Document: NRC Regulatory Guide
Document ID: 7ff7fac8-958f-48d8-82dd-0c18b1b6e487
Document Type: regulatory_guide
Title: Installation Design and Installation of Vented Lead-Acid Storage Batteries for Nuclear Power Plants + HISTORY – HISTORY 01/2024 – DG-1421 , Proposed Revision 3 10/2006 – DG-1154 , Proposed Revision 2 Prior to the issuance of DG-1154, RG 1.128 was entitled "Installation Design and Installation of Large Lead Storage Batteries for Nuclear Power Plants" (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2327/ML23277A276.pdf
Revision Date: 2024-01
Chapter: 
Section ID: RG-1.128
CFR Part: 
CFR Title: 

Content:
the ability for cell plates to be inspected. 6. Section 5.4, “Seismic,” should be supplemented to add the following item: d) For nuclear power plants’ Class 1E batteries, the racks, anchors, and installation thereof should be able to withstand the force calculated for a safe shutdown earthquake to allow continuous battery service during and following the event in accordance with RG 1.100. DG-1421, Page 8 7. Section 5.5, “Ventilation,” should be replaced with the following: The battery area should be ventilated, either by a natural or mechanical ventilation system, to help prevent dangerous concentrations of hydrogen. Battery room ventilation systems should be capable of maintaining the hydrogen concentration well below 2 percent, by volume and should be separated from each other and from other areas of the plant by barriers having a minimum fire rating of 3 hours inclusive of all penetrations and openings, as recommended in RG 1.189. The NRC staff reviewed IEEE Std. 1635/ASHRAE Guideline 21 and found that the guide contained additional technical information and criteria useful for ventilation and thermal management of batteries for stationary applications. This revision of RG 1.128 does not endorse IEEE Std. 1635/ASHRAE Guideline 21. 8. Section 5.6, “Instrumentations and Alarms,” should be supplemented with the following: e) Ventilation flow sensor(s) and alarm(s) in the control room. f) Fire detection sensor(s), instrumentation, and alarm(s) in the control room and locally, as recommended by RG 1.189. 9. Section 6.4.1, “Freshening charge sequence,” item b, should be supplemented with the following: Consistent with RG 1.129, 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