Event Notification Report for October 04, 2015
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/03/2015 - 10/04/2015
Power Reactor
Event Number: 51448
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: FRED PERKINS
HQ OPS Officer: STEVE SANDIN
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: FRED PERKINS
HQ OPS Officer: STEVE SANDIN
Notification Date: 10/04/2015
Notification Time: 10:03 [ET]
Event Date: 10/04/2015
Event Time: 09:32 [EDT]
Last Update Date: 10/04/2015
Notification Time: 10:03 [ET]
Event Date: 10/04/2015
Event Time: 09:32 [EDT]
Last Update Date: 10/04/2015
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
Person (Organization):
FRED BOWER (R1DO)
SCOTT MORRIS (NRR)
MICHELE EVANS (NRR)
DAN DORMAN (R1RA)
WILLIAM GOTT (IRD)
FRED BOWER (R1DO)
SCOTT MORRIS (NRR)
MICHELE EVANS (NRR)
DAN DORMAN (R1RA)
WILLIAM GOTT (IRD)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | N | 0 | Hot Shutdown | 0 | Hot Shutdown |
UNUSUAL EVENT DECLARED DUE TO IDENTIFIED RCS LEAKAGE > 25 GPM
At 0932 EDT on 10/4/15, the licensee declared an Unusual Event for identified RCS [Reactor Coolant System] leakage exceeding 25 gallons per minute [GPM], per EAL BU2, due to a relief valve leaking on the Shutdown Cooling System common header. The RCS leakage was within the capacity of the Charging System. At 0954 EDT the RCS leakage was terminated by isolating the Shutdown Cooling System. The cause of the relief valve failure is unknown and under investigation.
The RCS cooldown was terminated and both RCS loops were restored to service for decay heat removal using both Steam Generators and the Main Condenser. Current RCS temperature is 248 degrees F with RCS pressure at 248 psig. All offsite power and EDGs [Emergency Diesel Generators] are available.
The licensee intends to repair the relief valve to resume the RCS cooldown using the shutdown cooling system..
The licensee informed State and local agencies and the NRC Resident Inspector.
Notified DHS SWO, DHS NICC, FEMA, and Nuclear SSA via email.
* * * UPDATE AT 1115 EDT ON 10/04/15 FROM FRED PERKINS TO S. SANDIN * * *
The licensee terminated the Unusual Event at 1100 EDT, based on verification that the RCS leakage was stopped.
The licensee informed State and local agencies and the NRC Resident Inspector.
Notified R1DO (Bower), NRR EO (Morris), and IRD (Gott).
Notified DHS SWO, DHS NICC, FEMA, and Nuclear SSA via email.
At 0932 EDT on 10/4/15, the licensee declared an Unusual Event for identified RCS [Reactor Coolant System] leakage exceeding 25 gallons per minute [GPM], per EAL BU2, due to a relief valve leaking on the Shutdown Cooling System common header. The RCS leakage was within the capacity of the Charging System. At 0954 EDT the RCS leakage was terminated by isolating the Shutdown Cooling System. The cause of the relief valve failure is unknown and under investigation.
The RCS cooldown was terminated and both RCS loops were restored to service for decay heat removal using both Steam Generators and the Main Condenser. Current RCS temperature is 248 degrees F with RCS pressure at 248 psig. All offsite power and EDGs [Emergency Diesel Generators] are available.
The licensee intends to repair the relief valve to resume the RCS cooldown using the shutdown cooling system..
The licensee informed State and local agencies and the NRC Resident Inspector.
Notified DHS SWO, DHS NICC, FEMA, and Nuclear SSA via email.
* * * UPDATE AT 1115 EDT ON 10/04/15 FROM FRED PERKINS TO S. SANDIN * * *
The licensee terminated the Unusual Event at 1100 EDT, based on verification that the RCS leakage was stopped.
The licensee informed State and local agencies and the NRC Resident Inspector.
Notified R1DO (Bower), NRR EO (Morris), and IRD (Gott).
Notified DHS SWO, DHS NICC, FEMA, and Nuclear SSA via email.
Power Reactor
Event Number: 51449
Facility: FERMI
Region: 3 State: MI
Unit: [2] [] []
RX Type: [2] GE-4
NRC Notified By: BRETT JEBBIA
HQ OPS Officer: MARK ABRAMOVITZ
Region: 3 State: MI
Unit: [2] [] []
RX Type: [2] GE-4
NRC Notified By: BRETT JEBBIA
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 10/04/2015
Notification Time: 14:16 [ET]
Event Date: 10/04/2015
Event Time: 09:56 [EDT]
Last Update Date: 10/04/2015
Notification Time: 14:16 [ET]
Event Date: 10/04/2015
Event Time: 09:56 [EDT]
Last Update Date: 10/04/2015
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):
STEVE ORTH (R3DO)
STEVE ORTH (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | N | 0 | Refueling | 0 | Refueling |
SECONDARY CONTAINMENT INOPERABLE WITH THE POTENTIAL TO DRAIN THE REACTOR VESSEL
"On October 4th, at approximately 0956 EDT, 'Operations with the Potential to Drain the Reactor Pressure Vessel' (OPDRV) was unintentionally initiated without secondary containment operable. Operators promptly identified the condition and immediately initiated actions to identify and suspend the source of the drain path. At approximately 1120 EDT the source of the OPDRV was isolated. Reactor cavity water level and spent fuel pool level remained constant throughout the event. An investigation is in progress.
"The NRC Resident Inspector has been notified."
"On October 4th, at approximately 0956 EDT, 'Operations with the Potential to Drain the Reactor Pressure Vessel' (OPDRV) was unintentionally initiated without secondary containment operable. Operators promptly identified the condition and immediately initiated actions to identify and suspend the source of the drain path. At approximately 1120 EDT the source of the OPDRV was isolated. Reactor cavity water level and spent fuel pool level remained constant throughout the event. An investigation is in progress.
"The NRC Resident Inspector has been notified."