Abstract
This report presents a new model for iodine stress corrosion cracking (SCC) of Zircaloy, developed as an ingredient of EPRI's SPEAR light-water reactor fuel performance code. The model is based on experimental data generated under related EPRI programs and elsewhere, as well as certain theoretical considerations. It is a unified treatment of SCC crack initiation, crack propagation, and non-SCC fracture, treating such sub-process as intergranular failure, transgranular (cleavage plus fluting) failure, ductile rupture, changes in the local stress and strain distribution due to crack formation and growth, iodine penetration along the SCC crack, and the mutual couplings among these processes.
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