Current Event Notification Report for November 16, 2009
HARRIS - NRC Notified By: LEWIS ROGERS - MANUAL REACTOR TRIP DUE TO MAIN GENERATOR OIL LEAK
"At 2242 [EST] on 11/15/09, the reactor was manually scrammed from
100% power due to a large oil leak on the main generator seal oil
system. Condenser vacuum was broken immediately following the reactor
trip, and the main turbine stopped rotating at 2324 [EST]. Following
the reactor trip, the 'B' steam generator Main Steam Isolation Valve
(MSIV) failed to fully close on demand, but was closed due to field
actions at 2303 [EST]. The reactor remained stable at NOP/NOT following
the reactor trip. Offsite power remained available throughout the
event.
"This condition is being reported as actuation of the reactor protection system in accordance with 10CFR 50.72(b)(2)(iv)(B)."
All control rods fully inserted and decay heat is being removed
through the S/G relief valves to the atmospheric dumps. No known
primary to secondary leakage exists. The plant remains stable in Mode
3.
MILLSTONE - NRC Notified By: BRIEN STRIZZI - UNIT 2 DECLARED AN UNUSUAL EVENT DUE TO A LOSS OF ANNUNCIATORS
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.
* * * NOTIFIED BY BRIEN STRIZZI TO DONG PARK AT 0922 EST ON 11/15/09 * * *
Millstone Unit 2 terminated the NOUE at 0859 EST after power was restored to the main control board annunciator.
