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 Start dateReporting criterionTitleEvent descriptionSystemLER
ENS 486453 January 2013 08:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 0300 EST on Thursday, January 3, 2013, the DC 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 and post maintenance testing is scheduled to be completed by 2200 EST on January 3, 2013. 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.

  • * * UPDATE FROM GREGORY KANDA TO S. SANDIN ON 1/3/13 AT 2202 EST * * *

The TSC ventilation system maintenance and testing was completed satisfactorily and the system was restored to service at 2115 EST on 1/3/13. The licensee has notified the NRC Resident Inspector. Notified R3DO (Skokowski).

ENS 4850413 November 2012 14:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessPartial Loss of Emergency Assessment During Planned Modifications

Cook Nuclear Power Plant will begin a cyber security modification of Unit 1 and Unit 2 Plant Process Computers (PPCs) and associated network infrastructure on Tuesday, November 13, 2012 at 0900 EST. This includes the Emergency Response Data System (ERDS) communication with the NRC Operations Center. The entire PPC for each unit will be out of service and unavailable for approximately 6 hours. During that time, the PPC satellite display systems in the Control Rooms, TSC and EOF will be unavailable. After approximately 9 hours, the ERDS will be restored to service along with the satellite display systems in the Control Rooms, TSC and EOF. Compensatory measures exist within the DC Cook Emergency Response procedures to provide plant data in the event of an actual Emergency to the NRC Operations Center until the ERDS can be returned to service. Unavailability of the ERDS and Control Room, TSC and EOF data is being reported in accordance with 10 CFR 50.72(b)(3)(xiii) as a major loss of emergency assessment capability. The NRC Resident Inspector has been notified. A follow-up ENS communication will be made when both units ERDS are fully restored to service. Unit 1 and Unit 2 PPC availability is expected to be restored on Tuesday, November 13, 2012 at 1500 EST. ERDS communication with the NRC Operations Center is expected to be restored on November 13, 2012 at 1800 EST.

  • * * UPDATE FROM BRADDOCK LEWIS TO HOWIE CROUCH @ 1559 EST ON 11/13/12 * * *

The licensee notified the Operations Center that the PPC work was delayed and, as a consequence, ERDS restoration will be delayed. Work on the PPC continues. The licensee has notified the NRC Resident Inspector. Notified R3DO (Giessner) and ERDS Group (via email).

  • * * UPDATE AT 1908 EST ON 11/13/12 FROM GREG KANDA TO MARK ABRAMOVITZ * * *

ERDS was declared operable at 1815 EST. The licensee notified the NRC Resident Inspector. Notified R3DO (Giessner) and ERDS Group (via email).

Emergency Response Data System
ENS 4812019 July 2012 19:30:0010 CFR 50.72(b)(2)(i), Tech Spec Required ShutdownTech Spec Required Shutdown Due to Inability to Restore Main Steam Isolation Automatic Actuation Logic and Actuation Relays within the Required TimeAt 1530 on July 19, 2012, operators commenced shutdown of DC Cook Unit 1 to comply with LCO 3.3.2, Condition I when the 6 hour time limit to complete Condition C Required Action could not be completed. At 0734 on July 19, 2012, operators identified that power had been lost to two of four Steam Generator Stop Valve Dump Valves (Dump Valves) on one of the two trains. DC Cook entered LCO 3.3.2 Condition B for Function 4a, manual initiation: 'restore required channel or train to operable within 48 hours.' DC Cook also entered LCO 3.3.2 Condition C for Function 4b, automatic actuation logic and actuation relays: 'restore required channel or train to operable within 6 hours.' Power was restored to one Dump Valve which was then declared operable at 1030. Efforts continue to restore power to the remaining Dump Valve. Enforcement Discretion was verbally granted by the Nuclear Regulatory Commission at 1736 on July 19, 2012 to begin at 1934 and end at 1934 on July 20, 2012. Upon receiving the Enforcement Discretion, the power reduction was stopped at 1738 at 50% power. This event is reportable under 10CFR50.72(b)(2)(i), 'The initiation of any nuclear plant shutdown required by the plant's Technical Specifications,' as a four (4) hour report. The DC Cook Sr. Resident NRC Inspector has been notified.Steam Generator
ENS 480602 July 2012 06:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 02:00 EDT on Monday, July 2, 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 and post maintenance testing is scheduled to be completed by 15:00 EDT on Monday, July 2, 2012. 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.

  • * * UPDATE FROM BEN HUFFMAN TO DONG PARK AT 1727 EDT ON 7/2/12 * * *

The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1725 EDT on 7/2/12. The licensee will notify the NRC Resident Inspector.

Notified R3DO (Daley).

ENS 478811 May 2012 03:28:0010 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Due to Main Turbine TripOn 30 April, 2012, at 2328 (EDT), DC Cook Unit 2 Reactor automatically tripped due to a trip of the main turbine. The cause of the main turbine trip is still under investigation. The electrical grid is stable and Unit 2 is being supplied by offsite power. All control rods fully inserted. Decay heat is being removed via Steam Generator PORVs to atmosphere. Preliminary evaluation indicates all plant systems functioned normally following the reactor trip. DC Cook Unit 2 remains stable in Mode 3 while conducting the post trip review. No radioactive releases were experienced as a result of this event. This event is reportable under 10 CFR 50.72(b)(2)(iv)(B), Reactor Protection System (RPS) actuation, as a four (4) hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report. The DC Cook Resident NRC Inspector has been notified. The licensee stated that the trip was uncomplicated and the reactor is stable in mode 3 at no load temperature and pressure. The unit is on steam generator atmospheric relief valves because the secondary steam load on the plant was causing too much of a cool down. There is no primary to secondary steam generator leakage for the unit. The trip had no impact on Unit 1 which continues to operate at full power.Steam Generator
Reactor Protection System
Auxiliary Feedwater
Main Turbine
ENS 4786426 April 2012 02:46:0010 CFR 50.72(b)(2)(xi), Notification to Government Agency or News ReleaseNotification to Offsite Agencies Due to Oil SpillAt 2246 EDT on April 25, 2012, D.C. Cook notified the State of Michigan and local authorities of an oil spill from the Unit 2 (Main Generator) Seal Oil system at 2110 EDT which resulted in a portion of this oil entering the absorption pond, which is in the owner controlled area. An oil sheen is present on the absorption pond which has a surface area of approximately 2 acres (87,000 square feet) and it is estimated that five to ten gallons of oil are on the absorption pond. The NRC Resident Inspector was notified. The licensee has contained the oil leak and clean up efforts are ongoing.
ENS 478013 April 2012 12:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnit 2 Plant Process Computer Out-Of-Service for Planned Maintenance

The Unit 2 DC Cook Nuclear Plant (CNP) Plant Process Computer (PPC) will be removed from service on Tuesday, April 3, 2012 at 0800 EDT to support scheduled maintenance. This will cause the entire Unit 2 PPC, including the ERDS (Emergency Response Data System) to be unavailable to the NRC Operations Center. The planned maintenance also affects the Safety Parameter Display System (SPDS), the Real Time Data Repository (RDR), and PPC data to Emergency Response Facilities at CNP. The scheduled maintenance, returning of equipment to service, and post maintenance testing is expected to be completed by 0000 EDT on Wednesday, April 4, 2012. Compensatory measures exist within the DC Cook Emergency Response procedures to provide plant data via the Emergency Notification System to the NRC Operations Center until the ERDS can be returned to service. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to any event that results in a major loss of emergency assessment capability, offsite response capability, offsite communications capability (e.g. significant portion of control room indication, Emergency Notification System, or offsite notification system).

  • * * UPDATE FROM BRAD LEWIS TO CHARLES TEAL ON 4/3/12 AT 1536 EDT * * *

At time 1500 EDT, the Plant Process Computer and ERDS system has been restored to service. The licensee has notified the NRC Resident Inspector. Notified R3DO (Dickson).

Safety Parameter Display System
ENS 477941 April 2012 08:26:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 0445 EDT on Sunday, April 1, 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 and post maintenance testing is scheduled to be completed by 1900 EDT on Sunday, April 1, 2012. 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.

* * * UPDATE FROM DEAN BRUCK TO PETE SNYDER ON 4/1/12 AT 1633 EDT * * * 

The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1620 EDT on 4/1/12. The licensee will notify the NRC Resident Inspector. Notified R3DO (Dickson).

ENS 475663 January 2012 09:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability 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.

ENS 4747725 November 2011 10:23:0010 CFR 50.72(b)(3)(iv)(A), System ActuationAux Feedwater Pump Start After Main Feedwater Pump TripAt 0522 EST on November 25, 2011, operators manually started all Auxiliary Feedwater (AFW) pumps in response to a manual trip of the Unit 1 East Main Feedwater Pump due to bearing failure. Operators were responding to increasing vibrations on the East Main Feedwater Pump and reducing turbine load when the East Main Feedwater Pump was manually tripped (at approximately 90% power) due to high vibrations. Operators entered the abnormal operating procedure for Loss of One Main Feedwater Pump, which directs starting all three AFW pumps. Plant power was stabilized at approximately 58%. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10CFR50.72(b)(3)(iv)(A) due to the valid actuation of the AFW system in response to equipment failure.Feedwater
Auxiliary Feedwater
05000315/LER-2011-002
ENS 473174 October 2011 08:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 0400 EDT on Tuesday, October 4, 2011, 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 EDT on Tuesday, October 4, 2011. 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.

  • * * UPDATE FROM BUD HINCKLEY TO JOE O'HARA ON 10/04/11 AT 1443 * * *

The TSC ventilation system maintenance began at 0504 EDT on 10/04/11 and the system was restored to service at 1430 EDT on 10/04/11. The NRC Resident Inspector has been notified. Notified R3DO(Phillips)

ENS 472477 September 2011 12:54:0010 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Automatic Reactor Trip Following Main Turbine Trip from 100% PowerOn Sept 7, 2011, at 0854, DC Cook Unit 1 reactor automatically tripped due to a trip of the main turbine. The cause of the main turbine trip is still under investigation. This event is reportable under 10 CFR 50.72(b)(2)(iv)(B), Reactor Protection System (RPS) actuation, as a four (4) hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report. The DC Cook Sr. Resident NRC Inspector has been notified. The electrical grid is stable and Unit 1 is being supplied by offsite power. All control rods fully inserted. Decay heat is being removed via steam dumps to the main condenser. Preliminary evaluation indicates all plant systems functioned normally following the reactor trip. DC Cook Unit 1 remains stable in Mode 3 while conducting the post trip review.Reactor Protection System
Auxiliary Feedwater
Main Turbine
Main Condenser
05000315/LER-2011-001
ENS 4719423 August 2011 18:24:0010 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
10 CFR 50.72(a)(1)(i), Emergency Class Declaration
Notification of an Unusual Event Due to a Seismic Event

At 1424 (hrs. EDT) on Tuesday, August 23, 2011, an Unusual Event was declared for Unit 1 and Unit 2 based on Emergency Plan criterion N-1, 'Natural of Destructive Phenomena Inside the Protected Area'. The Unusual Event was declared following detection of ground motion by persons on site with confirmation based on United States Geological Survey information. Plant operation was not impacted by the event. Site structure and system inspections are in progress in accordance with the Abnormal Operating Procedure for earthquake. No damage has been identified. In accordance with Emergency Plan procedures, notifications of Berrien County and State of Michigan were completed. The licensee has notified the NRC Senior Resident Inspector. A follow-up notification will be made after the Unusual Event is terminated. This notification is being made in accordance with 10 CFR 50.72 (a)(1)(i) due to declaration of an emergency class.

  • * * UPDATE FROM SCOTT BURNS TO HOWIE CROUCH AT 1543 EDT ON 8/23/11 * * *

A press release has been issued regarding the seismic event. This notification update is being made in accordance with 10 CFR 50.72 (b)(2)(xi) for news release or notification of other government agency. Notifications were made to the following local media: St. Joseph Herald Palladium, South Bend Tribune, Niles Daily Star, WSJM Radio, WNDU TV, WSBT TV, and WSJV TV. Notification was also made to the Platt News Service. The licensee has notified the NRC Resident Inspector.

  • * * UPDATE FROM SCOTT BURNS TO ERIC SIMPSON AT 1859 EDT ON 8/23/11 * * *

The Unusual Event due to Seismic Event was terminated at 1723 EDT following an examination of plant systems which revealed no damage due to the seismic event. A press release has been issued regarding the termination of the Unusual Event. This notification update is being made to notify of the Unusual Event termination and also notify of the press release describing the Unusual Event termination in accordance with 10 CFR 50.72 (b)(2)(xi) for news release or notification of other government agency. The licensee has notified the NRC Resident Inspector and state and local authorities. Notified R3DO (Passehl), IRD (Gott), DHS (Flinter), FEMA (Via), USDA (Kraus), and DOE (Bailey).

ENS 4704011 July 2011 08:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 0400 EDT on Monday, July 11, 2011, 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 2000 EDT on Monday, July 11, 2011. 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.

  • * * UPDATE FROM DAN KURTH TO JOE O'HARA AT 2151 ON 7/11/11 * * *

TSC ventilation system maintenance was completed satisfactorily and the system restored to service at 1800 EDT on 7/11/11. The NRC Resident Inspector will be notified. Notified R3DO(Bloomer)

ENS 470256 July 2011 08:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 0400 EDT on Wednesday, July 6, 2011, 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 1600 EDT on Wednesday, July 6, 2011. 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.

* * * UPDATE FROM DEAN BRUCK TO PETE SNYDER ON 7/7/11 AT 1056 EDT * * * 

The TSC ventilation system maintenance was completed satisfactorily and the system restored to service at 1500 EDT on 7/6/11. The licensee notified the NRC Resident Inspector.

ENS 467316 April 2011 08:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessTechnical Support Center Ventilation System Out of Service Due to Planned Maintenance

At 0400 EDT on Wednesday, April 6, 2011, 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 1600 EDT on Wednesday, April 6, 2011. The licensee has notified the NRC Resident Inspector. This notification is being made in accordance with 10CFR50.72(b)(3)(xiii) due to the loss of an emergency response facility.

  • * * UPDATE FROM DEAN BRUCK TO DONG PARK ON 4/6/11 AT 1514 EDT * * *

The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1455 EDT. Notified R3DO (Daley).

ENS 465204 January 2011 13:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 0800 EST on Tuesday, January 4, 2011, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems were 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 1600 EST on Tuesday, January 4, 2011. 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,

  • * * UPDATE FROM BUD HINCKLEY TO DONALD NORWOOD AT 1709 EST ON 01/04/2011 * * *

The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1705 EST. The licensee will notify the NRC Resident Inspector. Notified the R3DO (Lipa) via e-mail.

ENS 4647714 December 2010 02:19:0010 CFR 50.72(b)(3)(iv)(A), System ActuationManual Actuation of Auxiliary Feedwater System in Response to Loss of One Main Feedwater PumpAt 2119 EST on December 13, 2010, operators manually started all Auxiliary Feedwater (AFW) pumps in response to a loss of the Unit 1 East Main Feedwater Pump. Operators were responding to decreasing condenser vacuum on the East Main Feedwater Pump and reducing turbine load when the East Main Feedwater Pump was manually tripped at approximately 21 inches of vacuum Hg. Operators entered the abnormal operating procedure for Loss of One Main Feedwater Pump, which directs starting all three AFW pumps. Plant power was stabilized at approximately 49%. The licensee will be notifying the NRC Senior Resident Inspector. This notification is being made in accordance with 10CFR50.72(b)(3)(iv)(A) due to the valid actuation of the AFW system in response to equipment failure. No maintenance was in progress, and the cause of the decreasing condenser vacuum in the MFP was due to debris in the traveling water screen.Feedwater
Auxiliary Feedwater
05000315/LER-2010-003
ENS 4633918 October 2010 14:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Emergency Response Data System (Erds) for Scheduled Maintenance

At approximately 10:00 a.m. on Monday, October 18, 2010, the Cook Nuclear Plant (CNP) Unit 2 Plant Process Computer (PPC) will be removed from service for scheduled power supply distribution panel preventive maintenance. This will remove Unit 2 PPC data input to ERDS rendering the system non functional for providing data to the NRC Operations Center. The scheduled maintenance will also affect the Safety Parameter Display System (SPDS), the Real Time Data Repository (RDR), and PPC data to Emergency Response Facilities at CNP. The scheduled maintenance is expected to take up to 6 hours to complete. Compensatory measures exist within the CNP Emergency Response procedure to provide plant data via the Emergency Notification System to the NRC Operations Center until the ERDS can be returned to service. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to any event that results in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability (e.g., significant portion of control room indication, Emergency Notification System, or offsite notification system). CNP Unit 2 is currently defueled.

  • * * UPDATE FROM DEAN BRUCK TO JOE O'HARA AT 1518 EDT ON 10/18/10 * * *

Functionality has been restored to ERDS following restoration of the Unit 2 PPC at 1422. SPDS, RDR, and PPC data to Emergency Response Facilities at CNP have also been restored to service at 1422. The NRC Resident Inspector has been notified. Notified R3DO(Orth).

Emergency Response Data System
Safety Parameter Display System
ENS 463106 October 2010 11:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 0700 on Wednesday, October 6, 2010, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems have been 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 1600 on Wednesday, October 6, 2010. 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.

  • * * UPDATE AT 1738 ON 10/6/2010 FROM BRADDOCK LEWIS TO BILL HUFFMAN * * *

TSC ventilation was returned to service at 1645 EDT. The licensee notified the NRC Resident Inspector. Notified the R3DO (Passehl).

ENS 463116 October 2010 04:08:0010 CFR 50.72(b)(3)(iv)(A), System ActuationValid Actuation of Auxiliary Feedwater System in Response to Valid Steam Generator Low-Low Level SignalsAt 0008 on Wednesday, October 6, 2010, Cook Nuclear Plant (CNP) Unit 2 had a Valid Automatic Actuation of the Unit 2 Turbine Driven Auxiliary Feedwater Pump. Cook Nuclear Plant Unit 2 Reactor had been manually tripped at 0001 from 14% power per normal operating procedures in preparation for the Unit 2 refueling outage. Following the reactor trip, water level in steam generators 23 and 24 lowered to 21% causing an automatic start of the Unit 2 Turbine Driven Auxiliary Feedwater Pump. Manual operator actions were in progress to restore steam generator water levels at the time of the actuation. The Turbine Driven Auxiliary Feedwater Pump operated normally to provide auxiliary feedwater flow to all four Unit 2 steam generators, and steam generator levels were restored to normal post trip values. Prior to the trip of Unit 2 reactor, the Unit 2 East and West Motor Driven Auxiliary Feedwater Pumps were manually started per procedure, as part of the pre-planned reactor trip, to control steam generator water levels. The cause of the low steam generator levels is still under investigation. The licensee has notified the NRC Resident Inspector.Steam Generator
Auxiliary Feedwater
05000316/LER-2010-001
ENS 462348 September 2010 11:47:0010 CFR 50.72(b)(2)(xi), Notification to Government Agency or News ReleaseOffsite Notification Due to Body Discovered in the Owner Controlled AreaAt 0747 hours on September 8, 2010, a body was discovered on the beach along the Owner Controlled Area at the Cook Nuclear Plant. Local law enforcement agencies have been notified. It is expected that a press release will be issued from local law enforcement. The NRC Senior Resident Inspector was notified. Plant operation was not impacted by the event. The fatality did not occur on site. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) due to notification of offsite agencies and expected media involvement related to the discovery. Although unconfirmed, the licensee believes that the body belongs to a person that went missing on the lake last week. The licensee notified Lake Township, Berrien County Sheriffs Office, Federal Bureau of Investigation and the U.S. Coast Guard. Either Berrien County or Lake Township will be issuing a press release.
ENS 4608913 July 2010 12:10:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System Due to Scheduled Maintenance

At 0810 EDT on Tuesday, July 13, 2010, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems have been 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 1800 EDT on Tuesday, July 13, 2010. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10CFR50.72(b)(3)(xiii) due to the loss of an emergency response facility.

* * * UPDATE FROM DEAN BRUCK TO CHARLES TEAL ON 7/13/10 AT 1730 EDT * * * 

The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1730 EDT. Notified R3DO (Dickson).

ENS 4603723 June 2010 18:28:0010 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
10 CFR 50.72(a)(1)(i), Emergency Class Declaration
Declaration of Unusual Event Due to Seismic Event

At 1428 (EDT) on Wednesday, June 23, 2010, an Unusual Event was declared for Unit 1 and Unit 2 based on Emergency Plan criterion N-1 'Natural or Destructive Phenomena Inside the Protected Area'. The Unusual Event was declared following detection of ground motion by persons on site, with confirmation based on United States Geological Survey information. Plant operation was not impacted by the event. Site structure and system inspections are in progress in accordance with the Abnormal Operating Procedure for Earthquake. No damage has been identified. In accordance with Emergency Plan procedures, notifications of Berrien County and State of Michigan were completed. The licensee has notified the NRC Senior Resident Inspector. A follow-up notification will be made after the Unusual Event is terminated. This notification is being made in accordance with 10 CPR 50.72 (a)(1)(i) due to declaration of an emergency class.

  • * * UPDATE AT 1645 EDT ON 06/23/10 FROM JAMES SHAW TO S. SANDIN * * *

The licensee provided the following information as an update: A press release has been issued regarding the seismic event. This notification update is being made in accordance with 10 CFR 50.72 (b)(2)(xi) for news release or notification of other government agency. The licensee informed state/local agencies and the NRC Resident Inspector. Notified R3DO (Lara).

  • * * UPDATE AT 2017 EDT ON 6/23/2010 FROM TIMOTHY WICE TO MARK ABRAMOVITZ * * *

The Unusual Event due to Seismic Event was terminated at 1955 EDT following an examination of plant systems which revealed no damage due to the seismic event. A press release has been issued regarding the termination of the Unusual Event. This notification update is being made to notify of the Unusual Event termination and also notify of the press release describing the Unusual Event termination in accordance with 10 CFR 50.72 (b)(2)(xi) for news release or notification of other government agency. The licensee notified state/local agencies and the NRC Resident Inspector. Notified the R3DO (Lara), NRR EO (Cunningham), DHS (Inzer), and FEMA (Hollis).

ENS 458932 May 2010 12:58:0010 CFR 50.72(b)(3)(iv)(A), System ActuationManual Actuation of Auxiliary Feedwater System in Response to Loss of One Main Feedwater PumpAt 0858 (EDT) on Sunday, May 2, 2010, operators manually started all Auxiliary Feedwater (AFW) pumps in response to a loss of the East Main Feedwater Pump (EMFP). Operators were responding to high bearing temperatures on the EMFP, and had entered the Rapid Power Reduction Procedure, when they received EMFP Hi and Hi-Hi vibration alarms and reports of oil leaking from the EMFP. Operators entered the procedure for Loss of One Main Feed Pump, which directs starting the AFW pumps, and removed the EMFP from service. The plant was stabilized at approximately 49% power. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10CFR50.72(b)(3)(iv)(A) due to the valid actuation of the AFW system in response to equipment failure.Feedwater
Auxiliary Feedwater
05000315/LER-2010-002
ENS 4583112 April 2010 08:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessScheduled Maintenance on the Technical Support Center Ventilation System

At 04:00 on Monday, April 12, 2010, 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 22:00 on Monday, April 12, 2010. The licensee has notified the NRC Senior 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.

  • * * UPDATE FROM SCOTT SCHNEIDER TO CHARLES TEAL AT 1545 EDT ON 4/12/2010 * * *

The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1415. The NRC resident inspector has been informed. Notified R3DO (Orth).

ENS 4569815 February 2010 14:30:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Emergency Response Data System (Erds) Due to Plant Process Computer (Ppc) Scheduled Maintenance

At 0930 on Monday, February 15, 2010, the Cook Nuclear Plant (CNP) Unit 2 Plant Process Computer will be removed from service for scheduled maintenance for data backup and preventative maintenance which will take ERDS out of service to the NRC Operations Center. The scheduled maintenance will affect the Safety Parameter Display System (SPDS) and the Real Time Data Repository (RDR), PPC data to Emergency Response Facilities at CNP. The scheduled maintenance is expected to take up to 6 hours to complete. Compensatory measures exist within the CNP Emergency Response procedure to provide plant data via the Emergency Notification System to the NRC Operations Center until the ERDS can be returned to service. The licensee notified the NRC Resident Inspector 2/15/2010 at 8:45 a.m. This notification is being made in accordance with NUREG 1022 Revision 2 for CFR 50.72 (b)(3)(xiii) due any event that results in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability (e.g., significant portion of control room indication, Emergency Notification System, or offsite notification system). The unit is expected to be maintained at 100% during the maintenance evolution. PPC trending and indication and rod position monitor will be out of service (OOS) while the PPC is OOS.

  • * * UPDATE FROM BRAD LEWIS TO DONALD NORWOOD AT 1205 EST ON 2/15/2010 * * *

The DC Cook U-2 Plant Process Computer was returned to service and a fully operable and available status at 1144 EST on 2/15/2010. The licensee notified the NRC Resident Inspector. Notified R3DO (Peterson) via E-mail.

Emergency Response Data System
Safety Parameter Display System
ENS 4565325 January 2010 14:30:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessEmergency Response Data System Unavailable Due to Plant Process Computer Maintenance

At 0930 on Monday, January 25, 2010, the Cook Nuclear Plant (CNP) Unit 1 Plant Process Computer (PPC) will be removed from service for scheduled maintenance which will take the Emergency Response Data System (ERDS) out of service. The scheduled maintenance is planned from 0930 hours EST until 1530 hours EST. Personnel will be performing computer system backups and maintenance. Compensatory measures exist within the CNP Emergency Response procedure to provide plant data via the Emergency Notification System until the ERDS can be returned to service. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with NUREG 1022 Revision 2 for CFR 50.72(b)(3)(xiii) due to any event that results in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability (e.g., significant portion of control room indication, Emergency Notification System, or offsite notification system).

  • * * UPDATE FROM RICH KRESS TO JOE O'HARA AT 1207 EST ON 1/25/10 * * *

The Unit 1 Plant Process Computer and the Emergency Response Data System (ERDS) were returned to functional Status at 11:35 on Monday, January 25, 2010. This follow up notification is being made to provide closure from the initial notification under CFR 50.72 (b)(3)(xiii) due to any event that results in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability (e.g., significant portion of control room indication, Emergency Notification System, or offsite notification system). The NRC Resident Inspector has been notified. Notified R3DO(Lipa)

Emergency Response Data System
ENS 4562012 January 2010 09:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System and Charcoal Filter for Scheduled Maintenance

The Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system air conditioning and filtration systems are scheduled to be removed from service for scheduled preventive maintenance at 0400 on January 12, 2010. Under certain accident conditions, the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. The TSC ventilation system air conditioning and filtration systems are scheduled to be restored to service by 1400 on Tuesday January 12, 2010. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to unavailability of an emergency response facility.

  • * * UPDATE FROM BEN HUFFMAN TO HOWIE CROUCH @ 1420 EST ON 01/12/10 * * *

The TSC ventilation system and charcoal filter were returned to functional status at 1418 EST on Tuesday, January 12, 2010. This follow up notification is being made to provide closure of the initial notification under 10 CFR 50.72 (b)(3)(xiii). The licensee has notified the NRC Resident Inspector. Notified R3DO (Lipa).

ENS 4545422 October 2009 04:01:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessTechnical Support Center Out of Service for Ventilation System and Charcoal Filter Maintenance

At 0001 on Thursday, October 22, 2009, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system air conditioning and filtration systems will be removed from service for a scheduled maintenance activity. The Motor Control Center providing electrical power to several TSC ventilation components will be de-energized to facilitate replacement of the U1 CD Emergency Diesel Generator room ventilation supply fan starter (1-88X-DGS-2). Under certain accident conditions the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. The TSC ventilation system availability is scheduled to be restored at 0800 on Thursday, October 22, 2009. 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 unavailability of an emergency response facility.

  • * * UPDATE AT 1008 ON 10/22/2009 FROM DAN KURTH TO MARK ABRAMOVITZ * * *

The TSC ventilation was restored to service at 0937 EDT. The licensee will notify the NRC Resident Inspector. Notified the R3DO (Kozak).

Emergency Diesel Generator
ENS 4542913 October 2009 11:44:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessTechnical Support Center Unavailable Due to Planned Maintenance

At 0744 (EDT) on Tuesday, October 13, 2009, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems were 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 at 1500 (EDT) on Tuesday, October 13, 2009. This notification is being made in accordance with 10CFR50.72(b)(3)(xiii) due to the loss of an emergency response facility. The licensee notified the NRC Senior Resident Inspector.

  • * * UPDATE FROM BUD HINCKLEY TO DONALD NORWOOD AT 1336 EDT ON 10/13/09 * * *

The CNP TSC ventilation system was returned to functional status following scheduled maintenance at 1333 (EDT) on Tuesday, October 13, 2009. This follow-up notification is being made to provide closure from the initial notification under 10CFR50.72.(b)(3)(xiii) due to the loss of an emergency response facility. The licensee has notified the NRC Senior Resident Inspector of the return to service of the TSC Ventilation System. Notified R3DO (Eric Duncan)

ENS 4536118 September 2009 14:30:0010 CFR 50.72(b)(3)(ii)(B), Unanalyzed ConditionInoperability of Both Edg'S Due to Valve Found Out of Position

At 02:00 on Friday, September 18, 2009, the Unit 2 AB Emergency Diesel Generator (EDG) Air Jet Assist Control Air Shutoff valve, which is required to be open, was discovered closed. At 10:30 on Friday, September 18, 2009, it was determined that with the valve closed, the EDG Air Jet Assist may not be able to support the EDG fast speed start to meet the EDG's Operability requirements. This condition renders the Unit 2 AB EDG inoperable. The valve was repositioned and verified open at 02:15 on Friday, September 18, 2009, restoring the EDG to operable status. Similar valves were verified to be in the correct position on all other EDGs in both Units. The Unit 2 AB Emergency Diesel Generator Air Jet Assist Control Air Shutoff valve was last confirmed open on July 21, 2009. The time the valve became closed is not known. Since July 21, 2009, there have been 3 periods of inoperability for Unit 2 CD EDG, the redundant Emergency Diesel Generator. During each of these periods, both of the Unit 2 EDGs are assumed to be inoperable. The periods are as follows: August 10, 2009 at 09:31 until August 10, 2009 at 23:00 August 11, 2009 at 07:30 until August 11, 2009 at 23:16 September 9, 2009 al 00:02 until September 9, 2009 at 04:40 This notification is being made in accordance with 10 CFR 50.72 (b)(3)(ii)(B) due to the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety. The licensee has notified the NRC Senior Resident Inspector.

  • * * RETRACTION ON 10/01/2009 AT 1634 EDT FROM JAMES SHAW TO DONALD NORWOOD * * *

At 02:00 on Friday, September 18, 2009, the Unit 2 AB Emergency Diesel Generator (EDG) Air Jet Assist Control Air Shutoff valve, which is required to be open, was discovered closed. At 10:30 on Friday, September 18, 2009, it was determined that with the valve closed, the EDG Air Jet Assist may not be able to support the EDG fast speed start to meet the EDG's Operability requirements. This condition renders the Unit 2 AB EDG inoperable. The valve was repositioned and verified open at 02:15 on Friday, September 18, 2009, restoring the EDG to operable status. Since the last time the Turbocharger Air Jet Assist Control Air Shutoff valve was confirmed open, July 21, 2009, there were three periods where the redundant EDG was inoperable for planned maintenance and surveillance testing. During each of these periods, both of the Unit 2 EDGs are assumed to be inoperable. As such, Cook Nuclear Plant (CNP) submitted Event Notification 45361 in accordance with 10CFR50.72(b)(3)(ii)(B) due to the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety. On September 25, 2009, CNP conducted two EDG fast speed starts, one with the Turbocharger Air Jet Assist Control Air Shutoff valve closed, and one with the valve open. Based on a review of the data collected and observed performance of the EDG, the determination has been made that having the Turbocharger Air Jet Assist Control Air valve closed does not adversely impact operability of an EDG. The circumstances discussed in the notification did not result in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety. The licensee has notified the NRC Resident Inspector. Notified R3DO (Lara).

Emergency Diesel Generator
ENS 4531131 August 2009 11:21:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessTsc Potentially Out of Service

At 0721 on Monday, August 31, 2009, a portion of the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system and Technical Support Center (TSC) air conditioning system was removed from service for maintenance on the electrical power supply Motor Control Center (MCC). The MCC being removed supports 3 of the 4 air conditioning units for the Technical Support Center, as well as the filtration system. The remaining air conditioning unit which is not supported by the MCC will remain in service. Under certain accident conditions the TSC may become unavailable due to the inability of the ventilation system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. The TSC ventilation system maintenance is scheduled to complete at 2100 on Monday, August 31, 2009. The licensee has notified the NRC Senior 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.

  • * * UPDATE AT 2147 EDT ON 8/31/09 FROM BRUCK TO HUFFMAN * * *

The TSC ventilation system air conditioning was returned to functional status at 21:37 on Monday, August 31, 2009. This follow up notification is being made to provide closure from the initial notification under 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility. The licensee has notified the NRC Resident Inspector. R3DO (Lipa) notified.

ENS 4522826 July 2009 19:06:0010 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Manual Reactor Trip Due to a Reactor Coolant Pump Seal MalfunctionAt 1506 on Sunday, July 26, 2009, the Cook Nuclear Plant (CNP) Unit 2 reactor was manually tripped after the control room staff concluded that the #22 Reactor Coolant Pump (RCP) needed to be promptly secured due to a RCP seal malfunction as indicated by lowering #1 seal leakoff flows and rising #1 seal return and pump radial bearing temperature. This requires a 4-hour report under 10CFR50.72(b)(2)(iv)(B). Both motor-driven Auxiliary Feedwater pumps automatically started due to the reactor trip and trip of both Main Feedwater Pumps. The Turbine-Driven Auxiliary Feedwater Pump (TDAFP) started automatically due to low-low water levels in at least two steam generators, which is expected for a reactor trip from approximately full power. The automatic actuation of the reactor protection system and the TDAFP require an 8-hour report under 10CFR50.72(b)(3)(iv)(A). All systems functioned as expected after the trip, and no major components were out of service at the time except for the Moisture Separator Reheaters which were not in service since the beginning of the current power cycle. The licensee has notified the NRC Senior Resident Inspector. All control rods fully inserted as required. Electrical system is in normal post-trip lineup. Plant cooldown is via Condenser Steam Dumps using Auxiliary Feedwater pumps. Plant cooldown will continue to Mode 5 (cold shutdown).Steam Generator
Feedwater
Reactor Protection System
Auxiliary Feedwater
ENS 451856 July 2009 11:12:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System and Charcoal Filter for Scheduled Maintenance

At 0712 on Monday, July 6, 2009, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system air conditioning and filtration systems were removed from service for scheduled preventive maintenance. Under certain accident conditions the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. The TSC ventilation system maintenance is scheduled to complete at 1600 on Monday, July 6, 2009. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility.

  • * * UPDATE FROM JAMES SHAW TO JOE O'HARA AT 1640 EDT ON 07/06/09 * * *

The TSC Ventilation System and Charcoal Filter have been returned to functional status at 1517 EDT on Monday, July 6, 2009. This follow up notification is being made to provide closure from the initial notification under 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility. The licensee has notified the NRC Senior Resident Inspector - Jay Lennartz. Notified the R3DO(Passehl).

ENS 4499215 April 2009 08:15:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System and Charcoal Filter During Scheduled Maintenance

At 0415 on Wednesday, April 15, 2009, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system and charcoal filter was removed from service for scheduled preventive maintenance. The charcoal bed filtration system is also out of service in support of the maintenance on the TSC ventilation system. Under certain accident conditions the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. The TSC ventilation system maintenance is scheduled to complete at 1600 on Wednesday, April 15, 2009. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility.

  • * * UPDATE FROM DEAN BRUCK TO JOHN KNOKE AT 1352 ON 4/15/09 * * *

At 1255 on Wednesday, April 15, 2009 the planned maintenance and testing was completed. The TSC ventilation system and charcoal filter have been returned to service restoring full availability to the TSC. The licensee has notified the NRC Senior Resident Inspector." Notified R3DO (Laura Kozak)

ENS 4476513 January 2009 14:07:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessTechnical Support Center Unavailable Due to Scheduled Hvac Maintenance

At 0907 on Tuesday, January 13, 2009, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems were 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. Ventilation system maintenance is scheduled to complete at 1500 on Tuesday, January 13, 2009. The licensee has notified the NRC Senior 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.

* * * UPDATE FROM SCOTT SCHNEIDER TO PETE SNYDER AT 1534 ON 1/13/09 * * * 

The TSC ventilation system air conditioning was returned to functional status at 1532 on Tuesday, January 13, 2009. This follow up notification is being made to provide closure from the initial notification under 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility. The licensee notified the NRC Resident Inspector." Notified R3DO (Passehl).

ENS 4457016 October 2008 15:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessPartial Unavailability of Tsc Ventilation Air Conditioning System for Scheduled Maintenance

At 1100 on Thursday, October 16, 2008, a portion of the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system air conditioning was removed from service for maintenance on the Non-Essential Service Water System (NESW). The NESW system supports 3 of the 4 air conditioning units for the Technical Support Center. The filtration system will remain available, and an air conditioning unit which is not supported by NESW will remain in service. Under certain accident conditions the TSC may become unavailable due to the inability of the ventilation system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. The TSC ventilation system maintenance is scheduled to complete at 1800 on Thursday, October 16, 2008. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility.

* * * UPDATE ON 10/17/08 AT 0526 FROM BEN HUFFMAN TO PETE SNYDER * * * 

The TSC ventilation system air conditioning was returned to functional status at 0525 on Friday, October 17, 2008. This follow up notification is being made to provide closure from the initial notification under 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility. The licensee notified the NRC Resident Inspector. Notified R3DO (Phillips).

Service water
ENS 445426 October 2008 08:45:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Tsc Ventilation System and Charcoal Filter for Scheduled Maintenance

At 0445 on Monday, October 6, 2008, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system and charcoal filter was removed from service for scheduled preventive maintenance. The charcoal bed filtration system is also out of service in support of the maintenance on the TSC ventilation system. Under certain accident conditions the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. The TSC ventilation system maintenance is scheduled to complete at 16:00 on Monday, October 6,2008. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility.

  • * * UPDATE AT 1630 EDT ON 10/06/08 FROM TOD KASPAR TO HOWIE CROUCH * * *

The TSC Ventilation System and Charcoal Filter was returned to functional status at 14:35 on Monday, October 6, 2008. This follow up notification is being made to provide closure from the initial notification under 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility. The licensee has notified the NRC Resident Inspector. Notified R3DO (Lara).

ENS 4450721 September 2008 00:18:0010 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
10 CFR 50.72(a)(1)(i), Emergency Class Declaration
10 CFR 50.72(b)(3)(iv)(A), System Actuation
Unit 1 Manual Reactor Trip from 100% Power Due to a Fire in the Main Turbine

D.C. Cook Unit 1 declared an Unusual Event (EAL H4 & H5) due to a fire in the Main Turbine. The reactor was manually tripped from 100 percent. The fire occurred at the upper level of the turbine building (Level 633), and was extinguished by the fire suppression system and local fire brigade. Three fire pumps are running at this time. No injuries were reported. All rods fully inserted, auxiliary feed water initiated and decay heat is being removed via atmospheric relief valves. Unit 1 is currently shutdown and stable in Mode 3, Hot Standby. Main steam stop valves are closed. Main condenser vacuum was broke. Unit 2 was not affected. All Unit 1 safety-related equipment is in-service and available. The licensee is currently assessing the extent of damage. The licensee will inform the NRC Resident Inspector. Notified DOE (Morrone), USDA (Shaf) and HHS (Mammarelli) that the NRC entered Monitoring Mode at 2045 EDT.

  • * * UPDATE AT 0005 EDT ON 09/21/08 FROM BRADDOCK LEWIS TO V. KLCO * * *

On September 20, 2008 at 20:05 the DC Cook Unit 1 Reactor was manually tripped after a malfunction occurred on the main turbine generator causing high vibration. A fire in the Unit 1 Main Generator resulted from this malfunction. A Notification of Unusual Event was declared September 20, 2008 at 20:18 due to Event classifications H-4, Fire within the protected area not extinguished within 15 minutes and H-5, Toxic or Flammable gas release affecting plant operation. The Unit 1 Main Generator Fire was reported extinguished at September 20, 2008 at 20:28. The Unit 1 plant trip was uncomplicated and all Automatic Control systems functioned as expected. All control rods inserted on the Reactor trip. The Turbine and both Motor Driven Auxiliary Feedwater pumps automatically started and fed all four Steam Generators as designed. The Steam Generator Stop Valves were manually closed to arrest plant cooldown. The cause of the Main Generator fire has not yet been determined, but the investigation is ongoing. No radiological release resulted from this event. This event is being reported as a four hour report required by 10CFR50.72(b)(2)(iv)(B) due to the Reactor Protection System automatic actuation and as an eight hour report required by 10CFR50.72(b)(3)(iv)(A) for the automatic actuation of the Auxiliary Feedwater system. The Notification of Unusual Event was reported separately. Unit 1 is stable in Mode 3. Shutdown Margin was satisfactorily verified. The main condenser was isolated as the primary heat sink. Steam Generator Power Operated Relief Valves are removing core decay heat in automatic control due to breaking main condenser vacuum. Main condenser vacuum was broken to stop the Unit 1 main turbine generator due to high vibration. Preparations are in progress to cooldown Unit 1 to Mode 5, Cold Shutdown. The Fire Suppression Water System was actuated and one of two 565,000 gallon tanks was drained. The second 565,000 gallon Fire Suppression Water tank was placed in service to restore the Fire Suppression Water system function. The licensee notified the NRC Resident Inspector, local and state authorities. The licensee will likely make a press release. Notified R3RA (Caldwell), R3DO (Stone), NRR (Leeds and Galloway) IRD (McDermott), DHS (Gomez) and FEMA (Kuzia).

  • * * UPDATE PROVIDED BY PAUL LEONARD TO JASON KOZAL AT 0414 ON 09/21/08 * * *

At 0409 the licensee terminated from the Notice of Unusual Event. The licensee has established the forced outage recovery team. No fires exist and no conditions conducive to fires exist due to the event. The licensee has established the integrity of the fire protection system. Notified R3RA (Caldwell), R3DO (Stone), NRR (Galloway), IRD (Grant), DHS (Jason), DOE (Maroni), FEMA (Sweetser), USDA (Phillip), and HHS (Nathan).

Steam Generator
Reactor Protection System
Auxiliary Feedwater
Main Turbine
Main Condenser
ENS 443907 August 2008 16:15:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Technical Support Center

At 1215 EDT on Thursday, August 7, 2008, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system charcoal filter was removed from service for scheduled preventive maintenance on one of the TSC air conditioning systems. The charcoal bed filtration system is also out of service in support of the maintenance on the air conditioning system. Under certain accident conditions the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. Air conditioning system maintenance is scheduled to complete at 1515 EDT on Thursday, August 7, 2008. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility. The licensee has notified the NRC Resident Inspector.

  • * * UPDATE FROM BRAD LEWIS TO JOHN KNOKE AT 1657 EDT ON 08/07/08 * * *

The TSC air conditioning system was returned to functional status at 16:25 on Thursday, August 7, 2008. This follow up notification is being made to provide closure from the initial notification under 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility. The licensee has notified the NRC Resident Inspector. Notified R3DO (David Hills)

ENS 4436525 July 2008 13:17:0010 CFR 26.719Positive Random Fitness for Duty TestA non-licensed employee supervisor had a confirmed positive for alcohol during a random fitness-for-duty test. The employee's access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector. This event is being reported pursuant to 10 CFR 26.719 (b)(2)(ii).
ENS 4432427 June 2008 19:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessProcedure Change Initiated to Support Tsc Habitability Dose CalculationAt 1500 on Friday, June 27, 2008, upon review of a calculation performed to demonstrate the TSC habitability requirements; a determination was made that a procedure change was required to support the assumptions in the calculation. The identified procedure change was effective at 1800 on June 27, 2008. Based on implementation of the procedure change, the TSC is now considered functional, but degraded. This issue has been entered into the Corrective Action Program. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility.
ENS 4431123 June 2008 07:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessLoss of Emergency Response Capability - Tsc Is Unavailable

UNAVAILABILITY OF TSC CHARCOAL FILTER FOR SCHEDULED MAINTENANCE At 0300 on Monday, June 23,2008, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system charcoal filter was removed from service for planned charcoal bed maintenance. The balance of the TSC ventilation is not affected by the charcoal bed maintenance and remains available. Under certain accident conditions the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. Charcoal filter maintenance is scheduled to complete at 1000 on Wednesday, June 25, 2008. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility.

  • * * UPDATE AT 1455EDT ON 06/24/08 FROM SCOTT SCHNEIDER TO S. SANDIN * * *

At 0905 on Tuesday, June 24, 2008, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system charcoal filter was removed from service for planned charcoal bed maintenance. The balance of the TSC ventilation is not affected by the charcoal bed maintenance and remains available. The charcoal filter was removed from service at 0300 on Monday, June 23, 2008 (as previously reported via EN # 44311), and subsequently restored to available status at 1614. Under certain accident conditions the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. Charcoal filter maintenance is scheduled to complete at 1300 on Wednesday, June 25, 2008. The licensee has notified the NRC Senior Resident Inspector. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss an emergency response facility. Notified R3DO (Lipa).

  • * * UPDATE PROVIDED BY DEAN BRUCK TO JASON KOZAL AT 1846 ON 6/27/08 * * *

The planned maintenance and testing was completed. The TSC Ventilation system was returned to service at 2045 EDT on 06/26/08. The licensee notified the NRC Senior Resident Inspector. Notified R3DO (Lipa).

ENS 4429212 June 2008 17:45:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessUnavailability of Emergency Operations FacilityAt 1345 on Thursday, June 12, 2008, the Cook Nuclear Plant (CNP) Buchanan Office Building was conservatively evacuated due to the presence of a solvent vapor in the building. The Buchanan Office Building houses both the Emergency Operations Facility (EOF) and Joint Information Center (JIC). The Buchanan Office Building has been ventilated and has been verified inhabitable by Safety and Health personnel. The Emergency Operations Facility and Joint Information Center access was restored at 1530 on Thursday, June 12, 2008. Further investigation concluded that the concentration of the solvent vapor was never at a level that would have mandated evacuation. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss of offsite response capability. The licensee notified the NRC Resident Inspector.
ENS 4417126 April 2008 02:10:0010 CFR 50.72(b)(3)(ii)(A), Seriously DegradedNon-Isolable Rcs Boundary Leakage from Instrument LineOn April 25, 2008, DC Cook Unit 1 was in Mode 4 heating up the RCS after a refueling outage. Personnel were performing a containment walkdown, with the RCS at 1000 psig, looking for leakage. Wisps of steam were seen coming from a 3/4 inch RCS flow instrument line weld, between the RCS loop piping and the instrument isolation valve. The leakage is less than 0.1 gpm. The leakage can not be isolated from the RCS and has been declared to be RCS Pressure Boundary Leakage. Entry into the RCS Operational Leakage Technical Specification, 3.4.13, was made at 2210 on April 25, 2008. This Technical Specification requires being in Mode 5 within 36 hours. The plant is cooling down and depressurizing as required by Technical Specifications. The plant is currently evaluating the appropriate repair method for this condition. The licensee notified the NRC Resident Inspector.05000315/LER-2008-004
ENS 4414718 April 2008 10:02:0010 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
10 CFR 50.72(a)(1)(i), Emergency Class Declaration
Unusual Event Declared Due to Seismic Activity

At 06:02 on April 18 2008, DC Cook Units 1 and 2 entered the Emergency Plan for a confirmed seismic event based on ground motion felt by plant personnel. An immediate notification to the NRC is required under 10 CFR 50.72(a)(3) for entry into the Emergency Plan. The ground motion sensed by plant personnel was confirmed with the National Earthquake Center. A magnitude 5.4 preliminary (Richter scale) earthquake was confirmed in Southern Illinois at LATITUDE 38.481 North/LONGITUDE 87.826 West. The Earthquake Abnormal Operating Procedures were entered for both Units. Ground motion was not felt by the control room operating crews, but was noted and reported by other plant personnel. Plant Process Computer trends of Unit 1 RWST level, South Boric Acid Storage Tank Level and North Chemical and Volume Control System Hold Up Tank Level indicated ground motion. No damage to plant equipment was noted during the initial evaluation of plant status. Investigation of the plant impact of the sensed ground motion is in progress. The NRC Resident Inspectors were notified by phone call. Current Plant status: Unit 1 is shutdown in Mode 6 with Residual Heat Removal Cooling. Unit 2 is operating in Mode 1 at 100% power. AEP system Operations was contacted and the GRID was described as stable and no electrical operations relating to the earthquake event. The Seismic Monitoring system was INOPERABLE as required by TRO 8.3.2, Cond. B, during the event for routine surveillance. This surveillance has been in progress since 03/26/08. No alarms were generated by the seismic monitoring system during this event.

  • * * UPDATE AT 0910 EDT ON 04/18/08 FROM CHRIS KELLEY TO S. SANDIN * * *

At 0905 EDT on 04/18/08, the licensee terminated the Unusual Event based on completion of system walk downs which confirmed no damage to the facility. The licensee informed the NRC Resident Inspector. Notified R3DO (Kozak), NRR (MJ Ross-Lee), IRD (McDermott), FEMA (Liggett) and DHS (Barnes).

  • * * UPDATE AT 0958 EDT ON 04/18/08 FROM BRAD LEWIS TO S. SANDIN * * *

A press release regarding the declaration of the emergency was issued and a subsequent press release is planned to address the termination. The offsite notifications are being reported under 10 CFR 50.72(b)(2)(xi)." The licensee informed the NRC Resident Inspector. Notified R3DO (Kozak).

  • * * UPDATE AT 1203 EDT ON 4/18/08 FROM TIMMOTHY WICE TO JASON KOZAL * * *

At 11:45 on April 18, 2008, D.C. Cook Units 1 and 2 entered the Emergency Plan for a confirmed seismic event based on ground motion felt by plant personnel. An immediate notification to the NRC is required under 10 CFR 50.72(a)(3) for entry into the Emergency Plan. The ground motion sensed by plant personnel was confirmed with the National Earthquake Center. A magnitude 4.6 (preliminary on Richter scale) earthquake-aftershock was confined in Southern Illinois at LATITUDE 38.483 North/LONGITUDE 87.39 West at 10:14 CDT / 11:14 EDT. The Earthquake Abnormal Operating Procedures were entered for both Units. Ground motion was not felt by the control room Operating crews, but was noted and reported by other plant personnel. No damage to plant equipment was noted during the initial evaluation of plant status. Investigation of the plant impact of the sensed ground motion is in progress. The NRC Resident Inspectors were notified in person. Current Plant status: Unit 1 is shutdown in Mode 6 with Residual Heat Removal Cooling. Unit 2 is operating in Mode 1 at 100% power. AEP System Operations was contacted and the GRID was described as stable with no electrical operations relating to the earthquake event. The Seismic Monitoring system was INOPERABLE as required by TRO 8.3.2, Condition B during the event for routine Surveillance. This Surveillance has been in progress since 03/26/08. No alarms were generated by the seismic monitoring system during this event. One of four channels is currently out of service. The three remaining seismic monitor channels indicated no ground acceleration above the lowest instrument activation level of 0.02g. D.C. Cook intends to issue a press release regarding the declaration of the Notification of Unusual Event emergency classification. The offsite notifications are being reported under 10 CFR 50.72(b)(2)(xi).

  • * * UPDATE AT 1616 EDT ON 4/18/08 FROM FRANK BAKER TO JASON KOZAL * * *

At 16:00 on April 18, 2008, DC Cook terminated the Unusual Event specified in EN 44147 for the aftershock response described above. A press release regarding the emergency event termination is anticipated. The offsite notifications are being reported under 10 CFR 50.72(b)(2)(xi). The licensee notified the NRC Resident Inspector. Notified R3DO (Kozak), NRR EO (Ross-Lee), IRD (McDermott), DHS (Gomez), FEMA (Burckhardt).

Residual Heat Removal
ENS 4414114 April 2008 16:00:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessLoss of Siren Alert Notification System Due to System ModificationsOn April 14, 2008 during activities being performed by a Berrien County (BC) vendor associated with relocation of the BC 911 Dispatch Center, a microwave line was wired in parallel with the transceiver used to activate the Alert and Notification System (ANS) sirens. Following completion of the installation of the parallel microwave circuit, station personnel were informed and a poll was conducted at approximately 1633 hours on April 14, 2008, to verify no loss of capability of the ANS. This poll was unsuccessful. Immediate corrective actions included removal of the parallel microwave circuit and performance of an additional siren poll. The subsequent siren poll was completed successfully at approximately 1739 hours on April 14, 2008. A silent testing performed at 1000 hours on April 15, 2008, confirmed that all sirens are operational. An investigation has been initiated to evaluate the exact nature of the intended change, and to examine the processes used to control activities that may impact ANS operation. The ANS may not have been available on April 14, 2008, from approximately 1200 hours when the parallel circuit was installed, until the configuration was restored and successfully polled at 1739 hours. The licensee has notified the NRC Resident Inspector. They are working with Berrien County during the investigation.
ENS 441227 April 2008 08:30:0010 CFR 50.72(b)(3)(xiii), Loss of Emergency PreparednessTechnical Support Center May Become Uninhabitable Due to Scheduled Maintenance

At 04:30 hours on Monday, April 7, 2008, the Cook Nuclear Plant (CNP) removed the Technical Support Center (TSC) Heating Ventilation Air Conditioning (HVAC) System from service for planned maintenance. The TSC HVAC system will remain out of service for a period of approximately three days. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary based upon results of procedurally required monitoring of TSC radiological conditions. This notification is being made in accordance with NUREG 1022 as a potential unavailability of an emergency response facility in accordance with 10 CFR 50.72 (b)(3)(xiii). The licensee notified the NRC Resident Inspector. The licensee will supplement this notification upon returning the TSC HVAC system to normal operational status.

  • * * UPDATE PROVIDED AT 1329 ON 04/07/08 BY RICHARD HACKMAN TO JEFF ROTTON * * *

The following information was provided by the licensee to RETRACT the event: Upon additional evaluation CNP determined that the planned maintenance reported above was limited in scope and did not remove the entire TSC HVAC system from service. The planned maintenance resulted in two of three fully redundant air chillers (air conditioners) being removed from service for maintenance. The third chiller and the TSC HVAC system is operable and remains in service. Therefore, the CNP TSC has been maintained in a configuration that ensures habitability. The NRC Resident Inspector has been notified of the retraction. Notified R3DO (Skokowski).

HVAC
ENS 4408119 March 2008 17:40:0010 CFR 26.73Fitness for Duty - Non-Licensed SupervisorA non licensed supervisor had a confirmed positive for illegal drugs during a pre-access fitness-for-duty test. The employee's access to the plant has been terminated. Contact the Headquarters Operations Officer for additional details. The licensee notified the NRC Resident Inspector.