Nuclear fuel assembly grid with predetermined grain orientation
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United States of America Patent
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-
Jul 7, 1987
Issued Date -
N/A
app pub date -
Oct 15, 1985
filing date -
Jun 5, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Zirconium alloy or Zircaloy grid straps in a fuel assembly grid have predetermined texture (or grain orientation) to offset stress relaxation which occurs upon irradiation of the grid. Particularly, by providing 'f-factor' values of the material greater in generally orthogonal, longitudinal directions of the straps than in the strap height direction, the grid strap material will undergo irradiation shrinkage in the longitudinal directions which will serve to offset stress relaxation and maintain sufficient spring force on the fuel rods extending through the cells formed by the grid straps.
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