ABSTRACT
Reliability techniques and Probabilistic Risk Assessment (PRA) or Probability Safety Assessment (PSA) were originally developed in the nuclear power industry. PSA methodologies are employed to obtain reasonable estimates of the intrinsic and dynamic risk of complex systems like Nuclear Power Plants and Chemicals plants. The main thrust in the field of PSA has come from the nuclear industries, since this was thought to be the most dangerous and therefore needed to be “controlled”. One of the means to control the dangers of such industry is to identify and analyse occurrences. Hence the mathematical and logical approach of classic PSA techniques.
