Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Worksite | First pillars for the crane hall

    For the overhead cranes to deliver machine components into the Tokamak assembly pit, the rails that carry them need to be extended some 80 metres beyond the tem [...]

    Read more

  • Transport | 300 tonnes of equipment on its way to ITER

    A specially designed assembly tool and elements of the cryostat and vacuum vessel thermal shields are part of the shipments travelling now from Korea to ITER. W [...]

    Read more

  • Fusion world | A new tokamak in town

    After EAST in China and WEST in France, another of the cardinal points of the compass has been chosen to name a tokamak. Introducing NORTH—the NORdic Tokamak de [...]

    Read more

  • Opportunities | Bringing the ITER Business Forum to Washington

    Every second year, a two-day ITER Business Forum is held to invite existing and potential suppliers for the ITER Project—laboratories, universities, and compani [...]

    Read more

  • World Energy Congress | Fusion "at a time of transition"

    In the United Arab Emirates, Abu Dhabi is often referred to as a tourism hotspot that combines luxury and ancient traditions. In September, Abu Dhabi was in the [...]

    Read more

Of Interest

See archived entries

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