Document: NUREG-0800
Document ID: 9cfc38bf-7808-446e-a43d-4ca9ff55df2a
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740289.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
d 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 8.3.1-17 Revision 4 - May 2010 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 DBAs so that the safety functions required by these criteria may be performed, even in the event of any single failure. 7. Compliance with GDC 50 requires that the reactor containment structure, including access openings, penetrations, and containment heat removal systems, be designed so that the containment structure and its internal compartments can accommodate, without exceeding the design leakage rate and with sufficient margin, the calculated pressure and temperature conditions resulting from any LOCA. Accordingly, containment electric penetrations should be designed to accommodate, without