ENS 44247

v t e ENS Event
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.

ENS 44247 +/-
Where
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 Loading map...
v • d • e

v t e Emergency Notification System
San Onofre with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2010-01-13T19:25:00 [Table view]
[ENS list for San Onofre]

Navigation menu