[en] Models for the effect of the chemical environment on crack-growth processes in austenitic and ferritic stainless were evaluated. The effect of impurity segregation, yield strength, and hydrogen on crack growth of HT-9 and radiation-induced phosphorus segregation on the intergranular stress corrosion of 316SS have been evaluated. Moderate increases in impurity segregation and/or yield strength caused significant decreases in the K/sub IC/ and K/sub TH/ of HT-9, while less than a 10 fold increase in the intergranular stress-corrosion crack-growth rate of 316SS was predicted for a fluence of 100 dpa using the radiation-induced phosphorus segregation data of Brimhall et al. and the stress-corrosion model of Parkins. Therefore, while radiation-induced impurity segregation is greater in 316SS than HT-9, the effect of impurity segregation may be more pronounced in HT-9