1. Nuclear Energy Systems Laboratory, Cooperative Major in Nuclear Energy, Graduate School of Integrative Science and Engineering, Tokyo City University, Setagaya-Ku, Tokyo, Japan
2. Oarai Research and Development Institute, Japan Atomic Energy Agency, Higashi-Ibaraki-Gun, Ibaraki, Japan
3. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Naka-Gun, Ibaraki, Japan