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:
ked. Prompt emergency ingress into electrically locked areas by essential personnel should be ensured through the combined use and provision of the following features: DG-1359, Page 61 a. reliable and uninterruptible auxiliary power to the entire electrical locking system, including its controls, b. electrical locking devices that are required to fail in the secure mode for security purposes, with secure mechanical means and associated procedures to override the devices upon loss of both primary and auxiliary power (e.g., key locks with keys held by appropriate personnel who know when and how to use them), and c. periodic tests of all locking systems and mechanical overrides to confirm their operability or functionality and their capability to switch to auxiliary power. Regulatory Positions 4.1.6 and 4.1.7 of this RG provide direction related to emergency lighting and communication capabilities during fires. 4.1.3 Electrical Cable System Fire Protection Design 4.1.3.1 Cable Design Electric cable construction should pass the flame test in IEEE Standard 383, “IEEE Standard for Type Test of Class IE Electric Cables, Field Splices, and Connections for Nuclear Power Generating Stations” (Ref. 99), or IEEE Standard 1202, “IEEE Standard for Flame Testing of Cables for Use in Cable Trays in Industrial and Commercial Occupancies” (Ref. 100) (this does not imply that cables passing either test will not require additional fire protection). In the more recent editions of these standards, the flame testing requirements for cable that were originally included in IEEE 383 have been moved to IEEE 1202. For cable installations in operating plants and plants under construction before July 1, 1976, that do not meet the IEEE Standard 383 flame test requirements, all cables should be covered with an approved flame-retardant coating and properly derated or be protected by automatic suppression. Although cable coatings have been shown to reduce flame spread, coated cables are