ENS 43928
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ENS Event | |
|---|---|
22:15 Jan 23, 2008 | |
| Title | One of Two Main Feedwater Pumps Trip |
| Event Description | On January 23, 2008, at about 1415 PST, SONGS Unit 2 was operating at approximately 95 percent power when one of two main feed water pumps (P063/K005), tripped on low oil pressure while an adjustment was being made to the pump's lubricating oil pressure regulator. Control room operators manually actuated the emergency feedwater system in accordance with Abnormal Operating Instructions. Control room operators reduced reactor power level to about 65 percent which can be sustained with one normal feedwater pump in operation. The cause of this event is currently under investigation.
In compliance with 10CFR50.72(b)(3)(iv)(A), requiring licensees to report any event or condition that results in valid actuation of the emergency feedwater system, SCE is providing this notification to the NRC. At the time of this occurrence, Unit 3 was operating at about 100 percent power. SCE has notified the NRC resident inspectors about this occurrence and will provide them with a copy of this report. |
| Where | |
|---|---|
San Onofre  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-0.68 h-0.0283 days <br />-0.00405 weeks <br />-9.31464e-4 months <br />) | |
| Opened: | Susan Gardner 21:34 Jan 23, 2008 |
| NRC Officer: | John Knoke |
| Last Updated: | Jan 23, 2008 |
| 43928 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (95 %) |
| After | Power Operation (65 %) |
WEEKMONTHYEARENS 472522011-09-08T22:38:0008 September 2011 22:38:00
[Table view]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 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 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 2011-09-08T22:38:00 | |
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