21 Inadvertent start-up of a protection or safeguard system 22 Design, manufacturing or assembly anomaly 5 Occurrence of an internal or external natural hazard (flood, fire, etc.) 9 Event or anomaly specific to the primary or secondary system 43 Transition to shutdown state according to the technical operating specifications or accident procedures 356 Non-compliance or event which could lead to non-compliance with technical operating specifications 22 Reactor trip 236 Other significant event which could affect safety TOTAL 714 GRAPH Events involving safety in the NPPs notified in 2023 1 21 Event actually or potentially affecting the containment of hazardous materials 17 Other significant events which could affect safety 4 Event concerning on-site transports 10 Inadvertent start-up of a protection or safeguard system 4 On-site or off-site hazard affecting the availability of important equipment 27 Fault, deterioration or failure which affected a safety function 79 Event which led to safety limit(s) being exceeded 1 Event which led to or could have led to dispersal of hazardous materials TOTAL 163 GRAPH Events involving safety in BNIs other than the NPPs notified in 2023 2 16 Other significant event which could affect the environment 1 Discovery of a site significantly polluted by chemical or radioactive materials 7 Non-compliance with the site or facility waste study 5 Confirmed overshoot of a discharge or concentration limit for microbiological substances 6 Bypassing of normal discharge channels, with a significant impact in terms of radioactive substances 24 Non-compliance with the Order of 31 December 1999 17 Non-compliance with an operational requirement which could lead to a significant impact 20 Bypassing of normal discharge channels, with a significant impact in terms of chemical substances TOTAL 96 GRAPH Significant environment-related events in BNIs notified in 2023 3 156 ASN Report on the state of nuclear safety and radiation protection in France in 2023 • 03 • Regulation of nuclear activities and exposure to ionising radiation
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