Full ceramic type covering fuel particle, preparation method of full ceramic type covering fuel particle and fuel element

A technology for coating fuel particles and fuel elements, which is applied to fuel elements, reactor fuel materials, and manufacturing reactors, etc., can solve problems such as corrosion and oxidation, and achieve the effect of simple process flow, convenient process operation, and industrialized mass production.

Active Publication Date: 2015-12-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of all-ceramic coated fuel particles and its preparation method, and the fuel element made by it, so as to

Method used

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  • Full ceramic type covering fuel particle, preparation method of full ceramic type covering fuel particle and fuel element
  • Full ceramic type covering fuel particle, preparation method of full ceramic type covering fuel particle and fuel element
  • Full ceramic type covering fuel particle, preparation method of full ceramic type covering fuel particle and fuel element

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Embodiment 1

[0036] This embodiment relates to a coated fuel particle, which uses ceramic fuel as the core, and sequentially coats a loose silicon carbide layer, a silicon carbide transition layer and a dense silicon carbide layer on the outside of the core.

[0037] The material composition of the ceramic fuel core is uranium dioxide, and the diameter is 500-600 μm.

[0038] The loose silicon carbide layer is made of methyltrichlorosilane with a density of 1.40g / cm 3 , with a thickness of 90-100 μm.

[0039] The silicon carbide transition layer is made of methyltrichlorosilane with a density of 2.60g / cm 3 , with a thickness of 10-15 μm.

[0040] The dense silicon carbide layer is made of methyltrichlorosilane with a density of 3.20g / cm 3 , with a thickness of 40-50 μm.

Embodiment 2

[0042] This embodiment relates to a coated fuel particle, with ceramic fuel as the core, and a loose silicon carbide layer, a silicon carbide transition layer and a dense silicon carbide layer that are sequentially coated on the outside of the core.

[0043] The material composition of the ceramic fuel core is a mixture of uranium dioxide and uranium carbide, and the ceramic core is a sphere with a diameter of 700-800 μm;

[0044] The loose silicon carbide layer is made of hexamethyldisilane with a density of 1.80g / cm 3 , with a thickness of 60-80 μm.

[0045] The silicon carbide transition layer is made of hexamethyldisilane with a density of 2.60 g / cm 3 , with a thickness of 10-15 μm.

[0046] The dense silicon carbide layer is made of hexamethyldisilane with a density of 3.18g / cm 3 , with a thickness of 30-40 μm.

Embodiment 3

[0048] This embodiment relates to a coated fuel particle, with ceramic fuel as the core, and a loose silicon carbide layer, a silicon carbide transition layer and a dense silicon carbide layer that are sequentially coated on the outside of the core.

[0049] The material composition of the ceramic fuel core is a mixture of uranium dioxide and uranium carbide, and the ceramic core is a sphere with a diameter of 500-600 μm;

[0050] The loose silicon carbide layer is made of methyltrichlorosilane with a density of 2.00g / cm 3 , with a thickness of 70-90 μm.

[0051] The silicon carbide transition layer is made of methyltrichlorosilane with a density of 2.70g / cm 3 , with a thickness of 15-25 μm.

[0052] The dense silicon carbide layer is made of methyltrichlorosilane with a density of 3.20g / cm 3 , with a thickness of 50-60 μm.

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Abstract

The invention relates to a full ceramic type covering fuel particle, a preparation method of the full ceramic type covering fuel particle and a fuel element prepared from the full ceramic type covering fuel particle. The full ceramic type covering fuel particle comprises a nuclear fuel core, a loose silicon carbide layer, a silicon carbide transition layer and a compact silicon carbide layer, wherein the loose silicon carbide layer, the silicon carbide transition layer and the compact silicon carbide layer sequentially cover the outside of the nuclear core. The full ceramic type fuel element is prepared by dispersing and distributing covering fuel particles in a silicon carbide substrate. When the fuel element provided by the invention is used, the problems of oxidation and corrosion of the existing covering fuel particles and the fuel element during air and water injection under the condition of reactor accidents can be solved. The fuel element can be used for the reactor types such as high-temperature air-cooled reactors, gas-cooled fast reactors, molten salt reactors, space reactors and pressurized water reactors.

Description

technical field [0001] The invention relates to the field of nuclear fuel elements, in particular to a novel silicon carbide-based all-ceramic coated fuel particle, a preparation method thereof, and a nuclear fuel element prepared therefrom. Background technique [0002] At present, the fourth-generation reactors represented by high-temperature gas-cooled reactors use coated fuel particles as the main component of fuel elements, and the coated fuel particles are dispersed in graphite matrix to form fuel elements. The coating layer covering the fuel particles is a loose pyrolytic carbon layer, an inner dense pyrolytic carbon layer, a silicon carbide layer, and an outer dense pyrolytic carbon layer from the inside to the outside. Due to the excellent high-temperature mechanical properties of silicon carbide, this coating structure can effectively bind the fission products inside the coating particles, ensuring the safety of the reactor under normal working conditions, especial...

Claims

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Application Information

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IPC IPC(8): G21C3/62G21C3/42G21C3/04G21C21/02
CPCY02E30/30
Inventor 刘荣正刘马林卢振明刘兵其他发明人请求不公开姓名
Owner TSINGHUA UNIV
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