Event Notification Report for October 23, 2016
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/22/2016 - 10/23/2016
EVENT NUMBERS
52315
Power Reactor
Event Number: 52315
Facility: COOPER
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: CURTIS MARTIN
HQ OPS Officer: JOHN SHOEMAKER
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: CURTIS MARTIN
HQ OPS Officer: JOHN SHOEMAKER
Notification Date: 10/23/2016
Notification Time: 23:41 [ET]
Event Date: 10/23/2016
Event Time: 19:08 [CDT]
Last Update Date: 10/23/2016
Notification Time: 23:41 [ET]
Event Date: 10/23/2016
Event Time: 19:08 [CDT]
Last Update Date: 10/23/2016
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
JOHN KRAMER (R4DO)
JOHN KRAMER (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
CONTROL ROOM EMERGENCY VENTILATION FAN INOPERABLE DUE TO ELEVATED VIBRATION
"At 1908 CDT on 10/23/16, elevated vibration readings were identified on Cooper Nuclear Station [CNS], Control Room Emergency Filter System (CREFS) supply fan A. Vibration readings were evaluated by Engineering and were determined to be indicative of bearing failure on supply fan A. The Control Room declared CREFS inoperable and entered LCO 3.7.4, Condition A, which requires restoration of CREFS to operable status in 7 days. Repair activities have been initiated for this condition.
"The plant is currently in Mode 5, with refueling activities and OPDRVs [Operation with Potential to Drain Reactor Vessel] in progress. CNS is not currently in the mode of applicability for a USAR defined accident. This condition is being conservatively reported under 10 CFR 50.72(b)(3)(v)(D) as a single train safety system that is required to be OPERABLE during situations under which significant radioactive releases can be postulated."
The NRC Resident Inspector has been notified.
"At 1908 CDT on 10/23/16, elevated vibration readings were identified on Cooper Nuclear Station [CNS], Control Room Emergency Filter System (CREFS) supply fan A. Vibration readings were evaluated by Engineering and were determined to be indicative of bearing failure on supply fan A. The Control Room declared CREFS inoperable and entered LCO 3.7.4, Condition A, which requires restoration of CREFS to operable status in 7 days. Repair activities have been initiated for this condition.
"The plant is currently in Mode 5, with refueling activities and OPDRVs [Operation with Potential to Drain Reactor Vessel] in progress. CNS is not currently in the mode of applicability for a USAR defined accident. This condition is being conservatively reported under 10 CFR 50.72(b)(3)(v)(D) as a single train safety system that is required to be OPERABLE during situations under which significant radioactive releases can be postulated."
The NRC Resident Inspector has been notified.