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Effects of Smectite Illitization on Transport of Actinides Through Engineered Barriers of HLW Repositories

Published online by Cambridge University Press:  15 February 2011

Joonhong Ahn ,
S. Nagasaki ,
S. Tanaka  and
A. Suzuki
Joonhong Ahn
Affiliation:
Department of Nuclear Engineering, Tokai University, 1117 Kitakaname, Hiratsuka. Kanagawa, 259–12, Japan
S. Nagasaki
Affiliation:
Department of Quantum Engineering and Systems Science, The University of Tokyo, 7–3–1, Hongo, Bunkyo-ku, Tokyo, 113, Japan
S. Tanaka
Affiliation:
Department of Quantum Engineering and Systems Science, The University of Tokyo, 7–3–1, Hongo, Bunkyo-ku, Tokyo, 113, Japan
A. Suzuki
Affiliation:
Department of Quantum Engineering and Systems Science, The University of Tokyo, 7–3–1, Hongo, Bunkyo-ku, Tokyo, 113, Japan
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Abstract

Effect of smectite illitization on mass release rate from the bentonite-filled buffer of the engineered barriers is analyzed based on experimental results of sorption of americium and neptunium onto illite-smectite mixtures, and on mathematical models for smectite illitization by K+ diffusion, water flow through the engineered barriers, waste glass dissolution, and transport of americium and neptunium including solubility sharing with two major americium isotopes and moving boundary effect of the neptunium precipitation region. Numerical results for mass release rates of americium and neptunium as well as time-dependent pore velocity and glass dissolution rate are shown. Illitization effect is negligible with parameter values assumed here.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 231
Copyright
Copyright © Materials Research Society 1995

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References

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