Study of a PWR Component Cooling Water System by the Disco Methodology

摘要

The DISCO (Determination of Importance Sensitivity of Components) method objective is to rank the components of a system. Such ranking is important to answer many questions on availability, maintenance..., for instance to look for: the best component to improve for availability, the first component to repair in case of system failure, and so on. This method was described at the 4th Euredata Conference. Since then it was extended first by including a Failure Mode and Effect Analysis to provide suitable inputs to the second step in the form of fault-trees and eventually Markov graphs, second by applying some importance technique to Markov description. This method was applied, in particular, to the study of a PWR Component Cooling Water System, connected to the Residual Heat Removal System, using the SRDF (Systeme de Recueil de Donnees de Fiabilite) data. Due to several redundancies this system has degraded situations and different working conditions. For these reasons this study implies the generalisation of the method to Markov graphs. The influence of other coupled systems on the results was also studied. (ERA citation 12:006653)