Robert Andrews - US Nuclear Waste Technical Review Board

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Calculated Radionuclide Mass Breakthrough • Plot indicative of nominal properties • Mass flux for non sorbing radionuclides indicates the bulk of the breakthrough occurs between several hundred and several thousand years – consistent with C-14 interpretations • Moderately sorbing species (Np-237) only ~ 5% breakthrough at 10,000 years 00414PR_SZ_NRC_<strong>Andrews</strong>.ppt 50
Calculated Radionuclide Breakthrough – Technetium • Technetium is a non-retarded radionuclide • Median Technetium breakthrough occurs at about 500 years with a distribution from less 100 to more than 10,000 years 00414PR_SZ_NRC_<strong>Andrews</strong>.ppt 51
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 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: Sorption of Radionuclides on Alluvi
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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