Nuclear reactor spacer grid
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United States of America Patent
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-
Oct 27, 1987
Grant Date -
N/A
app pub date -
Apr 2, 1985
filing date -
Apr 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spacer grid for a nuclear fuel assembly having grid springs and opposing dimples which contact a fuel rod passing through a cell of the spacer grid along arcuate surfaces to cradle the fuel rod and cushion any vibration impact between the fuel rods and the grid springs and dimples during reactor operation and during fuel assembly shipping. The increased bearing surface between the fuel rods and grids also serves to reduce fuel rod scratching during fuel rod insertion. The grid springs and dimples may also be provided with ramped edges to further reduce fuel rod scratching. Stiffening ribs may be on the grid springs and/or dimples. The cradling action of the grid springs and dimples reduces deviations in fuel rod position from a centered position in a spacer grid cell.
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