Monometallic positioning grillwork for reducing fuel rod position damage and pressure loss

A spacer, single-metal technology, applied in the assembly of fuel elements, reactor fuel elements, reduction of greenhouse gases, etc., can solve the problems of high spring stiffness, unfavorable rod surface protection, short spring compression stroke, etc., to reduce absorption, The effect of improving neutron economy and reducing drag

Pending Publication Date: 2022-03-22
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Westinghouse AP1000 component lattice spring is punched and formed from the cell strip wall. The spring structure is similar to the inclined rigid convex, which solves the application of single metal spring. The disadvantage is that the rigid convex edge is still encountered in the process of pulling the fuel rod. Conducive to the protection of the surface of the rod during the rod drawing process
In addition, the stiffness of the resulting spring is relatively large, the spring compression stroke is short, and the influence of manufacturing tolerances is relatively sensitive

Method used

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  • Monometallic positioning grillwork for reducing fuel rod position damage and pressure loss
  • Monometallic positioning grillwork for reducing fuel rod position damage and pressure loss
  • Monometallic positioning grillwork for reducing fuel rod position damage and pressure loss

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Experimental program
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Effect test

Embodiment 1

[0040] This embodiment proposes a single metal positioning grid that reduces fuel rod damage and pressure loss. The grid cell is composed of mutually perpendicular rigid protrusions and springs to form a clamping structure to provide clamping force for fuel rods. In the embodiment, by arranging springs along the axial direction of the fuel rods, and the springs are directly punched and formed from the wall surface of the strip, the entire grid is made of a single metal material, which is beneficial to neutron economy. The spring is guided by a continuous arc structure to reduce scratches on the cladding surface in the pull rod, and the streamlined structure is conducive to reducing the flow resistance of the coolant.

[0041] Specific as Figure 1-3 As shown, the positioning grid 1 of this embodiment is a square cell structure, and several strips 2 (the strips located inside the grid are inner strips, and the conditions outside the grid are outer strips) are mated with each ot...

Embodiment 2

[0048] The only difference between this embodiment and Embodiment 1 is that the side profile of the spring 4 of this embodiment is set as a reverse arc, that is, as Figure 5 As shown, the width of the two end regions 7 of the spring 4 in this embodiment is smaller than the width of the middle contact region 6 of the spring 4 .

Embodiment 3

[0050] The only difference between this embodiment and Embodiment 1 is that the side profile of the spring 4 of this embodiment is set to a straight edge, specifically as Figure 6 As shown, the width of the two end regions 7 of the spring 4 in this embodiment is equal to the width of the middle contact region 6 of the spring 4 .

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Abstract

The invention belongs to the technical field of nuclear power station pressurized water reactor fuel assemblies, and particularly discloses a single-metal positioning grillwork for reducing fuel rod position damage and pressure loss, the single-metal positioning grillwork is of a square lattice cell structure and is formed by vertically inserting two groups of strips, a clamping structure is arranged in the opposite direction of each lattice cell, and each clamping structure comprises a spring and a rigid bulge; the spring is of an arch structure formed by directly stamping lattice cell strips and protruding out of the surfaces of the strips, and the spring is arranged in the axial direction of the fuel rod. The springs are longitudinally arranged along the lattice cells of the grillwork, the springs are directly punched and formed from the wall surfaces of the strips, the whole grillwork is of a single-metal structure, compared with a double-metal grillwork, nickel-based spring materials are reduced, absorption of thermal neutrons can be reduced, the neutron economy of the fuel assembly is improved, meanwhile, the springs are directly punched and formed, and the manufacturing process is simplified. The springs are arranged in the axial direction, the continuous guiding effect is achieved in the fuel rod assembling process, and scratches to the surfaces of the rods can be reduced.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant pressurized water reactor fuel assemblies, and in particular relates to a single metal positioning grid for reducing fuel rod position damage and pressure loss. Background technique [0002] At present, nuclear power fuel assembly positioning grids are divided into bimetallic grids (such as French AFA series components) and single metal grids (such as Westinghouse AP1000 fuel assemblies) in terms of material types. The bimetallic grid uses zirconium alloy as the strip and nickel-based alloy as the spring material. The advantage of nickel-based alloys is high strength, but the disadvantage is that the neutron absorption cross section is large, which is not conducive to the neutron economy of fuel assemblies. The use of a single metal grid is beneficial to the neutron economy of the core, and is one of the development directions of the grid. Westinghouse AP1000 component lattice spring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/352G21C3/34
CPCG21C3/352G21C3/3432Y02E30/30
Inventor 雷涛焦拥军陈杰陈平郑美银彭园李权李垣明黄永忠任全耀蒲曾坪韩元吉邱玺
Owner NUCLEAR POWER INSTITUTE OF CHINA
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