Pb-17Li will be a coolant in designing fusion-fission hybrid reactor, as well as a tritium producer. The liquid metal with tritium has high permeability and corrosiveness, so the inner surface of the steel coolant piping should be coated with a tritium pe Pb-17Li will be a coolant in designing fusion-fission hybrid reactor, as well as a tritium producer. The liquid metal with tritium has high permeability and corrosiveness, so the inner surface of the steel coolant piping should be coated with a tritium pe