ENS 43527

v t e ENS Event
04:00 Jul 26, 2007
Title	Part 21 Notification - Failure of Enersys (Exide) Battery
Event Description	In March 2005, battery cell internal resistance for an EDG battery bank revealed five cells with abnormal resistance. "There was one cell for which no reading could be obtained and was replaced immediately. A second cell had a reading that was nearly four times the average of the associated string and was subsequently replaced as a proactive measure during the EDG maintenance outage. Three (3) other cells were noted with higher than average readings that are not considered to be operability concerns. In total, five (5) cells out of a total of 240 were found with higher than expected internal resistance values. The failed battery was destructively tested revealing significant corrosion within the battery. The unit-2 batteries have been replaced. The unit-1 batteries will be replaced in the fall 2007 outage. Manufacturer: Enersys (Exide) Model: 3CA-5 Serial Number: beginning with 05 The licensee notified the NRC Resident Inspector.

ENS 43527 +/-
Where
North Anna Virginia (NRC Region 2)
Reporting

10 CFR 21.21
Time - Person (Reporting Time:+29.08 h1.212 days <br />0.173 weeks <br />0.0398 months <br />)
Opened:	Tom Shaub 09:05 Jul 27, 2007
NRC Officer:	Mark Abramovitz
Last Updated:	Jul 27, 2007
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v • d • e

v t e Emergency Notification System
North Anna with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation
WEEKMONTHYEAR2007-07-26T04:00:00 [Table view]
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