Les cahiers de l’ASN #02 - Conditions for the continued operation of EDF’s 900MWe reactors

The periodic safety reviews schedule The 4 th periodic safety reviews of the 900MWe reactors are scheduled by EDF to run between 2020 and 2031. T he 900MWe reactors were put into service between 1977 and 1987 . The 4 th periodic safety review of each reactor will take place 10 years after its 3 rd safety review. However, it does not always take place in the fortieth year of reactor operation on account of the time lags resulting from the first reviews. THE PERIODIC SAFETY REVIEWS SCHEDULE UNTIL 2031 2020 • Tricastin 1 2021 • Bugey2 • Bugey4 • Tricastin2 2022 • Bugey5 • Blayais 1 • Dampierre 1 • Gravelines 1 • Dampierre2 2023 • Gravelines3 • Tricastin3 2024 • Bugey3 • Blayais2 • Dampierre3 • Gravelines2 • ChinonB1 • Gravelines4 • Saint-LaurentB2 2025 • Tricastin4 • Dampierre4 • Saint-LaurentB1 • Cruas3 2026 • Blayais3 • Blayais4 • Cruas 1 2027 • Gravelines5 • ChinonB2 • Cruas4 2029 • Cruas2 2030 • ChinonB3 • Gravelines6 2031 • ChinonB4 Reactor 1 of the Tricastin nuclear power plant (NPP) was the first to undergo its 3 rd periodic safety review, therefore it was the first reactor to undergo its 4 th periodic safety review, which took place in 2020. The 10-year frequency for the periodic safety reviews of nuclear facilities was introduced by the Act on transparency and security in the nuclear field (“TSN” Act) of 2006. All basic nuclear installations (BNI) on French territory are subject to this regulatory requirement. WHAT THE LAW SAYS Ten-yearly outage: Long reactor outage (about 6 months) during which the licensee carries out checks and modifications in order to reinforce the level of safety. The ten-yearly outage is one step in the periodic safety review leading to the submission of a concluding report to ASN. 4 • Les cahiers de l’ASN • February 2021 4 TH PERIODIC SAFETY REVIEW OF THE 900MW e REACTORS