Characterization of Defense Waste Processing Facility (DWPF) Glass and Deposit Samples from Melter No.2
This page was intentionally left blank WSRC-TR-2003-00504, Rev. 0 v EXECUTIVE SUMMARY The Defense Waste Processing Facility (DWPF) Engineering requested characterization of three glass samples that were taken from Melter #2 after the waste loading had been increased, e.g. after the new quasicrystalline liquidus model had been implemented and after DWPF switched from processing with Frit 200 to Frit 320. These samples were taken after DWPF observed very rapid buildup of deposits in the upper
... ts in the upper pour spout bore and on the pour spout insert while processing the high waste loading (~38 wt% feedstock). Rapid deposition in these locations had not occurred prior to this and, in turn, stopped after waste loading decreased. These samples were evaluated at SRTC using various analytical techniques for potential impacts on pouring problems recently experienced by the DWPF. The pour stream sample was determined to be homogenous, amorphous, and representative of SME/MFT batch 245. The calculated viscosity from the pour stream analysis was within 2.5 poise of the MFT-245 Product Composition Control System (PCCS) prediction. The calculated liquidus from the pour stream analysis was within 10°C of the MFT-245 PCCS prediction. The glass REDOX was within 0.03 of the target and the waste loading (based on the reported Li 2 O) was within 3.8 wt% of the MFT-245 target. This indicated that the viscosity, liquidus, and REDOX models are keeping DWPF processing in control. There was no crystallization observed in the pour stream sample.