CN115171923B - Fuel assembly grid structure and positioning grid - Google Patents
Fuel assembly grid structure and positioning grid Download PDFInfo
- Publication number
- CN115171923B CN115171923B CN202210723281.8A CN202210723281A CN115171923B CN 115171923 B CN115171923 B CN 115171923B CN 202210723281 A CN202210723281 A CN 202210723281A CN 115171923 B CN115171923 B CN 115171923B
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- fuel assembly
- fuel
- clamping
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- 239000000446 fuel Substances 0.000 title claims abstract description 95
- 238000003466 welding Methods 0.000 claims description 30
- 210000002105 tongue Anatomy 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 15
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 230000000712 assembly Effects 0.000 abstract description 12
- 238000000429 assembly Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 9
- 239000007787 solid Substances 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000003758 nuclear fuel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
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
-
- 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
- G21C3/344—Spacer grids formed of assembled tubular elements
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a fuel assembly grid structure and a positioning grid, relates to the technical field of fuel assemblies, solves the problem that the prior grid cells cannot be applied to dense arrangement of small-diameter fuel rods, ensures the clamping and fixing effects on the fuel rods, and adopts the following specific scheme: the device comprises a plurality of supporting cells and fixed connection units, wherein the supporting cells are of special-shaped tube structures, the special-shaped tubes are mutually spliced and arranged to form a square structure, a circle of outer strips are fixed on the periphery of the square structure, and the fixed connection units are arranged in the square structure at intervals; the tube walls of the special tubes are inwards recessed along the circumferential intervals to form clamping parts for clamping the fuel rods, and the other tube walls of the special tubes are fixedly connected with the connecting parts of the adjacent special tubes as connecting parts.
Description
Technical Field
The invention relates to the technical field of fuel assemblies, in particular to a fuel assembly grid structure and a positioning grid.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Pressurized water nuclear reactor fuel assemblies are typically constructed from a number of fuel rods, guide tube assemblies, instrumentation tube assemblies, grids, top and bottom headers, and the like.
The grids serve as important components of the fuel assembly framework, and after being connected with the guide pipes and the instrumentation pipes, the grids form the fuel assembly framework together with the upper pipe seat and the lower pipe seat, and play roles in structural support and transverse load transmission.
The inventor finds that the prior grid cell is suitable for the arrangement of commercial pressurized water reactor fuel assemblies, and the prior commercial pressurized water reactor fuel assemblies have larger fuel rod spacing, generally about 10-15 mm; in order to improve the fuel heat exchange area, a thinner rod diameter and a tighter cell design are needed, so that the distance between fuel rods is reduced to about 7-9 mm, and the gap space between entities is reduced to 1-3 mm, which is only 2-6 times the thickness of the spring piece material. When the existing grid is used for densely arranging fuel assemblies of the fuel assemblies for the ocean nuclear power plant, the rigid protrusions and springs of the grid cannot be installed due to the influence of densely arranging intervals of the fuel assemblies of the small rod diameters, the fuel rods cannot be fixed, the fuel rods are easy to damage due to flow-induced vibration, and when the fuel assemblies of the small rod diameters are densely arranged, cooling channels between the fuel rods are closed, so that cooling of the fuel rods is seriously influenced.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a grid structure and a positioning grid of a fuel assembly, which are characterized in that special pipes are used for clamping and fixing fuel rods, the inner walls of the inward depressions of the special pipes are used for replacing rigid protrusions and springs, and cooling channels for cooling are formed between adjacent special pipes, so that the problems that the small-diameter dense fuel rods cannot be fixed and the cooling of the fuel rods is easily influenced when the existing grid cells are densely arranged.
In order to achieve the above object, the present invention is realized by the following technical scheme:
In a first aspect, the invention provides a fuel assembly grid structure, which comprises a plurality of support grid cells and fixed connection units, wherein the support grid cells are of special-shaped tube structures, a plurality of special-shaped tubes are mutually spliced and arranged to form a square structure, a circle of outer strips are fixed on the periphery of the square structure, and the fixed connection units are arranged in the square structure at intervals; the tube walls of the special tubes are inwards recessed along the circumferential intervals to form clamping parts for clamping the fuel rods, and the other tube walls of the special tubes are fixedly connected with the connecting parts of the adjacent special tubes as connecting parts.
As a further implementation manner, the clamping parts extend along the axis of the special pipe, and the inscribed circle formed by encircling all the clamping parts on the special pipe is matched with the outer diameter of the fuel rod to be clamped.
As a further implementation manner, the clamping part is of a spiral linear structure distributed along the axial direction of the special-shaped tube.
As a further implementation manner, the adjacent special pipes are surrounded by adjacent connecting parts and clamping parts to form a cooling channel.
As a further implementation manner, the special-shaped tube is a column tube structure with a constant section in the axial direction, and the clamping part has a constant size in the axial direction.
As a further implementation mode, the special pipe is of a column pipe structure with a variable cross section in the axial direction, a gap exists between the clamping parts at the two ends of the special pipe and the outer wall of the fuel rod, and the clamping parts at the middle position of the special pipe are in interference fit with the fuel rod so as to reduce pressure drop at the two ends of the special pipe.
As a further implementation mode, the fixed connection unit is formed by encircling a plurality of welding tongues, and the length of each welding tongue is larger than that of the special pipe.
As a further implementation mode, the welding tongue is composed of a middle arc-shaped part and extension parts which are oppositely arranged at two sides of the middle arc-shaped part, the arc-shaped part can be matched with the adjacent arc-shaped part to form an annular positioning structure for installing the grid sleeve, and the extension parts are used for enlarging the contact area of the welding tongue and the special pipe.
In a second aspect, the invention provides a spacer grid, which comprises a plurality of fuel assembly grid structures according to the first aspect, wherein the plurality of fuel assembly grid structures are sequentially arranged at intervals, and the special pipes on adjacent fuel assembly grid structures are in one-to-one correspondence and are coaxially arranged between the corresponding special pipes.
As a further implementation, it further comprises a number of grid sleeves, which extend through all fuel assembly grid structures, which are fixedly arranged in the fixed connection unit.
The beneficial effects of the invention are as follows:
(1) The supporting cells are of the special-shaped tube structure, the tube walls of the special-shaped tubes are inwards recessed to form the clamping parts, the clamping parts are arranged at intervals along the circumferential direction of the special-shaped tubes, the fuel rods can be clamped and fixed through cooperation between the clamping parts, the use of inner strip rigid protrusions, springs and the like is omitted, the problem that the use of the supporting cells is easily influenced by the size and the spacing of the fuel rods is effectively avoided, and the supporting cells are suitable for dense arrangement of small-diameter fuel rods.
(2) The clamping part extends along the radial direction of the special pipe, so that the outer wall of the fuel rod can be axially supported, and the rigidity of the fuel rod is improved while the clamping is ensured.
(3) The special pipe adopts a variable cross-section structural form, when cooling water passes through the middle position of the special pipe, the flow speed of the cooling water can be increased due to the reduction of the flow cross section, and meanwhile, the increase of the flow speed is accompanied with the reduction of the fluid pressure, so that an adsorption effect is generated, the pressure drop at the two ends of the special pipe is reduced, and the cooling speed of a fuel rod in the special pipe is ensured.
(4) The welding tongue is composed of the middle arc-shaped part and the extending parts oppositely arranged at the two sides of the middle arc-shaped part, the arc-shaped part can be matched with other adjacent arc-shaped parts to form an annular positioning structure, the grid sleeve and the grid are fixed, and the problem that the grid sleeve and the special-shaped pipe are incompatible is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a front view of a fuel assembly grid structure in accordance with one or more embodiments of the present invention;
FIG. 2 is a schematic side view of a fuel assembly grid structure according to one or more embodiments of the invention;
FIG. 3 is an enlarged partial schematic view of the location of structure A of FIG. 1;
in the figure: the mutual spacing or size is exaggerated for showing the positions of all parts, and the schematic drawings are used only for illustration;
Wherein, 1, special-shaped tube; 2. a welding tongue; 3. an outer band; 4. a fuel rod; 5. a cooling channel; 6. a fixed connection unit; 7. a clamping part; 8. a connection part; 9. an arc-shaped portion; 10. an extension.
Noun interpretation:
Flow induced vibration: when fluid flows through the solid, alternating fluid force is applied to the surface of the solid, so that the solid reciprocates, the reciprocating motion of the solid changes the fluid state, and further the fluid force acting on the surface of the solid is changed, and the interaction phenomenon of the fluid and the solid is called fluid-induced vibration;
pressure drop: the pressure of the fluid decreases as it flows in the tube due to energy loss.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As described in the background art, when the existing grid cells are used for densely arranging fuel assembly thin rod diameter fuel rods for ocean nuclear power devices, rigid protrusions and springs of grids cannot be arranged due to the influence of densely arranging intervals of the thin rod diameters, the thin diameter dense fuel rods cannot be fixed, the fuel rods are easy to damage due to flow-induced vibration, cooling channels between the fuel rods are closed when the existing grid cells are densely arranged, and the cooling problem of the fuel rods is seriously influenced.
Example 1
In an exemplary embodiment of the present invention, as shown in fig. 1-3, a fuel assembly grid structure is provided, which has a capability of fixing and supporting a fuel assembly in a narrow space, and comprises a special pipe 1, a welding tongue 2 and an outer strip 3, wherein the special pipe 1 mainly transversely supports a fuel rod 4 and plays a role of clamping and fixing the fuel rod 4; the welding tongues 2 mainly play a transitional role to avoid incompatibility problems between the grid sleeve and the special-shaped tube.
The outer contour of the grid structure is square, the grid structure is formed by welding a plurality of special pipes 1, welding tongues 2 and outer strips 3, in particular, a plurality of special pipes 1 are mutually spliced and arranged to form an n multiplied by n square structure, adjacent special pipes 1 are fixed through welding, a circle of outer strips 3 are fixed on the periphery of the square structure through welding, the width of each outer strip 3 is the same as the length of each special pipe 1, fixed connection units 6 are arranged in the square structure at intervals, each special pipe 1 is a supporting grid element, and a columnar fuel rod 4 can be fixed in each supporting grid element.
As shown in fig. 3, the wall of the special tube 1 is recessed inwards to form a clamping part 7 for clamping the fuel rod 4, and the other walls of the special tube 1 are used as connecting parts 8 to be matched with the connecting parts of the adjacent special tubes 1 to realize the fixed connection of the adjacent special tubes 1.
The clamping parts 7 are provided with a plurality of clamping parts, the number of the clamping parts is at least two (the clamping parts 7 are arranged oppositely when the number of the clamping parts is two), the number of the clamping parts is optimally four, the clamping parts 7 are arranged at intervals along the circumferential direction of the special-shaped tube 1 and extend along the axial direction of the special-shaped tube 1, the inscribed circle size formed by encircling all the clamping parts 7 on the special-shaped tube 1 is matched with the outer diameter of the fuel rod 4 to be clamped, and the fuel rod 4 placed in the special-shaped tube 1 can be clamped and fixed under the cooperation of the clamping parts 7.
The lateral part that clamping part is used for contacting, connecting (namely the clamping part is the cambered surface structure with the position of the outer wall contact of fuel rod 4), adopts the mode of line contact to contact between the outer wall of fuel rod 4, guarantees clamping stability to fuel rod 4 of clamping part 7, still is favorable to improving the abrasion resistance of fuel rod.
It will be appreciated that in other embodiments, the clamping portion 7 may be configured as a spiral structure axially distributed along the special tube 1, and may be a single continuous spiral or may be a spiral formed by combining multiple segments, which may be specifically determined according to practical design requirements, where no excessive limitation is imposed, and the design of the spiral structure of the clamping portion 7 greatly improves the heat transfer efficiency of the fuel rod.
The arrangement of the clamping part 7 eliminates the use of the rigid convex and spring of the inner strip, effectively avoids the problem of difficult installation of the rigid convex and spring when the thin diameter fuel rods are densely arranged, and improves the rigidity of the fuel rods 4 and maintains the spacing between the fuel rods 4 as the clamping part 7 extends along the axial direction of the special pipe 1.
The connecting parts 8 are also provided with a plurality of connecting parts 8, the connecting parts 8 protrude outwards relative to the clamping parts, the connecting parts 8 are arranged at intervals along the circumferential direction of the special-shaped tube 1, extend along the axial direction of the special-shaped tube 1 and can be matched with the connecting parts 8 adjacent to the special-shaped tube 1 to realize fixed connection.
The lateral part that connecting portion 8 was used for contacting, connecting (i.e. connecting portion and adjacent mechanical tubes 1 connecting portion contact's position) is planar structure, has not only enlarged the area of contact between connecting portion 8 for the welding is more firm, has still made things convenient for the butt joint between connecting portion 8 and the connecting portion 8, has reduced the installation degree of difficulty.
Due to the arrangement of the clamping parts 7 and the connecting parts 8, when the adjacent special pipes 1 are connected, gaps are reserved between the adjacent special pipes 1 under the action of the clamping parts 7 and the connecting parts 8, after the adjacent special pipes 1 are spliced and arranged, a plurality of gap combinations can form cooling channels 5 between the adjacent special pipes 1, and the cooling channels 5 are formed by surrounding the adjacent connecting parts 8 and the clamping parts 7 and cannot be closed due to the influence of the diameters of the special pipes 1, so that the problem that the cooling channels 5 are easy to close when the small-diameter fuel rods 4 are densely arranged is avoided.
The special-shaped tube 1 can be a column tube structure with a constant section in the axial direction, and can also be arranged along the axial direction with a variable section, and specifically, the section in the axial direction is not changed into the clamping part 7, and the dimension of the clamping part in the axial direction of the special-shaped tube 1 is kept unchanged; the axial variable cross section is arranged that the size of the clamping part 7 changes and smoothly transits along the axial direction of the special pipe 1, so that a gap of 0-0.2 mm exists between the two ends of the special pipe 1 and the outer wall of the fuel rod 4, and an interference fit of about 0.2mm exists between the middle position of the special pipe 1 and the fuel rod 4 to provide clamping force, namely the diameters of the two ends of the special pipe 1 are larger than the middle diameter, and the clamping effect is realized only in the middle position.
When adopting the structural style of variable cross section, when cooling water passes through the intermediate position department of mechanical tubes 1, the cooling water can increase the velocity of flow because of the reduction of flow section, and the increase of velocity of flow is accompanied by the reduction of fluid pressure simultaneously to produce adsorption effect, reduce the pressure drop at mechanical tubes both ends, avoided the loss of cooling water velocity of flow, thereby guaranteed the cooling rate of fuel rod in the mechanical tubes 1.
It will be appreciated that the sizing of the clamping portion 7 may be determined according to actual design requirements, without undue limitation.
The welding tongues 2 are provided with a plurality of welding tongues 2, four welding tongues 2 are enclosed to form a fixed connection unit 6, the fixed connection unit 6 is fixedly arranged among the plurality of special pipes 1 at intervals, the length of the welding tongues 2 is longer than that of the special pipes 1, so that the welding tongues 2 penetrate through a grid structure, as shown in fig. 1, the welding tongues 2 are composed of an arc-shaped part in the middle and extension parts 10 which are oppositely arranged at two sides of the arc-shaped part 9, wherein the arc-shaped part 9 can be matched with other adjacent three arc-shaped parts 9 to form an annular positioning structure, a grid sleeve can be placed among the four arc-shaped parts 9, and the outer wall of the grid sleeve is fixedly connected with the arc-shaped part 9 in a welding mode;
the extension portion 10 stretches towards the two sides of the arc portion 9 away from the circle center direction, and is mainly used for fixing the position of the welding tongue 2, the welding tongue 2 can be welded and fixed with the adjacent special-shaped tube 1 through the extension portion 10, and compared with a mode of only utilizing the arc portion to perform welding and fixing, the contact area between the welding tongue 2 and the special-shaped tube 1 is larger, and the installation stability is higher.
Through the cooperation use of the welding tongue 2 and the special pipe 1, the full-angle azimuth space can be utilized, so that the fixed clamping work of dense space which cannot be completed by the strip grid element is realized (the traditional strip grid intelligently utilizes specific angles, such as 0 degree, 90 degree, 180 degree and 270 degree).
It will be appreciated that the grid sleeve is a structure for accommodating the pipeline and other control components, and therefore the specific dimensions of the fixed connection unit 6 need to be determined according to the outer diameter of the grid sleeve, without undue limitation.
Example 2
In another exemplary embodiment of the present invention, a spacer grid is provided, which includes a plurality of fuel assembly grid structures and a plurality of grid sleeves according to example 1, wherein the plurality of fuel assembly grid structures are sequentially arranged at intervals, all the fuel assembly grid structures are parallel to each other, so that the special pipes 1 on adjacent fuel assembly grid structures are in one-to-one correspondence and are coaxially arranged between the corresponding special pipes 1, so as to clamp and fix the fuel rods 4; similarly, the fixed connection units 6 on the adjacent fuel assembly grid structure are in one-to-one correspondence and are coaxially arranged between the corresponding fixed connection units 6 so as to be used for fixedly mounting the grid sleeve.
The grid sleeve penetrates through all the fuel assembly grid structures, the grid sleeve is fixedly arranged in the fixed connection unit 6, and functional components such as pipelines, control assemblies and the like can be arranged in the grid sleeve according to requirements.
It will be appreciated that the number of fuel assembly grid structures and the spacing between adjacent fuel assembly grid structures may be selected based on actual requirements without undue limitation.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The grid structure of the fuel assembly is characterized by comprising a plurality of supporting grid elements and fixed connection units, wherein the supporting grid elements are of special-shaped tube structures, a plurality of special-shaped tubes are mutually spliced and arranged to form a square structure, a circle of outer strips are fixed on the periphery of the square structure, and the fixed connection units are arranged in the square structure at intervals; the tube walls of the special-shaped tubes are inwards recessed along the circumferential intervals to form clamping parts for clamping the fuel rods, and the other tube walls of the special-shaped tubes are fixedly connected with the connecting parts of the adjacent special-shaped tubes as connecting parts;
The special pipe is of a column pipe structure with a variable cross section in the axial direction, a gap exists between the clamping parts at the two ends of the special pipe and the outer wall of the fuel rod, and the clamping parts at the middle position of the special pipe are in interference fit with the fuel rod and are used for reducing pressure drop at the two ends of the special pipe.
2. A fuel assembly grid structure according to claim 1, wherein the clamping portions extend along the axis of the manifold, and the dimensions of the inscribed circle defined by all the clamping portions on the manifold match the outer diameter of the fuel rod to be clamped.
3. A fuel assembly grid structure according to claim 1, wherein the clamping portions are in a spiral configuration axially distributed along the profile tube.
4. A fuel assembly grid structure according to claim 1, wherein the adjacent tubes are surrounded by adjacent connecting portions and clamping portions to form cooling channels.
5. A fuel assembly grid structure according to claim 1, wherein the profile tube is a pillar tube structure of constant axial cross section, and the clip portion is of constant axial dimension.
6. The fuel assembly grid structure according to claim 1, wherein the fixed connection unit is formed by surrounding a plurality of welding tongues, and the length of the welding tongues is larger than that of the special-shaped tube.
7. The fuel assembly grid structure according to claim 6, wherein the welding tongue is formed by a middle arc-shaped part and extension parts which are oppositely arranged at two sides of the welding tongue, the arc-shaped part can be matched with the adjacent arc-shaped part to form an annular positioning structure for installing the grid sleeve, and the extension parts are used for enlarging the contact area of the welding tongue and the special-shaped tube.
8. A spacer grid comprising a plurality of fuel assembly grid structures according to any one of claims 1 to 7, wherein the plurality of fuel assembly grid structures are arranged at intervals in sequence, and the special pipes on adjacent fuel assembly grid structures are in one-to-one correspondence and are coaxially arranged between the corresponding special pipes.
9. A spacer grid as claimed in claim 8, further comprising a plurality of grid sleeves extending through all of the fuel assembly grid structures, the grid sleeves being fixedly disposed within the fixed connection units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723281.8A CN115171923B (en) | 2022-06-24 | 2022-06-24 | Fuel assembly grid structure and positioning grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723281.8A CN115171923B (en) | 2022-06-24 | 2022-06-24 | Fuel assembly grid structure and positioning grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115171923A CN115171923A (en) | 2022-10-11 |
| CN115171923B true CN115171923B (en) | 2024-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210723281.8A Active CN115171923B (en) | 2022-06-24 | 2022-06-24 | Fuel assembly grid structure and positioning grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115171923B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270511A (en) * | 2011-07-18 | 2011-12-07 | 中国原子能科学研究院 | Tubular positioning grid for pressurized water reactor double-sided cooling fuel rod |
| CN202948743U (en) * | 2012-12-20 | 2013-05-22 | 中国核动力研究设计院 | Structural grillwork with bottom rectifying effect for nuclear fuel assembly |
| CN103177776A (en) * | 2013-01-14 | 2013-06-26 | 上海核工程研究设计院 | Fuel assembly positioning grid capable of preventing fuel rod from being scratched and subjected to vibrating abrasion |
| CN107980163A (en) * | 2017-09-20 | 2018-05-01 | 岭澳核电有限公司 | Grid spacer and fuel assembly |
| CN109935370A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of spacer grid of fuel assembly and fuel assembly with plug-in unit |
| CN109935367A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of spacer grid of fuel assembly and fuel assembly of band buckle |
| CN109935365A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of band tubular type lattice cell spacer grid of fuel assembly |
| CN111477358A (en) * | 2020-05-25 | 2020-07-31 | 中国原子能科学研究院 | Strip grid cell combined positioning grid |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8374308B2 (en) * | 2005-01-11 | 2013-02-12 | Westinghouse Electric Company Llc | Helically fluted tubular fuel rod support |
| US10818402B2 (en) * | 2017-03-31 | 2020-10-27 | Westinghouse Electric Company Llc | Spacer grid using tubular cells with mixing vanes |
-
2022
- 2022-06-24 CN CN202210723281.8A patent/CN115171923B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270511A (en) * | 2011-07-18 | 2011-12-07 | 中国原子能科学研究院 | Tubular positioning grid for pressurized water reactor double-sided cooling fuel rod |
| CN202948743U (en) * | 2012-12-20 | 2013-05-22 | 中国核动力研究设计院 | Structural grillwork with bottom rectifying effect for nuclear fuel assembly |
| CN103177776A (en) * | 2013-01-14 | 2013-06-26 | 上海核工程研究设计院 | Fuel assembly positioning grid capable of preventing fuel rod from being scratched and subjected to vibrating abrasion |
| CN107980163A (en) * | 2017-09-20 | 2018-05-01 | 岭澳核电有限公司 | Grid spacer and fuel assembly |
| CN109935370A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of spacer grid of fuel assembly and fuel assembly with plug-in unit |
| CN109935367A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of spacer grid of fuel assembly and fuel assembly of band buckle |
| CN109935365A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of band tubular type lattice cell spacer grid of fuel assembly |
| CN111477358A (en) * | 2020-05-25 | 2020-07-31 | 中国原子能科学研究院 | Strip grid cell combined positioning grid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115171923A (en) | 2022-10-11 |
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