Fabrication of nuclear fuel pellets

Details Fabrication of nuclear fuel pellets Fabrication of nuclear fuel pellets

1985-02-25

1987-02-17

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 36, 419 37, 419 38, 419 42, 252643, 423253, 423260, 423261, B22F 100

Patent

active

046438734

ABSTRACT:
Uranium dioxide powder produced by a gas phase process in which uranium hexafluoride is reacted with dry steam and then with steam and/or hydrogen at a higher temperature is subjected to mechanical treatment, e.g. milling, to break down its structure and increase its packing density. Other powders may be included with the uranium dioxide. The treated powder is mixed with a limited quantity (e.g. 0.5% by weight) of binder, preferably a high strength adhesive, to produce a free flowing powder and formed into pellets by pressing. The pellets are then sintered. Optionally the free flowing powder is spheroidised by tumbling prior to pressing into pellets.

REFERENCES:
patent: 3371133 (1968-02-01), Nishijima
patent: 4397824 (1983-08-01), Butler et al.
patent: 4436677 (1984-03-01), Radford et al.
Journal of Nuclear Materials, vol. 106, No. 1/2, Apr. 1982, pp. 15-33.
Search report of FR 85 03467.

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