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:
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 Nuclear Power Engineering Committee Working Group 4.1, “Class 1E Power Systems Working Group,” and was approved by the IEEE Standards Board on March 6, 2020. IEEE Std. 308-2020 provides (1) the principal design criteria and the design features for the safety-related power systems that enable the systems to meet their functional requirements under the conditions produced by the postulated design-basis events, (2) methods for tests and surveillance of the safety-related power systems, (3) criteria for sharing safety-related power systems in multi-unit nuclear power plants, and (4) provisions for documenting the safety-related power systems. Regarding harmonics and harmonic distortion, IEEE Std. 519, “IEEE Recommended Practice and Requirements for Harmonic Control in Electric Power Systems,” (Ref. 12) provides guidance in the design of power systems with nonlinear loads. IEEE Std. 1159, “IEEE Recommended Practice for Monitoring Electric Power Quality,” (Ref. 13) and IEEE Std. 1531, “IEEE Guide for the Application and Specification of Harmonic Filters,” (Ref. 14) provide additional information on monitoring power quality and harmonic filters, respectively. The NRC staff reviewed IEEE Standards 519, 1159, and 1531 and found that these documents contain information on power quality, harmonics, and harmonic filters; however, this revision of RG 1.32 does not endorse IEEE Std. 519, 1159, or 1531. Additionally, the NRC published Research Information Letter 2023-09, “An Assessment of the Harmonics Effects on Undervoltage Relays in Nuclear Power Plants” (Ref. 15) that contains information on the effects of harmonic distortion on electrical protection relay operation. DG-1420, Page 5 Consideration of International Standards The International Atomic Energy