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Overview of ¹⁴C release from irradiated zircaloys in geological disposal conditions

Necib, S; Bucur, C; Caes, S; Cochin, F; Cvetković, B Z; Fulger, M; Gras, J M; Herm, M; Kasprzak, L; Legand, S; Metz, V; Perrin, S; Sakuragi, T; Suzuki-Muresan, T

Abstract:
Carbon-14 (radiocarbon, 14C) is a long-lived radionuclide (5730 yr) of interest regarding the safety for the management of intermediate level wastes (ILW). The present study gives an overview of the release of 14C from irradiated Zircaloy cladding in alkaline media. 14C is found either in the alloy part of Zircaloy cladding due to the neutron activation of 14N impurities by 14N(n,p)14C reaction, or in the oxide layer (ZrO2) formed at the metal surface by the neutron activation of 17O from UO2 or (U-Pu)O2 fuel and water from the primary circuit in the reactor by 17O(n,α)14C reaction. Various irradiated and unirradiated Zircaloys have been studied. The total 14C inventory has been determined both experimentally and by calculations. The results seem to be in good agreement. Leaching experiments were conducted in alkaline media for several time durations. 14C was mainly released as carboxylic acids. Further, corrosion measurements were performed by using both hydrogen measurements and electrochemical measurements. The corrosion rate (CR) ranges from a few nm/yr to 100 nm/yr depending on the surface conditions and the method used for mea ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000091417
Veröffentlicht am 21.02.2019
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 0033-8222, 1945-5755
urn:nbn:de:swb:90-914170
KITopen-ID: 1000091417
HGF-Programm 32.01.02 (POF III, LK 01)
Erschienen in Radiocarbon
Band 60
Heft 6
Seiten 1757–1771
Nachgewiesen in Web of Science
Scopus
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