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A preparation method of fuel particles and core-shell fuel particles obtained therefrom

A technology of fuel particles and coated particles, which is applied in the direction of reactor fuel materials, nuclear engineering, nuclear power generation, etc., can solve the problem that the layer of combustible neutron poison cannot be easily coated, so as to reduce the risk of amoeba effect and prolong the reactor life. Run time, avoidance of reaction effects

Active Publication Date: 2020-06-05
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the combustible neutron poison layer cannot be easily coated in the above-mentioned prior art, the present invention aims to provide a method for preparing fuel particles and the resulting core-shell fuel particles

Method used

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  • A preparation method of fuel particles and core-shell fuel particles obtained therefrom
  • A preparation method of fuel particles and core-shell fuel particles obtained therefrom
  • A preparation method of fuel particles and core-shell fuel particles obtained therefrom

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1 ZrO 2 / PSiC-ThO 2 Preparation of core-shell fuel particles

[0026] Such as figure 1 Shown, the preparation method according to the fuel particle of the present invention comprises the steps:

[0027] 1. Core preparation: choose ZrO with a diameter of 500 μm 2 Microspheres serve as cores.

[0028]2. Preparation of porous silicon carbide layer: argon gas is introduced into the high-temperature fluidized bed chemical vapor deposition device, and the above-mentioned prepared ZrO 2 Microspheres, the temperature rises to 1500 °C, and a mixture of argon, hydrogen, propylene and trichloromethylsilane (MTS) is introduced, wherein the molar ratio of trichloromethylsilane to propylene is 1:0.6, and hydrogen is used as a carrier. With gas, the deposition rate is 0.6 μm / min, and a composite layer containing silicon carbide and carbon is obtained. The above sample was placed in a high-temperature furnace, heated to 850° C. under an air atmosphere, and kept for 5 hour...

Embodiment 2

[0031] Example 2 PuO 2 / PZrC-ThO 2 Preparation of core-shell fuel particles

[0032] The specific process steps are as follows:

[0033] 1. Core preparation: choose PuO with a diameter of 500 μm 2 Microspheres serve as cores.

[0034] 2. Preparation of porous zirconium carbide layer: the above PuO 2 The microspheres are loaded into a high-temperature fluidized bed chemical vapor deposition device, the temperature rises to 1100°C, and a mixed gas of hydrogen, zirconium chloride and methane is introduced, wherein the molar ratio of zirconium chloride and methane is 1:1.6, and hydrogen is used as Carrier gas, deposition rate 0.3 μm / min, to obtain a composite layer containing zirconium carbide and carbon. The above sample was placed in a high-temperature furnace, heated to 850° C. under an air atmosphere, and kept for 3 hours to remove carbon to obtain a 10 μm thick porous zirconium carbide layer (PZrC).

[0035] 3. Vacuum impregnation: Add ammonia water dropwise at a flow r...

Embodiment 3

[0037] Example 3 CeO 2 / pSiC-Lu 2 o 3 Preparation of core-shell fuel particles

[0038] The specific process steps are as follows:

[0039] 1. Core preparation: choose CeO with a diameter of 100 μm 2 Microspheres serve as cores.

[0040] 2. Preparation of porous silicon carbide layer: argon gas is introduced into the high-temperature fluidized bed chemical vapor deposition device, and the above prepared CeO 2 Microspheres, the temperature rises to 1400 ° C, and a mixture of argon, hydrogen, propylene and trichloromethylsilane (MTS) is introduced, wherein the molar ratio of trichloromethylsilane to propylene is 1:0.6, and hydrogen is used as a carrier. With gas, the deposition rate is 0.4 μm / min, and a composite layer containing silicon carbide and carbon is obtained. The above sample was placed in a high-temperature furnace, heated to 850° C. under an air atmosphere, and kept for 3 hours to remove carbon and obtain a 10 μm thick porous silicon carbide layer (PSiC).

[0...

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Abstract

The invention relates to a method for preparing fuel particles. The method comprises the steps: supplying a spherical core, performing formation of a porous silicon carbide layer or a zirconium carbide layer on the core through chemical vapor deposition so as to obtain porous silicon carbide layer / zirconium carbide layer-coated particles, soaking the porous silicon carbide layer / zirconium carbidelayer-coated particles in an active liquid for vacuum impregnation so as to obtain compound-filled porous silicon carbide layer / zirconium carbide layer-coated particles, and decomposing compounds which are filled in the compound-filled porous silicon carbide layer / zirconium carbide layer-coated particles so as to form combustible neutron-poison oxides or thorium oxide and finally obtain the fuel particles. The invention also provides core-shell fuel particles prepared by using the method. The fuel particle safety which is stack safety is improved through coating of the silicon carbide layer orthe zirconium carbide layer outside the core, and meanwhile the stack economy can be improved through the combustible neutron-poison oxides or thorium oxide filled in the silicon carbide layer or zirconium carbide layer.

Description

technical field [0001] The invention relates to the field of nuclear fuel preparation, in particular to a method for preparing fuel particles and core-shell fuel particles obtained therefrom. Background technique [0002] As the smallest structural unit in fuel elements, fuel particles have been widely used in reactors. The preparation process of fuel particles is simple, and the risk of exposure to radioactive dust is greatly reduced during preparation, collection and transportation, and they are often evenly dispersed in non-fissile materials (matrix phase) to form a dispersed fuel core. In addition, the fuel particles have good sphericity and good jet flow pattern in the fluidized bed, often used as the core, covered with metal coating or non-metal coating, to prevent the fission products from escaping into the matrix phase, damage the matrix phase, and prolong the service life of components. For example, Nb, Ni, W, Mo, Be, and Nb-V metal coatings are coated on the surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/02G21C3/60
CPCG21C3/60G21C21/02Y02E30/30
Inventor 王鹏张锋林俊张海青曹长青严超黄鹤李子威于小河
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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