ASN continued its monitoring of the construction of the Flamanville EPR reactor. In 2020 and 2021, it was particularly vigilant regarding the processing of the anomalies detected on the main primary and secondary system welds and the continuation of the reactor start-up tests. ASN also authorised partial commissioning of the installation to allow nuclear fuel to enter the site, starting on 26 October 2020 and ending on 24 June 2021. A look back at these notable events.