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A kind of preparation method of uo2 fuel pellet

A fuel pellet and feeding technology, which is applied in the manufacture of reactors, greenhouse gas reduction, climate sustainability, etc., can solve the problems of affecting the efficiency of production and research, high pellet processing cost, and large pellet processing volume. Achieve the effect of good surface finish, less grinding process and high forming efficiency

Active Publication Date: 2022-03-22
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the face of new design shapes or hollow UO2 fuel pellets, the processing volume of the pellets obtained by pressing is large, the processing cost of the pellets is high, and the pellets are fragile when processing the tip or thin parts, which seriously affects production and research. s efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation method of a kind of UO fuel pellet provided by this embodiment, comprises the following steps:

[0021] Step 1. Preparation of feed

[0022] First restore the processed UO 2 The powder is sieved to obtain a powder with a particle size of 10-200 μm. The binder adopts a polypropylene-paraffin-polystyrene-stearic acid system. The loading amount of the powder in the feed is 48vol%. The binder ratio selection: poly Propylene PP (30%) + Paraffin PW (35%) + Polystyrene PS (25%) + Stearic acid SA (10%). The preparation of the feed is carried out in an internal mixer, adding polystyrene and polypropylene, then paraffin and stearic acid at a temperature of about 170 ° C, and finally adding UO 2 powder until mixing is complete.

[0023] Step 2. Injection molding process

[0024] After pelletizing, the mixed feed is injected on an injection molding machine, and the injection temperature (190-220°C) and injection pressure (60-90MPa) are adjusted to obtain hollow ...

Embodiment 2

[0030] The preparation method of a kind of UO fuel pellet provided by this embodiment, comprises the following steps:

[0031] Step 1. Preparation of feed

[0032] will restore the processed UO 2 The powder is sieved to obtain a powder with a particle size of 10-200 μm. The binder adopts a polypropylene-paraffin-polystyrene-stearic acid system. The loading amount of the powder in the feed is 52vol%. The binder ratio selection: poly Propylene PP (35%) + Paraffin PW (40%) + Polystyrene PS (20%) + Stearic acid SA (5%). The preparation of the feed was carried out on an internal mixer, maintaining the temperature of 170°C by adding polystyrene and polypropylene, then paraffin and stearic acid, and finally adding UO 2 powder until mixing is complete.

[0033] Step 2. Injection molding process

[0034] After the mixed feed is granulated, in the injection molding machine, adjust the injection temperature (190-220°C) and the injection pressure (60-90MPa) to obtain hollow UO 2 Inje...

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Abstract

The invention belongs to the technical field of nuclear fuel manufacture, and in particular relates to a method for preparing UO2 fuel pellets. The invention comprises the following steps: step 1, preparation of feeding material; step 2, injection molding process; step 3, solvent degreasing; step 4, degreasing and sintering. The invention can realize high-efficiency near-net shape of fuel pellets, reduce cost, obtain uniform density, high dimensional accuracy and high surface finish, and be flexibly applied in new fuel design research.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel manufacturing, in particular to a method for preparing UO2 fuel pellets. Background technique [0002] Currently UO 2 The preparation of fuel pellets is generally carried out by powder metallurgy. 2 The powder is screened, pressed, sintered, and then processed by grinding to obtain pellets of specified size. However, in the face of newly designed shape or hollow UO2 fuel pellets, the pellets obtained by pressing have a large processing volume and high processing cost. The pellets are fragile when processing the tip or thin parts, which seriously affects production and research s efficiency. [0003] Ceramic injection molding combines plastic injection molding and powder metallurgy technology. After injection molding, ceramic powder is mixed with polymer binder to realize polymer-coated powder particles, which can have good rheology under injection temperature and pressure, and then fill th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/02
CPCG21C21/02Y02E30/30
Inventor 张翔潘小强杨静许奎张雨
Owner NUCLEAR POWER INSTITUTE OF CHINA
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