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Latest ITER Newsline

  • Cryolines | Another day, another spool

    Having wedged his body and equipment into the cramped space between the ceiling and the massive pipe, a worker is busy welding two cryolines spools. A few metre [...]

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  • Image of the week | Bearings unveiled

    The construction teams are in the last stages of preparing the Tokamak pit for the first major operation of ITER machine assembly: the lowering of the cryostat [...]

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  • Technology | Perfecting tritium breeding for DEMO and beyond

    While ITER will never breed tritium for its own consumption, it will test breeding blanket concepts—the tools and techniques that designers of future DEMO react [...]

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  • Fusion world | Japan and Europe complete the assembly of JT-60SA

    The JT-60SA fusion experiment in Naka, Japan, is designed to explore advanced plasma physics in support of the operation of ITER and next-phase devices. After s [...]

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  • Manufacturing | Thermal shield milestone in Korea

    Six years after the start of fabrication, Korean contractor SFA has completed the last 40° sector of vacuum vessel thermal shield. The stainless steel panels, c [...]

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Of Interest

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On site

A runway for the cryostat

Kirsten Haupt

A section of runway-worthy tarmac has been completed at ITER. But no plane will ever land here.

Workers of the French company Colas finalize the surfacing by spreading concrete grout. The work was carried out under the responsibility of Fusion for Energy (F4E), the European Domestic Agency, and supervised by Engage, F4E's architect-engineer contractor. (Click to view larger version...)
Workers of the French company Colas finalize the surfacing by spreading concrete grout. The work was carried out under the responsibility of Fusion for Energy (F4E), the European Domestic Agency, and supervised by Engage, F4E's architect-engineer contractor.
On three consecutive evenings last summer, work proceeded into the night to finalize the surfacing on a 5,000 m² area near the Cryostat Workshop. The road works were carried out to prepare for the relocation of a completed section of the ITER cryostat—the 490-tonne lower cylinder—from the workshop to a dedicated storage area on the platform.

The combined weight of the cryostat section and its transport vehicle calls for airfield-grade paving materials. While regular roads have a load-bearing capacity of 5 tonnes per cubic metre, the surface in front of the Cryostat Workshop needs to withstand higher pressures of up to 20 tonnes per cubic metre. And like on airfields, the new pavement also has a higher resistance for turning loads.

In front of the 30-metre doors of the Cryostat Workshop, the surface has been reinforced to prepare for the removal of the first completed section—the 490-tonne lower cylinder. (Click to view larger version...)
In front of the 30-metre doors of the Cryostat Workshop, the surface has been reinforced to prepare for the removal of the first completed section—the 490-tonne lower cylinder.
A combination of specially designed materials ensures that the road surfacing—while only 15 centimetres thick—has the required properties. The compacted 11-centimetre-thick base layer consists of Optibase, an asphalt of a particular formulation developed for heavy-load roads. This has been topped with a thin layer of highly permeable asphalt. In a final step, workers spread a reinforcing concrete grout across the entire asphalt surface, allowing it to seep into all the cracks and open spaces. 

The surface in front of the Cryostat Workshop is now ready for the relocation of the lower cylinder to the nearby storage area, making space for the upper cylinder that will be assembled next.

It is only the first area on the platform that has been upgraded to airfield-like tarmac. Other roads on the platform will follow suit in receiving this treatment once the work on the underground service networks in those areas has been completed. This will include the stretch of road near the Cleaning Building as well as the roads leading to the Poloidal Field Coils Winding Facility and around the cryoplant.


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