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Journal Articles

Fundamental welding R&D results for manufacturing vacuum vessel of JT-60SA

Asano, Shiro*; Okuyama, Toshihisa*; Onawa, Toshio*; Yanagi, Yutaka*; Ejiri, Mitsuru*; Kanahara, Toshio*; Ichihashi, Koji*; Kikuchi, Atsushi*; Mizumaki, Shoichi*; Masaki, Kei; et al.

Fusion Engineering and Design, 86(9-11), p.1816 - 1820, 2011/10

 Times Cited Count:11 Percentile:69.09(Nuclear Science & Technology)

The real vacuum vessel (VV) manufacturing of JT-60SA has started since Nov. 2009 at Toshiba. Prior to starting manufacturing, fundamental welding R&Ds had been performed by three stages. In the first stage, primary tests for screening welding method were performed. In the second stage, the trial welding for 1m-long straight and curved double shell samples were conducted. The dependences of welding quality and distortion on the welding conditions, such as arc voltage and current, setting accuracy, welding sequence, the shape of grooves, etc. were measured. In addition, welding condition with low heat input was explored. In the last stage, fabrication sequence was confirmed and established by the trial manufacturing of the 20$$^{circ}$$ upper half mock-up. This poster presents the R&D results obtained in the first and second stages.

Oral presentation

Trial manufacturing of vacuum vessel for JT-60SA

Asano, Shiro*; Ejiri, Mitsuru*; Yanagi, Yutaka*; Ichihashi, Koji*; Kikuchi, Atsushi*; Mizumaki, Shoichi*; Okuyama, Toshihisa*; Masaki, Kei; Shibama, Yusuke; Katayama, Masahiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Real product manufacturing of vacuum vessel for JT-60SA

Asano, Shiro*; Ejiri, Mitsuru*; Okuyama, Toshihisa*; Yanagi, Yutaka*; Kikuchi, Atsushi*; Mizumaki, Shoichi*; Shibama, Yusuke; Masaki, Kei; Sakasai, Akira

no journal, , 

Based on the R&Ds including trial manufacturing of 20 deg. upper half mock-up, the real product manufacturing of vacuum vessel for JT-60SA has started since November 2009 at TOSHIBA Keihin Product Operations. The cross section of the VV is D-shaped and made of low cobalt content SUS316L. The height and outer diameter of the torus are 6.6m and 9.95m respectively. The weight is about 150 ton. The present status of the manufacturing is introduced in this poster presentation. 2009 for the inboard (IB) and since August, 2010 for the outboard (OB). Completed IB and OB 20-degree upper or lower segments for VV-D02 and VV-D03 will be connected into full 40-degree IB and OB segments from December, 2010. The welding between 40-degree IB and OB segments of the first 40-degree sector (VV-D02) is to be started at JAEA Naka Fusion Institute in 2011.

Oral presentation

Buckling analysis of gravity support legs for JT-60SA vacuum vessel

Ejiri, Mitsuru*; Kitamura, Kazunori*; Araki, Takao*; Omori, Junji*; Asano, Shiro*; Hayakawa, Atsuro*; Shibama, Yusuke; Masaki, Kei; Sakasai, Akira

no journal, , 

In the operation of tokamak, such loads as electromagnetic and seismic are assumed to be imposed on the vacuum vessel (VV), and not a little thermal expansion takes place when VV is baked. The gravity support leg (GS) has to support the loads described above in addition to the dead weight of VV including in-vessel components and compensate deformation. The GS is equipped with plate spring (PS) to have both stiffness and flexibility. In this study, the buckling strength of the PSs was evaluated. The effect of the initial imperfection of the PSs which is assumed to result from machining or welding process on the buckling strength was also studied. It is concluded that GS has sufficient buckling strength against assumed initial imperfections.

Oral presentation

Fatigue behavior on welded joint for JT-60SA vacuum vessel

Yanagi, Yutaka*; Shibui, Masanao*; Kanahara, Toshio*; Mochida, Tsutomu*; Ejiri, Mitsuru*; Asano, Shiro*; Shibama, Yusuke; Masaki, Kei; Sakasai, Akira

no journal, , 

JT-60SA Vacuum Vessel (VV) has D-shaped cross section and double-walled structure. It consists of the inner and outer wall reinforced by poloidal ribs and is made of SUS316L (Co$$<$$0.05wt%). The welding outer wall on rib (so called continuous plug) is performed from the outside of double-wall. Since it is difficult to confirm the penetration bead from the inside of double-wall, an incomplete penetration is assumed to be included in this welded joint. In this study, the fatigue test of continuous plug welded joint with an artificial incomplete penetration was performed to investigate the effect of the incomplete penetration on fatigue behavior and fatigue strength.

Oral presentation

Manufacturing of vacuum vessel for JT-60SA

Asano, Shiro*; Okuyama, Toshihisa*; Mochida, Tsutomu*; Kikuchi, Atsushi*; Odashima, Wataru*; Ejiri, Mitsuru*; Mizumaki, Shoichi*; Shibama, Yusuke; Masaki, Kei; Sakasai, Akira

no journal, , 

no abstracts in English

Oral presentation

Completion of vacuum vessel sector manufacturing and subsequent torus assembly for the JT-60SA

Asano, Shiro*; Okuyama, Toshihisa*; Ejiri, Mitsuru*; Mizumaki, Shoichi*; Mochida, Tsutomu*; Hamada, Takashi*; Araki, Takao*; Hayakawa, Atsuro*; Sagawa, Keiich*; Kai, Toshiya*; et al.

no journal, , 

no abstracts in English

Oral presentation

Gravity support design and manufacturing of the JT-60SA vacuum vessel

Ejiri, Mitsuru*; Asano, Shiro*; Omori, Junji*; Okuyama, Toshihisa*; Takahashi, Nobuji*; Yamada, Masahiro*; Araki, Takao*; Kai, Toshiya*; Shibama, Yusuke; Masaki, Kei; et al.

no journal, , 

In the operation of Tokamak device, such loads as electromagnetic and seismic are assumed to be imposed on the vacuum vessel (VV), and not a little thermal expansion takes place when VV is baked. The gravity support (GS) has to support the loads described above in addition to the dead weight of VV including in-vessel components and compensate deformation. The GS is equipped with leaf spring that has both stiffness and flexibility. In this study, the FEM analysis-based design and assembly procedure of the GS is reported. The manufacturing process of GS components is also reported with trial manufacturing results.

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