Hideout return data from steam generators shows that environments in secondary side crevices tend to have values of pH in the mid-range and specifically neither in the alkaline or acidic ranges where SCC has been extensively studied. Alloys 600 and 690 have exhibited SCC in this range of pH in laboratory tests. Specific environments in which such SCC has been observed that is relevant to the mid-range of pH have contained species that include lead, copper, chloride, reduced sulfur and combinations of boric acid and sodium hydroxide. These environments can be investigated for their influence on possible SCC using an SCC parameter. The SCC parameter is derived from comparing fast and slow polarization scans. The result from this comparison produces a parameter called the SCC parameter, PSCC, which can be determined as a function of potential. Using conventional polarization measurements, SCC has been predicted in environments containing sulfur of valence from -2 to +6 and chloride in the mid-range of pH for alloys 600, 690 and 800 at 95°C. The effects of sulfur and chloride species on the breakdown potentials and the passive current densities are described. The preliminary SCC tests have been conducted at the potentials where SCC was predicted.