Fatigue crack growth rate tests conducted in primary grade reactor coolant at 550°F (288°C) on A533 Grade B Class 1 steel (HSST Plate 02) showed an increase in growth rates at a frequency of 1 cpm over previous results obtained at frequencies of 60 cpm and higher. This increase, the general character of the crack growth rate versus the ΔK curve, and the results from fractographic studies, all indicated that stress corrosion cracking might have occurred for this material and environment. However, a specimen loaded statically in a PWR environment showed no static load crack growth.

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