Robert Andrews - US Nuclear Waste Technical Review Board

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Radionuclide Transport Processes • Transport processes include advection, dispersion, matrix diffusion and retardation • Advection occurs primarily through fractures in tuff aquifers and through matrix in alluvial aquifer • Transport characteristics differ between tuff and alluvium 00414PR_SZ_NRC_<strong>Andrews</strong>.ppt 40
Site Scale Radionuclide Transport • Groundwater flow models provide projections of flow paths and flow rates • Transport model provide projections of flow velocities and radionuclide transport times between the point radionuclides enter the saturated zone to the point they are withdrawn from the well used by the hypothetical person • Although transport model also project the spatial variation in concentration along the flow path, this information is not used due to the conservative assumption that all the activity is captured by the well – therefore only activity flux is required – concentration of water in well (in Ci/m 3 ) = activity flux (in Ci/yr) divided by the annual water demand (3.7 million m 3 /yr) 00414PR_SZ_NRC_<strong>Andrews</strong>.ppt 41
Page 1 and 2: U.S. Department of Energy Office of
Page 3 and 4: Components Affecting Technical Basi
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: UTM Northing (m) 4090000 4085000 40
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

Robert Andrews - US Nuclear Waste Technical Review Board

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