1. Tohoku University Department of Nuclear Engineering Aramaki-Aoba, Sendai 980, Japan (0222) 22-1800
2. University of Tokyo Nuclear Engineering Research Laboratory Tokai-mura, Ibaraki-ken, 319-11, Japan (0292) 82-1611
3. University of Tokyo Department of Nuclear Engineering Hongo, Bunkyo-ku, Tokyo 113, Japan (03) 812-2111
4. Tokyo Institute of Technology Research Laboratory of Nuclear Reactors O-okayama, Meguro-ku, Tokyo 152, Japan (03) 726-1111
5. Nagoya University Department of Nuclear EngineeringFuro-cho, Chikusa-ku, Nagoya 464, Japan (052) 781-5111
6. Osaka University Department of Nuclear EngineeringYamadaoka, Suita, Osaka 565, Japan (06) 877-5111