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Solubility and Leaching of Radionuclides in Site Decommissioning Management Plan (SDMP) Soil and Ponded Wastes (NUREG/CR-6821)

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Publication Information
Abstract

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NUREG/CR-6821 (PDF - 691 KB)

Publication Information

Manuscript Completed: May 2003
Date Published: June 2003

Prepared by A.R. Felmy, V.L. LeGore, S.A. Hartley

Pacific Northwest National Laboratory
P.O. Box 999
Richland, WA 99352

P. Reed, NRC Project Manager

Prepared for
Division of Systems Analysis and Regulatory Effectiveness
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001
NRC Job Code W6409

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Abstract

Samples of disposed wastes from one former and two current U.S. Nuclear Regulatory Commission Site Decommissioning Management Plan Sites, labeled Sites D, E, and F, were studied to determine 1) the key radionuclides and their concentrations present in the waste, 2) the solubility limits and solubility limiting phases for these radionuclides, 3) the rate of attainment of solubility equilibrium, 4) the observed leaching rate for radionuclides that may or may not be solubility controlled, and 5) identify, if possible, the potential for radiocolloid formation. To achieve these goals, batch studies were conducted over ranges of solution pH values (2–12), solid to solution ratio, and particle size. In addition, flow-through column studies were conducted of selected samples to help verify the mechanisms and predictive relations identified in the batch experiments. The results show that the major radionuclides present in the wastes varied widely between the three sites.