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A preparation process of high triso content inert base dispersed fuel pellets

A technology for dispersing fuel and preparation process, which is applied in nuclear engineering, manufacturing reactors, climate sustainability, etc. It can solve the problems of poor particle dispersion effect of TRISO, difficult to achieve industrialization, and high equipment requirements, so as to improve the holding performance and safety. performance and economy, the effect of reducing the volume fraction

Active Publication Date: 2019-05-21
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the inert-based dispersed fuel pellets all use silicon carbide as the ceramic matrix. After mixing the two, they are prepared by a high-temperature hot-pressing reaction sintering process, which not only requires high equipment requirements, but also has a long production cycle, low efficiency, and high cost. The dispersion effect in the silicon matrix is ​​poor, and it is difficult to realize industrialization
More importantly, in order to avoid the exposure of radioactive substances caused by the shattering of TRISO particles under high temperature and pressure, the volume fraction of TRISO particles added to the silicon carbide matrix generally does not exceed 40%. In order to avoid cylindrical grinding of fuel In the process of surface layer TRISO particles are broken and radioactive substances are exposed, a layer of silicon carbide fuel-free area protection layer with a certain thickness needs to be added outside the fuel core, so the volume fraction of TRISO particles in the inert base dispersed fuel pellets is the highest. More than 40%, due to the structural characteristics of TRSIO itself, only about one-eighth of the volume of the whole particle is uranium dioxide fuel. Requirements for the use of water piles

Method used

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  • A preparation process of high triso content inert base dispersed fuel pellets
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  • A preparation process of high triso content inert base dispersed fuel pellets

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Embodiment 2

[0031] (1) Preparation of mixed slurry: by weight percentage, 5% alumina powder, 3% yttrium oxide powder, 2% silica powder and 90% silicon carbide powder were wetted with propanol as a wet mixing solvent. Mixing, and then adding polyethyleneimine accounting for 3% of the total mass of sintering aid and silicon carbide powder as a dispersant, stirring for 4 hours to make it fully mixed, to obtain a uniformly dispersed silicon carbide mixed slurry;

[0032](2) Preparation of core-shell particles: put standard nuclear fuel spherical particles containing uranium dioxide (three-structure isotropic particles) and TRISO particles with a diameter of 0.8-1.0mm into a heatable drum, open the drum, and The heating temperature is controlled at 60°C, and the TRISO particles are rolled in the drum. After the temperature of the TRISO particles rises to 60°C, part of the mixed slurry obtained in step (1) is atomized by spray deposition and sprayed continuously on the TRISO particles On the su...

Embodiment 3

[0037] (1) Preparation of mixed slurry: by weight percentage, 7.5% of alumina powder, 4.5% of yttrium oxide powder, 3% of silicon dioxide powder and 85% of silicon carbide powder were mixed with absolute ethanol as a wet mixing solvent. Wet mixing, and then adding polyethyleneimine accounting for 0.5% of the total mass of sintering aid and silicon carbide powder as a dispersant, stirring for 16 hours to make it fully mixed, to obtain a uniformly dispersed silicon carbide mixed slurry;

[0038] (2) Preparation of core-shell particles: put standard nuclear fuel spherical particles containing uranium dioxide (three-structure isotropic particles) and TRISO particles with a diameter of 0.8-1.0mm into a heatable drum, open the drum, and Control the heating temperature at 90°C, and roll the TRISO particles in the drum. After the temperature of the TRISO particles rises to 90°C, use an air pressure spray device to atomize part of the mixed slurry obtained in step (1) and spray it on th...

Embodiment 4

[0043] (1) Preparation of mixed slurry: by weight percentage, 4% of alumina powder, 2.4% of yttrium oxide powder, 1.6% of silicon dioxide powder and 92% of silicon carbide powder were mixed with absolute ethanol as a wet mixing solvent. Wet mixing, and then adding polyethyleneimine accounting for 2% of the total mass of sintering aid and silicon carbide powder as a dispersant, stirring for 12 hours to make it fully mixed, to obtain a uniformly dispersed silicon carbide mixed slurry;

[0044] (2) Preparation of core-shell particles: put standard nuclear fuel spherical particles containing uranium dioxide (three-structure isotropic particles) and TRISO particles with a diameter of 0.8-1.0mm into a heatable drum, open the drum, and The heating temperature is controlled at 80°C, and the TRISO particles are rolled in the drum. After the temperature of the TRISO particles rises to 80°C, the part of the mixed slurry obtained in step (1) is atomized with an air pressure spray device an...

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Abstract

The invention discloses a preparation technology of an inert-base dispersion fuel pellet with high TRISO content. The preparation technology comprises five steps of mixed slurry preparation, core-shell structure granule preparation, core pressing, shell pressing and preparation. The preparation method overcomes the problem that the TRISO content of existing inert-base dispersion fuel pellets is low, and the inert-base dispersion fuel pellet with high TRISO granule content, good granule completeness, uniform dispersion and high silicon carbide matrix density can be obtained in short technical period. In the prepared inert-base dispersion fuel pellet, the silicon carbide matrix density reaches 92% or above, and the volume fraction content of the TRISO granules in the whole fuel can reach 30%-65%.

Description

technical field [0001] The invention relates to a preparation method of ceramic-type nuclear fuel, in particular to a preparation process of high TRISO content inert base dispersed fuel pellets. Background technique [0002] With the rapid development of the industrial level, my country's energy consumption has also shown rapid growth. The heavy dependence on thermal power generation has caused my country to face major challenges in reducing greenhouse gas emissions and ensuring sustainable energy supply. As a clean energy utilization method with mature technology and continuously improved safety, nuclear power has the advantages of high capacity factor, high energy density, good economy, and high emission reduction benefit per unit investment compared with wind power and solar energy. The development of nuclear power has important strategic significance for adjusting my country's energy structure and promoting sustainable economic and social development. However, the inhe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/10G21C21/02
CPCG21C21/02G21C21/10Y02E30/30
Inventor 杨振亮刘彤李冰清黄华伟高瑞孙茂州贾建平马赵丹丹
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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