ML061460098

License Termination Plan, Rev 0, Table of Contents

ML061460098
Person / Time
Site:	Rancho Seco
Issue date:	04/30/2006
From:	Sacramento Municipal Utility District (SMUD)
To:	Document Control Desk, NRC/FSME
References
MPC&D 06-035, NQA 06-015
Download: ML061460098 (9)

Text

Rancho Seco Nuclear Generating Station License Termination Plan

Rancho Seco License Termination Plan Revision 0 Table of Contents April 2006 TABLE OF CONTENTS 1.0 GENERAL INFORMATION .......................................................................................................1-1 1.1. Purpose..........................................................................................................................................1-1 1.2. Scope.............................................................................................................................................1-1 1.3. Historical Background and Site Description.................................................................................1-2 1.4. Decommissioning Approach.........................................................................................................1-3 1.5. Plan Summary...............................................................................................................................1-5 1.6. License Termination Plan Change Process...................................................................................1-9 1.7. License Termination Plan Information Contact..........................................................................1-10 1.8. References...................................................................................................................................1-10 2.0 SITE CHARACTERIZATION.....................................................................................................2-1 2.1 Historical Site Assessment Summary ...........................................................................................2-1 2.2 Hydrogeological Investigations ..................................................................................................2-24 2.3 Pre-Characterization Scoping Surveys........................................................................................2-35 2.4 Site Characterization Survey Methods........................................................................................2-40 2.5 Summary of Initial Characterization Survey (ICS) Results........................................................2-48 2.6 Continuing Characterization .......................................................................................................2-58 2.7 Summary .....................................................................................................................................2-58 2.8 References...................................................................................................................................2-91 3.0 IDENTIFICATION OF REMAINING DECOMMISSIONING ACTIVITIES...........................3-1 3.1 Introduction...................................................................................................................................3-1 3.2 Completed Decommissioning Activities and Tasks .....................................................................3-2 3.3 Future Decommissioning Activities .............................................................................................3-7 3.4 Radiological Impacts of Decontamination and Dismantlement Activities .................................3-11 3.5 Site Description after License Release........................................................................................3-14 3.6 Coordination with Outside Entities.............................................................................................3-14 3.7 References...................................................................................................................................3-16 4.0 SITE REMEDIATION PLAN ......................................................................................................4-1 4.1 Remediation Actions and ALARA Evaluations ...........................................................................4-1 4.2 Remediation Actions.....................................................................................................................4-1 4.3 Remediation Activities Impact on the Radiation Protection Program ..........................................4-4 4.4 ALARA Evaluation ......................................................................................................................4-5 4.5 Unit Cost Estimates ......................................................................................................................4-9 4.6 Radionuclides Considered for ALARA Calculations .................................................................4-14 4.7 ALARA Calculation Results.......................................................................................................4-15 4.8 References...................................................................................................................................4-15 5.0 FINAL STATUS SURVEY PLAN ..............................................................................................5-1 5.1 Introduction...................................................................................................................................5-1 5.2 Development of Survey Plan ........................................................................................................5-5 5.3 Survey Design and Data Quality Objectives...............................................................................5-21 i

Rancho Seco License Termination Plan Revision 0 Table of Contents April 2006 5.4 Survey Methods and Instrumentation .........................................................................................5-31 5.5 Data Collection and Processing ..................................................................................................5-46 5.6 Data Assessment and Compliance ..............................................................................................5-48 5.7 Reporting Format ........................................................................................................................5-53 5.8 Final Status Survey Quality Program .........................................................................................5-54 5.9 References...................................................................................................................................5-62 6.0 COMPLIANCE WITH THE RADIOLOGICAL CRITERIA FOR LICENSE TERMINATION6-1 6.1 Site Release Criteria......................................................................................................................6-1 6.2 Site Conditions..............................................................................................................................6-1 6.3 Source Term Assumptions............................................................................................................6-2 6.4 Dose Modeling Considerations.....................................................................................................6-5 6.5 Computational Model Used for Dose Calculations ......................................................................6-9 6.6 Derived Concentration Guideline Levels (DCGLs)....................................................................6-10 6.7 Derivation of Area Factors..........................................................................................................6-35 6.8 Comparison of Alternative Exposure Scenarios for Impacted Area Soils ..................................6-40 6.9 References...................................................................................................................................6-60 7.0 UPDATE OF SITE-SPECIFIC DECOMMISSIONING COSTS.................................................7-1 7.1 Introduction...................................................................................................................................7-1 7.2 Decommissioning Cost Estimate ..................................................................................................7-3 7.3 Decommissioning Funding Plan ...................................................................................................7-6 7.4 References.....................................................................................................................................7-9 8.0 SUPPLEMENT TO THE ENVIRONMENTAL REPORT..........................................................8-1 8.1 Summary .......................................................................................................................................8-1 8.2 Introduction and Purpose ..............................................................................................................8-1 8.3 Site Description After Unrestricted Release .................................................................................8-4 8.4 Impacts to the Post-Shutdown Decommissioning Activities Report ............................................8-4 8.5 Rancho Seco Site Environmental Description ..............................................................................8-5 8.6 Environmental Effects Of Decommissioning .............................................................................8-15 8.7 Overview Of Regulations Governing Decommissioning Activities and Site Release................8-24

8.8 REFERENCES

...........................................................................................................................8-31 TABLES 2-1 Personnel Observations Summary ................................................................................................2-5 2-2 Operational History Summary ......................................................................................................2-7 2-3 Discharge Canal Sediment..........................................................................................................2-12 2-4 Depression Area Soil Vendor Laboratory Results ......................................................................2-14 2-5 Area Designations.......................................................................................................................2-24 2-6 Well Construction and Water Elevation Data.............................................................................2-26 2-7 General Minerals Results from Analyses of Groundwater .........................................................2-31 ii

Rancho Seco License Termination Plan Revision 0 Table of Contents April 2006 2.8 Groundwater Monitoring Radiochemical Results.......................................................................2-34 2-9 Effect of Temporal Variability....................................................................................................2-38 2-10 Effect of Spatial Variability ........................................................................................................2-39 2-11 Gross Activity Variability Due to Plant Operations ...................................................................2-40 2-12 Cs-137 Variability Due to Plant Operations ...............................................................................2-40 2-13 Typical On-Site Characterization Detection Sensitivities...........................................................2-42 2-14 Vendor Laboratory Standard MDA Values ................................................................................2-43 2-15 Specific Soil Contamination Investigation Locations.................................................................2-46 2-16 Concrete Structure Nuclide Fraction ..........................................................................................2-47 2-17 Site Structures Below the DCGL ................................................................................................2-48 2-18 Special Area Locations ...............................................................................................................2-49 2-19 Activated Nuclide Fractions For Bioshield Concrete and Rebar ................................................2-50 2-20 Embedded Pipe Gamma- Emitting Nuclide Fractions ................................................................2-51 2-21 Embedded Piping Systems..........................................................................................................2-52 2-22 Buried Piping Nuclide Fractions and Ratio To Cs-137 ..............................................................2-53 2-23 Buried Piping Systems................................................................................................................2-53 2-24 Non-Impacted Systems ...............................................................................................................2-54 2-25 Impacted Soil Area Characterization Results .............................................................................2-54 2-26 Soil Nuclide Fractions.................................................................................................................2-55 2-27 Spent Fuel Cooler Pad Residual Soil Concentrations Comparison To NRC/ORISE Results ....2-55 2-28 Spent Fuel Pool Subsoil Residual Soil Concentrations, NRC/ORISE Results ...........................2-56 3-1 Schedule of Remaining Major Activities......................................................................................3-7 3-2 Solid Waste Effluent Release Report Summary .........................................................................3-12 3-3 Liquid Waste Effluent Releases..................................................................................................3-13 3-4 Gaseous Waste Effluent Releases ...............................................................................................3-14 4-1 Acceptable Parameter Values for Use in ALARA Analyses ......................................................4-11 4-2 ALARA Evaluation Results........................................................................................................4-15 5-1 Single Nuclide DCGLW Values for Detectable Radionuclides in Soil........................................5-6 5-2 Calculated Structural Surface Single Nuclide DCFs and DCGLWs..............................................5-7 5-3 Area Designations.......................................................................................................................5-11 5-4A Survey Unit Classifications - General Open Land Areas...........................................................5-12 5-4B Survey Unit Classifications - Site Surface Soils.........................................................................5-13 5-4C Survey Unit Classification - Paved Surfaces and Foundation Pads ...........................................5-14 5-4D Survey Area Characterization-Structures....................................................................................5-16 5-4E Survey Area Characterization - Remaining Buried and Embedded Pipe...................................5-18 5-5 Suggested Survey Unit Areas .....................................................................................................5-19 5-6 Scan Measurements ....................................................................................................................5-22 5-7 Investigation Levels ....................................................................................................................5-27 5-8 Calculated Surface Soil Area Factors .........................................................................................5-28 5-9 Calculated Structural Surface Area Factor Values .....................................................................5-29 5-10 Investigation Actions for Individual Survey Unit Measurements...............................................5-30 iii

Rancho Seco License Termination Plan Revision 0 Table of Contents April 2006 5-11 Typical FSS Survey Instrumentation ..........................................................................................5-36 5-12 Typical FSS Detection Sensitivities............................................................................................5-38 5-13 Interpretation of Sample Measurements When the WRS Test Is Used ......................................5-48 5-14 Interpretation of Sample Measurements When the Sign Test Is Used........................................5-49 6-1 Site-Specific Suite of Radionuclides for Use at Rancho Seco......................................................6-5 6-2 Sensitivity Analysis Radionuclide Concentrations .....................................................................6-14 6-3 Potential Parameter Correlations ................................................................................................6-15 6-4 Discounted Radionuclide Concentrations for Dose Evaluation..................................................6-17 6-5 Single Nuclide DCGL Values for Detectable Radionuclides .....................................................6-18 6-6 Maximum Allowable Radionuclide Mixture Concentrations .....................................................6-20 6-7 Peak of the Mean Dose vs Contaminated Layer Thickness........................................................6-20 6-8 Peak of the Mean Dose vs Discrete Contamination Pocket Depth .............................................6-21 6-9 Calculated Structural Surface Single Nuclide DCFs and DCGLs ..............................................6-24 6-10 Bulk Material Single Nuclide DCF and DCGL Values ..............................................................6-27 6-11 Containment Building Surface Single Nuclide DCF and DCGL Values for the Industrial Worker Building Inspection Scenario......................................................................................................6-30 6-12 Containment Building Surface Single Nuclide DCF and DCGL Values - Renovation/Demolition Scenario ......................................................................................................................................6-32 6-13 Embedded Pipe Annual Dose Rate By Building ........................................................................6-34 6-14 Single Nuclide DCGL Values for Detectable Radionuclides .....................................................6-36 6-15 Calculated Peak-of-the-Mean DSR Values.................................................................................6-37 6-16 Calculated Surface Soil Area Factors .........................................................................................6-38 6-17 Calculated Mean DSR Values for Structural Surface Area Factors ...........................................6-39 6-18 Calculated Surface Area Factor Values ......................................................................................6-40 6-19 Calculated Dose Using a Resident Farmer Scenario ..................................................................6-44 7-1 Summary of Remaining Decommissioning Costs in Year 2005 Dollars......................................7-6 8-1 Projected Population Growth ........................................................................................................8-6 8-2 Expected Extreme Wind Speeds ...................................................................................................8-9 8-3 Precipitation Climatology ...........................................................................................................8-10 8-4 Precipitation Intensity .................................................................................................................8-10 FIGURES 2-1 Rancho Seco Industrial Area Map ..............................................................................................2-60 2-2 Impacted Area.............................................................................................................................2-61 2-3 Area Designations.......................................................................................................................2-62 2-4 Locations of Borings Drilled and Sampled at Rancho Seco .......................................................2-63 2-5 Potentiometric Surface Map for Groundwater Beneth Rancho Seco, December 2005 ..............2-64 2-6 Piper Diagram for Groundwater Concentrations Beneath Rancho Seco ....................................2-65 2-7 Stiff Diagrams of Cation and Anion Concentrations in Groundwater Beneath and Upgradient from Ranch Seco.........................................................................................................................2-65 iv

Rancho Seco License Termination Plan Revision 0 Table of Contents April 2006 2-8 Spent Fuel Cooler Pad Soil Characterization Locations ............................................................2-66 2-9 Tank Farm Soil Characterization Locations, 810001 and 810002..............................................2-67 2-10 Spent Fuel Building-Diesel Generator Room Gap Soil Characterization Location, 826000......2-68 2-11 Effluent Water Course Soil Characterization Locations, 100001...............................................2-69 2-12 RHUT Area Soil Characterization Locations, 837000 ...............................................................2-70 2-13 Old Bechtel Building Soil Characterization Locations, 800004.................................................2-71 2-14 Auxiliary Building -20 and -29 El. Concrete Characterization Sample Locations, 813000 ...2-72 2-15 Auxiliary Building -47 El. Concrete Characterization Sample Locations, 813000 ..................2-73 2-16 Fuel Storage Building Concrete Characterization Sample Locations, 812000...........................2-74 2-17 Reactor Building 40 El Concrete Characterization Sample Locations, 811000........................2-75 2-18 Reactor Building 0 El. Concrete Characterization Locations, 811000......................................2-76 2-19 Reactor Building -27 El. Concrete Characterization Locations, 811000..................................2-77 2-20 Turbine Building -10 El. Concrete Characterization Locations, 826000..................................2-78 2-21 Turbine Building 0 El. Concrete Characterization Locations, 826000......................................2-79 2-22 Reactor Building Activated Concrete Characterization Locations, 811000 ..............................2-80 2-23 Activation Depth Associated with Each Core at the Respective Elevations...............................2-81 2-24 Eu-152 Concentration for the Mid-Core Region ........................................................................2-81 2-25 Turbine Building Grade Level Drains, 826000 ..........................................................................2-82 2-26 Turbine Building 40 El. Drains, 826000 ...................................................................................2-83 2-27 Auxiliary Building -20El. Drains..............................................................................................2-84 2-28 Auxiliary Building -47 El. Drains.............................................................................................2-85 2-29 Spent Fuel Pool Drains ...............................................................................................................2-86 2-29a Spent Fuel Pool Drains 0 Elevation...........................................................................................2-87 2-30 Reactor Building Drains -27 El..................................................................................................2-88 3-31 Fuel Storage Building Soil .........................................................................................................2-89 3-1 Dose-Estimate and Actual (Person-Rem) ...................................................................................3-15 5-1 FSS Process Overview................................................................................................................5-60 5-2 Area Designations.......................................................................................................................5-61 6-1 Rancho Seco Reservoir and Recreation Area .............................................................................6-46 6-2 Rancho Seco Switchyard and ISFSI ...........................................................................................6-47 6-3 Rancho Seco Photovoltaic Generating Facility ..........................................................................6-48 6-4 Aerial Photograph of the Combined Cycle Cosumnes Power Plant ...........................................6-49 6-5 RESRAD Parameter Selection Process.......................................................................................6-50 6-6 Peak of the Mean Dose vs Contaminated Layer Thickness for Principal Dose Contributors ....6-51 6-7 Peak of the Mean Dose vs Contaminated Layer Thickness for Minor Dose Contributors.........6-52 6-8 Peak of the Peak of the Mean Dose vs Discrete Contamination Pocket Depth ..........................6-53 6-9 Time of the Peak of the Mean Dose vs Discrete Contamination Pocket Depth..........................6-54 6-10 RESRAD-BUILD Parameter Selection Process .........................................................................6-55 6-11 Surface Soil Area Factors for Gamma Emitters..........................................................................6-56 6-12 Surface Soil Area Factors for Beta Emitters...............................................................................6-57 6-13 Structural Surface Area Factors ..................................................................................................6-58 v

Rancho Seco License Termination Plan Revision 0 Table of Contents April 2006 6-14 Calculated Dose Using a Resident Farmer Scenario ..................................................................6-59 7-1 Summary of Remaining Decommissioning Costs in Year 2005 Dollars......................................7-8 8-1 Rancho Seco Site Map ................................................................................................................8-27 8-2 Wind Roses .................................................................................................................................8-29 8-3 Yearly Wind Roses .....................................................................................................................8-30 8-4 Ground Water Contour Map .......................................................................................................8-31 APPENDICES 2-A Miscellaneous Historical Construction Photographs ..................................................................2-93 2-B Site and Structure Drawings With Sample and Survey Locations............................................2-111 4-A Unit Cost Values .........................................................................................................................4-17 6-A RESRAD Parameters for Soil Dose Modeling Probabilistic Analysis .......................................6-63 6-B RESRAD Sensitivity Analysis Distribution Parameters.............................................................6-79 6-C RESRAD Distribution Parameter Sensitivity Analysis Results..................................................6-83 6-D RESRAD Parameters for Probabilistic Analysis of Discounted Radionuclides .........................6-85 6-E Distribution Parameters and Sensitivity Analysis Results for Discounted Radionuclides .......6-111 6-F Parameters for Probabilistic Analysis of Varying Contamination Layer Thickness ................6-123 6-G Dose Modeling Distribution Parameters - Industrial Worker Scenario ...................................6-139 6-H Parameters for Probabilistic Analysis of Discrete Pockets of Contamination ..........................6-143 6-I Distribution Parameters for Analysis of Discrete Pockets of Contamination...........................6-159 6-J RESRAD-BUILD Parameters for Rancho Seco Structural Surfaces Sensitivity Analysis ......6-163 6-K Sensitivity Analysis Distribution Parameters and Sensitive Parameter Results .......................6-173 6-L Radionuclide Specific RESRAD-BUILD Sensitive Parameters...............................................6-175 6-M Parameters for Rancho Seco Structural Surfaces DCGL Derivation........................................6-179 6-N Parameters for Rancho Seco Bulk Material Sensitivity Analysis.............................................6-191 6-O Distribution Parameters for Analysis of Bulk Material and Sensitive Parameter Results ........6-197 6-P RESRAD-BUILD Input Parameters for Derivation of Containment Inspection Single Nuclide DCFs .........................................................................................................................................6-199 6-Q Parameters for Containment Building DCGL Sensitivity Analysis..........................................6-213 6-R Statistical Distribution Parameters and Sensitive Parameter Results for Containment Building DCGLs ......................................................................................................................................6-227 6-S Parameters for Surface Soil Area Factor Dose Modeling Probabilistic Analysis.....................6-233 6-T Surface Soil Area Factor Dose Modeling Distribution Parameters ..........................................6-249 6-U Parameters for Structural Surface Area Factor Derivation .......................................................6-253 6-V Distribution Parameters for Structural Surface Area Factor Derivation ...................................6-259 6-W Parameters for Sensitivity Analysis of Detected Radionuclides - Resident Farmer Scenario .6-261 6-X Sensitivity Analysis Distribution Parameters and Sensitive Parameter Results for Detected Radionuclides - Resident Farmer Scenario...............................................................................6-279 6-Y Parameters for Sensitivity Analysis of Discounted Radionuclides, Resident Farmer Scenario6-283 vi

Rancho Seco License Termination Plan Revision 0 Table of Contents April 2006 6-Z Distribution Parameters and Sensitive Parameter Results for Discounted Radionuclides, Resident Farmer Scenario .........................................................................................................6-319 vii

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