Document: NRC Regulatory Guide
Document ID: 8e45dce1-e1e7-4415-b1dd-7e2a610e545b
Document Type: regulatory_guide
Title: Fire Protection for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2023/ML20231A835.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.189
CFR Part: 
CFR Title: 

Content:
ormation to determine that fire areas have been properly selected, based on the fire hazards present and the DG-1359, Page 18 need for separation of SSCs important to safety. Regulatory Position 4.1.2 provides guidelines for fire areas and zones. h. Manual fire suppression capability, including systems (e.g., hydrants, standpipes, extinguishers), fire brigades, manual firefighting equipment, plans and procedures, training, drills, mutual aid, and accessibility of plant areas for manual firefighting should be identified. The fire hazards analysis should list the location and type of manual firefighting equipment and accessibility for manual firefighting. i. Potential fire impacts on operations should be identified, including the following: (1) fire in control rooms or other locations where operations important to safety are performed, (2) fire conditions that may necessitate evacuation from areas that are required to be attended for safe shutdown, and (3) lack of adequate access or smoke removal facilities that impede plant operations or fire extinguishment in plant areas important to safety. j. Potential disabling effects of fire suppression systems on safe-shutdown capability should be identified. 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 “Firefighting systems shall be designed to assure that their rupture or inadvertent operation does not significantly impair the safety capability of these structures, systems, and components.” k. Explosion-prevention measures in areas subject to potentially explosive environments from flammable gases or other potentially energetic sources (e.g., chemical treatment systems, ion exchange columns, high-voltage electrical equipment) should be listed. l. The availability of oxygen (e.g., inerted