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:
production in a range similar to that of ordinary hydrocarbons. When burning, they produce heavy smoke that obscures visibility and can plug air filters, especially charcoal and HEPA. The halogenated plastics also release free chlorine and hydrogen chloride when burning which are toxic to humans and corrosive to equipment. (4) Storage of flammable liquids should, as a minimum, comply with the requirements of NFPA 30 (Reference 21) , "Flammable and Combustible Liquids Code.". 169 170 (5) Hydrogen lines in safety-related areas should be either designed to seismic Class I requirements, or sleeved such that the waterouter pipe is directly vented to the outside, 171 or should be equipped with excess flow valves so that in case of a line break, the hydrogen concentration in the affected areas will not exceed 2%. Generic Letter 93-06 provides additional guidance with regard to hydrogen systems.172 e. Electrical Cable Construction, Cable Trays, and Cable Penetrations (1) Only metal should be used for cable trays. Only metallic tubing should be used for conduit. Thin-wall metallic tubing should not be used. Flexible metallic tubing should only be used in short lengths to connect components to equipment. Other raceways should be made of noncombustible material. (2) Redundant safety-related cable systems outside the cable spreading room should be separated from each other and from potential fire exposure hazards in nonsafety-related areas by fire barriers with a minimum fire rating of 3 hours. These cable trays should be provided with continuous line-type heat detectors and should be accessible for manual Trays exceeding 61 cm (24 inches) should be counted as two trays; trays exceeding 122 cm * (48 inches) should be counted as three trays, regardless of tray fill. DRAFT Rev. 4 - April 1996 9.5.1-44 firefighting. Cables should be designed to allow wetting down with fire suppression water without electrical faulting. Manual hose stations and portable hand extinguishers should