This standard¹⁾ sets forth requirements for fire probabilistic risk assessments (Fire PRAs) used to support risk-informed decisions for commercial light water reactor (LWR) nuclear power plants and prescribes general requirements for Fire PRA practice intended to suit a wide range of applications. This standard covers fires occurring within the plant.²⁾ The American National Standard "External-Events PRA Methodology," ANSI/ANS-58.21-2007 [1],³⁾ covers fires occurring outside the plant.

¹⁾The current standard, ANSI/ANS-58.23-2007, is herein referred to as "this standard."

²⁾ Note that the term "fires occurring within the plant" in this context is defined as any fire originating within the global analysis boundary as defined per the plant partitioning technical element.

³⁾ Numbers in brackets refer to corresponding numbers in Sec. 7, "References."

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