THE DEVELOPMENT OF A QUALITATIVE ANALYSIS METHOD TO SUPPLEMENT THE ANALYSIS OF OPERATOR'S HUMAN ERRORS IN MCR OF NPPS

Although it is well known that the probability of accidents is very low in NPPs(Nuclear Power Plants), many researches are still being performed on these accidents since their results may be so severe. Furthermore, the possibility of accidents caused by Human Factors is not negligible. For that reason, many HRA(Human Reliability Analysis) techniques have been developed, but most of them have the following problems. First, they have mainly focused on a quantitative risk analysis rather than a qualitative analysis of systems. And, it is difficult to evaluate the possibility of Error of Commissions(EOCs). Also, the results of human error analyses are not adequate for a use in design fields, and the sensitivity of the evaluation procedures is not sufficient. In this study, as a solution to these problems, a new method for the analysis of human error in NPPs was proposed. The basic concept of this method is “to evaluate the human error possibilities related to the MCR(Main Control Room) equipment”. It means a qualitative analysis for the possibility of human error which is affected by the failures or the features and the limitations of the HSI(Human System Interface) equipment introduced in the MCR. The proposed method can be useful to analyze human errors affected by faults and failures of the HSI in the MCR, which were difficult to analyze with the conventional techniques.