18 Oct 2023
| 18 Oct 2023
Uranium migration lengths in Opalinus Clay depend on geochemical gradients, radionuclide source term concentration and pore water composition
Theresa Hennig
CORRESPONDING AUTHOR
GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Telegrafenberg, 14473 Potsdam, Germany
Michael Kühn
GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Telegrafenberg, 14473 Potsdam, Germany
University of Potsdam, Institute of Geosciences, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
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Migration of uranium in the potential host rock Opalinus Clay is used as an example to demonstrate the extent to which simulated migration lengths can vary for a million years, depending on the model concept and on the underlying data and parameters. To reduce the uncertainty in this context, the calcite carbonate ion and the hydrogeological system at a potential disposal site need to be known, whereas the quantity of clay minerals plays a subordinate role, as long as it is enough.
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Cited articles
Aubourg, C., Kars, M., Pozzi, J. P., Mazurek, M., and Grauby, O.: A magnetic geothermometer in moderately buried shales, Minerals, 11, 957, https://doi.org/10.3390/min11090957, 2021. a
Davies, C. W. and Shedlovsky, T.: Ion Association, J. Electrochem. Soc., 111, 85C, https://doi.org/10.1149/1.2426129, 1964. a
Ewing, R. C.: Long-term storage of spent nuclear fuel, Nat. Mater., 14, 252–257, https://doi.org/10.1038/nmat4226, 2015. a
Grenthe, I., Gaona, X., Plyasunov, A. V., Rao, L., Runde, W., Grambow, B., Konings, R. J. M., Smith, A. L., and Moore, E. E.: Second update on the chemical thermodynamics of uranium, neptunium, plutonium, americium and technecium, Chemical Thermodynamics no. 14, OECD Nuclear Energy Agency, Boulogne-Billancourt, France, https://www.oecd-nea.org (last access: 19 September 2023), 2020. a
Hennig, T. and Kühn, M.: Surrogate model for multi-component diffusion of uranium through Opalinus Clay on the host rock scale, Appl. Sci., 11, 786, https://doi.org/10.3390/app11020786, 2021a. a
IAEA: The safety case and safety assessment for the disposal of radioactive waste, Safety Standards Series – Specific Safety Guide no. SSG-23, International Atomic Energy Agency, Vienna, Austria, https://www.iaea.org/publications/8790/the-safety-case-and-safety-assessment-for-the-disposal-of-radioactive-waste (last access: 12 October 2023), 2012. a
Joseph, C., Schmeide, K., Sachs, S., Brendler, V., Geipel, G., and Bernhard, G.: Sorption of uranium(VI) onto Opalinus Clay in the absence and presence of humic acid in Opalinus Clay pore water, Chem. Geol., 284, 240–250, https://doi.org/10.1016/j.chemgeo.2011.03.001, 2011. a, b
Joseph, C., Stockmann, M., Schmeide, K., Sachs, S., Brendler, V., and Bernhard, G.: Sorption of U(VI) onto Opalinus Clay: effects of pH and humic acid, Appl. Geochem., 36, 104–117, https://doi.org/10.1016/j.apgeochem.2013.06.016, 2013a. a
Lerouge, C., Grangeon, S., Claret, F., Gaucher, E., Blanc, P., Guerrot, C., Flehoc, C., Wille, G., and Mazurek, M.: Mineralogical and isotopic record of diagenesis from the Opalinus Clay formation at Benken, Switzerland: implications for the modeling of porewater chemistry in a clay formation, Clay. Clay Miner., 62, 286–312, https://doi.org/10.1346/CCMN.2014.0620404, 2014. a, b
Lerouge, C., Maubec, N., Wille, G., and Flehoc, C.: Geochemical Data (GD) experiment: analysis of carbonate fraction in Opalinus Clay, Technical Note TN 2014-92, Mont Terri Project, St. Ursanne, Switzerland, 2015. a
Marques Fernandes, M., Vér, N., and Baeyens, B.: Predicting the uptake of Cs, Co, Ni, Eu, Th and U on argillaceous rocks using sorption models for illite, Appl. Geochem., 59, 189–199, https://doi.org/10.1016/j.apgeochem.2015.05.006, 2015. a
Mazurek, M., Alt-Epping, P., Bath, A., Gimmi, T., Waber, H. N., Buschaert, S., De Cannière, P., De Craen, M., Gautschi, A., Savoye, S., Vinsot, A., Wemaere, I., and Wouters, L.: Natural tracer profiles across argillaceous formations, Appl. Geochem., 26, 1035–1064, https://doi.org/10.1016/j.apgeochem.2011.03.124, 2011. a, b, c
Mazurek, M., Oyama, T., Wersin, P., and Alt-Epping, P.: Pore-water squeezing from indurated shales, Chem. Geol., 400, 106–121, https://doi.org/10.1016/j.chemgeo.2015.02.008, 2015. a
Montavon, G., Ribet, S., Hassan Loni, Y., Maia, F., Bailly, C., David, K., Lerouge, C., Madé, B., Robinet, J. C., and Grambow, B.: Uranium retention in a Callovo-Oxfordian clay rock formation: from laboratory-based models to in natura conditions, Chemosphere, 299, 134307, https://doi.org/10.1016/j.chemosphere.2022.134307, 2022. a
Nagra: Project Opalinus Clay – Safety Report. Demonstration of disposal feasibility for spent fuel, vitrified high-level waste and long-lived intermediate-level waste (Entsorgungsnachweis), Nagra Technical Report NTB 02-05, Nagra, Wettingen, Switzerland, https://www.nagra.ch/en/download-centre (last access: 12 October 2023), 2002. a, b
Nagra: Entsorgungsprogramm 2021, Nagra Technical Report NTB 21-01, Nagra, Wettingen, Switzerland, http://www.nagra.ch/downloads (last access: 18 September 2023), 2021. a
Noseck, U., Brendler, V., Britz, S., Stockmann, M., Fricke, J., Richter, C., Lampe, M., Gehrke, A., and Flügge, J.: Smart Kd-concept for long-term safety assessments: extension towards more complex applications, Tech. Rep. GRS-500, GRS and HZDR, Cologne and Dresden, Germany, ISBN 978-3-946607-85-4, 2018. a
Parkhurst, D. L. and Appelo, C. A. J.: Description of input and examples for PHREEQC Version 3 – A computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations, in: Book 6 – Modelling techniques, Chap. A43, p. 497, https://pubs.usgs.gov/tm/06/a43/pdf/tm6-A43.pdf (last access: 12 October 2023), 2013. a
Pearson, F. J., Arcos, D., Bath, A., Boisson, J.-Y., Fernández, A. M., Gäbler, H. E., Gaucher, E. C., Gautschi, A., Griffault, L., Hernán, P., and Waber, H. N.: Mont Terri Project – Geochemistry of water in the Opalinus Clay formation at the Mont Terri rock laboratory, Reports of the FOWG, Geology Series no. 5, Federal Office for Water and Geology (FOWG), Bern, Switzerland, ISBN 3-906723-59-3, 2003. a, b, c, d
Pearson, F. J., Tournassat, C., and Gaucher, E. C.: Biogeochemical processes in a clay formation in-situ experiment: part E – Equilibrium controls on chemistry of pore water from the Opalinus Clay, Mont Terri underground research laboratory, Switzerland, Appl. Geochem., 26, 990–1008, https://doi.org/10.1016/j.apgeochem.2011.03.008, 2011. a
Pekala, M., Wersin, P., Rufer, D., and Curti, E.: Geochemical Data (GD) experiment: mineralogy of carbonate and sulphate minerals in the Opalinus Clay and adjacent formations, Technical Report TR 2018-03, Mont Terri Project, 2019. a
Stockmann, M., Schikora, J., Becker, D. A., Flügge, J., Noseck, U., and Brendler, V.: Smart Kd-values, their uncertainties and sensitivities – Applying a new approach for realistic distribution coefficients in geochemical modelling of complex systems, Chemosphere, 187, 277–285, https://doi.org/10.1016/j.chemosphere.2017.08.115, 2017. a, b
Thoenen, T., Hummel, W., Berner, U., and Curti, E.: The PSI/Nagra chemical thermodynamic database 12/07, PSI Report no. 14-04, Paul Scherrer Institute, Villigen, Switzerland, https://www.psi.ch/en/les/database (last access: 12 October 2023), 2014. a
USGS: PHREEQC Version 3, Software release 3.5.0, https://www.usgs.gov/software/phreeqc-version-3 (last access: 4 September 2019), 2021. a
Van Loon, L. R., Soler, J. M., Müller, W., and Bradbury, M. H.: Anisotropic diffusion in layered argillaceous rocks: a case study with Opalinus Clay, Environ. Sci. Technol., 38, 5721–5728, https://doi.org/10.1021/es049937g, 2004. a, b
Van Loon, L. R., Müller, W., and Iijima, K.: Activation energies of the self-diffusion of HTO, 22Na+ and 36Cl− in a highly compacted argillaceous rock (Opalinus Clay), Appl. Geochem., 20, 961–972, https://doi.org/10.1016/j.apgeochem.2004.10.007, 2005. a
Wersin, P., Mazurek, M., Waber, H. N., Mäder, U. K., Gimmi, T., Rufer, D., and de Haller, A.: Rock and porewater characterisation on drillcores from the Schlattingen borehole, Nagra Arbeitsbericht NAB 12-54, Nagra, Wettingen, Switzerland, https://nagra.ch/downloads/ (last access: 24 May 2023), 2013. a
Wersin, P., Mazurek, M., and Gimmi, T.: Pore water chemistry of Opalinus Clay revisited: findings from 25 years of data collection at the Mont Terri Rock Laboratory, Appl. Geochem., 138, 105234, https://doi.org/10.1016/j.apgeochem.2022.105234, 2022. a
Short summary
Uranium migration for a close to real case situation is quantified with reactive transport simulations using input data from the deep geothermal borehole Schlattingen, which is near the targeted area in Switzerland, and including the effect of the multi-barrier system on the source term. The hydrogeological system must always be considered in safety assessments since adjacent aquifers have a major impact on the pore water geochemistry, and hence sorption processes.
Uranium migration for a close to real case situation is quantified with reactive transport...
