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Homogenized coated particle dispersion fuel and preparation method thereof

A technology of coating particles and dispersing fuel, which is applied to fuel elements, manufacturing reactors, nuclear power generation, etc., can solve problems such as inaccurate calculations, reduce the temperature gradient of coated particles and disperse fuel, and achieve radial distribution and reduce damage. Risk, Optimal Uniformity Effect

Active Publication Date: 2022-01-14
CHINA NUCLEAR POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the object of the present invention is to provide a homogeneous coated particle dispersion fuel and its preparation method, so as to realize the radial uniform distribution of TRISO coated fuel particles to optimize the TRISO coated fuel particles The uniformity in the fuel reduces the temperature gradient of the coated particle-dispersed fuel during operation in the stack, effectively protects the integrity of the coated particle-dispersed fuel, reduces the risk of radioactive product release, and solves the neutron physics of the air-cooled micro-reactor , Inaccurate calculation of thermal hydraulic theory

Method used

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  • Homogenized coated particle dispersion fuel and preparation method thereof
  • Homogenized coated particle dispersion fuel and preparation method thereof
  • Homogenized coated particle dispersion fuel and preparation method thereof

Examples

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Embodiment 1

[0033] A homogenized coated particulate fuel comprising a matrix material, coated TRISO coated fuel particles and a series of silicon carbide cylinders; wherein:

[0034] The matrix material is made by adding Al 2 o 3 As a sintering aid, it is added to nano-scale silicon carbide powder, using alcohol as a dispersant, mixed evenly by wet ball milling, then dried and sieved;

[0035] Clothed TRISO-coated fuel particles are obtained by coating a silicon carbide layer on the surface of TRISO-coated particles whose fuel core material is composed of uranium dioxide. The outer layer of TRISO-coated fuel particles is damaged due to the collision of TRISO-coated fuel particles;

[0036] A series of silicon carbide cylinders are prepared by chemical vapor deposition at a temperature higher than 1600°C in an atmosphere of methyltrichlorosilane; the radii of the prepared series of silicon carbide cylinders form an arithmetic progression, and the etc. The tolerance of the difference ser...

Embodiment 2

[0046] A homogenized coated particulate fuel comprising a matrix material, coated TRISO coated fuel particles and a series of silicon carbide cylinders; wherein:

[0047] The matrix material is obtained by adding Y 2 o 3 As a sintering aid, it is added to nano-scale silicon carbide powder, using alcohol as a dispersant, mixed evenly by wet ball milling, then dried and sieved;

[0048] Clothed TRISO-coated fuel particles are obtained by coating a silicon carbide layer on the surface of TRISO-coated fuel particles whose fuel core material is composed of uranium dioxide. The coated silicon carbide layer acts as a buffer layer to avoid manipulation during the manufacturing process Cause TRISO-coated fuel particles to collide, resulting in damage to the outer layer of TRISO-coated fuel particles;

[0049] A series of silicon carbide cylinders are prepared by sintering silicon carbide powder at a temperature higher than 1600°C; the radii of the prepared series of silicon carbide c...

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Abstract

The invention relates to a homogenized coated particle dispersion fuel and a preparation method thereof. By adopting the preparation method of the homogenized coated particle dispersion fuel provided by the invention, the prepared homogenized coated particle dispersion fuel realizes radial uniform distribution of TRISO coated fuel particles on the basis of conventional coated particle dispersion fuel, and the temperature gradient of the coated particle dispersion fuel during operation in a reactor is reduced. The integrity of the coated particle dispersion fuel is effectively protected, the release risk of radioactive products is reduced, and meanwhile the problem that neutron physics and thermal hydraulic theoretical calculation of an air-cooled micro-reactor is inaccurate is solved.

Description

technical field [0001] The invention belongs to the field of coated particle dispersed fuel production, and relates to a uniform coated particle dispersed fuel and a preparation method thereof. Background technique [0002] The gas-cooled micro-reactor is a micro-modular gas-cooled reactor based on the development and improvement of the prismatic high-temperature gas-cooled reactor. Operation and maintenance and modular layout deployment to improve user experience, with the design features of "inherent security, intelligence, and flexibility", can meet the power supply needs of seabeds, isolated islands, remote areas on land, and may even meet special areas such as outer space. [0003] Due to the inherent safety of the gas-cooled micro-reactor, no refueling during the whole life, direct circulation of helium, less manual intervention and other design requirements, it is necessary for the gas-cooled micro-reactor fuel to have the characteristics of strong stability, corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/20G21C21/14
CPCG21C3/20G21C21/14Y02E30/30
Inventor 朱思阳贺楷江小川董建华张朔婷张成龙
Owner CHINA NUCLEAR POWER ENG CO LTD
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