Auvergne‑Rhône‑Alpes will also remain vigilant to ensure that the developments and studies required for constructing the future unit for decommissioning the diffusers continue. Georges Besse II enrichment plant The Georges Besse II (GB II) plant, which constitutes BNI 168, has been the site’s enrichment facility since the Georges Besse I plant was shut down. It separates uranium isotopes using the centrifugation process. The standard of safety of the plant’s facilities in 2025 was satisfactory. However, ASNR noted that the cylinder handling radiation portal monitors at the South plant were subject to the same type of difficulties as at the North plant. The technologies used in the facility enable high standards of safety, radiation protection and environmental protection to be achieved. The loss of refrigerants into the atmosphere remains a subject of attention, and ASNR carried out a dedicated inspection in 2025, which showed that the provisions of the European regulation amended on 7 February 2024 had yet to be applied definitively. In 2022, Orano began the project to extend the GB II North enrichment plant in order to increase its production capacities by adding centrifuge modules. The GB II North plant extension project underwent a prior consultation from 1 February to 9 April 2023, organised by the National Commission for Public Debate (CNDP). In June 2023, Orano submitted the substantial modification application file in order to build this extension. This extension project underwent a public inquiry in April 2024 and construction work began in September 2024. ASNR is examining various modification dossiers in connection with this project and in 2025 carried out two on-site inspections, which proved satisfactory. Maintenance, effluent reprocessing and waste packaging facilities The effluent treatment and uranium recovery facility (IARU), which constitutes BNI 138, ensures the treatment of liquid effluents and waste, as well as maintenance operations for various BNIs. The level of safety in the BNI’s various units in 2025 was satisfactory. Fire risk prevention continues to progress in line with the action plan drawn up following the periodic safety review. Orano is planning major changes to the reprocessing of effluent flows at the Tricastin platform, and has provided ASNR with DOS for these projects, which will ultimately result in more efficient facilities with improved safety standards. The periodic safety review of BNI 138 obliged Orano to consider creating new units for certain effluent reprocessing steps given the technical/economic impossibility of reinforcing or improving the existing facilities. ASNR has examined the DOS and will continue to monitor the progress of these projects, especially as the first modification dossier, initially expected at the end of 2025, has been delayed by several months. Atrium (Tricastin uranium-bearing materials storage facility) Following the delicensing of part of the Pierrelatte DBNI by decision of the Prime Minister, the Tricastin uranium-bearing materials storage yards (BNI 178) were created. This installation groups the uranium storage yards and the platform’s new emergency management premises. Following on from this delicensing process, facility “P35” (BNI 179) was created. It comprises ten uranium storage buildings. An additional storage area called “FLEUR” was authorised by a Decree of 18 March 2022. Commissioning of this new BNI (BNI 180) was authorised by ASN resolution 2023-DC-0750 of 3 January 2023. Four Decrees of 24 July 2025 modified the perimeters of BNIs 93, 138 and 155 and combined BNIs 178, 179 and 180, BNI 155’s P18 storage yard and BNI 93’s permanent storage yards into a single BNI called “Atrium” (BNI 178-U). ASNR considers that the level of safety of the storage areas in 2025 was satisfactory. In 2025, there were a number of regulatory changes in these areas. Decree 2025-689 of 24 July 2025 authorised the creation of BNI 178-U, known as “Atrium”, bringing together facilities that were previously spread across several BNIs. In mid-2023, Orano started work on the AMC2 project which consists in adding a new facility for washing and rinsing containers dedicated to the transport of UF6. This facility will replace the existing AMC which is situated in the DBNI. The creation of AMC2 was authorised by Decree 2023-1220 of 19 December 2023, and ASNR monitored the completion of the project and authorised commissioning under ASNR resolution 2025-DC-026 of 27 November 2025. In addition, effluent discharges from BNI 178-U are governed by ASNR resolutions 2025DC-022 and 2025-DC-023 of 21 October 2025 (discharge terms and limits). In January 2023, Orano was authorised by ASN to commission the first two buildings of the reprocessed uranium storage facility, known as “FLEUR”. In December 2024, the construction of the other two buildings was authorised by ASN. An inspection of the site in 2025 revealed satisfactory practices. ABSTRACTS – ASNR Report on the state of nuclear safety and radiation protection in France in 2025 43
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