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Assessment of Geochemical Containment Properties in the Near-field of a Deep Underground Repository

Published online by Cambridge University Press:  11 February 2011

Delphine Pellegrini  and
Laurent De Windt
Delphine Pellegrini
Affiliation:
Safety Evaluation Department, Institute for Radioprotection and Nuclear Safety, BP17, 92262 Fontenay-aux-Roses, France
Laurent De Windt
Affiliation:
Centre for Geological Computer Sciences, Paris School of Mines, 35 rue Saint-Honoré, 77305 Fontainebleau, France
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Abstract

For safety evaluation of deep repositories, the evolution of chemical containment properties of clayey barriers in spent fuel disposal tunnels are assessed using reactive transport modelling. The disturbances related to cement components are more particularly studied for relevant time scales (100,000 years) and dimensions. Theoretical distribution coefficients (Kd) and maximum concentrations are derived for Cs, Tc and U and their sensitivity to the system evolution estimated. Mineralogical transformations and ion sorption are shown to be interdependent mechanisms controlling the intensity and spatial expansion of the alkaline plume. Simulations for a normal diffusive scenario and an altered one involving an advective flow lead to limited perturbations of the mineralogy and containment properties of the multi-barriers system, but emphasize the possibility of a migration pathway through the excavation damaged zone.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II1.5
Copyright
Copyright © Materials Research Society 2003

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References

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