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:
m should be provided for the manual hose station. The nozzles chosen should satisfy actual firefighting needs, satisfy electrical safety, and minimize physical damage to electrical equipment from hose stream impingement. Smoke detectors should be provided in the control room, cabinets, and consoles. If redundant safe-shutdown equipment is located in the same control room cabinet or console, addi- tional fire protection measures should be provided. Alarm and local indication should be provided in the control room. Breathing apparatus for control room operators should be readily available. The outside air intake(s) for the contrnl room ventilation system should be provided with smoke detection capability to alarm in the control room to enable manual isolation of the control room ventilation system and thus prevent smoke from entering the control room. 1.120-18 s Venting of smoke produced by fire in the control room by means of the normal ventila- tion system is acceptable; however, provision should be made to permit isolation of the recircu- lating portion of the normal ventilation system. Manually operated venting of the control room should be available to the operators. All cables that enter the control room should terminate in the control room. That is, no cabling should be simply routed through the control room from one area to another. Cables in the control room should be kept to the minimum necessary for plant operation. Cables in underfloor and ceiling spaces should meet the separation criteria given in Regulatory Guide 1.75. Air-handling functions should be ducted separately from cable runs in such spaces; i.e., if cables are routed in underfloor or ceiling spaces, these spdtes should not be used as air plenums for ventilation of the control room. Fully enclosed electrical raceways in such underfloor and ceiling spaces, if over one square foot in cross-sectional area, should have automatic fire suppression inside. Area automatic fire suppression should be