Document: NUREG-0800
Document ID: eb1d19c1-686c-42f5-ba0a-c417c7b12b8e
Document Type: srp
Title: DC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070499.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
rough bus tie breakers, an acceptable design will provide for two tie breakers connected in series and physically separated from each other in accordance with the acceptance criteria for separation of safety-related systems which isas discussed below. Further, the interconnection of redundant load 90 centers must be accomplished only manually. b. To assureensure physical independence, the criteria governing the physical separation of redundant equipment, including cables and cable trays and their implementation as depicted on preliminary (CP stage) or final (OL stage)91 physical arrangement drawings, are reviewed to determine that the design arrangement satisfies the requirements of IEEE Std 384 and positions of Regulatory Guide 1.75. These guides and standards set forth acceptance criteria for the separation of circuits and electrical equipment contained in or associated with the safety-related power system. To determine that the independence of the redundant cable installation is consistent with the requirements set forth in IEEE Std 384 and the positions set forth in Regulatory Guide 1.75, the proposed design criteria governing the separation of safety-related cables and raceways are reviewed, including such criteria as those for cable derating; raceway filling; cable routing in containment penetration areas, cable spreading rooms, control rooms, and other congested areas; sharing of raceways with nonsafety-related cables or with cables of the same system or other systems; prohibiting cable splices in raceways; spacing of power and control wiring and components associated with safety-related electric systems in control boards, panels, and relay racks; and fire barriers and separation between redundant raceways. 3. DC Power Supplies and Distribution Systems In assuring To ensure that the requirements of GDC 17 and IEEE Std 308 have been met with regard to the dc power system having sufficient capacity and capability to supply the required distribution system