NRC-2026-0826
Draft Regulatory Guide: Application and Testing of Onsite Emergency Alternating Current Power Sources in Production and Utilization Facilities
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.