A framework to estimate task opportunities from the operational experience of domestic nuclear power plants

Use of a big data analysis technique for extracting HRA data from event investigation reports based on the Safety-II concept

“…The second technical issue is to collect the values of PSF-related instances with respect to success cases. In order to clarify this issue, let us consider an unanticipated reactor trip event that has occurred in one of the commercial NPPs in the Republic of Korea on December 4, 2008 [Park et al, 2016c]. Brief explanations about this event are given as below, and more detailed information can be found from NEED (2017).…”

“…1If so, the key problem is to reckon TFP. To this end, Park et al (2016c) proposed three principal rules for calculating TFP. Unfortunately, these three rules are not directly applicable to calculating the number of success cases when an off-normal event has occurred.…”

“…In this light, Park et al (2016c) proposed a practical method based on the representative frequencies of 101 abnormal events, which are determined by scrutinizing various kinds of component failure data collected from of domestic NPPs [KHNP, 2011]. According to the catalog of the representative frequencies, for example, it is anticipated that the trip of a main feedwater pump is supposed to occur about twice a year.…”

“…That is, the number of a successful performance for the AOP of a main feedwater pump trip can be obtained by quantifying /2.0. More detailed explanations can be found from Park et al, (2016c).…”

“…and (3) how we are able to properly analyze a huge amount of information gathered from both failure and success cases? In order to resolve the first and second technical challenges, in this study, the catalog of generic information items suggested by is combined with a framework proposed by Park et al (2016c). In addition, one of the representative big data analysis techniques called the CART (Classification And Regression Tree) is applied to deal with the third technical challenge.…”