An example postclosure risk assessment using the potential Yucca Mountain Site Page: 4 of 300
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The risk analysis described in this document was performed for the U.S.
Department of Energy's (DOE) Office of Civilian Radioactive Waste Management
(OCRWM) over a 2-year time period ending in June 1988. The objective of
Pacific Northwest Laboratory's (PNL) task was to demonstrate an integrated,
though preliminary, modeling approach for estimating the postclosure risk
associated with a geologic repository for the disposal of high-level nuclear
waste. The modeling study used published characterization data for the
proposed candidate site at Yucca Mountain, Nevada, along with existing models
and computer codes available at that time. Some of the site data and
conceptual models reported in the Site Characterization Plan published in
December 1988, however, were not yet available at the time that PNL conducted
the modeling studies.
The final report describing PNL's study was subsequently reviewed by
OCRWM and its contractors, with the comment period extending to August 1989.
At that time, DOE decided, based on the reviewers' concerns, not to proceed
with comment resolution and publication of the document. Even though PNL's
study was conducted as a demonstration of performance assessment methodology,
reviewers were concerned that the results would be perceived as an actual
risk assessment for the Yucca Mountain site at a time when most detailed site
characterization studies had not even been initiated.
In.April 1991, OCRWM requested PNL to continue publication of the
document, after addressing the review comments, but without performing
significant new calculations. This report provides not only a citable
reference for work completed in 1988, but documentation for some of the early
performance assessment studies that contribute to OCRWM's eventual approach
to the risk analyses needed for the license application. New models have
been developed, more site data have been collected, and new risk calculations
have been initiated since this work was completed. The results contained
here should be interpreted as only a demonstration of an initial stage of
study for determining the risk of the proposed repository, rather than a
definitive statement of risk based on comprehensive models and the most
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Doctor, P.G.; Eslinger, P.W.; Elwood, D.M.; Engel, D.W.; Freshley, M.D.; Liebetrau, A.M. et al. An example postclosure risk assessment using the potential Yucca Mountain Site, report, May 1, 1992; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc622172/m1/4/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.