I. Introduction
The magnet system for ITERX consists of 18 Toroidal Field (TF) coils, a Central Solenoid (CS) coil stack with 6 coils modules, 6 Poloidal Field (PF) coils and 18 Correction Coils (CC) [1]. The coils are wound from Cable-In-Conduit Conductors (CICC) made up of Nb3Sn or Nb-Ti superconducting and copper strands assembled into a multistage, rope-type cable inserted into a conduit (jacket) of butt-welded austenitic steel tubes [2]. The steel primary heats (melts) are required to be subjected to an Electroslag Remelting (ESR) to reduce the size of inclusions and limit the risk of macro-inclusions. The jacket sections are then produced by hot extrusion followed by cold drawing and with some intermediate and final solution annealing steps. The jacket material and shape vary depending on the coil type. A summary of ITER jacket types, dimensions after compaction and total amount of steel to be produced is given in Table I. Data for CC jackets will be shown only as mean values in the summary Table IV. In order to be accepted for the conductor manufacture, every jacket section produced is inspected by Non-Destructive-Examination techniques and product analysis is performed on each lot to check, among others, the grain size, ferrite content, micro-inclusion and inter-granular corrosion presence.