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:
iodic Testing of Electric Power and Protection Systems,” (Ref. 23) which endorses IEEE Std. 338, with clarifications. • RG 1.75, “Criteria for Independence of Electrical Safety Systems,” (Ref. 24) which endorses IEEE Std. 384, with clarifications. • RG 1.9, “Application and Testing of Safety-Related Diesel Generators in Nuclear Power Plants,” (Ref. 25) which endorses IEEE Std. 387, with clarifications. • RG 1.129, “Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Production and Utilization Facilities,” (Ref. 26) which endorses IEEE Std. 450, with clarifications. • RG 1.128, “Installation Design and Installation of Vented Lead-Acid Storage Batteries for Nuclear Power Plants,” (Ref. 27) which endorses IEEE Std. 484, with clarifications. • RG 1.212, Sizing of Large Lead-Acid Storage Batteries,” (Ref. 28) which endorses IEEE Std. 485, with clarifications. • RG 1.158, “Qualification of Safety-Related Lead Storage Batteries for Nuclear Power Plants,” (Ref. 29) which endorses IEEE Std. 535, with clarifications. • RG 1.238, “Criteria for the Protection of Class 1E Power Systems and Equipment for Nuclear Power Plants,” (Ref. 30) which endorses IEEE Std. 741, with clarifications. 2. This RG does not endorse Section 7.3 of IEEE Std. 308-2020, which states, “Class 1E dc systems shall not be shared in multi-unit stations unless it can be shown that such sharing will not impair DG-1420, Page 7 their ability to perform their safety function.” Regulatory Guide 1.81, “Shared Emergency and Shutdown Electric Systems for Multi-Unit Nuclear Power Plants,” states that dc power systems in multi-unit nuclear power plants should not be shared. Consistent with RG 1.81, the NRC does not endorse the IEEE Std. 308-2020 criteria for sharing safety-related dc power systems in multi- unit or multi-module nuclear power plants. 3. With the withdrawal of RG 1.41, its provisions for preoperational testing of load groups