Hydrogen permeability through a mixed molten salt of LiF, NaF and KF (Flinak) as a heat-transfer fluid

Tritium Formation and Mitigation in High Temperature Reactors

“…This gas may pick up some of the tritium in the salt through diffusion; the amount that diffuses depends on the form of tritium (TF is more effectively removed). 34 Subsequent to diffusion into the bulk gas, tritium may be removed from the gas; 1 a palladium membrane has been suggested for this application. 10 Other removal strategies have also been evaluated, including thermal diffusion and cryogenic distillation.…”

Tritium Formation and Mitigation in High-Temperature Reactors

“…Higher partial pressures result in greater HT formation, while lower partial pressures favor formation of the corrosive but less permeable TF. 8,33 The permeation of tritium through FLiBe is thought to be limited by the rate of transport of T + ions through the molten salt, 34 since diffusion through the salt is independent of hydrogen activity or partial pressure. 33 At 873 K (600ιC) the overall mass transfer coefficient was measured by Suzuki et al 33 to be between 7.5*10 -6 and 1.1*10 -5 (m s -1 ) for two selected rates of purge gas bubbling.…”

“…35,36 Structural materials candidates for MSRs must meet the same thermal requirements as materials for HTGRs, but must also resist corrosion by fluoride salts. Hastelloy N and Incoloy 800H are good candidates for these reactors because of nickel alloys' resistance to deformation at high temperatures 2,34 and low chromium nickel alloys' superior resistance to corrosion in pure fluoride salts.…”

“…In general, a helium or argon gas is used to cover the reactive salt to prevent corrosion at the salt-gas interface on the metal of construction. This gas may pick up some of the tritium in the salt through diffusion; the amount that diffuses depends on the form of tritium 34 . Subsequent to diffusion into the bulk gas, tritium may be removed from the gas; 1 a palladium membrane has been suggested for this application.…”

Hydrogen transport in molten salt Flinak measured by solid electrolyte sensors with Pd electrode

“…The diffusion coefficient and solubility of hydrogen (isotope) in the molten salts were reported in Refs. [6][7][8]. Fukada and Morisaki [6] and Katsuta and Furukawa [7] reported the solubility of hydrogen in Flinak around the temperature of 600 and 500 • C, respectively.…”