ENS 48369
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ENS Event | |
|---|---|
12:43 Oct 3, 2012 | |
| Title | Failure of Startup Transformer Caused Undervoltage Condition on Essential Bus |
| Event Description | On October 3, 2012, with Unit 2 in a defueled condition, a failure occurred on the 2B Startup Transformer, causing an undervoltage condition on an essential bus and resulted in the automatic start and loading of the 2B Emergency Diesel Generator (EDG). Prior to the event, the 2B EDG was available and not required by Technical Specifications; however, the 2B EDG was inoperable. Additionally, the 2A EDG is available. All equipment responded as expected. Currently maintaining the plant in a defueled condition. Decay heat removal is being supplied by the 2A Fuel Pool Cooling train and was never interrupted. There was no impact on the Shutdown Safety Assessment.
This event is reportable pursuant to 10CFR50.72(b)(3)(iv)(A). Due to common high side feed, the loss of the 2B Startup Transformer resulted in the loss of the 1B Startup Transformer. Prior to the event, the 1A EDG was out of service for maintenance. As a result, Unit 1 entered Technical Specification 3.8.1.1 Action C. due to the loss of one offsite AC circuit and one diesel generator inoperable. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Saint Lucie  Florida (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-0.47 h-0.0196 days <br />-0.0028 weeks <br />-6.43806e-4 months <br />) | |
| Opened: | Andrew Terezakis 12:15 Oct 3, 2012 |
| NRC Officer: | John Knoke |
| Last Updated: | Oct 3, 2012 |
| 48369 - NRC Website
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WEEKMONTHYEARENS 560872022-09-03T02:48:0003 September 2022 02:48:00
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