1. Central Research Institute of the Electric Power Industry 2-11-1 Iwadokita Komae-shi, Tokyo 201, Japan
2. Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken 319-11, Japan
3. Toshiba Corporation, Nuclear Energy Division 8 Shinsugita-cho, Isogo-ku, Yokohama-shi 235, Japan
4. Hitachi, Ltd., Energy Research Laboratory 1168 Moriyama-cho, Hitachi-shi, Ibaraki-ken 319-11, Japan
5. Mitsubishi Atomic Power Industries, Inc. Tokai Technical Institute, 622-12, Funaishikawa, Tokai-mura Ibaraki-ken 319-11, Japan
6. Century Research Center Applied Engineering Department No. 1, 3-6-2 Nihonbashihon-cho Chuoo-ku, Tokyo 103, Japan