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:
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 PMIDs, and physical arrangement drawings and are confirmed during a visit to the site. To assure 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 assure that this review procedure is complete. 1. Sstem Redundancy Requirements GU 3.3, 34, 35, 38, 41, and 44 set forth requirements with regard to safety-related systems that must be supplied by the onsite (a-c and d-c) power systems. Also, these criteria state that safety-related system redundancy shall be such that for onsite power system operation (assuming offsite power is not available) the system safety function can be accom- plished assuming a single failure. The acceptability of the onsite d-c power system with regard to redundancy is based on conformance to the same degree of redundancy required of safety-related components and systems required by these GDC. The descriptive information including electrical single line diagrams (CP and OL stages), functional P&IDs (CP and OL stages), and electrical schematics (OL stage) is reviewed to verify that this redundancy is reflected in the d-c power system with regard to both power sources and associated distribution systems. Also, it is verified in coordination with other branches that redundant safety- related loads are distributed between redundant distribution systems, and that the instrumentation and control devices for the safety-related loads and power system are supplied from the related