Nuclear reactor technologies being developed for Generation IV reactors promise significant improvements in economics, safety, reliability and sustainability over present technologies by proper choice of cladding and structural material for the nuclear reactor. Studies to develop optimum combination of properties for steels intended for use as wrappers indicated that 9-12Cr type ferritic steels presented superior high temperature strength at temperatures below 873 K and excellent dimensional stability at high irradiation doses. Increasing the operating temperature by Oxide Dispersion...