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The Effect of NaNO$$_{3}$$on Diffusion of CO$$_{3}$$$$^{2-}$$, Cl$$^{-}$$and I$$^{-}$$ Ions in Tuff

Ishidera, Takamitsu ; Sato, Haruo

The migration data of$$^{14}$$C,$$^{36}$$Cl and$$^{129}$$I nuclides are required for safety assessment of TRU waste disposal. The specific phenomena for TRU waste disposal such as the influence of NaNO$$_{3}$$concentration and the hyper alkaline groundwater due to degradation of cementitious materials should be considered for reliable safety assessment. In this study, the effective diffusion coefficient (De) for CO$$_{3}$$$$^{2-}$$, Cl$$^{-}$$and I$$^{-}$$ions in tuff were determined with various NaNO$$_{3}$$ concentrations under hyper alkaline condition. The obtained De values for CO$$_{3}$$$$^{2-}$$, Cl$$^{-}$$and I$$^{-}$$ions were on the order of 10$$^{-12}$$-10$$^{-11}$$m$$^{2}$$/s and decreased with increasing NaNO3 concentration. The De values for HDO and HTO were also decreased with increasing NaNO$$_{3}$$ concentration. Because the degradation of tuff samples was not observed by X-Ray diffractometry, SEM and EPMA, the decreases in the De values were considered to be due to the decreases in the diffusivities in free water. The apparent diffusion coefficient (Da) values for Cl$$^{-}$$ion with 5mol/dm$$^{3}$$ NaNO$$_{3}$$concentration and for CO$$_{3}$$$$^{2-}$$ion were lower than those of the other conditions. These low Da values suggested retardation in tuff samples.

Language

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Japanese

Report No.

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JNC TN8400 2005-018

Pages

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49 Pages

Publication Year/Month

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2005/09

Patent information

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PDF

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JNC-TN8400-2005-018.pdf:1.6MB

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no keyword

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Press Release

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Article of JAEA R&D Review

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