Document: NRC Regulatory Guide
Document ID: 1731a882-b0c5-418d-b65e-55646c26be5c
Document Type: regulatory_guide
Title: 03/2007
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0703/ML070380553.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.9
CFR Part: 
CFR Title: 

Content:
spection and testing to assess the continuity of the systems and the condition of their components. Criterion III, “Design Control,” and Criterion XI, “Test Control,” of Appendix B, “Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants,” to 10 CFR Part 50 require that (1) measures be provided for verifying or checking the adequacy of design through design reviews, the use of alternative or simplified calculational methods, or the performance of a suitable testing program and (2) a test program be established to ensure that systems and components perform satisfactorily and that the test program include operational tests during nuclear power plant operation. Rev. 4 of RG 1.9, Page 2 10 CFR 50.63, “Loss of All Alternating Current Power,” requires that each light-water-cooled nuclear power plant must be able to withstand and recover from a station blackout [i.e., loss of offsite and onsite emergency alternating current (ac) power systems] for a specified duration. The reliability of onsite ac power sources is one of the main factors contributing to the risk of core melt as a result of a station blackout. Most onsite electric power systems use diesel generators as the chosen onsite emergency power source. This regulatory guide provides guidance that the staff of the U.S. Nuclear Regulatory Commission (NRC) considers acceptable to comply with the Commission’s regulations for safety-related diesel generators intended for use as onsite emergency power sources in nuclear power plants — specifically, that the emergency diesel generators be selected with sufficient capacity, be qualified, and have the necessary reliability and availability for design-basis events. This regulatory guide relates to information collections that are covered by the requirements of 10 CFR Part 50 and 10 CFR Part 21, “Reporting of Defects and Noncompliance” (Ref. 2), which the Office of Management and Budget (OMB) approved under OMB control number