Total-System Analyzer for Performance Assessment of Yucca Mountainby M. L. Wilson, Sandia Natl Lab, Albuquerque, United States,
F. C. Lauffer, Sandia Natl Lab, Albuquerque, United States,
N. B. Zieman, Sandia Natl Lab, Albuquerque, United States,
J. C. Cummings, Sandia Natl Lab, Albuquerque, United States,
Abstract: The Total-System Analyzer is a modular computer program for probabilistic total-system performance calculations. The code employs stratified random sampling from model parameter distribution functions to generate multiple 'realizations' of the system. The results of flow and transport calculations for each realization are combined into a probability distribution function of the system response as indicated by the performance measure. We give a detailed description of the code and present results for four example problems simulating the release of radionuclides from a proposed high-level-waste respository at Yucca Mountain, Nevada. The example simulations illustrate the impact of significant variation of percolation flux and sorption on radionuclide releases. We discuss the effects of numerical sampling error and of correlations among the model parameters.
Subject Headings: Radioactive wastes | Probability | Radioactive materials | Distribution functions | Parameters (statistics) | Standards and codes | Flow measurement | Sorption | Nevada | North America | United States
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