Tokamak Complex assembly contractors are installing equipment now in the lowest level of the Tokamak and Diagnostics buildings (B2 and B2/Mezzanine), progressing around the Tokamak Pit in a counterclockwise direction before moving up to level B1.
The team needs to know exactly what kind of system will be installed inside and on either side of a penetration to design and fill it properly. "First, you reduce the large openings with concrete backfilling, designed with specific cut-outs for cables, for example, pull them through, then seal the gaps with infilling materials to restore the wall and give it back all its properties in terms of fire protection and sectorization, confinement and radiation shielding," explains Benjamin Moellinger, coating and corrosion engineer. "You can't move along with the build and put your systems through until you get the penetration designed and backfilled."
Some 4,600 penetrations, or openings, will provide passage for pipes, cables, diagnostics and HVAC equipment between the rooms and buildings of the Tokamak Complex. The example in this photo illustrates how the penetrations must be backfilled with concrete, while providing passageway for in/out cooling water pipes.