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:
mmable and combustible liquid storage tanks, should be located and protected to prevent a fire or the effects of a fire, including smoke, from adversely affecting any SSCs important to safety (see the previous section for guidelines related to locating diesel fuel oil tanks and compressed gas supplies external to structures important to safety). In geographic areas where there is a potential for damage from wildfires (i.e., forest, brush, vegetation), the licensee should evaluate the risk potential for SSCs important to safety and take appropriate measures. NFPA 1144, “Standard for Reducing Structure Ignition Hazards from Wildland Fire” (Ref. 62), provides guidance on assessing wildfire severity and appropriate protection measures. 2.2 Control of Ignition Sources Electrical equipment (permanent and temporary), hot-work activities (e.g., open flame, welding, cutting, and grinding), high-temperature equipment and surfaces, heating equipment (permanent and temporary installation), reactive chemicals, static electricity, and smoking are all potential ignition sources. Design, installation, modification, maintenance, and operational procedures and practices should control potential ignition sources. Engineering design practices should ensure that electrical equipment is properly designed and installed in accordance with industry standards, heat-generating equipment or equipment with hot surfaces is properly cooled or separated from combustible materials, and systems containing flammable and combustible liquids or gases are properly designed and located to minimize the exposure of these materials to ignition sources. Regulatory Position 3.5 of RG 1.191 contains similar guidelines for those plants that have permanently ceased operation. 2.2.1 Open Flame, Welding, Cutting, and Grinding (Hot Work) Work involving ignition sources such as welding and flame cutting should be carried out under closely controlled conditions. Persons performing such work should be trained and