Substantial work carried out according to a set schedule PROVISIONAL SCHEDULE OF THE TEN-YEARLY OUTAGES 2026 • Paluel 1 2027 • Cattenom 1 • Paluel 2 and 3 • Saint-Alban 1 2028 • Cattenom 2 • Flamanville 1 • Saint-Alban 2 2029 • Belleville 2 • Flamanville 2 • Nogent 1 • Paluel 4 2030 • Belleville 1 • Nogent 2 2031 • Cattenom 3 • Penly 1 2032 • Golfech 1 2033 • Cattenom 4 2034 • Golfech 2 • Penly 2 The fourth ten-yearly outages for the 1,300 MWe reactors have been scheduled by EDF to take place between 2026 and 2034, with the associated periodic safety review concluding reports to be submitted between 2027 and 2035. The schedule for the fourth periodic safety reviews of the 1,300 MWe reactors is based on the date of the previous periodic safety review of each reactor. Reactors 1 and 2 at Paluel nuclear power plant and reactor 1 at Cattenom nuclear power plant were the first to undergo their third periodic safety review. Therefore, they will be the first to undergo the fourth periodic safety review, ten years later. A substantial programme of industrial activity from 2026 onwards A large proportion of the works planned within the scope of the periodic safety review will be carried out by EDF during the ten-yearly outages prior to the submission of the periodic safety review concluding reports. Three 1,300 MWe reactors will submit their periodic safety review concluding reports in 2027. Consequently, a significant number of ten-yearly outage inspections will be carried out on the 1,300 MWe reactors at the start of the specific phase. This situation requires EDF to be very well prepared right from the start of this phase. Works schedule validated by ASN in 2023 Owing to their scale, it will not be possible to implement all of the works during these ten-yearly outage inspections. Therefore, as was the case with the 900 MWe reactors, the improvements will be spread over time by splitting them into two phases of modifications. This means that some of the work will be carried out several years after the ten-yearly outage inspections. In order to ensure that the improvements most important for safety are made as early as possible, ASN issued a position statement in 2023 regarding the work to be done during the ten-yearly outage inspections. This works schedule will be the same for all 1,300 MWe reactors and as such constitutes a guarantee of success for their implementation. It takes account of the ability of industrial providers to carry out the work to the expected level of quality, as well as the related training required for operators to become familiar with these modifications. SUBSTANTIAL WORK ASSOCIATED WITH THE PERIODIC SAFETY REVIEW As part of the fourth periodic safety review, EDF plans to carry out substantial work aimed at improving accident management and making reactors more resilient to hazards. New safety systems will be installed, in particular the following : • An ultimate containment cooling system, to remove heat from the reactor building in the event of a core melt accident; • A system for distributing water from the ultimate water source to supply the steam generators and the spent fuel pool . • A corium* stabilisation device designed to prevent melt-through of the bottom of the reactor containment in the event of a core meltdown accident. Fourth periodic SAFETY REVIEW 6 • Les cahiers de l’ASNR • July 2025
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