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Fire PSA of the French PWR 900 MWe series Part 1: Detailed study of the critical zones


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Titre de la revue : Kerntechnik Volume : 72 N° : 3 Pagination : 132-135 Date de publication : 01/05/2007

Type de document > *Article de revue

Mots clés > REP 900 MWe

Unité de recherche > IRSN/DSR/SESPRI/BEPS

Auteurs > BARRACHIN Gilles, CORENWINDER François, VIAL Eric

Date de publication > 01/05/2007

Résumé

The Institute for Radioprotection and Nuclear Safety (IRSN) has developed a Fire Probabilistic Safety Assessment of the operating French 900 MWe PWR in order to organize into a hierarchy the items of equipments and the compartments, impacting the core melt frequency following a fire, and to reinforce deterministic safety analysis with functional analysis and realistic fire scenarios. The IRSN Fire PSA is composed of two stages: the first one concerns the selection of critical zones and the second one concerns the detailed study of the critical compartments, corresponding to the development of the fire scenarios and of the fire-induced core damage sequences. The first version of the IRSN Fire PSA has been updated by integrating the specificities of the Fire Action Plan, implemented by the utility on the French 900 MWe PWR. This study shows that four compartments are preponderant. The integration of the Fire Action Plan allowed decreasing the number of preponderant compartments. The integration of the symptom-oriented procedures and the removal of conservatisms should lead to a lower core damage frequency for these preponderant compartments. The results show that fire is not a negligible risk but the implementation of the Fire Action Plan has a significant positive impact on safety