Parametric studies on confinement of radionuclides in the excavated damaged zone due to bentonite type and temperature change |
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| Affiliation: | 1. Department of Physiology and Pharmacology, School of Medicine, Wake Forest University, Winston-Salem, NC 27109, USA;2. Department of Health and Exercise Science, Wake Forest University, Winston-Salem, NC 27109, USA;3. Division of Genetics and Genomics, The Manton Center for Orphan Disease Research, Boston Children''s Hospital, Harvard Medical School, Boston, MA 02115, USA;4. Généthon, 1 bis rue de l''Internationale, 91002 Evry, France;5. Department of Rehabilitation Medicine, School of Medicine, University of Washington, Seattle, WA 98195, USA;6. Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, USA;1. Institut für Mineralogie, GZG, Universität Göttingen, Goldschmidtstr.1, Göttingen, Germany;2. Istituto di Geologia Ambientale e Geoingegneria IGAG-CNR, Via Salaria km 29,300, Rome, Italy;3. Dipartimento di Scienze della Terra, Sapienza-Università di Roma, Piazzale Aldo Moro 5, Rome, Italy;1. Université Nice Sophia Antipolis, Laboratoire des Ecosystèmes Marins Côtiers et réponse aux stress (ECOMERS/EA4228), Facultés des Sciences, Parc Valrose, 06108 Nice Cedex 02, France;2. Université Abdelmalek ESSAADI, Laboratoire Matériaux et Systèmes Interfaciaux LMSI, Faculté Des Sciences, P.B. 2121, 93000 Tetouan, Morocco;3. Université Abdelmalek ESSAADI, Faculté des Sciences Tétouan, Laboratoire Physico-chimie des Matériaux, P.B. 2121, 93000 Tétouan, Morocco |
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| Abstract: | A parametric study is presented in this paper in order to examine the potential of the extruding bentonite into a fracture in the EDZ to confine radionuclides. Radionuclide migration of cesium and neptunium were studied at elevated temperatures and for a sodium- and calcium-type bentonite. Parameter values were obtained based on empirical studies for hydraulic conductivity, molecular diffusion, and sorption. Results indicate extrusion speed is affected by temperature changes. Elevated temperatures also affect radionuclide migration. For Cs, migration is enhanced due to decreasing sorption, while Np migration is inhibited due to increasing sorption. The potential to confine radionuclides is favorable, and the choice of bentonite does not seem to affect radionuclide confinement in the extruding region. |
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| Keywords: | Geologic disposal Performance assessment Temperature effects Parametric studies Bentonite extrusion |
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