Document: NRC Regulatory Guide
Document ID: 80776ca5-a83d-4667-9a94-0bffa1befa91
Document Type: regulatory_guide
Title: Fire Protection Guidelines for Nuclear Power Plants (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1221/ML12216A013.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.120
CFR Part: 
CFR Title: 

Content:
inutes when tested for the largest number of cable routings and maximuia cable density. 2 Trays exceeding 24 inches should be ccunted as two trays; trays exceeding 48 inches should be counted as three trays, regardless of tray fill. 3 Penetration qualification test criteria are under development. Guidance is currently available in the form of a draft standard, "Standard for Cable Penetration Fire Stop Test Procedure," being developed by Task Force 12-40 of the IEEE Insulated Conductors Committee. 1.120-12 (5) Electric cable constructions should, as a minimum, pass the flame test in the current IEEE Std 383, (This does not imply that cables passing this test will not require fire protection.) (6) Cable raceways should be used only for cables. (7) Miscellaneous storage and piping for flammable or combustible liquids or gases should not create a potential exposure hazard to safety-related systems. d. Ventilation (1) The products of combustion and the means by which they will be removed from each fire area should be established during the initial stages of plant design. Consideration should be given to the installation of automatic suppression systems as a means of lioiting smoke and heat generation. Smoke and corrosive gases should generally be discharged directly outside to an area that will not affect safety-related plant areas. The normal plant ventilation system may be used for this purpose if capable and available. To facilitate manual firefighting, separate smoke and heat vents should be provided in specific areas such as cable spreading rooms, diesel fuel oil storage areas, switchgear rooms, and other areas where the potential exists for heavy smoke conditions (see NFPA 204 for additional guidance on smoke control). (2) Release of smoke and gases containing radioactive materials to the environment should be monitored in accordance with emergency plans as described in the guidelines of Regula- tory Guide 1.101, "Emergency Planning for Nuclear Power Plants." Any