Only concrete shielding is not sufficient for the goal of a dose rate < 0.5 uSv/h during Super-FRS operation. In the target area also side walls of iron and an iron roof wil be constructed.
Side walls will consist of two rows of big iron blocks on each side (1.6m on each side) and the roof made of at least 0.87m of steel plates with an extra 0.2m concrete cover.