Identifying Facility Siting Raw Risk and the Risk Reduction Decision Process

by Craig Shell & Stephen W. Kelly

One of the outcomes of a facility siting study is the presentation of information to the facility site leadership team so they can recognize all of the hazards that can impact buildings intended for occupancy. It is this hazard recognition and risk reduction process that will be discussed in this paper. The authors will present a methodology for completing a facility siting assessment that starts with identifying a MCE, followed by breaking the MCE into additional credible events, and identifying likelihood and additional safeguards needed to manage the risk.

The authors will present examples to illustrate this process and how different models affect the results. Hazard scenarios to be presented include leaks from flammable storage and transfer systems resulting in outdoor vapor cloud explosions as well as explosions within a building. Through these examples, differences in hazard impacts will be presented. Various likelihood references and resultant risk rankings will be shown. Based on these risk rankings and a tolerable risk criteria, proposed safeguards necessary to close a gap will be described. Presenting information in this manner allows the site leadership team to better allocate resources more effectively in minimizing facility siting risks.

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