1. Japan Atomic Energy Research Institute 2-4 Shirakata Shirane, Tokai-mura, Ibaraki, 319-11 Japan
2. Mitsubishi Atomic Power Industries, Inc. 4-1 Shibakouen 2-chome, Minato-ku, Tokyo, 105 Japan
3. The Japan Research Institute, Limited 5-37 Kamiohsaki 4-chome, Shinagawa-ku, Tokyo, 141 Japan