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    • 73. 发明授权
    • Uranium dioxide article and method of producing the same
    • 二氧化铀文章及其生产方法
    • US3609095A
    • 1971-09-28
    • US3609095D
    • 1969-02-24
    • CA ATOMIC ENERGY LTD
    • WYATT BRIAN S
    • C01G43/025C01G56/00G21C3/62C09K3/00
    • G21C3/623C01G43/025C01G56/004C01P2006/10C01P2006/80Y02E30/38
    • The invention relates to the production of uranium dioxide articles such as nuclear fuel elements and ceramic shapes and which comprise a powdered mixture of UO2 X and U or Pu metal, wherein X is the amount of excess O2 required to produce, from said mixture, stoichiometric UO2 when subjected to reaction conditions under irradiation. One of the problems incidental to the use of nuclear fuel elements containing vibration packed mixtures of uranium dioxide (UO2) powders is the shrinkage of the UO2 that occurs at the high temperatures generated in the fuel element during irradiation. The maximum packed densities thus far obtained in nuclear fuel elements, made by vibration packing inside a metal sheath a mixture of different size fractions of UO2 powders, are in the range of 88-92 percent of the theoretical density. The UO2 powder is commonly prepared by crushing previously sintered or fused blocks of UO2. During irradiation of such an element, the UO2 powder tends to sinter with resultant shrinkage of the UO2 body . This shrinkage could impair heat transfer between fuel and sheath and might eventually result in the collapse of the fuel-sheathing when this is insufficiently thick to be self-supporting in the reactor coolant pressure.