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Recycling method for MOX pellets

A technology of pellets and fuel pellets, which is applied in the field of MOX pellet recycling and reuse, can solve the problems of single treatment method of unqualified pellets and so on.

Active Publication Date: 2019-05-07
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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  • Summary
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for recycling and reusing MOX pellets, which solves the problem of a single processing method for unqualified pellets and realizes the recovery of unqualified pellets. Reasonable use

Method used

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Embodiment Construction

[0016] A method for recycling MOX pellets, comprising the following steps:

[0017] Step 1: Select MOX fuel pellets, analyze and test their appearance, size, uranium and plutonium content, impurity content, O / M, and density data.

[0018] Step 2: Pellets whose O / M is not between 1.90 and 1.99 are regarded as unqualified pellets. Put the pellets into the quartz sintering boat, and then put the sintering boat into the sintering furnace; pump the air pressure in the furnace To 0.01~5.00Pa, pass Ar+%H at a speed of 0.1~15.0L / min 2 , choose a mixed gas with a H2 content of 0.1-10.0%, keep the air pressure between 8-18KPa, do this reciprocating operation 1-10 times, the oxygen potential is -800--150KJ / mol, the dew point is -50-0°C, H 2 The O content is 10-1000ppm; the temperature in the sintering furnace is raised at a rate of 0.1-10°C / min, and kept at 600-1500°C for 0.5-48 hours, the air pressure is kept between 1-14KPa, and the gas flow control speed is 0.1- 35L / min, oxygen pote...

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Abstract

The invention provides a recycling method for MOX pellets. The method comprises the following steps: step 1, selecting MOX fuel pellets, and analyzing and detecting appearances, sizes, uranium plutonium contents, impurity contents, O / M and density data; step 2, recycling pellets with unqualified O / M; step 3, recycling pellets with unqualified densities; step 4, recycling pellets with unqualified outer diameters; and step 5, recycling pellets with a plurality of unqualified indexes.

Description

technical field [0001] The invention belongs to the field of recovery and reuse, and in particular relates to a method for recovery and reuse of MOX pellets. Background technique [0002] During the MOX green body pressing and pellet sintering process, a certain amount of unqualified pellets are produced due to unsatisfactory parameters such as material fluidity, material physical and chemical properties, and sintering process. In order to improve the product qualification rate, unqualified pellets need to be processed Recycle. [0003] At present, in the field of traditional nuclear fuel manufacturing, unqualified products are mainly processed by container storage. There are three shortcomings. First, the storage of unqualified pellets leads to low utilization of uranium and plutonium materials; The manufacturing cost of pellets is high; the third is that the accumulated pellets will cause radiation damage to equipment and personnel. In order to solve these problems, this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/28G21F9/30
CPCY02E30/30
Inventor 艾利君陈永红杨廷贵周国梁潘传龙张顺孝郭亮
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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