3 4.4 Compositional Analysis for Core #2. Run #5. Sample #1A 4.5 Estimated Content of Nonradioactive Inorganic Elements in the 116-B-6A ISV Block ....... 4.6 Radionuclide Concentrations Within the 116-B-6A ISV Block 4.7 Pre-and Post-Test Analytical Results for 116-B-6A Scrub Solution. 4.8 Selected Immobilization Efficiencies for the 116-B-6A Crib ISV Demonstration 4.9 MCC-1 Test Results for the 116-B-5A Crib ISV Block 4.10 TCLP Results for 116-B-6A Block Samples 56

This report describes engineering-scale in situ vitrification(ISV) electrode tests conductedby Pacific NorthwestLaboratory(PNL) for the U.S. Departmentof Energy (DOE). (a) The purposeof these tests was to establish baseline data to serve as a foundationon which to improvethe design of standard rd graphite rod electrodes,which are currentlyused in all applications. Changes in electrodedesign are proposed as one method to increase ISV melt. depths that typicallyreach about 5 m.

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