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| Hauptseite > Publikationsdatenbank > DR-D diffusion experiment in the sandy facies of Opalinus Clay: preparatory rock characterization, installation and diffusion tests |
| Hauptseite > Publikationsdatenbank > DR-D diffusion experiment in the sandy facies of Opalinus Clay: preparatory rock characterization, installation and diffusion tests |
| Contribution to a conference proceedings | FZJ-2026-02793 |
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2026
Federal Office of Topography swisstopo
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Please use a persistent id in citations: doi:10.60695/SWISSTOPO.MTTM43.505.2026
Abstract: Host rock heterogeneities may represent a source of uncertainty for the long-term safety of the deep geological disposal of high-level radioactive waste (HLW) in argillaceous formations if they are not captured adequately and at the relevant scale in the derivation of transport parameters. The DR-D experiment contributes to assessing the extent to which rock heterogeneity affects radionuclide diffusion at the meter scale (i.e., around a 1 m diffusion interval). This study focuses on the sandy facies of Opalinus Clay (SF-OPA) from the Mont Terri rock laboratory (Switzerland), which exhibits a significantly higher degree of heterogeneity compared to the more commonly investigated shaly facies. In that respect, SF-OPA offers insight into heterogeneous argillaceous formations that might be encountered in different national contexts for instance in Germany or Belgium, where a range of clay formations are being considered. The closely related DR-C experiment addresses the impact of a temperature gradient on radionu-clide diffusion via two diffusion experiments conducted at ambient temperature and at 80 °C. While this paper provides an overview of laboratory and in-situ activities supporting both DR-D and DR-C, the focus is placed on DR-D, as DR-C is described in a separate contribution (Pochet et al. 2026).
Keyword(s): 43rd Mont Terri Technical Meeting. 30th Anniversary
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