Electrometallurgical Techniques for DOE Spent Fuel Treatment An Assessment of Waste Form Development and Characterization (1999) / Chapter Skim
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C Meeting Summary, January 28-29, 1999
C Meeting Summary, January 28-29, 1999
Pages 37-48
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From page 37... ...
Robert W Benedict spoke regarding the Spent Fuel Treatment Demonstration Project Status.
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From page 38... ...
Tests include a run with the Mk-V-S repeating operating conditions used in run Mk-V-7F with full loading of undissolved fuel segments in the anode baskets in the outer channel and empty baskets in the inner channel. Also, the operating conditions used in run Mk-V-S, except using full loading of undissolved fuel segments in the anode baskets in both chariness will also be performed (Mk-V-9~.
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Documents required of the wastefonn producer include waste-acceptance product specifications, a waste compliance plan, and a waste qualification report. These are sent to the repository operator for the license application, which also requires performance assessment of the waste.
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Repository perfo~ance assessments need uncertainties for the degradation/release rate model, physical properties, the source term, and phase stability. Waste specifications need ranges for phase distribution, chemical composition, the product consistency method, phase stability, and hazardous properties.
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The waste qualification report will be written. The product consistency method will be finalized; the waste process qualification tests will be performed with L-scale equipment.
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The Solution Exchange Test distinguishes between release by dissolution of free salt, release of occluded matenal, and framework dissolution. The product consistency tests study solution effects on dissolution behavior of the CWF under concentrated solution conditions.
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One- and three-day tests are used to estimate the forward rate. Product consistency tests (PCTs)
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The conclusions from these models are that sodalite dissolves slower than HEW under the considered flow conditions, that the comparison to HEW is conservative, and that future calculations will include temperature and pH effects. Bill Ebert addressed Current Work and Test Matnx.
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Expenmental testing encompasses study of alloy microstructures, mechanical and thermophysical properties measurement, and corrosion testing. The modeling approach uses known stainless steel degradation mechanisms as a basis for MWF modeling.
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The purpose of electrochemical corrosion testing is to obtain a relative measure of corrosion rates and to screen out alloy compositions that may not be suitable for repository disposal. The corrosion rate measurement by the linear polarization method is based on ASTM G59.
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Product consistency tests (PCT) determine the release rates of all elements, in particular Pu, Cs, arid I
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From page 48... ...
~ National Research Council, Electrometallurgical Techniques for DOE Spent Fuel Treatnent: Status Report on Argonne National Laboratory 's R&D Activity as of Fall I 998, Nahonal Academy Press, Washington, D.C., 1999.
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