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Fluorine gas is a necessary reactant for enriching uranium fuel.Its unique chemical properties include a single, naturally occurring isotope, and the formation of an easily volatilized uranium compound (UF6), which facilitates the separation of 235U from the more abundant 238U found in natural uranium deposits.Fluorine gas is an important chemical used for removing U and Pu from used fuel and, in particular, for on-line processing of the fuel in a Molten Salt reactor.Elemental fluorine is the strongest oxidizing agent in the periodic table and oxidizesUF4 and PuF4 to their hexavalent state.Fluorine is produced by electrolysis of HF.Generally, the commercial process uses anhydrous HF dissolved in a low-melting temperature molten salt, KF·2HF.The high voltage required to discharge the fluoride to fluorine and the aggressive nature of HF create materials challenges for fluorine electrolyser cells.Amorphous carbon anode are used for large-scale generation fluorine because metals oxidize and dissolve rapidly under fluorine generation conditions.Large commercial fluorine generators are associated with uranium enrichment facilities that generally do not sell fluorine gas.Some half-dozen companies supply fluorine for industrial use, mostly to the electronics industry.Small gas generators are commercially available for on-demand generation of fluorine and can minimize hazards associated with transporting fluorine gas.The development of these small gas generators may be useful for nuclear fuel activities in molten salt purification or used-fuel recycling.Fluorine gas is an important reagent in the nuclear fuel cycle and challenges associated with its generation will be discussed.The introduction of commercial electrolysers into nuclear activities other than enrichment will also be discussed.