Enable Recite

Subscribe options

Select your newsletters:

Please enter your email address:

@

Your email address will only be used for the purpose of sending you the ITER Organization publication(s) that you have requested. ITER Organization will not transfer your email address or other personal data to any other party or use it for commercial purposes.

If you change your mind, you can easily unsubscribe by clicking the unsubscribe option at the bottom of an email you've received from ITER Organization.

For more information, see our Privacy policy.

News & Media

Latest ITER Newsline

  • FEC 2020 | E-conference opens, participation never higher

    The 28th IAEA Fusion Energy Conference (FEC) is off to an auspicious start. Open to the public for the first time thanks to the technical possibilities of an al [...]

    Read more

  • Vacuum vessel in Europe | Fitting the pieces virtually

    A 'virtual fit' tool developed by the European Domestic Agency is helping the vacuum vessel manufacturing team anticipate the challenge of final assembly—the mo [...]

    Read more

  • Gas injection system | Last manifolds completed in China

    Contractors to the Chinese Domestic Agency have completed an important part of the gas injection system—the distribution manifolds that carry gas species from t [...]

    Read more

  • Magnets | Seventh vertical coil reaches ITER

    Seven toroidal field coils have reached ITER in the past year. The latest, TF3 from Europe, passed through the ITER gates on Friday 3 May. The European and Japa [...]

    Read more

  • Tritium Building | Work resumes

    The energy-producing plasmas in ITER will be fuelled in equal measure by the hydrogen isotopes deuterium and tritium. Deuterium is a stable element that industr [...]

    Read more

Of Interest

See archived entries

Design phase concludes for ITER rectangular bellows

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