Île‑de‑France The Paris division regulates radiation protection and the transport of radioactive substances in the 8 départements of the Île-de-France region. The Orléans division regulates nuclear safety in the Basic Nuclear Installations (BNIs) of this region. In 2025, ASNR carried out 279 inspections in the Île‑de‑France region, including 110 in the field of nuclear safety, 144 in the field of small-scale nuclear activities (including 4 in the field of polluted sites and soils), 19 on the theme of the Radioactive Substance Transport (RST) and 6 concerning approved bodies or laboratories. Eleven significant events were rated level 1 on the International Nuclear and Radiological Events Scale (INES scale) in the small-scale nuclear activities sector, 2 at level 1 on the INES scale in the BNIs sector and 2 at level 1 on the INES scale in the area of RST. An event concerning the Centre for Research and Restoration of Museums of France (C2RMF) was classified at level 3 of the INES scale following the irradiation of a worker’s arm by a particle accelerator which resulted in skin lesions characteristic of deterministic effects. In addition, 2 penalty notices were issued against a nuclear activity manager and 3 contradictory reports prior to formal notice were sent. Finally, a formal notice was published concerning Hôpital Privé Paul d’Égine. 279 inspections 16 significant events on a level greater than or equal to 1 on the INES scale 0 significant event of level 2 or higher on the ASN-SFRO scale CEA Saclay site Since 2017, the Alternative Energies and Atomic Energy Commission (CEA) Paris‑Saclay centre accommodates activities previously conducted on several geographically distinct sites close to Paris, and the sites of Saclay and Fontenayaux‑Roses in particular. The CEA Paris-Saclay centre, of which the main site covers an area of 125 hectares, is situated about 20 km southwest of Paris, in the Essonne département. About 6,000 people work there. Since 2005, this centre has been primarily devoted to physical sciences, fundamental research and applied research. The applications concern physics, metallurgy, electronics, biology, climatology, simulation, chemistry and the environment. The main aim of applied nuclear research is to optimise the operation and enhance the safety of the French NPPs. Seven BNIs are located on this site. Nearby are also located an office of the French National Institute of Nuclear Science and Technology (INSTN) – a training institute – and two industrial firms: Technicatome, which designs nuclear reactors for naval propulsion, and CIS bio international, which produces radiopharmaceuticals for nuclear medicine. THE INDUSTRIAL AND RESEARCH FACILITIES Osiris and Isis reactors The Osiris pool-type reactor, which has an authorised power of 70 Megawatts thermal (MWth), was primarily intended for technological irradiation of structural materials and fuels for various nuclear power reactor technologies. Another of its functions was to produce radionuclides for medical purposes. Its critical mock-up, the Isis reactor with a power of 700 kilowatts thermal (kWth), was essentially used for training purposes. These two reactors were authorised by a Decree of 8 June 1965 and constitute BNI 40. Given the old design of this facility by comparison with the best available techniques for protection against external hazards and for the containment of materials in the event of an accident, the Osiris reactor was shut down at the end of 2015. The Isis reactor was definitively shut down in March 2019. Following submission of the decommissioning file for the entire facility in October 2018, ASN requested and received additional information giving more details on the operations planned at each stage of decommissioning and substantiating more precisely the initial state envisaged at the start of decommissioning and the results of the impact assessment. 64 ABSTRACTS – ASNR Report on the state of nuclear safety and radiation protection in France in 2025
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