Event Notification Report for January 03, 2012
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/02/2012 - 01/03/2012
EVENT NUMBERS
47566
Power Reactor
Event Number: 47566
Facility: COOK
Region: 3 State: MI
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MARK ESSIG
HQ OPS Officer: PETE SNYDER
Region: 3 State: MI
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MARK ESSIG
HQ OPS Officer: PETE SNYDER
Notification Date: 01/03/2012
Notification Time: 03:33 [ET]
Event Date: 01/03/2012
Event Time: 04:00 [EST]
Last Update Date: 01/04/2012
Notification Time: 03:33 [ET]
Event Date: 01/03/2012
Event Time: 04:00 [EST]
Last Update Date: 01/04/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
MARK RING (R3DO)
MARK RING (R3DO)
| 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 |
UNAVAILABILITY OF TECHNICAL SUPPORT CENTER VENTILATION DUE TO SCHEDULED MAINTENANCE
"At 0400 EST on Tuesday, January 3, 2012, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems will be removed from service for scheduled maintenance.
"Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary.
"TSC ventilation system maintenance is scheduled to be completed by 1500 EST on Tuesday, January 3, 2012.
"The licensee has notified the NRC Resident Inspector."
* * * UPDATE FROM BEN HUFFMAN TO DONALD NORWOOD AT 1645 EST ON 1/3/12 * * *
"The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1644 EST on 1/3/12."
The licensee notified the NRC Resident Inspector. Notified R3DO (Valos).
* * * UPDATE AT 0546 EST ON 1/4/12 FROM ESSIG TO HUFFMAN * * *
"UNAVAILABILITY OF TSC VENTILATION SYSTEM DUE TO DAMPER FAILURE
"This is an update to EN #47566.
"At 2300 EST on Tuesday, January 3, 2012, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration system volume damper 12-HV-TSC-SD-6, TSC Ventilation Normal Flow to and from Air Conditioner HV-TSC-AC-1 Volume Damper, did not reposition during surveillance 12-OHP-5030-028-007 TSC Ventilation Filtration System Functional Test. When the damper position was checked, damper remained open with system in Emergency mode. Per 12-OHP-5030-028-007, if any damper fails to reposition, the ventilation unit is considered non-functional.
"Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary. TSC ventilation system maintenance had previously been performed to clean, inspect, and lubricate linkages associated with this damper on 1-3-2012. That work was completed at approximately 1700 EST on 1-3-2012.
"Following discovery, maintenance was contacted and discovered the linkage was loose for 12-HV-TSC-SD-6. Maintenance adjusted the linkage and damper was retested satisfactory at 0311 EST on 1-4-2012. TSC functionality has been restored.
"The licensee has notified the NRC Resident Inspector.
"This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility."
R3DO (Valos) notified.
"At 0400 EST on Tuesday, January 3, 2012, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems will be removed from service for scheduled maintenance.
"Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary.
"TSC ventilation system maintenance is scheduled to be completed by 1500 EST on Tuesday, January 3, 2012.
"The licensee has notified the NRC Resident Inspector."
* * * UPDATE FROM BEN HUFFMAN TO DONALD NORWOOD AT 1645 EST ON 1/3/12 * * *
"The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1644 EST on 1/3/12."
The licensee notified the NRC Resident Inspector. Notified R3DO (Valos).
* * * UPDATE AT 0546 EST ON 1/4/12 FROM ESSIG TO HUFFMAN * * *
"UNAVAILABILITY OF TSC VENTILATION SYSTEM DUE TO DAMPER FAILURE
"This is an update to EN #47566.
"At 2300 EST on Tuesday, January 3, 2012, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration system volume damper 12-HV-TSC-SD-6, TSC Ventilation Normal Flow to and from Air Conditioner HV-TSC-AC-1 Volume Damper, did not reposition during surveillance 12-OHP-5030-028-007 TSC Ventilation Filtration System Functional Test. When the damper position was checked, damper remained open with system in Emergency mode. Per 12-OHP-5030-028-007, if any damper fails to reposition, the ventilation unit is considered non-functional.
"Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary. TSC ventilation system maintenance had previously been performed to clean, inspect, and lubricate linkages associated with this damper on 1-3-2012. That work was completed at approximately 1700 EST on 1-3-2012.
"Following discovery, maintenance was contacted and discovered the linkage was loose for 12-HV-TSC-SD-6. Maintenance adjusted the linkage and damper was retested satisfactory at 0311 EST on 1-4-2012. TSC functionality has been restored.
"The licensee has notified the NRC Resident Inspector.
"This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility."
R3DO (Valos) notified.