Nuclear fuel rod having pellet stack holding means

Details Nuclear fuel rod having pellet stack holding means Nuclear fuel rod having pellet stack holding means

1986-04-17

1987-10-13

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Encased with nonfuel component

376413, 376420, G21C 300

Patent

active

046997571

ABSTRACT:
A nuclear fuel rod has a sheath closed by end plugs and a stack of fuel pellets in the sheath. The stack is retained in abutment against one of the end plugs during handling of the fuel rod by a radially expandable element having a cross-sectional area in rest condition such as it frictionally engages an internal surface of said sheath. When the fuel rod is brought to the reactor operating temperature, the radially expandable element is contracted clear of frictional contact by temperature responsive means of a shape memory alloy operatively associated with said radially expandable element and having a transformation temperature above atmospheric temperature.

REFERENCES:
patent: 3671393 (1972-06-01), Williams
patent: 4080253 (1978-03-01), Gesinski
patent: 4098644 (1978-07-01), Hirama
patent: 4111748 (1978-09-01), Hayashi

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