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Method for measuring lengths of multiple kinds of enriched uranium pellet columns in nuclear rods

A technology for nuclear fuel rods and fuel rods, which is used in nuclear engineering, nuclear power generation, nuclear reactor monitoring, etc., can solve the problem of inability to detect the length of natural uranium pellets, and achieve the effect of meeting measurement requirements and solving inability to measure

Active Publication Date: 2017-07-07
CNNC JIANZHONG NUCLEAR FUEL
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  • Abstract
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Problems solved by technology

[0003] The technical problem to be solved in the present invention is: the existing detection method cannot detect the length of the natural uranium pellet column

Method used

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  • Method for measuring lengths of multiple kinds of enriched uranium pellet columns in nuclear rods
  • Method for measuring lengths of multiple kinds of enriched uranium pellet columns in nuclear rods
  • Method for measuring lengths of multiple kinds of enriched uranium pellet columns in nuclear rods

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Embodiment Construction

[0018] The present invention is a method for measuring the lengths of multiple enriched uranium pellet columns in nuclear fuel rods, which is designed and manufactured such as figure 1 The shown TVS-2M standard rod of the length of the natural uranium pellet column in the fuel rod is filled with different lengths of natural uranium pellets in a variety of standard rods, and the different enriched uranium cores can be distinguished by gamma-ray energy spectrometry The gamma ray intensity emitted in the block is used to distinguish different enriched uranium pellet column regions according to the difference in γ ray intensity, and the gamma count value of different pellet column regions is automatically found through the developed computer software. The curve equation can be obtained by fitting the measured data of natural uranium pellet columns with different lengths in the standard rod, as long as the count value measured in the tested fuel rod is compared with the gamma count ...

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Abstract

The invention belongs to the technical field of fuel assemblies and particularly relates to a method for measuring lengths of multiple kinds of enriched uranium pellet columns in nuclear rods. The method includes the specific steps of manufacturing a standard rod, determining a gamma count value, performing data fitting and detecting actually. The method solves the technical problem that an existing measurement method fails to measure the lengths of the natural uranium pellet columns, is capable of measuring the lengths of the natural uranium pellet columns through a gamma-ray energy spectrum measurement method, solves the problem that a gamma absorption method fails to measure and meets the requirements on measuring the lengths of the natural uranium pellet columns in the TVS-2M fuel rods.

Description

technical field [0001] The invention belongs to the technical field of fuel assemblies, and in particular relates to a method for measuring the lengths of various enriched uranium pellet columns in nuclear fuel rods. Background technique [0002] In the new fuel assembly, the two ends of the enriched uranium pellet column in the fuel rod are required to be filled with a certain length of natural uranium pellets, and the length of the pellet column is clearly specified in the technical requirements. Therefore, it is necessary to 100% check its assembly quality and measure the length of the natural uranium pellet column in the manufacturing process of the fuel rod. The original measurement method γ-ray absorption method can detect the length of all the pellet columns in the fuel rod, but it cannot distinguish the length of the pellet columns in different enrichment degrees or multiple enriched uranium regions in the fuel rod. The absorption coefficient of the pellets is the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/10
CPCG21C17/10Y02E30/30
Inventor 宋磊李阵德杨森刘学镭承帆
Owner CNNC JIANZHONG NUCLEAR FUEL
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