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A methodology still under development, named DREAMS (Dynamic Reliability technique for Error Assessment in Man-machine Systems), is dedicated to human reliability analysis and identifies the origin of human errors in the dynamic interaction of the operator and the plant control system. In the proposed methodology, human behaviour depends on the working environment in which the operator acts and on his psychological conditions, which are related to stress, emotional factors and fixation, as well as to lack of intrinsic knowledge. As a logical consequence of the dynamic interaction of the human with the plant under control, either the error tendency or the ability to recover from a critical situation may be enhanced. The probability of erroneous actions and of recovery is thus a function of a generic stress-in-action correlation, which represents the effect of the internal-external worlds on the operator behaviour. This leads to the evaluation of instantaneous human error/recovery probabilities (IHEP and IHRP) which are dynamically evaluated during the unfolding of the sequence of the man-machine interaction. These can then be used for evaluating an overall probability measure of plant safety related to human erroneous actions. A study case of applications of the methodology to a control system of a real nuclear power plant is given.

Additional information

Authors: CACCIABUE P C, JRC Ispra (IT);CARPIGNANO A, Politecnico di Torino, Dipartimento di Energetica (IT);VIVALDA C, Politecnico di Torino, Dipartimento di Energetica (IT)
Bibliographic Reference: Article: International Journal of Man-Machine Studies (1993) No. 38, pp. 403-428
Record Number: 199310921 / Last updated on: 1994-11-29
Original language: en
Available languages: en