ENS 41368
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ENS Event | |
|---|---|
20:27 Feb 3, 2005 | |
| Title | Automatic Reactor Trip Due to Unit Auxiliary Transformer Trip |
| Event Description | On February 3, 2005, at about 1227 PST, SONGS Unit 2 tripped from about 100 percent power. Preliminary information indicates that the Unit 2 Unit Auxiliary Transformer tripped on high differential current, which caused the main generator to trip and caused the Reactor Protection System to automatically trip the reactor, as expected. Auxiliary Feedwater system actuated as designed and the Unit remains stable in Mode 3 on Main Feedwater. SCE's investigation is ongoing.
SCE is reporting this occurrence in accordance with 10CFR50.72(b)(2)(iv)(B) and 10CFR50.72(b)(3)(iv). At the time of this event, SONGS Unit 3 was at about 100 percent power. The NRC resident inspectors are aware of this event and SCE will provide them with a copy of this report. All control rods fully inserted. Decay heat is being rejected to the main condenser. All ESF systems are available and the electrical grid is stable. |
| Where | |
|---|---|
San Onofre  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-2.42 h-0.101 days <br />-0.0144 weeks <br />-0.00331 months <br />) | |
| Opened: | Clay Williams 18:02 Feb 3, 2005 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Feb 3, 2005 |
| 41368 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |
San Onofre with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 476282012-02-01T01:30:0001 February 2012 01:30:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Trip Due to a Primary to Secondary Leak Greater than 30 Gal/Hr ENS 472522011-09-08T22:38:0008 September 2011 22:38:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to a Grid Disturbance ENS 463462010-10-19T22:15:00019 October 2010 22:15:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid Specified System Actuation ENS 453472009-09-13T19:43:00013 September 2009 19:43:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Automatic Reactor Trip Following Turbine Trip for Loss of Condenser Vacuum ENS 442732008-06-06T05:56:0006 June 2008 05:56:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip Due to Low Cooling Flow to Main Generator Rectifier ENS 439282008-01-23T22:15:00023 January 2008 22:15:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation One of Two Main Feedwater Pumps Trip ENS 434352007-06-21T05:50:00021 June 2007 05:50:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Failed Instrument Air Header Leads to Manual Reactor Trip ENS 413682005-02-03T20:27:0003 February 2005 20:27:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Unit Auxiliary Transformer Trip ENS 412092004-11-19T16:07:00019 November 2004 16:07:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Turbine Trip on Main Generator Trip ENS 407912004-06-04T11:45:0004 June 2004 11:45:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation Manual Reactor Trip Due to Intake Structure Seaweed Fouling ENS 406642004-04-10T18:50:00010 April 2004 18:50:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to Loss of Both Main Feedwater Pumps 2012-02-01T01:30:00 | |
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