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Communication Dans Un Congrès Année : 2023

An analysis of criticality safety "near misses"

Résumé

Among the criticality safety events reported to the nuclear safety authorities, that have occurred in nuclear facilities around the world, some have been of particular concern and are usually referred to as "near misses". They can be classified in different categories: some actually came close to critical conditions, or these conditions remained remote but were narrowly avoided thanks to an emergency human intervention, others occurred in otherwise favorable situations (margins resulting from other variable parameters) but could have come close to critical conditions assuming other authorized or possible parameters. Finally, other events would have remained far from critical conditions even potentially, but are nevertheless also considered as "near misses" for other reasons, for example serious breaches of the rules, a significant impact on the activities (shutdown), etc. In addition to these different categories of consequences, "near misses" can also be classified according to the types of original deficiencies that caused them: physical phenomena that were not previously known, lack of awareness of the importance of certain safety measures and consequently of rigor in their application, lack of basic criticality safety training, differences between the conditions described in the safety documents and those actually encountered, or simply a "detail" that escaped the vigilance of the operators or safety teams. This paper presents a "double classification" of 25 "near misses" according to both the original deficiencies and the types of consequences explained above, by briefly presenting the elements leading to these choices of categories.
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Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification

Dates et versions

irsn-04523109 , version 1 (27-03-2024)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

  • HAL Id : irsn-04523109 , version 1

Citer

Fabien Duret, Matthieu Duluc, Johann Herth. An analysis of criticality safety "near misses". ICNC 2023 - The 12th International Conference on Nuclear Criticality Safety, JAEA - Japan Atomic Energy Agency; NEA - Nuclear Energy Agency, Oct 2023, Sendai (Japan), Japan. ⟨irsn-04523109⟩

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