LES ACTIVITÉS NUCLÉAIRES : RAYONNEMENTS IONISANTS ET RISQUES POUR LA SANTÉ ET L’ENVIRONNEMENT 2.2 Organisation in the event of a major accident Since its creation in January 2025, ASNR has set up a unified emergency organisation designed to deal with a major accident, bringing together teams from both ASN and IRSN. This organisation relies on: ∙the participation of ASNR personnel in the various CIC units; ∙the creation of a national Emergency Response Centre based in Fontenay-aux-Roses (Île-de-France), structured around an emergency director, supported by a director in charge of expertise and supported by several specialised units: ‒an “information and support” unit responsible for logistical support and information management; ‒an “installation status” unit responsible for analysing and assessing the current event; ‒a “consequence assessment” unit responsible for analysing environmental impacts, interpreting field measurements and proposing measures to protect people; ‒a “health impact assessment” unit dedicated to assessing health impacts, interpreting field data and formulating health monitoring measures for populations; ‒a “communication” unit; ‒an “international relations” unit; The operational effectiveness of the Emergency Response Centre is regularly tested during national emergency exercises. The Centre is activated in the event of incidents or accidents. At the local level, ASNR representatives visit the département and zone Prefects to help them with their decisions and their communication actions. ASNR inspectors may also go to the site affected; others help with emergency management at the headquarters of the regional division involved. In 2025, the ASNR Emergency Response Centre was called upon 17 times for 9 national exercises, 2 international exercises and 6 real-life situations. In addition to these events, ASNR took part in several local exercises with the various operators (EDF, CEA, Orano) in order to train its emergency response expertise teams and to help adjust the new organisation of the Emergency Response Centre. The ASNR emergency organisation was called on several times in 2025, following triggering of the PUI at nuclear installations. In 2025, four NPPs triggered their PUI for a fire outside a controlled zone, i.e. in an area containing no radioactive substances: on 28 January at Chinon NPP (vehicle fire in the plant car park), on 29 May at Bugey NPP (fire in an administrative building), on 6 June at Dampierre-en-Burly NPP (fire in the turbine of reactor 3) and on 20 December at Chooz NPP (fire in the turbine of reactor 1). For each of these situations, ASNR’s emergency organisation was mobilised and the Emergency Response Centre partially mobilised to monitor the situation. These four situations were rapidly brought under control by the EDF teams, leading to no consequences for the safety of the installations. In addition, on 20 November 2025, CEA Fontenay-aux-Roses triggered its PUI following a fire in a room at a facility being decommissioned. One person present in the room where the fire started was slightly injured and contaminated. ASNR mobilised its teams at the Fontenay-aux-Roses Emergency Response Centre to assess the situation and the associated risks. A mobile unit was also sent to the site to measure radioactivity near the site, which confirmed that there had been no release. These five situations had a limited impact inside the installations and required no population protection measures. Each time, ASNR authorised lifting of the PUI a few hours after it was triggered. In addition, on 22 March, the Flamanville NPP implemented a specific organisation following the detection of a leak in a small-diameter pipe connected to the primary circuit on 22 March, without the PUI trigger criteria being fulfilled. Responding reactively, the NPP applied the established instructions and informed ASNR’s on-call team, which partially mobilised its emergency organisation to monitor the event. This had no impact on the environment. DIAGRAM 2 The role of ASNR in a nuclear emergency situation Licensee COS ASNR measurement unit Public information Information International assistance ASNR inspector ASNR mobile unit Media Stakeholders (CLI, HCTISN, etc.) Define and participate in environmental monitoring and people control CIC Government Prefect COD COZ ASNR representatives Embassy IAEA – EU Other countries ASNR + Emergency Response Centre + Communication unit Oversight Inspections Requirements Population protection recommendations based on expertise ASNR representatives ASNR representative CIC: Interministerial Crisis Committee – CICNR: Interministerial Committee for Nuclear or Radiological Crises – CLI: Local Information Committee – COD: Departmental Operations Centre – COS: Emergency Operations Commander - COZ: Zone Operations Centre – HCTISN: High Committee for Transparency and Information on Nuclear Safety 184 ASNR Report on the state of nuclear safety and radiation protection in France in 2025
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