The Structural Design of ITER Tokamak In-pit Assembly Tools

ITER (International Thermonuclear Experimental Reactor) tokamak assembly mainly comprises sub-assembly and in-pit assembly. The tools for in-pit assembly procedure consist of the tools for Toroidal Field (TF) magnet gravity support assembly, TF magnet inner support, TF coil bracing, and TF coil, vacuum vessel, and thermal shield assembly, among which the design of TF magnet inner support and TF coil bracing tools with sector lifting tool, one of the sub-assembly tool, is described herein. The basic structures for these tools have been developed. The structural stabilities have been studied by using ANSYS code, against the seismic loads of SL-2 level for the two candidate ITER sites, Cadarache in France and Rokkasho in Japan, respectively1. Dynamic analyses using FRS (Floor Response Spectrum) have been performed for the TF magnet inner support and TF coil bracing tools, while an equivalent static analysis was done for the sector lifting tool. The sector lifting tool turned out safe against the seismic loads. The dynamic analyses for the TF support and bracing tool, however, showed a relatively large displacement of 30 mm, which can lead to contact between components. Design improvement for this tool is on-going. KCI Citation Count: 0