehumidification module 32 includes a dryer 321, a circulation fan 322, and a circulation pipe 323. Both ends of the circulation pipe 323 extend into the containment simulation body 1. The dryer 321 and the circulation fan 322 are both arranged on the circulation pipe 323. The circulation fan 322 is used to draw the gas inside the containment simulation body 1 into the dryer 321 for drying and then send it back into the containment simulation body 1. An isolation valve is arranged on the circulation pipe 323.

[0102] The humidification module 31 is designed with reference to the water source positions such as the sump / built-in refueling water tank, main process pipelines, spent fuel pool, and in-containment spray inside the containment of the nuclear power plant. Three groups of high-pressure micro-mist nozzles are arranged annularly at three different heights. The first group is located at the bottom head, the second group is located at the top of the second compartment, and the third group is located at the upper head. The humidification module 31 is supplied with tap water. After buffering and exhausting air through the external storage tank 319 outside the containment, it enters the storage tank 311 arranged inside the containment through the double containment isolation valve. The liquid level gauge 318 installed on the storage tank 311 can feedback the liquid level signal in the tank to the acquisition system 8 for alarming high and low liquid levels. The booster pump 313 downstream of the storage tank 311 can increase the pressure in the downstream pipeline to 4 MPa to achieve spraying of high-pressure micro-mist (spraying can start when the pressure is 1.5 MPa). The humidification flow transmitter 314 on the pipeline can monitor the spraying flow rate and control the humidification rate. The solenoid valves on each pipeline can control the switching of the operation loop to achieve functions such as spray water recovery and spraying and humidifying at different positions.

[0103] The dehumidification module 32 is used to dry the air inside the containment without reducing the pressure on the pressure platform, which can effectively reduce the humidity inside the containment. It is mainly used to quickly establish the humidity environment required for the next test research after humidification inside the containment. The dehumidification module 32 consists of a circulation loop connected to the inside of the containment. The loop includes a circulation fan 322, an isolation valve, a dryer 321, etc.

[0104] The above-mentioned humidity control system 3 constructed by the present invention realizes the control of the humidity platform inside the large containment, and very precisely realizes the research on the influence of the humidity platform on the leakage rate. Moreover, it realizes the control of the humidity change rate inside the large containment, and very precisely realizes the research on the influence of the humidity change rate on the leakage rate.

[0105] 4) Humidity platform control scheme

[0106] The control of the humidity platform inside the containment simulator 1 is realized through means such as pre-analysis by calculation, introduction of high-pressure micro-mist, and flow monitoring. The specific steps are as follows:

[0107] 4.1) Inject water into the storage tank 311 inside the containment through the external storage tank 319 outside the containment and two external isolation valves. After completion, close the external isolation valves;

[0108] 4.2) Monitor the humidity distribution inside the current containment through the acquisition system 8, calculate the average humidity, and calculate the water vapor content inside the containment;

[0109] 4.3) Determine the target humidity platform and calculate the water vapor content of the target humidity platform;

[0110] 4.4) Determine the amount of water vapor to be introduced into the containment;

[0111] 4.5) Open the solenoid valve at the inlet of the booster pump and the isolation valves on each branch pipe;

[0112] 4.6) Start the booster pump 313 and record the data of the humidification flow transmitter 314 through the acquisition system 8;

[0113] 4.7) When the cumulative flow of the humidification flow transmitter 314 reaches the calculated amount of water vapor to be introduced, turn off the booster pump 313;

[0114] 4.8) Close the solenoid valve at the inlet of the booster pump, and the isolation valves on each branch pipe remain open;

[0115] 4.9) Wait for a period of time, observe the change of data at each humidity measurement point inside the shell through the acquisition system 8, and calculate the average humidity inside the shell after determining that the water vapor introduced by the high-pressure micro-mist has diffused in place;

[0116] 4.10) If continuous humidification is required, repeat steps 4.2 - 4.9.

[0117] If it is necessary to reduce the humidity inside the shell to achieve a low-humidity platform, the dehumidification module 32 needs to be started, and the steps are as follows:

[0118] 4.11) Open the two isolation valves on the circulation pipe 323;

[0119] 4.12) Start the dryer 321 and keep the dryer 321 in the running state;

[0120] 4.13) Start the circulation fan 322, and return the wet air inside the shell to the inside of the shell after drying by the external shell dryer 321;

[0121] 4.14) Observe the change of data at each humidity measurement point inside the shell through the acquisition system 8, calculate the average humidity inside the shell, and immediately stop the operation of the dryer 321 when the calculated average humidity is close to the target humidity;

[0122] 4.15) Keep the circulation fan 322 running, continuously observe the change of data at each humidity measurement point inside the shell through the acquisition system 8 for a period of time, calculate the humidity inside the shell, and confirm whether continuous dehumidification is required;

[0123] 4.16) If continuous dehumidification is required, repeat steps 4.12, 4.14, and 4.15; if continuous dehumidification is not required, go to step 4.17;

[0124] 4.17) Stop the operation of the circulation fan 322;

[0125] 4.18) Close the two isolation valves on the circulation pipe 323.

[0126] 5) Humidity change rate control scheme

[0127] The control of the humidity change rate essentially aims to control the water vapor flow rate diffused into the atmosphere inside the shell. On the comprehensive scientific research platform, it is achieved through the frequency conversion control of the booster pump 313. The operating frequency of the booster pump 313 directly affects the pressure and spray flow rate downstream of the booster pump 313. Combining with the flowmeter on the pipeline, the humidification rate can be effectively controlled. The implementation steps are as follows:

[0128] 5.1) Confirm the humidification rate to be achieved and calculate the spray flow rate that needs to be introduced at this rate;

[0129] 5.2) Open the solenoid valve at the inlet of the booster pump 313 and the isolation valves on each branch pipe;

[0130] 5.3) Start the booster pump 313. Starting from 0, gradually increase the operating frequency of the booster pump 313, and record the data of the humidification flow transmitter 314 through the acquisition system 8 until the flow rate of the humidification flow transmitter 314 reaches the calculated spray flow rate to be introduced.

[0131] In this embodiment, as Figure 5 shown, the pressure control system 4 includes an internal positive pressure control module 41 and an internal negative pressure control module 42. The internal positive pressure control module 41 is used to fill the gas into the containment simulator 1 to maintain the pressure inside the containment simulator 1 at a preset test pressure. The internal negative pressure control module 42 is used to evacuate the gas inside the containment simulator 1 to maintain the pressure inside the containment simulator 1 at a preset test pressure.

[0132] In this embodiment, the internal positive pressure control module 41 includes a positive pressure PID control unit, a charging pipeline 412, and an emergency air compressor 413, an air storage tank 420, a dryer 419, a positive pressure electric control valve 414, a positive pressure flow transmitter 415, a positive pressure pressure transmitter 416, a positive pressure temperature transmitter 417, and a positive pressure humidity transmitter 418 located on the charging pipeline 412. The charging pipeline 412 is connected to the containment simulator 1, and a positive pressure isolation valve 411 is also provided thereon.

[0133] The positive pressure flow transmitter 415, the positive pressure pressure transmitter 416, the positive pressure temperature transmitter 417, and the positive pressure humidity transmitter 418 are all electrically connected to the acquisition system 8.

[0134] The acquisition system 8, the positive pressure PID control unit, and the positive pressure electric control valve 414 are electrically connected in sequence. The positive pressure PID control unit adjusts the opening degree of the positive pressure electric control valve 414 according to the gas parameters in the charging pipeline 412 collected by the acquisition system 8 and the gas parameters inside the containment simulator 1, so as to maintain the pressure inside the containment simulator 1 at a preset test pressure.

[0135] In this embodiment, the shell negative pressure control module 42 includes a negative pressure PID control unit, an exhaust pipe 422, and an exhaust fan 423, a negative pressure electric regulating valve 424 and a negative pressure flow transmitter 425 located on the exhaust pipe 422. The exhaust pipe 422 is connected to the containment shell simulation body 1 and is also provided with a negative pressure isolation valve 411.

[0136] The negative pressure flow transmitter 425, the acquisition system 8, the negative pressure PID control unit and the negative pressure electric regulating valve 424 are electrically connected in sequence. The negative pressure PID control unit adjusts the opening of the negative pressure electric regulating valve 424 according to the parameters of the gas in the exhaust pipeline 422 collected by the acquisition system 8 and the gas parameters in the containment simulation body 1, so that the pressure inside the containment simulation body 1 maintains the preset test pressure.

[0137] In this embodiment, the pressure control system 4 also includes a pressure-guiding network 43, which is located in the containment simulation body 1 and is connected to the inflation pipeline 412 and the exhaust pipeline 422 respectively. It is used to divert the gas in the inflation pipeline 412 and flow it into different positions in the containment simulation body 1, or to gather the gas in the containment simulation body 1 and enter the exhaust pipeline 422.

[0138] The setting of the pressure-inducing pipe network 43 is an innovation in the technical solution for the containment sealing test of nuclear power plants. Compared with the solution with only one pipe opening, the pressure-inducing pipe network 43 plays the role of flow distribution and breaking down the whole into parts, reducing the airflow disturbance caused by the inflation process inside the shell. It is not only effective in pressure platform control, but is also applicable during the containment pressurization process.

[0139] The pressure control system 4 constructed by the present invention realizes the control of the pressure platform in a large shell with a control accuracy of ±0.5 kPa, and very accurately realizes the study of the influence of the pressure platform on the leakage rate.

[0140] 6) Pressure platform control solution

[0141] The goal of pressure platform control is to improve the problem of continuous pressure drop in the containment shell by the traditional pressure drop method, and to achieve a constant pressure state in the containment shell. In the integrated scientific research platform, pressure platform control is achieved through the feedback of the pressure in the containment shell and PID automatic control of the air replenishment flow. The steps to achieve constant pressure control in the containment shell are as follows:

[0142] 6.1) Pressurize the containment vessel through the inflation system. Once the target pressure is reached, shut down the inflation system and isolate the containment vessel.

[0143] 6.2) Start the emergency air compressor 413 and dryer 419 on the inflation line 412;

[0144] 6.3) Open the positive pressure isolation valve 411 on the inflation line 412;

[0145] 6.4) In the PID control corresponding to the positive pressure electric control valve 414, set the target pressure P;

[0146] 6.5) Through the acquisition system 8, the average pressure inside the shell is obtained in real time and fed back to the positive pressure PID control unit to automatically adjust the opening degree of the positive pressure electric control valve 414 so as to adapt to the fact that the pressure inside the shell is always the target pressure P.

[0147] The above is the control process for the positive pressure platform inside the shell, which is generally used for the research of the (inner) containment seal test. For the outer containment seal test, it is necessary to maintain the pressure inside the shell at a constant slightly negative pressure, and the implementation steps are as follows:

[0148] 6.1) Open the negative pressure isolation valve 411 on the exhaust pipe 422;

[0149] 6.2) In the PID control corresponding to the negative pressure electric control valve 424, set the target pressure P1;

[0150] 6.3) Start the exhaust fan 423;

[0151] 6.4) Through the data acquisition system, the average pressure inside the shell is obtained in real time and fed back to the negative pressure PID control unit to automatically adjust the opening degree of the negative pressure electric control valve 424 so as to adapt to the fact that the pressure inside the shell is always the target pressure P1.

[0152] In this embodiment, as Figure 6 shown, the leakage introduction system 5 includes a leakage introduction unit 51 and a plurality of leakage measurement point units 52. The plurality of leakage measurement point units 52 are respectively arranged at different positions of the containment simulator 1. The leakage measurement point unit 52 includes an access pipe 521 and a quick connector 522. One end of the access pipe 521 extends into the containment simulator 1, and the other end is connected to the quick connector 522. An isolation valve is provided on the access pipe 521;

[0153] The leakage introduction unit 51 includes an introduction PID controller, an introduction pipeline 512, and an introduction electric control valve 513, an introduction flow transmitter 514, an introduction pressure transmitter 515, an introduction temperature transmitter 516, and an introduction humidity transmitter 517 located on the introduction pipeline 512. One end of the introduction pipeline 512 is used to communicate with the corresponding access pipe 521 through the quick connector 522, and the other end is used to be connected to an exhaust device or an inflation device.

[0154] The introduction flow transmitter 514, the introduction pressure transmitter 515, the introduction temperature transmitter 516, and the introduction humidity transmitter 517 are all electrically connected to the acquisition system 8.

[0155] The acquisition system 8, the introduced PID controller, and the introduced electric control valve 513 are electrically connected in sequence. The introduced PID controller adjusts the opening degree of the positive pressure electric control valve 414 according to the parameters of the gas in the introduced pipeline 512 collected by the acquisition system 8, so that the leakage introduction system 5 introduces a set leakage volume of gas into the containment simulator 1.

[0156] Specifically, for the leakage introduction system 5 of this embodiment, five leakage rate access pipelines are provided on the containment simulator 1. Each access pipeline is located at a different position, with different heights or angles. In this way, the desired leakage volume can be introduced at five different positions as needed, and the proportion of the leakage volume at different positions can be changed. An isolation valve and an out-of-shell quick connector 522 are provided on each leakage access pipe 521. The core control and measurement parts include an introduced flow transmitter 514, an introduced pressure transmitter 515, an introduced temperature transmitter 516, and an introduced humidity transmitter 517. The five leakage rate access pipelines are directly connected to the same control and introduction part downstream of the out-of-shell isolation valve, and the interference introduced by the out-of-shell system is eliminated through the same control components and measuring instruments.

[0157] The above-mentioned leakage introduction system 5 constructed by the present invention realizes the control of the leakage proportion in different parts of the large shell, and very precisely realizes the research on the influence of different leakage positions on the leakage rate.

[0158] 7) Leakage position control scheme

[0159] The same leakage rate is introduced at different leakage positions, so as to compare the influence of different positions on the leakage rate measurement. In the comprehensive scientific research platform, this research can be well carried out.

[0160] The steps to implement this research process are as follows:

[0161] 7.1) Determine the leakage size Q to be introduced for research;

[0162] 7.2) Start the data acquisition system, continuously monitor and record the instrument data of the leakage position control system, including the data of the introduced flow transmitter 514, the introduced pressure transmitter 515, the introduced temperature transmitter 516, and the introduced humidity transmitter 517;

[0163] 7.3) Connect the inlet 511 of the leakage introduction unit 51 to the leakage control position 1 (the first leakage measurement point unit 52);

[0164] 7.4) Open the isolation valve on the pipeline of the leakage control position 1;

[0165] 7.5) Slowly and gradually open the introduced electric control valve 513 until the data of the introduced flow transmitter 514 is consistent with the target leakage flow Q;

[0166] 7.6) Calculate the containment leakage when introducing leakage Q at the leakage control position 1 through the acquisition system 8 and the analysis system 9;

[0167] 7.7) After completing the calculation, close the isolation valve on the pipeline of the leakage control position 1 and perform self-sealing treatment on the quick connector;

[0168] 7.8) Connect the inlet 511 of the leakage introduction unit 51 to the leakage control position 2 (the second leakage measurement point unit 52);

[0169] 7.9) Open the isolation valve on the pipeline of the leakage control position 2;

[0170] 7.10) Slowly and gradually open the introduced electric control valve 513 until the data of the introduced flow transmitter 514 is consistent with the target leakage flow rate Q;

[0171] 7.11) Calculate the containment leakage when introducing leakage Q at the leakage control position 2 through the acquisition system 8 and the analysis system 9;

[0172] 7.12) After completing the calculation, close the isolation valve on the pipeline of the leakage control position 2 and perform self-sealing treatment on the quick connector;

[0173] 7.13) Connect the inlet 511 of the leakage introduction unit 51 to the leakage control position 3 (the third leakage measurement point unit 52);

[0174] 7.14) Open the isolation valve on the pipeline of the leakage control position 3;

[0175] 7.15) Slowly and gradually open the introduced electric control valve 513 until the data of the introduced flow transmitter 514 is consistent with the target leakage flow rate Q;

[0176] 7.16) Calculate the containment leakage when introducing leakage Q at the leakage control position 3 through the data acquisition system and the data analysis system;

[0177] 7.17) After completing the calculation, close the isolation valve on the pipeline of the leakage control position 3 and perform self-sealing treatment on the quick connector;

[0178] 7.18) Connect the inlet 511 of the leakage introduction unit 51 to the leakage control position 4 (the fourth leakage measurement point unit 52);

[0179] 7.19) Open the isolation valve on the pipeline of the leakage control position 4;

[0180] 7.20) Slowly and gradually open the introduced electric control valve 513 until the data of the introduced flow transmitter 514 is consistent with the target leakage flow rate Q;

[0181] 7.21) Calculate the containment leakage when introducing leakage Q at the leakage control position 4 through the data acquisition system and the data analysis system;

[0182] 7.22) After the calculation is completed, close the isolation valve on the pipeline of the leakage control position 4, and perform self-sealing treatment on the quick-connect fitting;

[0183] 7.23) Connect the inlet 511 of the leakage introduction unit 51 to the leakage control position 5 (the fifth leakage measurement point unit 52);

[0184] 7.24) Open the isolation valve on the pipeline of the leakage control position 5;

[0185] 7.25) Slowly and gradually introduce the electric control valve 513 until the data of the flow transmitter 514 is consistent with the target leakage flow rate Q;

[0186] 7.26) Calculate the containment leakage when introducing leakage Q at the leakage control position 5 through the data acquisition system and the data analysis system;

[0187] 7.27) After the calculation is completed, close the isolation valve on the pipeline of the leakage control position 5, and perform self-sealing treatment on the quick-connect fitting.

[0188] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A containment seal tightness simulation test system for nuclear power plants, characterized in that, Including: Containment simulator (1), filling and discharging system (6), pressure relief system (7), acquisition system (8), analysis system (9), temperature control system (2), humidity control system (3), pressure control system (4), leakage introduction system (5), The filling and discharging system (6) is connected to the containment simulator (1) and is used to fill / discharge gas into / from the inside of the containment simulator (1) so that the pressure inside the containment simulator (1) reaches a preset test pressure. The pressure relief system (7) is connected between the containment simulator (1) and the atmospheric environment and is used to relieve the pressure of the containment simulator (1) so that it returns to atmospheric pressure. The temperature control system (2) is connected to the containment simulator (1) and is used to simulate the key heat source inside the containment to heat the gas inside the containment simulator (1) so that the temperature of the gas inside the containment simulator (1) is maintained at a preset test temperature, or the gas inside the containment simulator (1) is heated or cooled at a set rate. The humidity control system (3) is connected to the containment simulator (1) and is used to simulate the key water source inside the containment to humidify the gas inside the containment simulator (1) so that the humidity of the gas inside the containment simulator (1) is maintained at a preset test humidity, or the gas inside the containment simulator (1) is humidified at a set rate. The pressure control system (4) is connected to the containment simulator (1) and is used to fill / discharge gas into / from the inside of the containment simulator (1) so that the pressure inside the containment simulator (1) is maintained at a preset test pressure. The pressure control system (4) includes an in-containment positive pressure control module (41) and an in-containment negative pressure control module (42). The in-containment positive pressure control module (41) is used to fill gas into the containment simulator (1) so that the pressure inside the containment simulator (1) is maintained at a preset test pressure. The in-containment negative pressure control module (42) is used to evacuate the gas inside the containment simulator (1) so that the pressure inside the containment simulator (1) is maintained at a preset test pressure. The leakage introduction system (5) is connected to the containment simulator (1) and is used to introduce a set leakage amount of gas at different positions of the containment simulator (1). The acquisition system (8) is used to acquire the gas parameters of the containment simulator (1) and each module. The analysis system (9) is electrically connected to the acquisition system (8) and is used to determine the leakage rate of the containment simulator (1) according to the data acquired by the acquisition system (8) after the pressure inside the containment simulator (1) reaches or is maintained at a preset test pressure.

2. The nuclear power plant containment sealability simulation test system according to claim 1, wherein, The temperature control system (2) includes a first group of electric heating elements (21) arranged at the central position of the containment simulator (1), a second group of electric heating elements (22) arranged at the corresponding position of the containment simulator (1) and the bottom head of the containment, a third group of electric heating elements (23) arranged at the corresponding position of the containment simulator (1) and the first compartment of the containment, a fourth group of electric heating elements (24) arranged at the corresponding position of the containment simulator (1) and the second compartment of the containment, and a fifth group of electric heating elements (25) arranged at the corresponding position of the containment simulator (1) and the upper space of the containment. A plurality of electric heating elements of the first group of electric heating elements (21) are arranged at intervals along the height direction of the containment simulator (1), and a plurality of electric heating elements of each of the remaining groups are arranged at intervals along the circumferential direction of the containment simulator (1).

3. The nuclear power plant containment seal tightness simulation test system according to claim 2, wherein the temperature control system (2) further includes a plurality of temperature control units, and the plurality of temperature control units correspond to the plurality of groups of electric heating elements one by one, each temperature control unit includes a temperature sensor, a PID temperature controller and a manual power regulator. The temperature sensor is arranged near the corresponding electric heating element, and the temperature sensor is electrically connected to the corresponding PID temperature controller and manual power regulator respectively. The electric heating element is electrically connected to the corresponding PID temperature controller and manual power regulator respectively. The temperature sensor measures the temperature of the gas near the corresponding electric heating element and transmits it to the PID temperature controller and the manual power regulator. The PID temperature controller or the manual power regulator adjusts the power of the corresponding electric heating element according to the data transmitted by the temperature sensor.

4. The nuclear power plant containment seal tightness simulation test system according to claim 1, wherein the humidity control system (3) includes a humidification module (31). The humidification module (31) includes a water storage tank (311), a main process pipeline (312), a booster pump (313), a humidification flow transmitter (314), a first group of nozzles (315), a second group of nozzles (316) and a third group of nozzles (317). The water storage tank (311) is connected to an external water source. One end of the main process pipeline (312) is connected to the water storage tank (311), and the other end extends upward to the position corresponding to the upper head of the containment of the containment simulator (1). The booster pump (313) and the humidification flow transmitter (314) are arranged on the main process pipeline (312). The first group of nozzles (315) is arranged at the position corresponding to the bottom head of the containment of the containment simulator (1). The second group of nozzles (316) is arranged at the position corresponding to the top of the second compartment of the containment of the containment simulator (1). The third group of nozzles (317) is arranged at the position corresponding to the upper head of the containment of the containment simulator (1). The first group of nozzles (315), the second group of nozzles (316) and the third group of nozzles (317) are all connected to the main process pipeline (312) through branch pipes, and solenoid valves are arranged on both the main process pipeline (312) and the branch pipes; The humidification flow transmitter (314) is electrically connected to the acquisition system (8). A liquid level gauge (318) is provided in the water storage tank (311), and the liquid level gauge (318) is electrically connected to the acquisition system (8).

5. The nuclear power plant containment sealability simulation test system according to claim 4, wherein The humidity control system (3) further includes a dehumidification module (32). The dehumidification module (32) includes a dryer (321), a circulation fan (322), and a circulation pipe (323). Both ends of the circulation pipe (323) extend into the containment simulator (1). The dryer (321) and the circulation fan (322) are both provided on the circulation pipe (323). The circulation fan (322) is used to draw the gas in the containment simulator (1) into the dryer (321) for drying and then send it back into the containment simulator (1). An isolation valve is provided on the circulation pipe (323).

6. The nuclear power plant containment sealability simulation test system according to claim 1, wherein The in-shell positive pressure control module (41) includes a positive pressure PID control unit, a charging pipeline (412), and an emergency air compressor (413), a positive pressure electric control valve (414), a positive pressure flow transmitter (415), a positive pressure pressure transmitter (416), a positive pressure temperature transmitter (417), and a positive pressure humidity transmitter (418) located on the charging pipeline (412). The charging pipeline (412) communicates with the containment simulator (1), and an isolation valve is also provided thereon. The positive pressure flow transmitter (415), the positive pressure pressure transmitter (416), the positive pressure temperature transmitter (417), and the positive pressure humidity transmitter (418) are all electrically connected to the acquisition system (8). The acquisition system (8), the positive pressure PID control unit, and the positive pressure electric control valve (414) are electrically connected in sequence. The positive pressure PID control unit adjusts the opening degree of the positive pressure electric control valve (414) according to the parameters of the gas in the charging pipeline (412) collected by the acquisition system (8) and the gas parameters in the containment simulator (1) so as to maintain the pressure inside the containment simulator (1) at a preset test pressure.

7. The nuclear power plant containment sealability simulation test system according to claim 6, wherein The in-shell negative pressure control module (42) includes a negative pressure PID control unit, a suction pipeline (422), and an exhaust fan (423), a negative pressure electric control valve (424), and a negative pressure flow transmitter (425) located on the suction pipeline (422). The suction pipeline (422) communicates with the containment simulator (1), and an isolation valve is also provided thereon. The negative pressure flow transmitter (425), the acquisition system (8), the negative pressure PID control unit, and the negative pressure electric control valve (424) are electrically connected in sequence. The negative pressure PID control unit adjusts the opening degree of the negative pressure electric control valve (424) according to the parameters of the gas in the suction pipeline (422) collected by the acquisition system (8) and the gas parameters in the containment simulator (1) so as to maintain the pressure inside the containment simulator (1) at a preset test pressure.

8. The containment seal integrity simulation test system for nuclear power plants according to claim 7, characterized in that the pressure control system (4) further includes a pressure guiding pipe network (43), which is located inside the containment simulator (1) and is respectively connected to the charging pipeline (412) and the extraction pipeline (422). It is used to divert the gas in the charging pipeline (412) and flow it into different positions inside the containment simulator (1), or to collect the gas inside the containment simulator (1) and then enter the extraction pipeline (422).

9. The containment seal integrity simulation test system for nuclear power plants according to claim 1, characterized in that the leakage introduction system (5) includes a leakage introduction unit (51) and a plurality of leakage measurement point units (52). The plurality of leakage measurement point units (52) are arranged at different positions of the containment simulator (1). The leakage measurement point unit (52) includes an access pipe (521) and a quick connector (522). One end of the access pipe (521) extends into the containment simulator (1), and the other end is connected to the quick connector (522). An isolation valve is provided on the access pipe (521); the leakage introduction unit (51) includes an introduction PID controller, an introduction pipeline (512), and an introduction electric control valve (513), an introduction flow transmitter (514), an introduction pressure transmitter (515), an introduction temperature transmitter (516), and an introduction humidity transmitter (517) located on the introduction pipeline (512). One end of the introduction pipeline (512) is used to be connected to the corresponding access pipe (521) through the quick connector (522), and the other end is used to be connected to an extraction device or a charging device. The introduction flow transmitter (514), the introduction pressure transmitter (515), the introduction temperature transmitter (516), and the introduction humidity transmitter (517) are all electrically connected to the acquisition system (8). The acquisition system (8), the introduction PID controller, and the introduction electric control valve (513) are electrically connected in sequence. The introduction PID controller adjusts the opening degree of the positive pressure electric control valve (414) according to the parameters of the gas in the introduction pipeline (512) collected by the acquisition system (8), so that the leakage introduction system (5) introduces gas with a set leakage amount into the containment simulator (1).

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