Containment Barrier System Performance Assessment Modeling

by Daniel B. Bullen, Iowa State Univ, Ames, United States,

Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1993


A mathematical model to predict the cumulative failure distribution for the containment barrier system (CBS) employed in a deep geologic disposal facility is presented as a function of near-field environmental conditions. The effects of container design, areal power density, and dominant heat transfer mode on the cumulative container failure distribution are studied. This model has been employed to describe the performance of the CBS as one part of a risk-based performance assessment of the Yucca Mountain site. The model employs Weibull and exponential distributions to describe container failures. Parameter values employed in the model are based upon simple, time-dependent, mechanistic models and relevant corrosion data, which describe failure of individual components of the CBS as a function of environmental conditions. The relative importance of container design, areal power density, and dominant heat transfer mode on predicted container performance is demonstrated through comparison of the results for each container design exposed to each set of environmental conditions.

Subject Headings: Environmental issues | Failure analysis | Heat transfer | Sustainable development | Power transmission | Power outage | Mathematical models | Underground storage

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