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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, 2006 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-IV-06-010 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 staff on this date.
Facility Licensee Emergency Classification Southern California Edison Notification of Unusual Event San Onofre Nuclear Generating Station, Unit 1 Alert San Clemente, CA Site Area Emergency Docket: 50-206 General Emergency License: DPR-13 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 the threshold for required reporting specified in 10 CFR Part 20. On August 14, 2006, the licensee made a voluntary communication to California state and local government agencies regarding this 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 ceased commercial operations in 1992 and in recent years has been undergoing dismantlement and decommissioning.
The onsite NRC resident inspectors have reviewed the licensees measurement results and activities. NRC regional radiation specialists will continue to monitor the measurements and licensee assessments during inspections of Unit 1 decommissioning activities.
While the licensee's environmental monitoring continues, the radioactive contamination poses no 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. PDT on 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: ML062270388 CONTACTS: Michael P. Shannon, Chief D. Blair Spitzberg, Chief Plant Support Branch Fuel Cycle & Decommissioning Branch 817-860-8215 817-860-8191 mps1@nrc.gov dbs@nrc.gov
