Event Notification Report for April 17, 2014
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/16/2014 - 04/17/2014
EVENT NUMBERS
50040
Power Reactor
Event Number: 50040
Facility: SUSQUEHANNA
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: RONALD FRY
HQ OPS Officer: STEVE SANDIN
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: RONALD FRY
HQ OPS Officer: STEVE SANDIN
Notification Date: 04/17/2014
Notification Time: 06:00 [ET]
Event Date: 04/17/2014
Event Time: 03:35 [EDT]
Last Update Date: 04/17/2014
Notification Time: 06:00 [ET]
Event Date: 04/17/2014
Event Time: 03:35 [EDT]
Last Update Date: 04/17/2014
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):
ART BURRITT (R1DO)
ART BURRITT (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF SECONDARY CONTAINMENT DURING PREPARATION FOR LOCA/LOOP TESTING
"On April 17, 2014 at 0335 EDT, Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure went to 0.15 inches WG [negative] following securing Unit 1 Zone 3 HVAC in preparation for a LOCA/LOOP test. Zone 3 HVAC was restored at 0420 EDT. Zone I (Unit 1 Reactor Building) ventilation is isolated with secondary containment relaxed for refuel outage on Unit 1. Zone II (Unit 2 Reactor Building) ventilation remained in service and stable.
"Zone 3 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 inches WG [negative] at 0420 EDT and was verified to be stable. LCO 3.6.4.1 was entered at 0335 EDT and exited at 0420 EDT. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge [WG] for all three Reactor Building Ventilation Zones.
"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 informed the NRC Resident Inspector.
"On April 17, 2014 at 0335 EDT, Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure went to 0.15 inches WG [negative] following securing Unit 1 Zone 3 HVAC in preparation for a LOCA/LOOP test. Zone 3 HVAC was restored at 0420 EDT. Zone I (Unit 1 Reactor Building) ventilation is isolated with secondary containment relaxed for refuel outage on Unit 1. Zone II (Unit 2 Reactor Building) ventilation remained in service and stable.
"Zone 3 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 inches WG [negative] at 0420 EDT and was verified to be stable. LCO 3.6.4.1 was entered at 0335 EDT and exited at 0420 EDT. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge [WG] for all three Reactor Building Ventilation Zones.
"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 informed the NRC Resident Inspector.