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:
inuous, highly reliable source of ac supply. The review of the dc power system for the (name of plant) plant covered the single-line diagrams, station layout drawings, electrical control and schematic diagrams, and descriptive information. The basis for acceptance of the dc power system in the review was conformance of the design criteria and bases to the Commission=s regulations in 10 CFR 50.63 and the GDC of Appendix A to 10 CFR Part 50. The staff concludes that the plant design is acceptable and meets the requirements of GDCs 2, 4, 5, 17, 18, and 50 and of 10 CFR 50.63. This conclusion is based on the following: 1. The applicant has met the requirements of GDC 2 with respect to structures, systems, and components of the dc power systems that are capable of withstanding the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, and floods because the dc power system and components are located in seismic Category I structures, which provide protection from the effects of tornadoes, tornado missiles, and floods. In addition, the dc power system and components have a quality assurance designation of Class 1E. 2. The applicant has met the requirements of GDC 4 with respect to structures, systems, and components of the dc power system that are capable of withstanding the effects of missiles and environmental conditions associated with normal operation and postulated accidents because of an adequate plant design and an equipment qualification program. 3. The applicant has met the requirements of GDC 5 with respect to structures, systems, and components of the dc power system. Physically separate seismic Category I structures house the dc power system and components associated with the multi-unit design, and they are not shared between units. Acceptability was based on the applicant meeting Regulatory Position C.2.a of RG 1.32 and Regulatory Position C.1 of RG 1.81. 4. The applicant has met the requirements of GDC 17 with respect to the onsite dc power