[en] The probabilistic safety assessment (PSA) results for Kori Unit 2 showed that the common cause failure (CCF) events of emergency service water system (ESWS) pump failure to run were identified as one of the dominant contributors to its internal event core damage frequency (CDF). The generic values of the CCF parameters were used in PSA projects for the Kori Unit 2. Thus, we performed the plant specific detailed CCF analysis to estimate the CCF parameters of ESWS pump failure to run for Kori Unit 2 with the CAFE-PSA(common CAuse Failure Event analysis program for PSA), a program to analyze CCF events in the ICDE database