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:
lay to permit personnel to exit. Provisions for locally disarming automatic Halon systems should be key locked and under strict administrative control. Automatic Halon extinguishing systems should not be disarmed unless controls, as described in Regulatory Position 2.4 of this guide, are provided. In addition to the guidelines of NFPA 12A, licensees should ensure preventive maintenance and testing of the systems, including verifying agent quantity of the Halon cylinders. 3.3.2.3 Clean Agents Halon alternative (or “clean agent”) fire extinguishing systems should comply with applicable standards, such as NFPA 2001. Only listed or approved agents should be used. Provisions for locally disarming automatic systems should be key locked and under strict administrative control. Automatic extinguishing systems should not be disarmed unless controls, as described in Regulatory Position 2.4 of this guide, are provided. In addition to the guidelines of NFPA 2001, licensees should ensure preventive maintenance and testing of the systems, including verifying agent quantity of the clean agent cylinders or containers. 3.4 Manual Suppression Systems and Equipment The licensee should provide a manual firefighting capability throughout the plant to limit the extent of fire damage. Standpipes, hydrants, and portable equipment consisting of hoses, nozzles, and extinguishers should be provided for use by properly trained firefighting personnel. 3.4.1 Standpipes and Hose Stations Interior manual hose installations should be able to reach, with at least one effective hose stream, any location that contains, or could present, a fire exposure hazard to equipment important to safety. To accomplish this, all buildings on all floors should have standpipes with hose connections equipped with a maximum of 30.5 meters (m) (100 feet (ft)) of 38-mm (1.5-in.) woven-jacket, lined fire hose and suitable nozzles. These systems should conform to NFPA 14, “Standard for the Installation of Standpipe