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Positioning trellis with hooking risk reduction function for nuclear fuel component

A technology for nuclear fuel components and positioning grids, which is applied in the direction of reactor fuel elements, assembly of fuel elements, nuclear engineering, etc. It can solve problems such as damage to positioning grids, achieve enhanced bending resistance, and avoid corner position strips The effect of highlighting and reducing the risk of hooking

Active Publication Date: 2015-04-22
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the refueling of nuclear power plants, it often happens that the spacer grid hooks are damaged

Method used

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  • Positioning trellis with hooking risk reduction function for nuclear fuel component
  • Positioning trellis with hooking risk reduction function for nuclear fuel component
  • Positioning trellis with hooking risk reduction function for nuclear fuel component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 , 2 , 3 and 4, the positioning grid involved in the present invention is composed of several strips that are orthogonally mated to each other, and is welded and fixed at two places above and below the intersection position to form a square fuel rod cell 2; when it can be clearly indicated On the premise of showing the structural relationship, for the sake of simplicity, the above figure 1 , 2 , 3 and 4 show the part of the positioning grid; the strips located inside and outside are respectively the inner strip 1 and the outer strip 3, and the upper and lower ends of the outer strip 3 are continuously provided with inwardly curved The folded guide wings 5 ​​are arranged continuously to form a continuous guiding effect and prevent the components from being hooked during the hoisting process.

[0022] In order to strengthen the bending resistance of the guide wing 5, the two ends of the inner strip 1 in the present invention are provided with a guide wi...

Embodiment 2

[0024] Because the height of the guide wings at the splicing position of the outer strips of the existing positioning grid is the same as the guide wings at other positions, due to manufacturing errors, the guide wings at the splicing position of the outer strips will protrude from the surface of the grid, increasing the hooking of the grid risk, in order to overcome this defect, this embodiment is optimized on the basis of embodiment 1, such as Figure 5 As shown, the height of the guide wings 5 ​​at the joint of two adjacent outer strips 3 is lower than that of the guide wings 5 ​​at other positions, and the value range of the height difference L between the two is 0.1 mm to 3.0 mm; The height of the guide vane 5 at the position is lower than that of the guide vanes 5 at other positions, so that even if there is an assembly deviation in the manufacturing process, the two half guide vanes are misaligned. In this case, the spliced ​​guide vanes can also be guaranteed 5. Do not...

Embodiment 3

[0026] Since the positions where the outer strips of the traditional positioning grid are spliced ​​with each other are set at the corners of the grid that are prone to hooking, in order to reduce the risk of hooking, this embodiment is optimized on the basis of Embodiment 1 or 2. The splicing position of the outer strips 3 is adjusted from the corner of the grid to a position close to the middle. In this embodiment, the joint of the two adjacent outer strips 3 is located at the nth fuel rod cell of the positioning grid 2 positions, and n>2, so as to avoid the protruding strips at the corners caused by component rotation or position deviation during the hoisting operation, and reduce the risk of grid hooking.

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PUM

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Abstract

The invention discloses a positioning trellis with a hooking risk reduction function for a nuclear fuel component. The positioning trellis comprises a plurality of strips which are perpendicularly inserted and matched to form a plurality of fuel rod lattice cells, the strips inside and at the periphery are respectively inner strips and outer strips; inwardly bent guiding wings are continually arranged at the upper and the lower ends of the outer strips; and two ends of the inner strips protrude up and down to form guiding wing support structures; the guiding wing support structures are propped against the inner sides of the guiding wings in the corresponding positions to form an integral structure through fixation. According to the invention, the guiding wings at the splicing positions of the outer strips are lower than the guiding wings at other positions, so that the guiding wings at the splicing positions are prevented from protrusion; the overlapping positions of the outer strips of the trellis are at the periphery and close to the middle, so that corners are prevented from protruding to result in hooking damage; and the guiding wings of the outer strips and the support structures at the end parts of the inner strips are connected through welding, so that the bending resistance of the guiding wings is enhanced.

Description

technical field [0001] The invention relates to the design field of a positioning grid for fuel assemblies of a pressurized water reactor of a nuclear power plant, in particular to a positioning grid for nuclear fuel assemblies that reduces the risk of hooking. Background technique [0002] The nuclear power plant pressurized water reactor fuel assembly is composed of a number of fuel rods, guide tubes, positioning grids and upper and lower tube sockets. The basic function of the spacer grid is to clamp and position fuel rods to maintain a proper distance between adjacent fuel rods and between fuel rods and guide tubes. However, during the refueling of nuclear power plants, it often occurs that the hooks of the spacer grids are damaged. Contents of the invention [0003] The object of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a spacer grid that reduces the risk of hooking during the fuel assembly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/34G21C3/352G21C3/356
CPCY02E30/40Y02E30/30
Inventor 雷涛彭园张世权陈杰程华旸焦拥军肖忠庞华张林
Owner NUCLEAR POWER INSTITUTE OF CHINA