ML13080A240
| ML13080A240 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/21/2013 |
| From: | Guthrie E F, Kontz C R Division Reactor Projects II |
| To: | |
| References | |
| PNO-II-13-004 | |
| Download: ML13080A240 (1) | |
Text
March 21, 2013 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-II-13-004 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. Some of the information may not yet be fully verified or evaluated by the Region II staff. (Atlanta, Ga)
Facility Licensee Emergency Classification Browns Ferry, Unit 1 ___ Notification of Unusual Event Tennessee Valley Authority (TVA) ___ Alert Athens, Al ___ Site Area Emergency Docket: 50-259 ___ General Emergency
_X_ Not Applicable
SUBJECT:
UNPLANNED SHUTDOWN GREATER THAN 72 HOURS DUE TO REACTOR FEEDWATER HEATER LEVEL CONTROL LINE LEAK
At 4:02 a.m. [CDT] on March 19, 2013, the Browns Ferry Unit 1 reactor was manually scrammed due to lowering main condenser vacuum. The cause of the loss of vacuum was a significant leak on the 1C feedwater heater level control line near the penetration to the main condenser. Condenser vacuum was approaching the turbine trip setpoint, at which time the reactor was manually scrammed. Condenser vacuum recovered following the scram. Reactor pressure was controlled by the main turbine bypass valves and reactor level was controlled by reactor feedwater pumps. In response to the scram, all plant equipment responded as
designed. The NRC resident inspectors continue to monitor the licensee's actions for plant recovery and startup. This preliminary notification is being made because the Unit 1 outage will take more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> while the licensee makes repairs and prepares to restart the plant.
This preliminary notification is issued for information only and no further action by the staff is anticipated. Region II received the information from the licensee via notification of the Resident Inspector and Event Notification (48829). The state of Alabama has been notified via telephone. The information presented herein has been discussed with the licensee, and is current as of 8:45 a.m. on March 21, 2013.
Contact: Craig Kontz Eugene Guthrie (404) 997-4515 (404)997-4662
Craig.Kontz@nrc.gov Eugene.Guthrie@nrc.gov