The Savannah River National Laboratory (SRNL) Frit Development Team recommended that the Defense Waste Processing Facility (DWPF) utilize Frit 418 for initial processing of high level waste (HLW) Sludge Batch 5 (SB5). The extended SB5 preparation time and desire to avoid a DWPF outage have necessitated the use of a frit that is already included on the DWPF procurement specification. Frit 418 has been used previously in vitrification of Sludge Batch 3 and was the transitional frit to Sludge Batch 4. Paper study assessments predict that Frit 418 will form an acceptable glass when combined with SB 5 over a range of waste loadings (WLs), typically 30-41 wt % based on nominal projected SB5 compositions. Frit 418 has a relatively high degree of robustness with regard to potential variation in the projected SB5 composition, particularly when the Na_2O concentration is varied. Frit 418 has not been designed to provide an optimal melt rate with SB5, but is recommended for initial processing of SB5 until experimental testing to optimize a frit composition for melt rate can be completed. Melt rate performance can not be predicted through the paper study assessments and must be determined experimentally.
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