The stress corrosion cracking (SCC) behavior of tank steel was investigated in a series of environments designed to simulate the chemistry of legacy nuclear weapons production waste being stored at the Hanford tank reservation. Tests consisted of both slow strain rate tests using tensile specimens and dynamic (increasing) stress intensity tests using compact tension specimens. Based on the work conducted, SCC occurs in two potential ranges depending on the main chemistry of the waste simulant (i.e., nitrate-based or carbonate-based). Though the results indicate that SCC in the tanks may be unlikely, diligent mitigation and corrosion potential monitoring efforts are still necessary.