Updates of the french criticality safety analysis guide and event database (logic)
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.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification