Risk prevention

Probabilistic risk assessment (PRA) is a systematic and comprehensive methodology to evaluate risks associated with a complex engineered technological entity (such as an airliner or a nuclear power plant) or the effects of stressors on the environment (Probabilistic Environmental Risk Assessment - PERA) for example.Risk in a PRA is defined as a feasible detrimental outcome of an activity or action. In a PRA, risk is characterized by two quantities: 1) the magnitude (severity) of the possible adverse consequence(s), and 2) the likelihood (probability) of occurrence of each consequence.