Quantitative Risk Assessment (QRA) is a valuable tool for determining the risk from hazardous activities of facility or operation. It is quantifies risks in terms of probability and consequence and compares results with risk criteria to determine whether risk is acceptable or unacceptable. QRA is estimate risk levels and assess significance and identify main risk contributors. The risk results are presented in the following standard forms:

• Individual risk contours which show the geographical distribution of risk to an individual.


• Group risk (FN) curves which show the cumulative frequency (F) distribution of accidents causing different numbers (N) of fatalities. The FN curve therefore indicates whether the societal risk to the facility is dominated by relatively frequent accidents causing small numbers of fatalities or low frequency accidents causing many fatalities.