Robert Andrews - US Nuclear Waste Technical Review Board

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Outline • Introduction - Objectives • Regional Ground-water Flow Processes • Regional Hydrochemistry • Site Scale Ground-Water Flow Processes • Site-Scale Radionuclide Transport Processes • Results of Radionuclide Transport Model • Comparison to Alternative Model • Summary and Conclusions 00414PR_SZ_NRC_Andrews.ppt 2
Components Affecting Technical Basis of Post-Closure Safety Analysis • Saturated zone flow and transport is one of 14 components of post closure safety • Saturated zone provides pathways for potential release of radionuclides to reasonably maximally exposed individual • Saturated zone affects performance in both nominal scenario class and disruptive event scenario classes initiated by seismic and volcanic events 00414PR_SZ_NRC_Andrews.ppt 3
Page 1: U.S. Department of Energy Office of
Page 5 and 6: Introduction - Performance Assessme
Page 7 and 8: Conceptual Framework for Saturated
Page 9 and 10: Major Physiographic Features of Dea
Page 11 and 12: Cumulative Recharge Estimates in De
Page 13 and 14: Discharge Locations in Death Valley
Page 15 and 16: Groundwater Withdrawals in the Deat
Page 17 and 18: Potentiometric Surface of Death Val
Page 19 and 20: Geochemistry Signatures and Inferre
Page 21 and 22: Regional Variation in Uranium and U
Page 23 and 24: Comparison of Inferred and Simulate
Page 25 and 26: Boreholes used in the Development o
Page 27 and 28: Site Scale Geologic Representation
Page 29 and 30: Extent of Alluvium Identified in Ny
Page 31 and 32: Site Scale Boundary Fluxes Compared
Page 33 and 34: C-Wells Stratigraphy and Hydraulic
Page 35 and 36: Site Scale Modeled and Observed Pot
Page 37 and 38: Calculated Site Scale Groundwater F
Page 39 and 40: UTM Northing (m) 4090000 4085000 40
Page 41 and 42: Site Scale Radionuclide Transport
Page 43 and 44: Matrix Diffusion Coefficient Evalua
Page 45 and 46: Single Hole Tracer Test at Alluvial
Page 47 and 48: Carbon-14 versus Delta Carbon-13
Page 49 and 50: Sorption of Radionuclides on Alluvi
Page 51 and 52: Calculated Radionuclide Breakthroug
Page 53 and 54:
Calculated Radionuclide Breakthroug
Page 55 and 56:
Comparison to Alternative Represent
Page 57 and 58:
NRC/CNWRA Transport Model Results
Page 59 and 60:
Summary and Conclusions - Radionucl
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Robert Andrews - US Nuclear Waste Technical Review Board

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