Method for the manufacture of oxide sintered nuclear fuel bodies

Details Method for the manufacture of oxide sintered nuclear fuel bodies Method for the manufacture of oxide sintered nuclear fuel bodies

1987-09-18

1989-03-28

Locker, Howard J.

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating radioactive material

252636, 252643, 423251, 423260, 423261, G21C 2100, G21C 362, C09K 1104, G21G 400

Patent

active

048161934

ABSTRACT:
Method for manufacturing sintered oxidic nuclear fuel bodies by molding uranium oxide starting powder, a mixture of uranium oxide and plutonium oxide starting powder or of uranium-plutonium oxide mixed-crystal starting powder to form blanks and by a heat treatment of these blanks with a U.sub.4 O.sub.9 or (U, Pu).sub.4 O.sub.9 crystal phase developed in them to a degree which can be crystallographically detected at a sintering temperature in the range of 1000.degree. to 1400.degree. C. in an oxidizing and subsequently in a reducing gas atmosphere. The starting powder and/or the blanks are preroasted at a roasting temperature below the sintering temperature in a roasting gas atmosphere with oxidizing action and with an oxygen potential in which the U.sub.4 O.sub.9 (U, Pu).sub.4 O.sub.9 crystal phase is developed and cooled down subsequently to a starting temperature below the roasting temperature in an inert or oxidizing cooling-down gas atmosphere. Starting from this starting temperature, the blanks are heated to the sintering temperature in an inert or oxidizing heating gas atmosphere while maintaining the U.sub.4 O.sub.9 or the (U, Pu).sub.4 O.sub.9 crystal phase.

REFERENCES:
patent: 4052330 (1977-10-01), Jensen et al.
patent: 4348339 (1982-09-01), Assmann et al.
patent: 4438050 (1984-03-01), Dorr et al.
patent: 4578229 (1986-03-01), Assmann et al.
Bailor, et al., ed. 1973, Comprehensive Inorganic Chemistry, Pergamon Press, Australia, pp. 225-231.

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