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Preparation method of UO2 composite UN-UO2 fuel pellet

A technology of UN-UO2 and fuel pellets, which is applied in the field of preparation of UO2 composite UN-UO2 fuel pellets, can solve the problems of prolonging the process cycle, increasing the difficulty of process operation, reducing the reactivity of UN and water, and achieving broad application prospects Effect

Inactive Publication Date: 2021-06-22
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, because the prepared UN is extremely easy to oxidize, all processes need to be carried out in a glove box, which increases the difficulty of process operation, prolongs the process cycle, and can only reduce the reactivity of UN and water to a certain extent. , In addition, UN-UO is used for light water reactors 2 Pellet shape and size are not reported in detail

Method used

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Examples

Experimental program
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Embodiment

[0020] After cleaning the oxide layer of 1kg metal uranium sheet with nitric acid, soak it in alcohol to remove the residual impurities on the surface, dry it, put it in a hydrogenation dehydrogenation furnace, pass in 0.03~0.07MPa hydrogen gas, and hydrogenate it at 265~280℃ for 1~3 hours , heat up to 530-570°C for 3-5 hours for dehydrogenation, vacuumize and cool down to room temperature, repeat the above-mentioned hydrogenation-dehydrogenation process 3 times, and obtain metal uranium powder with a certain particle size;

[0021] Continue to feed 0.03-0.07MPa nitrogen gas into the hydrodehydrogenation furnace, raise the temperature of metal uranium powder to 450-500°C for nitriding for 6-10 hours, keep the positive pressure in the furnace and cool down to room temperature to obtain uranium-nitrogen compound;

[0022] Put the uranium-nitrogen compound into the Φ40mm steel mold in the glove box, wrap it with plastic film after the first pre-compression, take out the glove box ...

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PUM

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Abstract

The invention belongs to the technical field of preparation of uranium nitride composite fuel pellets, and particularly relates to a preparation method of a UO2 composite UN-UO2 fuel pellet. The preparation method comprises the steps of preparing metal uranium powder through cyclic hydrogenation dehydrogenation, and carrying out nitridation to obtain a uranium nitrogen compound; pre-pressing the uranium nitrogen compound in a graphite mold, carrying out high-temperature denitrification on the mold and the uranium nitrogen compound in a tungsten-molybdenum sintering furnace to obtain a blocky UN material, and crushing and ball-milling the blocky UN material to prepare UN powder which can stably exist at room temperature; taking the UN powder and 5-80 wt% of UO2 powder, and carrying out dry three-dimensional mixing or wet ball milling mixing with ethyl alcohol as a medium to obtain UN-UO2 mixed powder; after the cylindrical UN-UO2 green body is sleeved with the annular UO2 green body, assembling cover-shaped UO2 green bodies on the upper portion and the lower portion of the combined green body,obtaining a UO2-wrapped UN-UO2 green body, placing the UO2-wrapped UN-UO2 green body in a graphite mold to be subjected to hot pressing sintering, and obtaining the UN-UO2 composite fuel pellet of a UO2 wrapping area. The method has a wide application prospect in the light water reactor.

Description

technical field [0001] The invention belongs to the technical field of preparation of uranium nitride composite fuel pellets, in particular to a UO 2 Composite UN-UO 2 Method for preparing fuel pellets. Background technique [0002] with UO 2 Compared with fuel pellets, UN pellets have higher uranium density and thermal conductivity, which can significantly improve the economic benefits of nuclear fuel. Since UN has poor water corrosion resistance, it will react with water when working in a reactor. In order to reduce its reaction Activity, a certain amount of UO can be added to UN 2 , currently the international community for UN-UO 2 The preparation method of the composite material is mainly to prepare UN powder by hydrogenation dehydrogenation and nitriding denitrification, adding a certain amount of UO 2 After powder mixing, hot pressing and sintering to prepare UN-UO 2 composite material. However, in this process, because the prepared UN is extremely easy to oxidi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C21/02G21C21/10
CPCG21C21/02G21C21/10Y02E30/30
Inventor 李宗书隋政何勇梁方知刘文涛乔伟杜江平董秋实
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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