A kind of max phase ceramic matrix dispersed pellet nuclear fuel and its preparation method and application

A ceramic matrix and nuclear fuel technology, which is applied in the fields of reactor fuel material, nuclear power generation, and reduction of greenhouse gases, can solve problems such as affecting the safety of the reactor and reducing the fault tolerance performance of pellets, and achieves broad application prospects, improving fault tolerance performance, combining tight effect

Active Publication Date: 2020-05-01
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 max phase ceramic matrix dispersed pellet nuclear fuel and its preparation method and application
  • A kind of max phase ceramic matrix dispersed pellet nuclear fuel and its preparation method and application

Examples

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Effect test

Embodiment 1

[0056] A method for preparing MAX phase ceramic matrix dispersed pellet nuclear fuel, comprising the following steps:

[0057] Step 1: Weigh each powder according to the following specifications and ratios: Ti 3 SiC 2 , 1-2μm, 98wt.%, polyethyleneimine, 2wt%. Mix the above powder with an equal amount of alcohol, put it into a nylon ball mill jar, use zirconia balls for the grinding balls, the ball-to-material ratio is 3:1, and mill for 24 hours to obtain Ti 3 SiC 2 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 Ti 3 SiC 2 Mix powder.

[0058] Step 2: Put Ti 3 SiC 2 The mixed slurry is coated on TRISO particles by spray deposition method. The TRISO pellets were rolled on a shaker and subjected to a temperature of 70°C. Adopt the Ti prepared in step 1 3 SiC 2 Slurry, form mist slurry by spray generator, Ti 3 SiC 2 The powder is deposited on the sur...

Embodiment 2

[0066] A method for preparing MAX phase ceramic matrix dispersed pellet nuclear fuel, comprising the following steps:

[0067] Step 1: Weigh each powder according to the following specifications and ratios: Ti 3 AlC 2 , 1-2μm, 99.5wt.%, polyethyleneimine, 0.5wt%. Mix the above powder with an equal amount of alcohol, put it into a nylon ball mill jar, use zirconia balls for the grinding balls, the ball-to-material ratio is 3:1, and mill for 24 hours to obtain Ti 3 AlC 2 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 Ti 3 AlC 2 Mix powder.

[0068] Step 2: Put Ti 3 AlC 2 The mixed slurry is coated on TRISO particles by spray deposition method. The TRISO pellets were rolled on a shaker and subjected to a temperature of 70°C. Adopt the Ti prepared in step 1 3 AlC 2 Slurry, form mist slurry by spray generator, Ti 3 AlC 2 The powder is deposited on the...

Embodiment 3

[0076] Step 1: Weigh each powder according to the following specifications and ratios: Ti 3 AlC 2 , 1-2μm, 99wt.%, polyethyleneimine, 1wt%. . Mix the above powder with an equal amount of alcohol, put it into a nylon ball mill jar, use zirconia balls for the grinding balls, the ball-to-material ratio is 3:1, and mill for 24 hours to obtain Ti 3 AlC 2 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 Ti 3 AlC 2 Mix powder.

[0077] Step 2: Put Ti 3 AlC 2The mixed slurry is coated on TRISO particles by spray deposition method. The TRISO pellets were rolled on a shaker and subjected to a temperature of 70°C. Adopt the Ti prepared in step 1 3 AlC 2 Slurry, form mist slurry by spray generator, Ti 3 SiC 2 The powder is deposited on the surface of the TRISO particles. By adjusting the angle of the spray generator, opening size, spray pressure, flow rate an...

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Abstract

The invention discloses MAX-phase-ceramic-matrix dispersion pellet nuclear fuel and a preparation method and application thereof and solves the problem that due to the fact that the heat conductivity of the inert matrix of dispersion nuclear fuel lowers fast under an irradiation condition, accident fault tolerance is lowered, and reactor safety is affected in the prior art. The MAX-phase-ceramic-matrix dispersion pellet nuclear fuel comprises a compact MAX-phase ceramic inert matrix, fuel elements and fuel-free-area protecting layer prepared by MAX-phase ceramic. The preparation method includes: wrapping TRISO particles with MAX-phase ceramic mixed slurry through a spray deposition method to form the compact MAX-phase ceramic inert matrix so as to prepare a fuel-area biscuit, performing compression molding on MAX-phase ceramic mixed powder to obtain a fuel-free-area biscuit, compositing and compressing the fuel-area biscuit and the fuel-free-area biscuit to obtain an IMDP (inert matrix dispersion pellet) biscuit, sintering the IMDP biscuit, and machining the sintered biscuit into a fuel component in a water reactor and a high-temperature gas cooled reactor.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel, and in particular relates to a MAX-phase ceramic matrix dispersion pellet nuclear fuel, 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. The same is true of the 311 Fukushima nuclear accident in Japan. Although its causes are complex, including factors such as reactor aging, design defects, and improper emergency response measures, the inherent safety of existing nuclear fuel elements in the face of major acciden...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/58G21C3/60G21C3/64
CPCG21C3/58G21C3/60G21C3/64Y02E30/30
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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