Wednesday, March 19, 2008 - 1:35 PM
Convention Center, Second Level, 210 (Ernest N. Morial Convention Center)
08583

Cathodic Capacity of Alloy 22 in the Potential Yucca Mountain Repository Enviornment

Pavan K. Shukla and Xihua He, Southwest Research Institute; Roberto T. Pabalan, CNWRA - SwRI; Tae M. Ahn, U. S. Nuclear Regulatory Commission; Boffardi Bennett, Boffardi & Associates, Inc.; Andy Jung, SWRI

The U.S. Department of Energy (DOE) is evaluating the corrosion resistance properties of Alloy 22 for its potential use as the waste package outer container material for the potential high-level waste repository at Yucca Mountain. Alloy 22 could be susceptible to localized corrosion when exposed to dust deliquescence and seepage water brines at elevated temperatures. The localized corrosion will persist when necessary chemical, environmental, and electrochemical conditions exist in the repository drift environment. A one-dimensional physico-chemical model has been developed to evaluate the effect of brine quantity and electrochemical conditions on localized corrosion. The model is then used to estimate electrochemical conditions necessary for sustained propagation of localized corrosion at a given crevice site. The model is implemented for both dust deliquescence and seepage water brines.