Event Notification Report for March 08, 2014
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/07/2014 - 03/08/2014
EVENT NUMBERS
49884
Power Reactor
Event Number: 49884
Facility: SUSQUEHANNA
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: DOUGLAS LAMARCA
HQ OPS Officer: JEFF ROTTON
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: DOUGLAS LAMARCA
HQ OPS Officer: JEFF ROTTON
Notification Date: 03/08/2014
Notification Time: 10:25 [ET]
Event Date: 03/08/2014
Event Time: 03:25 [EST]
Last Update Date: 03/08/2014
Notification Time: 10:25 [ET]
Event Date: 03/08/2014
Event Time: 03:25 [EST]
Last Update Date: 03/08/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL
10 CFR Section:
50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL
Person (Organization):
FRED BOWER (R1DO)
FRED BOWER (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 93 | Power Operation | 93 | Power Operation |
| 2 | N | N | 0 | Cold Shutdown | 0 | Cold Shutdown |
UNIT 2 LOSS OF SECONDARY CONTAINMENT DUE TO DISCHARGE DAMPER FAILURE
"On March 8, 2014 at 0325 [EST], Secondary Containment Zone 2 (Unit 2 Reactor Building) differential pressure went to 0.0 inches WG [water gauge] following a routine transfer of Unit 2 Reactor Protection System (RPS) Power supplies. Upon restoration from the RPS power supply transfer, one of the Reactor Building Exhaust Fans tripped due to a malfunction of its discharge damper. Zone 2 HVAC was restored at 0335 by placing the other train of fans in service. Zone I (Unit 1 Reactor Building) and III (Common Refuel Floor Area) ventilation remained in service and stable.
"Zone 2 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 inches WG within a few minutes and was verified to be stable. LCO 3.6.4.1 was entered at 0325 and exited at 0354. Tech Spec for Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge for all three Reactor Building Ventilation Zones.
"There have been no further perturbations in differential pressure and secondary containment remains operable.
"This event is being reported under 10 CFR 50.72(b)(3)(v)(C) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a safety function. There is no redundant Susquehanna Secondary Containment System."
The licensee notified the NRC Resident Inspector.
"On March 8, 2014 at 0325 [EST], Secondary Containment Zone 2 (Unit 2 Reactor Building) differential pressure went to 0.0 inches WG [water gauge] following a routine transfer of Unit 2 Reactor Protection System (RPS) Power supplies. Upon restoration from the RPS power supply transfer, one of the Reactor Building Exhaust Fans tripped due to a malfunction of its discharge damper. Zone 2 HVAC was restored at 0335 by placing the other train of fans in service. Zone I (Unit 1 Reactor Building) and III (Common Refuel Floor Area) ventilation remained in service and stable.
"Zone 2 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 inches WG within a few minutes and was verified to be stable. LCO 3.6.4.1 was entered at 0325 and exited at 0354. Tech Spec for Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge for all three Reactor Building Ventilation Zones.
"There have been no further perturbations in differential pressure and secondary containment remains operable.
"This event is being reported under 10 CFR 50.72(b)(3)(v)(C) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a safety function. There is no redundant Susquehanna Secondary Containment System."
The licensee notified the NRC Resident Inspector.