Stress corrosion cracking (SCC) initiation of specimens extracted from filler metal (FM) 82 weldments was investigated in high purity 288˚C water. Accelerated autoclave slow strain rate tensile (SSRT) tests were conducted at different electrochemical corrosion potentials (ECPs) by varying the water chemistry through adjusting the concentration of dissolved hydrogen and oxygen in the recirculating water. The effect of surface preparation was also investigated. Statistical characterization of SCC initiation results showed that the ground surfaces (using P600 grit) of FM 82 appeared to be more resistant to SCC initiation than the surfaces polished via oxide polishing suspension (OPS). The effect of ECP on the SCC initiation susceptibility is also discussed through statistical characterization of the observed IG cracks.