ASNR’S DECISION AND REQUIREMENTS Reinforced protection against hazards EDF plans, in particular, to reinforce ventilation and air conditioning systems to mitigate the risk of heatwaves, and to protect equipment and integrate new fire extinguishing systems to mitigate the risk of fire. Corium stabilisation device In the event of a core meltdown accident, the corium stabilisation device is designed to prevent melt-through of the lower slab of the reactor building by flooding the corium with water after spreading. EDF also plans to increase the thickness of this lower slab. Corium Hatch Reactor vessel Steam generators Ultimate heat sink Spent fuel pool Water make-up system New water make-up system The new system will supply the steam generators and spent fuel pool with water from the ultimate water source. Priority improvements to be ca from the ten-yearly outage and The periodic safety review will lead to the implementation of a very large number of modifications (several hundred in total). It will not be possible to implement all of these modifications during the ten-yearly outages. Therefore, ASNR’s decision draws a distinction between modifications that are considered a priority and must be implemented during the ten-yearly outages, and those that it will be possible to implement at a later date. 22 • Les cahiers de l’ASNR • July 2025
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