Status of casing manufacturing for JT-60SA toroidal field coils

Highlights: • A contract between ENEA and Walter Tosto started on July 2012 for the construction of 18 TF coil casings for JT-60SA. • Detail design, qualification of welding process and manufacturing of mock-ups representative of the casing have been completed. • Casing manufacturing activities started in 2014 and fourteen casings have been satisfactorily completed within September 2016. • The completion of the procurement of eighteen casings and two spare ones for a total of twenty casings is foreseen in 2017. - Abstract: In the framework of the Broader Approach program, ENEA is in charge of supplying 20 Toroidal Field (TF) coil casings for the superconducting tokamak JT-60SA being assembled in Naka site, Japan. ENEA commissioned the company Walter Tosto (Chieti, Italy) to fabricate two sets of 10 casings each to be delivered to ASG Superconductors (Genoa, Italy) and General Electric (Belfort, France), in charge of the following integration of the winding packs into the casings. The composition of the casing components and the detail design of the interfaces have been finalized under the coordination of Fusion for Energy (F4E) and the agreement of the other parties. Two different sets of mock-ups representative of the components have been realized to validate fabrication methods and special welding processes. The manufacturing activities have been divided in different production steps: composition of the components by cutting, forming and welding and then machining to the final shape. The first seven casings have been completed during 2015 and are being used for the completion of the TF coils. On the base of manufacturing experience of the first casing components and the completion of the first coils, the production process has been improved and the schedule optimized. This paper reports the status of casing manufacturing.