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:
ssly for holding wires, cables, or busbars, with additional functions as permitted by code. Raceways include, but are not limited to, rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquid-tight flexible conduit, flexible metallic tubing, flexible metal conduit, electrical nonmetallic tubing, electrical metallic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways. radiant energy (heat) shield: A noncombustible or fire-resistive barrier installed to provide separation protection of redundant cables, equipment, and associated nonsafety circuits within containment. redundant train or system: One of two or more similar trains of equivalent capacity in the same system powered by separate electrical divisions or one of two or more separate systems that each perform the same post-fire safe-shutdown function as its design function. With respect to fire protection DG-1359, Page 111 regulatory requirements and guidance, a redundant train or system is distinct from an alternative or dedicated shutdown train or system (see also success path). repair: An action that may be credited with achieving and maintaining cold shutdown, including the replacement of fuses and cabling. Selected equipment replacement is also allowed if practicable. Repairs not permitted include the use of clip leads in control panels (i.e., hard-wired terminal lugs should be used) and the use of jumper cables other than those fastened with terminal lugs. Repairs should be of sufficient quality to ensure safe operation until the normal equipment is restored to an operating condition. restricted area: Any area to which the licensee controls access for purposes of protecting individuals from exposure to radiation and radioactive materials. safe shutdown: For fire events, those plant conditions specified in the plant technical specifications as hot standby, hot shutdown, or cold shutdown. safe-shutdown