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Abstract

This is the final report of a joint international research programme on modelling of radionuclide transport in the presence of colloids, aiming to provide a broad theoretical basis and appropriate models as a contribution to safety assessments of deep geological disposal of radioactive waste. Two conceptually different modelling approaches were followed: the macroscopic approach which essentially formulates the problem in terms of lumped parameters of which the values are obtained by numerically simulating transport experiments; the microscopic modelling approach is more phenomenological and provides models for fundamental processes, such as models for radionuclide speciation using extended thermodynamic databases, radionuclide adsorption in terms of surface complexation and cation exchange, colloid-matrix interaction and colloid stability according to the electrostatic theory and kinetic pore-scale phenomena such as thermal motion. The model development was supported by laboratory experiments with pure systems involving artificial colloids (latex) and natural, fractured media with mineral colloids such as silica and clay minerals. Macroscopic models have proved to be practical tools for simulating experiments. Phenomenological models appear useful for gaining insight into fundamental processes and testing and improving the theory.

Additional information

Authors: VAN DER LEE J ET AL, Ecole des Mines de Paris, Fontainebleau (FR);VINSOT A, Intakta, Saint Maur des Fossés (FR);VAN DE WEERD H ET AL, RIVM, Bilthoven (NL);HARMAND B ET AL, LSGC/CNRS, Nancy (FR);HERNÁNDEZ BENÍTEZ A, Ciemat, Madrid (ES)
Bibliographic Reference: EUR 17480 EN (1997) 276pp., FS, ECU 48
Availability: Available from the (2)
ISBN: ISBN 92-827-9626-4
Record Number: 199710451 / Last updated on: 1997-05-09
Category: PUBLICATION
Original language: en
Available languages: en