Method of manufacturing sintered nuclear fuel bodies

Details Method of manufacturing sintered nuclear fuel bodies Method of manufacturing sintered nuclear fuel bodies

1986-09-15

1988-06-07

Lechert, Jr., Stephen J.

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating radioactive material

252638, 252643, 264 56, 264 65, 264125, 376339, 376419, 376421, 423261, G21C 2100, C09K 1104, G21G 400

Patent

active

047495294

ABSTRACT:
Sintered nuclear fuel bodies are manufactured by pressing a powder of UO.sub.2 containing 1-20 percent by weight Gd.sub.2 O.sub.3 and up to 20 percent by weight U.sub.3 O.sub.8 into a pressed body and sintering the pressed body, the Gd.sub.2 O.sub.3 at least partly consisting of monoclinic Gd.sub.2 O.sub.3. The monoclinic Gd.sub.2 O.sub.3 used can be manufactured by heat treatment of cubic Gd.sub.2 O.sub.3 at a temperature of at least 1250.degree. C. By employing monoclinic Gd.sub.2 O.sub.3 a considerably increased homogeneity with respect to solid solution of gadolinium in the UO.sub.2 structure is obtained. Particularly favorable results are obtained if the sintering is carried out in a sintering atmosphere which, at 1750.degree. C., has an oxygen partial pressure which is higher than 10.sup.-7 atm.

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