Manufacturing of the JT-60SA cryostat vessel body cylindrical section

摘要

The JT-60SA cryostat is a large vacuum vessel made up of 304 stainless steel which encloses the tokamak providing the vacuum environment to reduce thermal loads on the components at cryogenic temperature. It must withstand the external atmospheric pressure during normal operation and the internal overpressure in case of an accident. Due to functional purposes, the cryostat has been divided in three large assemblies: the Cryostat Base (CB), the Cryostat Vessel Body Cylindrical Section (CVBCS) and the Top Lid. The CB was manufactured in Spain and assembled in-situ in 2013, while the CVBC is currently under manufacturing also by a Spanish company and it is expected to be delivered in Naka next year 2017. This paper gives an overview of the manufacturing process and present status of the CVBCS. The manufacturing includes the assembly and testing at the manufacturer workshop as well as the packaging of the component. The reference code being used for the manufacturing is ASME 2007 Section VIII Div.2. (C) 2017 Elsevier B.V. All rights reserved.