ASNR’s decision on the generic phase of the fourth periodic safety review ASNR’s decision of 1 July 2025 concludes the generic phase of the fourth periodic safety review of the 1,300 MWe reactors. The decision defines the conditions (common to all of the 1,300 MWe reactors) that EDF will be required to meet in order to continue operating the reactors beyond 40 years. It provides the framework for rolling out the modifications to the facilities, which will kick off in early 2026 with the fourth ten-yearly outage inspection of reactor 1 at the Paluel nuclear power plant. An ambitious review designed to improve reactor safety, modelled on the periodic safety review of the 900 MWe reactors Ambitious objectives, similar to those adopted for the 900 MWe reactors, have been established for this fourth periodic safety review of the 1,300 MWe reactors, and ASNR wishes to underline the magnitude of the studies carried out by EDF during the generic phase. These studies have enabled EDF to identify numerous modifications to the facilities that will be required to improve reactor safety. ASNR’s requirements for rolling out the periodic safety review on each reactor ASNR has set out the requirements governing the rollout of the most important modifications and the additional studies necessary to ensure that the objectives are met. As was the case for the 900 MWe reactors, ASNR requires EDF to provide an annual report on the actions taken to meet the requirements and their associated deadlines, and on the industrial capacity of EDF and its nuclear industry partners to implement the modifications to the facilities within the set timeframes. ASNR asks that this information be made public. ASNR will perform inspections during EDF’s checks on each of the reactors and during the rollout of the modifications, particularly during the ten-yearly outages. ASNR’S DECISION AND REQUIREMENTS 10 • Les cahiers de l’ASNR • July 2025
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