1. Japan Atomic Energy Research Institute Department of the High Temperature Engineering Test Reactor Project Oarai-machi, Oarai Research Establishment, Narita-cho, Oarai-machi Higashiibaraki-gun, Ibaraki-ken, 311-13, Japan
2. Japan Atomic Energy Research Institute Japan Atomic Energy Research Institute, Oarai-machi Oarai Research Establishment, Narita-cho, Oarai-machi, Higashiibaraki-gun Ibaraki-ken, 311-13, Japan