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:
Regulatory Guide Number: 1.63, Revision 3 Title: Electric Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations Office/division/branch: NRR/DEX/EEEB Technical Lead: Sheila Ray Staff Action Decided: Revise 1. What are the known technical or regulatory issues with the current version of the Regulatory Guide (RG)? RG 1.63, Revision 3 (Rev. 3), “Electric Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations,” issued in February 1987, provides a method acceptable to NRC staff for complying with the agency’s regulations for the design, construction, testing, qualification, and installation of electric penetration assemblies in containment structures in nuclear power plants. The current version of RG 1.63 endorses the Institute of Electrical and Electronic Engineers (IEEE) Standard (Std.) 317-1983, “IEEE Standard for the Electric Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations” with a clarification. IEEE Std. 317 has been revised in 2013 and 2025, and the current version IEEE Std. 317-2025 has been published. The staff reviewed both the 2013 and 2025 versions and noted some major changes, additions, and clarifications. Specifically, IEEE Std. 317-2025 references the latest standards on environmental qualification, including the joint logo standard International Electrotechnical Commission (IEC)/IEEE Std. 60780-323:2016, Edition 1, “Nuclear facilities -- Electrical equipment important to safety – Qualification.” In addition, IEEE Std. 317-2025 updated the definitions and considered small modular reactors. RG 1.63 complements RG 1.89, “Environmental Qualification of Certain Electric Equipment Important to Safety for Nuclear Power Plants,” which addresses 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,