19 Design, manufacturing or assembly anomaly 15 Event or anomaly specific to the primary or secondary system 40 Reactor trip 27 Transition to safe shutdown state according to the technical operating specifications or accident procedures 9 Occurrence of an internal or external natural hazard (flood, fire, etc.) 1 Confirmed or attempted malicious act liable to affect the safety of the facility 252 Other significant event which could affect safety 19 Inadvertent start-up of a protection or safeguard system 374 Non-compliance or event which could lead to non-compliance with technical operating specifications TOTAL 756 Source : IRSN, 2021. GRAPH 1 Events involving safety in the NPPs notified in 2024 6 Event which led to or which could have led to the dispersal of dangerous materials 4 Inadvertent start-up of a protection or safeguard system 23 Other significant events which could affect safety 23 Event actually or potentially affecting the containment of hazardous materials 1 Event concerning on-site transports 1 Event affecting a safety function which could subsequently lead to an accident 24 Fault, deterioration or failure which affected a safety function 5 On-site or off-site hazard affecting the availability of important equipment 79 Event which led to safety limits being exceeded TOTAL 166 GRAPH 2 Events involving safety in BNIs other than NPPs notified in 2024 24 Non-compliance with an operational requirement which could lead to a significant impact 6 Confirmed overshoot of a discharge or concentration limit for microbiological substances 3 Non-compliance with the site or facility waste study 23 Bypassing of normal discharge channels, with a significant impact in terms of chemical substances 7 Bypassing of normal discharge channels, with a significant impact in terms of radioactive substances 24 Non-compliance with the Order of 31 December 1999 20 Other significant events which could affect the environment TOTAL 107 GRAPH 3 Significant environmental events in the BNIs notified in 2024 158 ASN Report on the state of nuclear safety and radiation protection in France in 2024 Regulation of nuclear activities and exposure to ionising radiation
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