Diffusion of HTO, Br−, I−, Cs+, 85Sr2+ and 60Co2+ in a clay formation: Results and modelling from an in situ experiment in Opalinus Clay

Wersin, Paul; Soler, Josep M.; Loon, Luc R. Van; Eikenberg, J.; Baeyens, Bart; Grolimund, Daniel; Gimmi, Thomas; Dewonck, S.

doi:10.1016/j.apgeochem.2007.11.004

Cited by 82 publications

(74 citation statements)

References 10 publications

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“…. In DI-A2, some evidence was found related to erosion of the borehole wall in the upper and lower parts of the borehole that could also result in the observed differences in the diffusion profiles (Wersin et al 2008).…”

Section: Water Tracer Diffusionmentioning

confidence: 99%

“…The two sets of independent data (temporal evolution in the borehole and spatial distribution profiles in the rock) allow determination through modelling of (a) a transport parameter (effective diffusion coefficient) and (b) an accessible porosity (conservative tracers) or sorption parameter (sorbing tracers). Figure 2 shows results from the DI-A2 experiment (Wersin et al 2008).…”

Section: Concept and Modelling Of The Diffusion Experimentsmentioning

confidence: 99%

“…In the DI-A2 and DR experiments, the depletion of radiotracers in the circulating fluid was also measured in situ using a solid-state intrinsic high-purity Ge-detector with an electric cryo-cooling system (Wersin et al 2008) Eu 3? .…”

Section: In-situ Analyses Of Radiotracers In Reservoir Tanksmentioning

confidence: 99%

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Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

et al. 2017

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Transport and retardation parameters of radionuclides, which are needed to perform a safety analysis for a deep geological repository for radioactive waste in a compacted claystone such as Opalinus Clay, must be based on a detailed understanding of the mobility of nuclides at different spatial scales (laboratory, field, geological unit). Thanks to steadily improving experimental designs, similar tracer compositions in different experiments and complementary small laboratory-scale diffusion tests, a unique and large database could be compiled. This paper presents the main findings of 20 years of diffusion and retention experiments at the Mont Terri rock laboratory and their impact on safety analysis.

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Section: Water Tracer Diffusionmentioning

confidence: 99%

Section: Concept and Modelling Of The Diffusion Experimentsmentioning

confidence: 99%

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Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

et al. 2017

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“…In situ diffusion coefficients for HTO, 125 I -, 22 Na + and some other species were measured during field experiments in the Mont Terri Rock Laboratory (Van Loon et al 2004;Wersin et al 2006Wersin et al , 2008Soler et al 2008Soler et al , 2013; these mostly relate to transport parallel to bedding. In the experiments, which extended over one to four years, diffusion distances of up to 30 cm (depending on species) were reached, i. e. around one order of magnitude more than in the laboratory experiments.…”

Section: In Comparisonmentioning

confidence: 99%

Safety-relevant hydrogeological properties of the claystone barrier of a Swiss radioactive waste repository: An evaluation using multiple lines of evidence

Gautschi

2017

Grundwasser

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In Switzerland, the Opalinus Clay -a Jurassic (Aalenian) claystone formation -has been proposed as the first-priority host rock for a deep geological repository for both low-and intermediate-level and high-level radioactive wastes. An extensive site and host rock investigation programme has been carried out during the past 30 years in Northern Switzerland, comprising extensive 2D and 3D seismic surveys, a series of deep boreholes within and around potential geological siting regions, experiments in the international Mont Terri Rock Laboratory, compilations of data from Opalinus Clay in railway and motorway tunnels and comparisons with similar rocks.The hydrogeological properties of the Opalinus Clay that are relevant from the viewpoint of long-term safety are described and illustrated. The main conclusions are supported by multiple lines of evidence, demonstrating consistency of conclusions based on hydraulic properties, porewater chemistry, distribution of natural tracers across the Opalinus Clay as well as small-and large-scale diffusion models and the derived conceptual understanding of solute transport.

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“…Palut et al 2003;Van Loon et al 2004b;Wersin et al 2004;Yllera et al Editorial handling: P. Bossart and A. G. Milnes. This is paper #20 of the Mont Terri Special Issue of the Swiss Journal of Geosciences (see Bossart et al 2017, Wersin et al 2008;Gimmi et al 2014). A main interest was the comparison of results with those from laboratory experiments performed on small samples (in the order of a few cm) of the same material.…”

Section: Introductionmentioning

confidence: 99%

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

Leupin

Loon

Gimmi

et al. 2017

Mont Terri Rock Laboratory, 20 Years

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Diffusion of HTO, Br−, I−, Cs+, 85Sr2+ and 60Co2+ in a clay formation: Results and modelling from an in situ experiment in Opalinus Clay

Cited by 82 publications

References 10 publications

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

Safety-relevant hydrogeological properties of the claystone barrier of a Swiss radioactive waste repository: An evaluation using multiple lines of evidence

Exploring diffusion and sorption processes at the Mont Terri rock laboratory (Switzerland): lessons learned from 20 years of field research

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