| Issue |
E3S Web Conf.
Volume 98, 2019
16th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|
|
|---|---|---|
| Article Number | 10005 | |
| Number of page(s) | 5 | |
| Section | Disposal of Radioactive Waste: Geological, Hydrogeological and Geochemical Aspects | |
| DOI | https://doi.org/10.1051/e3sconf/20199810005 | |
| Published online | 07 June 2019 | |
Reactive transport calculations to evaluate sulphide fluxes in the near-field of a SF/HLW repository
1
Institute of Geological Sciences, University of Bern, Baltzerstrasse 3, 3012 Bern, Switzerland
2
NAGRA, Hardstrasse 73, 5430 Wettingen, Switzerland
* Corresponding author: marek.pekala@geo.unibe.ch
† currently at Arcadis Schweiz AG
Radioactive waste is planned to be disposed in a deep geological repository in the Opalinus Clay (OPA) rock formation in Switzerland. Cu coating of the steel disposal canister is considered as potential a measure to ensure complete waste containment of spent nuclear fuel (SF) and vitrified high-level waste (HLW) or a period of 100,000 years. Sulphide is a potential corroding agent to Cu under reducing redox conditions. Background dissolved sulphide concentrations in pristine OPA are low, likely controlled by equilibrium with pyrite. At such concentrations, sulphide-assisted corrosion of Cu would be negligible. However, the possibility exists that sulphate reducing bacteria (SRB) might thrive at discrete locations of the repository’s near-field. The activity of SRB might then lead to significantly higher dissolved sulphide concentrations. The objective of this work is to employ reactive transport calculations to evaluate sulphide fluxes in the near-field of the SF/HLW repository in the OPA. Cu canister corrosion due to sulphide fluxes is also simplistically evaluated.
© The Authors, published by EDP Sciences, 2019
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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