ENS 45498
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ENS Event | |
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13:26 Nov 15, 2009 | |
Title | Unit 2 Declared an Unusual Event Due to a Loss of Annunciators |
Event Description | At 0826 EST, Millstone Unit 2 declared a NOUE, due to a loss of power to the control room main board annunciators. Power was lost to the non-vital power supply, VR-11&21, during heater drain pump post maintenance testing, which caused the loss of power to the main control board annunciators. Charging and letdown systems are secured. Additional watchstanders were stationed during the annunciator outage. Power was restored to the main control board, and the licensee is in the process of terminating the NOUE. The NRC remained in Normal Mode.
The NRC Senior Resident Inspector has been notified. The State of Connecticut has been notified.
Millstone Unit 2 terminated the NOUE at 0859 EST after power was restored to the main control board annunciator. Notified R1DO (Cahill), R1RA (Roberts), IRD MOC (Grant), NRR ET (Boger), NRR EO (Bahadur). The NRC Senior Resident Inspector has been notified. The State of Connecticut has been notified as well as DHS and FEMA. |
Where | |
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Millstone Connecticut (NRC Region 1) | |
Reporting | |
10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
Time - Person (Reporting Time:+-4.48 h-0.187 days <br />-0.0267 weeks <br />-0.00614 months <br />) | |
Opened: | Brien Strizzi 08:57 Nov 15, 2009 |
NRC Officer: | Dong Park |
Last Updated: | Nov 15, 2009 |
45498 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Not Critical |
Scram | No |
Before | Hot Standby (0 %) |
After | Hot Standby (0 %) |
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