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:
REVIEW RESPONSIBILITIES Primary - Power SystemsElectrical Engineering Branch (PSBEELB)1 Secondary - None I. AREAS OF REVIEW The descriptive information, analyses, and referenced documents, including electrical single-line diagrams, electrical schematics, functional piping and instrument diagrams, logic diagrams, tables, and physical arrangement drawings for the dc onsite power system presented in the applicant's safety analysis report (SAR), are reviewed. The intent of the review is to determine that the dc onsite power system satisfies the requirements of General Design Criteria 2, 4, 5, 17, 18, and 50 and will perform its intended functions during all plant operating, and accident, and station blackout conditions. 2 The dc power systems include those dc power sources and their distribution systems and vitalauxiliary supporting systems provided to supply motive or control power to safety-related 3 equipment and to equipment used to cope with a station blackout event. Batteries and battery 4 chargers are used as the power sources for the dc power system, and inverters are used to convert dc from the dc distribution system to ac instrumentation and control power, as required. The PSBEELB will pursue the following phases in the review of the dc power systems during 5 both the construction permit (CP) and operating license (OL) stages of the licensing process: DRAFT Rev. 3 - April 1996 8.3.2-2 1. System Redundancy Requirements The system is reviewed to determine that the required redundancy of components and subsystems is provided. This requires an examination of the dc power system configuration, including power supplies, power supply feeders, load center arrangements, loads supplied from each bus, and power connections to the instrumentation and control devices of the system. 2. Conformance with the Single Failure Criterion In determining the adequacy of this system to meet the single failure criterion, the electrical and physical separation of redundant power