Document: NUREG-0800
Document ID: 9fa7092c-7628-402d-9028-6601d5f5fdfb
Document Type: srp
Title: DC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550063.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
cation of Cables, Raceways, and Terminal Equipment. The staff will review the identification scheme used for safety-related cables, raceways, and terminal equipment in the plant and internal wiring in the control boards to confirm that it is consistent with IEEE Std. 384, as augmented by Regulatory Guide 1.75. This includes the criteria for differentiating among (a) safety-related cables, raceways, and terminal equipment of different channels or divisions, (b) nonsafety-related cable that is run in safety raceways, (c) nonsafety-related cable that is not associated physically with any safety division, and (d) safety-related cables, raceways, and terminal equipment of one unit with respect to the other units at a multiunit site. 5. Vital Supporting Systems. The reviewer will evaluate supporting systems identified as vital to the operation of safety-related loads and systems. As endorsed by Regulatory Guide 1.153, IEEE Std. 603 provides a method acceptable to the staff to evaluate all aspects of the instrumentation, control, and electrical portions of auxiliary supporting systems and features, including basic requirements that call for auxiliary supporting systems and features to satisfy the same criteria as the supported safety systems. Compliance with IEEE Std. 603-1991 is only required for plants with construction permits issued after May 13, 1999. Operating nuclear power plants are encouraged, but not required, to comply with IEEE Std. 603 for future system-level modifications. The staff will review the instrumentation, control, and electrical aspects of the vital supporting systems and features to ensure that their design conforms to the same criteria as those for the systems that they support. Hence, the review procedure for ascertaining the adequacy of these systems and features is the same as that discussed herein for the onsite systems. In essence, the reviewer first becomes familiar with the purpose and operation of each vital supporting system and feature,