Affiliation: | a Atomic Energy Research Laboratory, Musashi Institute of Technology, 971 Ozenji, Asao-ku, Kawasaki-shi, Kanagawa 215, Japan b Nuclear Reactor Research Institute, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152, Japan c Nuclear Power Division, Ishikawajima-Harima Heavy Industries Co., Ltd., 1, Shin-nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa 235, Japan |