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:
al Design Criteria 34, 35, 38, 41, and 44 require that safety system redundancy shall be such that, for preferred power system operation (if standby power is not available), the system safety function can be accomplished, assuming a single failure. For passive reactor design applications, such as the AP 1000, the potential risk contribution of design basis event is minimized by not requiring ac power sources for design-basis events. Passive reactor designs incorporate passive safety-related systems for core cooling and containment integrity, and therefore, do not depend on the electric power grid connection and grid stability for safe operation. They are designed to automatically establish and maintain safe shutdown conditions after design basis events for 72 hours, without operator action, following a loss of both onsite and offsite ac power sources. Consequently, passive reactor designs are not required to meet the requirements of GDCs 33, 34, 35, 38, 41, and 44 for 72 hours. Meeting the requirements of these criteria as encompassed by GDC 17 provides assurance that required electric power can 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. 8.2-13 Revision 4 - March 2007 7. 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. An acceptable means of complying with 10 CFR 50.63 requirements involves the provision of an alternate ac (AAC) source (as defined in 10 CFR 50.2) of sufficient capacity, capability, and reliability for operation of