Modelling the interaction of the alkaline plume with Boom Clay at different scales

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Abstract

The supercontainer in the concept of the Belgian geological disposal of high level radioactive waste produces a high pH plume in the Boom Clay. This studies assess both the extend of the alkaline plume perturbation and the effect of the Boom Clay pore water on the geochemical concrete properties. At the laboratory scale, long-term column experiments were modeled using a reactive transport model incorporating cation exchange reactions and surface complexation. Long term modeling at the scale of the geological disposal facility was also performed with the reactive transport model PHREEQC. Parameter and model sensitivity were tested with respect to the spatial extend of the alkaline perturbation. The disturbed zone is limited up to 2 m after 25000 y.

Details

Original languageEnglish
Title of host publicationCementitious materials in safety cases for geological repositories for radioactive waste: role, evolution and interaction
Place of PublicationParis, France
Pages241-244
Publication statusPublished - Mar 2012
EventCementitious Materials in Safety Cases for Geological Repositories for Radioactive Waste: Role, Evolution and Interactions - NEA IGSC, Brussels, Belgium
Duration: 17 Nov 200920 Nov 2009

Publication series

NameNEA/RWM report
NumberNEA/RWM/R(2012)3

Conference

ConferenceCementitious Materials in Safety Cases for Geological Repositories for Radioactive Waste: Role, Evolution and Interactions
Country/TerritoryBelgium
CityBrussels
Period2009-11-172009-11-20

Keywords

  • geological disposal radioactive waste, alkaline plume perturbation, reactive transport modelling

ID: 234594