Document: NRC Regulatory Guide
Document ID: d940ffea-1d07-4cc8-b0f2-64d5495912d7
Document Type: regulatory_guide
Title: Criteria for Power Systems for Nuclear Power Plants + HISTORY - HISTORY DG-1420 , Proposed Revision 4, published 08/2024 DG-1079 , Proposed Revision 3, published 04/2003 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2415/ML24158A060.pdf
Revision Date: 2024-08
Chapter: 
Section ID: RG-1.32
CFR Part: 
CFR Title: 

Content:
information unless the document requesting or requiring the collection displays a currently valid OMB control number. DG-1420, Page 4 B. DISCUSSION Reason for Revision The NRC issued Revision 3 of RG 1.32, “Criteria for Power Systems for Nuclear Power Plants,” in March 2004 (Ref. 10). Revision 3 of RG 1.32 endorsed (with exception) IEEE Std. 308–2001, “Criteria for Class 1E Power Systems for Nuclear Power Generating Stations.” This revision of the guide (Revision 4) endorses, with exceptions and clarifications, IEEE Std. 308-2020, issued March 16, 2020, and incorporates the NRC’s implementation of risk-informed, performance-based approach to licensing. In addition, this RG also includes provisions of RG 1.41, “Preoperational Testing of Redundant On-Site Electric Power Systems to Verify Proper Load Group Assignments,” issued March 1973 (Ref. 11). RG 1.41 describes methods acceptable to the NRC for independence among redundant, onsite power sources and their load groups as part of the initial preoperational testing program and after major modifications or repairs. Because the provisions of RG 1.41 are being consolidated in this RG, RG 1.41 will be withdrawn with the issuance of RG 1.32 Revision 4. Background This RG describes a method acceptable to the NRC staff for complying with the agency’s regulations for the design, operation, and testing of electric power systems in nuclear power plants. Specifically, it provides guidance for meeting the GDC for the portions of systems and equipment in the AC power systems, DC power systems, and instrumentation and control power systems that are important to safety. For onsite emergency power systems designed in accordance with RG 1.6 and RG 1.32 (Safety Guides 6 and 32), this guide describes an acceptable method of complying with the Commission’s regulations with respect to verifying the proper assignments of redundant load groups to the related onsite power sources. IEEE Std. 308-2020 was prepared by IEEE