CN114220559A - Single metal positioning grid frame for reducing damage and pressure loss of fuel rod position - Google Patents
Single metal positioning grid frame for reducing damage and pressure loss of fuel rod position Download PDFInfo
- Publication number
- CN114220559A CN114220559A CN202111371401.4A CN202111371401A CN114220559A CN 114220559 A CN114220559 A CN 114220559A CN 202111371401 A CN202111371401 A CN 202111371401A CN 114220559 A CN114220559 A CN 114220559A
- Authority
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- China
- Prior art keywords
- spring
- fuel rod
- grid
- single metal
- pressure loss
- 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
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- 239000000446 fuel Substances 0.000 title claims abstract description 53
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 26
- 239000002184 metal Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 7
- 125000006850 spacer group Chemical group 0.000 claims description 14
- 238000005253 cladding Methods 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052759 nickel Inorganic materials 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 230000000712 assembly Effects 0.000 abstract description 4
- 238000000429 assembly Methods 0.000 abstract description 4
- 238000004080 punching Methods 0.000 abstract description 3
- 239000003758 nuclear fuel Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 239000000470 constituent Substances 0.000 description 14
- 239000002826 coolant Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 3
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction 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
- G21C3/352—Spacer grids formed of assembled 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
- G21C3/3432—Grids designed to influence the coolant, i.e. coolant mixing function
-
- 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)
- Fuel Cell (AREA)
Abstract
The invention belongs to the technical field of pressurized water reactor fuel assemblies of nuclear power stations, and particularly discloses a single metal positioning grid for reducing fuel rod position damage and pressure loss, which is of a square grid cell structure and is formed by mutually and vertically inserting and matching two groups of strips, wherein clamping structures are arranged in opposite directions of each grid cell and comprise springs and rigid protrusions; the spring is an arch structure formed by directly punching the surface of the protruding strip by the grid cell strip, and the spring is arranged along the axial direction of the fuel rod. According to the invention, the springs are longitudinally arranged along the grid cells of the grid, and are directly punched and molded from the wall surfaces of the strips, the grid is integrally of a single metal structure, and compared with a double-metal grid, nickel-based spring materials are reduced, the absorption of thermal neutrons can be reduced, the neutron economy of the fuel assembly is improved, and meanwhile, the springs are directly punched and molded, so that the manufacturing process is simplified. The springs are arranged along the axial direction, so that the continuous guide effect is realized in the fuel rod assembling process, and the scratch on the surface of the rod can be reduced.
Description
Technical Field
The invention belongs to the technical field of pressurized water reactor fuel assemblies of nuclear power stations, and particularly relates to a single-metal positioning grid for reducing damage and pressure loss of a fuel rod position.
Background
The nuclear power fuel assembly spacer grids are currently distinguished from bimetallic grids (such as french AFA series assemblies) and monometallic grids (such as westinghouse AP1000 fuel assemblies) in terms of material type. The bimetallic grid takes zirconium alloy as strips and nickel-based alloy as a spring material. The nickel-based alloy has the advantage of high strength, but has the disadvantage of large neutron absorption cross section, which is not favorable for the neutron economy of the fuel assembly. The adoption of the single metal grid is beneficial to the neutron economy of the reactor core and is one of the development directions of the grid. The west room AP1000 assembly grid spring is formed by stamping from the wall surface of the grid element strip, the spring structure is similar to that of an inclined rigid convex, the application of a single metal spring is solved, and the disadvantage is that the fuel rod still meets the edge of the rigid convex in the rod pulling process, and the protection of the rod surface in the rod pulling process is not facilitated. In addition, the resulting spring has a relatively high stiffness, a relatively short spring compression stroke, and a relatively sensitive influence of manufacturing tolerances.
Disclosure of Invention
In view of the above problems, the present invention provides a single metal spacer grid that reduces fuel rod position damage and pressure loss. According to the invention, the springs are longitudinally arranged along the grid cells of the grid, and are directly punched and molded from the wall surfaces of the strips, the grid is integrally of a single metal structure, and compared with a double-metal grid, nickel-based spring materials are reduced, the absorption of thermal neutrons can be reduced, the neutron economy of the fuel assembly is improved, and meanwhile, the springs are directly punched and molded, so that the manufacturing process is simplified.
The invention is realized by the following technical scheme:
a single metal location grid frame for reducing fuel rod position damage and pressure loss is a square grid cell structure and is formed by mutually and vertically inserting and matching two groups of strips, clamping structures are arranged in opposite directions of each grid cell, and each clamping structure comprises a spring and a rigid bulge;
the spring is an arch structure formed by directly punching the surface of the protruding strip by the grid cell strip, and the spring is arranged along the axial direction of the fuel rod.
The spring adopts an arch structure, and the contact surface of the spring and the fuel rod is of an arc surface structure, so that the damage to the surface of the cladding caused by the contact with a sharp edge of the structure in the rod pulling process of the fuel rod is prevented.
Preferably, the arch of the present invention is a single arch.
Preferably, the arch structure of the present invention is a combination of a plurality of arches.
The contact area of the spring and the fuel rod is provided with an area with a certain length, which can be a plane or an arc surface, so that the contact area with the fuel rod is increased, and the contact stress is reduced.
Preferably, the highest point of the arch structure of the invention is provided with a region with the length of 4mm-12mm as the contact region of the spring and the fuel rod.
Preferably, the contact area of the present invention is a flat surface.
Preferably, the contact area of the present invention is an arcuate face that wraps around the fuel rod cladding.
Preferably, both ends of the spring of the invention are respectively provided with an opening. The shape of the opening is one of a circle, an ellipse, an isosceles triangle and a rectangle. According to the invention, through holes are respectively formed at two ends of the spring close to the strip, so that the coolant is allowed to flow, and the blocking area of the coolant is reduced.
The two ends of the spring are connected with the strip, the middle arched part is contacted with the fuel rod, the side surface of the spring is arc-shaped or straight-sided, the width of the upper end and the lower end of the spring is larger, and the width of the middle area of the spring contacted with the fuel rod is smaller; the width of the upper end and the lower end of the spring is smaller, and the width of the middle area of the spring contacting with the fuel rod is larger, or the width of the upper end and the lower end of the spring is the same as the width of the middle area of the spring.
Preferably, the spring of the present invention has an arcuate side profile.
Preferably, the widths of the upper end and the lower end of the spring are larger than the width of the middle area of the spring; or the widths of the upper end and the lower end of the spring are smaller than the width of the middle area of the spring.
Preferably, the side profile of the spring of the present invention is a straight edge.
The invention has the following advantages and beneficial effects:
1. the springs are arranged along the axial direction of the fuel rod, and the surface of the fuel rod is continuously guided in the rod pulling process, so that the friction damage to the surface of the cladding can be reduced.
2. The springs are longitudinally arranged along the grid cells, the cross section of the coolant in the flow is continuously changed, the structural change is less, and the resistance to flow is favorably reduced.
3. The spring is directly punched and molded from the surface of the strip, and the whole grid is of a single metal structure, so that the absorption of thermal neutrons can be reduced, and the neutron economy of the fuel assembly is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic view of the overall structure of a fuel assembly of the present invention.
Figure 2 is a schematic diagram of the lattice structure of the present invention.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a schematic structural diagram of a first embodiment of the spring according to the present invention. Wherein, the right drawing is a side view of the left drawing.
Fig. 5 is a schematic structural diagram of a second embodiment of the spring according to the present invention.
Fig. 6 is a schematic structural diagram of a spring according to a third embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a fourth embodiment of the spring according to the present invention.
Reference numbers and corresponding part names in the drawings:
1-spacer grid, 2-strap, 3-rigid convex, 4-spring, 5-arch, 6-contact area, 7-end area, 8-opening, 9-spring side first embodiment, 10-spring side second embodiment, 11-spring side third embodiment.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides a single metal location grid for reducing damage to a fuel rod position and pressure loss, wherein a clamping structure is formed by mutually perpendicular rigid protrusions and springs in grid cells of the grid, clamping force for the fuel rod is provided, the springs are arranged in the embodiment along the axial direction of the fuel rod, the springs are formed by punching and forming the strip wall directly, and the grid is integrally made of a single metal material and is favorable for neutron economy. The spring adopts the direction of continuous arc structure, reduces to the cladding surface fish tail in the pull rod, and streamlined structure is favorable to reducing the coolant flow resistance simultaneously.
Specifically, as shown in fig. 1-3, the spacer grid 1 of the present embodiment is a square grid cell structure, and is formed by mutually inserting a plurality of straps 2 (the straps located inside the grid are inner straps, and the straps located outside the grid are outer straps).
As shown in fig. 3-4, in the spacer grid of this embodiment, one cell (grid) includes a clamping structure composed of springs 4 and rigid protrusions 3 in opposite directions, the springs 4 directly stamp the surfaces of the protruding strips from the strip of the cell to form an arch structure 5, and the springs 4 are arranged along the axial direction of the fuel rod (i.e. arranged along the longitudinal direction of the grid), i.e. the spacer grid of this embodiment is a single metal structure (single metal zirconium alloy), which can reduce the adverse absorption of nickel-based material to thermal neutrons and improve the neutron economy of the fuel assembly compared to the existing bimetallic grid (grid using nickel-based springs). Meanwhile, the spring is directly punched and formed, and the manufacturing process is simplified. The springs are arranged axially along the fuel rods and are integrally in a continuous arc shape, and when the fuel rods compress the springs, the phase stress can be transferred to the strip parts, so that the stress in the springs is reduced. Meanwhile, the spring has the capacity of bearing force in a larger range due to the axial distribution, the mechanical property of the spring is convenient to change through the adjustment of structural parameters, and the sensitivity to manufacturing errors is reduced.
The arc shape of the spring can continuously guide the rod in the process of assembling and pulling the rod for the fuel rod, and the damage to the surface of the cladding is reduced, and the structure of the side surface 9 of the spring of the embodiment is the arc shape, as shown in fig. 4 in particular, namely, the width of the end areas 7 at the two ends of the spring 4 of the embodiment is larger than the width of the middle contact area 6 of the spring 4.
The spring is contacted with the fuel rod in the middle position, and the contact stress can be flexibly adjusted by adjusting the length of the contact area.
As shown in fig. 4, in this embodiment, a region with a preset length is disposed near the highest point of the arch structure 5, and is used as the contact region 6 between the spring 4 and the fuel rod, and the contact region of this embodiment has a certain length, which may be a plane or an arc surface capable of wrapping the fuel rod, so as to increase the contact area with the fuel rod and reduce the contact stress.
According to the practical requirement, the two end regions 7 of the spring 4 close to the strip are respectively provided with the open holes 8, so that the coolant is allowed to flow, and the blocking area of the coolant is reduced.
Example 2
The present embodiment differs from embodiment 1 only in that the side profile of the spring 4 of the present embodiment is provided in a reverse arc shape, i.e., as shown in fig. 5, the width of both end regions 7 of the spring 4 of the present embodiment is smaller than the width of the middle contact region 6 of the spring 4.
Example 3
The present embodiment differs from embodiment 1 only in that the side profile of the spring 4 of the present embodiment is provided as a straight edge, and specifically, as shown in fig. 6, the width of the end regions 7 at both ends of the spring 4 of the present embodiment is equal to the width of the middle contact region 6 of the spring 4.
Example 4
The present embodiment differs from embodiment 1 only in that the spring 4 of the present embodiment is not perforated at both end regions 7 to increase the stiffness of the spring.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A single metal location grid frame for reducing fuel rod position damage and pressure loss is a square grid cell structure and is formed by mutually and vertically inserting and matching two groups of strips, clamping structures are arranged in opposite directions of each grid cell, and each clamping structure comprises a spring (4) and a rigid bulge (3); the method is characterized in that:
the spring (4) is an arch structure (5) formed by directly stamping the grid cell strips on the surfaces of the protruding strips, and the spring (4) is arranged along the axial direction of the fuel rod.
2. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 1, wherein: the arch structure (5) is a single arch structure.
3. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 1, wherein: the arch structure (5) is a combined structure of a plurality of arches.
4. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 1, wherein: the highest point position of the arch structure (5) is provided with a spring (4) and a contact area (6) of the fuel rod, and the length of the contact area (6) is 4-12 mm.
5. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 4, wherein: the contact area (6) is a flat surface.
6. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 4, wherein: the contact area (6) is an arc-shaped surface wrapping the fuel rod cladding.
7. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 1 or 5, wherein: the upper end and the lower end of the spring (4) are respectively provided with an opening (8), and the shape of each opening (8) is one of a circle, an ellipse, an isosceles triangle and a rectangle.
8. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 1, wherein: the side profile of the spring (4) is arc-shaped.
9. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 1, wherein: the side profile of the spring (4) is a straight edge.
10. The single metal spacer grid for reducing fuel rod site damage and pressure loss of claim 8, wherein: the widths of end regions (7) at the upper end and the lower end of the spring (4) are larger than the width of a middle region of the spring (5);
or the width of the end regions (7) at the upper end and the lower end of the spring (4) is smaller than that of the middle region of the spring (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111371401.4A CN114220559A (en) | 2021-11-18 | 2021-11-18 | Single metal positioning grid frame for reducing damage and pressure loss of fuel rod position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111371401.4A CN114220559A (en) | 2021-11-18 | 2021-11-18 | Single metal positioning grid frame for reducing damage and pressure loss of fuel rod position |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114220559A true CN114220559A (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111371401.4A Pending CN114220559A (en) | 2021-11-18 | 2021-11-18 | Single metal positioning grid frame for reducing damage and pressure loss of fuel rod position |
Country Status (1)
| Country | Link |
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| CN (1) | CN114220559A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115188501A (en) * | 2022-07-07 | 2022-10-14 | 中国核动力研究设计院 | Fuel rod clamping structure and positioning grid |
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| KR20010011647A (en) * | 1999-07-29 | 2001-02-15 | 장인순 | Spacer grid with multi-spring and embossed vane for PWR fuel assembly |
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-
2021
- 2021-11-18 CN CN202111371401.4A patent/CN114220559A/en active Pending
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| CN115188501A (en) * | 2022-07-07 | 2022-10-14 | 中国核动力研究设计院 | Fuel rod clamping structure and positioning grid |
| CN115188501B (en) * | 2022-07-07 | 2024-02-06 | 中国核动力研究设计院 | Fuel rod clamping structure and positioning grid |
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Application publication date: 20220322 |