The U.S. Department of Energy (DOE) has indicated that it may use Alloy 22 as the waste package
outer container material for the potential high-level waste repository at Yucca Mountain, Nevada. Longterm
corrosion performance of Alloy 22 is key to containment of radionuclides within the potential
repository. Even though Alloy 22 exhibits high corrosion resistance in many environments, it could be
susceptible to localized corrosion when exposed to either saturated solutions formed by dust
deliquescence or seepage water brines at elevated temperatures. Localized corrosion in the form of
crevice corrosion could persist if certain environmental and electrochemical conditions prevail in the
repository drift environment. A one-dimensional physico-chemical analytical model has been
developed to evaluate the effect of brine quantity and electrochemical conditions on the localized
corrosion process. The model is then used to estimate the electrochemical conditions necessary for
sustained propagation of localized corrosion at a given crevice site.