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The accident scenario with the highest consequence that is physically possible regardless of likelihood (Kim et al. 2006).

A worst‐case release scenario may, for example, involve the release of the maximum quantity of some hazardous material during “worst‐case” weather conditions. Worst‐case scenarios are often used in establishing emergency plans, but should not be used in, for example, land use planning (see Chapter 5).

Because a worst‐case accident scenario often has a remote probability of occurrence, a more credible accident scenario may be more relevant.