ENS 42310

v t e ENS Event
02:15 Feb 4, 2006
Title	Offsite Power Not within Specifications
Event Description	On February 3, 2006, at about 1646 PST the Devers-Palo Verde line relayed. This required an evaluation of grid nomograms for San Onofre. At about 1815 PST, the Grid Control Center (GCC) notified San Onofre that the grid nomograms predicted offsite power would not be within limits if San Onofre Unit 3 were to trip (San Onofre Unit 2 is currently shutdown in a refueling outage and Unit 3 is operating at about 100 percent power). Plant Operators declared offsite power inoperable at about 1815 PST. At about 1843 PST, the GCC notified San Onofre that the grid operator added generation to the grid and that offsite power was within nomogram limits. Plant Operators declared offsite power operable at that time. Consistent with the guidance provided in NUREG-1022, Rev. 2, Southern California Edison is reporting this event in accordance with 10CFR50.72(b)(3)(v)(D). All four San Onofre diesel generators (two per Unit) remained operable during this event. The San Onofre Senior Resident Inspector has been notified of this event and will be provided with a copy of this report.

ENS 42310 +/-
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:+-1.48 h-0.0617 days <br />-0.00881 weeks <br />-0.00203 months <br />)
Opened:	Clay Williams 00:46 Feb 4, 2006
NRC Officer:	Jeff Rotton
Last Updated:	Feb 4, 2006
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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]

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