Speaker
Jose Botija
(Fusion National Laboratory)
Description
The JT-60SA project implemented by Japan and Europe is progressing on schedule towards the first plasma in 2019. Spain (Ciemat) is in charge of the design and manufacturing of the cryostat.
The JT-60SA cryostat is a stainless steel vacuum vessel (14m diameter, 16m height) which encloses the tokamak providing the vacuum environment (10-3-3 Pa). It must withstand the external atmospheric pressure during normal operation, and internal overpressure in case of an accident (0.12 MPa absolute). The cryostat design is subdivided, for functional purposes, in two large assemblies: the Cryostat Vessel Body Cylindrical Section (CVBCS) and the Cryostat Base (CB). For transport and assembly reasons the cryostat is made up of 20 main parts: 7 making up the CB and 13 making up the CVBCS (including the top lid). All of the joints between them rely on bolted flanges together with light seal welds, non-structural fillet welds performed from inside and/or outside of the cryostat. The single wall is externally reinforced with ribs to support the weight of all the ports and port plugs and also to withstand the vacuum pressure. The material SS 304 (Co˂0.05 wt%) with a permeability (µrel) below 1.1. The CB was manufactured and assembled in-situ in 2013, while the CVBC is currently under manufacturing by a Spanish company and it is expected to be delivered in Naka next year 2017. The CVBCS is made of a single wall stainless steel shell with a thickness of 34mm.
This paper summarizes the manufacturing of the JT-60SA CVBCS. The manufacturing includes the assembly and testing at the manufacturer workshop as well as the packaging of the component. Packaging must be suitable for shipping the component to a port of entry in Japan. The reference code being used for the manufacturing is ASME code 2007.
Co-authors
A. Cardella
(Fusion For Energy, IPP/D1 Boltzmannstrasse 2 Garching 85748, Germany)
Akira Sakasai
(Department of Tokamak System Technology, Japan Atomic Energy Agency, Mukouyama Naka-shi IBARAKI, Japan)
Alfonso Soleto
(Fusion National Laboratory, Ciemat, Avenida Complutense 40, 28040 Madrid, Spain)
Alvaro Garcia
(ASTURFEITO, S.A, Avda. de la Siderurgia 17, 33417 Avilés – Asturias, Spain)
Esther Rincon
(Fusion National Laboratory, Ciemat, Avenida Complutense 40, 28040 Madrid, Spain)
Francisco Ramos
(Fusion National Laboratory, Ciemat, Avenida Complutense 40, 28040 Madrid, Spain)
Javier Alonso
(Fusion National Laboratory, Ciemat, Avenida Complutense 40, 28040 Madrid, Spain)
Jose Botija
(Fusion National Laboratory, Ciemat, Avenida Complutense 40, 28040 Madrid, Spain)
Kei Masaki
(Department of Tokamak System Technology, Japan Atomic Energy Agency, Mukouyama Naka-shi IBARAKI, Japan)
Luis Alvarez
(ASTURFEITO, S.A, Avda. de la Siderurgia 17, 33417 Avilés – Asturias, Spain)
Mercedes Medrano
(Fusion National Laboratory, Ciemat, Avenida Complutense 40, 28040 Madrid, Spain)
Pilar Fernandez
(Fusion National Laboratory, Ciemat, Avenida Complutense 40, 28040 Madrid, Spain)
Santiago Cabrera
(Fusion National Laboratory, Ciemat, Avenida Complutense 40, 28040 Madrid, Spain)
Yusuke Shibama
(Department of Tokamak System Technology, Japan Atomic Energy Agency, Mukouyama Naka-shi IBARAKI, Japan)
