Induced nuclear reactions: processes – systems – and elements – Handling of fission reactor component structure within... – Refueling machines
Patent
1979-09-17
1982-05-18
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Handling of fission reactor component structure within...
Refueling machines
294 86A, 337394, 414146, 376270, G21C 1920
Patent
active
043303692
ABSTRACT:
A reusable thermally actuated linkage arrangement includes a first link member having a longitudinal bore therein adapted to receive at least a portion of a second link member therein, the first and second members being sized to effect an interference fit preventing relative movement therebetween at a temperature below a predetermined temperature. The link members have different coefficients of thermal expansion so that when the linkage is selectively heated to a temperature above the predetermined temperature, relative longitudinal and/or rotational movement between the first and second link members is enabled. Two embodiments of a thermally activated linkage are disclosed which find particular application as actuators for a grapple head positioning arm in a nuclear reactor fuel handling mechanism to facilitate back-up safety retraction of the grapple head independently from the primary fuel handling mechanism drive system.
REFERENCES:
patent: 3243557 (1966-03-01), Fairbanks
patent: 3293136 (1966-12-01), Harris
patent: 3383286 (1968-05-01), Paget
patent: 3632978 (1972-01-01), Wrob
General Atomic Company
Walsh Donald P.
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