Document: NUREG-0800
Document ID: 16c1145e-ffe2-48c4-bd44-0ccaeb83dc99
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070563.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
Systems" ). 65 Exposure Fire - An exposure fire is a fire in a given area that involves either in situ or transient combustibles and is external to any structures, systems, or components located in or adjacent to that same area. The effects of such fire (e.g., smoke, heat, or ignition) can adversely affect those structures, systems, or components important to safety. Thus, a fire involving one train of safe 9.5.1-17 DRAFT Rev. 4 - April 1996 shutdown equipment may constitute an exposure fire for the redundant train located in the same area, and a fire involving combustibles other than either redundant train may constitute an exposure fire to both redundant trains located in the same area. Fire Area - that portion of a building or plant that is separated from other areas by boundary66 fire barriers. Fire Barrier - 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. Fire Stop - a feature of construction that prevents fire propagation along the length of cables or prevents spreading of fire to nearby combustibles within a given fire area or fire zone. Fire Brigade - the team of plant personnel assigned to firefighting and who are equipped for and trained in the fighting of fires. Fire Detectors - a device designed to automatically detect the presence of fire and initiate an alarm system and other appropriate action (see NFPA 72E [Reference 25] , "Automatic Fire 67 68 Detectors" ). Some typical fire detectors are classified as follows: 69 Heat Detector - a device that detects a predetermined (fixed) temperature or rate of temperature rise. Smoke Detector - a device that detects the visible or invisible products of combustion. Flame Detector - a device that detects the infrared, ultraviolet, or visible radiation produced by a fire. Line-Type