Semantic search
| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 50238 | 30 June 2014 11:30:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Planned Maintenance on Technical Support Center Ventilation | At 0730 EDT on Monday, June 30, 2014, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) charcoal filtration system was removed from service for scheduled maintenance. Under certain accident conditions, the TSC may become unavailable due to the inability of the charcoal filtration system 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 1500 EDT on Monday, June 30. The licensee has notified the NRC Resident Inspector.
The charcoal filtration system was restored to service at 1245 EDT on 6/30/2014. The licensee will notify the NRC Resident Inspector. Notified the R3DO (McCraw). | ||
| ENS 50223 | 24 June 2014 15:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability of Tsc Ventilation System Due to Scheduled Maintenance | At 1100 EDT on Tuesday, June 24, 2014 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 16:00 EDT on Tuesday, June 24. 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.
At 1615 EDT, TSC ventilation systems were restored to service. The licensee will be notifying the NRC Resident Inspector. Notified R3DO (Lara) | ||
| ENS 49803 | 7 February 2014 08:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailabiliity of Tsc Ventilation System Due to Scheduled Maintenance | At 03:00 EST on Friday, February 7, 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 16:00 EST on Friday, February 7. 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.
TSC ventilation system was returned to service following successful maintenance and post maintenance testing at 14:30 EST on Friday, February 7, 2014. The licensee has notified the NRC Resident Inspector." Notified R3DO (Orlikowski) | ||
| ENS 49687 | 1 January 2014 16:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Tsc Ventilation System Non-Functional | At 11:00 EST on Wednesday, January 1, 2014, during a scheduled functional test of the Cook Nuclear Plant (CNP) Technical Support Center (TSC) ventilation system, the following two dampers failed to properly open when the system was placed in emergency mode (ventilation flow directed through the emergency filtration unit): 12-HV-TSC-SD-5, TSC Ventilation Emergency Flow To & From Air Conditioner 12-HV-TSC-AC-1 Volume Damper 12-HV-TSC-SD-7, TSC Ventilation Emergency Filtration Unit 12-HV-TSC-FIL Inlet Volume Damper The TSC ventilation system is therefore non-functional. This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to an emergency response facility being non-functional. Repair activities are in progress for repair of the two dampers. 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. The licensee has notified the NRC Resident Inspector.
After repairs were completed, the TSC was restored to service at 0130 EST on 1/2/14. The licensee has notified the NRC Resident Inspector. | ||
| ENS 49682 | 31 December 2013 15:50:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability of Tsc Ventilation System Due to Scheduled Maintenance | At 1050 EST on Tuesday, December 31, 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 accidents 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 1600 EST on December 31, 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.
The TSC ventilation system maintenance and testing was completed satisfactorily and the system was restored to service at 1730 EST on 12/31/13. The licensee will notify the NRC Resident Inspector. Notified R3DO (Kunowski) | ||
| ENS 49563 | 21 November 2013 01:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Emergency Preparedness Capabilities Due to Unit 2 Plant Process Computer Replacement | The Unit 2 DC Cook Nuclear Plant (CNP) Plant Process Computer (PPC) will be removed from service on Wednesday, November 20, 2013 at 2000 (EST) to support planned replacement. The Unit 2 PPC, including the Emergency Response Data System (ERDS), will be unavailable to the NRC Operations Center. Planned replacement also affects the Safety Parameter Display System (SPDS), the Real Time Data Repository (RDR), and PPC data to emergency response facilities at CNP. Safety system annunciators and indications in the control room remain available. The scheduled replacement, returning of equipment to service and post maintenance testing is expected to be completed by 1400 on Sunday, December 22, 2013. 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 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).
The Unit 2 DC Cook Nuclear Plant (CNP) Plant Process Computer (PPC) has been restored to service as of Saturday, December 21, 2013 at 1046 EST. The Unit 2 PPC, including the Emergency Response Data System (ERDS), Safety Parameter Display System (SPDS), Real Time Data Repository (RDR), and PPC data to the Emergency Response Facilities at CNP have been restored to normal operation. No further compensatory actions required. The licensee has notified the NRC Resident Inspector. Notified R3DO (Riemer). | Emergency Response Data System Safety Parameter Display System | |
| ENS 49289 | 19 August 2013 13:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Emergency Preparedness Capabilities Due to Unit 1 Ppc Replacement | The Unit 1 DC Cook Nuclear Plant (CNP) Plant Process Computer (PPC) will be removed from service on Monday, August 19, 2013 at 0900 EDT to support planned replacement. The Unit 1 PPC, including the Emergency Response Data System (ERDS), will be unavailable to the NRC Operations Center. Planned replacement also affects the Safety Parameter Display System (SPDS), the Real Time Data Repository (RDR), and PPC data to Emergency Response Facilities at CNP. Safety system annunciators and indications in the control room remain available. The scheduled replacement, returning of equipment to service and post maintenance testing is expected to be completed by 2000 EDT on Saturday, September 7, 2013. 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 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).
The Unit 1 DC Cook Nuclear Plant (CNP) Plant Process Computer (PPC) was restored to service on Tuesday, October 1, 2013 at 1649 EDT following the planned replacement of the PPC. The Unit 1 PPC is fully functional, including the Emergency Response Data System (ERDS), which is available to the NRC Operations Center. This also restores the Safety Parameter Display System (SPDS), the Real Time Data Repository (RDR), and PPC data to Emergency Response Facilities at CNP. The licensee has notified the NRC Resident Inspector. R3DO (Duncan) notified. | Emergency Response Data System Safety Parameter Display System | |
| ENS 49191 | 15 July 2013 13:34:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unplanned Loss of Communications Due to Offsite Fiber Optic Cable Damage | At approximately 0934 EDT on Monday, July 15, 2013, the Cook Nuclear Plant (CNP) experienced a loss of capability to transmit Emergency Response Data System (ERDS) information to the Nuclear Regulatory Commission (NRC). Emergency Plan Implementing Procedures provide direction to manually record ERDS data for transmission to the NRC via telephone or fax. Concurrent with the loss of ERDS was a loss of the NRC 'Red Phone' (FTS-2000). The suspected cause of the loss was a damaged fiber optic cable located offsite in Bridgman, Michigan unrelated to CNP. This caused the failure of the internet service provider to CNP. Communications via alternate phone lines and corporate service number remain available and have been tested. CNP has contacted offsite service providers for restoration of service. The estimated time for return to service is 2000 EDT on Monday, July 15, 2013. This notification is being made in accordance with 10CFR50.72(b)(3)(xiii) due to the loss of communications capability which includes events that would significantly impair the ability of the licensee to implement the functions of its emergency plans if an emergency were to occur. The licensee has notified the NRC Resident Inspector.
At 2050 EDT on Monday, July 15, 2013, DC Cook Operations Department was notified by Information Technology (IT) that the offsite fiber optic cable that was damaged had been repaired. Affected equipment was verified to be working properly, specifically, Emergency Response Data System (ERDS) data is transmitting and the NRC 'Red Phone' is functional. Communication capability has been restored. The licensee has notified the Senior NRC Resident Inspector." Notified R3DO (Hills). | Emergency Response Data System | |
| ENS 49170 | 3 July 2013 05:15:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability of Technical Support Center Ventilation System Due to Scheduled Maintenance | At 0115 EDT on Wednesday, July 3, 2013, 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 2100 EDT on July 3, 2013. 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.
The TSC ventilation system maintenance and testing was completed satisfactorily and the system was restored to service at 1430 EDT on 7/3/13. The licensee has notified the NRC Resident Inspector. Notified R3DO (Kunowski) | ||
| ENS 48980 | 29 April 2013 13:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Tsc Ventilation System Out of Service for Scheduled Maintenance | At 0900 EDT on Monday, April 29, 2013, 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 1200 EDT on Thursday, May 2, 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.
Due to scheduling issues, the restoration of the Technical Support Center (TSC) air conditioning and charcoal filtration systems has been delayed. The TSC ventilation systems are expected to be returned to service by 0000 EDT on Friday, May 3, 2013. The licensee has notified the NRC Resident Inspector. Notified R3DO (Duncan).
The restoration of the Technical Support Center (TSC) air conditioning and charcoal filtration systems has been delayed but is in progress. The TSC ventilation systems are expected to be returned to service by 0600 EDT on Friday, May 3 2013. The licensee will notify the NRC Resident Inspector. Notified R3DO (Duncan).
The Technical Support Center (TSC) air conditioning and charcoal filtration systems were restored at 0818 EDT. The TSC is fully functional. The NRC Resident Inspector has been notified. Notified the R3DO (Duncan). | ||
| ENS 48922 | 14 April 2013 18:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability of Tsc Ventilation System Due to Scheduled Maintenance | At 1400 EDT on Sunday, April 14, 2013, 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 1400 EDT on Wednesday, April 17, 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.
The Technical Support Center (TSC) air conditioning and filtration systems have been returned to service following maintenance. The TSC is fully functional. The NRC Resident Inspector has been notified. Notified R3DO (Orth). | ||
| ENS 48645 | 3 January 2013 08:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 48504 | 13 November 2012 14:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Partial 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.
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).
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 48060 | 2 July 2012 06:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 47801 | 3 April 2012 12:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unit 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).
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 47794 | 1 April 2012 08:26:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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 47566 | 3 January 2012 09:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | 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.
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).
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 47317 | 4 October 2011 08:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 47040 | 11 July 2011 08:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 47025 | 6 July 2011 08:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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 46731 | 6 April 2011 08:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Technical 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.
The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1455 EDT. Notified R3DO (Daley). | ||
| ENS 46520 | 4 January 2011 13:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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,
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 46339 | 18 October 2010 14:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 46310 | 6 October 2010 11:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
TSC ventilation was returned to service at 1645 EDT. The licensee notified the NRC Resident Inspector. Notified the R3DO (Passehl). | ||
| ENS 46089 | 13 July 2010 12:10:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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 45831 | 12 April 2010 08:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Scheduled 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.
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 45698 | 15 February 2010 14:30:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 45653 | 25 January 2010 14:30:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Emergency 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).
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 45620 | 12 January 2010 09:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 45454 | 22 October 2009 04:01:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Technical 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.
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 45429 | 13 October 2009 11:44:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Technical 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.
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 45311 | 31 August 2009 11:21:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Tsc 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.
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 45185 | 6 July 2009 11:12:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 44992 | 15 April 2009 08:15:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 44765 | 13 January 2009 14:07:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Technical 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 44570 | 16 October 2008 15:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Partial 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 44542 | 6 October 2008 08:45:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 44390 | 7 August 2008 16:15:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability 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.
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 44324 | 27 June 2008 19:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Procedure Change Initiated to Support Tsc Habitability Dose Calculation | At 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 44311 | 23 June 2008 07:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss 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.
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).
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 44292 | 12 June 2008 17:45:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unavailability of Emergency Operations Facility | At 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 44141 | 14 April 2008 16:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Siren Alert Notification System Due to System Modifications | On 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 44122 | 7 April 2008 08:30:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Technical 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.
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 43935 | 25 January 2008 18:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Technical Support Center May Become Uninhabitable | At approximately 1300 hours Eastern Standard Time on Friday, January 25, 2008, the Cook Nuclear Plant (CNP) determined that under certain accident conditions, the Technical Support Center (TSC) may become uninhabitable due to the inability to switch to the emergency ventilation mode. 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. Parts are available and repairs are expected to be completed during the current shift. This event is reportable as specified in NUREG 1022 as a loss of an emergency response facility in accordance with 10 CFR 50.72 (b)(3)(xiii). The licensee notified the NRC Resident Inspector. |