BEPU analysis of a 2-in DVI break in a generic IRIS SMR by ASTEC -RAVEN coupling
Résumé
Advanced light-water Small Modular Reactors (SMRs) have acquired great interest in the international framework due to recognized advantages in terms of flexibility, capital cost and especially safety features, achieved by their designs. The "inherent safety" of SMRs is guaranteed by lower decay-heat, allowing the use of integral configuration for the primary coolant system and of passive safety systems. In the framework of NUGENIA TA-2 ASCOM collaborative project, coordinated by IRSN, an ASTEC code generic input-deck, based on an IRIS-like reactor, has been recently developed with the aim of studying the code capability to simulate SMR designs in challenging conditions. In the present paper, a Best-Estimate Plus Uncertainty (BEPU) method has been applied to study the safety criteria in a Design Basis Accident (DBA) due to a 2-in guillotine break of a Direct Vessel Injection (DVI) line and by assuming the operability of the passive safety systems of the generic IRIS. The uncertainty quantification study is performed through the propagation of the input uncertainty methodology, by implementing the RAVEN-ASTEC coupling on a multi-core cluster. The input uncertainty parameters perturbing the system are selected among the main reactor's initial and boundary conditions as well as related to passive safety systems. The statistical study of the reactor response in terms of output variation of the main safety Figures Of Merit (FOMs) is carried out by analyzing the sensitivity of the FOMs, with respect to the variation of the input uncertainties. The study is aimed to provide information regarding the role played by passive safety systems in the mitigation strategy; to characterize the thermal-hydraulic response of the code model and its capability to simulate the main natural-driven phenomena of passive advanced SMRs; and to develop a first uncertainty analysis regarding ASTEC application to SMR.
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