Assessment of the Fontenay‑aux‑Roses CEA site ASNR considers that the level of safety at CEA in Fontenay-aux-Roses is acceptable. CEA must nevertheless maintain its efforts to ensure the operational safety of its facilities. After delays identified in the preceding years in the performance of the studies, in project programming and in the decommissioning schedule of the nuclear installations of Fontenay‑aux‑Roses, two of CEA’s major decommissioning-related worksites were stopped for contractual and technical reasons in 2023. This situation led to technical changes in the choice of equipment design and pushing back of the decommissioning time frames. CEA must be particularly vigilant regarding the coordination of the files and the work planned on the site in order to reduce the dispersible radiological inventory within the facilities. The licensee must also continue to implement strong measures to control and render reliable the project time frames, particularly the deadlines for submission of the decommissioning worksite preparatory studies. In 2023, in view of the conclusions of the periodic safety review of BNI 165, ASN regulated its continued operation through a resolution setting technical requirements. With regard to BNI 166, in view of CEA’s commitments and the action plan established at the end of the periodic safety review and further to its examination of the concluding report of the said review, ASN considered in 2024 that it had no objection to the continued operation of BNI 166. In 2025, ASNR monitored the progress of the action plans resulting from these two reviews. ASNR positively highlights CEA’s involvement in updating all the general operating rules, which have been obsolete for several years, and urges it to continue this work in 2026. However, improvements are still needed in terms of emergency response resources. The updated On-site Emergency Plan (PUI), submitted by CEA at the end of 2025, is currently being examined. Furthermore, ASNR considers that the actions undertaken by CEA to control the risk of fire must be continued in order to achieve the expected level of safety. In this respect, in order to provide a framework for the qualification of the new fire extinguishing system for the shielded process lines at BNI 165, ASNR issued a resolution on 30 September 2025 requiring certain activities to be carried out, and will be monitoring compliance with the associated deadlines. Finally, the management of historical waste is a major point of vigilance for ASNR, with two significant events reported in connection with this issue in 2025. Waste with radiological activity well above the maximum limit set in the storage room, which had since been transferred to a suitable storage site, was discovered. In addition, a fire broke out while waste was being handled, triggering the PUI at the CEA Fontenay-auxRoses site and activating ASNR emergency response centre. Although this event did not have any impact on the public or the environment, ASNR expects CEA to learn all it can from it and adapt the way it carries out its work accordingly. deviations in the latest filtration levels in the facility’s ventilation system, and to implement corrective actions. Thus, the facility’s results in the areas of safety and radiation protection are mixed. Despite the substantial work undertaken by the facility’s staff at all levels of the organisation and the improvements observed in safety management, CIS bio international must continue its efforts to achieve a significant improvement. Operating rigour, maintaining the safety culture and the oversight of industrial projects or aiming to improve safety or radiation protection remain the areas in which CIS bio international must focus its efforts. The numerous projects, studies and works undertaken by CIS bio international still require particular attention as well as better scheduling so that the files to be addressed to ASNR can be prepared and submitted sufficiently early. In order to improve performance in terms of safety, radiation protection and the environment, the licensee must maintain increased vigilance over the organisation and technical resources implemented. Fontenay‑aux‑Roses CEA site Created in 1946 as CEA’s first research centre, the Fontenay-aux-Roses site is continuing its transition from nuclear activities towards research activities in living sciences. The CEA Fontenay‑aux‑Roses site, part of the CEA Paris‑Saclay centre since 2017, comprises two BNIs, namely Procédé (BNI 165) and Support (BNI 166). BNI 165 accommodated the research and development activities on nuclear fuel reprocessing, transuranium elements, radioactive waste and the examination of irradiated fuels. These activities ceased in the 1980s-1990s. BNI 166 is a facility for the characterisation, treatment, reconditioning and storage of legacy radioactive waste from the decommissioning of BNI 165. Broadly speaking, CEA’s decommissioning and waste management strategy has been examined by ASN, which stated its position in May 2019 on the priorities defined by CEA (see chapters 12 and 13 of the full ASNR Report). An update of this strategy, taking into account operating experience feedback, is expected by ASNR. Decommissioning of the Fontenay‑aux‑Roses site includes priority operations because it presents particular risks, linked firstly to the quantity of radioactive waste present in the facilities, and secondly to the radiological contamination of the soils under part of one of the BNI 165 buildings. In addition to this, the Fontenay‑aux‑Roses centre, which is situated in a densely-populated urban area, is engaged in an overall delicensing process. Procédé and Support facilities Decommissioning of the two facilities Procédé and Support, which constitute BNI 165 and BNI 166 respectively, was authorised by two Decrees of 30 June 2006. The initial planned duration of the decommissioning operations was about ten years. The CEA informed ASN that, due to strong presumptions of radioactive contamination beneath one of the buildings, as well as unforeseen difficulties and a change in the overall decommissioning strategy of the CEA’s civil centres, the decommissioning operations had to be extended and that the decommissioning plan would be modified. In June 2015, CEA submitted an application to modify the prescribed deadlines for these decommissioning operations. ASN deemed that the first versions of these Decommissioning Decree modification application files were not admissible. In accordance with the commitments made in 2017, CEA submitted the revised versions of these files in 2018. These files were supplemented over the 2019‑2022 period, particularly with respect to the planned decommissioning operations and their schedule. The CEA forecasts end of decommissioning of the BNIs beyond 2060. These two projects are currently being assessed. The new decrees will set the decommissioning characteristics to come, notably their completion time frame. Île‑de‑France ABSTRACTS – ASNR Report on the state of nuclear safety and radiation protection in France in 2025 69
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