Building ITER

Thirty-nine buildings and technical areas house the ITER Tokamak and its plant systems. The heart of the facility—the Tokamak Building—is a seven-storey structure in reinforced concrete that sits 13 metres below the platform level and 60 metres above. Pre-assembly of Tokamak components takes place in the adjacent Assembly Hall. Other auxiliary buildings in the vicinity of the Tokamak Building include cooling towers, electrical installations, a control room, facilities for the management of waste, and the cryogenics plant that will provide liquid helium to cool the ITER magnets.

Europe, as part of its commitments to the project, is building nearly all of the platform buildings and site infrastructure.

Each building, once structurally complete, is handed over to the ITER Organization for the installation and assembly of equipment. According to the European Domestic Agency, the number of workers involved in site construction peaked in 2017-2018 at approximately 2,000 people. Now, although there are still European construction teams on site, a large additional workforce is contributing to machine and plant assembly and installation operations. An estimated 5,000 people are regularly present on the worksite, including management, engineering and supervisory teams from the ITER Organization, the European Domestic Agency, and their contractors.

The ITER Organization has overall responsibility for the successful integration and assembly of components delivered to the ITER site by the seven ITER Members. Machine assembly began in 2020. See the assembly pages to read about progress.