The development of functional layers such as a tritium permeation barrier and an anti-corrosion layer is
the essential technology for the development of a molten salt type self cooled fusion blanket. In the present
study, the characteristics of a nitriding treatment on a reduced activation ferritic steel, JLF-1 (Fe-9Cr-2W-0.1C)
as the functional layer were investigated. The steel surface was nitrided by an ion nitriding treatment or a radical
nitriding treatment. The nitridation characteristic of the steel surface was made clear based on the thermodynamic
stability. The thermal diffusivity, the hydrogen permeability and the chemical stability in the molten salt Flinak
were investigated. The results indicated that the nitriding treatment can improve the compatibility in the Flinak
without the decrease of the thermal diffusivity, though there was little improvement as the hydrogen permeation
barrier.
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