To realise the construction pit, a hole is dug measuring approximately 50 metres by 50 metres and 21 metres deep. This is done in several stages. First, trenches are dug 1,5 metres wide, into which concrete is poured to realise the diaphragm walls. These walls are anchored, and within these walls, 380 bored piles are placed, after which the soil is excavated and underwater concrete is poured to hold the empty pit in place and to base the reactor on later. The works are carried out by BESIX.
,,With this, we are taking another big step towards being able to start building the new PALLAS-reactor. Now that all the necessary permits are in place, we can proceed with the realisation of the construction pit, in which the PALLAS-reactor will be built.” - Peter Dijk, Director PALLAS Programme