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:
after a LOCA to ensure that core cooling, containment integrity, and other vital safety functions are maintained. Provisions must also be included to minimize the probability of losing electric power from any of the remaining supplies as a result of, or coincident with, the loss of power generated by the nuclear power unit, the loss of power from the transmission network, or the loss of power from the onsite electric power supplies. GDC 17 also requires that the onsite power supplies and the onsite electrical distribution system have sufficient independence, redundancy, and testability to perform their safety functions, assuming a single failure. Therefore, no single failure will prevent the onsite power system from supplying electric power, thereby enabling safety functions and other vital functions that require electric power to be performed after any single failure in the power system. This SRP section cites RGs 1.6, 1.32, 1.53, 1.75, 1.128, and 1.153 as establishing acceptable guidance for meeting the requirements of GDC 17. SRP Sections 8.1, 8.2, 8.3.1, and 8.4 include additional information related to the review of compliance with GDC 17. 8.3.2-11 Revision 4 - May 2010 Meeting the requirements of GDC 17 provides assurance that a reliable dc power supply will be provided for all facility operating modes, including anticipated operational occurrences and design-basis accidents, to permit the performance of safety functions and other vital functions, even in the event of a single failure. 5. Compliance with GDC 18 requires that electric power systems important to safety be designed to permit appropriate periodic inspection and testing of key areas and features to assess their continuity and the condition of their components. These systems shall be designed to test periodically (a) the operability and functional performance of the components of the systems, such as onsite power sources, relays, switches, and buses, and (b) the operability of the systems as a