Hanford Waste Vitrification Plant technical manual

Tank waste remediation system phase I high-level waste feed processability assessment report

“…Scoping tests were conducted to assess the effects of adding up to 5 wt% fluoride, 5 wt% BaO, 5 wt% MnO,, 2 wt% MOO,, and 2 wt% NiO to HW39 borosilicate glass (Larson 1989). During the performance of these tests, only 60 to 80 percent of the fluoride was retained in the sample glass.…”

“…In a study of sulfate in borosilicate glass, the Fe+'/Fe+, ratio was systematically varied from 0 to 2.5 for glasses in which 0.5 and 1.0 wt%sulfate wereadded WNCAW at 25 percent WOL (Larson 1989, Bates et al 1985. The sulfate solubility did not change for the sample with 0.5 wt% sulfate over the REDOX range of interest (0.0 to 0.3).…”

Hanford high-level waste melter system evaluation data packages

“…The HLW melters can have chrome refractories throughout the melter because the color of the product glass is not important At 1OS0°C to llS0°C, reported colTOsion rates for carborundum K-3 in contact with borosilicate glass were 10 to 20 J.IIIlI'day at the melt line, and less than 10 J.IIIlI'day below the glass surface. The K-3 corrosion rate measured during a rebuild of the PSCM at PNL was 4 to 8 J.IIIlI'day (Larson 1989a). The fused cast refractory in the previous HWVPIDWPF design was 12 in.…”

“…Failure of the plenum refractory has mainly been associated with improper hangers or inadequate allocation for thermal expansion (Larson 1989b). …”

“…--Spinels: for several of the Hanford Site wastes, spinels (iron, chrome, nickel compounds) are the first crystals to form as NCAW glass cools. The Waste Acceptance Preliminary Specifications (WAPS) do not specify a limit for the amount of crystalline material in the glass (Larson 1989). The concern regarding formation of spinels (or any crystalline phase) is that the crystals will either reduce the durability of the waste form or affect the operation of the melter by filling the melt cavity with crys~s.…”