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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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August 15, 2006PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-IV-06-010This 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 IV staff on this date.FacilitySouthern California EdisonSan Onofre Nuclear Generating Station, Unit 1 San Clemente, CADocket: 50-206License: DPR-13Licensee Emergency Classification Notification of Unusual Event Alert Site Area Emergency General Emergency X Not Applicable
SUBJECT:
TRITIUM DETECTED IN WATER SAMPLES TAKEN ON THE SITE DESCRIPTION: On August 7, 2006, the licensee identified low levels of tritium (hydrogen-3)measured in water samples taken at the Unit 1 site which is undergoing decommissioning. The tritium levels ranged from 50,000 to 330,000 picoCuries per liter. These levels are below thethreshold for required reporting specified in 10 CFR Part 20. On August 14, 2006, the licenseemade a voluntary communication to California state and local government agencies regardingthis issue. The groundwater beneath the site is not a source of drinking water. The licensee is investigating possible sources of the tritium. The Unit 1 reactor ceasedcommercial operations in 1992 and in recent years has been undergoing dismantlement anddecommissioning. The onsite NRC resident inspectors have reviewed the licensee's measurement results andactivities. NRC regional radiation speciali sts will continue to monitor the measurements andlicensee assessments during inspections of Unit 1 decommissioning activities. While the licensee's environmental monitoring continues, the radioactive contamination posesno danger to public health and safety. Region IV has informed EDO, NRR, and PA. The licensee voluntarily notified the NRC Operations Center of this situation at 12:08 p.m. PDTon August 14, 2006. The information presented herein has been discussed with the licensee and is current as of 12:00 p.m. on August 15, 2006.ADAMS ACCESSION NUMBER: ML062270388CONTACTS:Michael P. Shannon, ChiefD. Blair Spitzberg, ChiefPlant Support BranchFuel Cycle & Decommissioning Branch817-860-8215817-860-8191 mps1@nrc.govdbs@nrc.gov