Affiliation: | 1. Research Reactor Institute, Kyoto University, Kumatori, Osaka, 590-0494, Japan 2. Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan 3. Japan Atomic Energy Agency, Tokai, Ibaragi, 319-1195, Japan 4. Nuclear Power Safety Division, Fukushima Prefectural Government, Fukushima, 960-8043, Japan
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