ENS 44247
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ENS Event | |
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18:36 May 29, 2008 | |
Title | Offsite Power Below 59.7 Hz |
Event Description | On May 29, 2008, at approximately 1136 PDT, the offsite power grid connected to San Onofre experienced a momentary system disturbance. Control Room indicators alerted Operators that the grid frequency dipped to approximately 59.6 Hz. Because frequency dipped below 59.7 Hz, SCE is reporting this event in accordance with 10CFR50.72(b)(3)(v)(D).
The frequency dip lasted approximately 10 seconds, reportedly due to a loss of generation in the Pacific Northwest. The grid is currently operating at nominal frequency. At the time of the event, San Onofre Unit 2 was operating in Mode 1 at approximately 99 percent power and Unit 3 was operating in Mode 1 at approximately 80 percent power. The NRC Resident Inspector has been notified of this event and will be provided a copy of this report. |
Where | |
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San Onofre California (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+-0.5 h-0.0208 days <br />-0.00298 weeks <br />-6.849e-4 months <br />) | |
Opened: | Clay Williams 18:06 May 29, 2008 |
NRC Officer: | Mark Abramovitz |
Last Updated: | May 29, 2008 |
44247 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (99 %) |
After | Power Operation (99 %) |
Unit 3 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (80 %) |
After | Power Operation (80 %) |
San Onofre with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 456282010-01-13T19:25:00013 January 2010 19:25:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Wrong Train of Emergency Core Cooling System Removed from Service ENS 442472008-05-29T18:36:00029 May 2008 18:36:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Offsite Power Below 59.7 Hz ENS 442272008-05-20T20:10:00020 May 2008 20:10:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Offsite Power Grid Disturbance ENS 423102006-02-04T02:15:0004 February 2006 02:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Offsite Power Not within Specifications ENS 417982005-06-26T11:17:00026 June 2005 11:17:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Edg Inoperable Due to Loose Electrical Connection ENS 408182004-06-14T14:41:00014 June 2004 14:41:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Licensee Declared Offsite Power Inoperable Due to Dip in Grid Frequency 2010-01-13T19:25:00 | |
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