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Preparation process of cobalt pellets in cobalt regulating rod assembly

A technology of cobalt regulating rod and preparation process, which is applied in the field of manufacturing nuclear fuel elements, and can solve problems such as high impurity content, low production efficiency, and complicated preparation process

Active Publication Date: 2011-03-30
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additives, such as polyvinyl alcohol or paraffin, etc., lead to high impurity content after sintering, and due to the complicated preparation process of cold and other green bodies, resulting in
Makes production inefficient and not suitable for mass production of components

Method used

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  • Preparation process of cobalt pellets in cobalt regulating rod assembly
  • Preparation process of cobalt pellets in cobalt regulating rod assembly

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Embodiment 3

[0054] The cobalt pellet green body detected by the surface quality is placed in a vacuum atmosphere sintering furnace for pellet sintering. in H2

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Abstract

The invention relates to the manufacturing technology of nuclear fuel elements, in particular to a preparation process of pellets in cobalt regulating rod assemblies used in nuclear reactors. The process of the invention comprises the following steps: (1) powder granulation; (2) powder molding; (3) pellet sintering; (4) pellet degassing and sintering. The aspect ratio of the cobalt pellets produced by the process of the present invention is greater than 4, and the hydrogen impurity content is less than 1 μg / g, which meets the preparation requirements of high aspect ratio, high density, and defect-free cobalt pellets, and meets the requirements of the cobalt regulating rod assembly in the reactor. The technical requirements of the work are suitable for batch preparation.

Description

The preparation process of cobalt pellets in cobalt regulating rod assembly technical field The present invention relates to the manufacture technology of nuclear fuel element, be specifically related to a kind of nuclear reactor core with cobalt regulating rod assembly Block preparation process. Background technique Use cobalt regulating rod to replace stainless steel regulating rod in nuclear reactor, capture neutron by cobalt-59 and obtain cobalt-60 radioactive source. The cobalt-59 pellet is the core part of the cobalt regulating rod assembly, and its quality directly affects the yield of the radioactive source and the safety of the reactor and other issues. Cobalt pellet has its special requirement: cobalt pellet size is diameter Φ 6.22mm ± 0.02mm, height 25.1mm±0.05mm, belonging to high aspect ratio; density of cobalt pellets is 8.55~8.65g / cm 3 , the density control range is narrow; the total cobalt content ≥ 99.7%, the total amount of impurities ≤ 0.3%,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/04
CPCY02E30/30
Inventor 田春雨王玉敏聂皓张宇陈连重马春英魏晨光
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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