Cooling system for irradiation test loop

Abstract

The invention provides an irradiation test loop cooling system which comprises a reactor water tank and a circulating flow path, and an irradiation test piece is arranged in the reactor water tank; a main circulating pump, at least one regenerative heat exchanger and at least one non-regenerative heat exchanger are arranged on the circulating flow path, the outlet end of the main circulating pump is connected with the irradiation test piece, and the non-regenerative heat exchanger is arranged in the reactor water tank; the coolant is driven by the main circulating pump to sequentially flow through the regenerative heat exchanger to the non-regenerative heat exchanger, and the coolant cooled by the non-regenerative heat exchanger serves as a secondary side coolant to be subjected to heat exchange with the regenerative heat exchanger and then returns to the irradiation test piece. According to the radiation test loop cooling system, the heat generated by the radiation test device can be transferred to the water tank without arranging huge and complex radiation loop II and III loop cooling systems, so that the operation conditions of the system are met.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear reactor irradiation testing, and in particular to a irradiation testing loop cooling system. Background Art

[0002] In the intergenerational evolution of nuclear reactors, irradiation performance tests are indispensable. Obtaining the in-pile irradiation performance of new fuels and new materials through irradiation tests and verifying their safety and reliability in the service environment are necessary conditions for the ultimate realization of engineering applications.

[0003] In existing pressurized water reactors, the fuel undergoes irradiation conditions such as high temperature and high pressure. Ordinary experimental equipment cannot simulate this harsh environment. Setting up an irradiation test loop in a pool-type research reactor to simulate the temperature, pressure, flow rate, water chemistry and irradiation conditions inside the pressurized water reactor and provide the operating parameters and water quality conditions of the pressurized water reactor for fuel and material irradiation tests is an effective way to achieve the irradiation test goals.

[0004] Existing pressurized water reactor nuclear power plants are generally designed with three cooling systems: primary cooling system, secondary cooling system, and tertiary cooling system. The specific functions of the three cooling systems are as follows: the primary cooling system is driven by the main circulation pump to flow the reactor coolant through the core and take away the core heat; the secondary cooling system uses the steam turbine generator to convert the heat energy obtained from the primary cooling system into electrical energy; the tertiary cooling system is the final heat sink of the nuclear power plant, condensing the spent steam and taking away the waste heat of the power plant. The three cooling system pipelines in the nuclear power plant are complicated, the design is difficult, and the cost is also high.

[0005] The irradiation test circuit needs to simulate the temperature, pressure, water chemistry and irradiation conditions inside the pressurized water reactor. According to the existing design plan of the pressurized water reactor nuclear power plant, in order to achieve continuous and stable operation of the high-temperature and high-pressure irradiation test circuit, one, two and three circuit cooling systems need to be set up to take away the heat from the irradiation test device.

[0006] Considering that the high-temperature and high-pressure irradiation test loop is a non-critical test device, it relies on the neutrons provided by the pool-type research reactor to maintain the chain fission reaction. The heat source of the irradiation test loop mainly comes from the radiation heat generated by the irradiated small components. Compared with traditional nuclear power plants, the heat load of the irradiation test loop is smaller. If traditional solutions want to meet the test conditions, they have the defects of difficult design and construction and high cost.

[0007] Based on this, the inventor of the present application proposes a radiation test circuit cooling system in order to solve the above technical problems. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a radiation test loop cooling system in order to overcome the defect that the test conditions are difficult to meet in the prior art.

[0009] The present invention solves the above technical problems through the following technical solutions:

[0010] The present invention provides a radiation test circuit cooling system, which is characterized by comprising:

[0011] A reactor pool, in which the irradiation test piece is arranged;

[0012] A circulation flow path is provided with a main circulation pump, at least one regenerative heat exchanger and at least one non-regenerative heat exchanger, the outlet end of the main circulation pump is connected to the irradiation test piece, and the non-regenerative heat exchanger is arranged in the reactor water pool; wherein,

[0013] Driven by the main circulation pump, the coolant flows through the regenerative heat exchanger to the non-regenerative heat exchanger in sequence. The coolant cooled by the non-regenerative heat exchanger is used as a secondary side coolant to exchange heat with the regenerative heat exchanger and then returns to the irradiation test piece.

[0014] According to one embodiment of the present invention, the number of the regenerative heat exchanger and the number of the non-regenerative heat exchanger are at least two respectively;

[0015] Each of the regenerative heat exchangers corresponds to one of the non-regenerative heat exchangers, and at least two of the regenerative heat exchangers and at least two of the non-regenerative heat exchangers are respectively arranged in parallel.

[0016] According to one embodiment of the present invention, the circulation flow path is provided with a first branch upstream of the regenerative heat exchanger, and the first branch is communicated with the inlet of the main circulation pump;

[0017] The first branch is provided with a bypass isolation valve and a bypass regulating valve.

[0018] According to one embodiment of the present invention, a primary side inlet isolation valve and a primary side outlet isolation valve are provided on opposite sides of each of the regenerative heat exchangers.

[0019] According to one embodiment of the present invention, a non-regenerative heat exchanger outlet regulating valve is provided between the downstream of the non-regenerative heat exchanger and the regenerative heat exchanger.

[0020] According to one embodiment of the present invention, the non-regenerative heat exchanger is further provided with a regenerative heat exchanger secondary side inlet isolation valve and a regenerative heat exchanger secondary side outlet isolation valve downstream of the non-regenerative heat exchanger outlet regulating valve;

[0021] The secondary side inlet isolation valve of the regenerative heat exchanger and the secondary side outlet isolation valve of the regenerative heat exchanger are respectively arranged on two opposite sides of the regenerative heat exchanger.

[0022] According to one embodiment of the present invention, an emergency waste heat removal system is connected between the downstream of the non-regenerative heat exchanger and the outlet regulating valve of the non-regenerative heat exchanger.

[0023] According to one embodiment of the present invention, a main pump bypass regulating valve and a main pump bypass isolating valve are provided between the downstream of the main circulation pump and the irradiation test piece.

[0024] According to one embodiment of the present invention, an emergency waste heat removal system is connected downstream of the main pump bypass regulating valve and the main pump bypass isolation valve.

[0025] According to one embodiment of the present invention, a pressure stabilizer is provided upstream of the regenerative heat exchanger, and a safety valve and an exhaust valve are provided on the pressure stabilizer for exhausting the system.

[0026] The positive and progressive effects of the present invention are:

[0027] The irradiation test loop cooling system of the present invention provides at least one regenerative heat exchanger and a non-regenerative heat exchanger in the system. When the system is operating normally, heat can be transferred to the water pool through the non-regenerative heat exchanger, thereby effectively utilizing the inherent heat sink of the pool-type research reactor and avoiding the adverse working condition of film boiling caused by direct heat exchange of high-temperature coolant in the water pool.

[0028] The system does not need to set up a large and complex irradiation circuit second and third circuit cooling system, and can transfer the heat generated by the irradiation test device to the water pool to meet the system's operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0030] Figure 1 A schematic diagram of an embodiment of the irradiation test circuit cooling system of the present invention;

[0031] Figure 2 A schematic diagram of another embodiment of the irradiation test loop cooling system of the present invention;

[0032] Figure 3 A schematic diagram of another embodiment of the irradiation test circuit cooling system of the present invention;

[0033] Figure 4 This is a schematic diagram of another embodiment of the irradiation test loop cooling system of the present invention.

[0034] 1. Reactor pool;

[0035] 2. Irradiation test pieces;

[0036] 3. Circulation flow path; 31. First branch; 32. Bypass isolation valve; 33. Bypass regulating valve;

[0037] 4. Main circulation pump; 41. Main pump bypass regulating valve; 42. Main pump bypass isolation valve;

[0038] 5. Regenerative heat exchanger; 51. Primary side inlet isolation valve; 52. Primary side outlet isolation valve; 53. Regenerative heat exchanger secondary side inlet isolation valve; 54. Regenerative heat exchanger secondary side outlet isolation valve;

[0039] 6. Non-regenerative heat exchanger; 61. Non-regenerative heat exchanger outlet regulating valve;

[0040] 7. Emergency waste heat removal system; 71. Water chemical system; 72. Water replenishment and deoxygenation system; 73. Safety injection system;

[0041] 8. Voltage stabilizer; 81. Safety valve; 82. Exhaust valve. DETAILED DESCRIPTION

[0042] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0044] Please refer to Figures 1 to 4 The present invention provides an irradiation test loop cooling system, the system includes a reactor water pool 1 and a circulation flow path 3, and the irradiation test piece 2 is arranged in the reactor water pool 1.

[0045] Specifically, the irradiated test piece 2 is placed in the reactor pool 1, and the chain fission reaction is maintained by relying on the neutrons provided by the reactor. Figure 1 In the figure, the left end of the reactor pool 1 is inside the pool, and the right end is outside the pool; the right end of the reactor pool 1 is inside the pool, and the left end is outside the pool. The reactor pool 1 here is only an example, and the specific structure is not limited. The irradiated test piece 2 and the non-regenerative heat exchanger 5 described below can be placed in one pool or in two pools, which is not limited here.

[0046] It can be seen that the circulation flow path 3 is provided with a main circulation pump 4, at least one regenerative heat exchanger 5 and at least one non-regenerative heat exchanger 6, the outlet end of the main circulation pump 4 is connected to the irradiation test piece 2, and the non-regenerative heat exchanger 6 is arranged in the reactor water pool 1. Among them, the coolant flows through the regenerative heat exchanger 5 to the non-regenerative heat exchanger 6 in sequence under the drive of the main circulation pump 4, and the coolant cooled by the non-regenerative heat exchanger 6 is used as the secondary side coolant to exchange heat with the regenerative heat exchanger 5 and then returns to the irradiation test piece 2.

[0047] Among them, the regenerative heat exchanger 5 performs the first heat exchange to reduce the temperature of the coolant, avoiding the heated coolant from directly entering the reactor water pool 1 for heat exchange. The large temperature difference between the coolant and the pool water in the loop will cause violent film boiling on the surface of the heat exchanger, seriously affecting the performance of the material and the safety of the irradiation test device.

[0048] In this way, part of the coolant heated by the irradiated test piece 2 flows through the primary side of the regenerative heat exchanger 5, and the primary side coolant is cooled once by the secondary side coolant in the regenerative heat exchanger 5. The cooled coolant flows through the non-regenerative heat exchanger 6, and the pool water in the pool is used as a heat sink. The non-regenerative heat exchanger 6 transfers the heat to the pool water, thereby realizing the extraction of heat from the circulating flow path 3.

[0049] The temperature of the coolant after heat exchange with the pool water is relatively low, and there is a large temperature difference with the hot pipe section at the outlet of the irradiation test piece 2. Therefore, the coolant after heat exchange in the non-regenerative heat exchanger 6 flows through the secondary side of the regenerative heat exchanger 5, and the coolant is heated by the primary side of the regenerative heat exchanger 5. The heated coolant returns to the main pump inlet and returns to the irradiation test piece 2 to complete a cycle.

[0050] In one embodiment, the number of regenerative heat exchangers 5 and non-regenerative heat exchangers 6 is at least two respectively; each regenerative heat exchanger 5 corresponds to a non-regenerative heat exchanger 6, and at least two regenerative heat exchangers 5 and at least two non-regenerative heat exchangers 6 are respectively arranged in parallel.

[0051] That is, multiple sets of heat exchangers connected in parallel can be set according to the test requirements, and each set of heat exchangers includes a regenerative heat exchanger 5 and a non-regenerative heat exchanger 6. For example, Figure 1 In the figure, two groups of regenerative heat exchangers 5 and two groups of non-regenerative heat exchangers 6 are taken as an example for explanation. Figure 2 In the figure, a regenerative heat exchanger 5 and a non-regenerative heat exchanger 6 are taken as examples for explanation.

[0052] Specifically, the circulation flow path 3 is provided with a first branch 31 upstream of the regenerative heat exchanger 5 , and the first branch 31 is connected to the inlet of the main circulation pump 4 ; the first branch 31 is provided with a bypass isolation valve 32 and a bypass regulating valve 33 .

[0053] Furthermore, a main pump bypass regulating valve 41 and a main pump bypass isolating valve 42 are provided between the downstream of the main circulation pump 4 and the irradiation test piece 2 .

[0054] In order to meet the irradiation tasks of different powers and different flow rates of the circulation flow path 3, a bypass isolation valve 32, a bypass regulating valve 33, a main pump bypass regulating valve 41 and a main pump bypass isolation valve 42 are set. The bypass isolation valve 32 and the bypass regulating valve 33 can adjust the flow rate of the coolant delivered to the regenerative heat exchanger 5 through the irradiation test piece 2, thereby meeting the heat exchange requirements of different powers of the system. The main pump bypass regulating valve 41 and the main pump bypass isolation valve 42 can adjust the flow rate delivered to the irradiation test piece 2.

[0055] It can be seen that a primary side inlet isolation valve 51 and a primary side outlet isolation valve 52 are provided on opposite sides of each regenerative heat exchanger 5 .

[0056] At the same time, a regenerative heat exchanger secondary side inlet isolation valve 53 and a regenerative heat exchanger secondary side outlet isolation valve 54 are also provided downstream of the non-regenerative heat exchanger 6 and downstream of the non-regenerative heat exchanger outlet regulating valve 61; the regenerative heat exchanger secondary side inlet isolation valve 53 and the regenerative heat exchanger secondary side outlet isolation valve 54 are respectively arranged on opposite sides of the regenerative heat exchanger 5.

[0057] Furthermore, a non-regenerative heat exchanger outlet regulating valve 61 is provided between the downstream of the non-regenerative heat exchanger 6 and the regenerative heat exchanger 5 .

[0058] That is, the temperature of the coolant flowing through the non-regenerative heat exchanger 6 is relatively low, so that it returns to the secondary side coolant of the regenerative heat exchanger 5 to exchange heat with it. On the one hand, the hot coolant flowing through the regenerative heat exchanger 5 is exchanged with heat to prevent the overheated coolant from flowing directly into the water pool and causing violent film boiling on the surface of the non-regenerative heat exchanger 6. On the other hand, the heated coolant returns to the irradiated test piece 2 to reduce the temperature difference between the hot pipe section at the outlet of the irradiated test piece 2 and the hot pipe section at the outlet of the irradiated test piece 2.

[0059] Please continue to refer to Figure 1 An emergency waste heat removal system 7 is connected between the downstream of the non-regenerative heat exchanger 6 and the non-regenerative heat exchanger outlet regulating valve 61.

[0060] It can be seen that the emergency waste heat removal system 7 is connected downstream of the main pump bypass regulating valve 41 and the main pump bypass isolation valve 42 .

[0061] In the event of a power failure, the emergency residual heat removal system 7 provides emergency core cooling by means of the non-regenerative heat exchanger 6 .

[0062] In addition, the circulation flow path 3 is also provided with an injection system 73, a water replenishment and deoxygenation system 72, a water chemical system 71, etc. The injection system 73 is located at the inlet and outlet of the irradiation test piece 2. The interfaces of the water replenishment and deoxygenation system 72, the water chemical system 71 and the system are all located downstream of the non-regenerative heat exchanger 6, where the coolant temperature is relatively low, which can reduce the thermal stress caused by the temperature difference with the interface system.

[0063] Please refer to Figure 2 The circulation circuit 3 may be provided with a water chemical system 71, a water replenishment and deoxygenation system 72, and an emergency waste heat removal system 7. Figure 4 , only the water chemical system 71 and the emergency waste heat removal system 7 can be set on the circulation flow path 3. The specific adjustment can be made according to actual needs and is not limited here.

[0064] Please refer to Figure 3 , the valves of the circulation flow path 3 can be replaced with other numbers or other types of valve configurations or other valves can be added. The specific types are only given as examples and are not limited here.

[0065] Please continue to refer to Figure 1 A pressure regulator 8 is provided upstream of the regenerative heat exchanger 5, and a safety valve 81 and an exhaust valve 82 are provided on the pressure regulator 8 for exhausting the system.

[0066] The pressure regulator 8 is located downstream of the irradiation test piece 2 and is used to maintain a stable system pressure. A safety valve 81 and an exhaust valve 82 are provided on the pressure regulator 8 to exhaust the system and provide overpressure protection.

[0067] It can be seen that when the system is operating normally, the irradiated test piece 2 contains small components that radiate heat, and the main circulation pump 4 in the circulation flow path 3 allows pressurized water to pass through the irradiated test piece 2 and take out the heat generated by the irradiated test piece 2. If the coolant heated by the irradiated test piece 2 directly enters the water pool for heat exchange, the large temperature difference between the coolant and the pool water in the loop will cause violent film boiling on the surface of the heat exchanger, seriously affecting the performance of the material and the safety of the irradiated test piece 2.

[0068] Based on this, the heat exchanger group in the present invention adopts the form of a combination of a regenerative heat exchanger 5 and a non-regenerative heat exchanger 6. The coolant heated by the irradiated test piece 2 flows through the primary side of the regenerative heat exchanger 5, and the primary side coolant is cooled once by the secondary side coolant in the regenerative heat exchanger 5. The cooled coolant flows through the non-regenerative heat exchanger 6, and the pool water in the reactor pool 1 is used as a heat sink. The non-regenerative heat exchanger 6 transfers heat to the pool water, thereby realizing the heat extraction of the circulation flow path 3. The coolant temperature after heat exchange with the pool water is relatively low, and there is a large temperature difference with the hot pipe section at the outlet of the irradiated test piece 2. Therefore, the coolant after heat exchange with the non-regenerative heat exchanger 6 is further passed through the secondary side of the regenerative heat exchanger 5, and the coolant is heated by the primary side of the regenerative heat exchanger 5. The heated coolant returns to the inlet of the main circulation pump 4 and is combined with the coolant flowing through the bypass part of the heat exchanger to complete a cycle.

[0069] When power is lost, the emergency residual heat removal system 7 provides emergency core cooling by means of the non-regenerative heat exchanger 6 .

[0070] In summary, the irradiation test loop cooling system provided by the present invention does not need to set up large and complex irradiation loop second and third loop cooling systems, and effectively utilizes the inherent heat sink of the pool-type research reactor, which can not only meet the interface requirements of related systems, but also realize the heat extraction of the irradiation test device. The system is simple and highly reliable, which can greatly reduce the design and construction costs of the irradiation test loop.

[0071] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0072] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0073] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. An irradiation test circuit cooling system, characterized in that: include: A reactor pool, in which the irradiation test piece is arranged; A circulation flow path is provided with a main circulation pump, at least one regenerative heat exchanger and at least one non-regenerative heat exchanger, the outlet end of the main circulation pump is connected to the irradiation test piece, and the non-regenerative heat exchanger is arranged in the reactor water pool; wherein, Driven by the main circulation pump, the coolant flows through the regenerative heat exchanger to the non-regenerative heat exchanger in sequence. The coolant cooled by the non-regenerative heat exchanger is used as a secondary side coolant to exchange heat with the regenerative heat exchanger and then returns to the irradiation test piece.

2. The irradiation test circuit cooling system according to claim 1, characterized in that: The number of the regenerative heat exchangers and the number of the non-regenerative heat exchangers are at least two respectively; Each of the regenerative heat exchangers corresponds to one of the non-regenerative heat exchangers, and at least two of the regenerative heat exchangers and at least two of the non-regenerative heat exchangers are respectively arranged in parallel.

3. The irradiation test circuit cooling system according to claim 1, characterized in that: The circulation flow path is provided with a first branch upstream of the regenerative heat exchanger, and the first branch is communicated with the inlet of the main circulation pump; The first branch is provided with a bypass isolation valve and a bypass regulating valve.

4. The irradiation test circuit cooling system according to claim 1, characterized in that: A primary side inlet isolation valve and a primary side outlet isolation valve are provided on opposite sides of each regenerative heat exchanger.

5. The irradiation test circuit cooling system according to claim 1, characterized in that: A non-regenerative heat exchanger outlet regulating valve is provided between the downstream of the non-regenerative heat exchanger and the regenerative heat exchanger.

6. The irradiation test circuit cooling system according to claim 5, characterized in that: The non-regenerative heat exchanger is also provided with a regenerative heat exchanger secondary side inlet isolation valve and a regenerative heat exchanger secondary side outlet isolation valve downstream of the non-regenerative heat exchanger outlet regulating valve; The secondary side inlet isolation valve of the regenerative heat exchanger and the secondary side outlet isolation valve of the regenerative heat exchanger are respectively arranged on two opposite sides of the regenerative heat exchanger.

7. The irradiation test circuit cooling system according to claim 5, characterized in that: An emergency waste heat discharge system is connected between the downstream of the non-regenerative heat exchanger and the outlet regulating valve of the non-regenerative heat exchanger.

8. The irradiation test circuit cooling system according to claim 1, characterized in that: A main pump bypass regulating valve and a main pump bypass isolating valve are provided between the downstream of the main circulation pump and the irradiation test piece.

9. The irradiation test circuit cooling system according to claim 8, characterized in that: An emergency waste heat removal system is connected downstream of the main pump bypass regulating valve and the main pump bypass isolation valve.

10. The irradiation test circuit cooling system according to claim 1, characterized in that: A pressure stabilizer is provided upstream of the regenerative heat exchanger, and a safety valve and an exhaust valve are provided on the pressure stabilizer for exhausting the system.

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