hazards. It must also be able to take the necessary steps in the event of any incident or accident situations which would lead to pollution. The licensee must thus for instance precisely identify the location of each dangerous substance on its site, along with the corresponding quantities. Drums and tanks must be labelled in compliance with the European Classification, Labelling, Packaging (CLP) regulation and there must be retention areas designed to collect any spills. The NPPs must also adopt an organisation and resources to prevent pollution of the natural environment (groundwater, river, estuary, sea, soil). At the request of ASN, EDF has for several years been carrying out steps to improve its management of the pollution risk by working to improve the confinement of dangerous liquid substances on its sites. 2.6.3 Assessment of control of environmental and health impacts and non-radiological hazards ASN monitors the organisational and material measures put into place by EDF to prevent non-radiological risks and the liquid pollution that could result from the dangerous substances present in its installations. It also checks those designed to guarantee control of the detrimental effects arising from the operation of the installations, such as water intake, effluent discharges into the natural environment, and pathogenic hazards. As each year, ASN carried out inspections on these measures in 2024. ASN in particular ran a campaign of tightened inspections in the Golfech, Blayais and Civaux NPPs on the topics of managing liquid containment in the event of spillage of a dangerous or radioactive substance, as well as the regulatory conformity and environmental performance. Concerning the management of liquid containment, ASN considers that the sites need to progress further in taking steps associated with the preliminary checks on the containment means and structures currently in use, on implementing the operational documentation in the event of an emergency, as well as in raising the awareness and training the persons concerned. For each of the NPPs concerned, the inspectors also underlined the need to run field checks on the hypotheses adopted for the sizing of the long-term provisions made for liquid containment in order to meet the requirements set by ASN resolution 2013-DC-0360 of 16 July 2013. Finally, ASN found that certain installations involved in the treatment of water or effluents are undergoing refurbishment or diagnostic programmes designed to identify the short-term improvements to be made. In this respect, the inspectors consider that, in its diagnostics and refurbishment programmes, EDF must give greater priority to the water consumption and effluent discharge reduction targets. More generally, ASN underlines the importance of the fact that in the operational and maintenance choices concerning its installations, each site must adopt a forward-looking vision taking account of hydro-climatic changes and the sensitivity of the water resource, in order to identify the possible measures to attenuate the impacts on this resource. More generally, ASN in 2024 found that even if discharge management remains on the whole well-controlled, the situation in this field is more contrasted than in 2023. The deviations involving non-compliance with the effluent or External contamination of two workers in the Tricastin and Saint-Laurent-des-Eaux NPPs In 2024, two significant worker contamination situations, each detected during the radiological checks performed on exiting the reactor building, led to the notification of two ESR rated level 2 on the INES scale . The first event occurred on 6 June 2024 in the Tricastin NPP. It concerns the contamination of the foot of a worker who had been performing heat insulation installation work in the reactor 4 building. The second event occurred on 25 October 2024 in the Saint-Laurent- des-Eaux NPP. It concerns contamination of the head of a worker who had been supervising the decontamination of the pool in the reactor 2 building. In both cases, the medical service took charge of the employee and removed the radioactive particle causing the contamination. Despite the investigations into precisely where they had worked, the areas where contamination took place could not be determined. The doses liable to have been received were thus estimated on the basis of the worst-case exposure duration hypotheses. They were thus evaluated as being higher than the annual regulation limit for the equivalent dose to the skin, set at 500 mSv for a skin surface area of 1 cm2. EDF notified an ESR for both situations. Owing to the regulatory occupational exposure limit being exceeded, these events were rated 2 on the INES scale. Following notification of these events, ASN carried out an inspection in the Tricastin and Saint-Laurent-des-Eaux NPPs in order to check that EDF had taken all necessary steps for adequate management of these events and analysis of their causes. GRAPH 7 Number and percentage of workers per dose range in 2024 This Graph does not include data for the Flamanville NPP EPR reactor in 2024. Source: EDF 0,001 > 0.5 0.5 > 1 1 > 2 2 > 5 5 > 6 6 > 10 10 > 15 15 > 20 Dose range (mSv) 30,952 4,108 3,992 4,421 671 1,404 114 0 67.79% 9.00% 8.74% 9.68% 1.47% 3.07% 0.25% 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 Number of workers * International scale of nuclear and radiological events, graded from 0 to 7 in increasing order of severity. (*) 316 ASN Report on the state of nuclear safety and radiation protection in France in 2024 The EDF Nuclear Power Plants
RkJQdWJsaXNoZXIy NjQ0NzU=