ENS 47401
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ENS Event | |
|---|---|
21:50 Nov 1, 2011 | |
| Title | Alert Declared Due to an Ammonia Leak |
| Event Description | On November 1, 2011 at 1450 PDT, San Onofre Unit 3 declared an ALERT and entered EAL HA3.1 due to an ammonia leak that prevented access to local areas. The plant is in a stable condition while the leakage is being secured. The turbine building on Unit 3 has been evacuated. Plant personnel are in the process of verifying no presence of ammonia in the turbine building. There was no impact on Unit 2.
At 1807 PDT licensee exited the ALERT and EAL HA3.1. The leak was at the Ammonia day tank and was flowing through an overflow vent into the berm. The high level in the Ammonia day tank was due to a leaking closed valve between the Demineralizer system and the ammonia bulk storage. The berm area was drained of all fluids. The wind direction caused the ammonia fumes to travel to the Unit 3 turbine deck. No off-site HAZMAT personnel came on-site. At 1756 PDT the precautionary evacuation of on-site personnel was terminated. Unit 2 was not affected from this event. The NRC Resident Inspector was notified. Notified NRR EO (Fredrick Brown), R4DO (Vincent Gaddy, IRDMOC (Jeff Grant), DHS (Hill), DOE (Doyle), USDA (Krauf), FEMA (Fuller) and HHS (Fajardo).
On November 1, 2011, Southern California Edison notified the California Emergency Management Agency at 1755 PDT and the San Diego Department of Environmental Health at 1810 PDT that approximately 25 gallons of Ammonium Hydroxide was spilled under the Ammonium Hydroxide day tank located outside the Unit 3 turbine building. The spill was contained in a berm under the tank and subsequently cleaned up. Both Units 2 and 3 were at approximately 100% power at the time of the event. Notified the R4DO (Gaddy). |
| Where | |
|---|---|
San Onofre  California (NRC Region 4) | |
| Reporting | |
| Emergency class: | Alert |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-3.7 h-0.154 days <br />-0.022 weeks <br />-0.00507 months <br />) | |
| Opened: | Edgar Degivanni 18:08 Nov 1, 2011 |
| NRC Officer: | Vince Klco |
| Last Updated: | Nov 1, 2011 |
| 47401 - NRC Website | |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
San Onofre with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 563762023-02-21T22:02:00021 February 2023 22:02:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Local Agency ENS 546122020-03-26T03:00:00026 March 2020 03:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification for Sewage Release ENS 541792019-07-23T21:05:00023 July 2019 21:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 535802018-09-05T07:00:0005 September 2018 07:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification to a Government Agency for Assistance Relative to a Medical Emergency ENS 522522016-09-19T19:30:00019 September 2016 19:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to San Diego Regional Water Quality Control Board ENS 510182015-04-27T22:27:00027 April 2015 22:27:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Local Agency ENS 504702014-09-18T19:35:00018 September 2014 19:35:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Failure to Submit Required Semi-Annual and Annual Samples and Reports Per Npdes ENS 501152014-05-14T21:54:00014 May 2014 21:54:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Concerning Wildfire Near the Facility ENS 499752014-03-29T04:10:00029 March 2014 04:10:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Discovery of After-The-Fact Emergency Condition -- Unusual Event Due to Seismic Event ENS 489132013-04-11T06:26:00011 April 2013 06:26:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Fbi Notified Due to Degraded Security Radio Communications ENS 484282012-10-21T15:05:00021 October 2012 15:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Hydrogen Leakage ENS 483442012-09-26T00:07:00026 September 2012 00:07:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Freon Leak from Building Air Conditioner ENS 482322012-08-26T19:39:00026 August 2012 19:39:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Earthquake Felt Onsite ENS 478562012-04-20T19:49:00020 April 2012 19:49:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Electrical Panel Fire in Turbine Building ENS 474812011-11-28T14:00:00028 November 2011 14:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of Unplanned Acidic Solution Discharge ENS 474012011-11-01T21:50:0001 November 2011 21:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to an Ammonia Leak ENS 472892011-09-23T00:30:00023 September 2011 00:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to County Agency Due to Inadvertent Wastewater Discharge ENS 470642011-07-16T13:12:00016 July 2011 13:12:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Entry Into Eal Hu4.1 ENS 469042011-05-29T16:57:00029 May 2011 16:57:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an On-Site Sulfuric Acid Spill ENS 467552011-04-14T19:35:00014 April 2011 19:35:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to State of California Due to Hydrogen Leak ENS 466212011-02-17T23:11:00017 February 2011 23:11:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Hydrazine Spill Contained Onsite ENS 466162011-02-15T19:40:00015 February 2011 19:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Off-Site Notification of Sewage Spill Contained On-Site (<100 Gallons) ENS 466122011-02-12T00:15:00012 February 2011 00:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of a Sewage Spill Contained Onsite ENS 465502011-01-18T17:45:00018 January 2011 17:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Siren Growl Heard Offsite ENS 464992010-12-21T04:20:00021 December 2010 04:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Access to Primary Emergency Operations Facility Not Possible Due to Flooding ENS 463952010-11-04T22:04:0004 November 2010 22:04:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Portal Radiation Monitor Alarm on a Scrap Shipment ENS 461332010-07-28T16:45:00028 July 2010 16:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of a Sulfuric Acid Spill ENS 460472010-06-25T21:27:00025 June 2010 21:27:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Hazmat Spill Requiring Offsite Notifications ENS 459432010-05-21T20:20:00021 May 2010 20:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to California Department of Public Health ENS 458602010-04-20T18:03:00020 April 2010 18:03:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Sodium Hydroxide Released Into Berm ENS 458102010-04-04T22:42:0004 April 2010 22:42:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event - Earthquake Felt on Site ENS 456842010-02-08T08:10:0008 February 2010 08:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Emergency Siren Spurious Actuation ENS 456362010-01-19T12:30:00019 January 2010 12:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Emergency Siren Spurious Actuation ENS 455642009-12-12T09:26:00012 December 2009 09:26:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event Declared Due to Both Emergency Diesel Generators Being Inoperable ENS 453282009-09-04T00:30:0004 September 2009 00:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Los Angeles County Public Health Radiation Management Division ENS 452742009-08-19T18:50:00019 August 2009 18:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification for Inadvertant Actuation of Sirens for 10 Seconds ENS 449852009-04-12T11:30:00012 April 2009 11:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Sulfuric Acid Spill Into Burm ENS 449832009-04-10T16:00:00010 April 2009 16:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Sulfuric Acid Overflow ENS 443742008-07-29T21:00:00029 July 2008 21:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Concerning Impact of Earthquake on Southern California Edison Assets ENS 439332008-01-25T17:00:00025 January 2008 17:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Inadvertent Actuation of Emergency Siren ENS 426442006-06-14T05:05:00014 June 2006 05:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Auto Accident Fatality ENS 423702006-02-23T12:00:00023 February 2006 12:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Minor Leakage of Wastewater from Transport Truck ENS 406192004-03-28T21:49:00028 March 2004 21:49:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification at San Ofre 2 and 3 Due to Inadvertent Weapon Discharge 2023-02-21T22:02:00 | |
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