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:
etection and suppression capabilities should be addressed. The fire hazards analysis should describe the level of automatic protection (e.g., water spray density, gaseous agent concentration) provided relative to the specific fire hazards that have been identified. The effects of lightning strikes should be included in the design of fire detection systems. e. The layout and configurations of SSCs important to safety should be depicted. The protection for safe-shutdown systems (see Regulatory Positions 5.3 and 5.4 of this guide) within a fire area should be determined on the basis of the worst-case fire that is likely to occur and the resulting damage. The fire hazards analysis should explain and document the extent of such damage. The analysis should consider the degree of spatial separation between redundant shutdown systems, the presence of in situ and transient combustibles, the available fire protection systems and features, sources of ignition, and the susceptibility to fire damage of the cables, equipment, systems, and features in the area that are related to safe shutdown. f. Reliance on and qualifications of fire barriers, including fire test results, the quality of the materials and barrier system, and the quality of the barrier installation should be described. Regulatory Position 4.3 of this guide provides detailed guidelines for testing and qualifying electrical raceway fire barrier systems. g. Fire area construction (walls, floor, and ceiling materials, including coatings and thicknesses; fireproofing of structural members; area dimensions and volume; normal ventilation and smoke removal capability; and level of congestion as it applies to access for manual firefighting activities) should be described. The fire hazards analysis should provide sufficient information to determine that fire areas have been properly selected, based on the fire hazards present and the DG-1359, Page 18 need for separation of SSCs important to safety. Regulatory Position 4.1.2