Evolution of the Geochemical Background of an HLW Cell in the Callovo-Oxfordian Formation

O. Silva[1], M. Pekala[1], D. Garcia[1], J. Molinero[1], A. Nardi[1], M. Grive[1], B. Cochepin[2]
[1]Amphos 21 Consulting, Barcelona, Spain
[2]Agence Nationale pour la Gestion des Dechéts Radioactifs, Châtenay-Malabry Cedex, France
Published in 2014

The French National Waste Management Agency (Andra) envisages the safe disposal of High-Level Waste Intermediate-Level Long-Lived Waste through deep geological storage (multibarrier). Waste storage is based on the Callovo-Oxfordian formation (CallOx).

It has been updated a reactive transport model accounting for the chemical and thermal evolution of a HLW cell. Improvements are a better implementation of surface complexation and ion exchange, using iCP (Nardi et al., 2014), a high performance computing framework based on coupling COMSOL Multiphysics® and PHREEQC. The model is developed for the Head configuration of the HLW cell considering the last design of the HLW cell and materials parameters provided by Andra. Reactive transport calculations focused on the “background” geochemical evolution for a period of 100,000 years.