Investigation of ionic local structure in molten salt fast reactor LiF-ThF4-UF4 fuel by EXAFS experiments and molecular dynamics simulations

Catherine Bessada (1, 2) , Didier Zanghi (1, 2) , Mathieu Salanne (3) , Ana Gil-Martin (1, 2) , Mathieu Gibilaro (4) , Pierre Chamelot (4) , Laurent Massot (4) , Atsushi Nezu (5) , Haruaki Matsuura (6)

1 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
2 UO - Université d'Orléans
3 PHENIX - PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX
4 LGC - Laboratoire de Génie Chimique
5 RLNR - Research Laboratory for Nuclear Reactors
6 Tokyo City University

This article focuses on the speciation of molten fluoride mixtures based on ThF 4 and UF 4 actinides used in molten salt reactors. The local structure of molten AF-MF 4 systems (A=Li + , Na + , K + ; M= Th 4+ , U 4+) was studied in situ by combining measurements by high temperature X-ray absorption spectroscopy and molecular dynamics simulations. In the molten state, 20°C

Mots clés: EXAFS; Molecular dynamics; high temperature; molten salt reactors; speciation; actinides

Domaines: Matériaux

Catherine Bessada, Didier Zanghi, Mathieu Salanne, Ana Gil-Martin, Mathieu Gibilaro, et al.. Investigation of ionic local structure in molten salt fast reactor LiF-ThF4-UF4 fuel by EXAFS experiments and molecular dynamics simulations. Journal of Molecular Liquids, 2020, 307, pp.112927. ⟨10.1016/j.molliq.2020.112927⟩. ⟨hal-03014065⟩