The organizational factor in PSA framework

Abstract The goals of the Man–Machine–Organization system analysis are to develop the suitable studies and techniques to identify, prevent and predict the cause of system unavailability. A descriptive concept of man–machine–organization system was developed. MMOS is defined in probability theory in the attempt to find ways for its qualitative and quantitative quantification in a PSA framework. The need for this study was demonstrated by analysis of variance of the complex system unavailability in relation to human error probability (HEP) and organizational error probability (OMP). The PSA model proposed in this paper assesses the organizational factor in MMOS by observing its influence on the human factor and equipment. Thus the influence of organizational factors is evaluated not only on component but also on the human performance. The study highlights the need to improve the understanding of the influence of organizational factors on the safe operation of nuclear installations. Using MMOS concept in PSA could identify any serious deficiencies of human and equipment performance which can sometime be corrected by improvement of the organizational factor.

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