High-level waste preclosure systems safety analysis: Phase 2, Final report

The original work scope for Phase II was not completed. The major objective was to demonstrate the methodology, developed in Phase I by quantifying a sample problem consisting of a small subset of accident scenarios identified in the first study phase. The purpose of the sample problem is to check the application of the importance ranking scheme on a tractable size of problem, and to illustrate the utility of prioritization for the evaluation of proposed design changes. All the features of the complete analytical technique will be applied including uncertainty and sensitivity analysis, common-cause failure evaluation, and human error contribution. Work included the human reliability analysis, mine-related information search to assemble data on mining equipment and human reliability, common-cause failure analysis, and quantification of accident scenarios selected for the sample problem demonstration. The analysis was based on the conceptual Basalt repository design. 33 refs., 16 figs., 15 tabs