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Modeling of Geochemical Compatibility of Near Field Materials in Terms of Radionuclide Retention Properties

Published online by Cambridge University Press:  20 August 2019

P. L. Lucille ,
A Burnol  and
Ph. Ollar
P. L. Lucille
Affiliation:
Electricité de France, Research and Development Division
A Burnol
Affiliation:
Laboratoire National d'Hydraulique, Chatou, France
Ph. Ollar
Affiliation:
Département Etudes de Matériaux, Moret sur Loing, France
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Abstract

The containment of radionuclides over very long periods of time is based on the interposition of a multi-barrier system between the waste and the biosphere. A performance allocation study is usually conducted for each barrier. Each barrier is then designed, in terms of geometry and composition, to cope with the performance it has been allocated. However geochemical interactions will occur between the different barriers. An alkaline plume will be generated by cement materials, a redox front will be generated by container corrosion and geochemical gradients will be generated by the dissolution of artificial barriers by natural groundwater. Radionuclide retention mechanisms are strongly pH and Eh dependent, therefore the impact of these geochemical transients on retention must be quantitatively evaluated to check the performance of each barrier for realistic in-situ situations. To assess this impact, two types of engineered barriers (clay and cement) for a spent fuel repository are simulated with a coupled hydrogeochemical model. Comparisons between hydraulic heterogeneous (fractured) and simple homogeneous systems are also carried out in terms of waste dissolution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 1075
Copyright
Copyright © Materials Research Society 1999

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References

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