1. University of Tokyo, Institute for Nuclear Study Midori-cho, 3-2-1, Tanashi, Tokyo, Japan
2. Hitachi Engineering Company Ltd. Saiwai-cho, 3-2-1, Hitachi, Ibaraki, Japan
3. Kyoto University, Department of Nuclear Engineering Yoshida-Honmachi, Sakyo, Kyoto, Japan
4. Osaka University, Department of Nuclear Engineering Yomadaoka 2-1, Suit a, Osaka, Japan