Irradiation test system suitable for lead-bismuth reactor

Abstract

The invention relates to the technical field of irradiation tests. The invention discloses an irradiation test system suitable for a lead-bismuth reactor. The irradiation test system comprises a main cooling system, a switching system and an irradiation test subsystem. The multiple irradiation test subsystems are arranged, and the types of cooling media in the multiple irradiation test subsystems are different. The plurality of irradiation test subsystems are connected with the main cooling system through the switching system, and the main cooling system is used for cooling a cooling medium in at least one irradiation test subsystem. The main cooling system and the multiple irradiation test subsystems are arranged, the types of the cooling media in the multiple irradiation test subsystems are different, at least one irradiation test subsystem can be cooled through the main cooling system, and the cooling media in the multiple irradiation test subsystems can be cooled through the main cooling system according to the requirements of the test fuel assembly. And the switching system is used for switching to a required cooling medium environment, so that the construction cost of the test system is reduced, the occupied space is reduced, and the utilization efficiency of the test system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of irradiation testing, and in particular to an irradiation testing system suitable for a lead-bismuth reactor. Background Art

[0002] The development of fuel elements is an important step in the development process of new reactors. The development and engineering application of fuel elements require the construction of a new irradiation test loop to carry out fuel irradiation tests in the prototype reactor environment to study and verify the actual performance of the fuel elements. There are two forms of fuel irradiation tests: on-core irradiation and loop irradiation. Compared with on-core irradiation, loop irradiation can directly simulate the prototype reactor coolant environment, has a higher heat exchange power, and can flexibly adjust the flow, temperature, and chemical concentration required for the test during the test. The irradiation test loop that can be used for irradiation tests of new reactor fuels is an important basic scientific research platform for reactor research, but the irradiation test loop is expensive, and the differences in the structure, composition, and physical properties of different cooling media of the irradiation test loop limit each irradiation test loop to only be applicable to a fixed reactor type fuel. To conduct irradiation tests of multiple reactor types of fuels, it is necessary to build multiple irradiation test loops with different cooling media, which is very expensive and has low utilization.

[0003] Therefore, it is necessary to invent an irradiation test circuit suitable for lead-bismuth reactors, which can simulate the cooling medium environment of different reactor types and realize irradiation tests of multiple fuels in one circuit. Summary of the invention

[0004] In view of this, the present invention provides an irradiation test system suitable for a lead-bismuth reactor.

[0005] Specifically, the following technical solutions are included:

[0006] An irradiation test system suitable for a lead-bismuth reactor, comprising:

[0007] Main cooling system, switching system and irradiation test subsystem;

[0008] The irradiation test subsystems are provided in plurality, and the types of cooling media in the plurality of irradiation test subsystems are different;

[0009] A plurality of the irradiation test subsystems are connected to the main cooling system via the switching system, and the main cooling system is used to cool the cooling medium in at least one of the irradiation test subsystems.

[0010] Preferably, the switching system comprises an inlet switching device and an outlet switching device;

[0011] The inlet switching device is arranged at the inlet of the main cooling system, and the outlet switching device is arranged at the outlet of the main cooling system;

[0012] The inlet switching device includes an inlet collector and a plurality of inlet collecting pipes, the plurality of inlet collecting pipes and the inlet collector can be connected in an on-off manner, the inlet collector is connected to the inlet of the main cooling system, and the inlet collecting pipes and the irradiation test subsystem are arranged in a one-to-one correspondence;

[0013] The outlet switching device includes an outlet distributor and a plurality of outlet distribution pipes, the plurality of outlet distribution pipes and the outlet distributor can be connected in an on-off manner, the outlet distributor is connected to the outlet of the main cooling system, and the outlet distribution pipes and the irradiation test subsystems are arranged in a one-to-one correspondence;

[0014] The outlet distribution pipe is used to deliver the coolant in the main cooling system into the target irradiation test subsystem, and the inlet collecting pipe is used to recover the coolant in the main cooling system that flows back from the target irradiation test subsystem.

[0015] Preferably, the irradiation test system applicable to the lead-bismuth reactor further comprises a control system;

[0016] The switching system and the control system are electrically connected or wirelessly connected in communication;

[0017] The control system is used to determine the target irradiation test subsystem based on the type of cooling medium, and control the switching system to connect the main cooling system and the target irradiation test subsystem.

[0018] Preferably, the irradiation test subsystem includes a test heat exchanger;

[0019] The main cooling system includes a primary cooling circuit and a secondary cooling circuit;

[0020] The primary cooling circuit is connected to the test heat exchanger through the switching system, the primary cooling circuit and the test heat exchanger perform heat exchange, and the secondary cooling circuit and the primary cooling circuit perform heat exchange.

[0021] Preferably, the primary cooling circuit comprises a precooling heat exchanger and a main heat exchanger;

[0022] A first coolant is arranged in the primary cooling circuit, and a second coolant is arranged in the secondary cooling circuit;

[0023] The first coolant flowing out of the test heat exchanger flows through the precooling heat exchanger, the main heat exchanger, and the precooling heat exchanger in sequence, and flows into the test heat exchanger. The first coolant flowing out of the test heat exchanger and the first refrigerant flowing into the test heat exchanger enter heat exchange in the precooling heat exchanger.

[0024] The first coolant and the second coolant exchange heat in the main heat exchanger.

[0025] Preferably, the primary cooling circuit further comprises a main cooling pump, and the first coolant after flowing through the main heat exchanger enters the pre-cooling heat exchanger through the main cooling pump;

[0026] The first coolant and the second coolant exchange heat in the main coolant pump.

[0027] Preferably, the secondary cooling circuit includes a high-pressure side cooling circuit and a low-pressure side cooling circuit;

[0028] The second coolant in the high-pressure side cooling circuit exchanges heat with the first coolant in the primary cooling circuit, and the second coolant in the low-pressure side cooling circuit exchanges heat with the second coolant in the high-pressure side cooling circuit.

[0029] Preferably, the primary cooling circuit further comprises a melting tank, a charging and discharging tank, a first heater and a second heater;

[0030] The first heater is arranged on the melting tank, and the second heater is arranged on the filling and exhausting tank;

[0031] The melting tank is connected to the filling and exhausting tank, and the filling and exhausting tank is connected to the primary cooling circuit.

[0032] Preferably, the irradiation test system applicable to the lead-bismuth reactor further comprises an emergency cooling system;

[0033] The emergency cooling systems are provided in plurality, and the emergency cooling systems and the irradiation test subsystems are provided in one-to-one correspondence.

[0034] Preferably, the irradiation test system applicable to the lead-bismuth reactor further comprises a control system;

[0035] The emergency cooling systems are electrically connected or wirelessly connected to the control system respectively;

[0036] The control system is used to determine the target irradiation test subsystem based on the type of cooling medium, and is also used to control the emergency cooling system to cool the target irradiation test subsystem when the main cooling system fails.

[0037] The beneficial effects of the technical solution provided by the present invention include at least:

[0038] The present invention sets up a main cooling system and multiple irradiation test subsystems, and the types of cooling media in the multiple irradiation test subsystems are different. At least one irradiation test subsystem can be cooled by a main cooling system, and according to the needs of the test fuel assembly, the switching system can be used to switch to the required cooling medium environment, thereby reducing the construction cost of the test system, reducing the occupied space, and improving the utilization efficiency of the test system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a schematic diagram of the principle structure of an embodiment of the present invention;

[0041] Figure 2 The figure is a schematic diagram of the connection structure of each system according to an embodiment of the present invention.

[0042] The reference numerals in the figures represent respectively:

[0043] Irradiation test subsystem: 101-irradiation device; 102-preheating module; 103-main circulation pump; 104-fuel damage detection module; 105-coolant quality control module; 106-test heat exchanger;

[0044] Main Cooling System:

[0045] Primary cooling circuit: 201-precooling heat exchanger; 202-first main heat exchanger; 203-second main heat exchanger; 204-expansion tank; 205-first main cooling pump; 206-second main cooling pump; 207-melting tank; 208-charging and exhausting tank; 209-first heater; 210-second heater; V-2-01-first electric regulating valve; V-2-02-second electric regulating valve; V-2-03-first manual stop valve; V-2-04-second manual stop valve; V-2-05-third manual stop valve; V-2-06-fourth manual stop valve; V-2-07-first check valve; V-2-08-second check valve; V-2-09-fifth manual stop valve; V-2-10-third electric regulating valve; V-2-11-sixth manual stop valve;

[0046] Secondary cooling circuit: 301-first high-pressure cooling pump; 302-second high-pressure cooling pump; 303-secondary heat exchanger; 304-first low-pressure cooling pump; 305-second low-pressure cooling pump; V-3-01-third check valve; V-3-02-seventh manual stop valve; V-3-03-eighth manual stop valve; V-3-04-ninth manual stop valve; V-3-05-fourth check valve; V-3-06-fifth check valve; V-3-07-fourth electric regulating valve; V-3-08-sixth check valve; V-3-09-seventh check valve; V-3-10-fifth electric regulating valve; V-3-11-tenth manual stop valve; V-3-12-eleventh manual stop valve; V-3-13-sixth electric regulating valve; V-3-14-first electric stop valve; V-3-15-seventh electric regulating valve; V-3-16-second electric stop valve;

[0047] Emergency cooling system: 401-buffer tank; 402-first emergency cooling pump; 403-second emergency cooling pump; 404-coil heat exchanger; V-4-01-eighth check valve; V-4-02-ninth check valve; V-4-03-third electric stop valve; V-4-04-fourth electric stop valve; V-4-05-fifth electric stop valve.

[0048] The above drawings have shown a clear embodiment of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0051] At present, the cooling media corresponding to different reactor fuel types include LBE medium, Na medium, Pb medium, and helium medium. The design temperature of LBE medium is 500°C, the design temperature of Na medium is 550°C, the design temperature of Pb medium is 750°C, the design temperature of molten salt medium is 800°C, and the design temperature of helium medium is 950°C. To conduct irradiation tests on various types of reactor fuels, it is necessary to build multiple irradiation test circuits for different cooling media, which is very expensive and has low utilization rate. Therefore, this application proposes an irradiation test system suitable for lead-bismuth reactors.

[0052] like Figure 1 As shown, an irradiation test system suitable for a lead-bismuth reactor includes: a main cooling system, a switching system, and an irradiation test subsystem. A plurality of irradiation test subsystems are provided, and the types of cooling media in the plurality of irradiation test subsystems are different. The plurality of irradiation test subsystems are connected to the main cooling system through a switching system, and the main cooling system is used to cool the cooling medium in at least one irradiation test subsystem. The present application sets up a main cooling system and a plurality of irradiation test subsystems, and the types of cooling media in the plurality of irradiation test subsystems are different. At least one irradiation test subsystem can be cooled by a main cooling system, and the switching system can be used to switch to the required cooling medium environment according to the needs of the test fuel assembly, thereby reducing the construction cost of the test system, reducing the occupied space, and improving the utilization efficiency of the test system.

[0053] Specifically, in the present embodiment, four irradiation test subsystems are provided, the cooling medium in one irradiation test subsystem is LBE medium, and the main cooling system can cool the LBE medium in the reactor type fuel irradiation test; the cooling medium in one irradiation test subsystem is Na medium, and the main cooling system can cool the Na medium in the reactor type fuel irradiation test; the cooling medium in one irradiation test subsystem is Pb medium, and the main cooling system can cool the Pb medium in the reactor type fuel irradiation test; the cooling medium in one irradiation test subsystem is helium medium, and the main cooling system can cool the helium medium in the reactor type fuel irradiation test.

[0054] like Figure 1As shown, the switching system includes an inlet switching device and an outlet switching device. The inlet switching device is arranged at the inlet of the main cooling system, and the outlet switching device is arranged at the outlet of the main cooling system. The inlet switching device includes an inlet collector and a plurality of inlet collecting pipes. The plurality of inlet collecting pipes and the inlet collector can be connected in an on-off manner. The inlet collector is connected to the inlet of the main cooling system, and the inlet collecting pipes and the irradiation test subsystems are arranged in a one-to-one correspondence. The outlet switching device includes an outlet distributor and a plurality of outlet distribution pipes. The plurality of outlet distribution pipes and the outlet distributor can be connected in an on-off manner. The outlet distributor is connected to the outlet of the main cooling system, and the outlet distribution pipes and the irradiation test subsystems are arranged in a one-to-one correspondence. The outlet distribution pipe is used to send the coolant in the main cooling system into the target irradiation test subsystem, and the inlet collecting pipe is used to recover the coolant in the main cooling system that flows back from the target irradiation test subsystem.

[0055] Preferably, the irradiation test system for the lead-bismuth reactor also includes a control system, the switching system and the control system are electrically connected or wirelessly connected, and the control system is used to determine the target irradiation test subsystem based on the type of cooling medium, and control the switching system to connect the main cooling system and the target irradiation test subsystem. Specifically, the mapping relationship between the cooling medium type and the irradiation test subsystem is pre-set in the control system, and the user determines the cooling medium based on the requirements of the reactor type fuel irradiation test. The control system obtains the cooling medium type determined by the user, and determines the target irradiation test subsystem corresponding to the cooling medium type determined by the user based on the mapping relationship between the cooling medium and the irradiation test subsystem, and controls the switching system to connect the main cooling system and the target irradiation test subsystem. For example, the user determines that the cooling medium is Na medium based on the requirements of the reactor type fuel irradiation test, and the control system obtains the cooling medium type determined by the user as Na medium, and determines the target irradiation test subsystem corresponding to Na medium based on the mapping relationship between Na medium and the irradiation test subsystem, and controls the switching system to connect the main cooling system and the target irradiation test subsystem to start the irradiation test.

[0056] like Figure 2As shown, the irradiation test subsystem includes a test heat exchanger 106, an irradiation device 101, a preheating module 102, a main circulation pump 103, a coolant quality control module 105, and a fuel damage detection module 104. When the irradiation test subsystem is in operation, the cooling medium flows through the test fuel assembly in the irradiation device 101 driven by the main circulation pump 103, and removes the heat generated by the test fuel assembly in the stack through convection heat exchange. After flowing out of the outlet of the main circulation pump 103, the cooling medium flows through the preheating module 102, the irradiation device 101, and the test heat exchanger 106 in sequence and flows into the main circulation pump 103. The cooling medium is cooled down by the coolant in the main cooling system on the primary side of the test heat exchanger 106. A fuel damage detection module 104 and a coolant quality control module 105 are provided at the inlet of the main circulation pump 103. The fuel damage detection module 104 is used to monitor the damage of the test fuel assembly and reduce the risk of radioactive diffusion. The coolant quality control system is used to control the chemical quality of the cooling medium according to the chemical concentration limit requirements of the cooling medium and the operational safety requirements.

[0057] Considering that liquid metals such as LBE, Na, and Pb may condense at room temperature, a preheating module 102 is provided at the entrance of the irradiation device 101 to heat the cooling medium in order to prevent the cooling medium from clogging the pipeline and causing local overpressure or deterioration of local heat transfer of the test fuel assembly.

[0058] Specifically, Figure 2 As shown, the main cooling system includes a primary cooling circuit and a secondary cooling circuit. The primary cooling circuit is connected to the test heat exchanger 106 through a switching system, the primary cooling circuit and the test heat exchanger 106 perform heat exchange, and the secondary cooling circuit and the primary cooling circuit perform heat exchange. In this embodiment, a first coolant is set in the primary cooling circuit, and a second coolant is set in the secondary cooling circuit. The first coolant is a liquid metal LBE with a wide operating temperature range and a large heat carrying capacity, and the second coolant is water. The setting of the secondary cooling circuit and the primary cooling circuit improves the cooling efficiency of the radiation test subsystem.

[0059] Specifically, Figure 2 As shown, the primary cooling circuit includes a precooling heat exchanger 201 and a main heat exchanger. The first coolant flowing out of the test heat exchanger 106 flows through the precooling heat exchanger 201, the main heat exchanger, the precooling heat exchanger 201 in sequence, and flows into the test heat exchanger 106. The first coolant flowing out of the test heat exchanger 106 and the first refrigerant flowing into the test heat exchanger 106 enter heat exchange in the precooling heat exchanger 201. The first coolant and the second coolant perform heat exchange in the main heat exchanger. By providing the precooling heat exchanger 201, the temperature of the first coolant entering the main heat exchanger is reduced, and the temperature difference between the first coolant and the second coolant in the main heat exchanger is reduced to 150-200°C, which reduces the failure rate of the main heat exchanger and increases the service life of the main heat exchanger.

[0060] Preferably, the primary cooling circuit also includes a main cooling pump. The first coolant flowing through the main heat exchanger enters the pre-cooling heat exchanger 201 through the main cooling pump. The first coolant and the second coolant exchange heat in the main cooling pump. While further lowering the temperature of the first coolant, the failure rate of the main cooling pump is reduced and the service life of the main cooling pump is increased.

[0061] Specifically, Figure 2 As shown, the primary cooling circuit further includes an expansion tank 204, which is connected to the main heat exchanger and the main cooling pump. The expansion tank 204 is used to eliminate the pressure fluctuation of the liquid metal LBE caused by the temperature change.

[0062] Specifically, Figure 2 The main heat exchanger includes a first main heat exchanger 202 and a second main heat exchanger 203, and the first main heat exchanger 202 and the second main heat exchanger 203 are arranged in parallel. The first electric regulating valve V-2-01 is arranged in parallel with the first main heat exchanger 202 and the second main heat exchanger 203, and is used to adjust the flow of the first coolant flowing into the first main heat exchanger 202 and the second main heat exchanger 203. The fourth manual stop valve V-2-06 is arranged at the primary side inlet of the first main heat exchanger 202, the third manual stop valve V-2-05 is arranged at the primary side outlet of the first main heat exchanger 202, the sixth electric regulating valve V-3-13 is arranged at the secondary side inlet of the first main heat exchanger 202, and the first electric stop valve V-3-14 is arranged at the secondary side outlet of the first main heat exchanger 202. A second manual stop valve V-2-04 is provided at the primary side inlet of the second main heat exchanger 203, a first manual stop valve V-2-03 is provided at the primary side outlet of the second main heat exchanger 203, a seventh electric regulating valve V-3-15 is provided at the secondary side inlet of the second main heat exchanger 203, and a second electric stop valve V-3-16 is provided at the secondary side outlet of the first main heat exchanger 202. The heat exchange amount of the main heat exchanger can be adjusted by adjusting the opening of the first electric regulating valve V-2-01, the sixth electric regulating valve V-3-13, and the seventh electric regulating valve V-3-15, and the temperature of the first coolant in the main heat exchanger can be adjusted. The sixth electric regulating valve V-3-13, the first electric stop valve V-3-14, the seventh electric stop valve V-3-15, and the second electric stop valve V-3-16 can be set to prevent cooling water from being injected into the high-temperature lead-bismuth alloy to generate steam when the heat exchange tube is broken by closing the above valves.

[0063] Specifically, Figure 2As shown, the main cooling pump includes a first main cooling pump 205 and a second main cooling pump 206. The first check valve V-2-07 is provided at the primary outlet of the first main cooling pump 205, and the second check valve V-2-08 is provided at the primary outlet of the second main cooling pump 206. A bypass branch is provided at the outlet of the main cooling pump and the inlet of the main cooling pump. A second electric regulating valve V-2-02 is provided on the bypass branch. The second electric regulating valve V-2-02 is used to adjust the flow of the first coolant in the main cooling pump, thereby adjusting the flow of the main cooling system and the ability of the main cooling system to export heat. The outlet of the main cooling pump is connected to the precooling heat exchanger 201.

[0064] Specifically, Figure 2 As shown, the primary cooling circuit also includes a melting tank 207, a charging and discharging tank 208, a first heater 209 and a second heater 210. The first heater 209 is arranged on the melting tank 207, the second heater 210 is arranged on the charging and discharging tank 208, the melting tank 207 and the charging and discharging tank 208 are connected, and the charging and discharging tank 208 is connected to the primary cooling circuit. When the primary cooling circuit is filled with liquid, the lead ingot is placed in the melting tank 207, the first heater 209 heats the melting tank 207, and after the lead ingot is melted, the sixth manual stop valve V-2-11 is opened, and the liquid metal LBE after the lead ingot is melted flows into the charging and discharging tank 208, and the liquid metal LBE is heated to the operating temperature of the primary cooling circuit by the second heater 210 in the charging and discharging tank 208; when gas pressure is applied above the liquid surface of the charging and discharging tank 208, the charging and discharging tank 208 fills the primary cooling circuit with liquid. The connecting pipeline between the filling and discharging tank 208 and the primary cooling circuit is provided with a fifth manual stop valve V-2-09 and a third electric regulating valve V-2-10. The filling and discharging speed can be adjusted by adjusting the opening of the third electric regulating valve V-2-10.

[0065] like Figure 2 As shown, the secondary cooling circuit includes a high-pressure side cooling circuit and a low-pressure side cooling circuit; the second coolant in the high-pressure side cooling circuit exchanges heat with the first coolant in the primary cooling circuit, and the second coolant in the low-pressure side cooling circuit exchanges heat with the second coolant in the high-pressure side cooling circuit.

[0066] Specifically, Figure 2As shown, the design pressure of the high-pressure cooling circuit is 1.5MPa, the operating pressure is 1MPa, and the design temperature is 120℃. The design pressure of the low-pressure cooling circuit is 1MPa, and the design temperature is 100℃. The high-pressure cooling circuit provides a cold source for the first main heat exchanger 202, the second main heat exchanger 203, the first main cooling pump 205, and the second cooling pump 206. The heat exchanged from the primary cooling circuit by the high-pressure cooling circuit is exported to the environment by the low-pressure cooling circuit in the secondary heat exchanger 303. The high-pressure cooling circuit is in a closed state during operation. Before operation, the high-pressure cooling circuit is filled with water from the water inlet pipeline of the low-pressure cooling circuit. After filling with water, the seventh manual stop valve V-3-02 and the third check valve V-3-01 on the water filling pipeline between the high-pressure cooling circuit and the low-pressure cooling circuit isolate the high-pressure cooling circuit from the low-pressure cooling circuit to reduce the risk of radioactive diffusion.

[0067] Specifically, Figure 2 As shown, the high-pressure side cooling circuit includes a first high-pressure cooling pump 301 and a second high-pressure cooling pump 302. The cooling water in the driving circuit of the first high-pressure cooling pump 301 and the second high-pressure cooling pump 302 is divided into two branches. One branch enters the secondary side inlet of the first main heat exchanger 202 and the secondary side inlet of the second main heat exchanger 203 through the eleventh manual stop valve V-3-12, and the other branch enters the secondary side inlet of the first main cooling pump 205 and the secondary side inlet of the second main cooling pump 206 through the tenth manual stop valve V-3-11. The cooled cooling water is heated to about 100°C, and the cooling water in the high-pressure side cooling circuit is cooled down by the cooling water in the low-pressure side cooling circuit in the secondary heat exchanger 303, and returns to the inlet of the first high-pressure cooling pump 301 and the second high-pressure cooling pump 302 again. The outlet of the first high-pressure cooling pump 301 is provided with a seventh check valve V-3-09, and the outlet of the second high-pressure cooling pump 302 is provided with a sixth check valve V-3-08. The fifth electric regulating valve V-3-10 is arranged in parallel with the first high-pressure cooling pump 301 and the second high-pressure cooling pump 302, and is used to adjust the flow rate of cooling water in the first high-pressure side cooling circuit. It is also used as a bypass branch to facilitate the maintenance and replacement of the first high-pressure cooling pump 301 and the second high-pressure cooling pump 302.

[0068] The low-pressure side cooling circuit is an open circuit, which is provided with a pressure head by the first low-pressure cooling pump 304 and the second low-pressure cooling pump 305, and uses the secondary water outside the factory to export the heat in the high-pressure side cooling circuit to the environment in the secondary heat exchanger 303. The inlet of the first low-pressure cooling pump 304 is provided with an eighth manual stop valve V-3-03, the outlet of the first low-pressure cooling pump 304 is provided with a fourth check valve V-3-05, the inlet of the second low-pressure cooling pump 305 is provided with a ninth manual stop valve V-3-04, the outlet of the second low-pressure cooling pump 305 is provided with a fifth check valve V-3-06, and the fourth electric regulating valve V-3-07 is provided on a bypass branch connected in parallel with the first low-pressure cooling pump 304 and the second low-pressure cooling pump 305. The fourth electric regulating valve V-3-07 is provided on this bypass branch.

[0069] Preferably, Figure 1 As shown, the irradiation test system for the lead-bismuth reactor also includes an emergency cooling system. Multiple emergency cooling systems are provided, and the emergency cooling systems and irradiation test subsystems are provided one by one.

[0070] Specifically, Figure 2 As shown, the emergency cooling system includes a buffer tank 401, a first emergency cooling pump 402, a second emergency cooling pump 403 and a coil heat exchanger 404. The first emergency cooling pump 402 and the second emergency cooling pump 403 provide power, and the buffer tank 401 is connected to the coil heat exchanger 404. The cooling medium in the emergency cooling system is the same as the cooling medium in the corresponding irradiation test subsystem. The cooling medium flowing out of the outlet of the first emergency cooling pump 402 and the second emergency cooling pump 403 flows into the irradiation device 101 through the outlet pipeline of the preheating module 102 of the irradiation test subsystem to cool the test fuel assembly in the irradiation device 101. The cooling medium after heat exchange flows into the coil heat exchanger 404 and the buffer tank 401 in turn, and returns to the inlet of the first emergency cooling pump 402 and the second emergency cooling pump 403. When the main cooling system and irradiation test subsystem operate normally, the fourth electric stop valve V-4-04 is in the open state, the third electric stop valve V-4-03 and the fifth electric stop valve V-4-05 are in the closed state, and the cooling medium flows in the emergency cooling system; when the corresponding irradiation test system and / or the main cooling system fails and cannot release the heat of the test fuel assembly, the emergency cooling system opens the third electric stop valve V-4-03 and the fifth electric stop valve V-4-05, and closes the fourth electric stop valve V-4-04, and the emergency cooling system injects cooling medium into the corresponding irradiation test subsystem to provide emergency cooling for the test fuel assembly.

[0071] like Figure 2 As shown, an eighth check valve V-4-01 is provided at the outlet of the first emergency cooling pump 402 , and a ninth check valve V-4-02 is provided at the outlet of the second emergency cooling pump 403 .

[0072] The heat taken away from the test fuel assembly by the cooling medium in the emergency cooling system is cooled by the coil heat exchanger 404. The medium in the coil heat exchanger 404 that exchanges heat with the cooling medium in the emergency cooling system is liquid metal LBE.

[0073] Preferably, the plurality of emergency cooling systems are electrically connected or wirelessly connected to the control system. The control system is used to determine the target irradiation test subsystem based on the type of cooling medium, and is also used to control the emergency cooling system to cool the target irradiation test subsystem when the main cooling system fails.

[0074] The irradiation test system of the present application can be used to implement steady-state irradiation tests of fuels with a variety of different cooling media on a lead-bismuth reactor.

[0075] The present application sets up a switching system and multiple irradiation test subsystems. The switching system can be used to switch to the required cooling medium environment according to the needs of the test fuel assembly. The irradiation test subsystem exports the heat of the test fuel assembly to the main cooling system through the test heat exchanger 106. The irradiation test subsystem sets up a coolant quality control module 105 for controlling the chemical quality of the coolant. Fuel damage can be monitored through the fuel damage detection module 104.

[0076] The main cooling system of the present application uses liquid metal LBE with a wide operating range and inactive chemical properties as the first coolant. The flow rate, operating temperature and heat exchange power of the main cooling system can be adjusted to meet the different heat exchange requirements of the irradiation test subsystem.

[0077] The emergency cooling system of the present application injects low-temperature cooling medium into the irradiation test subsystem to provide emergency cooling for the test fuel assembly under accident conditions. The cooling medium is cooled by the reactor liquid metal LBE in a coil heat exchanger placed in the reactor cooling medium.

[0078] The secondary cooling system of the present invention provides cooling for the main cooling system heat exchanger and pump by setting high pressure area and low pressure area. The water in the high pressure area directly cools the main cooling system equipment, and the water in the low pressure area leads the secondary water in the high pressure area to the environment in the secondary cooling system heat exchanger.

[0079] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0080] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only.

[0081] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An irradiation test system suitable for a lead-bismuth reactor, characterized in that: include: Main cooling system, switching system and irradiation test subsystem; The irradiation test subsystems are provided in plurality, and the types of cooling media in the plurality of irradiation test subsystems are different; A plurality of the irradiation test subsystems are connected to the main cooling system via the switching system, and the main cooling system is used to cool the cooling medium in at least one of the irradiation test subsystems.

2. The irradiation test system for lead-bismuth reactor according to claim 1, characterized in that: The switching system includes an inlet switching device and an outlet switching device; The inlet switching device is arranged at the inlet of the main cooling system, and the outlet switching device is arranged at the outlet of the main cooling system; The inlet switching device includes an inlet collector and a plurality of inlet collecting pipes, the plurality of inlet collecting pipes and the inlet collector can be connected in an on-off manner, the inlet collector is connected to the inlet of the main cooling system, and the inlet collecting pipes and the irradiation test subsystem are arranged in a one-to-one correspondence; The outlet switching device includes an outlet distributor and a plurality of outlet distribution pipes, the plurality of outlet distribution pipes and the outlet distributor can be connected in an on-off manner, the outlet distributor is connected to the outlet of the main cooling system, and the outlet distribution pipes and the irradiation test subsystems are arranged in a one-to-one correspondence; The outlet distribution pipe is used to deliver the coolant in the main cooling system into the target irradiation test subsystem, and the inlet collecting pipe is used to recover the coolant in the main cooling system that flows back from the target irradiation test subsystem.

3. The irradiation test system for lead-bismuth reactor according to claim 1, characterized in that: The irradiation test system applicable to the lead-bismuth reactor also includes a control system; The switching system and the control system are electrically connected or wirelessly connected in communication; The control system is used to determine the target irradiation test subsystem based on the type of cooling medium, and control the switching system to connect the main cooling system and the target irradiation test subsystem.

4. The irradiation test system for lead-bismuth reactor according to claim 1, characterized in that: The irradiation test subsystem includes a test heat exchanger; The main cooling system includes a primary cooling circuit and a secondary cooling circuit; The primary cooling circuit is connected to the test heat exchanger through the switching system, the primary cooling circuit and the test heat exchanger perform heat exchange, and the secondary cooling circuit and the primary cooling circuit perform heat exchange.

5. The irradiation test system for lead-bismuth reactor according to claim 4, characterized in that: The primary cooling circuit includes a precooling heat exchanger and a main heat exchanger; A first coolant is arranged in the primary cooling circuit, and a second coolant is arranged in the secondary cooling circuit; The first coolant flowing out of the test heat exchanger flows through the precooling heat exchanger, the main heat exchanger, and the precooling heat exchanger in sequence, and flows into the test heat exchanger. The first coolant flowing out of the test heat exchanger and the first refrigerant flowing into the test heat exchanger enter heat exchange in the precooling heat exchanger. The first coolant and the second coolant exchange heat in the main heat exchanger.

6. The irradiation test system for lead-bismuth reactor according to claim 5, characterized in that: The primary cooling circuit further includes a main cooling pump, and the first coolant after flowing through the main heat exchanger enters the pre-cooling heat exchanger through the main cooling pump; The first coolant and the second coolant exchange heat in the main coolant pump.

7. The irradiation test system for lead-bismuth reactor according to claim 5, characterized in that: The secondary cooling circuit includes a high-pressure side cooling circuit and a low-pressure side cooling circuit; The second coolant in the high-pressure side cooling circuit exchanges heat with the first coolant in the primary cooling circuit, and the second coolant in the low-pressure side cooling circuit exchanges heat with the second coolant in the high-pressure side cooling circuit.

8. The irradiation test system for lead-bismuth reactor according to claim 4, characterized in that: The primary cooling circuit also includes a melting tank, a charging and discharging tank, a first heater and a second heater; The first heater is arranged on the melting tank, and the second heater is arranged on the filling and exhausting tank; The melting tank is connected to the filling and exhausting tank, and the filling and exhausting tank is connected to the primary cooling circuit.

9. The irradiation test system for lead-bismuth reactor according to claim 1, characterized in that: The irradiation test system applicable to the lead-bismuth reactor also includes an emergency cooling system; The emergency cooling systems are provided in plurality, and the emergency cooling systems and the irradiation test subsystems are provided in one-to-one correspondence.

10. The irradiation test system for lead-bismuth reactor according to claim 9, characterized in that: The irradiation test system applicable to the lead-bismuth reactor also includes a control system; The emergency cooling systems are electrically connected or wirelessly connected to the control system respectively; The control system is used to determine the target irradiation test subsystem based on the type of cooling medium, and is also used to control the emergency cooling system to cool the target irradiation test subsystem when the main cooling system fails.

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