Document: NUREG-0800
Document ID: f9d2d9cb-1d13-407e-ad7a-523fff64de06
Document Type: srp
Title: DC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740391.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
ystem 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. 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. 8.3.2-12 Revision 4 - May 2010 7. Compliance with GDC 50 requires that the reactor containment structureCincluding access openings, penetrations, and containment heat removal systemsCbe 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 design-basis LOCA conditions. This SRP section cites RG 1.63 as guidance acceptable to the staff for meeting the requirements of this criterion. Meeting the requirements of GDC 50 provides assurance that a LOCA will not cause a containment structure, including its electrical penetrations, to exceed