1. University of Tokyo Research Center for Nuclear Science and Technology Yayoi 2-11-16, Bunkyo-ku, Tokyo, Japan
2. University of Tokyo Department of Nuclear Engineering, Faculty of Engineering, Yayoi 2-11-16, Bunkyo-ku, Tokyo, Japan
3. Power Reactor and Nuclear Fuel Development Corporation, Akasaka 1-9-13, Minato-ku, Tokyo, Japan
4. Mitsubishi Research Institute, Inc., Time-Life Building, Ohtemati 2-3-6, Chiyoda-ku, Tokyo, Japan