Preparation method of porous-fuel-core inert matrix dispersion fuel pellet

A technology for dispersing fuel and core materials, which is applied in reactor fuel materials, nuclear engineering, nuclear power generation, etc., can solve the problems of insufficient uranium abundance in inert-based disperse fuel pellets, and improve neutron economy and uranium abundance , The effect of reducing production costs

Active Publication Date: 2017-09-01
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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Benefits of technology

This patented technical effect described in the current patents relates to improving the quality control of nuclear weapons manufacturing processes while reducing their environmental impact. By incorporating certain elements into the explosive mixture composition, these techniques help prevent damage caused by excessively heat generated when making new fuels. Additionally, they allow for efficient use of resources without compromising product reliability. These improvements lead to improved economic benefits over traditional methods like fusion breeding.

Problems solved by technology

This patented describes different types of materials called ammonia matrices or tantalum nitride powder (ATZ). These materials have several advantages over other conventional fuels such as liquid metal coolant systems (LMCS's). They can be easily loaded into solid oxides without losing their original shape when they break down under specific conditions like exposure to extreme temperatures during use. Additionally, these materials provide improved thermal conductivity compared to previous designs due to its ability to trap radionuclide elements within itself. Overall, this technology improves the reliability and durability of LMFP fuel rods.

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

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Claims

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Application Information

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Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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