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Category:NRC Preliminary Notification of Event/Occurrence
MONTHYEARPNO-IV-13-003, SONGS Decommissioning2013-06-0707 June 2013
PNO-IV-13-003 SONGS Decommissioning
PNO-IV-12-003, A - Update Augmented Inspection Team Onsite at San Onofre, Unit 32012-03-16016 March 2012
PNO-IV-12-003A - Update Augmented Inspection Team Onsite at San Onofre, Unit 3
ML12032A2432012-02-0101 February 2012
PNO-IV-12-003: San Onofre Unit 3 Steam Generator Tube Leak and Rapid Shutdown
ML1130606732011-11-0202 November 2011
PNO-IV SCE SONGS 3 Ammonia Leak Causes Evacuation of Unit 3 Turbine Building and Alert Declaration
PNO-IV-09-003, Southern California Edison, San Onofre Nuclear Generating Station, Subject: Contract Fire Watch Employee Terminated for Use of a Prohibited Substance in the Site Protected Area2009-03-12012 March 2009
PNO-IV-09-003, Southern California Edison, San Onofre Nuclear Generating Station, Subject: Contract Fire Watch Employee Terminated for Use of a Prohibited Substance in the Site Protected Area
PNO-IV-08-006, Southern California Edison Company (San Onofre Nuclear Generating Station), Seismic Event Near San Onfore Nuclear Generating Station and University of California (Irvine) Research Reactor, 07/29/20082008-07-29029 July 2008
PNO-IV-08-006: Southern California Edison Company (San Onofre Nuclear Generating Station), Seismic Event Near San Onfore Nuclear Generating Station and University of California (Irvine) Research Reactor, 07/29/2008
PNO-IV-07-008, D - Southern California Edison Co., Final Update - Southern California Brush Fires and San Onofre Nuclear Generating Station, 10/26/20072007-10-26026 October 2007
PNO-IV-07-008D - Southern California Edison Co., Final Update - Southern California Brush Fires and San Onofre Nuclear Generating Station, 10/26/2007
ML0729809102007-10-25025 October 2007
PNO-IV-07-008C: Update - Southern California Brush Fires and San Onofre Nuclear Generation Station (SONGS) Status, 10/25/2007
ML0729801882007-10-25025 October 2007
PNO-IV-07-008B: Update - Southern California Brush Fires and San Onofre Nuclear Generating Station Status
ML0729704662007-10-24024 October 2007
PNO-IV-07-008A, Update - Southern California Brush Fires and San Onofre Nuclear Generating Station Status
ML0729606372007-10-23023 October 2007
PNO-IV-07-008 Southern California Edison Company (San Onofre Units 2 & 3, Southern California Brush Fires and San Onofre Nuclear Generating Station Status, 10/23/2007
PNO-IV-07-006, A, San Onofre Nuclear Generating Station, Update to Unit 2 Reactor Shut Down (Event Notification EN 43435)2007-06-27027 June 2007
PNO-IV-07-006A, San Onofre Nuclear Generating Station, Update to Unit 2 Reactor Shut Down (Event Notification EN 43435)
ML0717304982007-06-22022 June 2007
PNO-IV-07-006 - Southern California Edison (San Onofre Nuclear Generating Station, Unit 2, Unit 2 Reactor Shutdown (Event Notification EN 43435), 06/22/2007
PNO-IV-06-010, Southern California Edison Subject: Tritium Detected in Water Samples Taken on the Site2006-08-15015 August 2006
PNO-IV-06-010: Southern California Edison Subject: Tritium Detected in Water Samples Taken on the Site
PNO-IV-06-004, San Onofre, Unit 3, Shutdown of San Onofre Unit 3 to Investigate Safety Injection Tank Gaskets2006-03-29029 March 2006
PNO-IV-06-004 - San Onofre, Unit 3, Shutdown of San Onofre Unit 3 to Investigate Safety Injection Tank Gaskets
PNO-IV-05-004, SONGS - Shutdown to Repair Component Cooling Water Valve2005-02-18018 February 2005
PNO-IV-05-004: SONGS - Shutdown to Repair Component Cooling Water Valve
PNO-IV-04-003, Southern California Edison, Unit 3 Shutdown to Repair a Letdown System Piping Leak2004-01-27027 January 2004
PNO-IV-04-003: Southern California Edison, Unit 3 Shutdown to Repair a Letdown System Piping Leak
PNO-IV-02-047, Earthquake of Magnitude of 4.6 Approximately 40.0 Miles Northeast from San Onofre Nuclear Plant2002-09-0303 September 2002
PNO-IV-02-047: Earthquake of Magnitude of 4.6 Approximately 40.0 Miles Northeast from San Onofre Nuclear Plant
PNO-IV-02-002, Arrest Associated with Alleged Threats Against Employees at San Onofre Nuclear Generating Station2002-01-10010 January 2002
PNO-IV-02-002: Arrest Associated with Alleged Threats Against Employees at San Onofre Nuclear Generating Station
2013-06-07
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March 29, 2006 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-IV-06-004 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region IV, Arlington, Texas, staff on this date.
Facility Licensee Emergency Classification San Onofre, Unit 3 Notification of Unusual Event Southern California Edison Co. Alert San Clemente, CA Site Area Emergency Docket No: 50-362 General Emergency License No: NPF-15 X Not Applicable
SUBJECT:
SHUTDOWN OF SAN ONOFRE UNIT 3 TO INVESTIGATE SAFETY INJECTION TANK GASKETS DESCRIPTION: On March 29, 2006, San Onofre Unit 3 entered a Technical Specification 3.0.3 shutdown action statement at 2:01 a.m. (CST) when the licensee declared both trains of emergency core cooling systems inoperable due to potentially degraded gasket material on all four safety injection tank manway covers which could impact safety injection system operation. Plant operators began the Unit 3 shutdown at 2:50 a.m. (CST) with the unit required to be in Mode 3 by 9:01 a.m. (CST).
Unit 3 was at 100 percent power and Unit 2 was in a refueling outage preparing for startup. On March 27, the licensee discovered gasket material used to seal one of the Unit 2 safety injection tank manway covers in one of the safety injection tank outlet check valves. This gasket material prevented the check valve from fully seating. During inspections of the remaining three Unit 2 safety injection tank manway covers, the licensee found the gaskets degraded but intact; therefore, the licensee determined the same condition could exist on the Unit 3 safety injection tanks.
The state of California will be informed.
The information presented herein has been discussed with the licensee and is current as of 1100 a.m. (CST) on March 29, 2006.
This preliminary notification is issued for information only and the resident inspector staff will follow the resolution of the degraded safety injection tank gaskets.
ADAMS ACCESSION NUMBER: ML060880230 CONTACTS: Troy Pruett, Chief Projects Branch D Division of Reactor Projects 817-860-8173 twp@nrc.gov
