Event Notification Report for September 16, 2017
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/15/2017 - 09/16/2017
EVENT NUMBERS
52973
Power Reactor
Event Number: 52973
Facility: SUSQUEHANNA
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: LONNIE CRAWFORD
HQ OPS Officer: HOWIE CROUCH
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: LONNIE CRAWFORD
HQ OPS Officer: HOWIE CROUCH
Notification Date: 09/16/2017
Notification Time: 15:53 [ET]
Event Date: 09/16/2017
Event Time: 13:30 [EDT]
Last Update Date: 09/16/2017
Notification Time: 15:53 [ET]
Event Date: 09/16/2017
Event Time: 13:30 [EDT]
Last Update Date: 09/16/2017
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):
GLENN DENTEL (R1DO)
GLENN DENTEL (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 |
LOSS OF SECONDARY CONTAINMENT DIFFERENTIAL PRESSURE
"On September 16th, 2017 at 1330 hrs. [EDT], a loss of secondary containment differential pressure (D/P) occurred due to an equipment failure. This caused a reduction in Reactor Building Zone 2 (Unit 2) D/P to less than the required 0.25 inches WC per SR [Surveillance Requirement] 3.6.4.1.1.
"2V206B, Reactor Building Zone 2 Equipment Compartment Exhaust Fan, was manually started and Reactor Building Zone 2 D/P was restored to greater than 0.25 inches WC by 1333 hrs.
"Reactor Building Zone 1 (Unit 1) and Zone 3 (Units 1&2) ventilation remained in service and stable.
"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 has notified the NRC Resident Inspector.
"On September 16th, 2017 at 1330 hrs. [EDT], a loss of secondary containment differential pressure (D/P) occurred due to an equipment failure. This caused a reduction in Reactor Building Zone 2 (Unit 2) D/P to less than the required 0.25 inches WC per SR [Surveillance Requirement] 3.6.4.1.1.
"2V206B, Reactor Building Zone 2 Equipment Compartment Exhaust Fan, was manually started and Reactor Building Zone 2 D/P was restored to greater than 0.25 inches WC by 1333 hrs.
"Reactor Building Zone 1 (Unit 1) and Zone 3 (Units 1&2) ventilation remained in service and stable.
"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 has notified the NRC Resident Inspector.