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Abstract

Natural analogue studies have become an essential part of programmes for the deep disposal of radioactive waste. The Palmottu U-Th mineralisation in southwestern Finland has a number of analogous features to aspects being considered in the performance assessment of spent nuclear fuel repositories in crystalline bedrock. Research results from the site are of considerable benefit to countries considering crystalline bedrock as a disposal alternative. The Palmottu natural analogue project consisted of two phases. Phase I (January 1996-May 1997) assessed the processes connected with the flow of groundwater in the bedrock. Phase II (August 1997 -August 1999) identified and quantified the processes related to radionuclide mobilisation and transport. This report presents both the results of Phase II of the project and a synthesis and an evaluation of the results obtained during the whole project, and gives additional recommendations for future work.

The use of hydro-geochemical models in testing the various hydro-geological concepts proved to be a powerful tool in establishing a reliable conceptual understanding of the groundwater system at the site. Geochemical reactions and mixing processes governing the composition and evolution of the groundwater types were identified. The consistency of the different geochemical modelling results gave credibility to the proposed hydrogeochemical processes. An extensive data set of redox measurements in the crystalline bedrock was obtained from ground surface to 400 m depth. The modelling results of the redox controlling processes gave good credibility to the present understanding of redox controlling phenomena in crystalline bedrock regimes. The input from the Palmottu project to support the generally used models for dissolution of spent nuclear fuel is important. Several model-testing exercises were included that provided information of interest to repository performance assessment (PA).

Additional information

Authors: BLOMQVIST R ET AL, GTK (FI);SMELLIE J, Conterra AB (SE);GRUNDFELT B, Goteborg Konsult AB (SE);PEDERSEN K, QuantiSci (ES);BRUNO J ET AL, Ciemat (ES);PEREZ DEL VILLAR, VTT (FI);RASILAINEN K ET AL, UHRAD (FI);SUKSI J, BRGM (FR);CASANOVA J, Enterpris Ltd (UK);READ D, University of Waterloo (CA);FRAPE S,
Bibliographic Reference: EUR 19611 EN (2000), 174 pp, Euro: 29.50
Availability: Available from the European Commission, DG XII Communication Unit, rue de la Loi/Wetstraat 200, B-1049 Bruxelles (BE) Tel: +32-2-2950001 Fax:+32-2-2958220 E-mail:rtd-info@ec.europa.eu
ISBN: ISBN 92-828-0614-6
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