Patent
1977-02-16
1978-01-24
Behrend, Harvey E.
176 40, G21C 1100
Patent
active
040702413
ABSTRACT:
A removable radial shielding assembly for use in the periphery of the core of a liquid-metal-cooled fast-breeder reactor, for closing interassembly gaps in the reactor core assembly load plane prior to reactor criticality and power operation to prevent positive reactivity insertion. The assembly has a lower nozzle portion for inserting into the core support and a flexible heat-sensitive bimetallic central spine surrounded by blocks of shielding material. At refueling temperature and below the spine is relaxed and in a vertical position so that the tolerances permitted by the interassembly gaps allow removal and replacement of the various reactor core assemblies. During an increase in reactor temperature from refueling to hot standby, the bimetallic spine expands, bowing the assembly toward the core center line, exerting a radially inward gap-closing-force on the above core load plane of the reactor core assembly, closing load plane interassembly gaps throughout the core prior to startup and preventing positive reactivity insertion.
REFERENCES:
patent: 3549491 (1970-12-01), Johnson
patent: 3753856 (1973-08-01), Ash
patent: 3964969 (1976-06-01), Brynsvold et al.
Kalinowski Joseph E.
Pennell William E.
Rylatt John A.
Swenson Daniel V.
Waldby Robert N.
Behrend Harvey E.
Carlson Dean E.
Jackson Frank H.
The United States of America as represented by the United States
Weinberger James W.
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