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Report No.
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Fundamental Study on HLW Glass Corrosion and Mineralization (IV)

Inagaki, Yaohiro*

The purpose of this study(fiscal year 2001-2004) is to understand, qualitatively and quantitatively, the glass corrosion and associated elemetal release under assumed disposal conditions for long-term referring to geochemical mechanism in order to establish the validation for long-term corrosion/leaching model. This report(fiscal year 2004) discusses glass size dependence of the glass corrosion rate and leaching of Se from the glass on the basis of the results of corrosion tests performed with P0798 simulated HLW glass with four different sizes. The conclusions are; (1) the glass corrosion rate for the glass with four different sizes can be analyzed by use of hydration model (water diffusion model), and value of the diffusion coefficient is evaluated to be 10$$^{-21}$$m$$^{2}$$/s at 120$$^{circ}$$C, (2) Se leaches from the glass congruently with Si, and the leached Se cannot precipitate under the present conditions, (3) the experimental results on glass corrosion rate including previous results of the temperature dependence and the rate in the presence of bentonite can be explained by use of the water diffusion model, which indicates that application of this model is available for confirming validity of the long-term corrosion/leaching model.

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