Fuel pellet with continuous phase structure and preparation method of fuel pellet

A technology of fuel pellets and phase structure, which is used in the manufacture of reactors, climate sustainability, reactors, etc., can solve the problems of long sintering cycle, difficult collection, environmental pollution, etc., to improve thermal conductivity and comprehensive performance, and shorten sintering. time, the effect of increasing the sintering rate

Inactive Publication Date: 2018-11-16
GUANGDONG NUCLEAR POWER JOINT VENTURE +3
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Problems solved by technology

[0006] 1. The high melting point of nuclear fuel is high, and the sintering temperature of liquid phase sintering is usually higher than the melting point of low-melting components or eutectics, so the sintering temperature of liquid phase sintering is usually above 2400K. Excessively high sintering temperature makes the pellets unstabl

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  • Fuel pellet with continuous phase structure and preparation method of fuel pellet
  • Fuel pellet with continuous phase structure and preparation method of fuel pellet
  • Fuel pellet with continuous phase structure and preparation method of fuel pellet

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[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] combine figure 1 , 2 , the method for preparing fuel pellets with a continuous phase structure according to an embodiment of the present invention may include the following steps:

[0031] S1, put UO 2 The (uranium dioxide) particles 10 are spheroidized.

[0032] UO after spheroidization 2 The particles 10 are spherical or nearly spherical. UO 2 The spheroidization treatment of the particles 10 ensures the encapsulation effect of the subsequent additive powder 20 on it, facilitates the uniform distribution of the additive powder 20 at the grain boundary after sintering, and can also inhibit the microcracks generated during the sintering process.

[0033] When this step S1 is carried out, the pre-processed U...

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Abstract

The invention discloses a fuel pellet with a continuous phase structure and a preparation method of the fuel pellet. The preparation method comprises the following steps: S1, spheroidizing UO2 particles; S2, adding additive powder into the spheroidized UO2 particles, and mixing the additive powder and the spheroidized UO2 particles in a rolling manner to uniformly cover the surfaces of the UO2 particles with the additive powder; and S3, performing discharge plasma sintering on the mixed UO2 particles and additive powder to allow the additive powder to form continuous meshed thermal conductancechannels distributed between the UO2 particles, thereby preparing the fuel pellet with the continuous phase structure. In the preparation method disclosed by the invention, the surfaces of the spheroidized UO2 particles are coated with the additive powder at first, and then the discharge plasma sintering is performed, so that the continuous meshed phase structure can be formed in the fuel pelletto reduce the preparation difficulty, and then the thermal conductivity and the comprehensive performance of the fuel pellet are improved, the sintering time is shortened, and the sintering efficiencyis improved.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel, in particular to a fuel pellet with a continuous phase structure and a preparation method thereof. Background technique [0002] After the Fukushima nuclear accident in Japan, countries around the world began to pay close attention to the safety of nuclear fuel elements. Accident tolerant fuel (ATF for short) is a new generation fuel concept proposed to improve the fault tolerance performance of reactors under severe accident conditions. The application of accident-tolerant fuel will fundamentally improve the resistance of newly-built nuclear power plants to severe accidents, and effectively improve the safety and economy of nuclear power. [0003] Uranium dioxide nuclear fuel is a traditional commercial nuclear reactor fuel with excellent high temperature stability and radiation stability. However, the thermal conductivity of uranium dioxide is low, and the thermal conductivity will decre...

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Application Information

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IPC IPC(8): G21C21/16
CPCG21C21/16Y02E30/30
Inventor 马赵丹丹高思宇李锐孙茂州刘彤
Owner GUANGDONG NUCLEAR POWER JOINT VENTURE
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