Induced nuclear reactions: processes – systems – and elements – Control component for a fission reactor – Nonconventional control material
Patent
1981-12-28
1984-10-02
Cangialosi, Sal
Induced nuclear reactions: processes, systems, and elements
Control component for a fission reactor
Nonconventional control material
376419, 376447, G21C 1100
Patent
active
044747284
ABSTRACT:
An improved annular burnable poison pellet of aluminum oxide-boron carbide (Al.sub.2 O.sub.3 --B.sub.4 C) adapted for positioning in the annular space of concentrically disposed zircaloy tubes. Each tubular pellet is fabricated from Al.sub.2 O.sub.3 powders of moderate sintering activity which serves as a matrix for B.sub.4 C medium size particle distrbution. Special pellet moisture controls are incorporated in the pellet for moisture stability and the pellet is sintered in the temperature range of 1630.degree.-1650.degree. C. This method of fabrication produces a pellet about 2 inch long with a wall thickness of about 0.020 inch to 0.040 inch. Fabricating each pellet to about 70% theoretical density gives an optimum compromise between fabricability, microstructure, strength and moisture absorption.
REFERENCES:
patent: 3108886 (1963-10-01), Adamsky et al.
patent: 3423324 (1969-01-01), Best et al.
patent: 3769160 (1973-10-01), Shepherd et al.
Cangialosi Sal
Erickson D. E.
Westinghouse Electric Corp.
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