Document: NRC Regulatory Guide
Document ID: d9cc810b-2b66-41ff-aa66-9378ca993586
Document Type: regulatory_guide
Title: Sizing of Large Lead-Acid Storage Batteries (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2311/ML23118A344.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.212
CFR Part: 
CFR Title: 

Content:
lve-regulated lead-acid batteries and also describes some factors relating to cell selection. However, consideration of battery types other than lead acid is beyond the scope of this RG. Additionally, installation, maintenance, qualification, testing procedures, and design of the dc system and sizing of the battery charger(s) are beyond the scope of the IEEE standard and this RG. It is important to recognize that IEEE Std. 485-2020 states it can be used as a standalone document. However, the NRC staff has found that using IEEE Std. 485-2020 in conjunction with IEEE Std. 450 and IEEE Std. 484 provides the user with a general guide to the design, installation, and maintenance of vented lead-acid batteries. In addition, the staff notes that IEEE/American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) 1635-2022, “Guide for the Ventilation and Thermal Management of Batteries for Stationary Applications,” (Ref. 13) provides helpful ventilation calculations that are associated with IEEE Standard 484. For the design, installation, and maintenance of valve-regulated lead-acid (VRLA) batteries, the NRC staff reviewed IEEE Std. 1187, “IEEE Recommended Practice for Installation Design and Installation of Valve-Regulated Lead-Acid Storage Batteries for Stationary Applications” (Ref. 14), and IEEE Std. 1188, “IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications” (Ref. 15), and found that the standards provide additional information and criteria for VRLA battery users. The sizing methodology in IEEE Std. 485-2020 is very similar to that in IEEE Std. 485-2010. The approach consists of defining the load that the batteries will be required to support and using the guidance in the IEEE standard to determine the best battery for the application. To this end, IEEE Std. 485-2020 provides guidance on general considerations that should be included in defining the