SOME REASONS FOR CONSIDERING QRA

The decision to use QRA to satisfy a particular purpose may be the result of many compounding circumstances. There is no single way that the 

An underlying nwtivation triggers one or more concerns about a company s facility or activity. Sometimes the underlying motivation is simply a perception that a problem exists. A single, memorable catastrophe can also galvanize concern. The motivation of an increasing number of companies to use QRA is a proactive desire to improve safety. 

Whatever the need, once established it defines the information requirement that can then be the focal point from which the question of using QRA can be considered Can QRA satisfy the information requirement in an efficient, appropriate manner If so, all the factors that led to the decision to use QRA now become factors that help shape the objectives and scope for the particular QRA study. 

TYPES OF INFORMATION AVAILABLE FROM RISK STUDIES 

The reasons (i.e., the motivations, concerns, activators, and needs) for considering the use of QRA define the requirements for information. The next question is, can QRA supply the appropriate information to satisfy the need By definition, QRA studies generate numerical estimates of the expected frequency and/or consequence(s) of undesired events. The results of the QRA can be formulated and used on two bases (1) an absolute basis and (2) a relative basis. 

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