4 2 3 2 Corium stabilisation device* In the event of a core melt accident, if the corium* perforates the pressure vessel, a system of hatches is actuated and enables the water that has accumulated in the containment’s sumps zone to cover the layer of corium* that has spread out and thus enable it to be cooled via the containment’s ultimate cooling system 1 . This system prevents melt‑through of the bottom of the reactor containment. Sumps Corium Reactor pressure vessel Hatch Supply from the ultimate heat sink Pumps supply water from the groundwater, ponds or storage tanks on the one hand to the steam generators and, on the other, to the fuel storage pool. 3 Steam generators Ultimate heat sink Spent fuel pool Emergency supply tank The issues of the 4th periodic safety review of the 1,300 MWe nuclear reactors • 15
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