The Structural Design of ITER Tokamak Sub-assembly Tools

The Structural Design of ITER Tokamak Sub-assembly Tools

ITER (International Thermonuclear Experimental Reactor) tokamak assembly mainly comprises sub-assembly and in-pit assembly. The tools for sub-assembly procedure consist of the tools for upending, sector lifting, vacuum vessel support and bracing, and sector sub-assembly, among which the design of three tools, excluding sector lifting, 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. The upending and sub-assembly tool turned out safe against the seismic loads, while vacuum vessel support and bracing one gave large toroidal bending of 68 mm and the resultant high stress of 856 MPa at the lower region of vacuum vessel. Design improvement for this tool is on-going.?

ITER (International Thermonuclear Experimental Reactor) tokamak assembly mainly comprises sub-assembly and in-pit assembly. The tools for sub-assembly procedure consist of the tools for upending, sector lifting, vacuum vessel support and bracing, and sector sub-assembly, among which the design of three tools, excluding sector lifting, 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. The upending and sub-assembly tool turned out safe against the seismic loads, while vacuum vessel support and bracing one gave large toroidal bending of 68 mm and the resultant high stress of 856 MPa at the lower region of vacuum vessel. Design improvement for this tool is on-going.?