ASN Report 2022

The labour inspections on the themes of “worksite coordination” and “lockout/tagout and verification of electrical systems” revealed no major findings. Progress was observed in worksite coordination. The results of these inspections are satisfactory and the interchanges with the site are constructive. More generally, ASN considers that the licensee is progressing in the various areas inspected and notes a strengthening of the teams which promotes a dynamic of progress. Fessenheim nuclear power plant The Fessenheim NPP comprises two PWRs, each with a unit power of 900 MWe. It is situated 1.5 km from the German border and about 30 km from Switzerland. The two reactors, which were commissioned in 1977 and definitively shut down in 2020, are currently undergoing preparation for decommissioning. ASN considers that the site has maintained a robust level of conscientiousness and vigour in the monitoring of operation of the facilities, despite a significantly different level of operating and maintenance activities. Nevertheless, a better adaptation of the site’s past practices to the changing context would give a better quality in both operation and performance of the activities. The year 2022 was essentially taken up by the continuation of the decommissioning preparation activities, such as the preparation, installation and execution of the decontamination work on reactor 1, the installation of new resin storage capacities, the removal of large quantities of waste and continuation of boron treatment and removal. The decontamination of the primary system turned out to be much more complicated than EDF had expected, resulting in delays in execution. Major milestones have been reached, such as the finalisation of fuel removal. Several major work sites will be continuing in 2023, notably with the decontamination of the primary system of the second reactor and the creation, in the turbine hall, of the facility for managing the waste resulting from the decommissioning. With regard to radiation protection, 2022 saw a drop in the number of reported events compared with the preceding years and confirmation of the improvement in the prevention of contamination of the site roads. Nevertheless, some shortcomings persist in the radiation protection culture of certain workers (excess dose alarms, radiation protection marking out) and the management of sources and the associated removal actions were not considered satisfactory. Nogent-sur-Seine nuclear power plant Operated by EDF and situated in the municipality of Nogent‑sur‑Seine in the Aube département, 70 km northwest of Troyes, the Nogent‑sur‑Seine NPP comprises two PWRs each of 1,300 MWe, commissioned in 1987 and 1988. Reactor 1 constitutes BNI 129 and reactor 2 BNI 130. ASN considers that the performance of the Nogent-sur-Seine NPP in the areas of safety, radiation protection and the environment are in line with ASN’s general assessment of the EDF NPPs. In the field of nuclear safety, ASN considers the results to be satisfactory on the whole, except as concerns system configuring and equipment lockout/tagouts, which were the cause of a large portion of the significant events involving operational management of the reactors. Progress is expected in this area. The licensee must also continue its efforts to maintain adequate staffing of the independent safety organisation. The maintenance operations during the reactor 1 outage went satisfactorily on the whole. As far as occupational radiation protection is concerned, ASN observes better management of worksite radiological cleanliness and a reduction in the number of internal exposures of workers. However, deficiencies in the radiation protection culture and rigour of the workers were again noted on several occasions, particularly concerning the conditions of access to controlled areas. The licensee must remain particularly vigilant on this subject, as it must with the management of industrial radiography work, which has shown some weaknesses. With regard to protection of the environment, ASN considers that the licensee’s organisation is satisfactory. Nevertheless, the condition of some installations, particularly regarding the injection of sulphuric acid into the secondary system, requires priority action on the part of the licensee. The labour inspections revealed nonconformities in the work equipment, particularly with respect to prevention of the risk of falling or of electrocution. ABSTRACTS – ASN Report on the state of nuclear safety and radiation protection in France in 2022 59 Regional overview of nuclear safety and radiation protection • GRAND EST •