BRENNILIS NUCLEAR POWER PLANT The Brennilis NPP is situated in the Finistère département, on the Monts d’Arrée site 55 km north of Quimper. Baptised “EL4-D”, this installation (BNI 162) is an industrial electricity production prototype (70 Megawatt electric – MWe), moderated with heavy water and cooled with carbon dioxide, and it was definitively shut down in 1985. Decree 2011-886 of 27 July 2011 authorised the NPP decommissioning operations, with the exception of the reactor block. In July 2018, EDF submitted an application file for the complete decommissioning of its facilities, and this file was subject to a technical review followed by a public inquiry from 15 November 2021 to 3 January 2022. Decree 2023-0898 of 26 September 2023, published on 28 September 2023, requires EDF to completely decommission BNI 162 and amends Decree 96-978 of 31 October 1996 authorising the creation of this facility. ASN issued the authorisations to implement the general operating rules and the on-site emergency plan for complete decommissioning in June 2024. During 2024, ASN also continued updating of the resolutions regulating the plant’s water discharges and intakes which were published on 21 November 2024. Consequently, in 2024, ASN issued all the authorisations necessary for deployment of the complete decommissioning operations. During the same year, EDF continued its preparatory work for complete decommissioning, including in particular civil engineering adaptations in preparation for decommissioning of the peripheral systems, planned as of 2025. Bretagne The Nantes division regulates radiation protection and the transport of radioactive substances in the 4 départements of the Bretagne region. The Caen division regulates the nuclear safety of the Brennilis Nuclear Power Plant (NPP), currently undergoing decommissioning. 61 inspections 1 significant event rated level 1 or higher In 2024, ASN carried out 61 inspections, three at the Monts d’Arrée NPP currently being decommissioned, 13 in the transport of radioactive substances and 41 in small-scale nuclear activities (21 in the medical sector, 20 in the industrial, veterinary and research sectors) and four concerning natural radioactivity (radon). In 2024, one significant event in the veterinary sector was rated level 1 on the International Nuclear and Radiological Event Scale (INES scale). The failure of an electrical device emitting ionising radiation resulted in a worker being exposed to more than a quarter of the annual regulatory limit. Lastly, in the course of their inspection duties the ASN inspectors issued one violation report to a company for taking radon measurements without the requisite approval. The installations and activities to regulate comprise: • one Basic Nuclear Installation: • the Monts d’Arrée (Brennilis) NPP, undergoing decommissioning; • small-scale nuclear activities in the medical sector: • 9 external-beam radiotherapy departments, • 5 brachytherapy departments, • 11 nuclear medicine departments, • 36 centres practising fluoroscopy-guided interventional procedures, • 63 computed tomography scanners for diagnostic purposes, • some 2,500 medical and dental radiology devices; • small-scale nuclear activities in the industrial, veterinary and research sectors: • 1 cyclotron, • 15 industrial radiography companies, including 3 performing gamma radiography, • 23 research units, • about 400 users of industrial, veterinary and research devices; • activities associated with the transport of radioactive substances; • ASN-approved organisations and laboratories: • 8 organisations approved for measuring radon, • 3 head-offices of a laboratory approved for environmental radioactivity measurements. Chapter 7 Chapter 8 Chapter 9 48 ABSTRACTS – ASN Report on the state of nuclear safety and radiation protection in France in 2024
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