This study was undertaken in an attempt to reduce known conservatism in a model that relates the composition of a high level waste glass to its propensity for nepheline crystallization upon slow cooling. Nepheline crystallization is to be avoided since it can reduce the chemical durability of a waste glass. A series of test glass compositions was selected, fabricated and characterized in support of this study. The results continued to identify compositional regions where the model remains conservative; however there was difficulty in identifying relationships among these compositions. An alternative nepheline discriminator was also evaluated but was shown to have difficulty in predicting nepheline crystallization in some of the slowly cooled glasses studied here. Further refinement of the current nepheline discriminator model may be possible using the data collected.
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