What new measures is EDF planning ? The general approach to reviewing the risks associated with hazards comprises the following steps: • Re-assessment of the levels of hazard to be considered, in light of experience gained and advancements in knowledge, particularly with regard to climate change ; • Examination of the suitability of existing protection measures to handle such levels of hazard and, where applicable, identification of improvements to be made to the facilities ; EDF has re-assessed the safety of its reactors with respect to the risks associated with the different types of hazards likely to affect the facilities. The studies carried out have enabled numerous modifications to be identified that will enhance the safety of the reactors. The climate-related hazards taken into account include the consequences of climate change in light of available knowledge. In addition, EDF is setting up a monitoring system to track the development of these risks, and to collect data on heatwaves and rising sea levels in particular. This periodic safety review also provides the opportunity to complete the rollout of the “hardened safety core”* in line with the safety provisions prescribed by ASN in 2012 following the accident at the Fukushima nuclear power plant. These provisions will make it possible to withstand certain extreme events (earthquakes, floods, etc.) of a higher level of intensity than those experienced to date. ASNR wishes to underline the substantial work carried out by EDF to update all of the internal and external hazard studies. The methods used by EDF to define the hazard levels are acceptable. The modifications resulting from these studies constitute a significant improvement in the management of risks associated with hazards, and will enable the objectives of the periodic safety review to be achieved. ASNR has issued requirements governing the rollout of certain modifications in view of the associated implications which are particularly significant. These requirements relate in particular to: • temperature levels to be taken into account for heatwaves, • modifications required to limit fire-related risks, • identification of key valves for managing internal flooding situations, • the level of extreme earthquakes that the «hardened safety core» must be able to withstand. The ASNR’s decision Conditions for the continued operation of 1,300 MWe reactors beyond 40 years • 15
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