Feed specification for the double-shell tank/single shell tank waste blend for high-level waste vitrification process and melter testing

Abstract

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Hanford tank waste simulants specification and their applicability for the retrieval, pretreatment, and vitrification processes

“…The procedure involved the addition of sodium hydroxide to metal nitrate solutions to form precipitates and to adjust the concentration of other components by directly adding the oxides, hydroxides, fluorides, and sulfates of those elements to match the chemical composition of the NCAW waste. Similar procedures were used to prepare double shell tank/single shell tank waste blend (Tracy et al 1995) and request for proposal blend @?P) (Russell and Smith 1996). In the following sections, the simulant specification for these three types of HLW slurry waste simulants is presented.…”

“…The double shell tanldsingle shell tank waste blend (waste blend) simulant (Tracy et al 1995) was developed to emulate an anticipated composition of HLW feed representing a blend of the waste from 177 single shell and double shell tanks. The waste blend composition shown in TabIe 5.2 was based on the normalized Track Radionuclide Components (TWIC) inventory, historical tank da~and assumptions on the pretreatment of the waste.…”

“…Also, Cyanide (CIT) addition as NaZNi.Fe(CN)cwasproposed. Because of uncontrollable exothermic reactions of NaZN@e(cN)cin the presence of sodium nitrate it was suggested that the use of NazNiFe(CN)c in simulants should be employed only to meet specific testing objectives and its necessity should be carefully considered (Tracy et al 1995).…”