Manufacturing Study and Trial Fabrication of Radial Plate for ITER Toroidal Field Coil

Japan Atomic Energy Research Institute (JAERI) has studied manufacturing processes of radial plates used in Toroidal Field coils of the International Thermonuclear Experimental Reactor (ITER). A manufacturing procedure, in which grooved radial plate blocks are connected by laser welding, was considered as the most rational one. A trial fabrication of a radial plate which has the same dimensions of the actual ITER was performed to clarify the feasibility of this procedure through the measurements of deformation during machining and welding. As a result, it was concluded that this manufacturing procedure could be used for the ITER because it could achieve the required tolerances for manufacturing of the radial plates