量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
Thank you very much for using our website. On the 11th of March 2019, this site was moved from our own network server to the JAIRO Cloud network server. If you previously bookmarked this site, that bookmark will no longer work. We would be grateful if you could bookmark the website again. Thank you very much for your understanding and cooperation.
DEMO reactors require advanced neutron multipliers that have higher stability at high temperature. Beryllium intermetallic compounds (beryllides) are the most promising advanced neutron multipliers. Development of the advanced neutron multipliers has been started between Japan and the EU in the DEMO R&D of the International Fusion Energy Research Centre (IFERC) project as a part of the Broader Approach activities. In Japan, beryllides fabrication R&D has been carried out in the DEMO R&D building at IFERC, Rokkasho.
The Beryllium (Be) Handling Room has been installed in the DEMO R&D building. In this facility, synthesis, treatment, machining and characterizations of beryllides and its pebbles are being performed. Beryllium and its alloys (> 3 wt.% Be) are defined as controlled chemical substances in Japan. Therefore, equipment for safely handling beryllium is required; furthermore, regulatory authorities need to be notified of its use. The maximum concentration of beryllium was limited to < 0.001 mg/m3, the beryllium content in the beryllium handling area was monitored twice a year, and the controlled air velocity of the hoods that handled beryllium was maintained at 1 m/s according to the regulations.
Facility introduction and safety issues in Rokkasho Fusion Institute, QST
