Event Notification Report for July 24, 2017
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/23/2017 - 07/24/2017
Power Reactor
Event Number: 52870
Facility: OCONEE
Region: 2 State: SC
Unit: [] [] [3]
RX Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP
NRC Notified By: ROBERT SHAW
HQ OPS Officer: DONG HWA PARK
Region: 2 State: SC
Unit: [] [] [3]
RX Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP
NRC Notified By: ROBERT SHAW
HQ OPS Officer: DONG HWA PARK
Notification Date: 07/24/2017
Notification Time: 19:25 [ET]
Event Date: 07/24/2017
Event Time: 16:38 [EDT]
Last Update Date: 07/24/2017
Notification Time: 19:25 [ET]
Event Date: 07/24/2017
Event Time: 16:38 [EDT]
Last Update Date: 07/24/2017
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):
ALAN BLAMEY (R2DO)
ALAN BLAMEY (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
AUTOMATIC REACTOR TRIP DUE TO LOAD REJECTION
"At 1638 [EDT] on 7/24/2017, Oconee Unit 3 experienced an automatic reactor trip due to a load rejection when the generator output breakers both tripped open unexpectedly while 525kV switchyard maintenance was being performed. The trip was uncomplicated with all systems responding normally post-trip. Due to the RPS [Reactor Protection System] actuation while critical, this event is being reported as a 4-hour non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"The plant responded normally to the reactor trip, and there was no impact on the health and safety of the public or plant personnel.
"Operations responded using the Emergency Operating Procedure and stabilized Unit 3 in MODE 3.
"The NRC Senior Resident Inspector has been notified."
Decay heat is removed by discharging steam to the main condenser using the turbine bypass valves. Unit 1 and 2 are not affected.
"At 1638 [EDT] on 7/24/2017, Oconee Unit 3 experienced an automatic reactor trip due to a load rejection when the generator output breakers both tripped open unexpectedly while 525kV switchyard maintenance was being performed. The trip was uncomplicated with all systems responding normally post-trip. Due to the RPS [Reactor Protection System] actuation while critical, this event is being reported as a 4-hour non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"The plant responded normally to the reactor trip, and there was no impact on the health and safety of the public or plant personnel.
"Operations responded using the Emergency Operating Procedure and stabilized Unit 3 in MODE 3.
"The NRC Senior Resident Inspector has been notified."
Decay heat is removed by discharging steam to the main condenser using the turbine bypass valves. Unit 1 and 2 are not affected.
Power Reactor
Event Number: 52871
Facility: LIMERICK
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: MATTHEW BONANNO
HQ OPS Officer: VINCE KLCO
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: MATTHEW BONANNO
HQ OPS Officer: VINCE KLCO
Notification Date: 07/24/2017
Notification Time: 23:50 [ET]
Event Date: 07/24/2017
Event Time: 20:44 [EDT]
Last Update Date: 07/25/2017
Notification Time: 23:50 [ET]
Event Date: 07/24/2017
Event Time: 20:44 [EDT]
Last Update Date: 07/25/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Person (Organization):
DAN SCHROEDER (R1DO)
DAN SCHROEDER (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
OFFSITE NOTIFICATION TO THE PENNSYLVANIA DEPARTMENT OF ENVIRONMENTAL PROTECTION
"At time [2044 EDT], Limerick Generating Station notified the Pennsylvania DEP [Department of Environmental Protection] that there was an imminent overflow of our plant waste water pond (holding pond) due to heavy rainfall in the area. Level in the plant waste water pond was approximately «" from the overflow. Prior to overflowing, plant alignment changes enabled us to lower level in the hold pond to prevent the overflow. PADEP was subsequently notified that an actual overflow condition did not occur."
The licensee notified the NRC Resident Inspector.
"At time [2044 EDT], Limerick Generating Station notified the Pennsylvania DEP [Department of Environmental Protection] that there was an imminent overflow of our plant waste water pond (holding pond) due to heavy rainfall in the area. Level in the plant waste water pond was approximately «" from the overflow. Prior to overflowing, plant alignment changes enabled us to lower level in the hold pond to prevent the overflow. PADEP was subsequently notified that an actual overflow condition did not occur."
The licensee notified the NRC Resident Inspector.