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Radionuclide geochemistry: solubility and thermodynamics in a HLW repository

Fellhauer, David; Gaona, Xavier ORCID iD icon; Altmaier, Marcus; Geckeis, Horst


Deep geological disposal is the internationally favoured option to isolate high-level nuclear waste (HLW) from the biosphere and to minimise the potential radiological risk for future generations. Potentially contacting aqueous solutions such as groundwater may, however, lead to the corrosion of the solid casks containing the nuclear waste, and the formation of aqueous radionuclide systems in the near-field of the emplacement rooms. As dissolved species, radionuclides can in principle further migrate into the far-field and finally reach the biosphere on medium and long timescales. Like all chemical species, the radionuclides are subject to fundamental (geo)chemical laws. Relevant reactions that control retention and release, and hence, the migration behaviour and fate of radionuclides in a repository, are solubility equilibria, formation of soluble complexes, redox reactions, sorption on and incorporation into mineral surfaces, transport phenomena etc. These processes depend directly on the (geo)chemical boundary conditions, and, consequently, can differ greatly for various host rock systems such as clay rock, rock salt, and crystalline rock.
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DOI: 10.5445/IR/1000141147
Veröffentlicht am 14.12.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Vortrag
Publikationsmonat/-jahr 11.2021
Sprache Englisch
Identifikator KITopen-ID: 1000141147
HGF-Programm 32.11.01 (POF IV, LK 01) Nuclear Waste Disposal
Veranstaltung Interdisziplinäres Forschungssymposium für die Sicherheit der nuklearen Entsorgung = Interdisciplinary research symposium On the safety of nuclear disposal practices (safeND 2021), Berlin, Deutschland, 10.11.2021 – 12.11.2021
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