阅读说明：本技术 一种核电厂主控室内漏率测试模拟试验装置及方法 (Nuclear power plant master control room leakage rate test simulation test device and method ) 是由 郑仕建 郭静涛 钟小华 刘文杰 刘勇 楚济如 田齐伟 胡靖� 张彪 林佳 于 2020-04-14 设计创作，主要内容包括：本发明属于核电厂试验技术领域,具体涉及一种核电厂主控室内漏率测试模拟试验装置及方法。包括由内至外依次嵌套设置并能够各自调整气密性的模拟主控室(1)、模拟主控室外罩(2)、试验室(3),还包括为模拟主控室(1)和模拟主控室外罩(2)注入示踪气体和压缩空气的正压与示踪气体注入子系统,以及对模拟主控室(1)和模拟主控室外罩(2)进行气密性试验的仪表子系统和数据采集处理装置(21)。本发明通过对不同测试方法得出的测试结果进行对比分析以确定试验方法的正确性和准确性；还可以通过对正压值进行调整,从而推算出正压值与内漏率之间的关系,为系统和功能的设计者提出合适的正压推荐值。(The invention belongs to the technical field of nuclear power plant tests, and particularly relates to a device and a method for testing and simulating leakage rate in a master control room of a nuclear power plant. The test system comprises a simulation main control room (1), a simulation main control room outer cover (2) and a test room (3), wherein the simulation main control room (1), the simulation main control room outer cover (2) and the test room (3) are sequentially nested from inside to outside and can respectively adjust the air tightness, and the test system also comprises a positive pressure and trace gas injection subsystem for injecting trace gas and compressed air into the simulation main control room (1) and the simulation main control room outer cover (2), and an instrument subsystem and a data acquisition and processing device (21) for performing the air tightness test on the simulation main control room (1) and the simulation. According to the invention, the correctness and the accuracy of the test method are determined by comparing and analyzing the test results obtained by different test methods; the relationship between the positive pressure value and the internal leakage rate can be calculated by adjusting the positive pressure value, and a proper positive pressure recommended value is provided for designers of systems and functions.)

1. The utility model provides a leak rate test analogue test device in nuclear power plant's master control room, characterized by: include from interior to exterior in proper order nested setting and can adjust simulation main control room (1), simulation main control room dustcoat (2), laboratory (3) of gas tightness separately, still include do simulation main control room (1) with the malleation and the tracer gas injection subsystem that tracer gas and compressed air were injected into in simulation main control room dustcoat (2), still include right simulation main control room (1) with simulation main control room dustcoat (2) carry out gas tightness test's instrument subsystem and data acquisition processing apparatus (21).

2. The nuclear power plant master control room internal leakage rate test simulation test device according to claim 1, wherein the simulation master control room (1) is of a cuboid structure, and has the specification: length × width × height ═ 4m × 3m × 1.5 m; the panel is made of a panel material of a transparent hard plate, and the thickness of the panel material is 2 cm; 100 bolt holes (13) are uniformly formed in a top plate of the simulation main control room (1) and used for simulating possible leakage points of the simulation main control room (1).

3. The nuclear power plant master control room leakage rate test simulation test device of claim 2, characterized in that: the diameter of the bolt hole (13) is 2.5cm, the length of the bolt hole is 2cm, the upper half part of the bolt hole (13) is 1cm of threads, and the lower half part of the bolt hole is 1cm of smooth holes.

4. The nuclear power plant master control room indoor leakage rate test simulation test device according to claim 2, wherein the simulation master control room outer cover (2) is of a cuboid structure, and the specification is as follows: length × width × height ═ 6m × 5m × 2.5 m; the simulation master control room is made of the same panel material as the simulation master control room (1), the simulation master control room (1) shares a bottom plate, and the top surface and 4 vertical surfaces of the simulation master control room (1) are 100cm away from the simulation master control room outer cover (2); the thickness of panel material is 2cm, panel material includes organic glass or PC board.

5. The nuclear power plant master control room leakage rate test simulation test device of claim 1, characterized in that: the laboratory (3) is also provided with an environment subsystem for ensuring the constant-temperature and constant-humidity environment of the laboratory (3), and the environment subsystem is an air conditioner (4).

6. The nuclear power plant master control room leakage rate test simulation test device of claim 1, characterized in that: malleation and tracer gas injection subsystem include according to compressed air flow direction through air compressor machine (5), compressed air storage tank (6), stop valve (7), relief pressure valve (8) that the gas circuit pipeline is established ties in proper order and be connected to simulate main control room (1) with gas outlet in the simulation main control room dustcoat (2), still including setting up relief pressure valve (8) with tracer gas constant flow injection device (11) on the gas circuit pipeline between the gas outlet still including measuring manometer (9) and the flowmeter (10) of pressure and flow in the gas circuit pipeline.

7. The nuclear power plant master control room leakage rate test simulation test device of claim 1, characterized in that: the instrument subsystem comprises a pressure sensor (20) and a temperature and humidity sensor (19) which are arranged in the simulation main control room (1), the simulation main control room outer cover (2) and the test room (3) and are used for monitoring the pressure, the temperature and the humidity in the simulation main control room (1), the simulation main control room outer cover (2) and the test room (3); the instrument subsystem is also including setting up simulation main control room (1) with a plurality of tracer gas sensor (12) in simulation main control room dustcoat (2) are used for the monitoring simulation main control room (1) with the tracer gas concentration in simulation main control room dustcoat (2).

8. The nuclear power plant master control room leakage rate test simulation test device of claim 7, characterized in that: the measuring range of the pressure sensor (20) is 0-0.5MPa, the normal value is 0.1MPa, and the signal output is 4-20 mA; the temperature range of the temperature and humidity sensor (19) is 0-100 ℃, and the humidity range is 0-100%; the measuring range of the trace gas sensor (12) is 0-10 ppm.

9. The nuclear power plant master control room leakage rate test simulation test device of claim 7, characterized in that: data acquisition processing apparatus (21) with the instrument subsystem links to each other, is used for the real-time acquisition simulation main control room (1) with simulation main control room dustcoat (2) with the data of the inside pressure, temperature, humidity of laboratory (3), and be used for the real-time acquisition simulation main control room (1) with the tracer gas concentration in the simulation main control room dustcoat (2), and draw the curve according to the data of gathering.

10. The nuclear power plant master control room leakage rate test simulation test device of claim 1, characterized in that: all the reserved holes (17) on the simulation main control room (1), the simulation main control room outer cover (2) and the test room (3) are sealed by silica gel; and an airtight test interface (18) is reserved on the simulation main control room (1) and the simulation main control room outer cover (2) and used for verifying the airtightness of the simulation main control room (1) and the simulation main control room outer cover (2).

11. The simulation test method for the leakage rate test in the nuclear power plant main control room, which is used for the simulation test device for the leakage rate test in the nuclear power plant main control room as claimed in claim 2, comprises the following steps:

step S1, keeping the internal environment of the laboratory (3) at a temperature of 25 ℃ and a humidity of 65%;

step S2, carrying out an airtight test, wherein the airtight test is to keep the air pressure inside the simulation master control room (1) at 2KPa and the air pressure inside the simulation master control room outer cover (2) at 1KPa, and the air pressure is kept for 24 hours;

step S3, after the airtight test is qualified, emptying the pressure inside the simulation main control room (1) and the simulation main control room outer cover (2);

step S4, opening the bolt hole (13) of the top plate of the simulation main control room (1) to ensure that a leakage point exists in the simulation main control room (1);

step S5, injecting compressed air into the simulation master control room (1) to enable the interior of the simulation master control room (1) to generate a positive pressure of 30Pa relative to the simulation master control room outer cover (2);

step S6, testing the internal leakage rate of the simulation main control room (1) by using a constant concentration method, and marking as Q1;

step S7, testing the internal leakage rate of the simulation master control room (1) by using a constant flow injection method, and marking as Q2;

step S8, testing the internal leakage rate of the simulation master control room (1) by using a concentration attenuation method, and marking as Q3;

step S9, comparing the Q1, the Q2 and the Q3, and judging that the test method is correct if the deviation does not exceed 5%; if the deviation exceeds 5%, the reason should be analyzed, and after the problem is found, the step S6, the step S7 and the step S8 are re-executed until the deviation of Q1, Q2 and Q3 does not exceed 5%;

step S10, testing the internal leakage rate of the simulation master control room (1) for 10 times by using the constant concentration method to obtain 10Q 1, wherein the deviation between the Q1 is not more than 5 percent, and the testing method is considered to be accurate; if the deviation exceeds 5%, analyzing the reason, and after searching for a problem, re-executing the step S10 until the deviation of 10Q 1 does not exceed 5%;

step S11, testing the internal leakage rate of the simulation master control room (1) for 10 times by using the constant flow injection method to obtain 10Q 2, and determining that the testing method is accurate if the deviation between the Q2 does not exceed 5%; if the deviation exceeds 5%, analyzing the reason, and after searching for a problem, re-executing the step S11 until the deviation of 10Q 2 does not exceed 5%;

step S12, measuring the internal leakage rate of the simulation master control room (1) for 10 times by using the concentration attenuation method test to obtain 10Q 3, wherein the deviation between the Q3 is not more than 5 percent, and the test method is considered to be accurate; if the deviation exceeds 5%, analyzing the reason, and after searching for a problem, re-executing the step S12 until the deviation of 10Q 3 does not exceed 5%;

step S13, adjusting the positive pressure in the simulation main control room (1) for 10 times, wherein the positive pressure is respectively selected to be 5Pa, 10Pa, 15Pa, 20Pa, 25Pa, 30Pa, 35Pa, 40Pa, 45Pa and 50Pa, and the positive pressure with different pressures obtained by each adjustment is tested through the steps S6 to S12 to obtain the corresponding internal leakage rate, so that the relation between the positive pressure and the internal leakage rate is obtained.

12. The nuclear power plant master control room leakage rate test simulation test method of claim 11, which is characterized in that: in the step S2, after the airtight test is maintained for 24 hours, if the pressure change of the internal air pressure of the simulation main control room (1) and the simulation main control room housing (2) is less than 1%, the airtight test is considered to be qualified, and the next step is performed, otherwise, the airtight test is performed again after checking for leakage.

13. The nuclear power plant master control room leakage rate test simulation test method of claim 11, which is characterized in that: in the step S5, after the positive pressure needs to be stabilized, the next operation is performed; the stable state means that the timing is started after the corresponding positive pressure value is reached, and the fluctuation value of the positive pressure value is not more than 10 percent of the positive pressure value within 10 minutes, and the positive pressure value is considered to be in the stable state; the fluctuation value of the positive pressure value is the maximum positive pressure value minus the minimum positive pressure value in the timing time.

Technical Field

The invention belongs to the technical field of nuclear power plant tests, and particularly relates to a device and a method for testing and simulating leakage rate in a master control room of a nuclear power plant.

Background

After an accident occurs in a nuclear power plant, the master control room must meet the operator habitability condition. To meet this requirement, conventional nuclear power plants have adopted different means to ensure that the primary control room maintains a certain relative positive pressure with respect to the surrounding area, so that the theory is that air can only flow in one direction from the indoor high-pressure side to the outdoor low-pressure side through the pressure boundary of the primary control room. Designers need only be concerned with maintaining a slight positive pressure in the main control room relative to the outside world, without regard to the possibility of reverse infiltration of outdoor air (which may contain airborne radioactive material after a serious accident) into the room.

In the united states nuclear bureau (NRC), about 30% of the pressure boundaries of the master control rooms of the nuclear power plants were taken in the country during 1991 and 2001, and the results of the field test measurement of the internal leakage rate are unexpected, and almost all the measured values of the internal leakage rate of the master control rooms of the nuclear power plants are larger than the assumed values adopted in the design analysis.

Relevant experiments demonstrated that the key assumptions employed for master-room dose analysis were not conservative. The theory of only using micro-positive pressure without measuring the actual internal leak rate cannot meet the main control room habitability requirement. The united states nuclear pipe union (NRC) issued a general letter in 2003 placing test requirements for various nuclear power plants to measure actual leak data in the main control room using tracer gas.

In China, a stricter requirement is provided for the habitability of a nuclear power plant main control room under an accident condition based on a third-generation nuclear power unit AP1000 and Hualong I (HPR1000), but because unfiltered air containing radioactive aerosol directly enters the main control room under the influence of factors such as aging failure of hole plugging materials in a pressure boundary of the main control room, unsmooth airflow organization, local negative pressure and the like under certain or some specific conditions, potential threat exists on the personal health of a main control room operator, and an inner leakage rate test needs to be carried out on the main control room of the nuclear power plant.

Disclosure of Invention

Aiming at the strict requirement of the habitability of the nuclear power plant main control room under the accident condition, the invention aims to develop a whole set of nuclear power plant main control room pressure boundary integrity verification device from an internal leakage rate test to a leakage point search and then to a positive pressure guarantee and design a corresponding verification method.

In order to achieve the purpose, the technical scheme adopted by the invention is that the nuclear power plant master control room indoor leakage rate test simulation test device comprises a simulation master control room, a simulation master control room outer cover and a test room which are sequentially nested from inside to outside and can respectively adjust the air tightness, a positive pressure and trace gas injection subsystem for injecting trace gas and compressed air into the simulation master control room and the simulation master control room outer cover, an instrument subsystem for performing an air tightness test on the simulation master control room and the simulation master control room outer cover, and a data acquisition and processing device.

Further, the simulation master control room is the cuboid structure, and the specification: length × width × height ═ 4m × 3m × 1.5 m; the panel is made of a panel material of a transparent hard plate, and the thickness of the panel material is 2 cm; 100 bolt holes are uniformly formed in the top plate of the simulation main control room and used for simulating possible leakage points of the simulation main control room.

Further, the diameter of the bolt hole is 2.5cm, the length is 2cm, the upper half portion of the bolt hole is 1cm of threads, and the lower half portion of the bolt hole is 1cm of smooth holes.

Further, the simulation master control room dustcoat is the cuboid structure, the specification: length × width × height ═ 6m × 5m × 2.5 m; the simulation main control room is made of the same panel material as the simulation main control room, the simulation main control room and the bottom plate are shared, and the distance between the top surface and 4 vertical surfaces of the simulation main control room and the simulation main control room outer cover is 100 cm; the thickness of panel material is 2cm, panel material includes organic glass or PC board.

Further, the laboratory is also provided with an environment subsystem for ensuring the constant temperature and humidity environment of the laboratory, and the environment subsystem is an air conditioner.

Further, the positive pressure and tracer gas injection subsystem comprises an air compressor, a compressed air storage tank, a stop valve, a pressure reducing valve and a tracer gas constant flow injection device, wherein the air compressor, the compressed air storage tank, the stop valve and the pressure reducing valve are sequentially connected in series through an air pipeline according to the flowing direction of compressed air, the tracer gas constant flow injection device is arranged on the pressure reducing valve and an air pipeline between the air outlets, and the tracer gas constant flow injection device further comprises a pressure gauge and a flow meter for measuring the pressure and the flow in the air pipeline.

Further, the instrument subsystem comprises pressure sensors and temperature and humidity sensors which are arranged in the simulation main control room, the simulation main control room outer cover and the test room and are used for monitoring the pressure, the temperature and the humidity in the simulation main control room, the simulation main control room outer cover and the test room; the instrument subsystem is characterized by also comprising a plurality of trace gas sensors arranged in the simulation main control room and the simulation main control room outer cover and used for monitoring the trace gas concentration in the simulation main control room and the simulation main control room outer cover.

Further, the measuring range of the pressure sensor is 0-0.5MPa, the normal value is 0.1MPa, and the signal output is 4-20 mA; the temperature range of the temperature and humidity sensor is 0-100 ℃, and the humidity range is 0-100%; the range of the trace gas sensor is 0-10 ppm.

Furthermore, the data acquisition and processing device is connected with the instrument subsystem and is used for acquiring the data of pressure, temperature and humidity in the simulation main control room, the simulation main control room outer cover and the test room in real time and acquiring the concentration of tracer gas in the simulation main control room and the simulation main control room outer cover in real time and drawing a curve according to the acquired data.

Furthermore, all reserved holes in the simulation main control room, the simulation main control room outer cover and the test room are sealed by silica gel; and air tightness test interfaces are reserved on the simulation main control room and the simulation main control room outer cover and used for verifying the air tightness of the simulation main control room and the simulation main control room outer cover.

In order to achieve the purpose, the invention also discloses a simulation test method for testing the leakage rate in the nuclear power plant master control room, which is used for the simulation test device for testing the leakage rate in the nuclear power plant master control room, and the simulation test method comprises the following steps:

step S1, keeping the internal environment of the laboratory at 25 ℃ and 65% humidity;

step S2, carrying out an airtight test, wherein the airtight test is to keep the air pressure inside the simulation master control room at 2KPa and the air pressure inside the simulation master control room outer cover at 1KPa for 24 hours;

step S3, after the airtight test is qualified, the pressure inside the simulation main control room and the simulation main control room outer cover is released;

step S4, the bolt hole of the top plate of the simulation main control room is opened to ensure that a leakage point exists in the simulation main control room;

step S5, injecting compressed air into the simulation master control room to enable the interior of the simulation master control room to generate a positive pressure of 30Pa relative to the outer cover of the simulation master control room;

step S6, testing the internal leakage rate of the simulation master control room by using a constant concentration method, and marking as Q1;

step S7, testing the internal leakage rate of the simulation master control room by using a constant flow injection method, and marking as Q2;

step S8, testing the internal leakage rate of the simulation master control room by using a concentration attenuation method, and marking as Q3;

step S9, comparing the Q1, the Q2 and the Q3, and judging that the test method is correct if the deviation does not exceed 5%; if the deviation exceeds 5%, analyzing the reason, and after searching for a problem, re-executing the step S6, the step S7 and the step S8 until the deviation of Q1, Q2 and Q3 does not exceed 5%;

step S10, testing the internal leakage rate of the simulation master control room for 10 times by using the constant concentration method to obtain 10Q 1, and judging that the testing method is accurate if the deviation between the Q1 does not exceed 5%; if the deviation exceeds 5%, analyzing the reason, and after searching for a problem, re-executing the step S10 until the deviation of 10Q 1 does not exceed 5%;

step S11, the constant flow injection method is used for testing the internal leakage rate of the simulation master control room for 10 times to obtain 10Q 2, and the deviation between the Q2 is not more than 5%, so that the testing method is considered to be accurate; if the deviation exceeds 5%, analyzing the reason, and after searching for a problem, re-executing the step S11 until the deviation of 10Q 2 does not exceed 5%;

step S12, measuring the internal leakage rate of the simulation master control room for 10 times by using the concentration attenuation method test to obtain 10Q 3, wherein the deviation between the Q3 is not more than 5 percent, and the test method is considered to be accurate; if the deviation exceeds 5%, analyzing the reason, and after searching for a problem, re-executing the step S12 until the deviation of 10Q 3 does not exceed 5%;

step S13, adjusting the positive pressure in the simulation master control chamber for 10 times, wherein the positive pressure is respectively selected to be 5Pa, 10Pa, 15Pa, 20Pa, 25Pa, 30Pa, 35Pa, 40Pa, 45Pa and 50Pa, and the positive pressure of different pressures obtained by each adjustment is tested through the steps S6 to S12 to obtain the corresponding internal leakage rate, so that the relation between the positive pressure and the internal leakage rate is obtained.

Further, in the step S2, after the airtight test is maintained for 24 hours, if the pressure change of the internal air pressures of the simulation main control room and the simulation main control room outer cover is less than 1%, the airtight test is considered to be qualified, and the next step is performed, otherwise, the airtight test is performed again after the leakage is detected.

Further, in the step S5, after the positive pressure needs to be stabilized, the next operation is performed; the stable state means that the timing is started after the corresponding positive pressure value is reached, and the fluctuation value of the positive pressure value is not more than 10 percent of the positive pressure value within 10 minutes, and the positive pressure value is considered to be in the stable state; the fluctuation value of the positive pressure value is the maximum positive pressure value minus the minimum positive pressure value in the timing time.

The invention has the beneficial effects that:

1. the invention can respectively adopt a constant flow method, a constant concentration method and a concentration attenuation method to carry out the internal leakage rate test, and the correctness and the accuracy of the test method are determined by comparing test results obtained by different test methods.

2. The invention can find out the relation between the positive pressure value and the internal leakage rate by adjusting the positive pressure value, and can provide a proper positive pressure recommended value for a designer.

Drawings

Fig. 1 is a schematic diagram of a simulation test device for testing leakage rate in a nuclear power plant main control room according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a simulation master control room 1, a simulation master control room enclosure 2, and a laboratory 3 according to an embodiment of the present invention;

fig. 3 is a bottom view of a simulation main control room 1 and a simulation main control room outer cover 2 according to an embodiment of the present invention;

fig. 4 is a front view of the simulation main control room 1 according to the embodiment of the present invention;

fig. 5 is a right side view of the simulation main control room 1 according to the embodiment of the present invention;

fig. 6 is a top view of the simulation main control room 1 according to the embodiment of the present invention;

FIG. 7 is a front view of a simulated master control room enclosure 2 according to an embodiment of the present invention;

FIG. 8 is a right side view of the simulated master control room enclosure 2 according to the embodiment of the invention;

FIG. 9 is a top view of a simulated master control room enclosure 2 according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a connection relationship between an instrument subsystem and a data acquisition and processing device 21 and an information display unit 22 according to an embodiment of the present invention (the instrument subsystem in the diagram includes 1 temperature and humidity sensor 19, 1 pressure sensor 20, and 4 trace gas sensors 12 disposed on a simulation main control room 1, and 1 temperature and humidity sensor 19, 1 pressure sensor 20, and 4 trace gas sensors 12 disposed on a simulation main control room outer cover 2);

in the figure: 1-simulation master control room, 2-simulation master control room outer cover, 3-test room, 4-air conditioner, 5-air compressor, 6-compressed air storage tank, 7-stop valve, 8-pressure reducing valve, 9-pressure gauge, 10-flow meter, 11-trace gas constant flow injection device, 12-trace gas sensor, 13-bolt hole, 14-drain valve, 15-safety valve, 16-data acquisition and processing device, 17-reserved hole, 18-airtight test interface, 19-temperature and humidity sensor, 20-pressure sensor, 21-data acquisition and processing device, 22-information display unit, 23-printer.

Detailed Description

The invention is further described below with reference to the figures and examples.

As shown in fig. 1 and 2, the simulation test device for testing the leakage rate in the nuclear power plant main control room provided by the invention comprises a simulation main control room 1, a simulation main control room outer cover 2, a test room 3, a positive pressure and trace gas injection subsystem, an environment subsystem, an instrument subsystem, a data acquisition and processing device 21 and the like. The simulation main control room 1, the simulation main control room outer cover 2 and the test room 3 are sequentially nested from inside to outside, and the air tightness of the simulation main control room 1, the simulation main control room outer cover 2 and the test room 3 can be adjusted respectively. The positive pressure and trace gas injection subsystem is used for injecting trace gas and compressed air into the simulation main control room 1 and the simulation main control room outer cover 2. The instrument subsystem and the data acquisition and processing device 21 are used for carrying out air tightness tests on the simulation main control room 1 and the simulation main control room outer cover 2.

As shown in fig. 1, 2 and 3, the simulation master control room 1 has a rectangular parallelepiped structure and has the following specifications: length × width × height ═ 4m × 3m × 1.5 m; the panel is made of a panel material of a transparent hard plate, and the thickness of the panel material is 2 cm; 100 bolt holes 13 are uniformly formed in the top plate of the simulation master control chamber 1 and used for simulating possible leakage points on the simulation master control chamber 1.

The diameter of the bolt hole 13 is 2.5cm, the length is 2cm, the upper half part of the bolt hole 13 is 1cm of threads, and the lower half part is 1cm of smooth holes.

As shown in fig. 1, 2 and 3, the simulation master control room housing 2 has a rectangular parallelepiped structure, and has the following specifications: length × width × height ═ 6m × 5m × 2.5 m; the simulation master control room is made of the same panel material as that of the simulation master control room 1, the simulation master control room 1 and the bottom plate are shared, and the distance between the top surface and 4 vertical surfaces of the simulation master control room 1 and the simulation master control room outer cover 2 is 100 cm; the panel material comprises organic glass or a PC plate, and the thickness of the panel material is 2 cm.

The environment subsystem is arranged in the test room 3 and used for guaranteeing the constant-temperature and constant-humidity environment in the test room 3, the environment subsystem is an air conditioner 4, the constant-temperature and constant-humidity environment in the test room 3 is achieved through a plurality of air conditioners 4, and the influence of environment change on test results is reduced to the minimum.

As shown in fig. 1, the positive pressure and trace gas injection subsystem comprises an air compressor 5, a compressed air storage tank 6, a stop valve 7, a pressure reducing valve 8 and a gas outlet connected to the simulation main control chamber 1 and the simulation main control chamber outer cover 2 which are sequentially connected in series through a gas pipeline according to the flowing direction of compressed air, a trace gas constant flow injection device 11 arranged on the gas pipeline between the pressure reducing valve 8 and the gas outlet, and a pressure gauge 9 and a flow meter 10 for measuring the pressure and the flow in the gas pipeline.

As shown in fig. 1, the instrument subsystem includes a pressure sensor 20 and a temperature and humidity sensor 19 which are arranged in the simulation main control room 1, the simulation main control room outer cover 2 and the test room 3 and are used for monitoring the pressure, the temperature and the humidity inside the simulation main control room 1, the simulation main control room outer cover 2 and the test room 3; the instrument subsystem further comprises a plurality of tracer gas sensors 12 arranged in the simulation main control room 1 and the simulation main control room outer cover 2 and used for monitoring the concentration of tracer gas in the simulation main control room 1 and the simulation main control room outer cover 2.

The measuring range of the pressure sensor 20 is 0-0.5MPa, the normal value is 0.1MPa, and the signal output is 4-20 mA; the temperature range of the temperature and humidity sensor 19 is 0-100 ℃, and the humidity range is 0-100%; the range of the trace gas sensor 12 is 0-10 ppm.

As shown in fig. 10, the data acquisition and processing device 21 is connected to the instrument subsystem and is connected to an information display unit 22 (the information display unit 22 is a computer) with a printer 23, and is used for acquiring data of pressure, temperature and humidity inside the simulation main control room 1, the simulation main control room housing 2 and the test room 3 in real time, acquiring concentrations of trace gases inside the simulation main control room 1 and the simulation main control room housing 2 in real time, and drawing a curve according to the acquired data, so as to accurately judge the equilibrium concentration of the trace gases.

As shown in fig. 4 to 9, all the reserved holes 17 on the simulation main control room 1, the simulation main control room outer cover 2 and the test room 3 are sealed by silica gel (the reserved holes 17 are used for installing instruments and cables), and airtight test interfaces 18 are reserved on the simulation main control room 1 and the simulation main control room outer cover 2 and used for verifying the airtightness of the simulation main control room 1 and the simulation main control room outer cover 2 after the test device is built.

The invention also discloses a simulation test method for testing the leakage rate in the master control room of the nuclear power plant, which is used for the simulation test device for testing the leakage rate in the master control room of the nuclear power plant, and comprises the following steps:

step S1, keeping the internal environment of the laboratory 3 at 25 ℃ and 65% humidity, and using the smooth curves of the air pressure, temperature and humidity of the laboratory 3 collected by the data collection processing device 21 as the judgment standard; (including assembling the test device and securing, seating and sealing all meters, and powering all remote meters to ensure that all remote data can be transmitted to the data collection and processing subsystem before step S1.)

Step S2, performing an air tightness test, wherein the air tightness test refers to connecting a compressed air inlet of the air compressor 5 with the air tightness test interfaces 18 of the simulation main control room 1 and the simulation main control room outer cover 2, filling proper pressure into the simulation main control room 1 and the simulation main control room outer cover 2, keeping the air pressure inside the simulation main control room 1 at 2KPa, keeping the air pressure inside the simulation main control room outer cover 2 at 1KPa, and keeping the air pressure for 24 hours; after the airtight test is kept for 24 hours, if the pressure change of the internal air pressure of the simulation main control room 1 and the simulation main control room outer cover 2 is lower than 1%, the airtight test is qualified, and the next step (step S3) is carried out, otherwise, the airtight test is carried out again after the leakage of the simulation main control room 1 and the simulation main control room outer cover 2 is checked;

step S3, after the airtight test is qualified, the pressure inside the simulation main control room 1 and the simulation main control room outer cover 2 is released;

step S4, an operator enters the simulation main control room 1 through a manhole on the simulation main control room 1, and appropriately opens the bolt hole 13 of the top plate of the simulation main control room 1 to ensure that a leakage point exists in the simulation main control room 1; the operator exits the simulation master control room 1;

step S5, injecting compressed air into the simulation main control room 1 through the air tightness test interface 18 of the simulation main control room 1, so that a positive pressure of 30Pa is generated inside the simulation main control room 1 with respect to the simulation main control room housing 2 (that is, the air pressure of the simulation main control room 1 — the air pressure of the simulation main control room housing 2 is 30 Pa); in step S5, the next operation (step S6) is performed after the positive pressure is stabilized; the stability means that the timing is started after the corresponding positive pressure value is reached, and within 10 minutes, the fluctuation value of the positive pressure value does not exceed 10 percent of the positive pressure value and is considered to be in a stable state; the fluctuation value of the positive pressure value is obtained by subtracting the minimum positive pressure value from the maximum positive pressure value within the timing time;

step S6, testing the internal leakage rate of the simulation main control room 1 by using a constant concentration method, and marking as Q1;

step S7, testing the internal leakage rate of the simulation master control room 1 by using a constant flow injection method, and marking as Q2;

step S8, testing the internal leakage rate of the simulation master control room 1 by using a concentration attenuation method, and marking as Q3;

step S9, comparing Q1 with Q2 and Q3, and judging that the test method is correct if the deviation does not exceed 5%; if the deviation exceeds 5%, the reason is analyzed, and after the problem is found, the step S6, the step S7 and the step S8 are executed again until the deviation of Q1, Q2 and Q3 does not exceed 5%;

step S10, testing the internal leakage rate of the simulation master control room 1 for 10 times by using a constant concentration method to obtain 10Q 1, and judging that the testing method is accurate if the deviation among Q1 is not more than 5%; if the deviation exceeds 5%, the reason should be analyzed, and after the problem is found, the step S10 is executed again until the deviation of 10Q 1 does not exceed 5%;

step S11, testing the internal leakage rate of the simulation master control room 1 for 10 times by using a constant flow injection method to obtain 10Q 2, and judging that the testing method is accurate if the deviation among Q2 is not more than 5%; if the deviation exceeds 5%, the reason should be analyzed, and after the problem is found, the step S11 is executed again until the deviation of 10Q 2 does not exceed 5%;

step S12, measuring the internal leakage rate of the simulation master control room 1 for 10 times by using a concentration attenuation method test to obtain 10Q 3, wherein the deviation between Q3 is not more than 5 percent, and the test method is considered to be accurate; if the deviation exceeds 5%, the reason should be analyzed, and after the problem is found, the step S12 is executed again until the deviation of 10Q 3 does not exceed 5%;

step S13, the positive pressure in the simulation main control chamber 1 is adjusted for 10 times through the positive pressure and tracer gas injection subsystem, the positive pressure is respectively selected to be 5Pa, 10Pa, 15Pa, 20Pa, 25Pa, 30Pa, 35Pa, 40Pa, 45Pa and 50Pa, the positive pressure with different pressures obtained by each adjustment is tested through the steps S6 to S12 to obtain the corresponding internal leakage rate, and therefore the relation between the positive pressure and the internal leakage rate is obtained.

And step S14, ending the test and restoring the system.

The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.