1. Toshiba Corporation, Power and Industrial Systems Research and Development Center Tsurumi-ku, Yokohama-shi 230-0045, Japan
2. Toshiba Corporation, Power and Industrial Systems Research and Development Center Kawasaki-ku, Kawasaki-shi 210-0862, Japan
3. Toshiba Corporation, Nuclear Energy Division, Isogo-ku Yokohama-shi 235-8523, Japan
4. Central Research Institute of Electric Power Industry, Yokosuka-shi Kanagawa-ken 240-0196, Japan
5. University of Tokyo, Nuclear Engineering Research Laboratory, Tokai-mura Ibaraki-ken 113-8656, Japan