Bretagne 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 three performing gamma radiography, • 23 research units, • about 400 users of industrial, veterinary and research devices; ▸ activities associated with the transport of radioactive substances; ▸ ASNR-approved laboratories and organisations: • 8 organisations approved for measuring radon, • 3 head-offices of a laboratory approved for environmental radioactivity measurements. Chap.7 Chap 6 Chap.5 ASNR actions to prevent radon risk Oversight actions ASNR carried out an inspection of the town of Lanester in Morbihan (56) with regard to radon risk management in certain Public Access Buildings (PABs). This local authority’s radon risk management is very satisfactory. However, there is still room for improvement in terms of informing the public of the results of radon measurements, by displaying them at the entrances to the premises concerned. Radon risk is now an integral part of the specifications for all works projects involving ventilation and/or airtightness issues. ASNR also carried out an inspection at an establishment with a designated radon-risk workplace: the Guerlédan dam in Côtes-d’Armor (22), operated by EDF Petite Hydro. Initiated in 2019, the process of assessing the risk of radon exposure for workers and contractors is now in place, and has been supplemented by measurements of radon concentrations carried out during three campaigns in the dam’s two underground drifts. Measurements were also taken on premises in the basement, on the ground floor and on the upper floors. Awareness-raising actions ASNR supports, as part of the 4th regional health and environment plan (PRSE 4) for the Bretagne region, an initiative to help private individuals from several communities in carrying out voluntary radon measurement campaigns in housing. This initiative is run by the Approche Eco Habitat association. – Co-financed by ARS Bretagne; – Operational experience feedback on a communication support tool for organisations supporting the implementation of radon awareness and measurement campaigns in housing, disseminated in 2024. This material was also distributed to the regional branch of the Gendarmerie nationale based in Rennes. ASNR also responds to numerous requests from private individuals and employers to manage the risk of radon exposure in homes and workplaces. Lastly, ASNR co-hosted an information webinar for public building owners and employers on 7 November 2025, as part of European Radon Day, in conjunction with the Regional Health Agency (ARS) and the Regional Directorate for the Economy, Employment, Labour and Solidarity (Dreets) in Bretagne. Areas with radon potential in mainland France, and particularly in Bretagne, are shown on page 99. ABSTRACTS – ASNR Report on the state of nuclear safety and radiation protection in France in 2025 49 86 Rn radon
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