Document: NRC Regulatory Guide
Document ID: dfb24267-98c5-442f-8325-3b1dee97bc46
Document Type: regulatory_guide
Title: Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Production and Utilization Facilities + HISTORY – HISTORY 08/2022 – DG-1401 , Proposed Revision 4 03/2013 – DG-1269 , Proposed Revision 3 10/2006 – DG-1155 , Proposed Revision 2 Prior to the issuance of DG-1155, RG 1.129 was entitled "Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Nuclear Power Plants" (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2202/ML22026A441.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.129
CFR Part: 
CFR Title: 

Content:
functional performance of the components of large lead-acid storage battery systems, subject to the following regulatory positions: 1. Section 2, “Normative References,” of the IEEE Std. 450-2020 recommended practices should be supplemented with the following: RG 1.32, “Criteria for Power Systems for Nuclear Power Plants” (Ref. 17). 2. Section 3.1, “Definitions,” of the IEEE Std. 450-2020 recommended practices should be replaced with the following: Critical period: That portion of the duty cycle that is the most severe and/or the specified time period of the battery duty cycle that is most severe. This critical period could be during the period of maximum current and/or during the most challenging period of the duty cycle identified during sizing of the battery, in accordance with RG 1.212. 3. Section 5.2.1, “Inspections,” of the IEEE Std. 450-2020 recommended practices should be supplemented with the following: For safety-related or Class 1E batteries, battery float current and voltage should be measured and recorded weekly. Where reference is made to the pilot cell, when using float current monitoring to indicate a fully charged condition, the pilot cell should be based on the lowest voltage cell(s) in the battery, and the frequency of specific gravity measurements should be reduced so as to not over-sample the cell(s). When using specific gravity measurements to indicate a fully charged condition, the pilot cell(s) should have an individual cell voltage (ICV) equal to the average of all ICVs of the battery to allow for rotating pilot cells annually so that no one cell is over-sampled. 4. Section 5.4.2, “State-of-Charge Indicator,” of the IEEE Std. 450-2020 recommended practices should be supplemented with the following: For safety-related or Class 1E batteries, the manufacturer should be consulted in determining the appropriate current monitoring method, voltage level, charging current range, and charge duration to ensure optimal battery