Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Plural fuel segments or elements
Patent
1986-11-21
1988-04-19
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Plural fuel segments or elements
376434, 376443, G21C 332
Patent
active
047388200
ABSTRACT:
A nuclear reactor fuel assembly bottom nozzle to guide thimble attachment system and method allowing bottom nozzle removal and replacement without inverting the fuel assembly. At manufacture, a bottom-insertable, two-headed bolt secures the bottom nozzle adaptor plate to the guide thimble bottom end plug. The two-headed bolt is unthreadable in the guide thimble from the top of the upright fuel assembly. At reconstitution, a top-insertable bolt fastener secures the replacement or original bottom nozzle adaptor plate to the guide thimble bottom end plug. The bolt fastener is inserted in the guide thimble from the top of the upright fuel assembly. The bolt fastener is unthreadable in the guide thimble from the top of the upright fuel assembly for a second reconstitution. Less preferably, the bolt fastener also can be used for original manufacture (in place of the two-headed bolts previously discussed).
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Abandoned U.S. patent application Ser. No. 186,937 filed Sep. 12, 1980 to John M. Shallenberger and Stephen J. Ferlan for Reconstitutable Fuel Assembly for a Nuclear Reactor incorporated by reference into U.S. Pat. No. 4,522,780.
Gjertsen Robert K.
Wilson John F.
Walsh Donald P.
Westinghouse Electric Corp.
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