Review of U.S. Department of Energy Technical Basis Report for Surface Characteristics, Preclosure Hydrology, and Erosion (1995) / Chapter Skim
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EXECUTIVE SUMMARY
EXECUTIVE SUMMARY
Pages 1-8
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The committee based its evaluation of the TBR entirely on scientific judgment. The committee made no attempt to evaluate the science in terms of management decisions related to the suitability of Yucca Mountain as a high-level waste repository.
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Chapter 4 addresses the overall effectiveness of the TBR as a synthesis of currently available site characterization data, analyses, and technical interpretations. The main scientific and technical issues addressed by the TBR are summarized below (in italics)
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The analysis of hillslope ages presented in the TBR is inadequate because it is based on the use of a single geochronological method (cation ratio dating) , which is not well understood or calibrated, that is applied to only one type of deposit (heavily varnished hillslope boulder deposits)
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The values of parameters used in the flood routing calculations (Manning's n and the bulking factor) , and the assumption of critical flow velocity as the maximum flow velocity at all locations in the channels, provide conservative estimates of flow depths (i.e., overestimates of flow depths)
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The TBR discussion emphasizes historic pumping rates and water level declines predicted by using a numerical mode} that is based on one conceptual mode} of the flow system. It provides few data to support technical interpretations and does not consider alternative conceptual models of the ground water system.
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The concluding chapter of this report provides substantiation for this conclusion and in the spirit of peer review as a method to improve scientific quality offers eight recommendations for ways to increase the effectiveness of this and future TBRs. These recommendations are summarized below: I
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7. The TBR should be illustrated with informative graphics to orient the reader to the region and to illustrate spatial relationships among the various elements of the site Of particular importance are geologic and topographic maps and cross sections that illustrate the locations of land surfaces, drainages, rock units, surficial deposits, perched and ground water, the proposed repository, and selected data collection sites.
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From page 8... ...
This should occur in addition to external peer review, which serves as an independent check on scientific and technical quality. The peer review process should also include provisions to ensure that the results of internal and external peer review effectively feed back into this and future TBRs and, when appropriate, into the associated scientific and technical programs.
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