Preclosure Safety Analysis for a Prospective Yucca Mountain Conceptual Design Repository

by C. W. Ma, Bechtel Natl, Inc, United States,
L. J. Jardine, Bechtel Natl, Inc, United States,

Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1990


A preliminary probabilistic risk assessment was performed for the prospective Yucca Mountain conceptual design repository. A new methodology to quantify radioactive source terms was developed and applied in the analysis. The study identified 42 event trees comprising 278 accident scenarios. Thee maximum offsite dose evaluated in this study is about 1,000 mrem. For the majority of the accident scenarios, either the offsite dose is less than 100 mrem or the probability of occurrence is less than 1 × 10-9/yr. Only 11 accident scenarios with a dose larger than 100 mrem and an associated probability greater than 1 × 10-9/yr were identified. A more detailed follow-on analysis for seismic events of various severity was also performed, and similar results were obtained. Therefore, based on the results of this analysis, no significant risk to the general public was identified during the preclosure period for the conceptual repository design.

Subject Headings: Safety | Radioactive wastes | Conceptual design | Risk management | Probability | Trees | Occupational safety | Industrial wastes | Nevada | United States

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