1. Japan Atomic Energy Agency, 4002 Narita, O-arai, Ibaraki 311-1393, Japan e-mail:
2. Mitsubishi FBR systems, Inc., 2-34-17, Jingumae Shibuya-ku, Tokyo 150-0001, Japan e-mail:
3. TEPCO Systems Corporation, 2-37-28, Eitai Koto-ku, Tokyo 135-0034, Japan e-mail:
4. Mitsubishi Heavy Industries, Ltd., 5-717-1 Fukahori, Nagasaki, Nagasaki 851-0392, Japan e-mail: