ENS 40664
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ENS Event | |
|---|---|
18:50 Apr 10, 2004 | |
| Title | Manual Reactor Trip Due to Loss of Both Main Feedwater Pumps |
| Event Description | San Onofre Unit 2 was manually tripped from 97% power due to the loss of feed water pumps. After both feedwater pumps tripped, the operators manually tripped the reactor. Both trains of the emergency feed water system actuated as expected due to the initial power level. The plant is stable at NOP/NOT. The cause of the feed water pump trips is being evaluated. All control rods fully inserted and all safety systems worked properly. The steam generators are discharging steam to the main condenser using the turbine bypass valves. AFW pumps are running to maintain steam generator water levels.
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 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.93 h-0.0804 days <br />-0.0115 weeks <br />-0.00264 months <br />) | |
| Opened: | Joel Barnett 16:54 Apr 10, 2004 |
| NRC Officer: | Bill Gott |
| Last Updated: | Apr 10, 2004 |
| 40664 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (97 %) |
| 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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