Preparation method of UO2 composite UN-UO2 fuel pellet

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 deh...

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Bibliographic Details
Main Authors QIAO WEI, LI ZONGSHU, DONG QIUSHI, SUI ZHENG, LIANG FANGZHI, HE YONG, LIU WENTAO, DU JIANGPING
Format Patent
LanguageChinese
English
Published 22.06.2021
Subjects
NUCLEAR ENGINEERING
NUCLEAR PHYSICS
NUCLEAR REACTORS
PHYSICS
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Summary: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 UO
Bibliography:Application Number: CN201911325484