Bottom nozzle to guide tube connection

Details Bottom nozzle to guide tube connection Bottom nozzle to guide tube connection

1990-05-29

1991-02-26

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

376353, 376451, G21C 332

Patent

active

049960210

ABSTRACT:
A pressurized water reactor fuel assembly (10) has a fastener or bolt (40) of stainless steel with a longitudinal groove (48) attaching zircaloy guide tubes (16) to stainless steel lower end fitting (14). The guide tubes have internally threaded zircaloy plugs (52) for mating with the threads (46) of bolt (40) with points (50) created in the threads (46) by groove (48) providing increased friction. The groove (48) acts to accommodate stresses set up by differential thermal expansion of zircaloy and stainless steel. Apertured stainless steel cups (60) receive the plugged ends of guide tubes (16) to capture them and provide connections to lower grid (22) of stainless steel.

REFERENCES:
patent: 4070239 (1978-01-01), Bevilacqua
patent: 4381284 (1983-04-01), Gjertsen
patent: 4668469 (1987-05-01), Widener
patent: 4717529 (1988-01-01), Merkovsky
patent: 4738820 (1988-04-01), Wilson

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