Nuclear fuel rod having pellet stack holding means
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United States of America Patent
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Oct 13, 1987
Grant Date -
N/A
app pub date -
Apr 17, 1986
filing date -
Apr 19, 1985
priority date (Note) -
Expired
status (Latency Note)
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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.
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