Document: NUREG-0800
Document ID: b351c30f-74b4-4d36-833e-939d23abae4e
Document Type: srp
Title: D-C POWER-SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350494.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
equirements of GDC 2, "Design Basis for Protection Against Natural Phenomena," with respect to structures, systems, and components of the d-c power systems being capable of withstanding the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, and floods as the d-c power system and compo- nents are located in seismic Category I structures which provides protection from the effects of tornadoes, tornado missiles, and floods. In addition, the-d-c power system and components have a quality assurance designation "Class 1E." 2. The applicant has met the requirements of GOC 4, "Environmental and Missile Design Bases," with respect tb structures, systems, and components of the d-c power system being capable of withstanding the effects of missiles and environmental conditions associated with normal operation and postulated accidents by adequate plant design and equipment qualification program. 3. The applicant has met the requirements of GDC 5, "Sharing of Structures, Systems, and Components," with.respect to structures, systems, and components of the d-c power system. The d-c power system and components associated with the multirunit design are housed in physically separate seismic Category I structures, and are not shared between units. Acceptability was based on the applicant meeting Regulatory Guide 1.32, position C.2.a, and guidelines of Regulatory Guide 1.81, position C.1. 4. The applicant has met the requirements of GDC 17, "Electric Power Systems," with respect to the onsite d-c power system's (a) capacity and capability to permit functioning of structures, systems, and components important to safety, (b) the Independence and redundancy to perform their safety 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.