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:
formed in the event of any single failure in the power system. Guidance on the application of the single-failure criterion is provided in Regulatory Guide 1.53, with applicability as established in 10 CFR 50.55a(h). SRP Section 8.3.1 cites Regulatory Guides 1.6, 1.9, 1.32, 1.75, 1.153, and 1.155, and NUREG/CR-0660 as establishing acceptable guidance for meeting the requirements of GDC 17. Meeting the requirements of GDC 17 provides assurance that a reliable electric power supply will be provided for all facility operating modes, including anticipated operational occurrences and design basis accidents to permit safety functions and other vital functions to be performed, even in the event of a single failure. 5. Compliance with GDC 18 requires that electric power systems important to safety be designed to permit appropriate periodic inspection and testing of important areas and features to assess the continuity of the systems and the condition of their components. These systems shall be designed with a capability to test periodically: (1) the operability and functional performance of the components of the systems, such as onsite power sources, relays, switches, and buses, and (2) the operability of the systems as a whole and, under conditions as close to design as practical, the full operational sequence that brings the systems into operation, including operation of applicable portions of the protection system, and the transfer of power among the nuclear power unit, the offsite power system, and the onsite power system. Accordingly, the ac power system should provide the capability to perform integral testing of Class 1E systems on a periodic basis. Regulatory Guides 1.9, 1.32, 1.47, 1.118, and 1.153 and Branch Technical Position 8-5 are cited in SRP Section 8.3.1 as establishing acceptable guidance for meeting the requirements of this criterion. Meeting the requirements of GDC 18 provides assurance that, when necessary, offsite power systems can be appropriately and