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Surface Complexation Model Prediction of Np and Pu Distribution Coefficients

by P. E. Mariner, INTERA, Inc, Austin, United States,
R. E. Jackson, INTERA, Inc, Austin, United States,



Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1993

Abstract:

Robust estimates of radionuclide sorption coefficients (K_d) are needed to estimate radionuclide retardation during ground-water transport from a radioactive waste repository to the biosphere. It is demonstrated that surface complexation modeling (SCM) can provide not only a sensitivity analysis of the critical variables affecting radionuclide transport in granitic rocks but also develop geochemically robust K_d data bases for systems models. In addition, this paper contains (1) the determination and development of a chemical reaction data base for Pu and Np aqueous and adsorbed species, (2) a sensitivity analysis of Pu and Np sorption over realistic ranges of pH, pe, specific surface area and the concentration of radionuclides and aqueous and adsorbed organic matter, and (3) an assessment of the effects of variations in these variables on Pu and Np K_d values.

Subject Headings: Sensitivity analysis | Radioactive wastes | Radioactive materials | Groundwater pollution | Chemical wastes | Waste storage | Waste disposal

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