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 for 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 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 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. In late 2021, the CEA announced a radical change in the decommissioning strategy of BNI 40 with the postponement of commissioning of the equipment for treating and packaging irradiating waste. For the purpose of the examination, further information on the new decommissioning scenario, particularly regarding the management of irradiating waste, had to be provided. The CEA submitted a new decommissioning file at the end of 2023 and it is currently being examined. 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 regional division regulates nuclear safety in the Basic Nuclear Installations (BNIs) of this region. 240 inspections 11 significant events rated level 1 or higher ASN carried out 240 inspections in the Ile-de-France region in 2024, of which 90 were in the field of nuclear safety, 127 in small-scale nuclear activities (four of them in the area of polluted sites and soils), 14 in Radioactive Substance Transport (TSR) and nine concerning approved organisations or laboratories. Seven significant events were rated level 1 on the International Nuclear and Radiological Events Scale (INES) in the small-scale nuclear activities sector, three at level 1 on the INES scale in the BNIs sector and one at level 1 on the INES scale in the area of TSR. Lastly, pursuant to Article 40 of the Penal Procedure Code, a report was filed against an inspection agency for falsification of documents. 64 ABSTRACTS – ASN Report on the state of nuclear safety and radiation protection in France in 2024
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