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EXAMPLE Dose Calculation for Chronic Surface Water Releases Using GENII V.2

EXAMPLE Dose Calculation for Chronic Surface Water Releases Using GENII V.2. FRAMES-2.0 Workshop U.S. Nuclear Regulatory Commission Bethesda, Maryland November 15-16, 2007 Pacific Northwest National Laboratory Richland, Washington. Purpose. Demonstrate Common Dose Calculation

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EXAMPLE Dose Calculation for Chronic Surface Water Releases Using GENII V.2

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  1. EXAMPLEDose Calculation forChronic Surface Water Releases Using GENII V.2 FRAMES-2.0 Workshop U.S. Nuclear Regulatory Commission Bethesda, Maryland November 15-16, 2007 Pacific Northwest National Laboratory Richland, Washington

  2. Purpose • Demonstrate Common Dose Calculation • Source term from AP-1000 Design Control Document • Annual-average release • Long-term release and environmental accumulation (30 years) • Various options for surface water dispersion modeling • Individual Dose for 4 Age Groups • Approximate population distribution from EIS 2

  3. Problem Description Calculate the dose from radionuclides discharged into a river to a maximally exposed adult, teen, child and infant. The discharge flow rate is 10 cfm and the river flow is 1000 cfm. The exposure pathways include using the river water for drinking water, swimming, boating and shoreline sunbathing, fishing, and irrigation of crops and pastures. Use dose conversion factors from Federal Guidance-13. The source term is provided by the GALE code for a routine liquid pathway release. 3

  4. Source Term Definition Table 11.2-7 (Sheet 1 of 2) RELEASES TO DISCHARGE CANAL (Ci/Yr) CALCULATED BY GALE CODE Turbine Nuclide Shim Bleed Misc. Wastes Building Total Corrosion and Activation Products Na-24 0.00053 0.0 0.00008 0.00163 Cr-51 0.00068 0.0 0.0 0.00185 Mn-54 0.00048 0.0 0.0 0.00130 Fe-55 0.00037 0.0 0.0 0.00100 Fe-59 0.00008 0.0 0.0 0.00020 Co-58 0.00125 0.0 0.00001 0.00336 Co-60 0.00016 0.0 0.0 0.00044 Zn-65 0.00015 0.0 0.0 0.00041 W-187 0.00004 0.0 0.0 0.00013 Np-239 0.00008 0.0 0.0 0.00024 4

  5. Modules Source, Surface Water Transport • GENII Radionuclide Database Selection • Source (User-defined source term) – WFF Surface Water Module • GENII V.2 Surface Water Module Exposure/Intake/Risk • GENII V.2 Exposure Pathways Module • GENII V.2 Receptor Intakes Module • GENII V.2 Health Impacts Module • Various dose viewers 5

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  7. “Source-Term” Module Input 7

  8. Surface Water Dispersion Module Input 8

  9. Chronic Exposure Module Input 9

  10. Receptor Intake Module • NRC age categories for dose conversion factors historically were defined in NUREG-0172 (Hoenes & Soldat 1977): • Infant 0-1 year • Child 1-11 years • Teen 11-17 years • Adult 17+ years 10

  11. Output Results 11

  12. Summary • GENII V.2 has many capabilities for evaluating releases of radionuclides into surface waters • Source terms may be input directly; future enhancements may include “GALE-like” features • Environmental models may require a lot of data • Doses can be calculated various ways (many types of individuals or a population group) • Future enhancements could replicate the various cooling pond models 12

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