ENS 45347
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ENS Event | |
|---|---|
19:43 Sep 13, 2009 | |
| Title | |
| Event Description | The SONGS Unit 2 reactor automatically tripped from approximately 94% power at 1243 PDT due to loss of turbine load caused by lowering main condenser vacuum. Prior to the reactor trip, personnel were attempting to conduct a heat treat on Unit 2. During this evolution, Gate 5 in the main circulating water system was being repositioned when it stopped moving at 45 percent. This resulted in a recirculation and subsequent increase in circulating water temperature, a lowering main condenser vacuum, a loss of load on the main turbine, and an associated automatic reactor trip.
All rods inserted on the automatic reactor trip and the electric grid is stable. This event report is being made under 10CFR50.72(b)(2)(iv)(B) as a valid Reactor Protection System actuation. Decay heat is being removed via normal feedwater to steam generators steaming through the condenser bypass valves to the main condenser. At the time of this event, SONGS Unit 3 was operating at approximately 99% power. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
San Onofre  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+-3.52 h-0.147 days <br />-0.021 weeks <br />-0.00482 months <br />) | |
| Opened: | Bill Poirier 16:12 Sep 13, 2009 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Sep 13, 2009 |
| 45347 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (94 %) |
| After | Hot Standby (0 %) |
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 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 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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