Document: NUREG-0800
Document ID: b351c30f-74b4-4d36-833e-939d23abae4e
Document Type: srp
Title: D-C POWER-SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350494.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
ther 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. D-C Power Supplies and Distribution Systems In assuring that the requirements of GOC 17 and IEEE Std 308 have been met with regard to the d-c power system having sufficient capacity and capability to supply the required distribution system loads, the design bases, design criteria, analyses, description, and implementation as depicted on electrical drawings and performance characteristic curves are reviewed. To establish that the capacity of the d-c supply is adequate to power the prescribed loads, the nameplate capacity claimed in the design bases is checked against the loads identified in electrical distri- bution diagrams. The capability of the system is reviewed by evaluating 8.3.2-7 Rev. 2 - July 1981 -the performance characteristic curves, that illustrate the response of the supplies to the most severe loading conditions at the plant. The perfor- mance characteristic curves would include-voltage profile curves, discharge rate curves, and.temperature effect curves. The capacity of the d-c supplies should be assured by periodic discharge tests of the batteries as described in IEEE Std 450 and Regulatory Guide 1.129. The reviewer incoordination with other branches becomes familiar with the purpose and the operation of each safety system, including system component arrangements as depicted on functional P&Its, expected system performance as established in the accident analyses, modes of system operation and interactions during normal and accident conditions, and interactions between systems. Following this, it is verified that the tabulation of all safety-related loads to be connected to each d-c supply is consistent with the Information obtained incoordination with other branches. The characteristics of each