1. Osaka University, Department of Nuclear Engineering Yamada-oka 2-1, Suita, Osaka, Japan
2. Nippon Atomic Industry Group Company, Ltd. Ukishima-cho 4-1, Kawasaki-ku, Kawasaki, Kanagawa, Japan
3. Power Reactor and Nuclear Fuel Development Corporation 9-13, 1-Chome, Akasaka, Minato-ku, Tokyo, Japan