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. |
| 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 |
| 43527 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
North Anna with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation | |
WEEKMONTHYEARENS 435272007-07-26T04:00:00026 July 2007 04:00:00
[Table view]10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 Notification - Failure of Enersys (Exide) Battery 2007-07-26T04:00:00 | |