Oxide composite nuclear fuel pellet and preparation method thereof

A nuclear fuel and oxide technology, applied in the direction of reactor fuel elements, reactor fuel materials, nuclear engineering, etc., can solve the problems of poor thermal conductivity and low production efficiency, and achieve the goal of reducing sintering temperature, increasing density, and refining grains Effect
CN112358308AInactive Publication Date: 2021-02-12MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
Publication Date
2021-02-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a preparation method of an oxide composite nuclear fuel pellet, and belongs to the technical field of nuclear material preparation. The preparation method comprises the following steps: 1) preparing mixed powder: putting oxide nuclear fuel powder and filler powder into a ball-milling tank, adding zirconium dioxide grinding balls, mixing and carrying out ball milling; 2) compression molding: carrying out compression molding on the ball-milled mixed powder, and demolding to obtain an oxide composite nuclear fuel blank; 3) flash burning: electrifying the oxide composite nuclear fuel blank body, applying constant electric fields to two ends of the blank body, simultaneously raising the temperature, and carrying out flash burning when the flash burning temperature is met,wherein the current is a constant current of 0-700mA / mm < 2 >, the field intensity is 0-300V / cm, the flash burning temperature is 25-1000 DEG C, and the flash burning time is 0-600s; and after flashburning is completed, cooling and demolding and obtaining the oxide composite nuclear fuel pellet. According to the method, the constant direct-current electric field is applied to the two ends of theblank by utilizing a flash burning technology, so that the sintering temperature of uranium dioxide or thorium dioxide can be remarkably reduced, the sintering time is shortened and the density of the material is improved.
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Description

technical field

[0001] The invention belongs to the technical field of nuclear material preparation, in particular to an oxide composite nuclear fuel pellet and a preparation method thereof. Background technique

[0002] Uranium dioxide (UO 2 ) is currently the most widely used nuclear fuel in commercial nuclear reactors. It has excellent thermal, chemical, and radiation stability, and has good compatibility with cladding materials. It is an ideal nuclear fuel. However, relying on the characteristics of phonon heat transfer leads to its low thermal conductivity under high temperature and irradiation conditions, which has become an important factor limiting the performance of nuclear reactors, and the low thermal conductivity of uranium dioxide fuel pellets is also a factor causing nuclear accidents one. Therefore, increasing UO 2 The thermal conductivity of fuel pellets is an effective means to improve the safety of nuclear power plants. Currently by applying the UO 2 C...

Claims

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