Speaker
Antonino Cardella
(Broader Fusion Development)
Description
The JT-60SA Tokamak is provided with a cryogenic system with a refrigeration capacity of 9KW (eqv.) at 4.5 K. Before commissioning and during occasional warm-up periods the total 3.6 t helium inventory is stored in six pressure vessels, which have been procured by Europe. Each vessel is 22 m long, has a diameter of 4 m, a 250 m33 volume, and weighs about 73 t. As the vessels will store pure helium, the tightness and cleanliness requirements were quite demanding.
One of the vessels is also used to receive the cold helium (20K) from the cryogenic system quench line, following a fast discharge of the superconducting coils. A special 18 m long helium diffuser system and a thermal barrier connector at the quench line flange has been designed and manufactured to avoid local chilling of the vessel wall below the minimum allowed temperature of the material, due to the ingress of the cold helium.
The detailed design, manufacturing and testing of these large components have been completed on time and budget. The vessels have been shipped to Japan and transported from the port of entry to the Naka research centre. The vessels have then been installed on their foundations using a 500 t crane using a detailed assembly procedure.
This paper reports the design, manufacturing, testing and installation of the six large helium storage vessels for the JT60-SA cryogenic system.
Co-authors
Antonino Cardella
(Broader Fusion Development, F4E, Garching, Germany)
Antonio Figueiredo
(A. Silva Matos, Apartado 8, 3740-809, Sever do Vouga, Portugal)
Carmela Annino
(Broader Fusion Development, F4E, Garching, Germany)
Enrico Di Pietro
(Broader Fusion Development, F4E, Garching, Germany)
Frederic Michel
(Broader Fusion Development, F4E, Garching, Germany;INAC, CEA, 17 rue des Martyrs, France)
Joao Silva
(A. Silva Matos, Apartado 8, 3740-809, Sever do Vouga, Portugal)
Jorge Batista da Cruz
(A. Silva Matos, Apartado 8, 3740-809, Sever do Vouga, Portugal)
Kaname Kizu
(Tokamak System Technology, Japan Atomic Energy Agency, 801-1 Muko-yama, Naka-shi, Ibaraki-ken,, Japan)
Kyohei Natsume
(Tokamak System Technology, Japan Atomic Energy Agency, 801-1 Muko-yama, Naka-shi, Ibaraki-ken,, Japan)
Luigi Semeraro
(Broader Fusion Development, F4E, Garching, Germany)
Manfred Wanner
(Broader Fusion Development, F4E, Garching, Germany)
Nandor Hajnal
(Broader Fusion Development, F4E, Garching, Germany)
Yoshihiko Koide
(Tokamak System Technology, Japan Atomic Energy Agency, 801-1 Muko-yama, Naka-shi, Ibaraki-ken,, Japan)
