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  • On site | ITER celebrates important milestones

    On 16 June 2022, the ITER amphitheatre was packed with life again after two years of silence, part of a new project culture initiative called "Commit to De [...]

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  • Port cell maintenance | A full-scale mockup for dress rehearsals

    Every port in the ITER vacuum vessel has a corresponding port cell in the Tokamak Building. These corridor-like spaces allow heating and fuelling pipes, electri [...]

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  • Magnets | Have the last pancake!

    After close to five years of intense activity, the winding table at the south end of the European poloidal field coil factory on site is now empty. Last week, t [...]

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  • 30th ITER Council: Progress in a time of challenge and transition

    The Council chamber on the fifth floor of the ITER Headquarters building resonated once again with the sound of voices as Member representatives gathered for th [...]

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  • Open Doors Day | Back together again

    After more than two years, ITER has resumed a tradition that dates back to 2007—Open Doors Day. On Saturday 18 June, more than 50 "volunteers," staff [...]

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Of Interest

See archived entries

Pouring the protective circle

Since construction of the ground support structure for the Tokamak Complex began in 2010, huge volumes of concrete have been poured to form the edifice's seismic foundations, retaining walls, and basemat. Since November 2014 work has been underway on the Complex's basement-level walls and pillars.

In the early hours of Wednesday, 21 October, workers poured the first 200° segment of the bioshield, in an all-day operation that took some 15 hours to complete. (Click to view larger version...)
In the early hours of Wednesday, 21 October, workers poured the first 200° segment of the bioshield, in an all-day operation that took some 15 hours to complete.
But concrete pouring in a nuclear building is never routine, with each pour day marking the end of months of calculations, modellization and painstaking preparation.

For the ITER bioshield—the 3.2-metre-thick "ring fortress" surrounding the machine, whose role is to protect workers and the environment from the radiation generated by the fusion reaction—preparations have been particularly complex. Realizing a "perfect pour" for such a massive and strategic structure is so important that it was practised in a specially constructed full-scale mockup on the platform.

The density of the lattice of steel reinforcement makes the use of traditional concrete vibrators—used to encourage the concrete to reach every recess—impractical. As a consequence, an extra-fluid, self-compacting concrete was selected by the contractors and trialled in the on-site mockup.

At the end of the day 600 m³ of concrete were in place (centre circle), filling over half of the bioshield's circumference. (Click to view larger version...)
At the end of the day 600 m³ of concrete were in place (centre circle), filling over half of the bioshield's circumference.
The conclusive results allowed pouring operations to begin. In the early hours of Wednesday, 21 October, workers poured the first 200° segment of the bioshield, in an all-day operation that took some 15 hours to complete.

As dusk settled on the ITER site 600 m³ of concrete were in place, filling over half of the bioshield's circumference. The pouring of the remaining 160° segment is scheduled in January 2016.


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