Monthly Archive for: ‘June, 2013’

Spectrum of Risk Decision Methods

MULTIPLE CAUSES USED IN LOPA

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The CCPS book clearly states LOPA uses a single cause-consequence pair, the worst combination, for the order-of-magnitude risk estimate. Other methods, especially Fault Tree, are more appropriate to treat multiple initiating events. Many times simply summing the initiating events is not appropriate due to limitations in the simplifying assumptions behind the development of LOPA. There are several reasons outlined in …

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