Safe disassembly and storage of radioactive components of JT-60U torus |
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| Affiliation: | 1. Associazione EURATOM-ENEA, Department of Industrial Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, Italy;2. Grupo de Tratamiento de Imágenes, E.T.S.I de Telecomunicación, Universidad Politécnica de Madrid, Spain;3. EURATOM/CCFE Association, Culham Science Centre, Abingdon, United Kingdom;4. Video Processing and Understanding Laboratory, Universidad Autónoma de Madrid, Spain;1. Associazione EURATOM-ENEA sulla Fusione, Via Enrico Fermi 45, 00044 Frascati, Rome, Italy;2. Karlsruhe Institute of Technology KIT, Institute for Neutron Physics and Reactor Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;3. European Commission, DG Research & Innovation K5, CDMA 00/030, B-1049 Brussels, Belgium;1. VTT Technical Research Centre of Finland, P.O. Box 1300, FI-33101 Tampere, Finland;2. Tampere University of Technology, Korkeakoulunkatu 6, 33720 Tampere, Finland;1. CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain;2. IDOM, Avda. Monasterio de El Escorial 4, 28049 Madrid, Spain;1. EURATOM/CCFE Association, Culham Science Centre, Abingdon, United Kingdom;2. University of Rome ‘Tor Vergata’, Via del Politecnico 1, 00133 Rome, Italy;1. Institute of Plasma Physics, AS CR v.v.i., Prague, Czech Republic;2. Institute of Energy and Climate Research – Plasma Physics, Forschungszentrum Juelich, Germany;3. Ecole Nationale Superieure des Arts et Metiers, France;4. CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France |
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| Abstract: | Disassembly of the JT-60U torus was started in 2009 after 18 years of D2 operations and was completed in October 2012 for assembling the JT-60SA torus at the same position. The JT-60U torus was featured by the complicated and welded structure against the strong electromagnetic force, and by the radioactivation due to deuterium–deuterium (D–D) reactions. Since this work is the first experience of disassembling a large radioactivated fusion device in Japan, careful preparations of disassembly activities, including treatment of the radioactivated materials and safety work, have been made. During the disassembly period over 3 years, careful measures against exposure were taken and stringent control of exposure dose were implemented, and as a result, accumulated collective effective dose of ∼41,000 person-day to workers was only ∼22 mSv in total and no internal exposure was observed. About 13,000 components cut into pieces with measuring the contact dose were removed from the torus hall and stored safely in storage facilities. The total weight of the disassembly components reached up to ∼5400 tonnes. Most of the disassembly components will be treated as non-radioactive ones after the clearance level inspection under the Japanese regulations in the future. The assembly of JT-60SA has started in January 2013 after this disassembly of JT-60U torus. |
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| Keywords: | Disassembly JT-60U Radioactivation Fusion device Clearance JT-60SA |
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