The Yucca Mountain Project is focused on producing a four-part viability assessment in late FY98.Its four components (design,performance assessment,cost estimate,and licensing development plan) must be consistent.As a tool to clarify design issues and compare design and performance assessment options,a series of repository sketches were developed for the sequential time phases of a repository.The boundaries of the time phases correspond to evolution in the engineered barrier system (EBS).
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