Nuclear reactor spacer grid loading
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United States of America Patent
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May 17, 1988
Grant Date -
N/A
app pub date -
Jun 11, 1986
filing date -
Jun 11, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Spacer grids for a nuclear fuel assembly are arranged in superadjacent groups having grid springs and opposing dimples which contact a fuel rod passing through a cell of the spacer grid with a selected spring force. As fabricated, the lowermost grid exerts the greatest initial spring force on the rod; intermediate grids exert a smaller spring force; and the uppermost grid exerts yet a lower spring force. The fuel rod is supported laterally while it is permitted to age expand axially with little axial compression resulting from the spring forces of the springs and dimples, whereby bowing of the rod is diminished.
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