Multifunctional test bench and test method for researching performance of primary loop voltage stabilizer of reactor

Abstract

The invention provides a multifunctional test bench for researching the performance of a primary loop voltage stabilizer of a reactor and a test method. The test bed is mainly composed of a water supplementing system, a main loop system, a steam and inert gas pressure stabilizing system and a drainage system. The test bench can be used for simulating the cold-state starting process of a primary loop of a traditional reactor, starting characteristics of the loop when a steam pressure stabilizer and an inert gas pressure stabilizer serve as the loop are obtained respectively, and a basis is provided for performance evaluation of different pressure stabilizers.

Description

Technical Field

[0001] This invention relates to the field of reactor thermal-hydraulic technology, and in particular to a multifunctional test rig and test method for studying the performance of a reactor primary circuit pressurizer. It relates to the steam and inert gas pressurization system of a nuclear power plant, specifically to a test apparatus for studying the steam and inert gas pressurization of a nuclear reactor. Background Technology

[0002] In the primary loop system of a pressurized water reactor, the pressurizer, as the core equipment for maintaining system pressure stability, ensures the safe operation of the reactor by absorbing volume fluctuations caused by changes in coolant temperature and suppressing pressure transients.

[0003] Currently, there are two main technical approaches in engineering applications: steam pressure regulators and inert gas pressure regulators. Steam pressure regulators use electric heaters to maintain a saturated steam chamber and achieve pressure regulation based on the gas-liquid two-phase balance. Inert gas pressure regulators use inert gases such as nitrogen as pressure compensation media and rely on the compressibility of the gas to absorb pressure fluctuations.

[0004] Existing research methods mostly focus on isolated bench tests of single types of pressurizers, and in particular, lack a comprehensive experimental platform capable of evaluating two types of pressurizers under the same comparable conditions. This results in reactor designers lacking direct and reliable experimental basis when selecting pressurizers. Therefore, there is a need to develop a multifunctional test bench and testing method that can simulate the main thermal-hydraulic processes of the primary loop. Through precise control and measurement, under identical boundary conditions and disturbance conditions, it can test key performance parameters such as pressure control, dynamic response time, and stability margin of both pressurizers, thereby providing solid experimental data and support for the scientific selection of pressurizers in different application scenarios. Summary of the Invention

[0005] The purpose of this invention is to address the problems in the existing technology by proposing a multifunctional test bench and test method for studying the performance of the primary loop pressurizer in a traditional pressurized water reactor nuclear power plant during startup. The test bench is an experimental device used to study the influence of an inert gas pressurizer or steam pressurizer on the temperature and pressure within the system during the cold start-up process of a nuclear reactor.

[0006] This invention is achieved through the following technical solution: This invention proposes a multifunctional test bench for studying the performance of a reactor primary loop pressurizer. The multifunctional test bench includes a water supply system, a main loop system, a steam and inert gas pressurization system, and a drainage system; the drainage system, the steam and inert gas pressurization system, the main loop system, and the water supply system are connected in sequence. The water replenishment system consists of a water tank, a water replenishment pump, a flow meter, a resin deaerator, connecting pipes, and valves. The main loop system consists of a pressure vessel simulator, a main pump, a flow meter, connecting pipes, and valves. The steam and inert gas pressure stabilization system consists of a steam pressure regulator simulator, an inert gas pressure regulator simulator, a charging pump, connecting pipes, and valves. The drainage system consists of a drainage tank, a heat exchanger, a flow meter, connecting pipes, and valves.

[0007] Furthermore, the water tank is equipped with an electric heater and an insulation layer; the connecting pipe is equipped with an electric heater and an insulation layer; and the steam pressure regulator simulator is equipped with an electric heater and an insulation layer.

[0008] Furthermore, the pressure vessel simulator is equipped with an exhaust valve and a safety valve at the top, and is connected to a drainage system at the bottom via a connecting pipe; the pressure vessel simulator is equipped with an insulation layer; and the pressure vessel simulator is equipped with temperature measuring points and pressure measuring points.

[0009] Furthermore, the top of the steam pressure regulator simulator is equipped with an exhaust valve and a safety valve; the top of the steam pressure regulator simulator is equipped with a pressure measuring point, and temperature measuring points are distributed at different locations from top to bottom; the bottom of the steam pressure regulator simulator is connected to the main circuit system.

[0010] Furthermore, the inert gas pressure regulator simulator is equipped with an exhaust valve, an inflation valve, and a safety valve at the top. The inflation valve is connected to a high-pressure inert gas storage bottle via a connecting pipe. The valve connecting the inert gas pressure regulator simulator to the high-pressure inert gas storage bottle and the top exhaust valve are controlled by a control system, which can adjust the pressure inside the inert gas pressure regulator simulator. The bottom of the inert gas pressure regulator simulator is connected to a drainage system. The inert gas pressure regulator simulator is equipped with pressure measuring points and temperature measuring points distributed at different locations from top to bottom.

[0011] Furthermore, the drainage tank is connected to the main circuit system and the inert gas pressure regulator simulator, respectively, and the drainage position is controlled by adjusting the opening and closing of the valve.

[0012] Furthermore, the drain tank is equipped with a drain valve at the bottom and a vent valve controlled by the control system at the top, which connects a high-pressure inert gas storage bottle and an exhaust valve controlled by the control system. The pressure in the drain tank is adjusted by the control system.

[0013] The present invention also proposes a test method based on the multifunctional test bench for studying the performance of the reactor primary circuit pressurizer, wherein the method specifically involves heating the water in the water tank to a specified temperature using an electric heater in the water tank, and then turning off the electric heater; Open the top vent valve of each simulator, open the resin deaerator connection loop to deoxygenate the water entering the system, start the water replenishment pump, open the water replenishment valve in the system to replenish the system with water, and after the water is filled into each simulator, close the top vent valve in sequence; after the loop is filled with water, turn off the water replenishment pump. The back pressure of the drain tank is set by the control system, which then controls the replenishment of air into the drain tank to increase pressure or the exhaust of air to decrease pressure.

[0014] Furthermore, when conducting the test using the steam pressure regulator simulator, close the valve connecting the inert gas pressure regulator simulator to the circuit; turn on the main pump to allow the water in the circuit to start flowing; turn on the electric heater in the main circuit and the electric heater in the steam pressure regulator simulator to an appropriate power so that the water in the circuit heats up at a specified rate; and control whether the heating rate in the circuit and the steam pressure regulator simulator are the same by adjusting the power of the electric heater and the opening and closing of the charging pump. When the specified pressure is reached in the circuit, the connecting valve between the circuit and the drain tank is opened to drain the water. The valve opening can be adjusted according to the drainage speed requirements. After the pressure is reduced to the specified pressure, the connecting valve is closed to end the drainage. After the steam pressure regulator simulator reaches the specified temperature, the electric heater in the main circuit is turned off, while the electric heater inside the steam pressure regulator remains on. The system drain valve is opened, and steam is generated inside the steam pressure regulator simulator, and the steam chamber begins to form. At this time, the drain is opened. By adjusting the switch of the electric heater, the temperature is controlled to be maintained above the saturation temperature, and the pressure is maintained near the pressure corresponding to the saturation temperature, until the specified liquid level is reached in the steam pressure regulator simulator. The steam chamber is then established, and the startup process is complete.

[0015] Furthermore, when conducting the test using an inert gas pressure regulator simulator, close the valve connecting the vapor pressure regulator simulator to the circuit, open the inert gas pressure regulator simulator's inflation valve, pressurize the system using a high-pressure inert gas storage bottle, adjust the back pressure of the pressure relief valve to the specified pressure through the control system, open the system drain valve connecting the inert gas pressure regulator simulator to the drain tank, drain water and pressurize the inert gas pressure regulator simulator, and close the system drain valve when the water level in the inert gas pressure regulator simulator reaches the specified level, thus ending the inflation and pressurization process. Turn on the main pump to start the water flow in the circuit; turn on the electric heater in the main circuit to the appropriate power so that the water in the circuit heats up at the specified rate. When the specified pressure is reached in the circuit, open the connecting valve between the inert gas regulator simulator and the circuit or the connecting valve between the circuit and the drain tank to drain the water. After the pressure is reduced to the specified pressure, close the connecting valve to end the drainage. After the water in the circuit and pressure vessel simulator is heated to the specified temperature, the electric heater in the main circuit is turned off, completing the startup process.

[0016] The beneficial effects of this invention are: 1. By simultaneously installing a steam pressurizer and an inert gas pressurizer in the loop, experimental research can be conducted on the working performance of the steam pressurizer and the inert gas pressurizer during the cold start-up of the reactor in the same test device; 2. The system operating parameters of steam pressure regulator and inert gas pressure regulator can be compared and analyzed when they are put into use under the same start-up conditions, and the performance of steam pressure regulator and inert gas pressure regulator under the same conditions can be evaluated respectively. 3. By independently adjusting the power of the electric heaters installed in various parts of the system, the heating rate of different areas in the system can be controlled, thereby simulating complex thermal-hydraulic conditions. 4. The inert gas regulator can be filled and pressurized by a high-pressure inert gas storage bottle whose valve is controlled by the control system. The amount of inert gas filled and the required system pressure can be flexibly controlled. 5. The performance of the voltage regulator under different starting conditions can be analyzed and studied within the same test bench; 6. Sampling points are arranged in various parts of the system to monitor and analyze the migration patterns of non-condensable gases in the loop under different operating conditions and at different times, as well as their potential impact on system pressure control and heat transfer characteristics. 7. The pressure relief pipe is equipped with a cooling heat exchanger and valves to prevent the high-temperature fluid from vaporizing instantly. It can achieve accurate measurement and control of the discharge flow rate, and then compare and analyze the impact of different drainage rates. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the multifunctional test bench used in this invention to study the performance of the reactor primary loop pressurizer.

[0019] Explanation of markings in the diagram: 1—Pressure vessel simulator; 2—Steam pressure regulator simulator; 3—Inert gas pressure regulator simulator; 4—Drain tank; 5, 6, 7, 8—Flow meters; 9—Water tank; 10, 11, 12—Electric heaters; 13—Main pump; 14—Make-up water pump; 15—Charging pump; 16—Heat exchanger; 17—High-pressure inert gas storage bottle; 18—Resin deaerator; 19, 20—Level gauges; 21, 22, 23, 24, 25—Sampling points. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention proposes a multifunctional test bench for studying the performance of reactor primary loop pressurizers. It mainly consists of a makeup water system, a main loop system, a steam and inert gas pressurization system, and a drainage system. The test bench described in this invention can be used to simulate the cold start-up process of a conventional reactor primary loop, obtaining the start-up characteristics of steam pressurizers and inert gas pressurizers as the primary loop, respectively, providing a basis for evaluating the performance of different pressurizers.

[0022] Specifically, in combination Figure 1 This invention proposes a multifunctional test bench for studying the performance of a reactor primary circuit pressurizer. The multifunctional test bench includes a water supply system, a main circuit system, a steam and inert gas pressurization system, and a drainage system; the drainage system, the steam and inert gas pressurization system, the main circuit system, and the water supply system are connected in sequence. The water replenishment system consists of a water tank, a water replenishment pump, a flow meter, a resin deaerator, connecting pipes, and valves. The main loop system consists of a pressure vessel simulator, a main pump, a flow meter, connecting pipes, and valves. The steam and inert gas pressure stabilization system consists of a steam pressure regulator simulator, an inert gas pressure regulator simulator, a charging pump, connecting pipes, and valves. The drainage system consists of a drainage tank, a heat exchanger, a flow meter, connecting pipes, and valves.

[0023] Furthermore, the water tank is equipped with an electric heater and an insulation layer; the connecting pipe is equipped with an electric heater and an insulation layer; and the steam pressure regulator simulator is equipped with an electric heater and an insulation layer.

[0024] Furthermore, the pressure vessel simulator is equipped with an exhaust valve and a safety valve at the top, and is connected to a drainage system at the bottom via a connecting pipe; the pressure vessel simulator is equipped with an insulation layer; and the pressure vessel simulator is equipped with temperature measuring points and pressure measuring points.

[0025] Furthermore, the top of the steam pressure regulator simulator is equipped with an exhaust valve and a safety valve; the top of the steam pressure regulator simulator is equipped with a pressure measuring point, and temperature measuring points are distributed at different locations from top to bottom; the bottom of the steam pressure regulator simulator is connected to the main circuit system.

[0026] Furthermore, the inert gas pressure regulator simulator is equipped with an exhaust valve, an inflation valve, and a safety valve at the top. The inflation valve is connected to a high-pressure inert gas storage bottle via a connecting pipe. The valve connecting the inert gas pressure regulator simulator to the high-pressure inert gas storage bottle and the top exhaust valve are controlled by a control system, which can adjust the pressure inside the inert gas pressure regulator simulator. The bottom of the inert gas pressure regulator simulator is connected to a drainage system. The inert gas pressure regulator simulator is equipped with pressure measuring points and temperature measuring points distributed at different locations from top to bottom.

[0027] Furthermore, the drainage tank is connected to the main circuit system and the inert gas pressure regulator simulator, respectively, and the drainage position is controlled by adjusting the opening and closing of the valve.

[0028] Furthermore, the drain tank is equipped with a drain valve at the bottom and a vent valve controlled by the control system at the top, which connects a high-pressure inert gas storage bottle and an exhaust valve controlled by the control system. The pressure in the drain tank is adjusted by the control system.

[0029] In addition to the temperature and pressure measuring points in each container, the test rig also includes sampling points arranged in the inert gas pressure regulator simulator, the pressure vessel simulator, and various parts of the loop for studying the migration characteristics of the inert gas. Furthermore, in addition to the temperature and pressure measuring points in each container, the test rig also includes temperature measuring points and strain gauges arranged in the waveguide connecting the steam pressure regulator simulator, the inert gas pressure regulator simulator, and the pressure vessel simulator to the loop for studying the lifespan of the waveguide.

[0030] The present invention also proposes a test method based on the multifunctional test bench for studying the performance of the reactor primary circuit pressurizer, wherein the method specifically involves heating the water in the water tank to a specified temperature using an electric heater in the water tank, and then turning off the electric heater; Open the top vent valve of each simulator, open the resin deaerator connection loop to deoxygenate the water entering the system, start the water replenishment pump, open the water replenishment valve in the system to replenish the system with water, and after the water is filled into each simulator, close the top vent valve in sequence; after the loop is filled with water, turn off the water replenishment pump. The back pressure of the drain tank is set by the control system, which then controls the replenishment of air into the drain tank to increase pressure or the exhaust of air to decrease pressure.

[0031] Furthermore, when conducting the test using the steam pressure regulator simulator, close the valve connecting the inert gas pressure regulator simulator to the circuit; turn on the main pump to allow the water in the circuit to start flowing; turn on the electric heater in the main circuit and the electric heater in the steam pressure regulator simulator to an appropriate power so that the water in the circuit heats up at a specified rate; and control whether the heating rate in the circuit and the steam pressure regulator simulator are the same by adjusting the power of the electric heater and the opening and closing of the charging pump. When the specified pressure is reached in the circuit, the connecting valve between the circuit and the drain tank is opened to drain the water. The valve opening can be adjusted according to the drainage speed requirements. After the pressure is reduced to the specified pressure, the connecting valve is closed to end the drainage. After the steam pressure regulator simulator reaches the specified temperature, the electric heater in the main circuit is turned off, while the electric heater inside the steam pressure regulator remains on. The system drain valve is opened, and steam is generated inside the steam pressure regulator simulator, and the steam chamber begins to form. At this time, the drain is opened. By adjusting the switch of the electric heater, the temperature is controlled to be maintained above the saturation temperature, and the pressure is maintained near the pressure corresponding to the saturation temperature, until the specified liquid level is reached in the steam pressure regulator simulator. The steam chamber is then established, and the startup process is complete.

[0032] Furthermore, when conducting the test using an inert gas pressure regulator simulator, close the valve connecting the vapor pressure regulator simulator to the circuit, open the inert gas pressure regulator simulator's inflation valve, pressurize the system using a high-pressure inert gas storage bottle, adjust the back pressure of the pressure relief valve to the specified pressure through the control system, open the system drain valve connecting the inert gas pressure regulator simulator to the drain tank, drain water and pressurize the inert gas pressure regulator simulator, and close the system drain valve when the water level in the inert gas pressure regulator simulator reaches the specified level, thus ending the inflation and pressurization process. Turn on the main pump to start the water flow in the circuit; turn on the electric heater in the main circuit to the appropriate power so that the water in the circuit heats up at the specified rate. When the specified pressure is reached in the circuit, open the connecting valve between the inert gas regulator simulator and the circuit or the connecting valve between the circuit and the drain tank to drain the water. After the pressure is reduced to the specified pressure, close the connecting valve to end the drainage. After the water in the circuit and pressure vessel simulator is heated to the specified temperature, the electric heater in the main circuit is turned off, completing the startup process.

[0033] Example To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments will be described below in conjunction with the accompanying drawings.

[0034] This invention proposes a multifunctional test bench for studying the performance of reactor primary loop pressurizers. A schematic diagram of the overall system is shown below. Figure 1 As shown. After the water in the water tank 9 is heated to the specified temperature by the electric heater 10 in the water tank 9, the electric heater 10 is then turned off.

[0035] Open the top vent valves of each simulator, open the resin deaerator 18 to connect the loop and deaerate the water entering the system, start the water replenishment pump 14, open the water replenishment valve in the system to replenish water, and after water is injected into each simulator, close the top vent valves in sequence. After the loop is full of water, turn off the water replenishment pump 14.

[0036] The back pressure of the drain tank is set by the control system, which then controls the replenishment of air into the drain tank to increase pressure or the exhaust of air to decrease pressure.

[0037] When conducting tests using a steam pressure regulator, close the valve connecting the inert gas pressure regulator to the circuit. Turn on the main pump 13 to begin water flow in the circuit. Turn on the electric heater 11 in the main circuit and the electric heater 12 inside the steam pressure regulator simulator to an appropriate power to raise the temperature of the water in the circuit at a specified rate. The heating rate in the circuit and inside the steam pressure regulator simulator can be controlled by adjusting the power of the electric heaters and the opening and closing of the charging pump to ensure they are the same.

[0038] When the specified pressure is reached in the circuit, the connecting valve between the circuit and the drain tank is opened to drain the water. The valve opening can be adjusted according to the required drainage speed. After the pressure is reduced to the specified level, the connecting valve is closed to end the drainage.

[0039] After the steam pressure regulator simulator reaches the specified temperature, the electric heater 11 in the main circuit is turned off, while the electric heater 12 inside the steam pressure regulator remains on. The system drain valve is opened, and steam is generated inside the steam pressure regulator, and the steam chamber begins to form. At this time, the drain is opened. By adjusting the switch of the electric heater, the temperature is controlled to be maintained above the saturation temperature, and the pressure is maintained near the pressure corresponding to the saturation temperature, until the specified liquid level is reached in the steam pressure regulator simulator. The steam chamber is then established, and the startup process is complete.

[0040] When using an inert gas pressure regulator for testing, close the valve connecting the steam pressure regulator to the circuit, open the inert gas pressure regulator charging valve, pressurize the system using a high-pressure inert gas storage bottle, adjust the back pressure of the pressure relief valve to the specified pressure through the control system, open the system drain valve connecting the inert gas pressure regulator to the drain tank, drain and pressurize the inert gas pressure regulator, and close the system drain valve when the water level in the inert gas pressure regulator reaches the specified level, thus ending the charging and pressurization process.

[0041] Turn on the main pump 13 to start the water flow in the circuit. Turn on the electric heater 11 in the main circuit to an appropriate power to heat the water in the circuit at a specified rate.

[0042] When the specified pressure is reached in the circuit, open the connecting valve between the inert gas regulator and the circuit or the connecting valve between the circuit and the drain tank to drain the water. After the pressure is reduced to the specified pressure, close the connecting valve to end the drainage.

[0043] After the water in the circuit and pressure vessel simulator is heated to the specified temperature, the electric heater 11 in the main circuit is turned off, completing the startup process.

[0044] In addition, when using an inert gas regulator for testing, multiple start-up-cooling cycles can be performed, and samples can be taken between cycles through sampling points set in the inert gas regulator and pressure vessel simulator to study the migration characteristics of the inert gas.

[0045] The foregoing has provided a detailed description of a multifunctional test bench and test method for studying the performance of a reactor primary circuit pressurizer. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the invention. Therefore, the content of this specification should not be construed as a limitation of the invention.

Claims

1. A multifunctional test rig for studying the performance of a reactor primary circuit pressurizer, characterized in that, The multifunctional test bench includes a water supply system, a main circuit system, a steam and inert gas pressure stabilization system, and a drainage system; the drainage system, the steam and inert gas pressure stabilization system, the main circuit system, and the water supply system are connected in sequence. The water replenishment system consists of a water tank, a water replenishment pump, a flow meter, a resin deaerator, connecting pipes, and valves. The main loop system consists of a pressure vessel simulator, a main pump, a flow meter, connecting pipes, and valves. The steam and inert gas pressure stabilization system consists of a steam pressure regulator simulator, an inert gas pressure regulator simulator, a charging pump, connecting pipes, and valves. The drainage system consists of a drainage tank, a heat exchanger, a flow meter, connecting pipes, and valves.

2. The multifunctional test bench according to claim 1, characterized in that, The water tank is equipped with an electric heater and an insulation layer; the connecting pipe is equipped with an electric heater and an insulation layer; and the steam pressure regulator simulator is equipped with an electric heater and an insulation layer.

3. The multifunctional test bench according to claim 2, characterized in that, The pressure vessel simulator is equipped with an exhaust valve and a safety valve at the top, and is connected to a drainage system at the bottom via a connecting pipe; the pressure vessel simulator is equipped with an insulation layer; the pressure vessel simulator is equipped with temperature measuring points and pressure measuring points.

4. The multifunctional test bench according to claim 3, characterized in that, The steam pressure regulator simulator is equipped with an exhaust valve and a safety valve at the top; pressure measuring points are located at the top of the steam pressure regulator simulator, and temperature measuring points are located at different positions from top to bottom; the bottom of the steam pressure regulator simulator is connected to the main circuit system.

5. The multifunctional test bench according to claim 4, characterized in that, The inert gas pressure regulator simulator is equipped with an exhaust valve, an inflation valve, and a safety valve at the top. The inflation valve is connected to a high-pressure inert gas storage bottle via a connecting pipe. The valve connecting the inert gas pressure regulator simulator to the high-pressure inert gas storage bottle and the top exhaust valve are controlled by a control system, which can adjust the pressure inside the inert gas pressure regulator simulator. The bottom of the inert gas pressure regulator simulator is connected to a drainage system. The inert gas pressure regulator simulator is equipped with pressure measuring points and temperature measuring points distributed at different locations from top to bottom.

6. The multifunctional test bench according to claim 5, characterized in that, The drainage tank is connected to the main circuit system and the inert gas pressure regulator simulator, respectively, and the drainage position is controlled by adjusting the opening and closing of the valve.

7. The multifunctional test bench according to claim 6, characterized in that, The drainage tank is equipped with a drainage valve at the bottom and a vent valve controlled by the control system at the top, which connects a high-pressure inert gas storage bottle and an exhaust valve controlled by the control system. The pressure in the drainage tank is regulated by the control system.

8. A test method based on the multifunctional test bench for studying the performance of a reactor primary circuit pressurizer as described in any one of claims 1-7, characterized in that, The method specifically involves heating the water in the water tank to a specified temperature using an electric heater in the water tank, and then turning off the electric heater. Open the top vent valve of each simulator, open the resin deaerator connection loop to deoxygenate the water entering the system, start the water replenishment pump, open the water replenishment valve in the system to replenish the system with water, and after the water is filled into each simulator, close the top vent valve in sequence; after the loop is filled with water, turn off the water replenishment pump. The back pressure of the drain tank is set by the control system, which then controls the replenishment of air into the drain tank to increase pressure or the exhaust of air to decrease pressure.

9. The method according to claim 8, characterized in that, When conducting tests using a steam pressure regulator simulator, close the valve connecting the inert gas pressure regulator simulator to the circuit; turn on the main pump to allow water to flow in the circuit; turn on the electric heater in the main circuit and the electric heater in the steam pressure regulator simulator to an appropriate power to allow the water in the circuit to heat up at a specified rate; control whether the heating rate in the circuit and the steam pressure regulator simulator are the same by adjusting the power of the electric heater and the opening and closing of the charging pump. When the specified pressure is reached in the circuit, the connecting valve between the circuit and the drain tank is opened to drain the water. The valve opening can be adjusted according to the drainage speed requirements. After the pressure is reduced to the specified pressure, the connecting valve is closed to end the drainage. After the steam pressure regulator simulator reaches the specified temperature, the electric heater in the main circuit is turned off, while the electric heater inside the steam pressure regulator remains on. The system drain valve is opened, and steam is generated inside the steam pressure regulator simulator, and the steam chamber begins to form. At this time, the drain is opened. By adjusting the switch of the electric heater, the temperature is controlled to be maintained above the saturation temperature, and the pressure is maintained near the pressure corresponding to the saturation temperature, until the specified liquid level is reached in the steam pressure regulator simulator. The steam chamber is then established, and the startup process is complete.

10. The method according to claim 8, characterized in that, When conducting the test using an inert gas pressure regulator simulator, close the valve connecting the steam pressure regulator simulator to the circuit, open the inert gas pressure regulator simulator inflation valve, pressurize the system using a high-pressure inert gas storage bottle, adjust the back pressure of the pressure relief valve to the specified pressure through the control system, open the system drain valve connecting the inert gas pressure regulator simulator to the drain tank, drain and pressurize the inert gas pressure regulator simulator, and close the system drain valve when the water level in the inert gas pressure regulator simulator reaches the specified level, thus ending the inflation and pressurization process. Turn on the main pump to start the water flow in the circuit; turn on the electric heater in the main circuit to the appropriate power so that the water in the circuit heats up at the specified rate. When the specified pressure is reached in the circuit, open the connecting valve between the inert gas regulator simulator and the circuit or the connecting valve between the circuit and the drain tank to drain the water. After the pressure is reduced to the specified pressure, close the connecting valve to end the drainage. After the water in the circuit and pressure vessel simulator is heated to the specified temperature, the electric heater in the main circuit is turned off, completing the startup process.

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