1. Central Research Institute of Electric Power Industry Nuclear Energy Systems Department, 2-11-1, Iwado Kita, Komae-shi Tokyo 201-8511, Japan
2. Mitsubishi Research Institute, Inc. 3-6, Otemachi 2-chome, Chiyoda-ku, Tokyo 100-8141, Japan
3. Kyoto University, Research Reactor Institute Kumatori-cho, Sennan-gun, Osaka 590-20494, Japan
4. Japan Atomic Energy Research Institute 2-4, Shirakata-shirane, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan