Author/Authors :
Onozuka، نويسنده , , M. and Alfile، نويسنده , , J.P. and Aubert، نويسنده , , Ph. and Dagenais، نويسنده , , J.-F. and Grebennikov، نويسنده , , D. and Ioki، نويسنده , , K. and Jones، نويسنده , , L. and Koizumi، نويسنده , , K. and Krylov، نويسنده , , V. and Maslakowski، نويسنده , , J. and Nakahira، نويسنده , , M. and Nelson، نويسنده , , B. and Punshon، نويسنده , , C. and Roy، نويسنده , , O. and Schreck، نويسنده , , G.، نويسنده ,
Abstract :
Development of welding, cutting and non-destructive testing (NDT) techniques, and development of remotized systems have been carried out for on-site manufacturing and maintenance of the thick-wall structure of the International Thermonuclear Experimental Reactor (ITER) vacuum vessel (VV). Conventional techniques, including tungsten inert gas welding, plasma cutting, and ultrasonic inspection, have been improved and optimized for the application to thick austenitic stainless steel plates. In addition, advanced methods have been investigated, including reduced-pressure electron-beam and multi-pass neodymium-doped yttrium aluminum garnet (NdYAG) laser welding, NdYAG laser cutting, and electro-magnetic acoustic transducer inspection, to improve cost and technical performance. Two types of remotized systems with different payloads have been investigated and one of them has been fabricated and demonstrated in field joint welding, cutting, and NDT tests on test mockups and full-scale ITER VV sector models. The progress and results of this development to date provide a high level of confidence that the manufacturing and maintenance of the ITER VV is feasible.
Keywords :
NDT , nuclear fusion , ITER , Welding , Thick wall , Cutting , Nuclear fusion reactor , Vacuum vessel
