Long-term geochemical evolution of the near field repository: Insights from reactive transport modelling and experimental evidences

David Arcos (Corresponding Author), Fidel Grandia, Cristina Domènech, Ana M. Fernández, María V. Villar, Arto Muurinen, Torbjörn Carlsson, Patrik Sellin, Pedro Hernán

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Abstract

The KBS-3 underground nuclear waste repository concept designed by the Swedish Nuclear Fuel and Waste Management Co. (SKB) includes a bentonite buffer barrier surrounding the copper canisters and the iron insert where spent nuclear fuel will be placed. Bentonite is also part of the backfill material used to seal the access and deposition tunnels of the repository. The bentonite barrier has three main safety functions: to ensure the physical stability of the canister, to retard the intrusion of groundwater to the canisters, and in case of canister failure, to retard the migration of radionuclides to the geosphere. Laboratory experiments (< 10 years long) have provided evidence of the control exerted by accessory minerals and clay surfaces on the pore water chemistry. The evolution of the pore water chemistry will be a primordial factor on the long-term stability of the bentonite barrier, which is a key issue in the safety assessments of the KBS-3 concept.
Original languageEnglish
Pages (from-to)196-209
JournalJournal of Contaminant Hydrology
Volume102
Issue number3-4
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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Keywords

  • Bentonite
  • High-level nuclear waste repository
  • KBS-3
  • Reactive transport modelling

Cite this

Arcos, D., Grandia, F., Domènech, C., Fernández, A. M., Villar, M. V., Muurinen, A., Carlsson, T., Sellin, P., & Hernán, P. (2008). Long-term geochemical evolution of the near field repository: Insights from reactive transport modelling and experimental evidences. Journal of Contaminant Hydrology, 102(3-4), 196-209. https://doi.org/10.1016/j.jconhyd.2008.09.021