| 摘要 |
PURPOSE:To provide high burn-up adaptivity by arranging random the crystal axis of a channel box, using high Fe-Ni type zirconium-based alloy with high anti-corrosiveness to this and covering tube/spacer constituent material, and subjecting it to quenching in alpha+beta or beta phase. CONSTITUTION:A covering tube is so constructed that its solid solution amount of Sn, Fe, Ni at the outer surface is higher than that at the inner surface, and a channel box 4 is constructed so that its orientation factor (Fr value) of (0001) crystal axis in the direction across the plate thickness ranges 0.25-0.50. The covering tube, spacer 7, and box 4 are formed from 1-2wt.% Sn, 0.20-0.35wt.% Fe, 0.03-0.16wt.% Ni, and the remainder which consists substantially of zirconium. Heating of the box 4 into the beta-phase region is made for a certain desired time continuously while the plate is moved. This causes the (0001) axis to be random and provides high anti-corrosiveness to high temp, high pressure pure water. Thereby the high burn-up adaptivity is made practicable.
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