Document: NUREG-0800
Document ID: 1f39c574-c7ef-40fa-80ba-d9a8d86263f0
Document Type: srp
Title: 8.4
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070496.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
e failure: GDC 17 Staff Interpretation Criterion 17--Electric power systems. An onsite electric power system and an offsite electric power system shall be provided to permit functioning of structures, systems, and components important to safety. The safety function for each system (assuming the other system is not functioning) shall be to provide sufficient capacity and capability to assure that (1) specified acceptable fuel design limits and design conditions of the reactor coolant pressure boundary are not exceeded as a result of anticipated operational occurrences and (2) the core is cooled and containment integrity and other vital functions are maintained in the event of postulated accidents. a. An offsite power system and an onsite power system shall be provided, each independent of the other and capable of providing power for all safety functions. [The offsite and onsite power systems considered together must meet the single failure criterion on a system basis without loss of capability to provide power for all safety functions; additionally, in view of requirement (b) below, the two systems considered together must be capable of sustaining a double failure, one of which is complete loss of offsite power, without loss capability to provide power for the minimum required safety functions.] The onsite electric power supplies, including the batteries, and the onsite electric distribution system, shall have sufficient independence, redundancy, and testability to perform their safety functions assuming a single failure. b. The complete onsite electric power system (Class 1E) must be capable of sustaining a single failure without loss of capability to provide power for the minimum required safety function. Electric power from the transmission network to the onsite electric distribution system shall be supplied by two physically independent circuits (not necessarily on separate rights of way) designed and located so as to minimize to the extent practical the