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Hydraulic and Diffusive Properties of Clay-Based Backfill Material for a Low-and Intermediate-Level Waste Repository

Published online by Cambridge University Press:  15 February 2011

W.J. Cho ,
J.O. Lee ,
P.S. Hahn  and
H.H. Park
W.J. Cho
Affiliation:
Nuclear Environment Management Center Korea Atomic Energy Research Institute, P.O. Box 105, Yoo-Sung, Taejon 305–606, Korea
J.O. Lee
Affiliation:
Nuclear Environment Management Center Korea Atomic Energy Research Institute, P.O. Box 105, Yoo-Sung, Taejon 305–606, Korea
P.S. Hahn
Affiliation:
Nuclear Environment Management Center Korea Atomic Energy Research Institute, P.O. Box 105, Yoo-Sung, Taejon 305–606, Korea
H.H. Park
Affiliation:
Nuclear Environment Management Center Korea Atomic Energy Research Institute, P.O. Box 105, Yoo-Sung, Taejon 305–606, Korea
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Abstract

The results of experimental studies performed to determine the radionuclide diffusion coefficients in a compacted clay and the hydraulic conductivities of clay/crushed granite mixtures with various clay contents are presented. Clay used in the experiments is a natural clay from the southeastern part of Korea, and it contains mainly calcium bentonite. The hydraulic conductivities of clay/crushed granite mixtures decreased with increasing clay content. In case of clay content of 50 wt.%, they maintain the considerably lower values even at the dry density of 1.5 Mg/m3. The diffusion coefficients for 90Sr, 137Cs, 60Co and 125I in water saturated clay at a dry density of 1.4 Mg/m3 were measured at room temperature. The average apparent diffusion coefficients obtained are 4.5 × 10−12 m2/s, 9.0 ×10−13 m2/s, 3.4 × 10−13 m2/s and 6.7 × 10−11 m2/s for 90Sr, 137Cs, 60Co, and 125I, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 299
Copyright
Copyright © Materials Research Society 1995

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References

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