1. Faculty of Engineering, Hokkaido University, Kita-ku Kita 13, Nishi 8, Sapporo, Hokkaido, Japan.
2. Taiheiyo Consultant Co., 2-27-8, Higashinihonbashi, Chuo-ku, Tokyo 103-0004, Japan.
3. Radioactive Waste Management Funding and Research Center, 1-15-7, Tukishima, Chuo-ku, Tokyo 104-0052, Japan.