Review of Findings for Human Performance Contribution to Risk in Operating Events

Abstract

Abstract : This report documents results of analyses of human performance and investigations into its contribution to risk in operating events. The Oak Ridge National Laboratory (ORNL) Accident Sequence Precursor (ASP) Program and the Nuclear Regulatory Commission (NRC) Human Performance Events Database (HPED) were used to identify events in which human performance significantly contributed. Standardized Plant Analysis Risk (SPAR) plant models developed under NRC sponsorship at the Idaho National Engineering and Environmental Laboratory (INEEL) were run using the Systems Analysis Programs for Hands-on Integrated Reliability Evaluation (SAPHIRE) software to calculate the conditional core damage probabilities (CCDPs) for these events. Forty-eight events were reviewed. Eleven were determined to have very little human performance involvement and were not analyzed further. The remaining 37 plant-specific events influenced by human performance were selected for analysis. Twenty-three events were analyzable using standardized Rev. 2QA or Rev. 3i SPAR models and methods. The other 14 events involved operating modes or conditions not within the scope of the SPAR models. A team of plant systems/SPAR, Human Reliability Analysis (HRA), and operations analysts performed qualitative analyses for all 37 events. Several findings drawn from the analyses of events with human performance contributions are discussed.

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