Document: NUREG-0800
Document ID: 05a851a6-07ff-41b4-8528-a032ba433e04
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0327/ML032740044.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
ety. g. Layout and configurations of structures, systems, and components important to safety. The protection for safe shutdown systems within a fire area should be determined on the basis of the worst case fire postulated at the location within each fire area/zone that will produce the most severe fire with the potential to adversely impact structures, systems, and components important to safety. Fire development should consider the potential for involvement of other combustibles, both fixed and transient, in the fire area. The extent of such damage should be evaluated in the fire hazards analysis and should consider exposure to fire, heat, smoke, or water. The analysis should consider the degree of spatial separation between redundant shutdown systems, the combustibles present, the available fire protection systems and features, sources of ignition, and the susceptibility to fire damage of the safe-shutdown-related cables, equipment, systems, and features in the area. Where automatic suppression systems are installed, the effects of the postulated fire should be evaluated with and without actuation of the automatic suppression system. h. Potential fire impacts on operations, including: 1. Fire in control rooms or other locations having critical functions important to safety, 2. Fire conditions that may necessitate evacuation from areas that are required to be attended for safe shutdown, 3. Lack of adequate access or smoke removal facilities that impede plant operations or fire extinguishment in plant areas important to safety. i. Potential disabling effects of fire suppression systems on shutdown capability. The term "damage by fire" in Appendix R also includes damage to equipment from the normal or inadvertent operation of fire suppression systems. The fire hazards analysis should address the effects of firefighting activities. GDC 3 of Appendix A to 10 CFR Part 50 states that "Fire-fighting systems shall be designed to assure that their rupture or inadvertent