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(ITERP/17) Progress and Achievements on the R&D Activities for ITER Vacuum Vessel

M. Nakahira¹⁾, K. Koizumi¹⁾, H. Takahashi¹⁾, M. Onozuka²⁾, K. Ioki²⁾, E. Kuzumin³⁾, V. Krylov³⁾, J. Maslakowski⁴⁾, B. E. Nelson⁴⁾, L. Jones⁵⁾, W. Danner⁵⁾,D. Maisonnier^5)
 
1) JA Home Team, Japan Atomic Energy Research Institute (JAERI), Ibaraki, Japan
²⁾ ITER Joint Central Team, Garching Joint Work Site, Garching, Germany
³⁾ RF Home Team, Efremov Institute, St. Petersburg, Russian Federation
⁴⁾ Oak Ridge National Laboratory, USA
⁵⁾ EU Home Team, EFDA, Max-Planck Institute, Garching, Germany

Abstract.  The ITER vacuum vessel (VV) is designed to be large double-walled structure with a D-shaped cross-section. The achievable fabrication tolerance of this structure was unknown due to the size and complexity of shape. The Full-scale Sector Model of ITER Vacuum Vessel, which was 15m in height, was fabricated and tested to obtain the fabrication and assembly tolerances. The model was fabricated within the target tolerance of ±5mm and welding deformation during assembly operation was obtained. The port structure was also connected using remotized welding tools to demonstrate the basic maintenance activity. In parallel, the tests of advanced welding, cutting and inspection system were performed to improve the efficiency of fabrication and maintenance of the Vacuum Vessel. These activities show the feasibility of ITER Vacuum Vessel as feasible in a realistic way. This paper describes the major progress, achievement and latest status of the R&D activities on the ITER vacuum vessel.

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