Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Plural fuel segments or elements
Patent
1988-12-08
1990-04-17
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Plural fuel segments or elements
376272, 376235, 376327, G21C 332, G21C 706
Patent
active
049178563
ABSTRACT:
A self-latching reactivity-reducing device contains neutron absorbing material and is installable in a guide thimble of a spent fuel assembly for reducing the reactivity of the assembly to allow its storage in an on-site fuel storage facility. The device includes an elongated rod which contains the neutron absorbing material and has a central passage extending between oppposite ends of the rod. A self-latching mechanism is disposed on a leading end of the rod and engageable with a lower end portion of the guide thimble upon full insertion of the rod in the guide thimble so as to render the self-latching mechanism unlatchable from the guide thimble without the use of an independent tool inserted solely through the rod passage from a trailing end thereof. A closure plug is removably fastened to the trailing end of the rod for closing the passage therethrough. The self-latching mechanism includes a plurality of latch members being mounted for pivotal movement between displaced latching and releasing positions at the leading end of the rod and biased toward the latching position.
REFERENCES:
patent: 3377252 (1968-04-01), Knights
patent: 3527670 (1970-09-01), Winders
patent: 4152206 (1979-05-01), Jabsen
patent: 4304631 (1981-12-01), Walton et al.
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patent: 4687631 (1987-08-01), Wilson et al.
patent: 4748908 (1988-06-01), Freezor et al.
patent: 4803042 (1989-02-01), Gilmore et al.
Boyd William A.
Mueller Donald E.
Behrend Harvey E.
Westinghouse Electric Corp.
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