Establishment of Production Process of JK2LB Jacket Section for ITER CS

The Japan Atomic Energy Agency is responsible for the procurement of the central solenoid (CS) conductor for ITER. The CS conductor uses a circular-in-square type sheath tube (jacket, outer dimension: 49 mm × 49 mm square, inner diameter: 32.6 mm) made of high manganese stainless steel JK2LB. The CS jacket suffers high electromagnetic force with 60,000 cycles during its lifetime. Prior to mass-production of CS jacket sections for the ITER machine, production of 170 units of jacket sections has been carried out. During production, it was confirmed that dimensional and mechanical performances satisfy the ITER requirements. The nondestructive examination procedure for the CS jacket sections has been developed. As a result, mass-production processes of CS jacket have been established.