CN111477358A - Strip grid cell combined positioning grid - Google Patents
Strip grid cell combined positioning grid Download PDFInfo
- Publication number
- CN111477358A CN111477358A CN202010449602.0A CN202010449602A CN111477358A CN 111477358 A CN111477358 A CN 111477358A CN 202010449602 A CN202010449602 A CN 202010449602A CN 111477358 A CN111477358 A CN 111477358A
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- CN
- China
- Prior art keywords
- grid
- fuel
- assembly
- strip
- strips
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000446 fuel Substances 0.000 claims abstract description 44
- 238000013461 design Methods 0.000 claims abstract description 10
- 125000006850 spacer group Chemical group 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 6
- 238000009835 boiling Methods 0.000 claims description 3
- 230000000712 assembly Effects 0.000 abstract description 8
- 238000000429 assembly Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 2
- 239000003758 nuclear fuel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/34—Spacer grids
- G21C3/356—Spacer grids being provided with fuel element supporting members
- G21C3/3566—Supporting members formed only of elements fixed on the strips
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/34—Spacer grids
- G21C3/348—Spacer grids formed of assembled non-intersecting strips
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/34—Spacer grids
- G21C3/352—Spacer grids formed of assembled intersecting strips
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Fuel Cell (AREA)
Abstract
The invention belongs to the technical field of fuel assemblies, and particularly relates to a strip grid element combined positioning grid. Comprises a grid cell, an outer strip and an inner strip; a plurality of inner strips are mutually inserted and arranged to form a square or hexagonal structure, and a circle of outer strips are welded and fixed around the square or hexagonal structure; the grid cells are welded in a grid space formed by mutually splicing the inner strips. The grid cell structure cylinder corner processing plane or the bulge is used as a supporting structure for supporting the fuel rod at the diagonal position of the grid, and is suitable for fuel assemblies with large diameter and small grid distance of the fuel rod; the clamping force of the supporting structure on the fuel rod can be adjusted according to the design requirement of the fuel assembly by adjusting the plane or the bulge at the cylinder corner of the grid cell structure; due to the structural form of adopting the inner straps as the framework, different grid cell forms can be adopted in different grids of the same positioning grid, and the fuel assembly with the inner straps is suitable for fuel rods with different rod diameters in the same fuel assembly.
Description
Technical Field
The invention belongs to the technical field of fuel assemblies, and particularly relates to a strip grid element combined positioning grid.
Background
During the operation of a nuclear power plant reactor, the performance of nuclear fuel is an important factor affecting the safety and economy of the reactor. Therefore, the research on fuel elements is put on a very prominent position internationally, and various performances of the nuclear fuel elements are continuously improved by optimizing the design of the fuel elements, adopting advanced structural materials, improving element manufacturing processes and other methods, so that nuclear power is promoted to develop towards a safer and more economic direction.
In the existing pressurized water reactor fuel assembly design, the fuel rods are generally clamped and suspended by a positioning grid. The spacer grids serve as support clamps for the fuel elements and need to resist the gravity action of the fuel elements, the clamping force of the springs clamping the fuel rods is drastically reduced due to the irradiation, the fuel rods generally fall on the bottom nozzle, and the fuel rods may move up and down under the flowing action of the coolant, which may cause the risk of breakage of the fuel rods.
If parameters of fuel elements are optimized and the universal fuel assembly appearance structure design is adopted, the novel assembly can be suitable for the current mature reactor core. If the novel annular fuel element is adopted, the outer diameter is large, the weight is increased, the clamping force of the required spacer grid can be increased by about 2-4 times, the space for placing clamping pieces such as springs and rigid protrusions is small, the probability that the fuel element falls on the lower pipe seat during operation is increased, and the probability that the fuel element moves up and down in the process of restarting after stopping and changing fuel is also increased.
Meanwhile, in the design and manufacture of the existing fuel assembly spacer grids, the spacer grids are basically composed of inner and outer strips. Due to the complexity of their strips, more than 30 molds are required for manufacturing. After the molds are determined, if the characteristics of the spacer grid, such as flow resistance, the distribution of the coolant among the fuel assemblies, etc., are to be changed, it is necessary to change the shape of almost all of the molds therein, which greatly increases the workload.
Accordingly, there is a need to design a new type of spacer grid for fuel assemblies that overcomes the deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a strip grid cell combined positioning grid to overcome the defects of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a strip grid cell combined positioning grid comprises grid cells, outer strips and inner strips; a plurality of inner strips are mutually inserted and arranged to form a square or hexagonal structure, and a circle of outer strips are welded and fixed around the square or hexagonal structure; the grid cells are welded in a grid space formed by mutually splicing the inner strips.
According to the actual design requirement of the fuel assembly, a plurality of grid cells are taken out to be used as guide pipe channels, and the guide pipes are arranged in the guide pipe channels and fixed with the inner strips.
When the inner strips are mutually inserted and arranged to form a square, the grid elements are cylindrical or tetrahedral tubes.
The four-side barrel comprises barrel corners and a barrel wall, and planes or bulges are processed at the barrel corners to serve as supporting structures.
When the inner strips are mutually spliced and arranged to form a hexagon, the grid cells are triangular cylinders.
And the three cylinder walls of the triangular cylinder body are processed with bulges to serve as supporting structures.
The location grid is applied to pressurized water reactors, marine power reactors and heavy water reactors.
The location grid is applied to fast reactor.
The spacer grid is applied to a power stack.
The location grid is applied to a boiling water reactor.
The beneficial effects obtained by the invention are as follows:
1. compared with the existing pressurized water reactor fuel assembly positioning grid, the grid cell structure cylinder corner processing plane or bulge is used as a supporting structure for supporting the fuel rods at the diagonal positions of the grid, and is suitable for fuel assemblies with large fuel rod diameter and small grid distance;
2. the clamping force of the supporting structure on the fuel rod can be adjusted according to the design requirement of the fuel assembly by adjusting the plane or the bulge at the cylinder corner of the grid cell structure;
3. compared with the prior grid cell type grillwork, the grid cell type grillwork has the advantages that due to the adoption of the structural form that the inner strips are used as the framework, different grid cell forms can be adopted in different grids of the same positioning grillwork, and the grid cell type grillwork is suitable for fuel rods with different rod diameters in the same fuel assembly;
4. the invention adopts a form of welding the grid cells and the strips, and the inner strip structure has simple form, small quantity of required moulds, simple assembly and high yield.
Drawings
FIG. 1 is a schematic diagram of a strip-cell combination-type spacer grid structure according to the present invention;
FIG. 2 is a top view of the rectangular array;
FIG. 3 is a top view of a hexagonal array;
FIG. 4 is a schematic diagram of a cell structure;
FIG. 5 is a schematic diagram of a strip grid cell combination spacer grid structure with guide tubes;
in the figure: 1. a grid cell; 2. an outer band; 3. an inner band; 4. a guide tube channel.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1-5, the strip-cell combined spacer grid of the present invention comprises cells 1, outer strips 2, inner strips 3, and guide tube channels 4;
a plurality of inner strips 3 are mutually spliced and arranged to form a square or hexagonal structure, and a circle of outer strips 2 are welded and fixed on the periphery of the square or hexagonal structure; the cells 1 are welded in the grid space formed by the mutual insertion of the inner strips 3. According to the actual design requirement of the fuel assembly, a plurality of cells 1 are taken out to be used as guide pipe channels 4, and the guide pipes are arranged in the guide pipe channels 4 and fixed with the inner strips 3.
When the inner strips 3 are mutually spliced and arranged to form a square, the grid cell 1 structure can be a cylinder or a tetrahedral cylinder according to the integral form of the positioning grid. The four-face cylinder body comprises cylinder corners and a cylinder wall, wherein the cylinder corners are processed with planes or bulges to serve as supporting structures for supporting fuel rods at opposite corners of the grids, and the four-face cylinder body is suitable for fuel assemblies with large fuel rod diameters and small grid distances.
When the inner strips 3 are mutually spliced and arranged to form a hexagon, the grid cell 1 structure can be a triangular cylinder body according to the integral form of the positioning grid, and the three cylinder walls of the triangular cylinder body are processed with bulges to serve as supporting structures for supporting fuel rods at opposite angles of the grid, so that the grid cell is suitable for fuel assemblies with large diameters and small grid distances of the fuel rods.
The invention can be applied to pressurized water reactors, marine power reactors, fast reactors, boiling water reactors, power reactors and heavy water reactors.
Claims (10)
1. A combined positioning grid for strip grid cells is characterized in that: comprises a grid cell, an outer strip and an inner strip; a plurality of inner strips are mutually inserted and arranged to form a square or hexagonal structure, and a circle of outer strips are welded and fixed around the square or hexagonal structure; the grid cells are welded in a grid space formed by mutually splicing the inner strips.
2. The lattice grid assembly of claim 1, wherein: according to the actual design requirement of the fuel assembly, a plurality of grid cells are taken out to be used as guide pipe channels, and the guide pipes are arranged in the guide pipe channels and fixed with the inner strips.
3. The lattice grid assembly of claim 1, wherein: when the inner strips are mutually inserted and arranged to form a square, the grid elements are cylindrical or tetrahedral tubes.
4. The lattice grid assembly of claim 3, wherein: the four-side barrel comprises barrel corners and a barrel wall, and planes or bulges are processed at the barrel corners to serve as supporting structures.
5. The lattice grid assembly of claim 1, wherein: when the inner strips are mutually spliced and arranged to form a hexagon, the grid cells are triangular cylinders.
6. The lattice grid assembly of claim 5, wherein: and the three cylinder walls of the triangular cylinder body are processed with bulges to serve as supporting structures.
7. The lattice grid assembly of claim 1, wherein: the location grid is applied to pressurized water reactors, marine power reactors and heavy water reactors.
8. The lattice grid assembly of claim 1, wherein: the location grid is applied to fast reactor.
9. The lattice grid assembly of claim 1, wherein: the spacer grid is applied to a power stack.
10. The lattice grid assembly of claim 1, wherein: the location grid is applied to a boiling water reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010449602.0A CN111477358A (en) | 2020-05-25 | 2020-05-25 | Strip grid cell combined positioning grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010449602.0A CN111477358A (en) | 2020-05-25 | 2020-05-25 | Strip grid cell combined positioning grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111477358A true CN111477358A (en) | 2020-07-31 |
Family
ID=71760300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010449602.0A Pending CN111477358A (en) | 2020-05-25 | 2020-05-25 | Strip grid cell combined positioning grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111477358A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113012826A (en) * | 2021-03-02 | 2021-06-22 | 上海交通大学 | Small-sized lead-cooled fast reactor core |
| CN115171923A (en) * | 2022-06-24 | 2022-10-11 | 上海核工程研究设计院有限公司 | Grid structure of fuel assembly and positioning grillwork |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1411002A (en) * | 2001-09-28 | 2003-04-16 | 中国核动力研究设计院 | Low pressure loss span mixing grillwork |
| CN103247354A (en) * | 2012-02-02 | 2013-08-14 | 巴布科克和威尔科克斯核能股份有限公司 | Spacer grid |
| CN106670662A (en) * | 2016-12-30 | 2017-05-17 | 中核北方核燃料元件有限公司 | Laser welding fixture for fuel element frame |
| CN109935369A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of lattice cell, spacer grid of fuel assembly and fuel assembly |
| CN212874068U (en) * | 2020-05-25 | 2021-04-02 | 中国原子能科学研究院 | Strip grid cell combined positioning grid |
-
2020
- 2020-05-25 CN CN202010449602.0A patent/CN111477358A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1411002A (en) * | 2001-09-28 | 2003-04-16 | 中国核动力研究设计院 | Low pressure loss span mixing grillwork |
| CN103247354A (en) * | 2012-02-02 | 2013-08-14 | 巴布科克和威尔科克斯核能股份有限公司 | Spacer grid |
| CN106670662A (en) * | 2016-12-30 | 2017-05-17 | 中核北方核燃料元件有限公司 | Laser welding fixture for fuel element frame |
| CN109935369A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of lattice cell, spacer grid of fuel assembly and fuel assembly |
| CN212874068U (en) * | 2020-05-25 | 2021-04-02 | 中国原子能科学研究院 | Strip grid cell combined positioning grid |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113012826A (en) * | 2021-03-02 | 2021-06-22 | 上海交通大学 | Small-sized lead-cooled fast reactor core |
| CN115171923A (en) * | 2022-06-24 | 2022-10-11 | 上海核工程研究设计院有限公司 | Grid structure of fuel assembly and positioning grillwork |
| CN115171923B (en) * | 2022-06-24 | 2024-06-07 | 上海核工程研究设计院股份有限公司 | Fuel assembly grid structure and positioning grid |
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