Test system for simulating passive safety injection pipeline fracture

Abstract

The invention belongs to the technical field of reactor thermal hydraulics, and particularly relates to a test system for simulating passive safety injection pipeline fracture. The system comprises a full-pressure water replenishing tank simulation body and a crevasse pipeline, the top of the full-pressure water replenishing tank simulator is connected with the pressure vessel simulator cold pipe section through a balance pipeline, and the bottom of the full-pressure water replenishing tank simulator is communicated with the pressure vessel simulator descending ring cavity through a DVI header pipe; a first isolating valve is arranged on the balance pipeline; the two ends of the crevasse pipeline are connected to the two ends of the first isolation valve through the second isolation valve and the third isolation valve correspondingly. A fourth isolating valve is arranged on the DVI header pipe; the two ends of the crevasse pipeline are connected to the two ends of the fourth isolation valve through a fifth isolation valve and a sixth isolation valve correspondingly. Wherein the crevasse pipeline is connected in series with at least one crevasse simulation piece. The embodiment of the invention can be used for carrying out the response characteristic test of the passive safety injection system under the conditions of small crevasses and double-end breakage in a balance pipe and a DVI pipe.

Description

Technical Field

[0001] The present application belongs to the field of reactor thermal hydraulic technology, and specifically relates to a test system for simulating the rupture of a passive injection pipeline. Background Art

[0002] Third-generation nuclear power technology improves upon traditional active safety systems by employing advanced passive systems to enhance nuclear reactor safety. These passive safety systems utilize natural driving forces such as gas expansion, gravity flow, natural circulation, and convection, reducing reliance on active components such as pumps, fans, and generators. This simplifies reactor system design and improves operational reliability. The passive injection system utilizes a full-pressure make-up water tank for high-pressure injection. The top of the make-up water tank is connected to the cold section of the main pipeline via a balancing line, while the bottom is connected to the pressure vessel downcomer via a high-pressure injection line through the direct-injection (DVI) manifold. Following a nuclear reactor accident, the make-up water tank is deployed to replenish primary coolant loss and cool the reactor core. As can be seen, the passive injection system significantly impacts the overall nuclear reactor accident process. Failure of the passive injection system significantly reduces the passive injection's ability to respond to a loss-of-coolant accident. Therefore, the design reliability of the passive system in response to nuclear reactor safety accidents is of vital importance. How to simulate the rupture of the passive injection pipe of an advanced pressurized water reactor and carry out the test of the passive injection system's ability to mitigate the nuclear reactor core loss of coolant accidents under the conditions of double-end breakage of the balance pipe, double-end breakage of the DVI pipe, small and medium-sized rupture of the balance pipe, and small and medium-sized rupture of the DVI pipe have become urgent issues to be solved. Summary of the Invention

[0003] The purpose of this application is to provide a test system for simulating the rupture of passive safety injection pipes, so as to solve the problem of how to simulate the rupture of passive safety injection pipes of advanced pressurized water reactors.

[0004] Technical solution to achieve the purpose of this application:

[0005] The embodiment of the present application provides a test system for simulating the rupture of a passive safety injection pipeline, the system comprising: a full-pressure water supply tank simulation body and a rupture pipeline;

[0006] The top of the full-pressure water supply tank simulation body is connected to the cold pipe section of the pressure vessel simulation body through a balance pipeline, and the bottom is connected to the descending annular cavity of the pressure vessel simulation body through the DVI main pipe, forming a circular flow between the full-pressure water supply tank simulation body and the pressure vessel simulation body;

[0007] A first isolation valve is provided on the balancing pipeline; both ends of the breached pipeline are connected to both ends of the first isolation valve through a second isolation valve and a third isolation valve respectively;

[0008] A fourth isolation valve is provided on the DVI main pipe; both ends of the broken pipeline are connected to both ends of the fourth isolation valve through a fifth isolation valve and a sixth isolation valve respectively;

[0009] Wherein, at least one rupture simulation component is connected in series to the rupture pipeline.

[0010] Optionally, a plurality of rupture simulation components are connected in series on the rupture pipeline, and each of the rupture simulation components has a different aperture.

[0011] Optionally, the second isolation valve, the third isolation valve, the fifth isolation valve and the sixth isolation valve are quick-opening valves.

[0012] Optionally, the system further comprises: a steam-water separator;

[0013] The steam-water separator is connected to the downstream of the rupture simulation component and is used to separate the steam and water phases after the pressure is released from the rupture simulation component.

[0014] Optionally, a steam flow meter is connected to the top of the steam-water separator.

[0015] Optionally, a condensate flow meter is connected to the bottom of the steam-water separator.

[0016] Optionally, when two rupture simulation components are connected in series on the rupture pipeline: a first rupture simulation component and a second rupture simulation component, the steam-water separator is connected between the first rupture simulation component and the second rupture simulation component.

[0017] Optionally, a check valve is connected in series on the DVI main pipe.

[0018] Optionally, a throttling device is connected in series to the DVI main pipe.

[0019] Optionally, a safety injection start valve is also connected in series on the DVI main pipe.

[0020] The beneficial technical effects of this application are:

[0021] An embodiment of the present application provides a test system for simulating the rupture of a non-passive injection pipeline, comprising: a full-pressure water supply tank simulation body and a rupture pipeline; the top of the full-pressure water supply tank simulation body is connected to the cold pipe section of the pressure vessel simulation body through a balancing pipeline, and the bottom is connected to the descending annular cavity of the pressure vessel simulation body through a DVI main pipe, forming a circulating flow between the full-pressure water supply tank simulation body and the pressure vessel simulation body; a first isolation valve is provided on the balancing pipeline; the two ends of the rupture pipeline are respectively connected to the two ends of the first isolation valve through a second isolation valve and a third isolation valve; a fourth isolation valve is provided on the DVI main pipe; the two ends of the rupture pipeline are respectively connected to the two ends of the fourth isolation valve through a fifth isolation valve and a sixth isolation valve; wherein, at least one rupture simulation component is connected in series on the rupture pipeline. The embodiments of the present application can be used to carry out tests on the response characteristics of passive injection systems under conditions of rupture at the balance pipe and DVI pipe, as well as double-end failure. This can maximize the test conditions for passive injection pipeline rupture, provide feedback on the design of passive injection systems for advanced nuclear reactors, and provide a solid technical foundation for nuclear safety review and nuclear safety analysis of advanced pressurized water reactors. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a test system for simulating the rupture of a passive injection pipeline provided in an embodiment of the present application.

[0023] In the picture:

[0024] 1-pressure vessel simulation body; 2-core simulation body; 3-full-pressure water supply tank simulation body; 4-steam-water separator; 5-cold pipe section; 6-third isolation valve; 7-first isolation valve; 8-balancing pipeline; 9-second isolation valve; 10-first rupture simulation component; 11-fifth isolation valve; 12-fourth isolation valve; 13-DVI main pipe; 14-sixth isolation valve; 15-second rupture simulation component; 16-steam flowmeter; 17-condensate flowmeter; 18-check valve; 19-throttling device; 20-injection start valve. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of them. Based on the embodiments recorded in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0026] See also Figure 1 , which is a structural schematic diagram of a test system for simulating the rupture of a passive injection pipeline provided in an embodiment of the present application.

[0027] The embodiment of the present application provides a test system for simulating the rupture of a passive safety injection pipeline, comprising: a full-pressure water supply tank simulation body 3 and a rupture pipeline;

[0028] The top of the full-pressure water supply tank simulation body 3 is connected to the cold pipe section 5 of the pressure vessel simulation body 1 through the balance pipeline 8, and the bottom is connected to the descending annular cavity of the pressure vessel simulation body 1 through the DVI main pipe 13, forming a circular flow between the full-pressure water supply tank simulation body 3 and the pressure vessel simulation body 1;

[0029] A first isolation valve 7 is provided on the balancing pipeline 8; both ends of the breached pipeline are connected to both ends of the first isolation valve 7 via a second isolation valve 9 and a third isolation valve 6 respectively;

[0030] A fourth isolation valve 12 is provided on the DVI main pipe 13; both ends of the breached pipeline are connected to both ends of the fourth isolation valve 12 via a fifth isolation valve 11 and a sixth isolation valve 14 respectively;

[0031] Wherein, at least one rupture simulation component is connected in series to the rupture pipeline.

[0032] In the embodiment of the present application, the top of the full-pressure water-making tank simulation body 3 is connected to the cold pipe section 5 through the balance line 8, and the bottom is connected to the descending annular cavity of the pressure vessel simulation body 1 through the DVI main pipe 13, so that a circulating flow is formed between the full-pressure water-making tank simulation body 3 and the pressure vessel simulation body 1. The injection pipeline of the full-pressure water-making tank simulation body 1 can be provided with a check valve and an isolation valve, which are respectively used to control the flow direction of the high-pressure injection and the start of the high-pressure injection. The throttling device of the high-pressure injection pipeline is used to adjust the injection flow resistance. At least one rupture simulation component is connected in series on the rupture pipeline, which can be used to carry out a non-passive injection system response characteristic test when the balance line 8 and the DVI main pipe 13 are in a rupture and double-end break state. The rupture pipeline simulation adopts the method of merging the double ends of the balancing pipeline 8 and the DVI main pipe 13 and passing through the rupture simulation component, which can maximize the test conditions of passive safety injection pipeline rupture, including: small and medium ruptures in the balancing pipeline 8, small and medium ruptures in the balancing pipeline 8 and the DVI main pipe 13 at the same time, ruptures at both ends of the balancing pipeline 8, small and medium ruptures in the DVI main pipe 13, ruptures at both ends of the DVI main pipe 13, and ruptures at both ends of the DVI main pipe 13 and the ruptures at both ends of the DVI main pipe 13 and the balancing pipeline 8.

[0033] During specific implementation, the pressure vessel simulation body 1 and the full-pressure make-up water tank simulation body 3 can be simulated according to the power-volume ratio criterion. The height of the heating section of the core simulation body 2, the height of the pressure vessel simulation body 1, the inner height of the full-pressure make-up water tank simulation body 3, the height difference between the center of the heating section of the full-pressure make-up water tank simulation body 3 and the core simulation body 2, the elevation of the DVI main pipe 13 and the cold pipe section 5 are all consistent with the prototype, which can effectively simulate the high-pressure passive injection characteristics of the prototype advanced pressurized water reactor.

[0034] In some possible implementations of the present application, such as Figure 1 As shown, a plurality of rupture simulation components can be connected in series on the rupture pipeline, and each rupture simulation component has a different aperture, which can simulate the response characteristic test of the passive injection system under rupture conditions of different sizes.

[0035] In a specific implementation, the second isolation valve 9 , the third isolation valve 6 , the fifth isolation valve 11 and the sixth isolation valve 14 may all be quick-opening valves.

[0036] In some possible implementations of the embodiments of the present application, the system may further include: a steam-water separator 4;

[0037] The steam-water separator 4 is connected to the downstream of the rupture simulation component, and is used to separate the steam and water phases after the pressure is released from the rupture simulation component.

[0038] It can be understood that a steam-water separator 4 is set downstream of the rupture simulation component to separate the steam and water phases after the pressure release from the rupture. After separation, the steam phase flows from the top of the steam-water separator 4 to the subsequent collection container, while the liquid phase flows into the collection container from the bottom of the steam-water separator 4 under the action of gravity.

[0039] In one example, a steam flow meter 16 is connected to the top of the steam-water separator 4 .

[0040] In another example, a condensate flowmeter 17 is connected to the bottom of the steam-water separator 4 .

[0041] It can be understood that after the coolant flows through the rupture, it is separated by the steam-water separator 4, and the steam flow rate and condensate flow rate are measured by the steam flow meter 16 and the condensate flow meter 17 respectively. The amount of coolant lost from the rupture can be monitored in real time, thereby being used to evaluate the water loss of the nuclear reactor system.

[0042] In a specific implementation, when two rupture simulation components are connected in series on the rupture pipeline: the first rupture simulation component 10 and the second rupture simulation component 15 , the steam-water separator 4 can be connected between the first rupture simulation component 10 and the second rupture simulation component 15 .

[0043] In some possible implementations of the embodiment of the present application, a check valve 18 is connected in series to the DVI main pipe 13 .

[0044] In one example, a throttle element 19 is further connected in series to the DVI main pipe 13 .

[0045] In another example, the DVI main pipe 13 is further connected in series with a safety injection start valve 20 .

[0046] A test system for simulating the rupture of a passive injection pipeline provided by an embodiment of the present application is described in detail below with reference to a specific example.

[0047] The specific implementation method of a test system for simulating the rupture of a passive injection pipeline provided in an embodiment of the present application is as follows:

[0048] 1. According to the equipment design drawings, process the pressure vessel simulation body 1, assemble the pressure vessel simulation body 1 and the core simulation body 2, the full-pressure water tank simulation body 3, the steam-water separator 4 and other equipment, and complete the processing and manufacturing of valves, flow meters and pipelines in accordance with technical requirements.

[0049] 2. According to the equipment layout drawing, fix the pressure vessel simulation body 1, the full-pressure water tank simulation body 3, and the steam-water separator 4 in the designated positions, and complete the installation of pipelines, valves and flow meters according to the construction axonometric drawing.

[0050] 3. Install a double-end broken size breach simulation piece at the breach simulation piece.

[0051] 4. Close valves 6, 9, 11, and 14, open valves 7, 12, and 20 to connect the entire circuit, fill the entire circuit with water, and then close valve 20.

[0052] 5. Start the core simulation body to increase the temperature and pressure of the circuit to the steady-state operating condition, switch the control of each valve from manual to automatic control, and close valve 12.

[0053] 6. Start the accident sequence. Valves 11 and 14 are opened according to the sequence settings. The primary circuit is depressurized through the rupture. After the safety injection signal arrives, valve 20 is automatically opened. The full-pressure water supply tank simulator is put into operation to perform high-pressure safety injection. Each system is put into operation in sequence until the test is completed, thus completing the DVI main pipe double-end break accident test.

[0054] 7. Maintain the above rupture simulation component size. After the system runs to a steady-state condition, close valve 7. In the accident sequence, change the rupture valve start-up (start valves 6 and 9) and carry out the balancing pipe double-end break water loss accident test according to the same process.

[0055] 8. Maintain the above rupture simulation component dimensions. After the system reaches steady-state operation, close valves 7 and 12 simultaneously. In the accident sequence, open valves 6, 9, 11, and 14, and carry out the balance pipe double-end break and DVI pipe double-end break limit rupture loss of water accident tests according to the same process.

[0056] 9. Replace the size of the rupture simulation part with a small or medium rupture. During the execution of the accident sequence, start valve 6 (or 9) and valve 14 (or 11) respectively to control the start of the rupture position, and carry out the water loss accident test with small or medium rupture of the balance pipe, small or medium rupture of the DVI pipe, or small or medium rupture of both.

[0057] The embodiment of the present application provides a test system for simulating the rupture of a passive safety injection pipeline. The system uses a balancing pipeline to connect the top of the full-pressure water supply tank simulation body, and uses a DVI safety injection main pipe to connect the bottom of the full-pressure water supply tank simulation body with the descending annular cavity of the pressure vessel simulation body, effectively simulating the natural circulation between the full-pressure water supply tank and the pressure vessel. By setting isolation valves on the balancing pipeline and the DVI safety injection main pipe, and merging the rupture pipelines in front of the rupture simulation part, the maximum simulation of water loss accidents of ruptures of different positions and sizes in the passive safety injection system is achieved. It can be used to study the system response characteristics under the conditions of water loss accidents in the passive safety injection system of advanced pressurized water reactors, and provide rich test data for the design and safety analysis of the passive safety injection system of prototype nuclear reactors.

[0058] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the purpose of the present application. Any content not described in detail in the present application may be based on existing technologies.

Claims

1. A test system for simulating the rupture of a passive injection pipeline, characterized in that: The system comprises: a full-pressure water supply tank simulation body (3) and a rupture pipeline; The top of the full-pressure water supply tank simulation body (3) is connected to the cold pipe section (5) of the pressure vessel simulation body (1) through the balance pipeline (8), and the bottom is connected to the descending annular cavity of the pressure vessel simulation body (1) through the DVI main pipe (13), so that a circulating flow is formed between the full-pressure water supply tank simulation body (3) and the pressure vessel simulation body (1); A first isolation valve (7) is provided on the balancing pipeline (8); both ends of the breaching pipeline are connected to both ends of the first isolation valve (7) via a second isolation valve (9) and a third isolation valve (6) respectively; A fourth isolation valve (12) is provided on the DVI main pipe (13); both ends of the breached pipeline are connected to both ends of the fourth isolation valve (12) via a fifth isolation valve (11) and a sixth isolation valve (14) respectively; Wherein, at least one rupture simulation component is connected in series to the rupture pipeline.

2. The test system for simulating passive injection pipeline rupture according to claim 1, characterized in that: A plurality of rupture simulation pieces are connected in series on the rupture pipeline, and each of the rupture simulation pieces has a different aperture.

3. The test system for simulating the rupture of a passive injection pipeline according to claim 1, characterized in that: The second isolation valve (9), the third isolation valve (6), the fifth isolation valve (11) and the sixth isolation valve (14) are quick-opening valves.

4. The test system for simulating passive injection pipeline rupture according to any one of claims 1 to 3, characterized in that: The system further comprises: a steam-water separator (4); The steam-water separator (4) is connected downstream of the rupture simulation component and is used to separate the steam and water phases after the pressure is released from the rupture simulation component.

5. The test system for simulating the rupture of a passive injection pipeline according to claim 4, characterized in that: The top of the steam-water separator (4) is connected to a steam flow meter (16).

6. The test system for simulating the rupture of a passive injection pipeline according to claim 4, characterized in that: The bottom of the steam-water separator (4) is connected to a condensate flow meter (17).

7. The test system for simulating the rupture of a passive injection pipeline according to claim 4, characterized in that: When two rupture simulation components are connected in series on the rupture pipeline: a first rupture simulation component (10) and a second rupture simulation component (15), the steam-water separator (4) is connected between the first rupture simulation component (10) and the second rupture simulation component (15).

8. The test system for simulating passive injection pipeline rupture according to any one of claims 1 to 3, characterized in that: A check valve (18) is connected in series to the DVI main pipe (13).

9. The test system for simulating the rupture of a passive injection pipeline according to claim 8, characterized in that: A throttling element (19) is also connected in series on the DVI main pipe (13).

10. The test system for simulating the rupture of a passive injection pipeline according to claim 8, characterized in that: The DVI main pipe (13) is also connected in series with an injection start valve (20).

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