Abstract
The paper presents general approach, used methods and form of documentation of the results as have been applied within the Human Reliability Analysis (HRA) task of the shutdown and low power PSA study for Mochovce NPP, Unit 1,Slovakia. The SPSA project was realized by VUJE Trnava Inc., Slovakia in 2001-2002 years. The paper describes main goals of the HRA task within the SPSA project, applied methods and data sources, basic methods applied (THERP, ASEP, SLIM) and another sources of data (HEART, NUCLARR). Basic steps of the HRA task and human errors (HE) classification are also specified in its first part.. The main part of the paper deals with pre-initiator human errors (definition, considered critical activities, source of HE identification and way of modeling), human-induced initiators (definition, considered initiators, sources of possible scenarios identification and quantification) and response to initiator human errors (definition, types of considered human errors, error mechanisms, operator actions definition. Since the expert judgment method-SLIM was used for the last mentioned type of human errors probability assessment, also related activities are described including preparation works (performance shaping factors (PSFs) selection, development of PSF classification tables, preparation of aid tools for interview with plant experts), qualitative analysis (sources of information and basic steps) and quantitative analysis itself (human errors classification for final quantification including criteria used for the classification, description of structure of the spreadsheet used for quantification and treatment with dependencies). The last part of the paper describes form of documentation of the final results and provides some findings. The paper presents general approach used for human reliability analysis without detailed information about mathematical models used for human error probabilities calculation and achieved numerical results.
