How would you… …describe the overall signifi cance of this paper? This paper describes the general corrosion of Alloy 22 under the Yucca Mountain environment. Long-term modeling and data analysis for Alloy 22 are presented to estimate the performance of the Alloy 22 waste package outer barrier in the repository. …describe this work to a materials science and engineering professional with no experience in your technical specialty? Relatively few studies focus on longterm general corrosion behavior of highly corrosion-resistant Ni-Cr-Mo alloys such as Alloy 22. This work presents Alloy 22 general corrosion data analysis and modeling for longterm performance prediction. …describe this work to a layperson? General corrosion is an important mode of degradation of alloys. This paper summarizes the Alloy 22 general corrosion testing and modeling that has been undertaken in support of the Yucca Mountain Project. Longterm modeling and data analysis for Alloy 22 are presented. This paper presents the general corrosion model used by the Yucca Mountain Project to account for general corrosion degradation of the Alloy 22 waste package outer barrier. The general corrosion rates were determined from mass-loss measurements of specimens exposed to repository-relevant solutions at 60°C and 90°C for about fi ve years. An Alloy 22 general corrosion temperature dependence was obtained from short-term polarization resistance measurements and found to be consistent with values quoted in the literature. Uncertainty in mass-loss data and model fi tting was evaluated and incorporated into the resultant Alloy 22 general corrosion model.