Document: NRC Regulatory Guide
Document ID: 15cbf11f-c04b-4bb6-884d-d72a942f44a7
Document Type: regulatory_guide
Title: Electric Penetration Assemblies in Containment Structures for Nuclear Power Plants + HISTORY - HISTORY 12/2025 ‐ Periodic Review of Revision 3 ‐ Revise 12/2021 ‐ Periodic Review of Revision 3 ‐ No issues identified 04/2017 – Periodic Review of Revision 3 – Issues identified for future consideration 11/2011 – Periodic Review of Revision 3 – No issues identified 06/1986 – Draft EE 405-4, Proposed Revision 3 (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2534/ML25342A020.pdf
Revision Date: 2025-12
Chapter: 
Section ID: RG-1.63
CFR Part: 
CFR Title: 

Content:
compliance with Title 10 of the Code of Federal Regulations Section 50.49 (10 CFR 50.49), “Environmental Qualification of Electric Equipment Important to Safety for Nuclear Power Plants.” RG 1.89, Rev. 2 was issued in 2023 by the NRC (ML22272A602). RG 1.89, Rev. 2, endorses the joint standard IEC/IEEE Std. 60780-323:2016, Edition 1. Due to the technical nexus between RG 1.89 and RG 1.63, RG 1.63 should be updated for technical and regulatory consistency between the RGs that discuss environmental qualification. 2. What is the impact on internal and external stakeholders of not updating the RG for the known issues, in terms of anticipated numbers of licensing and inspection activities over the next several years? Based on the staff’s review, RG 1.63, Rev.3 remains valid, and the use of the current revision of RG 1.63 will have no known impact on internal or external stakeholders at this time. However, the impact of not updating RG 1.63 increases the potential for technical or regulatory challenges because different versions of IEEE standards on environmental qualification are referenced in NRC guidance. 3. What is an estimate of the level of effort needed to address identified issues in terms of full-time equivalent (FTE) and contractor resources? 0.5 FTE and no contractor resources. 4. Based on the answers to the questions above, what is the staff action for this guide (Reviewed with no issues identified, Reviewed with issues identified for future consideration, Revise, or Withdraw)? Revise. 5. Provide a conceptual plan and timeframe to address the issues identified during the review. The staff plans to update RG 1.63, Revision 3 and anticipates that the draft guide will be issued for public comment in 2026. REFERENCES IEEE Std. 317-2025, “IEEE Standard for Electric Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations” NOTE: This review was conducted in September 2025 and reflects the staff’s plans as of that date. These