ML061180349
| ML061180349 | |
| Person / Time | |
|---|---|
| Site: | Kewaunee  |
| Issue date: | 04/28/2006 |
| From: | Louden P L Division of Nuclear Materials Safety III |
| To: | |
| References | |
| PNO-III-06-012 | |
| Download: ML061180349 (1) | |
Text
April 28, 2006PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-III 0012This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or publicinterest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region III staff on this date. FacilityKewauneeDominion Energy Kewaunee, Inc.
Docket: 50-305 License: DPR-43Licensee Emergency Classification Notification of Unusual Event x Alert Site Area Emergency General Emergency Not Applicable
SUBJECT:
MANUAL REACTOR SHUTDOWN FOLLOWING FEEDWATER PUMP TRIP DESCRIPTION:
On April 26, 2006, the A feedwater pump tripped while plant operators were reducing power inpreparation for a maintenance outage to repair a pipe leak in the service water system. Sincethe B feedwater pump was already shut down, the tripping of the operating pump should havecaused a turbine trip followed by a reactor trip.When the turbine did not trip, operators took manual action to shut down the reactor, whichtripped the turbine. All reactor safety systems functioned as designed during the shutdown. Aloss of condenser vacuum removed the normal method for cooling down the reactor, and operators used the power-operated relief valves to release steam to the atmosphere. The auxiliary feedwater system started and provided flow to the steam generators.The licensee declared an Alert under its emergency plan at 8:49 p.m. CDT because the turbinedid not trip automatically after the feedwater pump shut down. The Alert was terminated at12:24 a.m. on April 27, 2006.The senior resident inspector responded to the site, and the Headquarters Operation Centerand Region III Incident Response Center were staffed to monitor the event.Region III dispatched a Special Inspection Team to review the circumstances surrounding theevent.The licensee and Region III issued news releases, and Region III responded to news mediainquiries. The State of Wisconsin has been informed. The information in this preliminary notification has been reviewed with licensee management.The licensee notified the NRC Operations Center of this event at 9:39 p.m. CDT on April 26,2006. This information is current as of 10:00 a.m. on April 28, 2006.CONTACTS:Patrick Louden630/829-9627