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Provides results of investigation into function of D cell batteries in uninterruptible power supplies.Batteries provide redundant power sources to operate control logic should power output from 20 C dc power supplies be degraded.

Accession Number: ML17056B556

Date Released: Saturday, November 7, 2020

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• ML17056B555 - Provides results of investigation into function of D cell batteries in uninterruptible power supplies.Batteries provide redundant power sources to operate control logic should power output from 20 C dc power supplies be degraded. (4 page(s), 11/27/1991)
• ML17056B557 - Responds to 911023 ltr indicating disagreement between NRC & util re function of "D" cell batteries in facility UPS units which lost output power in 910813 event. (22 page(s), 11/27/1991)
• ML17056B558 - Requests that F Ashe & T Pohida reexamine technical area of disagreement re function of internal control logic batteries. (2 page(s), 10/23/1991)