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A kind of ZRC inert base dispersed pellet nuclear fuel and its preparation method and application

A kind of nuclear fuel and inert technology, which is applied in the direction of reactor fuel material, nuclear engineering, nuclear power generation, etc., can solve the problems of affecting the safety of reactors and the decline of fault-tolerant performance of pellet accidents, so as to achieve wide application prospects, improve fault-tolerant performance of accidents, and closely integrate Effect

Active Publication Date: 2020-05-05
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is still a problem with SiC. Its thermal conductivity decreases rapidly under irradiation conditions, which will lead to a decrease in the fault tolerance performance of the pellet under the working conditions in the reactor, thereby affecting the safety of the reactor.

Method used

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  • A kind of ZRC inert base dispersed pellet nuclear fuel and its preparation method and application
  • A kind of ZRC inert base dispersed pellet nuclear fuel and its preparation method and application

Examples

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Effect test

Embodiment 1

[0057] A method for preparing ZrC inert base dispersed pellet nuclear fuel, comprising the following steps:

[0058] Step 1: Weigh each powder according to the following specifications and proportions: ZrC, 200nm, 95wt.%; 5wt% Si. Mix the above powder with an equal amount of alcohol, put it into a nylon ball mill jar, use zirconia balls as the grinding balls, and have a ball-to-material ratio of 3:1, and mill for 24 hours to obtain ZrC slurry. The slurry was divided into equal parts, one part was used to coat TRISO particles (different fuel cores); the other part was dried at 80°C for 24 hours, and ZrC mixed powder was obtained after sieving.

[0059] Step 2: Coating ZrC mixed slurry on TRISO particles by spray deposition method. The TRISO pellets were rolled on a shaker and subjected to a temperature of 70°C. The ZrC slurry prepared in step 1 was used to form a mist slurry by a spray generator, and the ZrC powder was deposited on the surface of the TRISO particles. By adju...

Embodiment 2

[0067] A method for preparing ZrC inert base dispersed pellet nuclear fuel, comprising the following steps:

[0068] Step 1: Weigh each powder according to the following specifications and proportions: ZrC, 200nm, 95wt.%; 5wt% Si. Mix the above powder with an equal amount of alcohol, put it into a nylon ball mill jar, use zirconia balls as the grinding balls, and have a ball-to-material ratio of 3:1, and mill for 24 hours to obtain ZrC slurry. The slurry was divided into equal parts, one part was used to coat TRISO particles (different fuel cores); the other part was dried at 80°C for 24 hours, and ZrC mixed powder was obtained after sieving.

[0069] Step 2: Coating ZrC mixed slurry on TRISO particles by spray deposition method. The TRISO pellets were rolled on a shaker and subjected to a temperature of 70°C. The ZrC slurry prepared in step 1 was used to form a mist slurry by a spray generator, and the ZrC powder was deposited on the surface of the TRISO particles. By adju...

Embodiment 3

[0077] A method for preparing ZrC inert base dispersed pellet nuclear fuel, comprising the following steps:

[0078] Step 1: Weigh each powder according to the following specifications and proportions: 95wt.% ZrC, 200nm; 5wt% VC. Add polyethyleneimine accounting for 1% of the total mass of sintering aid and zirconium carbide powder as a dispersant, mix the above powder with an equal amount of alcohol, and put it into a nylon ball mill jar. The grinding balls are zirconia balls, and the ball-to-material ratio is 3: 1. Ball mill for 24 hours to obtain ZrC slurry. The slurry was divided into equal parts, one part was used to coat TRISO particles (different fuel cores); the other part was dried at 80°C for 24 hours, and ZrC mixed powder was obtained after sieving.

[0079] Step 2: Coating ZrC mixed slurry on TRISO particles by spray deposition method. The TRISO pellets were rolled on a shaker and subjected to a temperature of 70°C. The ZrC slurry prepared in step 1 was used to ...

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Abstract

The invention discloses ZrC inert matrix dispersed pellet nuclear fuel as well as a preparation method and application thereof and aims at solving the problems in the prior art that since thermal conductivity of an inert matrix of dispersed nuclear fuel is reduced rapidly under the irradiation condition, fault-tolerant performance is reduced and reactor safety is influenced. The ZrC inert matrix dispersed pellet nuclear fuel comprises the inert matrix, a fuel element and a fuel-free zone protective layer, wherein the inert matrix is ZrC, and the fuel-free zone protective layer is made from ZrC. The preparation method comprises the following steps: coating ZrC mixed slurry on TRISO particles by virtue of a spray deposition process to form a compact ZrC inert matrix, carrying out mould pressing on ZrC mixed powder to form a fuel-free zone biscuit, then carrying out complex pressing on the inert matrix and the fuel-free zone biscuit to form an IMDP biscuit, then sintering the IMDP biscuit in a vacuum furnace at high temperature, cooling the furnace, and then carrying out machining on a sintered billet according to the required size, so that a fuel assembly in a water reactor and a high temperature gas cooled reactor is obtained.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel, and in particular relates to a ZrC inert base dispersed pellet nuclear fuel and its preparation method and application. Background technique [0002] Nuclear power is safe, reliable, low-carbon and clean, and will be an important part of the future global energy structure. At present, countries around the world are actively promoting the construction of nuclear power, so as to alleviate the energy crisis and improve the climate and environment. Throughout the history of nuclear energy development in the world, every nuclear accident will directly lead to a revolution in nuclear energy application technology. In the 311 Fukushima nuclear accident in Japan, the release of radioactive substances caused by the melting of fuel in the nuclear power plant and the hydrogen explosion caused by the reaction of zirconium and water in the nuclear power plant were the direct causes of the severe nuclear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/64G21C21/02G21C21/10C04B35/56C04B35/622
CPCC04B35/5622C04B35/622G21C3/64G21C21/02G21C21/10Y02E30/30
Inventor 高瑞杨振亮李冰清张鹏程贾建平唐浩刘徐徐钟毅段丽美黄奇奇王志毅
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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