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AbstractAbstract
[en] United States practice has been to design high-level nuclear waste (HLW) geological repositories with waste densities sufficiently high that repository temperatures surrounding the waste will exceed 100 degrees C and could reach 250 degrees C. Basalt and devitrified vitroclastic tuff are among the host rocks considered for waste emplacement. Near-field repository thermal behavior and chemical alteration in such rocks is expected to be similar to that observed in many geothermal systems. Therefore, the predictive modeling required for performance assessment studies of the near field could be validated and calibrated using geothermal systems as natural analogues. Examples are given which demonstrate the need for refinement of the thermodynamic databases used in geochemical modeling of near-field natural analogues and the extent to which present models can predict conditions in geothermal fields
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Kovach, L.A. (ed.) (Nuclear Regulatory Commission, Washington, DC (United States). Div. of Regulatory Applications); Murphy, W.M. (ed.) (Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses); Nuclear Regulatory Commission, Washington, DC (United States). Div. of Regulatory Applications; Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses; 120 p; Sep 1995; p. 75-99; Workshop on the role of natural analogs in geologic disposal of high-level nuclear waste; San Antonio, TX (United States); 22-25 Jul 1991; Also available from OSTI as TI96001409; NTIS; GPO
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