The stress corrosion crack growth rate was evaluated on controlled chemistries of Alloy 182 and Alloy 82
weld metals in 288° C BWR water. Variables included the effects of the composition/stabilization, stress
intensity factor, dK/da, corrosion potential and water purity. In general, Alloy 82 weld metal only showed a ~2X
lower growth rate than Alloy 182 weld metal. All materials showed a dependence on stress intensity factor of
~K2.2, consistent with other materials. Very strong effects of +dK/da (~100 – 1000X) were observed, but essentially no effect of –dK/da, compared to constant K data. Strong effects (~10X) of corrosion potential were observed, and relatively limited effects (~2X) of 0 – 30 ppb sulfate were observed.
Keywords: Stress corrosion cracking, nickel alloy weld metals, high temperature water, water chemistry, Alloy
182 weld metal, Alloy 82 weld metal, stress intensity factor