Fabrication method of sintered duplex nuclear fuel pellet

Details Fabrication method of sintered duplex nuclear fuel pellet Fabrication method of sintered duplex nuclear fuel pellet

2005-02-02

2009-02-03

Griffin, Steven P (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating radioactive material

C264S646000

Reexamination Certificate

active

07485246

ABSTRACT:
A method for fabricating a sintered duplex nuclear fuel pellet includes the steps of: preparing a first powder composed of a material selected from the group consisting of UO2and UO2—Er2O3, and a second powder composed of UO2—Gd2O3and a sintering additive; producing a duplex compact consisting of an annular outer portion composed of the first powder and a cylindrical inner portion composed of the second powder; and sintering the duplex compact under a reducing gas atmosphere, wherein the sintering additive contains manganese of 0.001% to 2% by weight based on the total weight of the cylindrical inner portion.

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Fisher, M. et al., “Development of a Double Pellet ThO2-UO2”,Journal of Nuclear Materials138 (1986) pp. 242-247, North-Holland, Amsterdam.

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