Belleville‑sur‑Loire nuclear power plant The Belleville-sur-Loire NPP is situated in the north-east of the Cher département, on the left bank of the river Loire, at the crossroads of four départements (Cher, Loiret, Nièvre and Yonne) and two administrative regions (Bourgogne‑Franche‑Comté and Centre‑Val de Loire). The NPP has two 1,300 Megawatts electric (MWe) reactors commissioned in 1987 and 1988, which constitute Basic Nuclear Installations (BNIs) 127 and 128 respectively. ASNR considers that the performance of the Belleville-sur‑Loire NPP is in line with the general assessment of EDF nuclear plant performance in the areas of nuclear safety, radiation protection and protection of the environment. From the nuclear safety aspect, ASNR considers that with regard to management of the facilities, operational rigour in the control room was maintained at a satisfactory level. Progress has also been made in the management of circuit configurations. However, the management of unplanned reactor shutdowns needs to be improved. In terms of facility maintenance, the NPP’s performance has deteriorated compared with previous years. A number of shortcomings were noted in the preparation of activities, and defects in the performance of maintenance activities were detected on equipment important to safety. A maintenance fault led to the automatic shutdown of a reactor and major damage to the condenser. ASNR expects the site to take full account of the operational experience feedback from these events and implement appropriate actions to improve control of maintenance activities in 2026. ASNR considers that the radiation protection performance of the Belleville-sur-Loire NPP remains stable. The controls carried out, particularly during reactor shutdowns, showed that the action plan to reinforce the fundamentals of radiation protection was being properly implemented. In addition, EDF successfully managed an event with a serious radiological risk, which resulted in a spill of radioactive resins in a room following a circuit configuration error. With regard to environmental protection, effluent management and the monitoring of discharges are deemed satisfactory. ASNR positively highlights that the national strategy for managing the containment of liquid effluents is being applied correctly, and that the first work to renovate the demineralised water production plant has been completed, and will continue until 2026. On the other hand, improvements are expected in the operation of the new facility designed to treat legionella and amoebae. Its commissioning did not prevent the regulatory thresholds for the presence of legionella from being exceeded in 2025. With regard to occupational safety, based on the inspections it carried out concerning the management of mandatory inspections of electrical installations and lifting equipment and accessories, ASNR considers that the action plans implemented by the site must continue in order to correct the identified non-conformities. Dampierre‑en‑Burly nuclear power plant The Dampierre-en-Burly NPP is situated on the right bank of the Loire river, in the Loiret département, about 10 km downstream of the town of Gien and 45 km upstream of Orléans. It comprises four 900 MWe nuclear reactors which were commissioned in 1980 and 1981. Reactors 1 and 2 constitute BNI 84, and reactors 3 and 4 BNI 85. The site accommodates one of the regional bases of the Nuclear Rapid Intervention Force (FARN), the special emergency response force created by EDF in 2011 following the Fukushima Daiichi NPP accident (Japan). Its role is to intervene in pre-accident or accident situations, on any NPP in France, by providing additional human resources and emergency equipment. Centre‑Val de Loire The Orléans division regulates nuclear safety, radiation protection and the transport of radioactive substances in the 6 départements of the Centre-Val de Loire region. In 2025, ASNR carried out 160 inspections in the Centre‑Val de Loire region, including 108 of nuclear installations at EDF sites in Belleville‑sur‑Loire, Chinon, Dampierre‑en‑Burly and Saint‑Laurent‑des‑Eaux, 39 in small-scale nuclear activities, 7 on the subject of radioactive substance transport and 6 concerning approved bodies or laboratories. ASNR also carried out 26 days of labour inspections in the four Nuclear Power Plants (NPPs) of the region. In 2025, ASNR was notified of 11 significant events rated level 1 and one event rated level 2 on the International Nuclear and Radiological Events Scale (INES scale). 160 inspections 12 significant events on a level greater than or equal to 1 on the INES scale 1 significant event of level 2 or higher on the ASN-SFRO scale 50 ABSTRACTS – ASNR Report on the state of nuclear safety and radiation protection in France in 2025
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