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:
onsible for the review of applications to construct and oera nuclear power plants. Thes documents are made available to the public as part of the Commission's policy to Inform the nuclear Industry and the general public of regulatory procedures and policies. Standard review plans amr not substitutes for regulato guides or the Commission's regulations and compliance with them Is not required. The atandard review plan sections are keyed to the Standard Format and Content of Safety Analysi Reports for Nuclear Power Plants. Not all sections of the Standard Format have a corresponding review plan. Published standard review plans will be revised pedodlcally. as appropriate, to accommodate comments and to reflect new Informa- tion and experience. Comments and suggestions for Improvement will be considered and should be sent to the U.S. Nuclear Regulatory Commission. Office of Nuclear Reactor Regulation, Washington, D.C. 2 2. Conformance with the Single Failure Criterion In determining the adequacy of this system to meet the single failure criterion, the electrical and physical separation of redundant power sources and associated distribution systems are examined to assess the independence between redundant portions of the system. This will include a review of the interconnections between redundant buses, buses and loads, and buses and power supplies; proposed sharing of the d-c power system between units at the same site; the design criteria and bases governing the installation of electrical cable for redundant portions of the systems; and physical arrangement of redundant switchgear and power supplies. 3. Power Supplies Design information and analyses demonstrating the suitability of batteries and battery chargers as d-c power supplies and inverters that convert d-c to a-c for instrumentation and control power are reviewed to assure that they have sufficient capacity and capability to perform their intended functions. This will require an examination of the