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:
, Structures, and Components Installed in Light-Water-Cooled Nuclear Power Plants” (Ref. 106), includes information for explosion protection for offgas systems. RG 1.91, “Evaluations of Explosions Postulated to Occur on Transportation Routes Near Nuclear Power Plants” (Ref. 107), provides guidance for the assessment of explosion hazards related to transportation near the plant site. 4.2 Passive Fire-Resistive Features 4.2.1 Structural Fire Barriers Fire barriers are those components of construction (walls, floors, and their supports), including beams, joists, columns, penetration seals or closures, fire doors, and fire dampers that are rated by approving laboratories in hours of resistance to fire and are used to prevent the spread of fire. Where exact replication of a tested configuration cannot be achieved, the field installation should meet all of the following criteria: a. The continuity of the fire barrier material is maintained. b. The thickness of the barrier is maintained. c. The nature of the support assembly is unchanged from the tested configuration. d. The application or “end use” of the fire barrier is unchanged from the tested configuration. DG-1359, Page 68 e. A qualified fire protection engineer has reviewed the configuration and found that it provides an equivalent level of protection. For new reactor designs, see the enhanced fire protection criteria described in Regulatory Position 8.2 of this guide. See Regulatory Position 4.1.2 of this guide for additional guidance on the design of fire barriers relative to compartmentalization and separation of equipment. 4.2.1.1 Wall, Floor, and Ceiling Assemblies Wall, floor, and ceiling construction should be noncombustible (see Regulatory Position 4.1.1 of this guide). NFPA 221, “Standard for High-Challenge Fire Walls, Fire Walls, and Fire Barrier Walls” (Ref. 108), can be used as guidance for the construction of fire barrier walls. Materials of construction for walls, floors, and ceilings