Draft Regulatory Guide: Application and Testing of Onsite Emergency Alternating Current Power Sources in Production and Utilization Facilities

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Nuclear Regulatory Commission [NRC-2026-0826] ( printed page 33003) AGENCY: Nuclear Regulatory Commission. ACTION: Draft guide; request for comment. SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is issuing for public comment draft regulatory guide (DG), DG-1477, “Application and Testing of Onsite Emergency Alternating Current Power Sources in Production and Utilization Facilities.” This DG is proposed Revision 5 of Regulatory Guide (RG) 1.9 with a new title. The proposed revision to the RG provides guidance that the staff of the NRC considers acceptable to comply with the NRC regulations for onsite emergency alternating current (AC) power sources in production and utilization facilities. These power sources include emergency diesel generators (EDGs), combustion turbine generators (CTGs) and other types of onsite emergency AC power sources. DATES: Submit comments by July 2, 2026. Comments received after this date will be considered if it is practical to do so, but the NRC is able to ensure consideration only for comments received on or before this date. ADDRESSES: You may submit comments by any of the following methods; however, the NRC encourages electronic comment submission through the Federal rulemaking website: Federal rulemaking website: Go to https://www.regulations.gov and search for Docket ID NRC-2026-0826. Address questions about Docket IDs in Regulations.gov to Bridget Curran; telephone: 301-415-1003; email: Bridget.Curran@nrc.gov . For technical…