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News & Media

Latest ITER Newsline

  • CODAC | The "invisible system" that makes all things possible

    It is easy to spot all the big equipment going into ITER; what is not so visible is the underlying software that makes the equipment come alive. Local control [...]

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  • Assembly | Zero-gravity in a cramped place

    The volume of the Tokamak pit may be huge, but so are the components that need to be installed. As a result, assembly operators will have very little room to ma [...]

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  • Image of the week | A closer look at KSTAR

    Over its twelve years of operation, the KSTAR tokamak (for Korea Superconducting Tokamak Advanced Research) has built an extremely valuable database for the fut [...]

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  • Pre-compression rings | Six of nine completed

    The European Domestic Agency is responsible for the fabrication of nine pre-compression rings (three top, three bottom and three spare). The first five have bee [...]

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  • Industrial milestone | Japan completes the first D-shaped coil of the ITER Tokamak

    In a ceremony on 30 January, a major industrial achievement was celebrated in Japan—the completion of the first 360-tonne D-shaped toroidal field coil for the I [...]

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Of Interest

See archived entries

Vacuum vessel in Europe

Assembling the puzzle

Five thousand tonnes of steel, dozens of "port" openings at three levels, interfaces with nearly every major system ... ITER's steel vacuum vessel is one of the largest-scale and most complex of the ITER "objects" to manufacture.

Assembly work is underway on one of the sub-segments of vacuum vessel sector #5. Vacuum vessel manufacturing is time-consuming and labour intensive due to the sheer volume of sub-elements, their unconventional shapes, and their size. (Click to view larger version...)
Assembly work is underway on one of the sub-segments of vacuum vessel sector #5. Vacuum vessel manufacturing is time-consuming and labour intensive due to the sheer volume of sub-elements, their unconventional shapes, and their size.
In Europe, which is producing five of the nine vacuum vessel sectors, a consortium of industrial firms has divided out the tasks of manufacturing the many sub-elements of each sector, step-by-step assembly activities, and demanding welding and non-destructive examination stages.

With contractors and subcontractors located across Europe, the European vacuum vessel fabrication consortium (see more here) has sought to increase its manufacturing capacity. In a recent article on vacuum vessel manufacturing progress, the European Domestic Agency reports that all five sectors are now in some stage of fabrication, with sector #5—the first due on site according to the ITER machine assembly schedule—leading the pack.

European companies CNIM (France), ENSA (Spain), MAN (Germany), ProBeam (Germany), Belleli (Italy), Mangiarotti (Italy), Walter Tosto (Italy), and Ansaldo Nucleare (Italy) are all involved.

Vacuum vessel manufacturing is time-consuming and labour intensive due to the sheer volume of sub-elements, their unconventional shapes, and their size. At the end of the process, each sector will measure 6.5 metres high, 3 x 6 metres in width and depth, and weigh between 400 and 500 tonnes. Fabrication is a multiyear process that has involved multiple qualification phases before passing on to manufacturing design, material procurement, precise machining, and finally welding. Because the vacuum vessel and ports are classified as nuclear pressure equipment under French ESPN regulations, the welding and non-destructive examination activities are submitted to particularly stringent specifications.

For the European industries involved participation in such a high-profile and demanding manufacturing project has contributed to increasing their expertise and skill base, and improving their competitiveness on world markets. (See related article in this issue.)

Read the full article on the European Domestic Agency website here.


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