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Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver

A passive monitoring and feeding hopper technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems that personnel cannot approach monitoring and high radioactivity levels

Pending Publication Date: 2022-03-08
CHINA NUCLEAR POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the overall closure of the dissolver and the extremely high level of radioactivity, personnel cannot approach and use conventional methods for monitoring

Method used

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  • Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver
  • Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver
  • Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver

Examples

Experimental program
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Effect test

Embodiment 1

[0064] During the feeding process of the dissolver, the fuel rod is cut into several fuel short sections with a length of about 20-50mm by a shearing machine, such as figure 1 and image 3 As shown, the fuel short section falls into the dissolver bucket along the chute.

[0065] This embodiment provides a passive monitoring method for the blockage of the spent fuel dissolver feed hopper, including:

[0066] S1: Install the first detection system 1 near the top of the feed hopper chute 41 of the spent fuel dissolver 4, and install the second detection system 2 near the bottom of the feed hopper chute 41 of the spent fuel dissolver 4,

[0067] S2: When the spent fuel dissolver 4 feeds, the first detection system 1 detects the gamma rays emitted by the short fuel rods passing through the top of the feed hopper chute 41, and obtains the pulse count corresponding to the set energy range of the gamma rays entering it Rate N 1 ; The second detection system 2 detects the gamma rays...

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Abstract

The invention provides a passive monitoring method and system for blockage of a feed hopper of a spent fuel dissolver, and the method comprises the steps: arranging detection systems at the positions close to the top and bottom of a chute of the feed hopper of the spent fuel dissolver; the two detection systems respectively detect gamma rays emitted by the fuel short rods passing through the top and the bottom of the chute of the feed hopper, and respectively obtain corresponding pulse counting rates N1 and N2 of the gamma rays entering the detection systems in a set energy interval; the number n1 of the short fuel rods passing through the top of the chute of the feed hopper is calculated according to the pulse counting rate N1, the number n2 of the short fuel rods passing through the bottom of the chute of the feed hopper is calculated according to the pulse counting rate N2, and when the difference value between the n1 and the n2 is larger than a set value, blockage of the feed hopper of the spent fuel dissolver can be accurately judged.

Description

technical field [0001] The invention specifically relates to a method and system for passively monitoring the clogging of a spent fuel dissolver feed hopper. Background technique [0002] The passive monitoring device for the blockage of the spent fuel dissolver feed hopper is the key equipment to ensure the normal operation of the spent fuel dissolver. In the spent fuel reprocessing process, the fuel rods are cut into several short pieces of fuel with a length of about 20-50mm, which enter one of the 14 buckets in the dissolver through the chute. Subsequently, the dissolver rotates counterclockwise to fully dissolve the fuel in the short section of fuel in the bucket in the nitric acid solution, and then move out of the dissolver through the discharge chute. [0003] Since the spent fuel dissolver contains a large amount of radioactive substances, in order to ensure the safety of the dissolution process, it is necessary to carry out blockage monitoring of the dissolver fee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/00
CPCG01V5/00Y02E30/30
Inventor 齐宇虹刘伟容苏家豪王欣张伟贺施政王平赵庆彬胡锡文阚琛宋晓鹏李光俊刘忠亮
Owner CHINA NUCLEAR POWER ENG CO LTD
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