Document: NRC Regulatory Guide
Document ID: f457ed0f-1a93-47d5-a311-511c0346447e
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:
does not include endorsement of this annex. 4. Annex D to IEEE Std. 485-2020 is informative and provides a method for sizing a battery properly for a constant power application and for converting from either constant power loads or constant resistance loads to constant current. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex. 5. Annex E to IEEE Std. 485-2020 is informative and provides a method for describing the construction and use of the battery discharge characteristics curve. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex. 6. Annex F to IEEE Std. 485-2020 is informative and provides a method for addressing random loads and their application in the battery sizing process. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex. 7. Annex G to IEEE Std. 485-2020 is a full-size worksheet, “Sizing Lead-Acid Batteries for Stationary Applications,” and is endorsed as an accepted method for sizing lead-acid batteries. 8. Annex H to IEEE Std. 485-2020 is informative and provides the bibliography. Unless otherwise stated in a separate regulatory position, endorsement of IEEE Std. 485-2020 does not include endorsement of this annex. 9. The safety analysis report should discuss the battery duty cycle span. For active designs, the battery duty cycle should cover both DBA and SBO scenarios (with a permitted load shedding scheme). The minimum duty cycle for active designs for DBAs should be 2 hours. RG 1.212, Rev. 2, Page 8 D. IMPLEMENTATION The NRC staff may use this regulatory guide as a reference in its regulatory processes, such as licensing, inspection, or enforcement. However, the NRC staff does not intend to use the guidance in this RG to support NRC staff actions in a manner that would constitute backfitting as