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:
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 performance. Also, vendor recommendations may be considered for determining these parameters. 5. Section 5.5, “Float Current Indications and Interpretations,” of the IEEE Std. 450-2020 recommended practices should be supplemented with the following: For safety-related or Class 1E batteries, the use of stabilized charging current or the three-time constant method described in NUREG/CR-7148 to determine a fully charged condition should be limited to lead-calcium batteries, and the use of stabilized charging DG-1401, Page 8 current should be verified by measurement during charging. As there is wide variation in the initial and end charging currents, the instrumentation used to measure charging currents should have the appropriate range and sensitivity. 6. Section 6, “Test Schedule,” of the IEEE Std. 450-2020 recommended practices should be supplemented with the following: For safety-related or Class 1E batteries, when the battery service test discussed in Section 6.4, “Service,” and described in Section 7.6, “Service Test,” and the battery performance test discussed in Section 6.3, “Performance,” and described in Section 7.4, “Capacity Test Methods,” are scheduled to be performed in the same year, both tests should be performed. The battery service test should be performed every refuel outage and should not exceed 24 months. 7. Section 6.5, “Modified Performance Test,” of the IEEE Std. 450-2020 recommended practices now state, in the last paragraph, that a modified performance test can be used in lieu of a service test and/or a performance test at any time. If the battery has been sized in accordance with RG 1.212, which endorses IEEE Std. 485, then the battery is acceptable if it delivers a tested capacity of 80 percent or greater. This