Document: NUREG-0800
Document ID: 97120913-d26f-4324-ab62-22f3f5b73925
Document Type: srp
Title: and 8.3.2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600410.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
cur during power operation, the generator will continue rotating at synchronous speed by acting as a synchronous motor. Anti-motoring protective relaying for the main generator will open the generator output breaker after a time delay of at least 15 seconds, during which time the rotating generator will provide voltage support for the grid. When the generator output breaker trips, the plant distribution system utilizes backfeed from the grid to maintain power to the RCPs. Therefore, grid stability analyses should verify that the grid remains stable for a minimum of 3 seconds following a turbine trip to support the assumptions made in the safety analyses for the passive reactor designs, such as the AP1000. IEEE Std 308, as modified/supplemented by the regulatory positions of Regulatory Guide 1.32, establishes acceptable guidance for meeting the requirements of GDC 17. Meeting the requirements of GDC 17 provides assurance that a reliable electric power supply can 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 key areas and features to assess their continuity and the condition of their components. These systems shall be designed to test periodically: (1) the operability and functional performance of the components of the offsite power systems, such as onsite power sources, relays, 8.2-12 Revision 4 - March 2007 switches, circuit breakers, 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