Positioning device for accurately positioning fuel rod replacing tool on extracted fuel rod

A technology of accurate positioning and positioning device, which is applied in the fields of reactor fuel elements, nuclear engineering, reactors, etc., can solve the problem of difficulty in precise positioning of fuel rods, reduce the difficulty of positioning and operation, reduce the probability of errors, and reduce the risk of damage Effect

Active Publication Date: 2013-06-26
QINSHAN NUCLEAR POWER
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  • Claims
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Problems solved by technology

[0004] In the process of fuel assembly repair, fuel rods need to be grasped and inserted. However, due to the small diameter of the fuel rod ends and dense arrangement, and the operation of spent fuel assemblies needs to be operated remotely under water, so It is very difficult to precisely locate the fuel rods

Method used

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  • Positioning device for accurately positioning fuel rod replacing tool on extracted fuel rod
  • Positioning device for accurately positioning fuel rod replacing tool on extracted fuel rod
  • Positioning device for accurately positioning fuel rod replacing tool on extracted fuel rod

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Embodiment Construction

[0038] A positioning device for accurately positioning the fuel rod replacement tool on the extracted fuel rod according to the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] like figure 1 The fuel assembly of a certain power plant shown is a cell distributed in a 15×15 array,

[0040] A neutron flux measuring tube 8 is placed in the center of the cells distributed in a 15×15 array, a=15 (an odd number);

[0041]The 204 fuel rods 9 are respectively placed in the cells distributed in a 15×15 array; the positions of the 204 fuel rods in the cells distributed in a 15×15 array meet the requirements for each rotation of 90° around the symmetric center of the cells, and the 204 fuel rods are placed in The positions in the cells distributed in the 15×15 array coincide with those before;

[0042] Another 20 control rod guide tubes 7 are also respectively placed in the cells distributed in the 15×15 a...

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Abstract

The invention provides a positioning device for accurately positioning a fuel rod replacing tool on an extracted fuel rod. The positioning device comprises a positioning plate matched with the length and the width of lattice cells distributed in a*a array, and the positioning plate is provided with p positioning holes. The number of the positioning holes is 1 / 4 of the number of the fuel rods; andafter each installation, the 1 / 4 fuel rods can be accurately positioned, all the fuel rods are installed for four times to finally cover all the fuel rod lattice cells, and the positioning times of each fuel rod is only one times. By adjusting different installation directions of the positioning plate in the positioning device, the fuel rod replacing tool is accurately positioned on the extractedfuel rod, and the purpose of accurate positioning is fulfilled.

Description

technical field [0001] The invention relates to a positioning device in the fuel assembly repair process of a pressurized water reactor nuclear power plant, in particular to a positioning device for accurately positioning a fuel rod replacement tool on an extracted fuel rod. Background technique [0002] During the refueling process of nuclear power plants, it is sometimes found that the reusable fuel rods are damaged and the fuel assembly positioning grid coamings are damaged to varying degrees. Both refueling and overhaul schedules have a significant impact. Therefore, it is necessary to carry out underwater repair of damaged fuel assemblies after irradiation. During this process, various operations such as disassembly and assembly of the end cover of the tipping basket, disassembly and assembly of the lower nozzle of the damaged fuel assembly after irradiation, and insertion and removal of fuel rods are required. [0003] The PWR fuel assembly framework distributes seve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/334
CPCY02E30/40Y02E30/30
Inventor 陈梁何少华李涛戚宏昶聂文哲范伟丰
Owner QINSHAN NUCLEAR POWER
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