1. Mitsubishi FBR Systems, 2-34-17, Jingumae, Tokyo 150-0001, Shibuya-ku, Japan e-mail:
2. Japan Atomic Energy Agency, 4002, Narita-cho, Oarai-machi 311-1393, Ibaraki, Japan e-mail:
3. Shimizu Corporation, 2-16-1, Kyobashi, Chuo-ku 104-8370, Tokyo, Japan e-mail:
4. Bridgestone Corporation, 1, Kashio-cho, Totsuka-ku, Yokohama 244-8510, Kanagawa, Japan e-mail: