1. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology O-Okayama, Meguro-ku, Tokyo 152, Japan
2. Meiji University, School of Science and Technology Higashimita, Tama-ku, Kawasaki 214, Japan
3. Institute of Research and Innovation Nuclear Chemistry and Chemical Engineering Center, Kashiwa, Chita 277, Japan
4. Power Reactor and Nuclear Fuel Development Company Nuclear Fuel Development Division, Tokai-mura, Ibaraki 319-11, Japan
5. Tokyo Electronic Power Company, Nuclear Fuel Cycle Department 4-1 Egasaki-cho, Tsurumi-ku, Yokohama 230, Japan