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:
ablishing 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 unobtrusively accessed for required periodic inspection and testing, enabling verification of important system parameters, performance characteristics, and features and detection of degradation and/or impending failure under controlled conditions. 8.3.1-17 Revision 3 - March 2007 6. GDCs 33, 34, 35, 38, 41, and 44 set forth requirements for the safety systems for which the access to both offsite and onsite power sources must be provided. Accordingly, capability should be provided for reactor coolant makeup during small breaks, residual heat removal, emergency core cooling, containment heat removal, containment atmosphere cleanup, and cooling water for SSCs important to safety. These systems should be available during normal and accident conditions, as necessary for the specific system. GDCs 33, 34, 35, 38, 41, and 44 require safety system redundancy such that, for onsite power system operation (assuming offsite power is unavailable), the system safety function can be accomplished, assuming a single failure. Redundancy must be reflected in the standby power system with regard to both power sources and associated distribution systems. Also, redundant safety loads should be distributed between redundant distribution systems, and the instrumentation and control devices for the Class 1E loads and power system should be supplied from associated redundant distribution systems. For the ac power system, these requirements are met if the minimum design required by GDC 17 is provided. Meeting these criteria as encompassed by GDC 17 provides assurance that necessary electric power will be provided for all facility operating modes, including transients and design basis accidents so that the safety functions required by these criteria may be performed, even in the event of any