Journal article Open Access

Vaporization behaviour of the Molten Salt Fast Reactor fuel: The LiF-ThF4-UF4 system

Tosolin, A.; O. Beneš; J.-Y. Colle; P. Soucek; L. Luzzi; R.J.M. Konings

A selected composition of the initial fuel of the Molten Salt Fast Reactor (MSFR) is assessed by differential

scanning calorimetry (DSC) for melting point determination and by Knudsen effusion mass spectrometry

(KEMS) for vaporization behaviour. Partial vapour pressures and thermodynamic activities of the MSFR

fuel mixture are discussed indicating departures from ideal behaviour, and further interpreted by phase

equilibria calculations. The boiling point of the mixture is obtained extrapolating vapour pressure

experimental results. New results on the vaporization behaviour of pure uranium tetrafluoride are

presented, together with the ionization potentials of UF4 by electron impact.

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