1. Nippon Atomic Industry Group Company, Ltd. NAIG Nuclear Research Laboratory, 4-1 Ukishima-cho Kawasaki-ku, Kawasaki 210, Japan
2. Hitachi, Ltd., Hitachi Works 3-1 Saiwai-cho, Hitachi 317, Japan
3. Toshiba Corporation, Isogo Engineering Center 8 Shinsugita-cho, Isogo-ku, Yokohama 235, Japan
4. Hitachi Engineering Co., Ltd. 3-2 Saiwai-cho, Hitachi 317, Japan
5. Tokyo Electric Power Co., Inc. 4-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100, Japan