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Method and device for positioning fuel rods in fuel assembly or fuel rod storage container

A fuel assembly and storage container technology, applied in nuclear power generation, climate sustainability, moderator/core structure, etc., can solve problems such as dense arrangement, difficulty in precise positioning of fuel rods, and small fuel rods

Active Publication Date: 2012-02-01
QINSHAN NUCLEAR POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During fuel assembly installation, disassembly, inspection, repair, and fuel rod storage and transportation, it is possible to grab and insert fuel rods. The operation of the fuel rods of the fuel assembly needs to be operated remotely under water, so it is very difficult to accurately locate the fuel rods

Method used

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  • Method and device for positioning fuel rods in fuel assembly or fuel rod storage container
  • Method and device for positioning fuel rods in fuel assembly or fuel rod storage container
  • Method and device for positioning fuel rods in fuel assembly or fuel rod storage container

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Such as figure 1 As shown, the fuel assembly of a certain power plant is closely arranged 15×15 symmetrically distributed cells, a total of 225 cells, all of which are square, and the side length of the cells is approximately equal to (slightly larger than) the cross-sectional diameter of the fuel rod.

[0071] 204 fuel rods are placed in 204 fuel rod cells 1, and 21 conduits are placed in the remaining 21 conduit cells 2. The 204 fuel rod cell-1 positions meet the requirements of every 90° rotation around the center of symmetry, and the 204 fuel rod cell-1 positions coincide with the previous ones.

[0072] The fuel rod cell-1 of 204 fuel assemblies is positioned using the method and device of the present invention, specifically as follows:

[0073] (1) Install a positioning plate above the fuel assembly or fuel rod storage container. The length and width of the positioning plate are equal to the total length and width of the symmetrically distributed cells of 15×15....

Embodiment 2

[0087] Such as image 3 As shown, the fuel rod storage container of a certain power plant is closely arranged 14×14 symmetrically distributed cells, a total of 196 cells, all of which are square, and the side length of the cell is approximately equal to (slightly larger than) the cross-sectional diameter of the fuel rod.

[0088] The 132 fuel rods are placed in the 132 fuel rod cell 2 4, and the remaining cells are blank areas 5. The positions of the 132 fuel rod cell 2 4 satisfy every rotation 90° around the center of symmetry, and the 132 fuel rod cell 2 4 Same position as before.

[0089] The fuel rod cell 2 4 of the 132 fuel rod storage containers is positioned using the method and device of the present invention, as follows:

[0090] (1) Install a positioning plate above the fuel assembly or fuel rod storage container. The length and width of the positioning plate are equal to the total length and width of the 14×14 symmetrically distributed cells. There are 33 position...

Embodiment 3

[0104] Such as figure 1 As shown, the fuel assembly of a certain power plant is closely arranged 15×15 symmetrically distributed cells, a total of 225 cells, all of which are square, and the side length of the cells is approximately equal to (slightly larger than) the cross-sectional diameter of the fuel rod.

[0105] 204 fuel rods are placed in 204 fuel rod cells 1, and 21 conduits are placed in the remaining 21 conduit cells 2. The 204 fuel rod cell-1 positions meet the requirements of every 90° rotation around the center of symmetry, and the 204 fuel rod cell-1 positions coincide with the previous ones.

[0106] Such as figure 2 As shown, the positioning device of the present invention is a positioning plate installed above the fuel assembly or fuel rod storage container. There are 51 positioning circular holes-3 on the board, the diameter of each positioning circular hole-3 is 2.5 times the cross-sectional diameter of the fuel rod, and the center-to-center distance of a...

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Abstract

The invention provides a method and a device for positioning fuel rods in a fuel assembly or a fuel rod storage container. The method comprises the following steps of: arranging a positioning plate above the fuel assembly or the fuel rod storage container, wherein the positioning plate is provided with q positioning circular holes; and rotating the positioning plate anticlockwise or clockwise for90 degrees, 180 degrees and 270 degrees around an origin, and installing the positioning plate for four times, so that all lattice cells for holding the fuel rods can be positioned, wherein the lattice cells are only positioned once. The device is the positioning plate arranged above the fuel assembly or the fuel rod storage container, the positioning plate is provided with q positioning circular holes, the diameter of each positioning circular hole is 1.5 to 2.5 times that of the cross section of the fuel rod, and the center distance between the adjacent positioning circular holes is 2 times that of the adjacent lattice cells. Because the positioning plate is provided with the positioning holes, the purposes of accurately positioning the fuel rods, facilitating the operation and reducing the operation error rate are fulfilled by calculating the distribution of the positioning holes.

Description

technical field [0001] The invention relates to a method and a device for positioning fuel rods in a fuel assembly or a fuel rod storage container, in particular to a method and a device for screening and accurately positioning fuel rods from a fuel assembly or a fuel rod storage container distributed in symmetrical cells. Background technique [0002] The PWR fuel assembly framework distributes several positioning grids along the length direction, and each layer of grids is divided into several cells by vertically intersecting strips, and fuel rods are inserted into these cells. The fuel assembly frame also includes guide tubes, which replace fuel rods and are inserted into some cells of the spacer grid to ensure that the spacer grid is fixed at positions distributed along the length of the fuel assembly guide tubes. These fuel rods and conduits are densely arrayed together with the spacer grid and the upper and lower tube sockets to form the fuel assembly. [0003] When o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C5/06
CPCY02E30/40Y02E30/30
Inventor 马明泽陈梁何少华李涛戚宏昶薛新才
Owner QINSHAN NUCLEAR POWER
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