Draft Regulatory Guide: Application and Testing of Onsite Emergency Alternating Current Power Sources in Production and Utilization Facilities
§ 01 Summary
NRC is issuing Draft Regulatory Guide DG-1477 for public comment as proposed Revision 5 to Regulatory Guide 1.9, addressing acceptable methods for applying and testing onsite emergency AC power sources at production and utilization facilities. The draft covers emergency diesel generators, combustion turbine generators, and other onsite emergency AC sources, but it is guidance and not a binding rule.
§ 02 Why this matters
The notice opens comment on draft NRC guidance describing acceptable compliance methods for onsite emergency AC power-source requirements, but it does not itself amend regulations or impose mandatory testing obligations. Any compliance impact would arise only if operators choose to rely on the finalized guide or NRC later incorporates it into licensing or inspection expectations.
§ 03 Topics
§ 04 Affected entities
- agency: Nuclear Regulatory Commission
- industry: nuclear-facility-operators
- statute: Atomic Energy Act
§ 05 Matching feeds
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§ 06 Source document
Read the full Federal Register entry on federalregister.gov.
Show classifier input (what GPT-5.5 saw)
Type: Notice Agencies: Nuclear Regulatory Commission Citation: 91 FR 33003 Title: Draft Regulatory Guide: Application and Testing of Onsite Emergency Alternating Current Power Sources in Production and Utilization Facilities Abstract: 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.
Classified Jun 2, 2026 by gpt-5.5. Fetched Jun 2, 2026.
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