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:
fire from defeating the safety system function. Such protection may involve a combination of automatic fire suppression and construction capable of withstanding and containing a fire that consumes all combustibles present. Examples of such combustible materials that may not be separable from the remainder of its system are emergency diesel generator (EDG) fuel oil day tanks, turbine-generator oil and hydraulic control fluid systems, and reactor coolant pump (RCP) lube oil collection systems. Diesel fuel oil tanks should meet the guidelines of Regulatory Positions 6.1.8 and 7.4. Turbine-generator lube oil and hydraulic systems should meet the guidelines in Regulatory Position 7.2. Regulatory Position 7.1 provides guidelines for RCP oil collection systems. Bulk gas storage and use should meet the guidelines of Regulatory Position 7.5. 2.1.4 External and Exposure Fire Hazards When an SSC important to safety is near installations such as flammable liquid or gas storage, the licensee should evaluate the risk of exposure fires (originating in such installations) to the SSCs and take appropriate protective measures. NFPA 80A, “Recommended Practice for Protection of Buildings from DG-1359, Page 42 Exterior Fire Exposures” (Ref. 59), provides guidance on such exposure protection. NFPA 30 provides guidance on minimum separation distances from flammable and combustible liquid storage tanks. NFPA 55, “Compressed Gases and Cryogenic Fluids Code” (Ref. 60), gives separation distances for gaseous and liquefied hydrogen (see Regulatory Position 7.5 of this guide). NFPA 58, “Liquefied Petroleum Gas Code” (Ref. 61), contains guidance for liquefied petroleum gas. Miscellaneous areas, such as shops, warehouses, auxiliary boiler rooms, fuel oil tanks, radwaste buildings, and flammable 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