Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Question of the week | Will fusion run out of fuel?

    One of the paradoxes of fusion, the virtually inexhaustible energy of the future, is that it relies on an element that does not exist—or just barely. Tritium, o [...]

    Read more

  • Managing data | Setting up a robust process

    Are the ITER systems and processes robust enough to manage the technical and project data for a program of ITER's complexity? Will quality information be made a [...]

    Read more

  • Image of the week | Bullseye

    Two perfectly circular structures, looking a lot like archery targets, have been installed on the west-facing wall of the Tokamak Complex. They are not for sh [...]

    Read more

  • Art and science | Seeking new perspectives on fusion

    Standing in the middle of the Tokamak Building, sound artist Julian Weaver positions his 3D microphone near one of the openings of the bioshield to record the s [...]

    Read more

  • Worksite photos | The view one never tires of

    For the past three-and a half years, ITER Communication has been documenting construction progress from the top of the tallest crane on the ITER worksite. Altho [...]

    Read more

Of Interest

See archived articles

Design phase concludes for ITER rectangular bellows

Igor Sekachev, Cryostat and VVPSS Section

At the Swiss firm Kompaflex, where the water pressure test on the full-size rectangular bellows prototype was successfully carried out: Guillaume Vitupier and Igor Sekachev from ITER (front row) and the Kompaflex team: Werner Löhrer, CEO (centre); Remo Hribernigg, project leader; Bairush Ajeti, expediting; Antonio Coelho Soares, certified welder; and Markus Kaltenhauser, head of engineering. (Click to view larger version...)
At the Swiss firm Kompaflex, where the water pressure test on the full-size rectangular bellows prototype was successfully carried out: Guillaume Vitupier and Igor Sekachev from ITER (front row) and the Kompaflex team: Werner Löhrer, CEO (centre); Remo Hribernigg, project leader; Bairush Ajeti, expediting; Antonio Coelho Soares, certified welder; and Markus Kaltenhauser, head of engineering.
Testing has ended on a full-scale, rectangular bellows prototype at the Swiss firm Kompaflex (kompaflex ag), successfully completing the last step in the bellows design.

Eighty-five large, rectangular bellows will be used between the ITER vacuum vessel, the cryostat and the walls of the Tokamak Building themselves to isolate the ultra-high vacuum inside the cryostat from the building port cell environment, and to compensate relative movement that can occur during different operational regimes like baking of the vacuum vessel, or during seismic events.

On 27 August, a 3.2 x 3.6 metre prototype of the upper port duct bellows successfully passed pressure stability tests. Even in the case of the largest required pressure of 0.6.bar across the bellows—only predictable elastic deformation of the bellows was caused and following pressure relief, the bellow convolutions returned to their initial position. Only at 1bar pressure across the bellows the first small plastic deformations of 2mm were detected, which showed significant design margin to the pressure requirements.

The fatigue life test of the bellows was also successfully completed. Kompaflex has the capacity to produce a multi-ply rectangular construction of bellows without welding seams in the corner area, fulfilling ITER's requirement for very short building length, enormous movements in combination with a certain number of cycles, and low spring rates. A rectangular bellows with a very short convoluted length was tested for an axial movement range of 136 mm and the requested number of 500 cycles was fulfilled without any damage.

After completion of the design work on the bellows end connections, the Final Design Review for the rectangular bellows is scheduled for April 2015. The signature of the Procurement Arrangement will follow.


return to the latest published articles