Element immersed in coolant of nuclear reactor

Details Element immersed in coolant of nuclear reactor Element immersed in coolant of nuclear reactor

1986-05-16

1988-02-16

Terapane, John F.

Induced nuclear reactions: processes, systems, and elements

Control component for a fission reactor

376426, G21C 726, G21C 330

Patent

active

047254017

ABSTRACT:
A coolant-displacement rod for a nuclear reactor including a stack of zirconium-oxide pellets in cladding of ZIRCALOY-4 alloy. The outer surfaces of certain of the pellets spaced at intervals along the stack are depressed. The cladding grows permanently when exposed to neutron flux but the zirconium oxide is dimensionally stable. Under the hoop stress impressed by the coolant on the cladding, the part of the cladding encircling each of the pellets with the depressed outer surface engages the outer surface compartmentalizing the pellets into sub-stacks. The formation of a long unsupported gap under the cladding which might collapse under the pressure and at the temperature coolant is prevented by forming a plurality of short unsupported gaps instead of one long gap.

REFERENCES:
patent: 3085954 (1963-04-01), Stohr et al.
patent: 3192621 (1965-07-01), Bauer et al.
patent: 4432934 (1984-02-01), Gjertsen et al.

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