Abstract
The borosilicate glass containing 20 wt% of simulated HLW oxides was annealed at 700°C for 1000 h to accelerate devitrification. This heat treatment caused an increase of 5.2 vol% in crystallinity. Monolithic samples of the devitrified and the as-prepared glasses were subjected to the Soxhlet leach test for 2 months. The concentrations of Sr, Ba, Mo, B, Cr, Fe, Na, and Cs in leachates were analyzed. The comparison of leachability of the above two kinds of glasses gave the following results: after devitrification, [1] Sr, Ba, Mo, and B became less leachable because of low solubility of (Sr, Ba, RE)MmO 4 and (RE)BSiO 5, while [2] the leach rate of Na corrected by the actual surface area increased by a factor of about 3 and was nearly constant throughout the leach test.
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