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2.0 INTRODUCTION AND BACKGROUND Currently, DWPF is operating using a sludge-only processing flowsheet. Since start-up, DWPF has modified its operating flowsheet to adjust for processing of the incoming or existing sludge batch. For each sludge batch, SRTC has performed non-radioactive and radioactive sludge runs to evaluate potential chemical processing issues, quantify the potential hydrogen generation rates that will be seen in DWPF, and to estimate the required acid stoichiometry. The next sludge batch, SB3, which is primarily Tank 7 sludge, is expected to contain several components that are considered non-typical to DWPF sludge and also higher levels of noble metals than previously processed sludge batches. In addition to the Tank 7 contents, it has been proposed to add Am/Cm feed and an H-Canyon slurry containing precipitated Pu with Gd to SB3. The studies discussed in this report concentrate on the effects of the H-Canyon addition on SRAT processing with simulated sludge, Gd, and a surrogate material for the actinides in the H-Canyon slurry. Preliminary information on SRAT processing of the other non-typical components of Tank 7 (sand, coal, and sodium oxalate) is also included as part of the Pu and Gd investigations.

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