A kind of preparation method of porous fuel core inert matrix dispersed fuel pellets

A technology for disperse fuel and core material, applied in the fields of reactor fuel material, nuclear engineering, nuclear power generation, etc., can solve the problem of insufficient uranium abundance in inert-based disperse fuel pellets, and achieve the improvement of neutron economy, high temperature and radiation. The effect of illumination stability and reduction of post-processing costs

Active Publication Date: 2019-08-09
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of insufficient uranium abundance in the inert-based dispersed fuel pellets prepared in the prior art, the present invention provides a method for preparing porous fuel core inert-based dispersed fuel pellets

Method used

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Embodiment

[0032] The purpose of this example is to provide a method for preparing porous fuel core inert-based dispersed fuel pellets, which replaces the TRISO particles in the existing pellets with porous fuel cores, increasing the uranium abundance in the pellets by more than four times , can also significantly improve the neutron economy of the fuel pellets, reduce the cost of power plant operation and spent fuel reprocessing, and can also greatly shorten the process cycle, realize the batch preparation of the pellets, significantly reduce the production cost, and the prepared The inert-based dispersed fuel pellets have higher density, smaller grain size, fewer structural defects, and better high-temperature stability and radiation resistance.

[0033] The preparation method mainly includes several steps of preparation of porous fuel core pellets → preparation of inert matrix slurry → preparation of composite particles → pressing core → pressing core shell → preparation and molding; w...

example 1

[0036] (1) Preparation of porous fuel core pellets: After fully mixing uranium dioxide and ammonium oxalate with a particle size of 100nm~200μm in a mass ratio of 1:2, a mixed powder is obtained; the mixed powder is pressed to a density of 40% green body, then crushed into mixture particles with a particle size of 0.5~2mm, and then put the mixture particles into a container for rolling and grinding for 5 hours to obtain mixture pellets, and finally pre-fire the pellets at a low temperature of 500°C 4h, obtain the porous fuel core pellet after removing the pore-forming agent;

[0037] (2) Preparation of inert matrix slurry: fully mix ceramics (silicon carbide) with a particle size of 20nm and ethanol at a weight ratio of 1:2 for 20 hours to obtain a slurry of inert matrix materials;

[0038] (3) Preparation of composite particles: put the porous fuel core pellets obtained in step (1) into a heatable drum, open the drum, and control the heating temperature at 70°C to make the po...

example 2

[0043] (1) Preparation of porous fuel core pellets: After fully mixing uranium carbide with a particle size of 50 μm and ammonium oxalate at a mass ratio of 1:6, a mixed powder is obtained; the mixed powder is pressed into a billet with a density of 70% After the body is pre-fired at a low temperature of 800°C for 0.5h, and the pore-forming agent is removed, the fuel core porous calcined body is obtained, and then the pre-fired body is broken into fuel core porous particles with a particle size of 0.5mm, and then the porous fuel core is obtained. The particles are put into the container for 24 hours of tumbling grinding and spheroidizing, and the porous fuel core pellets can also be obtained;

[0044] (2) Preparation of inert matrix slurry: fully mix zirconium carbide with a particle size of 50 μm and absolute ethanol at a weight ratio of 1:1.5 for 18 hours to obtain an inert matrix slurry;

[0045] (3) Preparation of composite particles: put the porous fuel core pellets obtai...

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Abstract

The invention discloses a preparation method of a porous-fuel-core inert matrix dispersion fuel pellet. The preparation method mainly comprises the steps of preparation of porous fuel core beads, preparation of inert matrix slurry, preparation of composite particles, pressing of a core, pressing of a core shell and preparation forming. According to the method, TRISO particles in an existing pellet is replaced with a porous fuel core, so that uraniumu abundance in the pellet is improved by four times or more, neutron economy of the fuel pellet can also be obviously improved, and power station operation cost and spent fuel reprocessing cost are reduced; moreover, a process period can also be greatly shortened, batch preparation of the pellet is implemented, and production cost is obviously reduced; the prepared inert matrix dispersion fuel pellet is higher in compactness, smaller in crystal grain size, fewer in structural defects and more excellent in high-temperature stability and irradiation resistance.

Description

technical field [0001] The invention relates to the field of nuclear fuel, in particular to a method for preparing porous fuel core inert base dispersed fuel pellets. Background technique [0002] Inert Matrix Dispersion Pellet (IMDP) is a new type of reactor fuel with high intrinsic safety performance that draws on the structural design of high-temperature gas-cooled reactor nuclear fuel and encapsulates the fuel core in an inert ceramic material matrix. The fuel core of the inert-based dispersed fuel pellets is a tri-structural isotropic (TRI-structural Isotropic, TRISO) multi-layer coating particle, while the TRISO multi-layer coating fuel particle is composed of a fuel core and a four-layer coating structure . The fuel core material is uranium dioxide (UO2), which is the most widely used in commercial nuclear reactors. 2 ), with a diameter of about 500 μm, and the four-layer coating structure from the inside to the outside is a loose pyrolytic carbon layer with a thick...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/02G21C21/10G21C3/64
CPCG21C3/64G21C21/02G21C21/10Y02E30/30
Inventor 杨振亮李冰清高瑞贾建平唐浩刘徐徐钟毅段丽美黄奇奇王志毅
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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