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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARPNO-IV-13-001, A Update South Texas Project Unit 2 Reactor Trip2013-04-23023 April 2013
PNO-IV-13-001A Update South Texas Project Unit 2 Reactor Trip
PNO-IV-11-009, B: Update to South Texas Project Unit 2 Reactor Trip and Extended Outage2012-04-24024 April 2012
PNO-IV-11-009B: Update to South Texas Project Unit 2 Reactor Trip and Extended Outage
ML12012A3492012-01-12012 January 2012
PNO-IV-11-009A - STP - Supplement for Shutdown on Nov 29 2011 Due to a Main Generator Fault
PNO-IV-10-005, A: Update - South Texas Project Unit 2 Reactor Trip and Notification of Unusual Event2010-11-12012 November 2010
PNO-IV-10-005A: Update - South Texas Project Unit 2 Reactor Trip and Notification of Unusual Event
PNO-IV-06-002, South Texas Project Nuclear Operating Company, South Texas Project Unit 1 Subject: Fire Affecting Non Safety-Related Equipment Located in a Safety-Related Room2006-03-23023 March 2006
PNO-IV-06-002 - South Texas Project Nuclear Operating Company, South Texas Project Unit 1 Subject: Fire Affecting Non Safety-Related Equipment Located in a Safety-Related Room
PNO-IV-05-013, A, Waterford-3, River Bend Station and South Texas Project, NRC Exits Monitoring Mode for Hurricane Rita2005-09-26026 September 2005
PNO-IV-05-013A, Waterford-3, River Bend Station and South Texas Project, NRC Exits Monitoring Mode for Hurricane Rita
PNO-IV-05-003, South Texas Project Operating Company, Shutdown to Repair Reactor Coolant System Leak2005-02-10010 February 2005
PNO-IV-05-003: South Texas Project Operating Company, Shutdown to Repair Reactor Coolant System Leak
PNO-IV-03-022, A: South Texas Project Electric Generating Station - Reactor Vessel Bottom Head Penetration Leakage - Update2003-08-11011 August 2003
PNO-IV-03-022A: South Texas Project Electric Generating Station - Reactor Vessel Bottom Head Penetration Leakage - Update
PNO-IV-03-035, A: South Texas Project Electric Generating - Update on Effects of Hurricane Claudette2003-07-16016 July 2003
PNO-IV-03-035A: South Texas Project Electric Generating - Update on Effects of Hurricane Claudette
ML0310806002003-04-14014 April 2003
Event 39754: South Texas, Reactor Vessel Bottom Head Degraded Condition
PNO-IV-03-006, STP Nuclear Operating Company, South Texas 2, Maintenance Outage Greater than 72 Hours2003-01-28028 January 2003
PNO-IV-03-006 - STP Nuclear Operating Company, South Texas 2, Maintenance Outage Greater than 72 Hours
PNO-IV-02-078, STP Nuclear Operating Co., Shutdown as Result of High Main Turbine Vibration2002-12-18018 December 2002
PNO-IV-02-078: STP Nuclear Operating Co., Shutdown as Result of High Main Turbine Vibration
2013-04-23
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January 12, 2012 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-IV-11-009A
This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. Some information is as initially received without verification or evaluation by the Region IV, Arlington, Texas staff.
Facility South Texas Project Nuclear Operating Company South Texas Project Unit 2 P.O. Box 289 Wadsworth, TX 77483 Docket: 50-499 License No. NPF-80 Licensee Emergency Classification Notification of Unusual Event Alert Site Area Emergency General Emergency X Not Applicable
SUBJECT:
Update to South Texas Project Unit 2 Reactor Trip
DESCRIPTION: This preliminary notification supplements information in PNO-IV-11-009, which documented the shutdown of South Texas Project Unit 2 on November 29, 2011, due to a main generator fault. Automatic protective features for the main generator caused it to go offline, resulting in a turbine trip and a reactor trip per design. Inspections of the main generator identified that a ground fault had occurred in the main generator stator.
During inspections following the event, plant personnel identified damage to the main generator and other components resulting from the ground fault. The licensee will restore the plant to operation once repairs to the main generator have been completed. The cause of the ground fault has not yet been determined.
The reactor is stable in Mode 5 (Cold Shutdown) while the main generator is being repaired. The NRC continues to monitor licensee corrective actions and root cause determinations of the trip, and will evaluate them prior to plant restart.
Unit 1 was unaffected by the event and continues to operate at 100 percent power.
The information presented herein has been discussed with the licensee and is current as of 3:00 p.m. (CST), on January 12, 2012.
ADAMS ACCESSION NUMBER: ML12012A349 CONTACTS: David Proulx Lara Uselding (817) 320-5686 (817) 917-0321 David.Proulx@nrc.gov Lara.Uselding@nrc.gov
