Document: NUREG-0800
Document ID: 9fa7092c-7628-402d-9028-6601d5f5fdfb
Document Type: srp
Title: DC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550063.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
val, containment atmosphere cleanup, and cooling water for SSCs important to safety. These systems must be available during normal and accident conditions, as required by 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. In addition, redundant safety loads must be distributed between redundant distribution systems, and associated redundant distribution systems must supply the instrumentation and control devices for the Class 1E loads and power system. For the dc power system, these requirements are met if the minimum design required by GDC 17 is provided. 8.3.2-12 Revision 3 - March 2007 Meeting the requirements of these criteria, as encompassed by GDC 17, provides assurance that required dc 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. 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. Containment electric penetrations must therefore be designed to accommodate, without exceeding their design leakage rate, the calculated pressure and temperature conditions resulting from a LOCA. This criterion, as it applies to this SRP section, relates specifically to ensuring the integrity of containment electrical penetrations in the event of