发明名称 |
Method of manufacturing large-grained uranium dioxide fuel pellets containing U3O8 |
摘要 |
Disclosed is a method of manufacturing large-grained uranium dioxide pellets through the use of U3O8 single crystals. The method consists of two main steps; producing U3O8 single crystals and manufacturing large-grained UO2 pellets. The U3O8 single crystals are produced by annealing U3O8 powder to make U3O8 polycrystalline aggregates having a large crystal size, and by dividing the U3O8 polycrystalline aggregate into its constituent U3O8 single crystals. Large-grained UO2 pellets are produced by forming a mixture comprising UO2 powder and the U3O8 single crystals, making granules of the mixture, pressing the granules into green pellets, and sintering the green pellets above 1600° C. for more than one hour in a reducing gas. The U3O8 powder is produced preferably by heating defective UO2 pellets in air to oxidize UO2 to U3O8. The invention provides a method of manufacturing a large-grained UO2 pellet with defective pellets reused.
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申请公布号 |
US6251309(B1) |
申请公布日期 |
2001.06.26 |
申请号 |
US19990357169 |
申请日期 |
1999.07.19 |
申请人 |
KOREA ATOMIC ENERGY RESEARCH INSTITUTE;KOREA ELECTRIC POWER CORPORATION |
发明人 |
SONG KUN-WOO;KIM KEON-SIK;KANG KI-WON;KIM JONG-HUN;JUNG YOUN-HO |
分类号 |
G21C3/62;G21C21/02;(IPC1-7):G21G4/00;G21C21/00 |
主分类号 |
G21C3/62 |
代理机构 |
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