[1I04-07] Vitrification 2

[1I04] MoO₃ solubility and durability of simulated radioactive waste glass containing V₂O₅

*Minako Nagata¹, Toshiaki Ohira¹, Toru Sugawara¹ (1. Akita University, Graduate School of Engineering Science)

Keywords:High-level radioactive waste, Vitrified waste, MoO3 solubility

The molybdenum phase is a problem in the high-level radioactive waste because it decreases chemical durability of the glass. In addition, waste glass dissolves when exposed to water, and the glass durability is different depending on its composition. Both high MoO₃ solubility and durability are required for vitrified waste. In this study, we investigate the effect of V₂O₅ addition on MoO₃ solubility and durability of glass. Phase equilibrium experiments were performed at 1200℃ for a glass of the current composition and a glass of the composition with added V₂O₅, and it was found that the addition of V₂O₅ increased MoO₃ solubility. The glass with increased MoO₃ solubility will be tested for durability.