Document: NUREG-0800
Document ID: 9cfc38bf-7808-446e-a43d-4ca9ff55df2a
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740289.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
cedure is complete. The reviewer will select material from the procedures described below, as may be appropriate for a particular case. 8.3.1-20 Revision 4 - May 2010 These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant=s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. System Redundancy Requirements GDCs 33, 34, 35, 38, 41, and 44 set forth requirements with regard to the safety systems that must be supplied by the onsite ac 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 GDCs. As endorsed by RG 1.153, IEEE Std 603 provides criteria used to evaluate all aspects of the electrical portions of safety-related systems and the onsite power system, including criteria addressing redundancy, and IEEE-279 provides criteria for protection systems, with applicability determined by the date of issuance of the CP as described in 10 CFR 50.55a(h). The descriptive information, including electrical single-line diagrams, physical arrangement drawings, and electrical control and schematics, 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 distributed between redundant distribution systems and that the instrumentation and control devices for the Class 1E loads and power system are supplied from the related