Full scale trials for qualification of the manufacture of the ITER TF coils in Japan

• Published in: Fusion engineering and design Vol. 109-111; pp. 574 - 580
• Main Authors: Matsui, Kunihiro, Hemmi, Tsutomu, Kajitani, Hideki, Yamane, Minoru, Mizutani, Takumi, Nakano, Toshihide, Takano, Katsutoshi, Ando, Shinji, Koizumi, Norikiyo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2016
• Subjects: Double pancake; ITER; Toroidal field coil; Winding; Toroidal field coil; Double pancake; Winding; ITER
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2016.02.043

•High accuracy conductor winding of 0.1% was achieved in TF coil fabrication.•Conductor elongation due to heat treatment satisfied with the expected value of 0.06%±0.02%.•Commissioning of a transfer tooling without adding strain to conductor was completed.•Commissioning of a conductor insulation and CP welding was successfully completed. JAEA performed full-scale trials to qualify and optimize manufacturing procedure of TF coil fabrication prior to series production. In the full-scale trials, conductor winding, heat treatment, conductor transfer, conductor insulation and cover plate (CP) welding trials were performed to resolve some technical issues and to demonstrate the fabrication procedure. The followings are major achievement. (1) High accuracy conductor winding of 0.01%, (2) the evaluation of 0.06% conductor elongation due to heat treatment, (3) conductor transfer in a radial plate (RP) groove with addition strain under 0.1%, (4) conductor insulation without breakage of the insulation tape and (5) flatness of 2mm of the double pancake (DP) by CP welding. Then JAEA started the 1st TF coil fabrication from March 2014, and has already completed ten conductor windings and heat treatment of nine windings.