Nuclear fuel assembly grid with predetermined grain orientation

Details Nuclear fuel assembly grid with predetermined grain orientation Nuclear fuel assembly grid with predetermined grain orientation

1985-10-15

1987-07-07

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Grids

376438, 376441, 376442, 376445, 29 18, 29400N, G21C 334

Patent

active

046786325

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.

REFERENCES:
patent: 3262182 (1966-07-01), Duret
patent: 4474730 (1984-10-01), Hellman

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