1. Nuclear Regulatory Agency, 1-9-9, Roppongi, Minato-ku, Tokyo, 106-8450, Japan
2. High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba-shi, Ibaraki 305-0801, Japan
3. RAD Engineering Consulting Office, 4-20-5, Sukegawa-cho, Hitachi, Ibaraki, 317-0065, Japan