AbstractThis paper illustrates a method to identify and classify scenarios generated in a dynamic event tree (DET) analysis. Identification and classification are carried out by means of an evolutionary possibilistic fuzzy C-means clustering algorithm which takes into account not only the final system states but also the timing of the events and the process evolution. An application is considered with regards to the scenarios generated following a steam generator tube rupture in a nuclear power plant. The scenarios are generated by the accident dynamic simulator (ADS), coupled to a RELAP code that simulates the thermo-hydraulic behavior of the plant and to an operators’ crew model, which simulates their cognitive and procedures-guided responses.A set of 60 scenarios has been generated by the ADS DET tool. The classification approach has grouped the 60 scenarios into 4 classes of dominant scenarios, one of which was not anticipated a priori but was “discovered” by the classifier. The proposed approach may be considered as a first effort towards the application of identification and classification approaches to scenarios post-processing for real-scale dynamic safety assessments.
Identification and classification of dynamic event tree scenarios via possibilistic clustering: Application to a steam generator tube rupture event
Accident Analysis and Prevention ; 41 , 6 ; 1180-1191
2008-08-08
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
ADS , accident dynamic simulator , DET , dynamic event tree , EFW , emergency feed water , EOP , emergency operating procedures , FCM , fuzzy C-means , HPI , high pressure injection , IDAC , information, decision, and action in crew context , IE , initiating event , MFW , main feed water , NPP , nuclear power plant , PSA , probabilistic safety assessment , PWR , pressurizer water reactor , PZR , pressurizer , RCP , reactor coolant pump , RCS , reactor coolant system , SCM , subcooling margin , SG , steam generator , SGTR , steam generator tube rupture , SL , steam line , TBV , turbine bypass valve , TBVA , turbine bypass valve of a loop , UOD , universe of discourse , Dynamic event tree , Probabilistic safety assessment , Dynamic safety assessment , Fuzzy , Possibilistic , Clustering
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