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:
If a gas extinguishing system is used for fire suppression, these dampers should be strong enough to support the pressure rise accompanying the agent discharge and seal tightly against infiltration of the agent into the control room. CO2 total-flooding systems are not acceptable for these areas. Breathing apparatuses for control room operators should be readily available. DG-1359, Page 93 All cables that enter the control room should terminate in the control room. That is, no cabling should be routed through the control room from one area to another. Cables in underfloor and ceiling spaces should be rated and meet the separation criteria necessary for fire protection. Equipment that is important to safety should be mounted on pedestals, or the control room should have curbs and drains to direct water away from such equipment. Such drains should be provided with a means for closing to maintain the integrity of the control room in the event of other accidents requiring control room isolation. The control room should not be carpeted. Where carpeting has been installed (e.g., for sound abatement or other human factors), it should be tested to standards such as ASTM D2859, “Standard Test Method for Ignition Characteristics of Finished Textile Floor Covering Materials” (Ref. 116), to establish the flammability characteristics of the material. The fire hazards analysis should address these characteristics. 6.1.2.1 Control Room Fire Suppression Manual firefighting capability should be provided for both of the following: a. fire originating within a cabinet, console, or connecting cables; and b. exposure fires involving combustibles in the general room area. Portable Class A and Class C fire extinguishers should be located in the control room. A hose station should be installed inside or immediately outside the control room. Nozzles that are compatible with the hazards and equipment in the control room should be provided for the manual hose station. The nozzles chosen