CN216084347U - Irradiation target for producing carbon-14 nuclide by pressurized water reactor nuclear power station - Google Patents
Irradiation target for producing carbon-14 nuclide by pressurized water reactor nuclear power station Download PDFInfo
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- CN216084347U CN216084347U CN202120911005.5U CN202120911005U CN216084347U CN 216084347 U CN216084347 U CN 216084347U CN 202120911005 U CN202120911005 U CN 202120911005U CN 216084347 U CN216084347 U CN 216084347U
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Abstract
The utility model belongs to the technical field of fuel assemblies and related assemblies, and particularly discloses an irradiation target for producing carbon-14 nuclide in a pressurized water reactor nuclear power station, which comprises a star frame and a plurality of beam target rods, wherein the tops of the beam target rods are arranged in the star frame; the star frame consists of a plurality of groups of triangular structure frames, the groups of triangular structure frames are uniformly distributed along the circumferential direction of the star frame, a plurality of beam targets are arranged in each group of triangular structures, and the star frame also comprises a supporting boss positioned in the center of the groups of triangular structure frames and a hoisting structure positioned in the top of the supporting boss; the target rod is of an inner-outer double-layer cladding structure, the outer layer is an integrated outer cladding tube, and the inner layer is a plurality of inner target boxes which are positioned in the outer cladding tube and are filled with AlN target materials or hollow. The irradiation target can receive safe, reliable and efficient irradiation in a reactor, has better structural strength, meets the core requirement of producing carbon-14 nuclide by irradiation of commercial operating pressure water reactors, and does not influence the safe operation of a nuclear power unit.
Description
Technical Field
The utility model belongs to the technical field of fuel assemblies and related assemblies, and particularly relates to a method for producing a carbon-14 nuclide irradiation target in a pressurized water reactor nuclear power station.
Background
Carbon-14 (C)14C) Is a radioactive isotope of carbon element, is widely applied to the fields of medical treatment and biological medicine such as breath detection, compound labeling and the like, life science and the like, and has certain market prospect at home and abroad. The carbon-14 nuclide in China is almost imported, but in recent years, the supply crisis occurs due to the reduction of the supply of the carbon-14 nuclide in the international market. Based on the current market demand for carbon-14 nuclides, commercial operating pressure water reactor irradiation is intended to be used to produce the carbon-14 nuclides. In order to realize irradiation production of carbon-14 nuclide by a commercial pressurized water reactor, a safe, reliable and efficient irradiation target is required to be loaded in the reactor, neutrons generated by fission in the reactor and target materials filled in the target are used for carrying out activation reaction, a compound with the carbon-14 nuclide is finally generated, and a carbon-14 nuclide product meeting the market requirement is produced by matching with the later separation and remanufacturing processes.
In view of the above situation, there is a need for an irradiation target that can receive safe, reliable, and efficient irradiation in a reactor, has good structural strength, and can ensure that abnormal events such as component falling or target material leakage do not occur during operation in the reactor.
Disclosure of Invention
The utility model aims to provide an irradiation target for producing a carbon-14 nuclide by a pressurized water reactor nuclear power station, which can be safely, reliably and efficiently irradiated in a reactor, has better structural strength, meets the core requirement of producing the carbon-14 nuclide by irradiation of a commercial pressurized water reactor, and does not influence the safe operation of a nuclear power unit.
The technical scheme for realizing the purpose of the utility model is as follows: an irradiation target for producing carbon-14 nuclide by a pressurized water reactor nuclear power station comprises a star frame and a plurality of beam target rods, the tops of the beam target rods are arranged in the star frame, the beam target rods are used for filling AlN target materials, and the star frame is used for assembling and matching with a fuel assembly, a reactor internals and a lifting appliance; the star frame is composed of a plurality of groups of triangular structure frames, the groups of triangular structure frames are uniformly arranged along the circumferential direction of the star frame, and a plurality of beam target rods are arranged in each group of triangular structures.
The star frame further comprises a supporting boss positioned in the center of the plurality of groups of triangular structure frames and a hoisting structure positioned in the top of the supporting boss.
Each group of triangular structure frames of the star frame is formed by connecting three circular tubes, and the hoisting structure is oval and can relatively support the boss to rotate.
The target rod is of an inner-outer double-layer cladding structure, the outer layer of the target rod is an integrated outer cladding tube, and the inner layer of the target rod is provided with a plurality of AlN target materials or hollow inner target boxes which are positioned in the outer cladding tube; the inside of the outer envelope tube is filled with helium gas for heat transfer and deformation prevention.
The target rod further comprises an upper end plug positioned at the upper part of the outer cladding tube, an upper end socket positioned at the upper part of the upper end plug and a lower end socket positioned at the lower part of the lower end plug.
The number of the target rods is the same as that of the round tubes of the star frame.
The upper end head of each target rod is respectively inserted into each round tube of the star frame.
The target rod is in a rod-shaped structure.
The number of the outer circular tubes of the star frame is twice that of the inner circular tubes, and the inner circular tubes and the outer circular tubes are uniformly arranged at intervals along the circumferential direction of the star frame.
And a plurality of stop pins are uniformly arranged on the outer circumference of the support boss and are used for preventing the irradiation target from entering the protection tube assembly from the control rod guide clapboard.
The utility model has the beneficial technical effects that: the irradiation target for producing the carbon-14 nuclide by the commercial pressurized water reactor nuclear power station not only has better structural strength and stability, but also has better compatibility with other components and in-reactor components in a reactor, and does not influence the safe and stable operation of the reactor. The irradiation target piece adopts an internal and external double-layer structure, so that AlN powder cannot leak into a primary circuit coolant during irradiation; the inner target box is made of E110 alloy, and has good mechanical property and radiation resistance; the flexible target material filling capacity control mode is provided, and the adjustment of the carbon-14 yield is realized by adjusting the ratio of the number of the internal target boxes filled with the AlN target materials to the number of the hollow internal target boxes and simultaneously adjusting the compaction density of the AlN target materials; the irradiation target is designed with a stop pin to prevent the irradiation target from entering the protection tube assembly from the control rod guide clapboard, thereby ensuring the safe use of the target.
Drawings
FIG. 1 is a schematic structural diagram of a irradiation target for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant according to the present invention;
FIG. 2 is a schematic structural diagram of a spider of an irradiation target according to the present invention;
FIG. 3 is a schematic cross-sectional view of a target rod for irradiation of a target according to the present invention.
In the figure:
1. a star frame, 101 circular tubes, 102 supporting bosses, 103 hoisting structures, 104 stop pins 104;
2. target rod, 201, upper end, 202, upper end plug, 203, outer cladding tube, 204, inner target box, 205, lower end plug, 206, lower end.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in FIG. 1, the irradiation target for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant provided by the utility model comprises a star frame 1 and a target rod 2; each irradiation target is assembled by 1 star frame and 18 beams of target rods 2.
The structure of the star frame 1 is shown in fig. 2, and the whole material of the star frame 1 is stainless steel. The star frame 1 consists of a circular tube 101, a supporting boss 102 and a hoisting structure 103. The star frame 1 is used for assembling and matching the irradiation target with the fuel assembly, the in-pile member and the lifting appliance, and is an integral supporting and connecting part of the irradiation target.
As shown in fig. 2, the star frame 1 has 18 hollow circular tubes 101, each 3 circular tubes 101 are connected together, and is in a triangular frame structure, the inner ring has 6 circular tubes 101, and the outer ring has 12 circular tubes 101, as shown in fig. 1, the circular tubes 101 are used for assembling and connecting with the target rod 2 of the irradiation target;
as shown in fig. 2, in the center of the spider (connecting handle 1), there are a support boss 102 and a hoisting structure 103 integrated with the irradiation target. The lower surface of the supporting boss 102 is in contact with the upper surface of the fuel assembly, and the upper surface of the supporting boss 102 is in contact with the lower surface of the protection tube assembly, so that the stability of the irradiation target running in the reactor can be ensured, and the irradiation target is prevented from floating up and down due to the flushing of the reactor coolant. In addition, 3 protruding stop pins 104 are welded on the outermost periphery of the support boss 102 for preventing the irradiation target from entering the protective tube assembly from the control rod guide clapboard;
as shown in fig. 2, the hoisting structure 103 is oval in shape, is installed in the groove at the top of the support boss 102, and can rotate 90 ° relative to the support boss 102, and can rotate 90 ° after the hanger enters the hoisting structure 103, so as to perform operations such as hoisting of the irradiation target. The hoisting structure 103 is located in a groove at the top of the support boss 102 and welded with the support boss 102 into a whole.
The cross-sectional view of the target rod 2 is shown in fig. 3, and the target rod 2 has a generally rod-like structure and is composed of an upper end head 201, an upper end plug 202, an outer cladding tube 203, an inner target capsule 204, a lower end plug 205, and a lower end head 206. The target rod 2 is used for filling AlN target materials, so that the AlN target materials are ensured to receive safe irradiation in an active area in the reactor, and the AlN target materials are prevented from being directly contacted with a primary loop coolant. .
As shown in fig. 3, the upper end 201 is made of stainless steel material and is used for assembling the target rod 2 and the spider 1, the upper portion of the upper end 201 penetrates through the circular tube 10 of the spider 1 and is fixed by a nut through welding, and the lower portion of the upper end 201 is welded with the outer cladding tube 203 through the upper end plug 202.
As shown in fig. 3, upper end plug 202 is an E110 alloy for connecting upper end head 201 and outer cladding tube 203 for fixing.
As shown in fig. 3, the outer cladding tube 203 is E110 alloy, and is wrapped around the inner target capsule 204, and forms a sealed structure with the upper end plug 202 and the lower end plug 205 to prevent the coolant from directly contacting the inner target capsule 204, and the outer cladding tube 203 is filled with helium gas to perform heat transfer and prevent the outer cladding tube 203 from deforming.
As shown in fig. 3, the inner target capsule 204 is E110 alloy, the inside of which is filled with compacted AlN target material or not, each bundle of target rods 2 is provided with a certain number of inner target capsules 204, and the density of the AlN target material and the number ratio of the different types of inner target capsules 204 are adjusted according to the yield requirement of carbon-14. For example, the number of inner target cartridges 204 in this embodiment is 7.
As shown in fig. 3, the lower end plug 205 is E110 alloy, and is used for connecting and fixing the outer cladding tube 203 and the lower end plug 206.
As shown in FIG. 3, the lower tip 206 is E110 alloy, generally "bullet" shaped, and serves to secure the target 2 and to direct flow.
As shown in fig. 1, 2 and 3, in the reactor, 18 target rods 2 of the irradiation target are respectively inserted into 18 guide tubes of the fuel assembly, and the support bosses 102 of the spider 1 thereof are seated on the upper surface of the fuel assembly, thereby fixedly assembling the irradiation target; the lower end 206 of the target rod 2 is located at the lower end of the fuel assembly guide tube to ensure that the inner target capsules 204 mounted in the target rod 2 are all in the reactive region of the fuel assembly and thus receive a greater flux of neutron radiation.
As shown in fig. 1, 2 and 3, the moving operation of the irradiation target is realized by assembling a special hoisting tool with the spider 1. The hoisting structure design of the star frame 1 should be stable and reliable, and convenient to assemble with a special hoisting tool, including underwater operation.
AlN powder is produced by reacting natural aluminum with nitrogen, wherein the contents of N-14, N-15 and Al are abundances in nature.
During loading and unloading of the irradiation targets into and out of the reactor, necessary visual inspection should be performed to determine the structural integrity of the irradiation targets.
During the operation of the irradiation target in the reactor, on one hand, the reactor core parameters are required to be periodically evaluated to judge the influence of the irradiation target on the operation of the reactor; on the other hand, the water quality analysis of the primary loop coolant of the reactor, especially the monitoring of the carbon-14 nuclide and the AlN powder material, should be enhanced to judge the tightness of the irradiation target.
Referring to fig. 1, 2 and 3, the target material filled in the irradiation target for producing carbon-14 nuclide in a pressurized water reactor nuclear power plant is compacted aluminum nitride (AlN) powder. The nitrogen-14 species in aluminum nitride can react with neutrons to produce carbon-14, according to the following equation:
14N+1n→14C+1p
in order to ensure the safe operation of the reactor, on one hand, the irradiation target has better structural strength, and the abnormal problems of component falling or target material leakage and the like are avoided during the operation in the reactor; on the other hand, the designed irradiation target should have better compatibility with the fuel assembly, the related assembly and the in-reactor component in the reactor, namely the design of the irradiation target should be similar to the size structure of the related assembly in the reactor as much as possible, the matching degree is high, and the influence on the physical, thermal and related characteristic parameters of the reactor is reduced to the minimum.
The irradiation target piece is structurally provided with 1 star frame 1 and 18 target rods 2, the target rods 2 are designed to be of an inner-outer double-layer cladding structure, the outer layer is of an integral cladding tube structure (namely an outer cladding tube 203), the inner layer is provided with a plurality of AlN target materials or hollow cladding boxes (namely inner target boxes 204), the number ratio of the inner target boxes 204 filled with the AlN target materials to the number of the hollow inner target boxes 204 can be flexibly designed according to the yield requirement of carbon-14 nuclides, and the compaction density of the AlN target materials is adjusted in a matched mode. In order to reduce the irradiation elongation of the irradiation target, the structural materials of the active regions such as the inner and outer double-layer cladding, the end plugs and the like are all E110 alloy (zirconium-niobium alloy), and the connecting structures such as the star frame 1 and the like are made of stainless steel materials.
The irradiation target is fixed in the reactor by a guide tube inserted into the fuel assembly and is irradiated, and the irradiation target should be as active as possible in the reactor (i.e., the region where nuclear reaction occurs).
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the utility model.
Claims (10)
1. An irradiation target for producing carbon-14 nuclide in a pressurized water reactor nuclear power station is characterized in that: the irradiation target piece comprises a star frame (1) and a plurality of beam target rods (2) arranged at the top in the star frame (1), wherein the star frame (1) is composed of a plurality of groups of triangular structure frames, the plurality of groups of triangular structure frames are uniformly arranged along the circumferential direction of the star frame (1), and the plurality of beam target rods (2) are arranged in each group of triangular structures.
2. The irradiation target of claim 1, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: the star frame (1) further comprises a supporting boss (102) positioned in the center of the plurality of groups of triangular structure frames and a hoisting structure (103) positioned in the top of the supporting boss (102).
3. The irradiation target of claim 2, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: each group of triangular structure frames of the star frame (1) is formed by connecting three circular tubes (101), and the hoisting structure (103) is oval.
4. The irradiation target of claim 3, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: the target rod (2) is of an inner-outer double-layer cladding structure, the outer layer of the target rod is an integrated outer cladding tube (203), and the inner layer of the target rod is provided with a plurality of AlN target materials or hollow inner target boxes (204) which are positioned in the outer cladding tube (203).
5. The irradiation target of claim 4, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: the target rod (2) further comprises an upper end plug (202) positioned at the upper part of the outer cladding tube (203), an upper end head (201) positioned at the upper part of the upper end plug (202), and a lower end head (206) positioned at the lower part of the lower end plug (205).
6. The irradiation target of claim 5, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: the number of the target rods (2) is the same as that of the round tubes (101) of the star frame (1).
7. The irradiation target of claim 6, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: the upper end head (201) of each target rod (2) is respectively inserted into each round tube (101) of the star frame (1).
8. The irradiation target of claim 7, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: the target rod (2) is in a rod-shaped structure.
9. The irradiation target of claim 8, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: the star frame (1) is located the twice of the quantity of pipe (101) of the inner circle in the quantity of pipe (101) of outer circle, be located the even interval arrangement of pipe (101) of inner circle and outer circle all along star frame (1) circumference.
10. The irradiation target of claim 9, wherein the irradiation target is used for producing carbon-14 nuclear species in a pressurized water reactor nuclear power plant, and the irradiation target comprises: and a plurality of stop pins (104) are uniformly arranged on the outer circumference of the support boss (102).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120911005.5U CN216084347U (en) | 2021-04-29 | 2021-04-29 | Irradiation target for producing carbon-14 nuclide by pressurized water reactor nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120911005.5U CN216084347U (en) | 2021-04-29 | 2021-04-29 | Irradiation target for producing carbon-14 nuclide by pressurized water reactor nuclear power station |
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| CN216084347U true CN216084347U (en) | 2022-03-18 |
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| CN202120911005.5U Active CN216084347U (en) | 2021-04-29 | 2021-04-29 | Irradiation target for producing carbon-14 nuclide by pressurized water reactor nuclear power station |
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