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:
aces; i.e., if cables are routed in underfloor or ceiling spaces, these spaces should not be used as air plenums for ventilation of the control room. Fully enclosed electrical raceways located in such underfloor and ceiling spaces, if over 0.09 m (1 square foot) in cross-sectional area, should have 2 241 automatic fire suppression inside. Area automatic fire suppression should be provided for DRAFT Rev. 4 - April 1996 9.5.1-56 underfloor and ceiling spaces if used for cable runs unless all cable is run in 10 cm (4-inch) or 242 smaller steel conduit or the cables are in fully enclosed raceways internally protected by automatic fire suppression. There should be no carpeting in the control room. c. Cable Spreading Room The primary fire suppression in the cable spreading room should be an automatic water system such as closed-head sprinklers, open-head deluge system, or open directional water spray system. Deluge and open spray systems should have provisions for manual operation at a remote station; however, there should be provisions to preclude inadvertent operation. Location of sprinkler heads or spray nozzles should consider cable tray arrangements and possible transient combustibles to ensure adequate water coverage for areas that could present exposure hazards to the cable system. Cables should be designed to allow wetting down with water supplied by the fire suppression system without electrical faulting. Open-head deluge and open directional spray systems should be zoned. The use of foam is acceptable. Cable spreading rooms should have: (1) At least two remote and separate entrances for access by fire brigade personnel; (2) An aisle separation between tray stacks at least 1 m (3 feet) wide and 2.4 m (8 feet) 243 244 high; (3) Hose stations and portable extinguishers installed immediately outside the room; (4) Area smoke detection; and (5) Continuous line-type heat detectors for cable trays inside the cable spreading room. Drains to remove firefighting water