Patent ID: 6909766

Claim:
A production method for a nuclear fuel assembly support grid comprising the steps of: assembling a plurality of inner straps and a plurality of outer straps in a grid form; welding intersections of the inner straps and intersections of the inner straps and outer straps; and carrying out annealing thereafter to precipitate an intermetallic compound on the intersections of the inner straps and intersections of the inner straps and outer straps welded; wherein said inner and outer straps comprises a zircaloy alloy comprising iron in an amount of 0.18 to 0.24% by weight, chromium in an amount of 0.07 to 0.13% by weight, and oxygen in an amount of 0.09 to 0.16% by weight, and said annealing is carried out sufficiently such that said intermetallic compound represented by Zr(Fe, Cr) 2 is recrystallized.