1. JT-60 Safety Assessment Group, Japan Atomic Energy Agency, Mukoyama, Naka-shi, Ibaraki-ken, 311-0193, Japan
2. Hydrogen Isotope Research Center, University of Toyama, Gofuku, Toyama-ken, 930-8555, Japan
3. ITER Project Management Group, Japan Atomic Energy Agency, Mukoyama, Naka-shi, Ibaraki-ken, 311-0193, Japan