Document: NRC Regulatory Guide
Document ID: 80776ca5-a83d-4667-9a94-0bffa1befa91
Document Type: regulatory_guide
Title: Fire Protection Guidelines for Nuclear Power Plants (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1221/ML12216A013.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.120
CFR Part: 
CFR Title: 

Content:
to remove firefighting water should be provided. When gas systems are installed, drains should have adequate seals or the gas extinguishing systems should be sized to compensate for losses through the drains. A separate cable spreading room should be provided for each redundant division. Cable spreading rooms should not be shared between reactors. Each cable spreading room should be separated from the others and from other areas of the plant by barriers with a minimum fire rating of three hours. The ventilation system to each cable spreading room should be designed to isolate the area upon actuation of any gas extinguishing system in the area. Separate Manually actuated smoke venting that is operable from outside the room should be provided for the cable spreading room. d. Plant Computer Rooms Computer rooms for computers performing safety-related functions that are not part of the control room complex should be separated from other areas of the plant by barriers having a minimum fire resistance rating of three hours and should be protected by automatic detection and 1.120-19 fixed automatic suppression. Computers that are part of the control room complex but not in the control room should be separated and protected as described in Regulatory Position C.6.b. Computer cabinets located in the control room should be protected as other control room equipment and cable runs therein. Non-safety-related computers outside the control room complex should be separated from safety-related areas by fire barriers with a minimum rating of three hours and should be protected as needed to prevent fire and smoke damage to safety-related equipment. Manual hose stations and portable fire extinguishers should be provided in areas that contain, or could present a fire exposure hazard to, safety-related equipment. e. Switchgear Rooms Switchgear rooms containing safety-related equipment should be separateIrfrom the remainder of the plant by barriers with a minimum fire rating of three