Preliminary results are presented from the long-term corrosion test program of candidate materials for the high-level radioactive waste packages that would be emplaced in the potential repository at Yucca Mountain,Nevada.The present waste package design is based on a multi-barrier concept having an inner container of a corrosion allowance material.Test specimens have been exposed to simulated bounding environments that may credibly develop in the vicinity of the waste packages.Corrosion rates have been calculated for weight loss and crevice specimens,and U-bend specimens have been examined for evidence of stress corrosion cracking (SCC).Galvanic testing has been started recently and initial results are forthcoming.pitting characterization of test specimens will be conducted in the coming year.This test program is expected to continue for a minimum of five years so that long-term corrosion data can be determined to support corrosion model development,performance assessment,and waste package design.
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