Event Notification Report for November 24, 2013
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/23/2013 - 11/24/2013
EVENT NUMBERS
49575
Power Reactor
Event Number: 49575
Facility: FERMI
Region: 3 State: MI
Unit: [2] [] []
RX Type: [2] GE-4
NRC Notified By: MARK EGHIGIAN
HQ OPS Officer: MARK ABRAMOVITZ
Region: 3 State: MI
Unit: [2] [] []
RX Type: [2] GE-4
NRC Notified By: MARK EGHIGIAN
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 11/24/2013
Notification Time: 02:54 [ET]
Event Date: 11/24/2013
Event Time: 00:01 [EST]
Last Update Date: 11/24/2013
Notification Time: 02:54 [ET]
Event Date: 11/24/2013
Event Time: 00:01 [EST]
Last Update Date: 11/24/2013
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):
DAVID HILLS (R3DO)
DAVID HILLS (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
MOMENTARY LOSS OF REACTOR BUILDING VENTILATION
"On 11/24/2013 at 00:00:54 seconds [EST], Reactor Building ventilation tripped due to low outside air temperature. At 00:01:42 seconds, Secondary Containment Differential pressure went positive, with a maximum of +0.08 inches WC [water column]. This is a loss of Secondary Containment function. At 00:02:30 seconds, Standby Gas Treatment System was started and Secondary Containment pressure then decreased to <0 inches WC at 00:03:18 seconds. All the above data parameters were taken from the Division 2 Reactor Building Differential pressure recorder.
"Secondary Containment pressure is stable with differential pressure negative <-0.30 inches WC.
"The loss of Secondary Containment function is reportable under 10CFR 50.72(b)(3)(v)(c) as an event or condition that could have prevented the fulfillment of a safety function needed to control the release of radioactive material."
Technical Specification requirement are to maintain secondary containment pressure <-0.125 WC. No actual radiation release occurred during the event.
The licensee notified the NRC Resident Inspector.
"On 11/24/2013 at 00:00:54 seconds [EST], Reactor Building ventilation tripped due to low outside air temperature. At 00:01:42 seconds, Secondary Containment Differential pressure went positive, with a maximum of +0.08 inches WC [water column]. This is a loss of Secondary Containment function. At 00:02:30 seconds, Standby Gas Treatment System was started and Secondary Containment pressure then decreased to <0 inches WC at 00:03:18 seconds. All the above data parameters were taken from the Division 2 Reactor Building Differential pressure recorder.
"Secondary Containment pressure is stable with differential pressure negative <-0.30 inches WC.
"The loss of Secondary Containment function is reportable under 10CFR 50.72(b)(3)(v)(c) as an event or condition that could have prevented the fulfillment of a safety function needed to control the release of radioactive material."
Technical Specification requirement are to maintain secondary containment pressure <-0.125 WC. No actual radiation release occurred during the event.
The licensee notified the NRC Resident Inspector.