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 Entered dateSiteRegionReactor typeEvent description
ENS 5429124 September 2019 15:02:00CookNRC Region 3On September 24, 2019, at 0930 EDT, a non-licensed employee contract supervisor had a confirmed positive test result for illegal drugs during a random test. The employee's access to the plant has been denied. The licensee has notified the NRC Resident Inspector."
ENS 5424126 August 2019 16:41:00CookNRC Region 3A non-licensed contract employee supervisor had a confirmed positive for an illegal drug during pre-access testing. The employee's access to the plant was denied.
ENS 5417621 July 2019 12:08:00CookNRC Region 3On July 19, 2019, DC Cook Unit 2 started experiencing degraded performance on the Unit 2 Non-Essential Service Water System (NESW) which affected one (1) NESW pump. On July 21, 2019, a second NESW pump on Unit 2 experienced degradation. On July 21, 2019, DC Cook Unit 2 elected to do a rapid downpower over approximately 40 minutes and perform a Manual Reactor Trip from 17 percent (rated thermal power) to repair the condition before any threshold was exceeded. The manual reactor trip was completed at 0826 EDT on July 21, 2019. This notification is being made in accordance with 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), Reactor Protection System (RPS), as an eight (8) hour report. The DC Cook NRC Resident Inspector has been notified. Unit 2 is being supplied by offsite power. All control rods fully inserted. Aux Feedwater pumps were started as required and are operating properly. Decay heat is being removed via the Steam Generator Power Operated Relief Valves following breaking Main Condenser Vacuum for expedited cooldown of the Main Turbine. Preliminary evaluation indicates all plant systems functioned normally following the reactor trip. DC Cook Unit 2 remains stable in Mode 3. No radioactive release is in progress as a result of this event. Unit 1 was not affected.
ENS 533877 May 2018 06:42:00CookNRC Region 3Westinghouse PWR 4-LoopOn May 7, 2018 at 0336 (EDT), DC Cook Unit 2 Reactor was manually tripped due to a high-high level experienced in the East Moisture Separator Drain Tank (MSDT) of the Moisture Separator Reheater (MSR). This notification is being made in accordance with 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 NRC Resident Inspector has been notified. Unit 2 is being supplied by offsite power. All control rods fully inserted. All Aux Feedwater Pumps started properly. Decay heat is being removed via the Steam Generator Power Operated Relief Valves following Main Steam Stop Valve closure at 0431 due to a slow RCS (Reactor Coolant System) cooldown. 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 release is in progress as a result of this event.
ENS 5334218 April 2018 09:29:00CookNRC Region 3Westinghouse PWR 4-LoopOn 4/18/2018, at approximately 0300 EDT, a contract cleaning employee notified her supervisor that she had found an oven mitt and a bottle containing a liquid that was possibly urine. The bottle had a temperature strip and heating element attached to it. These items were found in the trash in a bathroom in the training center located near the bathroom used for Fitness-for-Duty testing. The supervisor notified Security. Security responded and took possession of the objects. The licensee notified the NRC Resident Inspector.
ENS 5333413 April 2018 20:01:00CookNRC Region 3Westinghouse PWR 4-LoopAt 1555 EDT, the Unit 2 'CD' Emergency Diesel Generator (EDG) automatically started and loaded to 4kV Safeguards bus T21C. Testing was in-progress and the start was unplanned. Unit 2 is currently defueled. Unit 1 remains stable at 100 percent power. The South Spent Fuel Pit Cooling Train lost power due to a load shed. The South Spent Fuel Pit Cooling Pump was restarted on 2 'CD' EDG at 1614 EDT. The North Spent Fuel Pit Cooling Train remained in-service the entire time. There was no observable change in Spent Fuel Pool temperature. This event is reportable under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of an emergency diesel generator, as an eight (8) hour report. The NRC Resident Inspector has been notified.
ENS 5323027 February 2018 01:15:00CookNRC Region 3Westinghouse PWR 4-LoopAt 2247 Eastern (Standard) Time the Unit 1 Control Room was notified of a personnel injury in the Unit 1 lower containment. Unit 1 is currently in Mode 1 at 100 (percent) (Reactor) Power and the individual was working in lower containment. The individual's injury appears to be Heat Exhaustion. Site emergency medical technicians responded to the scene and the individual was transported to a local medical facility via ambulance. At the time of transport, the individual was considered to be potentially contaminated because complete surveys could not be performed while the individual was immobilized for transfer. The individual and clothing were surveyed at the hospital by a resident Radiation Protection Technician and no contamination was found. This report is being made pursuant to 10 CFR 50.72(b)(3)(xii), 'Any event requiring the transport of a radioactively contaminated person to an offsite medical facility for treatment.' The NRC Resident Inspector has been notified.
ENS 5296713 September 2017 01:08:00CookNRC Region 3Westinghouse PWR 4-Loop

At 0047 EDT, the licensee declared a notification of unusual event under emergency action level (EAL) S8 due to actuation of the letdown relief valve which resulted in reactor coolant system leakage to the pressurizer relief tank exceeding 10 gpm. The plant was in mode 3 at the time making preparations to proceed to cold shutdown to support their refueling outage. Operators were in the process of reducing reactor coolant system letdown from 120 gpm to 45 gpm when the letdown system relief valve lifted. The relief discharged to the pressurizer relief tank at approximately 12 gpm. Operators isolated the letdown line which reduced the leakage to approximately 1 gpm. Plant staff is in the process of determining where the 1 gpm leakage is from and evaluating the basis for terminating the unusual event. Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA National Watch Center (email) and Nuclear SSA (email).

  • * * UPDATE FROM BUD HINCKLEY TO HOWIE CROUCH AT 0807 EDT ON 9/13/17 * * *

At 0800 EDT, the licensee terminated the notification of unusual event. The basis for termination was that the letdown line was isolated which reduced leakage to less than the EAL threshold of 10 gpm. The cause of the letdown relief lifting is still under investigation. The licensee has notified the NRC Resident Inspector and will be notifying the state of Michigan and Berrien County. The licensee has issued a press release to the media concerning this event. Notified R3DO (Riemer), IRD MOC (Stapleton), NRR (Miller), DHS SWO, DHS NICC, FEMA Ops Center, FEMA National Watch Center (email) and Nuclear SSA (email).

  • * * RETRACTION FROM BUD HINCKLEY TO HOWIE CROUCH AT 1617 EDT ON 9/15/17 * * *

The condition reported in Event Notification #52967 pursuant to 10 CFR 50.72(a)(1)(i) has been evaluated, and determined not to have met the threshold for classification as an Unusual Event under Emergency Action Level (EAL) S-8 and is being retracted. During the events of 9/13/17, Control Room staff calculated Reactor Coolant System (RCS) leakage to the Pressurizer Relief Tank (PRT) through the Letdown Relief Valve to be greater than the EAL S-8 threshold of 10 gallons per minute. Subsequent review of trends associated with PRT level increase during the event determined that the RCS leakage to the PRT was less than 10 gallons per minute and therefore did not represent an Unusual Event under EAL S-8. The NRC Resident Inspector was notified of this retraction. Notified R3DO (Riemer).

ENS 5264930 March 2017 03:19:00CookNRC Region 3Westinghouse PWR 4-Loop

The Unit 1 DC Cook Nuclear Plant (CNP) Annunciator System failed on Thursday, March 30, 2017 at 0255 (EDT). The failure resulted in a complete loss of all alarm function of the Annunciator System in the Unit 1 Control Room. Unit 2 was unaffected by this failure. At 0310 (EDT), an Unusual Event (UE) was declared due to System Malfunction S-6, Loss of Alarms or Indication, due to an unplanned loss of safety system annunciators and/or indications in the Control Room for greater than 15 minutes. The Unit 1 PPC (Plant Process Computer) and ERDS (Emergency Response Data System) remain functional and available. This notification is being made in accordance with 10 CFR 50.72(a)(1)(i) due to the declaration of an Emergency Classification specified in the licensee's approved Emergency Plan. The licensee has notified the NRC Resident Inspector, the State and local agencies. Notified DHS SWO, FEMA Ops Center, DHS NICC. Notified FEMA National Watch and Nuclear SSA via E-mail.

  • * * UPDATE FROM MAX MILLER TO DONG PARK AT 0821 EDT ON 3/30/2017 * * *

Unit 1 DC Cook Nuclear Plant Annunciator System has been returned to functional. Unusual Event Classification was terminated at 0817 EDT on 3/30/17. The NRC Resident Inspector will be notified. Notified R3DO (Cameron), NRR EO (Miller), and IRD (Grant). Notified DHS SWO, FEMA Ops Center, DHS NICC. Notified FEMA National Watch and Nuclear SSA via E-mail.

ENS 525851 March 2017 15:18:00CookNRC Region 3Westinghouse PWR 4-LoopAt 1303 EDT on March 1, 2017, DC Cook notified the State of Michigan of a sulfuric acid tank leaking over 1,000 gallons of acid into the tank's berm. The leak was identified at approximately 1000 EDT coming from a drain line flange. The berm is designed to contain over 15,000 gallons which is sufficient to collect the known capacity of the tank. Cleanup of the sulfuric acid from the berm is ongoing, with no release to the environment or nearby drains. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) due to notification of offsite agencies. The NRC Resident Inspector was notified.
ENS 525448 February 2017 22:19:00CookNRC Region 3Westinghouse PWR 4-Loop

On February 3rd, 2017, during engineering modification reviews of electrical busses for a station switchyard transformer, electrical loads were identified on 4kV breakers that are not accounted for in the current safe shutdown analysis. Further reviews revealed the unanalyzed loads are associated with 26 cables that are routed through multiple fire zones in the Turbine Building and both Unit 1 and Unit 2 4kV rooms that have the potential to be affected from a fire event. Per NFPA 805 requirements, the cables need to be analyzed for overcurrent trip capability to demonstrate that the breakers will isolate a fault for a fire. Hourly Fire Watch tours have been established in the identified fire zones. The public health and safety is not impacted. This notification is being made in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. The NRC Resident Inspector was notified. This is a late notification for the 8 hour report.

  • * * RETRACTION PROVIDED BY ERIK LANKHEET TO JEFF ROTTON AT 1522 ON 04/04/2017 * * *

The condition reported in EN# 52544 pursuant to 10 CFR 50.72(b)(3)(ii)(B) has been evaluated, and determined not to be an unanalyzed condition that significantly degraded plant safety and is being retracted. Fire Protection Engineering performed circuit analysis of the discovered loads and determined that the Fire Safety Analysis credited power supply for an established recovery action was lost due to a Turbine Building fire. This was determined to not be a significant impact to plant safety due to the availability of an alternate offsite 4kV power supply that was not impacted by this fire. Emergency Operating Procedures already contain guidance that directs operators to align the 4kV busses to this offsite power circuit and that can be accomplished within the time necessary to perform the recovery action. During periods when this offsite power circuit was removed from service over the past three years, risk was managed using the online risk management process and no additional actions would have been required for its use as the credited power source in the Fire Safety Analysis. The NRC Resident Inspector was notified of this retraction. Notified the R3DO (Skokowski).

ENS 5245622 December 2016 05:45:00CookNRC Region 3Westinghouse PWR 4-Loop

With D.C. Cook Unit 1 in Mode 1 and 100 percent power and Unit 2 in Mode 4 during a refueling outage, the following emergency diesel generators (EDGs) were declared inoperable due to a discovered design and manufacturing issue involving some of the diesel fuel pumps/injectors in each of the following EDGs: Unit 1 CD (Train A) EDG, Unit 2 AB (Train B) EDG, and Unit 2 CD (Train A) EDG Due to both Unit 2 EDGs being inoperable, Unit 2 is required to be in Mode 5 by 1300 (EST) on 12/23/16. Unit 1 is required to restore its emergency diesel generator within 14 days (by 2300 (EST) on 1/04/17). In connection with both trains of Unit 2 EDGs being inoperable, this is being reported as an 8-hour report pursuant to 10CFR50.72(b)(3)(v)(D) as loss of safety function in connection with mitigating the consequences of an accident. The NRC Resident Inspector has been informed. Unit 1 maintenance will be prioritized over Unit 2 and Unit 2 will most likely proceed to Mode 5.

  • * * RETRACTION AT 1406 EDT ON 5/22/17 FROM RODNEY PICKARD TO JEFF HERRERA * * *

The condition reported in ENS 52456 pursuant to 10 CFR 50.72(b)(3)(v)(D) has been evaluated, and determined not to be a loss of safety function in connection with mitigating the consequences of an accident, and is being retracted. With D.C. Cook Unit 1 in Mode 1 and 100% power and Unit 2 in Mode 4 during a refueling outage, the following Emergency Diesel Generators (EDGs) were declared inoperable due to a discovered design and manufacturing issue involving some of the diesel fuel pumps/injectors in each of the following EDGs: Unit 1 CD (Train A) EDG, Unit 2 AB (Train B) EDG, and Unit 2 CD (Train A) EDG. Subsequent endurance testing was performed on selected Delivery Valve Holders (DVH), which were the affected components of the diesel fuel pumps/injectors, to evaluate the expected degradation of the DVHs during the EDG mission. This testing determined that the identified design and manufacturing issue would not have prevented the EDGs from performing their intended safety functions. Therefore, all EDGs were OPERABLE and did not result in a loss of safety function in connection with mitigating the consequences of an accident. The NRC Resident Inspector was notified of this retraction. Notified the R3DO (Kunowski).

ENS 520656 July 2016 01:02:00CookNRC Region 3Westinghouse PWR 4-LoopOn July 6, 2016, at 0038 (EDT), DC Cook Unit 2 Reactor was manually tripped and at 0050 (EDT) an Unusual Event (N-7 'Unanticipated Explosion') Emergency Declaration was made due to steam leak and associated damage to the turbine building. 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. The Unusual Event was terminated at 0207 (EDT). This notification is being made in accordance with 10 CFR 50.72 (a)(1)(i) due to declaration of an emergency class. Original notification to NRC made at 0100 EDT via ENS. This event is reportable under 10 CFR 50.72(b)(2)(iv)(B), Reactor Protection System (RPS) actuation and 10 CFR 50.72(b)(2)(xi) Offsite Notification, 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 NRC Resident Inspector has been notified. A press release is planned. Unit 2 is being supplied by offsite power. All control rods fully inserted. Decay heat is being removed via Steam Generator PORVs (Power Operated Relief Valve). 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 release is in progress as a result of this event. Notified DHS SWO, FEMA Ops Center, DHS NICC. Notified FEMA National Watch and Nuclear SSA via email.
ENS 518598 April 2016 20:50:00CookNRC Region 3Westinghouse PWR 4-LoopAt 1657 EDT on April 8, 2016, an oil leak developed from the station's switchyard transformer no. 4. Approximately 25,000 gallons of oil has leaked within the transformer's containment berm. At 1820 EDT on April 8, 2016, DC Cook environmental personnel determined that approximately 2000 gallons of oil had leaked outside of the containment berm onto the ground. None of the oil has made it to any nearby drains. Leak has stopped and cleanup is ongoing. D.C. Cook has notified the State of Michigan and local authorities. The NRC Resident Inspector was notified. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) due to notification of offsite agencies.
ENS 5110631 May 2015 16:32:00CookNRC Region 3Westinghouse PWR 4-Loop

At 1600 (EDT) on May 31, 2015, (DC Cook) operations commenced a shutdown of DC Cook Unit 1 to comply with LCO 3.8.1 Condition G, when the 14 day limit to complete Condition B Required Action could not be met. At 0010 (EDT) on May 18, 2015, Unit 1 AB Emergency Diesel Generator was removed from service for planned maintenance. LCO 3.8.1 Condition B was entered which allows 14 days to restore diesel to operable. At 1049 (EDT) on May 21, 2015, Unit 1 AB Emergency Diesel Generator tripped during post maintenance testing due to high bearing temperatures. Subsequent actions to repair and restore the diesel to operable status have been unsuccessful. This event is reportable under 10 CFR 50.72(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. Unit 1 is expected to be in Mode 5 by 2030 EDT on June 1, 2015. There is no impact on Unit 2.

  • * * UPDATE FROM CHRIS PEAK TO JOHN SHOEMAKER ON 6/1/15 AT 1704 EDT * * *

This update is to correct the information contained in the block titled 'Power/Mode After'. The power and mode after the event requiring notification (TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO INABILITY TO RESTORE UNIT 1 AB EDG WITHIN THE COMPLETION TIME PRESCRIBED IN LCO 3.8.1 CONDITION B) was 99% power and mode 1. The licensee has notified the NRC Resident Inspector. D.C. Cook Unit 1 is currently in Mode 3 and conducting a normal cooldown to Mode 4. Notified R3DO (Passehl).

  • * * UPDATE FROM CHRIS PEAK TO HOWIE CROUCH AT 0734 EDT ON 6/2/15 * * *

DC Cook Unit 1 reactor was shut down (Mode 3) at 0231 hours (EDT) June 01, 2015 and achieved Mode 5 at 0410 hours (EDT) June 02, 2015 to comply with LCO 3.8.1 Condition G with all systems operating normally. The licensee has notified the NRC Resident Inspector. Notified R3DO (Passehl).

ENS 5100423 April 2015 05:25:00CookNRC Region 3Westinghouse PWR 4-LoopOn April 23, 2015 DC Cook Unit 2 Reactor was manually tripped due to an uncontrolled cooldown due to two (2) failed open steam dump valves. The cause of the failure is still under investigation. This event is reportable under 10 CFR 50.72(b)(2)(i) Tech Spec Required Shutdown, as a four (4) hour report; 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 Reactor Protection System (RPS), as an eight (8) hour report. The electrical grid is stable and Unit 2 continues to be supplied by offsite power. All control rods fully inserted. Decay heat is being removed via steam generator Power Operated Relief Valves due to steam dump valves being manually isolated. 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 release is in progress as a result of this event. The DC Cook Resident NRC Inspector has been notified. There is no indication of primary to secondary leakage and there is no impact on Unit 1.
ENS 5082213 February 2015 15:55:00CookNRC Region 3Westinghouse PWR 4-LoopAt 1123 EST on 2/13/2015, an emergency medical report was received in both unit's Control Rooms that an individual was having a personal medical issue outside the protected area. Onsite Emergency Medical personnel were dispatched to the scene. Off-site medical assistance was immediately requested. CPR was administered and the individual was transferred by off-site medical ambulance service to a local hospital. The Operations Shift Manager received confirmation of a fatality at 1315 EST on 2/13/2015. Notification was made to the Michigan Occupational Safety and Health Administration (MIOSHA). Both Units remain at 100% power. This Event Notification is being made due to the fatality and notification to a government agency. The NRC Resident Inspector has been notified. The individual was at the workout facility when this incident occurred.
ENS 5069720 December 2014 13:39:00CookNRC Region 3Westinghouse PWR 4-Loop

At 1212 EST on December 12, 2014, D.C. Cook notified the State of Michigan and local authorities of an oil leak from the Unit 2 Main Turbine Lube Oil Cooler to Lake Michigan. Approximately 2000 gallons have leaked into Lake Michigan since October 25, 2014. No visible oil or oil sheen is present on Lake Michigan or the shore line. The leak is currently isolated as of 1030 EST on December 20, 2014. Leak repairs will be made to the cooler prior to placing back in service. The NRC Resident Inspector was notified. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) due to notification of offsite agencies. Notified DOE, EPA, USDA, HHS, and FEMA.

  • * * UPDATE FROM PERRY GRAHAM TO HOWIE CROUCH AT 1432 EST ON 12/22/14 * * *

The licensee issued a press release about this event this afternoon. Notified R3DO (Dickson).

ENS 505871 November 2014 05:03:00CookNRC Region 3Westinghouse PWR 4-Loop

On November 1, 2014, at 0249 (EDT), DC Cook Unit 1 reactor was manually tripped and at 0248 (EDT) DC Cook Unit 2 was manually tripped due lowering condenser vacuum caused by degraded forebay conditions (observed thick grass and sand). U-1 and U-2 entered Abnormal Operating Procedure for Degraded Forebay on November 1, 2014 at 0153 (EDT). Conditions degraded in U-1 and U-2 until all but 2 screens in each unit were tripped on overload and main condenser vacuum was lowering. U-1 and U-2 met criteria in the Degraded Forebay procedure to remove the units from service and remove all circulating water pumps from service. 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 electrical grid is stable. Unit 1 and Unit 2 are being supplied by offsite power. All control rods fully inserted in both units. Decay heat is being removed by steam generator PORVs. Preliminary evaluation indicates all plant systems functioned normally following the reactor trip with the exception of U-1 turbine driven auxiliary feed pump. DC Cook Unit 1 and Unit 2 remain stable in Mode 3 while conducting the post trip review. No radioactive release is in progress as a result of this event. Additional information received determined the Unit 1 turbine driven auxiliary feedwater pump tripped for unknown reasons. Feedwater flow to all steam generators was maintained by the U-1 east and west motor driven auxiliary feedwater pumps. U-2 reactor power was lowered from 100 percent to 50 percent over the hour prior to the trip in accordance with the Degraded Forebay Procedure. The DC Cook NRC Resident Inspector has been notified.

  • * * UPDATE PROVIDED BY RICHARD HARRIS TO JEFF ROTTON AT 0945 EDT ON 11/01/2014 * * *

At 0921 EDT, DC Cook issued a press release regarding the event described earlier. The licensee notified the NRC Resident Inspector. Notified R3DO (Lipa)

ENS 5049828 September 2014 10:55:00CookNRC Region 3Westinghouse PWR 4-LoopOn 9/28/14 at approximately 0830 EDT, the Operations Shift Manager was made aware that the Berrien County Sheriff's Department (BCSD) had been notified of an Emergency Siren that had actuated. BCSD was notified by local residents. BCSD reset the emergency siren and a local police officer verified the siren was no longer actuating. The cause of the actuation is under investigation at this time. The siren remains in service pending further investigation. There are a total of 70 sirens and all remain functional. This notification is being made under 10 CFR 50.72(b)(2)(xi), Offsite Notification, as a four (4) hour report. The licensee notified the NRC Resident Inspector.
ENS 5046216 September 2014 16:34:00CookNRC Region 3Westinghouse PWR 4-LoopAt approximately 1420 (EDT) on September 16, 2014, a worker collapsed in an office building inside the protected area. Initial response by on-site responders found the person unresponsive. Subsequent response by off-site medical responders determined the person had died. Licensee was notified of fatality at 1519 (EDT). The fatality was due to an apparent personal medical issue and not work related. The individual was not contaminated. The individual was transported off-site via Medic One, a local ambulance. The NRC Senior Resident Inspector was notified. Plant operation was not impacted by the event. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) due to notification of offsite agencies. The Licensee plans to make a press release. The licensee also notified Michigan OSHA, and other local authorities.
ENS 5038621 August 2014 04:03:00CookNRC Region 3Westinghouse PWR 4-Loop

At 0210 EDT on August 21, 2014, D.C. Cook made notifications to the State of Michigan, local authorities and the National Response Center due to a suspected release of approximately 8,700 gallons of diesel fuel oil to the environment. The level in the buried fuel oil storage tank for the Train B Emergency Diesel Generator was found to be approximately 8,700 gallons less than measurements taken within the last 24 hours. The tank is located within the plant protected area. At this time the suspected fuel oil plume has not left the site. The NRC Resident Inspector was notified. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) and NUREG 1022 section 3.2.12, due to notification of offsite agencies.

  • * * UPDATE FROM JAMES SHAW TO VINCE KLCO ON 8/22/14 AT 1342 EDT * * *

An event investigation determined that no spill occurred. The discrepancy in level was due to maintenance activities that caused an error in level indication. No actual loss of inventory from the fuel oil storage tank occurred. Offsite agencies have been notified that this spill event is being retracted (to the State and Offsite agencies). The NRC Resident Inspector was notified. Notified the R3DO (Passehl).

ENS 5032030 July 2014 08:16:00CookNRC Region 3Westinghouse PWR 4-LoopA non-licensed employee contractor foreman had a confirmed positive test result for alcohol during a random fitness-for-duty test. The employee's access to the plant has been terminated. This notification is being made under 10 CFR 26.719 (b)(2)(ii), significant FFD policy violations or programmatic failures, as a twenty-four (24) hour report. The licensee has notified the NRC Resident Inspector.
ENS 5023830 June 2014 07:50:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * * UPDATE FROM JAMES SHAW TO VINCE KLCO AT 1327 EDT ON 6/30/14 * * *

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 5022324 June 2014 10:37:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * *UPDATE PROVIDED BY KURT BERAN TO JEFF ROTTON AT 1617 EDT ON 06/24/2014 * * *

At 1615 EDT, TSC ventilation systems were restored to service. The licensee will be notifying the NRC Resident Inspector. Notified R3DO (Lara)

ENS 5018811 June 2014 01:23:00CookNRC Region 3Westinghouse PWR 4-LoopOn 6/10/14 at approximately 2327 EDT, the Operations Shift Manager was made aware that the Berrien County Sheriffs Department (BCSD) had been notified of an Emergency Siren that had actuated. BCSD was notified by local residents. BCSD reset the emergency siren and a local police officer verified the siren was no longer actuating. The cause of the actuation is under investigation at this time. The siren remains in service pending further investigation. There are a total of 70 sirens and all remain functional. This notification is being made under 10 CFR 50.72(b)(2)(xi), Offsite Notification, as a four (4) hour report. The licensee has notified the NRC Resident Inspector.
ENS 5014929 May 2014 14:10:00CookNRC Region 3Westinghouse PWR 4-Loop

At 0942 on May 25, 2014, the Cook Nuclear Plant (CNP) declared both Control Room Emergency Ventilation trains inoperable in accordance with LCO 3.7.10 due to an inoperable Control Room Envelope when a control room boundary door was identified as not latching correctly during a security door check. The latch would not have been able to maintain the door closed during an event resulting in Control Room Pressurization. At this time, Security established a continuous door post and would have been able to maintain the door closed. At 1602 on May 25, 2014, repairs to the control room boundary door latch were completed restoring the Control Room Envelope to Operable. The licensee has notified the NRC Senior Resident Inspector. This notification should have been made within 8 hours of the event in accordance with 10 CFR 50.72 (b)(3)(v)(D) per guidance in section 3.2.7 of NUREG-1022 - Event or Condition that Could Have Prevented Fulfilment of a Safety Function, but was not recognized at that time.

  • * * RETRACTION FROM PERRY GRAHAM TO JOHN SHOEMAKER AT 1443 EDT ON 6/20/14 * * *

The purpose of this report is to retract EN #50149 (May 25, 2014). On June 19, 2014, Cook Nuclear Plant concluded that the EN could be retracted based on the completion of a Maintenance Rule Evaluation (MRE) performed by Systems Engineering. By design, the Control Room Envelope (CRE) pressure boundary is required to be maintained at a positive pressure during all modes of operation and during any irradiated fuel movement. New information contained in the MRE concluded the CRE function was not lost as the control room boundary door remained closed without manual assistance during normal operations. The amount of make-up air during normal operation is similar to the design flow for accident mode (approx. 800 cfm). It was concluded that the sealing integrity was not lost, thus the CRE function was maintained. The CRE would have remained operable and LCO 3.7.10 would not have been entered for the identified condition. The licensee has notified the NRC Senior Resident Inspector. Notified the R3DO (Valos).

ENS 5002210 April 2014 14:33:00CookNRC Region 3Westinghouse PWR 4-Loop

A licensed employee violated the site Fitness-for-Duty (FFD) policy. The affected individual will be evaluated under for-cause FFD testing. The employee's plant access has been suspended. The NRC Resident Inspector has been informed.

  • * * UPDATE AT 0100 EDT ON 04/25/14 FROM BUD HINCKLEY TO S. SANDIN * * *

The licensee provided additional clarifying information. The NRC Resident Inspector will be informed. Notified R3DO (Cameron).

ENS 498037 February 2014 03:04:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * * UPDATE PROVIDED BY BRAD LEWIS TO JEFF ROTTON AT 1605 ON 02/07/2014 * * *

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 496871 January 2014 15:21:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * * UPDATE FROM DAN KURTH TO CHARLES TEAL AT 0220 EST ON 1/2/14 * * *
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 4968231 December 2013 10:50:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * * UPDATE ON 12/31/13 AT 1731 EST FROM BUD HINCKLEY TO DONG PARK * * *

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 4956320 November 2013 17:04:00CookNRC Region 3Westinghouse PWR 4-Loop

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).

  • * * UPDATE FROM DAN KURTH TO DONALD NORWOOD AT 1535 EST ON 12/21/2013 * * *

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).

ENS 4936420 September 2013 05:42:00CookNRC Region 3Westinghouse PWR 4-LoopOn 9/19/13 at approximately 2230 EDT, Emergency Siren 602 inadvertently actuated. Berrien County Dispatch was notified by local residents at 2237 EDT. The cause of the actuation is under investigation but believed to be due to rain water intrusion. The siren was subsequently disconnected by a station technician to prevent further erroneous actuation. The siren remains out of service and is the only siren out of service within the 10 mile Emergency Planning Zone (EPZ). There are a total of 70 sirens. This notification is being made under 10 CFR 50.72(b)(2)(xi), Offsite Notification, as a four (4) hour report. The Operations Shift Manager was notified of the actuation on 9/20/13 at 0340 EDT. The licensee has notified the NRC Resident Inspector.
ENS 4928919 August 2013 08:46:00CookNRC Region 3Westinghouse PWR 4-Loop

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).

  • * * UPDATE AT 1228 EDT ON 10/15/13 FROM BOWMAN TO HUFFMAN * * *

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.

ENS 4922028 July 2013 13:43:00CookNRC Region 3Westinghouse PWR 4-Loop

On July 28, 2013, at 1018 EDT, DC Cook Unit 2 Reactor was manually tripped due to lowering steam generator level caused by an automatic trip of the west main feed pump. The west main feed pump tripped on low suction pressure resulting from a secondary plant transient. The cause of the secondary transient 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 (8) hour report. The DC Cook Sr. Resident NRC Inspector has been notified. 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 dumps to the main condenser. 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 release is in progress as a result of this event. There was no affect on Unit 1.

  • * * UPDATE FROM DEAN BRUCK TO DONALD NORWOOD AT 1753 EDT ON 7/29/13 * * *

Additional information received determined the Turbine Driven Auxiliary Feedwater Pump discharge valve to Steam Generator #2 did not position, as required, following the reactor trip. The affected discharge valve opened as expected during pump start. The valve closed instead of throttling to the intermediate position upon subsequent high flow demand. Feedwater flow to Steam Generator #2 was maintained by the East Motor Driven Auxiliary Feedwater Pump. The NRC Resident Inspector has been notified of this update. Notified R3DO (Orth).

ENS 4919115 July 2013 16:10:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * * UPDATE ON 7/15/13 AT 2114 EDT FROM KELLY BAKER TO DONG PARK * * *

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).

ENS 491703 July 2013 01:15:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * * UPDATE FROM CHRIS PEAK TO JOHN SHOEMAKER ON 7/3/13 AT 1540 EDT * * *

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 4898029 April 2013 08:41:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * * UPDATE FROM GREG KANDA TO HOWIE CROUCH ON 5/2/13 AT 1448 EDT * * *

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).

  • * * UPDATE FROM DEAN BRUCK TO CHARLES TEAL ON 5/3/13 AT 0515 EDT * * *

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).

  • * * UPDATE FROM GREG KANDA TO VINCE KLCO AT 0822 EDT ON MAY 3, 2013 * * *

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 4896424 April 2013 17:15:00CookNRC Region 3Westinghouse PWR 4-LoopOn 4/24/13 at 1411 EDT, a fault occurred on the Unit 1 101 CD Reserve Auxiliary Transformer causing the 12 CD 34kV Reserve Feed Breaker to open resulting in a loss of Train A Reserve Feed to Unit 1 and Unit 2. The cause of the fault is still under investigation. Unit 2 remains stable in 100% power. Unit 2 entered LCO 3.8.1, AC Source - Operating, Condition A, one required offsite circuit inoperable Restore Unit 2 reserve feed to operable status within 72 hours. Unit 1 is currently in a refueling outage and offline. Unit 1 CD Emergency Diesel Generator (EDG) automatically started and loaded as expected. North Spent Fuel Pit Cooling Train lost power due to a load shed, which resulted in a 2 degree Fahrenheit rise in the Spent Fuel Pool Temperature. The North Spent Fuel Pit Cooling Pump was restarted on 1 CD EDG at 1447 EDT. South Spent Fuel Pool Cooling Train remained in-service the entire time. The licensee has notified the NRC Resident Inspector.
ENS 4894519 April 2013 12:30:00CookNRC Region 3Westinghouse PWR 4-LoopOn 4/18/13 at 2312 EDT, Emergency Siren 955 inadvertently actuated for approximately 5 minutes. The cause of the actuation is under investigation but believed to be due to rain water intrusion. The siren stopped on its own, and was subsequently disconnected by the siren vendor to prevent further erroneous actuation. The siren remains out service and is the only siren out of service within the 10 mile Emergency Planning Zone (EPZ). There are a total of 70 sirens. The siren is located in a state park not currently inhabited by campers; due to the siren location and time of activation the impact on the surrounding population was minimal. The event was therefore determined to not be reportable. A subsequent review of the event, considering communications made between Cook Nuclear Plant and the Berrien County 911 Dispatch Center, as well as recent industry operating experience of similar events, was performed; its conclusion was to conservatively make a report under 10 CFR 50.72(b)(2)(xi). The licensee has notified the NRC Resident Inspector.
ENS 4892214 April 2013 13:47:00CookNRC Region 3Westinghouse PWR 4-Loop

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.

  • * * UPDATE FROM GREGORY KANDA TO CHARLES TEAL AT 1456 EDT ON 4/17/13 * * *

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 4886831 March 2013 09:08:00CookNRC Region 3Westinghouse PWR 4-LoopOn 3/31/13 at 0414 EDT, dye penetrant testing identified a 10mm long relevant linear indication on a 3/4 inch RCS flow instrument line weld, between the RCS loop piping and the instrument isolation valve. This constitutes a weld defect in the primary coolant system that cannot be found acceptable per ASME Section XI. This section of piping is unisolable from the Reactor Coolant System. There is no evidence of active leakage currently or during the previous operating cycle, however, based on the dye penetrant testing this is considered a through wall leak. This event notification is being made in accordance with 10CFR50.72(b)(3)(ii)(A), as a condition that results in the condition of the nuclear power plant, including its principal safety barriers, being seriously degraded. Unit 1 is currently in a scheduled refueling outage in Mode 5 making preparations to transition to Mode 6. The plant is evaluating the appropriate repair method for this condition. The condition will be corrected during the current refueling outage. Unit 2 is in Mode 1 at 100% power and is unaffected by this condition. The NRC Resident Inspector has been notified.
ENS 4874712 February 2013 18:01:00CookNRC Region 3Westinghouse PWR 4-Loop

At 1530 EST on February 12, 2013, bones were discovered in the debris removal baskets in the Screen House at the Cook Nuclear Plant. These bones have the potential to be human remains. Local law enforcement agencies have been notified and the remains were removed by law enforcement personnel. The NRC Senior Resident Inspector was notified. Plant operations was not impacted by the event. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) due to notification of offsite agencies and potential for media involvement related to the discovery.

  • * * UPDATE FROM GREG KANDA TO CHARLES TEAL ON 2/15/13 AT 1045 EST * * *

After analysis by the Berrien County Sheriff's Department, it was determined that the bones discovered in the debris removal baskets in the screenhouse at the Cook Nuclear Plant on February 12, 2013 at 1530 EST were not of human origin, but most likely from a deer or other animal. The licensee has notified the NRC Resident Inspector. Notified the R3DO (Pelke).

ENS 487317 February 2013 18:37:00CookNRC Region 3Westinghouse PWR 4-LoopAt 1620 EST on 2/7/2013 an emergency medical report was received in Unit 1 Control Room that an individual was reported to have collapsed and was lying unconscious outside of the protected area. Fire protection and Emergency Medical personnel were dispatched to the scene. The individual was unresponsive, without a pulse and not breathing. Off-site medical assistance was immediately requested. CPR was commenced and continued until transfer of the individual to off-site medical ambulance service Medic 1. An Automatic External Defibrillator (AED) was used once, as allowed by the AED. Confirmation of the fatality was received at 1735 EST on 2/7/2013. The individual was pronounced dead at 1712 EST on 2/7/2013. Both Units remain at 100% power. This Event notification is being made due to the onsite fatality. The NRC Resident Inspector has been notified.
ENS 486453 January 2013 02:01:00CookNRC Region 3Westinghouse PWR 4-Loop

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 07:49:00CookNRC Region 3Westinghouse PWR 4-Loop

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).

ENS 4812019 July 2012 18:28:00CookNRC Region 3Westinghouse PWR 4-LoopAt 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.
ENS 480602 July 2012 01:49:00CookNRC Region 3Westinghouse PWR 4-Loop

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 02:34:00CookNRC Region 3Westinghouse PWR 4-LoopOn 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.
ENS 4786426 April 2012 01:21:00CookNRC Region 3Westinghouse PWR 4-LoopAt 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.