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Report No.
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Fundamental study on HLW glass corrosion and mineralization, II; Document prepared by other organization, based on the trust contract

Inagaki, Yaohiro*

The purpose of this study is to understand, qualitatively and quantitatively, the alteration-phase formation and associated elemetal release during aqueous corrosion of HLW glass in order to establish the validation for long-term corrosion/leaching model. Static corrosion tests were performed with a simulated HLW glass, P0798 glass, in alkalline solutions (NaOH, KOH, DIW) at elevated temperatures, in order to accelerate the reaction, as a function of temperatute, time and alkalline concentration. Crystalline alteration-phases formed in the corroded glass were analyzed by use of XRD and electron microscopies, and the solution concentrations of dissolved elements were measured by use of ICP-MS. The results indicated that; (1)Analcime or Na-beidellite or both of them form during the corrosion depending on the conditions, (2)In addition to solution pH, temperature, solution concentrations of alkalline elements and silicic acid sensitively affect formation of analcime and Na-beidellite, (3)Thermodynamic calculation based on the published data of equilibrium constant cannot evaluate the empirical alteration phase formation, (4)At the conditions where only Na-beidellite forms, the glass dissolution rate is slow, while at the conditions where analcime forms the glass dissolution rate is extremely fast, (5)At the conditions where only Na-beidellite forms, the glass dissolution proceeds in proportion to square root of time, which suggests the process is diffusion-controlled, (6)Most of Cs in the glass is retained in the alteration-phases by sorption onto Na-beidellite or incorporation into analcime.

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