Abstract
The dissolution of the United Kingdom’s vitrified high-level-waste simulant, CaZn MW28, was investigated following the Product Consistency Test-B protocol for 112 d at 90 °C and in ultra-high-quality water. Residual rate dissolution (stage II) and rate resumption (stage III), after 28 d, was observed. Thermodynamic modelling suggested that solutions were saturated with respect to Mg- and Zn-bearing phases, and the presence of Mg- and Zn-smectite clays was tentatively observed. The formation of these phases was concurrent with a significant increase in the dissolution rate, similar to Stage III behavior seen in other nuclear waste simulant glass materials, indicating that the addition of Mg and Zn to high-level-waste glass (7.3 wt. % combined) significantly influences the dissolution rate.
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Fisher, A.J., Harrison, M.T., Hyatt, N.C. et al. The dissolution of simulant UK Ca/Zn-modified nuclear waste glass: Insight into Stage III behavior. MRS Advances 5, 103–109 (2020). https://doi.org/10.1557/adv.2020.50
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DOI: https://doi.org/10.1557/adv.2020.50