Event Notification Report for May 29, 2008
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/28/2008 - 05/29/2008
EVENT NUMBERS
44247
Power Reactor
Event Number: 44247
Facility: SAN ONOFRE
Region: 4 State: CA
Unit: [] [2] [3]
RX Type: [1] W-3-LP,[2] CE,[3] CE
NRC Notified By: CLAY WILLIAMS
HQ OPS Officer: MARK ABRAMOVITZ
Region: 4 State: CA
Unit: [] [2] [3]
RX Type: [1] W-3-LP,[2] CE,[3] CE
NRC Notified By: CLAY WILLIAMS
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 05/29/2008
Notification Time: 18:06 [ET]
Event Date: 05/29/2008
Event Time: 11:36 [PDT]
Last Update Date: 05/29/2008
Notification Time: 18:06 [ET]
Event Date: 05/29/2008
Event Time: 11:36 [PDT]
Last Update Date: 05/29/2008
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
WILLIAM JONES (R4)
WILLIAM JONES (R4)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 99 | Power Operation | 99 | Power Operation |
| 3 | N | Y | 80 | Power Operation | 80 | Power Operation |
OFFSITE POWER BELOW 59.7 HZ
"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."
"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."