Method of fabricating sintered nuclear fuel compact
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United States of America Patent
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Apr 12, 2005
Grant Date -
Apr 3, 2003
app pub date -
Aug 15, 2002
filing date -
Oct 2, 2001
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Abstract
To furnish stably a sintered nuclear fuel compact of uranium dioxide with a large grain diameter, a fabrication method therefor requires sintering a starting material at two stages in an oxidizing atmosphere and in a reducing atmosphere at relatively low temperatures. The starting material is either a powder mixture of uranium dioxide fresh material powder and triuranium octaoxide in a weight ratio of 75/25 .about. 55/45 or pulverulent mixed uranium oxides yielding a final O/U ratio equal to that of the powder mixture. The sintering process in the oxidizing atmosphere involves at least one time period of a temperature rise to a higher temperature of 1200 to 1100.degree. C. and at least one time period of a temperature drop to a lower temperature of up to 1080.degree. C. A temperature difference between the higher and lower temperatures is preferred to be 50.degree. C. or more.
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