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In-reactor creep and swelling of Type 348 stainless steel from ATR SN-5 and ETR H-10 in-pile tube measurements were investigated to identify and characterize their mechanistic relationships at temperatures less than 723 K. The principal creep mechanism appears to be irradiation-enhanced-diffusion-accommodated flow along high conductivity paths near the grain boundaries. The irradiation creep is a function of temperature and is presented as an empirical equation. The swelling in the ATR in-pile tubes is also presented as an empirical equation.
irradiation creep, swelling, classical creep mechanism, diffusion-accommodated flow, creep models, electron microscopy, grain boundary diffusion, volume diffusion, cavities, faulted dislocation loops, SIPA
Scientific Specialist, EG&G Idaho Inc., Idaho Falls, Idaho
Principal Engineer, Westinghouse Hanford Co., Richland, WA