Document: NUREG-0800
Document ID: 81256f55-72dd-4777-9472-f373c71c4554
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550065.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
ite power system. 8.3.1-2 Revision 3 - March 2007 This SRP revision incorporates considerations for the review of the electric power system design brought about by the new advanced light water reactor (ALWR) designs, including evolutionary plant designs, such as the advanced boiling water reactor (ABWR) and the System 80+, and passive plant designs, such as the AP1000. The passive light water reactor design applications provide passive safety systems that do not need Class 1E ac electric power, other than that provided by the Class 1E direct current (dc) batteries and their inverters, to accomplish the plant's safety-related functions for 72 hours. References are provided in the individual SRP sections identifying regulatory documentation, such as SECY-94-084 and Regulatory Guide 1.206, that specifically address the unique design requirements and review considerations applicable to the ALWR plant designs. The specific areas of review are as follows: 1. System Redundancy Requirements The onsite power system is reviewed to determine that the required redundancy of safety-related components and systems is provided such that a system safety function can be accomplished assuming a single failure. This includes an examination of the ac power system configuration, including the power supplies, power supply feeders, switchgear arrangement, loads supplied from each bus, and power connections to the instrumentation and control devices of the power system. 2. Conformance with the Single Failure Criterion In establishing the adequacy of this system to meet the single failure criterion, both electrical and physical separation of redundant power sources and associated distribution systems are examined to assess the independence of redundant portions of the system. This will include a review of interconnections of redundant buses, buses and loads, and buses and power supplies; physical arrangement of redundant switchgear and power supplies; criteria and bases governing the