ENS 52558: Difference between revisions
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StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
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| event date = 02/16/2017 13:20 EST | | event date = 02/16/2017 13:20 EST | ||
| last update date = 02/16/2017 | | last update date = 02/16/2017 | ||
| title = Unexpected Autostart | | title = Unexpected Autostart of an Emergency Diesel Generator | ||
| event text = On February 16, 2017 at 1320 EST, the 2A Emergency Diesel Generator (EDG) started in response to a valid actuation signal due to the momentary loss of the 2C Startup Transformer (SAT). While performing maintenance activities on the 2D SAT, the alternate supply breaker tripped and reclosed, allowing the 4160 2E Emergency Bus to be momentarily de-energized. When the 4160 2E Emergency Bus de-energized, the 2A EDG received a valid autostart signal due to emergency bus low voltage. Although, the 2A EDG did autostart, it did not tie to the 4160 2E Emergency Bus as the 4160 2E Emergency Bus was re-energized from the 2C SAT. | | event text = On February 16, 2017 at 1320 EST, the 2A Emergency Diesel Generator (EDG) started in response to a valid actuation signal due to the momentary loss of the 2C Startup Transformer (SAT). While performing maintenance activities on the 2D SAT, the alternate supply breaker tripped and reclosed, allowing the 4160 2E Emergency Bus to be momentarily de-energized. When the 4160 2E Emergency Bus de-energized, the 2A EDG received a valid autostart signal due to emergency bus low voltage. Although, the 2A EDG did autostart, it did not tie to the 4160 2E Emergency Bus as the 4160 2E Emergency Bus was re-energized from the 2C SAT. | ||
This event is reportable per 10 CFR 50.72(b)(3)(iv)(A) since the autostart of the 2A EDG was not part of a pre-planned sequence and the event resulted in the valid actuation of an emergency ac electrical power system. | This event is reportable per 10 CFR 50.72(b)(3)(iv)(A) since the autostart of the 2A EDG was not part of a pre-planned sequence and the event resulted in the valid actuation of an emergency ac electrical power system. | ||
Latest revision as of 21:43, 1 March 2018
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-0.87 h-0.0363 days <br />-0.00518 weeks <br />-0.00119 months <br />) | |
| Opened: | Paul Underwood 17:28 Feb 16, 2017 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Feb 16, 2017 |
| 52558 - NRC Website
| |