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of TTT for performing the engineering scale FBSR studies on a nonradioactive Hanford Tank Blend waste and providing the FBSR bed and fines materials produced for the SRNL WFO studies supported by ART. This data was used for comparison to non-radioactive and radioactive studies performed at SRNL at the bench-scale for the same Hanford Tank Blend waste as detailed in this report. The authors would also like to thank TTT for their technical guidance and support during the execution of the radioactive work scope at SRNL. The authors would like to thank the following SRNL personnel: Holly Hall and all the regulatory support personnel including Bill Wilson, Kerri Crawford, and Amy Blunt for all the guidance that has helped SRNL perform these treatability studies in compliance with Resource Conservation & Recovery Act (RCRA) waste handling procedures.The SRNL researchers would like to thank Babb Attaway, who is manager of the SRNL Shielded Cell Operations (SCO) group, and the SCO technical team consisting of Carolyn Conley,

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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.