ENS 52169: Difference between revisions
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| event date = 08/11/2016 09:59 EDT | | event date = 08/11/2016 09:59 EDT | ||
| last update date = 08/11/2016 | | last update date = 08/11/2016 | ||
| title = Manual Reactor Trip Due | | title = Manual Reactor Trip Due to Loss of Two Circulating Water Pumps | ||
| event text = Reactor operators manually tripped the reactor due to the loss of two out of four circulating water pumps which caused a drop in condenser vacuum. The trip was uncomplicated. The reactor is shutdown and stable with decay heat removal via steam dumps to the condenser. The cause of the circulating water pump trips is currently unknown, but initial indications are that the pumps tripped due to a lightning strike that caused an electrical perturbation. The reactor will remain shutdown while the licensee investigates the cause. Unit 3 was not affected. | | event text = Reactor operators manually tripped the reactor due to the loss of two out of four circulating water pumps which caused a drop in condenser vacuum. The trip was uncomplicated. The reactor is shutdown and stable with decay heat removal via steam dumps to the condenser. The cause of the circulating water pump trips is currently unknown, but initial indications are that the pumps tripped due to a lightning strike that caused an electrical perturbation. The reactor will remain shutdown while the licensee investigates the cause. Unit 3 was not affected. | ||
The licensee notified the NRC Resident Inspector and the State and Local governments. | The licensee notified the NRC Resident Inspector and the State and Local governments. |
Latest revision as of 21:44, 1 March 2018
Where | |
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Millstone ![]() Connecticut (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
Time - Person (Reporting Time:+-2.83 h-0.118 days <br />-0.0168 weeks <br />-0.00388 months <br />) | |
Opened: | Barrett Nichols 11:09 Aug 11, 2016 |
NRC Officer: | Daniel Mills |
Last Updated: | Aug 11, 2016 |
52169 - NRC Website
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