Hostname: page-component-586b7cd67f-rcrh6 Total loading time: 0 Render date: 2024-11-25T17:54:24.318Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Serres, C., Claisse, A. and Besnus, F., “Evaluating effect of design options on flow and transport”, Proc. of the 9th IHLRWM conf., Las Vegas, April 29 – May 3 (2001).Google Scholar
2. De Windt, L., Pellegrini, D. and Van der Lee, J., “Reactive transport modeling of interaction processes between cement and claystone”, EUROSAFE Proc., Paris (2001).Google Scholar
3. De Windt, L., Cabrera, J. and Boisson, J.-Y., “Radioactive Waste Containment in Indurated Claystones: Comparison between the Chemical Containment Properties of Matrix and Fractures”, Geological Society of London 157, 167–181 (1999).Google Scholar
4. Bossart, P., Meier, P.M., Moeri, A., Trick, T. and Mayor, J.C., “Geological and hydraulic characterisation of the excavation disturbed zone in the Opalinus Clay of the Mont Terri Rock Laboratory, Eng. Geol. 2040, 19–38 (2002).Google Scholar
5. van der Lee, J., De Windt, L., Lagneau, V. and Goblet, P., “Module-oriented modeling of reactive transport with HYTEC”, Comp. Geosc 29, 265–275 (2003).Google Scholar
6. De Windt, L., van der Lee, J. and Pellegrini, D., “Reactive transport modeling of pH buffering in cement - clay systems”, Water Rock Inter. Proc. (Italy), Balkema, Ed., 1315–1318 (2001).Google Scholar
7. Bradbury, M.H. and Baeyens, B., “Far-field sorption data bases for performance assessment of a L/ILW repository in a disturbed/altered Palfris marl host rock”, PSI TR 97–16 (1997).Google Scholar