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Rapid preparation process of inert dispersion fuel pellet

A technology for dispersing fuel and preparation technology, which is applied in nuclear engineering, manufacturing reactors, climate sustainability, etc. It can solve the problems of poor dispersing effect of TRISO particles, difficulty in meeting application technical requirements, and difficulty in realizing industrialization, so as to improve the tolerance Performance, shortening of preparation cycle, and the effect of not easy to fall off

Active Publication Date: 2017-07-21
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 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 requires high equipment requirements, long production cycle, low efficiency, and high cost. Dispersion in SiC matrix is ​​also poor
Not only is it difficult to meet the actual application technical requirements, it is even more difficult to achieve industrialization

Method used

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  • Rapid preparation process of inert dispersion fuel pellet
  • Rapid preparation process of inert dispersion fuel pellet
  • Rapid preparation process of inert dispersion fuel pellet

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Experimental program
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Embodiment

[0031] The purpose of this embodiment is to overcome the deficiencies in the existing inert-based dispersed fuel pellet preparation methods, and to provide a method for preparing silicon carbide-enhanced uranium dioxide inert-based dispersed fuel pellets, which can be produced in a short process cycle. An inert-based dispersed fuel pellet with high TRISO particle content, good particle integrity, uniform dispersion, and high density silicon carbide matrix is ​​obtained.

[0032] Such as figure 1 Shown, a kind of rapid preparation process of inert base dispersed fuel pellets, comprises the following steps:

[0033] (1) Preparation of mixed slurry: First, in parts by weight, wet-mix 0-15 parts of sintering aid and 85-100 parts of silicon carbide powder with a wet-mixing solvent, and then add 0.5-3 parts of dispersant, and stirred for 4~24h to obtain a uniformly dispersed silicon carbide mixed slurry;

[0034] (2) Preparation of core-shell particles: put TRISO particles into a ...

example 1

[0040] (1) Preparation of mixed slurry: by weight, 5 parts of alumina powder, 3 parts of yttrium oxide powder, 2 parts of silicon dioxide powder, 90 parts of silicon carbide powder and absolute ethanol Wet mixing was carried out as a wet mixing solvent. After mixing evenly, 2 parts of polyethyleneimine was added as a dispersant. After mixing for 12 h, a silicon carbide mixed slurry was obtained.

[0041] (2) Preparation of core-shell particles: A TRISO particle containing uranium dioxide, three-structure isotropy, and a diameter of 0.8-1.0mm is loaded into a heatable drum, and the heating temperature of the drum is controlled at 80°C. The TRISO particles are rolled in the drum, and after the temperature of the TRISO particles rises above 75°C, a part of the silicon carbide mixed slurry is continuously sprayed on the surface of the TRISO particles by spray deposition, and a silicon carbide coating layer is formed on the surface of the TRISO particles, thereby obtaining TRISO / Si...

example 2

[0046] (1) Preparation of mixed slurry: wet-mix 100% silicon carbide powder with a particle size of 20nm~50μm in the weight percentage with absolute ethanol as a wet mixing solvent. After mixing evenly, add 0.5% of the total mass of silicon carbide powder % polyethyleneimine was used as a dispersant, and the silicon carbide mixed slurry was obtained after mixing for 24 hours.

[0047] (2) Preparation of core-shell particles: put a TRISO particle containing uranium dioxide, three-structure isotropy, and a diameter of 0.8-1.0mm into a heatable drum, and the heating temperature is 60°C, so that the TRISO particles are in the drum Rolling, silicon carbide is sprayed onto the surface of TRISO particles by spray deposition to obtain SiC / TRISO core-shell structure particles, and the weight of TRISO particles increases by 170%.

[0048] (3) Press the core: put the SiC / TRISO core-shell structure particles into the powder metallurgy mold and press it under the pressure of 80MPa to form ...

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Abstract

The invention discloses a rapid preparation process of an inert dispersion fuel pellet. The rapid preparation process comprises the five steps of preparation of mixed material slurry, preparation of core-shell structure particles, core pressing, core-shell pressing and preparation forming. The preparation process overcomes the shortcomings of an existing inert dispersion fuel pellet preparation method, and the inert dispersion fuel pellet high in TRISO particle content, good in particle integrity, uniform in dispersion and high in silicon carbide matrix compactness can be obtained within a shorter process period. In the prepared inert dispersion fuel pellet, the silicon carbide matrix compactness is up to 92% or above, and the volume fraction content of TRISO particles in whole fuel is 30%-45%.

Description

technical field [0001] The invention relates to a preparation method of nuclear fuel, in particular to a rapid preparation process of inert-based dispersed fuel pellets. Background technique [0002] With the rapid development of the industrial level, my country's energy consumption has also shown rapid growth. At present, my country's electricity consumption of the whole society ranks first in the world, and its total power scale ranks first in the world. However, 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. Since coal combustion produces a large amount of carbon dioxide, greenhouse gases and dust, the power industry has become the largest source of carbon dioxide emissions in my country. In recent years, frequent large-scale smog has occurred in my country, seriously endangering the ecological environment and the health of the people. In the fu...

Claims

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Application Information

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IPC IPC(8): G21C21/02
CPCG21C21/02Y02E30/30
Inventor 杨振亮李冰清高瑞唐浩贾建平刘彤黄华伟孙茂州马赵丹丹
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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