An Innovative Reactive Transport Modeling Approach for the Chemical Evolution of a HLW Cell in the Callovo-Oxfordian Formation

J. Molinero[1], D. García[1], M. Grivé[1], A. Nardi[1]
[1]Amphos 21 Consulting, Barcelona, Spain
Published in 2013

Andra (The French National Radioactive Waste Management Agency) envisages the safe disposal of High-Level Waste (HLW) and Intermediate-Level Long-Lived Waste (IL-LLW) in deep geological storage using a multi-barrier system. To ensure the containment of radioactivity, the principle of storage is based on a clay formation with low permeability, homogeneity and continuity (i.e Callovo-Oxfordian (CallOX) formation), properties that delay and limit the dispersion of the waste. The objectives of this work have been to develop and settle up a geochemical model for quantifying the thermo-hydro-chemical (THC) processes that could be later applied in reactive transport calculations to precisely evaluate the chemical interaction and migration of different radionuclides.