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Methods and Techniques Used to Convey Total System Performance Assessment Analyses and Results for Site Recommendation at Yucca Mountain, Nevada, USA

Description: Total System Performance Assessment (TSPA) is used as a key decision-making tool for the potential geologic repository for high level radioactive waste at Yucca Mountain, Nevada, USA. Because of the complexity and uncertainty involved in a post-closure performance assessment, an important goal is to produce a transparent document describing the assumptions, the intermediate steps, the results, and the conclusions of the analyses. An important objective for a TSPA analysis is to illustrate confidence in performance projections of the potential repository given a complex system of interconnected process models, data, and abstractions. The methods and techniques used for the recent TSPA analyses demonstrate an effective process to portray complex models and results with transparency and credibility.
Date: April 13, 2001
Creator: Mattie, P. D.; McNeish, J. A.; Sevougian, D. S. & Andrews, R. W.
Partner: UNT Libraries Government Documents Department

Testing of abstractions for total system performance assessment

Description: Total system performance assessment requires the explicit quantification of all the relevant processes and process interactions. However, process level descriptions of all the processes required for the evaluation of the total system performance is computationally impractical, thus requiring the abstraction of these process level models. In this paper the unsaturated flow abstraction methodology developed for the current iteration of the total system performance assessment for the potential repository at Yucca Mountain is presented along with a simple test problem.
Date: June 1, 1996
Creator: Vallikat, V.; Mishra, S.; Xiang, Y. & Sevougian, D.
Partner: UNT Libraries Government Documents Department


Description: This report is intended to serve as a status report, which essentially transmits the data that have been collected to date on the Large Block Test (LBT). The analyses of data will be performed during FY98, and then a complete report will be prepared. This status report includes introductory material that is not needed merely to transmit data but is available at this time and therefore included. As such, this status report will serve as the template for the future report, and the information is thus preserved. The United States Department of Energy (DOE) is investigatinq the suitability of Yucca Mountain (YM) as a potential site for the nation's first high-level nuclear waste repository. As shown in Fig. 1-1, the site is located about 120 km northwest of Las Vegas, Nevada, in an area of uninhabited desert.
Date: August 26, 1997
Creator: Wilder, D. G.; Blair, S. C.; Buscheck, T.; Carloson, R. C.; Lee, K.; Meike, A. et al.
Partner: UNT Libraries Government Documents Department


Description: For the Yucca Mountain Viability Assessment (VA), a reference design was tentatively selected in September 1997, and a series of model abstractions are being prepared for the performance assessment (PA) of that design. To determine the sensitivity of peak dose rate at the accessible environment to engineered components, several design options were subjected to the PA models available late in FY97.
Date: March 1, 1998
Creator: Blink, J. A.; Bailey, T. W.; Doering,; Lee, J. K.; Mccoy, J. K.; McKenzie, D. G. et al.
Partner: UNT Libraries Government Documents Department