Abstract

Experiments have been carried out to study the irradiation growth phenomenon in zirconium and its alloys. Polycrystalline zirconium, annealed and cold-worked Zircaloy-2, and annealed Zr-2.5%Nb have been irradiated at 353 and 553 K up to neutron doses of 5 × 10 25 n/m 2. Dimensional changes occurring in-reactor and during post-irradiation heat treatment were measured. The results are interpreted in terms of the present understanding of the physical processes involved in the irradiation growth phenomenon.

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