A fast reactor material irradiation test component

Abstract

The embodiment of the present application provides a fast reactor material irradiation test assembly, including: an assembly body, a monitoring rod and an irradiation rod, the assembly body having a storage space and a coolant inlet hole and a coolant outlet hole connected to the storage space, the monitoring rod being placed in a monitoring device in the monitoring rod, the monitoring rod being detachably arranged in the storage space, the irradiation rod including an irradiation tank having a storage cavity and a sample tank placed in the storage cavity, the irradiation rod being detachably arranged in the storage space and located on the peripheral side of the monitoring rod. The fast reactor material irradiation test assembly of the embodiment of the present application has good applicability.

Description

Technical Field

[0001] The invention relates to the field of reactor engineering technology, and in particular to a fast reactor material irradiation test component. Background Art

[0002] The sodium-cooled fast reactor (hereinafter referred to as "fast reactor") is one of the reactor types currently at the forefront of nuclear industry research. Compared with existing thermal reactors, the neutron field energy inside the fast reactor core is higher. This feature can be used to conduct relevant research on the irradiation performance of materials under fast neutron fields.

[0003] To ensure the irradiation of test materials in fast reactors, without affecting or affecting the physical, thermal and other parameters of the reactor core within an acceptable range, structural changes and material replacements are made inside the fast reactor components to monitor parameters such as temperature and neutron injection during material irradiation, obtain irradiation performance data of irradiated materials in the reactor, and ensure that the components can carry out corresponding scientific research while meeting the normal functions of the core. It is necessary to design fast reactor material irradiation test components to realize the irradiation of irradiated materials in fast reactors. This is also an indispensable research and development link for some new nuclear fuels, nuclear materials, and component design.

[0004] However, due to the insufficient development of fast reactors compared with thermal reactors, there is little experience in stable operation and irradiation testing of existing fast reactors. When implementing material irradiation testing in fast reactors, the entire irradiation test device needs to be repeatedly designed, developed and manufactured, resulting in a long R&D cycle, many uncertain factors, and low applicability of the device, which affects the allocation of scientific researchers and scientific research resources. Summary of the invention

[0005] In view of this, the main purpose of the embodiments of the present application is to provide a fast reactor material irradiation test assembly with wider applicability.

[0006] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0007] The embodiment of the present application provides a fast reactor material irradiation test assembly, including:

[0008] A component body, the component body having a receiving space and a coolant inlet hole and a coolant outlet hole communicated with the receiving space;

[0009] A monitoring rod, the monitoring rod comprising a monitoring device placed inside the monitoring rod, and the monitoring rod is detachably arranged in the accommodation space;

[0010] The irradiation rod comprises an irradiation tank having a receiving cavity and a sample tank placed in the receiving cavity. The irradiation rod is detachably arranged in the receiving space and is located on the peripheral side of the monitoring rod.

[0011] In one embodiment, the component body includes an operating head, an upper transition joint, an outer sleeve, a lower transition joint, a pin and a pin joint connected in sequence, and the accommodating space is formed in the outer sleeve.

[0012] In one embodiment, it is characterized in that the coolant inlet hole is arranged on the pin, and the coolant outlet hole is arranged on the operating head.

[0013] In one embodiment, it is characterized in that the component body also includes an upper shielding rod, an upper positioning grid, a lower shielding rod and a lower positioning grid located in the outer sleeve, the upper positioning grid and the lower positioning grid are spaced apart along the axial direction of the outer sleeve so that the accommodating space is formed at the interval, one end of the upper shielding rod is connected to the upper transition joint, the other end of the upper shielding rod is connected to the upper positioning grid, one end of the lower shielding rod is connected to the lower transition joint, and the other end of the lower shielding rod is spaced apart from the lower positioning grid.

[0014] In one embodiment, it is characterized in that the irradiation rod includes a first connecting member, a second connecting member and the irradiation tank, the first connecting member is connected to the upper end of the irradiation tank, the second connecting member is connected to the lower end of the irradiation tank, the first connecting member is connected to the upper positioning grid, and the second connecting member is connected to the lower positioning grid.

[0015] In one embodiment, it is characterized in that the monitoring rod includes a third connecting member, a fourth connecting member and a monitoring tank having a accommodating groove, the third connecting member is connected to the upper end of the monitoring tank, the fourth connecting member is connected to the lower end of the monitoring tank, the third connecting member is connected to the upper positioning grid, and the fourth connecting member is connected to the lower positioning grid.

[0016] In one embodiment, it is characterized in that the monitoring rod has a first cooling hole, and the first cooling hole is connected to the containing groove.

[0017] In one embodiment, it is characterized in that the irradiation rod has a second cooling hole, and the second cooling hole is connected to the accommodating cavity.

[0018] In one embodiment, it is characterized in that the irradiation tank can be designed to be closed, and the containing cavity between the inside of the irradiation tank and the sample tank can be filled with inert gas.

[0019] In one embodiment, it is characterized in that each of the irradiation rods and the monitoring rods has a laser engraved mark with a different number, and different circumferential surfaces of the operating head have the laser engraved marks with numbers corresponding to the axial irradiation rods and the monitoring rods one by one.

[0020] In one embodiment, it is characterized in that the outer surface of the tube pin has a sealing groove, and the component body also includes a coil spring, and the coil spring is engaged with the sealing groove to reduce coolant bypass when the tube pin is inserted into the fast reactor core.

[0021] In one embodiment, it is characterized in that the monitoring rod further comprises a wire winding around the outer surface of the monitoring rod, and the wire winding contacts the outer surface of the irradiation rod to radially fix the irradiation rod and the monitoring rod.

[0022] In one embodiment, it is characterized in that a temperature measuring device is also provided in the monitoring rod, and the monitoring device and the temperature measuring device are non-online monitoring devices; or, the monitoring device and the temperature measuring device are online monitoring devices.

[0023] In one embodiment, it is characterized in that there are multiple irradiation rods, and the multiple irradiation rods are arranged around the monitoring rod.

[0024] In one embodiment, it is characterized in that the irradiation tank includes at least one sample tank, and the sample tank is detachably placed in the containing cavity.

[0025] In one embodiment, the fast reactor material irradiation test assembly is applicable to any one of a sodium-cooled experimental fast reactor reflector region, a sodium-cooled demonstration fast reactor reflector region, and a sodium-cooled commercial fast reactor reflector region.

[0026] The embodiment of the present application provides a fast reactor material irradiation test assembly, which includes an assembly body, a monitoring rod and an irradiation rod, wherein the monitoring rod includes a monitoring device placed in the monitoring rod, and the irradiation rod includes an irradiation tank having a receiving cavity and a sample tank placed in the receiving cavity, that is, the receiving cavity of the irradiation tank is used to place the sample tank, the material sample is placed in the sample tank, and the monitoring rod is used to place the monitoring device. In addition, the assembly body has a receiving space and a coolant inlet hole and a coolant outlet hole connected to the receiving space, the monitoring rod is detachably arranged in the receiving space, and the irradiation rod is detachably arranged in the receiving space and is located on the peripheral side of the monitoring rod. Therefore, for different material samples that need to be irradiated in a fast reactor, it is only necessary to replace the material sample placed in the irradiation rod, and the monitoring device in the monitoring rod can complete the monitoring of various properties of the material sample. The fast reactor material irradiation test assembly can be reused, thereby improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a fast reactor material irradiation test assembly according to an embodiment of the present application;

[0028] Figure 2 for Figure 1 The aa-direction cross-sectional view shown in ;

[0029] Figure 3 for Figure 1 A schematic diagram of the structure of the monitoring rod shown in;

[0030] Figure 4 for Figure 1 The schematic diagram of the structure of the irradiation rod shown in;

[0031] Figure 5 Schematic diagram of the structure of the irradiation tank with a sample tank.

[0032] Description of Reference Numerals

[0033] Fast reactor material irradiation test assembly 10; assembly body 11; accommodating space 11a; coolant inlet hole 11b; coolant outlet hole 11c; operating head 110; upper transition joint 111; outer sleeve 112; lower transition joint 113; pin 114; pin joint 115; upper shielding rod 116; upper positioning grid 117; lower shielding rod 118; lower positioning grid 119; monitoring rod 12; first cooling hole 12a; third connecting piece 121; fourth connecting piece 122; monitoring tank 123; wire winding 124; irradiation rod 13; second cooling hole 13a; first connecting piece 131; second connecting piece 132; irradiation tank 133; sample tank 1331. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0035] In this application, the "axial", "upper", "lower" orientation or position relationship is based on the attached Figure 1 It should be understood that these directional terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0036] An embodiment of the present application provides a fast reactor material irradiation test assembly 10, see Figures 1 to 4The fast reactor material irradiation test assembly 10 includes an assembly body 11, a monitoring rod 12 and an irradiation rod 13. The monitoring rod 12 includes a monitoring device placed in the monitoring rod 12. The irradiation rod 13 includes an irradiation tank 133 having a receiving cavity and a sample tank 1331 placed in the receiving cavity. That is, the receiving cavity of the irradiation tank 133 is used to place the sample tank 1331, the interior of the sample tank 1331 is used to place the material sample, and the monitoring rod 12 is used to place the monitoring device. In addition, the assembly body 11 has a receiving space 11a and a coolant inlet hole 11b and a coolant outlet hole 11c connected to the receiving space 11a. The coolant can enter from the coolant inlet hole 11b, flow through the receiving space 11a, and then flow out from the coolant outlet to take away the heat caused by neutron irradiation in the fast reactor material irradiation test assembly 10. The monitoring rod 12 is detachably arranged in the receiving space 11a, and the irradiation rod 13 is detachably arranged in the receiving space 11a and located on the peripheral side of the monitoring rod 12. Therefore, for different material samples that need to be irradiated in a fast reactor, it is only necessary to replace the material sample placed in the sample tank 1331, and the monitoring device in the monitoring rod 12 can complete the monitoring of various properties of the material sample. The fast reactor material irradiation test assembly 10 can be reused, thereby improving the applicability of the device.

[0037] In addition, for material samples with greatly different structural forms and / or experimental requirements, it is only necessary to adjust the style of the irradiation rods 13 in the fast reactor material irradiation test assembly and / or replace the corresponding monitoring rods 12 to implement the irradiation work in the reactor, without having to repeat the design work of the entire assembly and the core physics and thermal analysis.

[0038] It should be noted that placing the monitoring device in the monitoring rod 12 means that the monitoring device can be taken out of the monitoring rod 12 . When the monitoring device is placed in the monitoring rod 12 , the monitoring device can be detachably connected to the monitoring rod 12 or not connected to the monitoring rod 12 .

[0039] In one embodiment, the fast reactor material irradiation test assembly 10 can be used for in-pile material irradiation testing, out-pile hydraulic performance testing, and off-line monitoring irradiation testing in the reflector area of ​​a sodium-cooled experimental fast reactor, a sodium-cooled demonstration fast reactor, or a sodium-cooled commercial fast reactor.

[0040] In one embodiment, there are multiple irradiation rods 13 , and the multiple irradiation rods 13 are arranged around the monitoring rod 12 .

[0041] In one embodiment, according to the material sample and research requirements, the number of the irradiation rod 13 and the monitoring rod 12 can be one or more.

[0042] In a specific embodiment, please refer to Figure 2 , the number of irradiation rods 13 is 6, and the number of monitoring rods 12 is 1.

[0043] In one embodiment, a temperature measuring device is also provided in the monitoring rod 12 to realize the temperature function. The monitoring device and the temperature measuring device can be online monitoring devices, or they can be non-online monitoring devices. For the non-online monitoring device, after the irradiation test is completed, the monitoring rod 12 can be disassembled in the hot chamber, and the non-online monitoring device can be taken out. According to the state and change of the non-online monitoring device, the neutron injection rate and the temperature range can be reversely deduced, which is convenient for the data analysis after the test, and can realize the non-online monitoring of the neutron injection rate and temperature of the core where the material sample is located. Different non-online monitoring devices can be placed in the monitoring rod 12 to monitor various parameters of the material sample during the irradiation test, providing a theoretical analysis basis for the post-irradiation inspection work.

[0044] In one embodiment, please refer to Figure 1 The component body 11 includes an operating head 110, an upper transition joint 111, an outer sleeve 112, a lower transition joint 113, a pin 114 and a pin joint 115 which are connected in sequence. An accommodating space 11a is formed in the outer sleeve 112, which can provide a basic device design form for material irradiation testing work in a fast reactor, and can match the thermal-hydraulic conditions of the corresponding position of the core according to the position of the reflector layer where the device is located, and is compatible with the existing reactor core design.

[0045] In a specific embodiment, the fast reactor material irradiation test assembly 10 is located in the reflector region in the core, and the position of the assembly in this region is less affected by the reactor shutdown and refueling, so that a long-term irradiation test can be achieved without the need to replace the assembly region. According to the test requirements, the fast reactor material irradiation test assembly 10 can be moved to the reflector region where the hydraulic conditions match, thereby achieving the control requirements for the neutron injection rate of the material irradiation test.

[0046] In a specific embodiment, the operating head 110 and the upper transition joint 111 can be connected by threads, and the two can be opened with holes to insert positioning pins and fixedly connected by spot welding.

[0047] In a specific embodiment, the outer sleeve 112 may be a hexagonal tube, and the lower transition joint 113 may be a spherical transition joint. The outer sleeve 112 is fixed to the upper transition joint 111 and the lower transition joint 113 by ring welding after being butted against each other.

[0048] In a specific embodiment, the lower transition joint 113 is threadedly connected to the tube pin 114, and the two are fixed by ring welding after being butted.

[0049] In a specific embodiment, the pin connector 115 is threadedly connected to the pin 114 and fixed by intermittent fillet welding.

[0050] In a specific embodiment, the fast reactor material irradiation test assembly 10 has the same appearance and similar weight as the reflector assembly to be replaced. It is arranged in the reflector area of ​​the core, and does not affect the neutron flux distribution of the core while matching the thermal and hydraulic performance of the core, which is beneficial to eliminate the impact of replacing the reflector assembly on the core. When the test assembly is put into the reactor, there is no need to perform core safety analysis work separately.

[0051] In one embodiment, please refer to Figure 1 The coolant inlet hole 11b is arranged on the pin 114, and the coolant outlet hole 11c is arranged on the operating head 110. In other words, the coolant flows from the lower part of the device to the upper part of the device, and can cool down various structures of the device.

[0052] It should be noted that for sodium-cooled fast reactors, liquid metallic sodium is used as the coolant.

[0053] In one embodiment, please refer to Figure 1 The assembly body 11 also includes an upper shielding rod 116, an upper positioning grid plate 117, a lower shielding rod 118 and a lower positioning grid plate 119 located in the outer sleeve 112. The upper positioning grid plate 117 and the lower positioning grid plate 119 are spaced apart along the axial direction of the outer sleeve 112 so that a receiving space 11a is formed at the spaced apart position. That is, the irradiation rod 13 and the monitoring rod 12 are placed between the upper positioning grid plate 117 and the lower positioning grid plate 119. One end of the upper shielding rod 116 is connected to the upper transition joint 111, and the other end of the upper shielding rod 116 is connected to the upper positioning grid plate 117. One end of the lower shielding rod 118 is connected to the lower transition joint 113, and the other end of the lower shielding rod 118 is spaced apart from the lower positioning grid plate 119. The upper shielding rod 116, the monitoring rod 12, the irradiation rod 13 and the lower shielding rod 118 can play a role in reducing the neutron leakage rate while slowing down the neutrons in the experimental fast reactor.

[0054] In a specific embodiment, the upper transition joint 111 is threadedly connected to the upper shielding rod 116 and fixed by spot welding.

[0055] In a specific embodiment, the upper shielding rod 116 and the upper positioning grid plate 117 are fixed by ring welding after being butted against each other.

[0056] In a specific embodiment, the lower shielding rod 118 and the lower transition joint 113 are fixed by inserting positioning pins at the openings and spot welding.

[0057] In one embodiment, please refer to Figure 4The irradiation rod 13 includes a first connecting member 131, a second connecting member 132 and an irradiation tank 133. The first connecting member 131 is connected to the upper end of the irradiation tank 133, and the second connecting member 132 is connected to the lower end of the irradiation tank 133. The first connecting member 131 is connected to the upper positioning grid 117, and the second connecting member 132 is connected to the lower positioning grid 119. That is to say, the irradiation tank 133 is located in the middle section of the irradiation rod 13, and its external maximum outer diameter is the same as that of the irradiation rod 13.

[0058] In one embodiment, after the material irradiation test is completed, the irradiation rod 13, the irradiation tank 133 and the sample tank 1331 can be disassembled in the hot chamber, and the material samples can be taken out to carry out post-irradiation testing.

[0059] In one embodiment, the irradiation tank 133 further includes at least one sample tank 1331, which can be detachably placed in the containing cavity, and the material sample can be placed in the sample tank 1331. According to the need to control the temperature and neutron injection rate of the sample tank 1331, the tank body can be designed as an open-pore structure to guide the coolant in the assembly to cool the sample tank 1331, or the tank body can be designed as a closed-pore structure, and the gap between the sample tank 1331 and the material sample is filled with inert gas to control the irradiation temperature of the sample tank 1331. In the fast reactor material irradiation test assembly 10, different sample tanks 1331 can hold different material samples, and the sample tank 1331 can test multiple materials at the same time according to the material irradiation test. The sample irradiation temperature can be controlled by the gap between the sample tank 1331 and the sample, that is, the material irradiation test requirements of multiple samples and multiple temperature gradients can be met.

[0060] In a specific embodiment, the first connecting member 131 , the irradiation rod 13 and the second connecting member 132 are fixed by ring welding.

[0061] In a specific embodiment, various material samples can be placed in the sample tank 1331 according to the requirements of the irradiation test.

[0062] In one embodiment, the upper positioning grid plate 117 and the lower positioning grid plate 119 are provided with grid holes, and both ends of the irradiation rod 13 are respectively inserted into the grid holes, connected by nuts, and fixed with washers by ring welding.

[0063] In one embodiment, please refer to Figure 3The monitoring rod 12 includes a third connecting member 121, a fourth connecting member 122 and a monitoring tank 123 having a receiving groove, that is, the monitoring device is placed in the receiving groove in the monitoring tank 123, the third connecting member 121 is connected to the upper end of the monitoring tank 123, the fourth connecting member 122 is connected to the lower end of the monitoring tank 123, the third connecting member 121 is connected to the upper positioning grid 117, and the fourth connecting member 122 is connected to the lower positioning grid 119, that is, the monitoring tank 123 is located in the middle section of the monitoring rod 12, and its maximum outer diameter is the same as that of the monitoring rod 12. The monitoring tank 123 can be designed at different positions in the middle section of the monitoring rod 12 according to the position to be monitored and the position of the sample in the sample tank 1331, so as to monitor the neutron injection rate and temperature of the sample.

[0064] In a specific embodiment, the third connecting member 121, the monitoring tank 123 and the fourth connecting member 122 are fixed by ring welding.

[0065] In a specific embodiment, the upper positioning grid plate 117 and the lower positioning grid plate 119 are provided with grid holes, and both ends of the monitoring rod 12 are respectively inserted into the grid holes, connected by nuts, and fixed with washers and ring welding.

[0066] In one embodiment, the monitoring rod 12 has a first cooling hole 12a, and the first cooling hole 12a is connected to the receiving groove. In other words, the first cooling hole 12a can be provided on the monitoring rod 12, so that the coolant in the receiving space 11a flows into the receiving groove, so that the coolant can cool the monitoring device, and the monitoring device can also directly measure the coolant temperature.

[0067] In one embodiment, the irradiation rod 13 has a second cooling hole 13a, which is connected to the accommodating cavity. In other words, the irradiation rod 13 can be provided with a second cooling hole 13a, so that the coolant in the accommodating space 11a flows into the accommodating cavity to directly cool the sample tank 1331.

[0068] In one embodiment, the irradiation tank 133 can be designed to be closed, and the accommodating cavity between the irradiation tank 133 and the sample tank 1331 can be filled with an inert gas. It should be noted that after the sample tank 1331 is placed in the accommodating cavity in the irradiation tank 133, there is still a gap in the accommodating cavity, and the inert gas can be filled into the gap to form a stable irradiation environment. At this time, the irradiation tank 133 does not have the second cooling hole 13a.

[0069] In a specific embodiment, the gap formed after the sample tank 1331 is placed in the containing cavity in the irradiation tank 133 can adjust the size of the gap according to actual needs to control the neutron injection rate and irradiation temperature received by the irradiated sample.

[0070] In one embodiment, the irradiation rod 13 and the monitoring rod 12 are respectively provided with laser markings with different numbers, and the different circumferential surfaces of the operation head 110 are provided with laser markings with numbers corresponding to the axial irradiation rods 13 and monitoring rods 12. That is to say, each irradiation rod 13 and monitoring rod 12 is provided with a laser marking with different numbers, and the surface of the operation head 110 corresponding to the upper part of each irradiation rod 13 and monitoring rod 12 is provided with a laser marking with the same number, so that when the fast reactor material irradiation test assembly 10 is placed in the core sodium pool, the fast reactor material irradiation test assembly 10 is rotated by grabbing the operation head 110 by the material changer, and the corresponding position of the corresponding numbered irradiation rod is indicated by the laser marking symbol on the operation head 110, so as to achieve the purpose of controlling the neutron injection rate received by the irradiated material, and at the same time avoid the problem of the need to replace the entire device due to the neutron injection rate requirements received by different material samples.

[0071] In one embodiment, the outer surface of the tube pin 114 has a sealing groove, and the component body 11 also includes a coil spring, which is engaged with the sealing groove to reduce coolant bypass when the tube pin 114 is inserted into the fast reactor core.

[0072] In one embodiment, please refer to Figure 3 The monitoring rod 12 also includes a wire wrap 124 wound around the outer surface of the monitoring rod 12 . The wire wrap 124 contacts the outer surface of the irradiation rod 13 , so as to realize radial positioning and fixation between the monitoring rod 12 and the irradiation rod 13 .

[0073] In a specific embodiment, two ends of the winding wire 124 are welded and fixed on the monitoring rod 12 .

[0074] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fast reactor material irradiation test assembly, characterized in that: include: A component body, the component body having a receiving space and a coolant inlet hole and a coolant outlet hole communicated with the receiving space, the component body comprising an operating head, an upper transition joint, an outer sleeve, a lower transition joint, a pin and a pin joint connected in sequence, and the receiving space is formed in the outer sleeve; A monitoring rod, the monitoring rod comprising a monitoring device placed inside the monitoring rod, and the monitoring rod is detachably arranged in the accommodation space; An irradiation rod, the irradiation rod comprising an irradiation tank having a receiving cavity and a sample tank placed in the receiving cavity, the irradiation rod being detachably arranged in the receiving space and being located on the peripheral side of the monitoring rod, and the monitoring device being used to monitor the performance of the material sample in the sample tank; Each of the irradiation rods and the monitoring rods has a laser engraved mark with a different number, and different circumferential surfaces of the operating head have the laser engraved marks with numbers corresponding to the axial irradiation rods and the monitoring rods one by one; the irradiation rod has a second cooling hole, and the second cooling hole is connected to the accommodating cavity.

2. The fast reactor material irradiation test assembly according to claim 1, characterized in that: The coolant inlet hole is arranged on the pin, and the coolant outlet hole is arranged on the operating head.

3. The fast reactor material irradiation test assembly according to claim 1, characterized in that: The component body also includes an upper shielding rod, an upper positioning grid, a lower shielding rod and a lower positioning grid located in the outer sleeve. The upper positioning grid and the lower positioning grid are spaced apart along the axial direction of the outer sleeve so that the accommodating space is formed at the interval. One end of the upper shielding rod is connected to the upper transition joint, and the other end of the upper shielding rod is connected to the upper positioning grid. One end of the lower shielding rod is connected to the lower transition joint, and the other end of the lower shielding rod is spaced apart from the lower positioning grid.

4. The fast reactor material irradiation test assembly according to claim 3, characterized in that: The irradiation rod includes a first connecting member, a second connecting member and the irradiation tank, the first connecting member is connected to the upper end of the irradiation tank, the second connecting member is connected to the lower end of the irradiation tank, the first connecting member is connected to the upper positioning grid, and the second connecting member is connected to the lower positioning grid.

5. The fast reactor material irradiation test assembly according to claim 3, characterized in that: The monitoring rod includes a third connecting member, a fourth connecting member and a monitoring tank with a accommodating groove, the third connecting member is connected to the upper end of the monitoring tank, the fourth connecting member is connected to the lower end of the monitoring tank, the third connecting member is connected to the upper positioning grid, and the fourth connecting member is connected to the lower positioning grid.

6. The fast reactor material irradiation test assembly according to claim 5, characterized in that: The monitoring rod has a first cooling hole, and the first cooling hole is communicated with the containing groove.

7. The fast reactor material irradiation test assembly according to claim 1, characterized in that: The irradiation tank may be designed to be closed, and the containing cavity between the inside of the irradiation tank and the sample tank may be filled with inert gas.

8. The fast reactor material irradiation test assembly according to claim 1, characterized in that: The outer surface of the tube pin is provided with a sealing groove, and the component body further comprises a coil spring, which is engaged with the sealing groove to reduce coolant bypass when the tube pin is inserted into the fast reactor core.

9. The fast reactor material irradiation test assembly according to claim 1, characterized in that: The monitoring rod further includes a wire winding wound on an outer surface of the monitoring rod, wherein the wire winding contacts an outer surface of the irradiation rod to radially fix the irradiation rod and the monitoring rod.

10. The fast reactor material irradiation test assembly according to claim 1, characterized in that: A temperature measuring device is also provided in the monitoring rod, and the monitoring device and the temperature measuring device are off-line monitoring devices; or, the monitoring device and the temperature measuring device are online monitoring devices.

11. The fast reactor material irradiation test assembly according to claim 1, characterized in that: There are multiple irradiation rods, and the multiple irradiation rods are arranged around the monitoring rod.

12. The fast reactor material irradiation test assembly according to claim 1, characterized in that: The irradiation tank includes at least one sample tank, and the sample tank is detachably placed in the containing cavity.

13. The fast reactor material irradiation test assembly according to any one of claims 1 to 12, characterized in that: The fast reactor material irradiation test assembly is applicable to any one of a sodium-cooled experimental fast reactor reflector region, a sodium-cooled demonstration fast reactor reflector region and a sodium-cooled commercial fast reactor reflector region.

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