Abstract
A model for in-reactor stress rupture is proposed based on stress-induced creep cavity formation on a fraction of an evolving distribution of helium bubbles. The observed creep rates, ductility and rupture times for some high temperature in-reactor data and the relatively high ductilities in breeder spectra at lower temperatures are predicted correctly. At low stresses, the rupture exposure scales as α 1//trHe/dpa δ 2 and the total ductility 1//trHe/dpa δ.
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