Event Notification Report for February 11, 2018
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/10/2018 - 02/11/2018
EVENT NUMBERS
53202
Power Reactor
Event Number: 53202
Facility: SUSQUEHANNA
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: STEVE KOCH
HQ OPS Officer: VINCE KLCO
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: STEVE KOCH
HQ OPS Officer: VINCE KLCO
Notification Date: 02/11/2018
Notification Time: 23:36 [ET]
Event Date: 02/11/2018
Event Time: 22:03 [EST]
Last Update Date: 02/11/2018
Notification Time: 23:36 [ET]
Event Date: 02/11/2018
Event Time: 22:03 [EST]
Last Update Date: 02/11/2018
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):
RAY POWELL (R1DO)
RAY POWELL (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 | Y | 100 | Power Operation | 100 | Power Operation |
SECONDARY CONTAINMENT DIFFERENTIAL PRESSURE OUT OF SPECIFICATION
"On February 11, 2018 at 2203 [EST], the Susquehanna Control Room received indication that a loss of Secondary Containment Zone 2 differential pressure [DP] had occurred. Control Room operators noted a differential pressure of <.25" WC [inches Water Column] for several seconds. System DP was restored to normal in 1 minute. The cause of the pressure swings is under investigation.
"Zone 2 differential pressures being less than 0.25" WC constitutes a loss of Secondary Containment based on not meeting requirements of SR 3.6.4.1.1.
"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 February 11, 2018 at 2203 [EST], the Susquehanna Control Room received indication that a loss of Secondary Containment Zone 2 differential pressure [DP] had occurred. Control Room operators noted a differential pressure of <.25" WC [inches Water Column] for several seconds. System DP was restored to normal in 1 minute. The cause of the pressure swings is under investigation.
"Zone 2 differential pressures being less than 0.25" WC constitutes a loss of Secondary Containment based on not meeting requirements of SR 3.6.4.1.1.
"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.