Qualification of Safety-Related Lead Storage Batteries for Nuclear Power Plants

The U.S. Nuclear Regulatory Commission (NRC) is issuing Revision 1 to Regulatory Guide (RG) 1.158, ``Qualification of Safety- Related Vented Lead-Acid Storage Batteries for Nuclear Power Plants.'' RG 1.158 endorses (with clarifying regulatory positions) the Institute of Electrical and Electronics Engineers (IEEE) Standard (Std.) 535- 2013, ``IEEE Standard for Qualification of Class 1E Vented Lead Acid Storage Batteries for Nuclear Power Generating Stations.'' IEEE 535- 2013 contains procedures for qualifying batteries with duty cycles of less than 8 hours and also for batteries with duty cycles longer than 8 hours.