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Diffusion of Technetium in Compacted Bentonites in the Reducing Condition with Corrosion Products of Iron

Published online by Cambridge University Press:  03 September 2012

Yuji Kuroda ,
K. Idemitsu ,
H. Furuya ,
Y. Inagaki  and
T. Arima
Yuji Kuroda
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka 812–81, JAPAN
K. Idemitsu
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka 812–81, JAPAN
H. Furuya
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka 812–81, JAPAN
Y. Inagaki
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka 812–81, JAPAN
T. Arima
Affiliation:
Department of Nuclear Engineering, Kyushu University, Fukuoka 812–81, JAPAN
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Abstract

In the vicinity of a high-level waste repository, corrosion of carbon steel overpacks will create a reducing environment. Reducing conditions are expected to retard the migration of redox-sensitive radionuclides such as technetium.

The apparent diffusion coefficients of technetium were measured in compacted bentonites (Kunigel VI® and Kunipia F®, JAPAN) in contact with carbon steel and its corrosion products under reducing conditions or without carbon steel under oxidizing conditions for comparison. The apparent diffusion coefficients measured were 10-12 to 10-13 m2/s under oxidizing conditions and 10-12 to 10-13 m2/s under reducing conditions. There were significant effects of redox condition, dry density (0.2 to 2.3 g / cm3) and montmorillonite content (50% for Kunigel VI or 100% for Kunipia F) on the apparent diffusion coefficients. Montmorillonite density could be a good index to explain density dependence of the diffusion coefficients under both reducing and oxidizing conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 909
Copyright
Copyright © Materials Research Society 1997

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References

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