A. Ogata, M. Arinaga, T. Kawakubo, K. Nakajima, H. Nakanishi, D. Whittum (KEK), T. Kobayashi, T. Ueda, Y. Yoshida (Nuclear Eng. Research Lab, Tokyo University), H. Shibata, S. Tagawa (Research Center Nuclear Science Technology, Tokyo University), Y. Nishida, N. Yugami (Utsunomiya U.)