Progress of ITER TF Coil Case Fabrication in Japan

National Institutes for Quantum and Radiological Science and Technology (QST), which has been Japan Atomic Energy Agency up to March 2016, as Japan Domestic Agency, has responsibility to procure 19 coil cases for ITER toroidal field coils (TFCs) as in-kind components. The TFC case (TFCC) is a large structure having a D-shape with a height of 16.5 m, a width of 9 m, and a weight of about 200 tons. Because TFCC is a large welded structure, severe dimensional tolerance is required, such as a +/-2.0 mm profile. In order to minimize the technical risk during manufacture of the TFCCs, QST has performed trials to establish manufacturing procedures before commencement of the actual manufacturing. After the establishment of manufacturing procedures, QST began the manufacture of the first TFCC in August 2012. In parallel with actual manufacturing processes, some trials have been conducted to rationalize some manufacturing processes, while establishing others. Finally, the first unit of TFCC is scheduled to arrive at coil assembly at the end of 2017.