Document: NUREG-0800
Document ID: a2680f96-0e15-402d-89ab-688ff09806a8
Document Type: srp
Title: with respect to the specified station blackout event/duration.13
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070497.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
peration (if standby power is not available), the system safety function can be accomplished using the piping, pumps, and valves to maintain coolant inventory during normal reactor operations. For the offsite power system, these requirements are met if the minimum design required by GDC 17 is provided. Meeting the requirements of these criteria as encompassed by GDC 17 provides assurance that required electric power will be provided for all facility operating modes, including transients and design basis accidents so that the safety functions required in these criteria may be performed, even in the event of any single failure.56 5. Compliance with 10 CFR 50.63 requires that each light-water-cooled nuclear power plant be able to withstand or cope with, and recover from a station blackout. As required by 10 CFR 50.63, electrical systems that are necessary support systems for station blackout must be of sufficient capability and capacity to ensure that core cooling and appropriate containment integrity are maintained in the event of a station blackout. One acceptable means of complying with 10 CFR 50.63 requirements involves the provision of an 8.2-9 DRAFT Rev. 4 - April 1996 alternate ac (AAC) source (as defined in 10 CFR 50.2) of sufficient capacity, capability, and reliability for operation of all systems required for coping with station blackout and for the time required to bring and maintain the plant in safe shutdown (non-design basis accident) that will be available on a sufficiently timely basis. 10 CFR 50.63 also requires (through citation of the definition of AAC source in 10 CFR 50.2) minimum potential for common mode failure (i.e., acceptable independence) between any AAC power source used for station blackout and the offsite power system or onsite power sources. Electrical ties between these systems, as well as the physical arrangement of their interface equipment, must not prevent the use of any AAC power source during loss of the offsite power system