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SUPERFACT: A Model Fuel for Studying the Evolution of the Microstructure of Spent Nuclear Fuel during Storage/Disposal

Wiss, Thierry; Dieste, Oliver; De Bona, Emanuele; Benedetti, Alessandro; Rondinella, Vincenzo; Konings, Rudy


The transmutation of minor actinides (in particular, Np and Am), which are among the main contributors to spent fuel α-radiotoxicity, was studied in the SUPERFACT irradiation. Several types of transmutation UO$_{2}$-based fuels were produced, differing by their minor actinide content ($^{241}$Am, $^{237}$Np, Pu), and irradiated in the Phénix fast reactor. Due to the high content in rather short-lived alpha-decaying actinides, both the archive, but also the irradiated fuels, cumulated an alpha dose during a laboratory time scale, which is comparable to that of standard LWR fuels during centuries/millenaries of storage. Transmission Electron Microscopy was performed to assess the evolution of the microstructure of the SUPERFACT archive and irradiated fuel. This was compared to conventional irradiated spent fuel (i.e., after years of storage) and to other $^{238}$Pu-doped UO$_{2}$ for which the equivalent storage time would span over centuries. It could be shown that the microstructure of these fluorites does not degrade significantly from low to very high alpha-damage doses, and that helium bubbles precipitate.

Verlagsausgabe §
DOI: 10.5445/IR/1000141359
Veröffentlicht am 18.12.2021
DOI: 10.3390/ma14216538
Zitationen: 3
Web of Science
Zitationen: 3
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000141359
Erschienen in Materials
Verlag MDPI
Band 14
Heft 21
Seiten 6538
Vorab online veröffentlicht am 30.10.2021
Nachgewiesen in Web of Science
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