Document: NUREG-0800
Document ID: 81256f55-72dd-4777-9472-f373c71c4554
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550065.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
ety function assuming a single failure; and (c) provisions 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 or the loss of power from the transmission network. Acceptability was based on the applicant meeting the positions of Regulatory Guides 1.6, 1.9, 1.32, 1.75, 1.153, 1.155, 1.204, and NUREG/CR-0660. 5. The applicant has met the requirements of GDC 18, "Inspection and Testing of Electric Power Systems," with respect to the onsite Class 1E ac power system. The ac power system is designed to be testable during operation of the nuclear power generating station as well as during those intervals when the station is shut down. This meets the positions of Regulatory Guide 1.118. 6. The applicant has met the requirements of GDC 50, "Containment Design Bases," with respect to penetrations containing circuits of the safety and non-safety ac power system. Containment electric penetrations have been designed to withstand all ranges of over load and short circuit currents up to the maximum fault current vs time conditions that could occur given single random failures of protective devices. Also, for each electrical penetration, the applicant has provided redundant circuit breakers/fuses to assure containment integrity. This meets the positions of Regulatory Guide 1.63. 7. The applicant has met the requirements of 10 CFR 50.63, "Loss of All Alternating Current Power," with respect to appropriate use of the redundancy and reliability of emergency onsite ac power sources as factors in determining an appropriate station blackout duration for which the plant should be capable of withstanding or coping with, and recovering from. The applicant has committed to suitable target reliability levels for emergency onsite ac power sources and a program that provides reasonable assurance that reliability targets will be 8.3.1-36 Revision 3 - March 2007 achieved