Document: NUREG-0800
Document ID: d9e9d0a9-6390-4154-94dc-7d5e6d8145cd
Document Type: srp
Title: A-C POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350489.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
formation, including the design bases and their relation to the acceptance criteria, preliminary analyses, electrical single-line diagrams, functional logic diagrams, preliminary functional piping and instrumentation diagrams (P&IDs), and preliminary physical arrangement drawings are examined to determine that there is reasonable assurance that the final design will meet these objectives. At the OL stage, these objectives are verified during the review of final electrical schematics, functional P&IDs, and physical arrangement drawings and are confirmed during a visit to the site. To ensure 8.3.1-7 Rev. 2 - July 1981 that acceptance criteria stated in subsection II are satisfied, the review is performed as detailed below. The primary reviewer will coordinate this review with the other branch areas of review as stated in subsection I. The primary reviewer obtains and uses such input as required to ensure that this review procedure is complete. 1. System Redundancy Requirements General Design Criteria 33, 34, 35, 38, 41 and 44 set forth requirements with regard to the safety systems that must be supplied by the a-c onsite power system. Also, these criteria state that safety system redundancy should be such that for onsite power system operation (assuming offsite power is not available), the system safety function can be accomplished assuming a single failure. The acceptability of the onsite power system with regard.to redundancy is based on conformance to the same degree of redundancy of safety-related components and systems required by these General Design Criteria. The descriptive informdtion including electrical single-line diagrams (CP and OL stage), functional P&IDs (CP and OL stage), and electrical schematics (L stage) is reviewed to verify that this redundancy is reflected in the standby power system with regard to both power sources and associated distribution systems. Also, it is verified in-coordination with other branches that. redundant safety loads are