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Redox chemistry, solubility and hydrolysis of uranium in dilute to concentrated salt systems

Cevirim-Papaioannou, Nese

Abstract (englisch):
Uranium is the main element present in spent nuclear fuel and accordingly contributes with the largest mass inventory to the nuclear waste. In spite of uranium being a relatively minor contributor to the overall radiological dose of the waste, it is certainly required to have an accurate knowledge on the solution chemistry and solubility phenomena of this key element. Uranium is also a redox-sensitive actinide, and accordingly its chemical behavior is strongly dependent on the redox boundary conditions of the system. Disposal of spent fuel in deep geological formations such as crystalline/granite, clay and rock salt is the option favored by international consensus. Water intrusion is a possible scenario that needs to be accounted for in the context of the long-term Safety Assessment of these repositories. The composition of the pore water contacting the waste will largely vary depending upon host-rock, backfill and other technical barriers, as well as the waste itself. Although a vast number of studies have previously investigated the solution chemistry of uranium, a number of key uncertainties remain. These affect to redox behavior, solid phases controlling solubility and hydrolysis, especially in the alkaline to hyperalkaline pH conditions of relevance in the context of nuclear waste disposal. ... mehr

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DOI: 10.5445/IR/1000084978
Veröffentlicht am 17.10.2018
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Hochschulschrift
Publikationsjahr 2018
Sprache Englisch
Identifikator urn:nbn:de:swb:90-849788
KITopen-ID: 1000084978
HGF-Programm 32.01.01 (POF III, LK 01) Grundl. Unters. - Geochemie v. Actiniden
Verlag Karlsruher Institut für Technologie (KIT)
Umfang IX, 137 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Chemie und Biowissenschaften (CHEM-BIO)
Institut Institut für Nukleare Entsorgung (INE)
Prüfungsdatum 18.07.2018
Referent/Betreuer Prof. H. Geckeis
Projektinformation EDUKEM (BMWi, EU 6. RP, 02E11334C)
Schlagwörter uranium, redox, hydrolysis. kinetics, uranate, uraniumdioxide, thermodynamics
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