Event Notification Report for October 06, 2013
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/05/2013 - 10/06/2013
EVENT NUMBERS
49414
Power Reactor
Event Number: 49414
Facility: OYSTER CREEK
Region: 1 State: NJ
Unit: [1] [] []
RX Type: [1] GE-2
NRC Notified By: CHARLES SPAGNUOLO
HQ OPS Officer: BILL HUFFMAN
Region: 1 State: NJ
Unit: [1] [] []
RX Type: [1] GE-2
NRC Notified By: CHARLES SPAGNUOLO
HQ OPS Officer: BILL HUFFMAN
Notification Date: 10/06/2013
Notification Time: 14:26 [ET]
Event Date: 10/06/2013
Event Time: 11:30 [EDT]
Last Update Date: 10/06/2013
Notification Time: 14:26 [ET]
Event Date: 10/06/2013
Event Time: 11:30 [EDT]
Last Update Date: 10/06/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
JUDY JOUSTRA (R1DO)
JUDY JOUSTRA (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | M/R | Y | 20 | Power Operation | 0 | Hot Shutdown |
MANUAL REACTOR SCRAM DUE TO DEGRADED CONDENSER VACUUM
"Today at approximately 1040 [EDT], during a planned reactor power ascension with reactor power at approximately 20% of rated thermal power, main condenser vacuum began to lower. In accordance with the abnormal operating procedure for degrading vacuum, Operators inserted a manual scram of the reactor at 1130 [EDT]. The cause of the degraded vacuum is currently under investigation.
"All rods inserted into the core and all systems functioned as expected during the scram. No electromatic (EMRVs) or safety relief valves lifted during the transient. The plant is currently shutdown and parameters are stable. The plant is in its normal shutdown electrical lineup and decay heat is being removed via steam bypass valves to the main condenser.
"This event is reportable within 4 hours per 10CFR50.72(b)(2)(iv)(B) - any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation."
The licensee has notified the NRC Resident Inspector and will be notifying state authorities.
"Today at approximately 1040 [EDT], during a planned reactor power ascension with reactor power at approximately 20% of rated thermal power, main condenser vacuum began to lower. In accordance with the abnormal operating procedure for degrading vacuum, Operators inserted a manual scram of the reactor at 1130 [EDT]. The cause of the degraded vacuum is currently under investigation.
"All rods inserted into the core and all systems functioned as expected during the scram. No electromatic (EMRVs) or safety relief valves lifted during the transient. The plant is currently shutdown and parameters are stable. The plant is in its normal shutdown electrical lineup and decay heat is being removed via steam bypass valves to the main condenser.
"This event is reportable within 4 hours per 10CFR50.72(b)(2)(iv)(B) - any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation."
The licensee has notified the NRC Resident Inspector and will be notifying state authorities.