ML093200625

NRC Operations Center Event Report - Oyster Creek

ML093200625
Person / Time
Site:	Oyster Creek
Issue date:	07/24/2009
From:	Tritt H Exelon Generation Co
To:	Office of Nuclear Reactor Regulation, NRC Region 1
References
FOIA/PA-2009-0214
Download: ML093200625 (2)

Text

0712412009 U.S. Nuclear Regulatory Commission Operations Center Event Report Paze I Power Reactor Event# 45196 Site: OYSTER CREEK Notification Date / Time: 07/12/2009 02:11 (EDT)Unit: 1 Region: 1 State: NJ Event Date /Time: 07/12/2009 01:48 (EDT)Reactor Type: [1] GE-2 Last Modification:

07/13/2009 Containment Type: MARK I NRC Notified by: HERB TRITT Notifications:

GLENN DENTEL R1DO HQ Ops Officer: STEVE SANDIN BRIAN HOLIAN NRR EO Emergency Class: UNUSUAL EVENT BILL GOTT IRD 10 CFR Section: SAM COLLINS R1 RA 50.72(a) (1) (i) EMERGENCY DECLARED JIM WIGGINS NRR ET 50.72(b)(2)(iv)(B)

RPS ACTUATION

-CRITICAL AL AUSTIN FEMA 50.72(b)(3)(v)(A)

POT UNABLE TO SAFE SD MIKE INZER DHS 50.72(b)(3)(iv)(A)

VALID SPECIF SYS ACTUATION Unit Scram Code RX Crit Init Power Initial RX Mode Curr Power Current RX Mode 1 A/R Yes 100 Power Operation 0 Hot Shutdown UNUSUAL EVENT DECLARED DUE TO A LOSS OF OFFSITE POWER At 0135 EDT on 07/12 both Startup Transformers "SA" and "SB" were deenergized due to the loss of the 34.5kV power distribution lines (offsite power). The licensee declared an Unusual Event at 0148 EDT based on the loss of power to both transformers for greater than 15 minutes (EAL MU1).As a result of the loss of offsite power, the Unit automatically scrammed with all control rods fully inserting.

Both Emergency Diesel Generators EDG #1 and EDG #2 auto started and are carrying vital loads. The Unit is stable in Hot Shutdown with decay heat removal via the Isolation Condenser.

The licensee reported that the transient may be due to a possible lightning strike caused by adverse weather.The licensee informed the NJ State Police and the NRC Resident Inspector.

• • • UPDATE AT 0413 EDT ON 07/12/09 FROM WILL TOLBERT TO DONALD NORWOOD * * *At 0405 EDT on 07/12 the licensee terminated the Unusual Event based on restoration of offsite power and reenergizing both Startup Transformers.

The licensee informed the NJ State Police and the NRC Resident Inspector.

Notified R1 (Lew), EO (Holian), IRD (Gott), FEMA (Austin) and DHS (Inzer).* *

• UPDATE AT 0413 EDT ON 07/13/09 FROM CALVIN TAYLOR TO DONALD NORWOOD * *

• 07/24/2009 U.S. Nuclear Regulatory Commission Operations Center Event Report Pa-ee 2 Power Reactor Event# 45196 Licensee changed one reporting requirement from 50.72(b)(3)(v)(B) to 50.72(b)(3)(iv)(A).

Notified R1 DO (Dentel).