CN212135975U - Annular fuel rod fixing clamp ring and fixing device - Google Patents
Annular fuel rod fixing clamp ring and fixing device Download PDFInfo
- Publication number
- CN212135975U CN212135975U CN202020898038.6U CN202020898038U CN212135975U CN 212135975 U CN212135975 U CN 212135975U CN 202020898038 U CN202020898038 U CN 202020898038U CN 212135975 U CN212135975 U CN 212135975U
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- Prior art keywords
- fuel rod
- fixing
- snap ring
- fixing device
- annular fuel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
A fixing clamp ring and a fixing device for an annular fuel rod comprise a fixing nut and a clamp ring; the clamping ring is integrally of a C-shaped structure, and a mounting circular hole is formed in the opening; the lower end of the fuel rod is provided with a groove; the lower end of the fuel rod is arranged on the lower tube seat through a fixing nut. When the disassembly is needed, force to two sides is applied from the opening of the clamping ring, so that the quick disassembly is realized. The inner side of the fixed nut is provided with a thread structure. The screw thread of the inner side of the fixed nut is matched with the screw thread of the lower tube seat. And a snap ring is arranged on the lower side of the fixed nut.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel, and particularly relates to an annular fuel rod fixing clamp ring and a fixing device.
Background
In the current fuel assembly design, a fuel rod is clamped by a positioning grid and fixed between an upper pipe seat and a lower pipe seat, and a certain gap exists between a lower end plug of the fuel rod and the lower pipe seat. When the spacer grids are loosened during the operation of the reactor, the clamping force is weakened and is not enough to fix the fuel rods, the fuel rods fall down, and the integrity of the fuel rods is possibly threatened and the failure probability of the fuel rods is increased in the process that the lower end plugs of the fuel rods fall down and collide with the lower pipe seats. In addition, under the condition that the spacer grids lose clamping force, the fuel rods falling on the lower tube seat can move up and down under the action of water flow lifting force, so that the friction between the fuel rods and the spacer grids and the collision probability between the fuel rods and the lower tube seat are increased, and the safety of the fuel rods is not facilitated.
The fuel rod with the free lower end plug is easy to generate flow-induced vibration in the process of scouring the coolant, and the contact position of the vibrating fuel rod and the positioning grid generates fretting abrasion, so that the cladding thickness of the fuel rod is reduced, even the cladding is cracked, and the leakage of radioactive substances is possible to occur.
The annular fuel rod cools the fuel rod through the enclosed inner and outer coolant flow channels. With the operation of the reactor, tiny impurities, such as waste remained in the manufacturing process of components in the pressure vessel stack or in a main loop pipeline, or corrosion products formed in the operation process of the reactor, are easy to occur in a main system, so that the flow channel of the fuel rod is easily blocked, the central hole of the lower end plug is the only water inlet hole of the internal flow channel, and if the water inlet hole of the lower end plug is blocked, the flow of the internal flow channel of the annular fuel rod is reduced, the sufficient cooling capacity of the fuel rod cannot be maintained, and the safety of the fuel rod is threatened.
Disclosure of Invention
The invention aims to solve the defects in the prior art and design an annular fuel rod fixing device.
The technical scheme of the invention is as follows: a fixing clamp ring and a fixing device for an annular fuel rod comprise a fixing nut, a clamp ring and a fuel rod; the lower end of the fuel rod is provided with a groove; the lower end of the fuel rod is arranged on the lower tube seat.
When the disassembly is needed, force to two sides is applied from the opening of the clamping ring, so that the quick disassembly is realized.
The lower end of the fuel rod is arranged on the lower tube seat through a fixing nut.
The inner side of the fixed nut is provided with a thread structure.
The screw thread of the inner side of the fixed nut is matched with the screw thread of the lower tube seat.
And a snap ring is arranged on the lower side of the fixed nut.
The whole clamping ring is of a C-shaped structure.
The opening of the snap ring is provided with a mounting round hole.
The annular fuel rod fixing clamp ring and the fixing device are applied to pressurized water reactors, marine power reactors, fast reactors and boiling water reactors.
The annular fuel rod fixing clamp ring and the fixing device are applied to power piles and heavy water piles.
The invention has the beneficial effects that:
the lower end fixing piece is used for connecting and fixing the lower end plug and the lower tube seat, so that the fuel rod is prevented from falling on the lower tube seat in the reactor operation process, the falling impact force is avoided, and the failure probability of the fuel rod is reduced. Meanwhile, the lower end fixing piece fixes the fuel rod on the lower tube seat, so that the fuel rod is prevented from moving axially under the action of the flow lifting force of the coolant, and the friction between the fuel rod and the positioning lattice frame is reduced.
The lower end plug and the lower pipe seat are fixed through the lower end fixing piece, flow-induced vibration caused by scouring of the fuel rods by the coolant is reduced, fretting abrasion of the fuel rods is reduced, and the failure risk of the fuel rods is reduced.
Drawings
FIG. 1 is a schematic view of a fuel rod of the present invention
FIG. 2 is a schematic view of the installation of the fixing snap ring and the fixing device for the annular fuel rod according to the present invention
FIG. 3 is a schematic view of the fixing snap ring and the fixing device for the annular fuel rod of the present invention
FIG. 4 is a schematic view of the fixing snap ring and the fixing nut of the fixing device for an annular fuel rod according to the present invention
FIG. 5 is a schematic view of a retaining snap ring and a retaining device snap ring for an annular fuel rod according to the present invention
In the figure: fixing nut 1, snap ring 2, groove 3, lower pipe seat 4, fuel rod 5 and mounting round hole 6
Detailed Description
A fixing clamp ring and a fixing device for an annular fuel rod comprise a fixing nut 1 and a clamp ring 2, wherein the fixing nut 1 is shown in figure 4, and the inner side of the fixing nut is provided with a thread structure; the structure of the snap ring 2 is shown in figure 5, the whole snap ring is of a C-shaped structure, and an installation round hole 6 is arranged at the opening to play a role in installation and fixation; the fuel rod 5 is shown in fig. 1, and the lower end of the fuel rod 5 is provided with a groove 3.
As shown in fig. 2 and 3, the lower end of the fuel rod 5 is mounted on the lower tube base 4 through the fixing nut 1, the inner thread of the fixing nut 1 is matched with the thread of the lower tube base 4, and the snap ring 2 is mounted on the lower side of the fixing nut 1, so that the fixing nut 1 is prevented from loosening.
The device has the characteristic of vibration resistance, and can not fall off under the condition of vibration;
when the disassembly is needed, force towards two sides is applied from the opening of the clamping ring 2, so that the quick disassembly is realized.
Claims (10)
1. The utility model provides a snap ring and fixing device are fixed to annular fuel rod which characterized in that: comprises a fixed nut (1), a snap ring (2) and a fuel rod (5); the lower end of the fuel rod (5) is provided with a groove (3); the lower end of the fuel rod (5) is arranged on the lower tube seat (4).
2. The annular fuel rod fixing snap ring and fixing device as claimed in claim 1, wherein: when the disassembly is needed, force towards two sides is applied from the opening of the clamping ring (2), so that the quick disassembly is realized.
3. The annular fuel rod fixing snap ring and fixing device as claimed in claim 1, wherein: the lower end of the fuel rod (5) is arranged on the lower tube seat (4) through a fixing nut (1).
4. The annular fuel rod fixing snap ring and fixing device as claimed in claim 3, wherein: the inner side of the fixed nut (1) is provided with a thread structure.
5. The annular fuel rod fixing snap ring and fixing device as claimed in claim 4, wherein: the thread on the inner side of the fixed nut (1) is matched with the thread of the lower tube seat (4).
6. The annular fuel rod fixing snap ring and fixing device as claimed in claim 1, wherein: a snap ring (2) is arranged on the lower side of the fixed nut (1).
7. The annular fuel rod fixing snap ring and fixing device as claimed in claim 6, wherein: the clamping ring (2) is of a C-shaped structure as a whole.
8. The annular fuel rod fixing snap ring and fixing device as claimed in claim 7, wherein: an opening of the snap ring (2) is provided with a mounting round hole (6).
9. The annular fuel rod fixing snap ring and fixing device as claimed in any one of claims 1 to 8, wherein: the annular fuel rod fixing clamp ring and the fixing device are applied to pressurized water reactors, marine power reactors, fast reactors and boiling water reactors.
10. The annular fuel rod fixing snap ring and fixing device as claimed in any one of claims 1 to 8, wherein: the annular fuel rod fixing clamp ring and the fixing device are applied to power piles and heavy water piles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020898038.6U CN212135975U (en) | 2020-05-25 | 2020-05-25 | Annular fuel rod fixing clamp ring and fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020898038.6U CN212135975U (en) | 2020-05-25 | 2020-05-25 | Annular fuel rod fixing clamp ring and fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212135975U true CN212135975U (en) | 2020-12-11 |
Family
ID=73670246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020898038.6U Active CN212135975U (en) | 2020-05-25 | 2020-05-25 | Annular fuel rod fixing clamp ring and fixing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212135975U (en) |
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2020
- 2020-05-25 CN CN202020898038.6U patent/CN212135975U/en active Active
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