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:
Elevators should not be used during fire emergencies. 4.1.4.4 Fire Dampers Redundant safe-shutdown components may be separated by fire-resistant walls, floors, enclosures, or other types of barriers. For the fire barriers to be effective in limiting the propagation of fire, ventilation duct penetrations of fire barriers should be protected by means of fire dampers that are arranged to automatically close in the event of fire. NFPA 90A, “Standard for the Installation of Air-Conditioning and Ventilating Systems” (Ref. 104), provides additional guidance (see also Regulatory Position 4.2.1.3 of this guide). 4.1.5 Drainage Floor drains sized to remove expected firefighting water without flooding equipment important to safety should be provided in areas where fixed water fire suppression systems are installed. Floor drains should also be provided in other areas where hand hose lines may be used if such firefighting water could cause unacceptable damage to equipment important to safety in the area. Facility design should ensure that fire-water discharge in one area does not impact equipment important to safety in adjacent areas. Housekeeping procedures should ensure that accumulated dirt or other debris does not block drains. Where gaseous suppression systems are installed, the drains should be provided with adequate seals, or the gas suppression system should be sized to compensate for the loss of the suppression agent through the drains (see Regulatory Position 3.3.2 of this guide). Drainage in areas containing equipment important to safety should be designed to minimize the potential to propagate fire from areas containing flammable or combustible liquids via the drainage system. Water drainage from areas that may contain radioactivity should be collected, sampled, and analyzed before discharge to the environment. 4.1.6 Emergency Lighting Emergency lighting should be provided throughout the plant as necessary to support fire suppression actions and safe-shutdown