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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARPNO-IV-12-006, B Update Region IV Response to Hurricane/Severe Weather on Golf Coast2012-09-0505 September 2012
PNO-IV-12-006B Update Region IV Response to Hurricane/Severe Weather on Golf Coast
ML12243A5062012-08-30030 August 2012
PNO-IV-12-006-A Update: Region IV Response to Hurricane/Severe Weather on Golf Coast
ML12242A4262012-08-29029 August 2012
PNO-IV-12-006 Region IV Response to Hurricane/Severe Weather on Gulf Coast
PNO-IV-12-004, B Update Augmented Inspection Team Onsite at River Bend Station2012-06-12012 June 2012
PNO-IV-12-004B Update Augmented Inspection Team Onsite at River Bend Station
ML12157A2862012-06-0505 June 2012
PNO-IV-12-004A-Update River Bend Station Augmented Inspection Team Onsite
ML12150A3472012-05-29029 May 2012
PNO-IV-12-004 Augmented Inspection Team Onsite at River Bend Station
ML0825403952008-09-10010 September 2008
PNO-IV-2008-008A - Entergy Operations, Inc. (Waterford-3 and River Bend Station), NRC Response to Hurricane Gustav Update, 09/10/2008
ML0824606222008-09-0202 September 2008
PNO-IV-2008-008, Entergy Operations, Inc., Waterford-3 and River Bend Station, NRC Response to Hurricane Gustav
PNO-IV-07-005, A: Entergy Operations, Inc. (River Bend Station), Update to Reactor Shutdown Due to Unexpected Change in Recirculation Flow2007-06-0404 June 2007
PNO-IV-07-005A: Entergy Operations, Inc. (River Bend Station), Update to Reactor Shutdown Due to Unexpected Change in Recirculation Flow
ML0714304492007-05-23023 May 2007
PNO-IV-07-005: Entergy Operations, Inc.(River Bend Station) Reactor Shutdown Due to Unexpected Change in Recirculation Flow
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-04-027, River Bend Station - Shutdown Greater than 72 Hours2004-10-0404 October 2004
PNO-IV-04-027: River Bend Station - Shutdown Greater than 72 Hours
PNO-IV-04-025, A: Entergy Operations, Inc.: River Bend Station and Waterford-3 - Update to Region IV Response to Hurricane Ivan2004-09-16016 September 2004
PNO-IV-04-025A: Entergy Operations, Inc.: River Bend Station and Waterford-3 - Update to Region IV Response to Hurricane Ivan
PNO-IV-02-052, A: Update of Response to Hurricane/ Severe Weather on Gulf Coast2002-10-0404 October 2002
PNO-IV-02-052A: Update of Response to Hurricane/ Severe Weather on Gulf Coast
PNO-IV-02-051, A Entergy Operations, Inc., Update of Response to Hurricane/Severe Weather on Gulf Coast2002-09-26026 September 2002
PNO-IV-02-051A Entergy Operations, Inc., Update of Response to Hurricane/Severe Weather on Gulf Coast
2012-09-05
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May 23, 2007PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-IV-07-005 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interestsignificance. The information is as initially received without verification or evaluation, and is basicallyall that is known by the Region IV, Arlington, Texas, staff on this date. FacilityRiver Bend StationEntergy Operations, Inc.
St. Francisville, Louisiana Docket No: 50-458 License No: NPF-47Licensee Emergency Classification Notification of Unusual Event Alert Site Area Emergency General Emergency X Not Applicable
SUBJECT:
REACTOR SHUTDOWN DUE TO UNEXPECTED CHANGE IN RECIRCULATION FLOWDESCRIPTION:
On May 22, 2007, at 10:36 p.m. (CDT), the River Bend Station was shutdown due to an unexpectedchange in recirculation flow in the A reactor recirculation loop. The reactor was shutdown to facilitate licensee investigation for the cause of the flow change. The recirculation system provides forced circulation of water through the reactor.On May 21, 2007, at 11:59 p.m. reactor recirculation loop 'A' flow unexpectedly lowered, without anychange in the reactor recirculation flow control valve 'A' position. The licensee balanced flows between the two reactor recirculation loops to meet Technical Specification requirements and maintained power operation at 90 percent throughout the day while evaluating the unexpected change in flow. The cause for the flow change was not identified and the licensee decided to shutdown the reactor to support further inspections of the recirculation system.The plant is currently being cooled to cold shutdown conditions and the licensee has formed severalteams to further investigate the unexpected change in recirculation flow.The onsite NRC resident inspectors are monitoring licensee investigation activities. This information has been discussed with the licensee and is current as of 1:00 p.m. on May 23, 2007.ADAMS ACCESSION NUMBER: ML071430449CONTACT: Wayne WalkerDRP/SPE/C 817-320-3675 wcw@nrc.gov
