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:
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 and Hose Systems” (Ref. 85), for sizing, spacing, and pipe support requirements for Class III standpipes. Water supply calculations should demonstrate that the water supply system can meet the standpipe pressure and flow requirements of NFPA 14. Hose stations should be located as dictated by the fire hazards analysis to facilitate access and use for firefighting operations. Alternative hose stations should be provided for an area if the fire hazard could block access to a single hose station serving that area. The proper type of hose nozzle to be supplied to each area should be based on the fire hazards analysis. The usual combination spray/straight-stream nozzle should not be used in areas where the DG-1359, Page 52 straight stream can cause unacceptable mechanical damage. Fixed fog nozzles should be provided at locations where high-voltage shock hazards exist. All hose nozzles should have shutoff capability. Volume II, Section 10, Chapter 1, of the 19th Edition of the NFPA Fire Protection Handbook, issued in 2003 (Ref. 86), provides guidance on safe distances for water application to live electrical equipment. Fire hoses should meet the recommendations of NFPA 1961, “Standard on Fire Hose” (Ref. 87), and should be hydrostatically tested in accordance with the recommendations of NFPA 1962, “Standard for the Care, Use, Inspection, Service Testing and Replacement of Fire Hose Couplings, Nozzles, and Fire Hose Appliances” (Ref. 88). 3.4.2 Fire Hydrants and Hose Houses Outside manual hose installations should be sufficient to provide an effective hose stream to any onsite location where fixed or transient combustibles could jeopardize equipment important to safety. Hydrants should be installed approximately every 76 m (250 ft) on the yard main system. A hose