Abstract
The present work compares the fatigue crack growth data for A508 Cl.III material in a high and low bulk sulphate PWR water environment at 325°C, the PWR coolant outlet temperature. Through careful fractography and a knowledge of the non-metallic sulphide distribution, it emerges that environmentally assisted crack (EAC) growth exhibiting plateau growth behaviour mainly occurs, irrespective of sulphate level over the range 70 ppb (10 −9) to 1000 ppb and chloride level over the range 40 to 300 ppb, when a growing fatigue crack encounters large non-metallic sulphide inclusion clusters.
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