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The main objective of the Human Reliability Assessment (HRA) is the identification and quantification of the most relevant human-machine interactions affecting the development of an incidental sequence. The quantification is made in terms of probabilities and frequencies of occurrence of unsuccessfully performed tasks/missions, due to inappropriate or inadequate human behaviour. In the Probabilistic Safety Assessment (PSA) of a plant, the probabilities of a mission failure are usually combined with the probabilities of a system failure in order to achieve the overall reliability evaluation of the man-machine system for well-defined initiating events and accident progression scenarios.

Additional information

Authors: CACCIABUE P C, JRC Ispra (IT)
Bibliographic Reference: Article: ESREDA Guidebook, Chapter 5 (1994) pp. 1-10
Record Number: 199511311 / Last updated on: 1995-11-23
Original language: en
Available languages: en
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