1. Graduate School of Energy Science, Kyoto University; and Mitsubishi Heavy Industries, LTD., 16-5, Konan 2-Chome, Minato-ku, Tokyo 108-8215, Japan
2. School of Nuclear Engineering, Purdue University, Nuclear Engineering Building, Room 132C, 400 Central Drive, West Lafayette, IN 47907-2017
3. Research Reactor Institute, Kyoto University, Kumatori, Sennan, Osaka 590-0494, Japan; and Institute of Nuclear Safety System, Incorporated, 64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205 Japan