Similar Documents at Cook |
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Category:NPDES NONCOMPLIANCE NOTIFICATION
MONTHYEARML17326A1191999-09-10010 September 1999 NPDES Noncompliance Notification:On 990909,unnatural Turbidity Was Observed at Cook Plant Outfall 001 & 002. Caused by Bentonite Clay Being Fed Into Discharge Vaults During Molluscicide Treatment.Terminated Clay Feed ML17326A0431999-07-0909 July 1999 NPDES Noncompliance Notification:On 990707,unnatural Turbidity Was Observed at Outfall 002.Caused by Bentonite Clay Being Fed Into Discharge Vaults During Molluscicide Treatment.Clay Feed Was Terminated on 990708 ML17326A0421999-07-0909 July 1999 NPDES Noncompliance Notification:On 990707,sample Taken Showed Residual Clam-Trol CT-2 Value of 0.17 Ppm.Caused by Interruption of Clay Feed to Unit 1 Discharge Vault.Valve Was Cleared & Clay Feed Was re-established ML17335A1441998-07-31031 July 1998 NPDES Noncompliance Notification:On 980623,ice-making Sys Discharge Line Developed Leak & Oversprayed Containment Spillings Approx 50 Gallons.Caused by Vibration & Wear Against Line.Discharge Line Supports Have Been Redesigned ML17334B8161998-07-0808 July 1998 NPDES Noncompliance Notification:On 980617,discovered Lube Oil Discharge.Caused by Leaking Tubes Due to Corrosion of Tubes.Leaking Tubes Repaired & Established Insp/Preventive Maint Program for Lube Oil Coolers ML17334B7571998-04-27027 April 1998 NPDES Noncompliance notification:980327,boiler Condensate Spill Occurred.Caused by Small Amount of Condensate on Metal Skirting Surrounding Containment Berm.Failed Condensate Valve Was Replaced ML17334A6861998-03-13013 March 1998 NPDES Noncompliance Notification:On 980209,boiler Condensate Spill Occurred.Caused by Failed Sight Glass on Rental Plant Heating Boiler.Replaced Site Glass & Installed Plexiglass Shield Around Site Glass to Protect Operators ML17334A5881997-12-0909 December 1997 NPDES Noncompliance Notification:On 971108 Plant Personnel Chlorination Sys Was Shut Down,Due to Valve Lineup Error Made During Startup of Continuous Chlorination After Shutdown.Corrected Lineup & Repositioned Valve ML17333A3881996-03-13013 March 1996 NPDES Noncompliance Notification:On 960310,continuous Ph Monitoring of Outfall 00D(turbine Room Sump)Interrupted. Caused by Electronic Failure of Monitoring Instrumentation. Grab Samples Performed & Monitor Recalibrated on 960311 ML17333A3871996-02-28028 February 1996 NPDES Noncompliance Notification:On 960226,continuous Ph Monitoring of Outfall 00D(Turbine Room Sump) Interrupted. Caused by Fouling of Ph Instrumentation Glass Electrode. Electrode Cleaned & Ph Monitor Returned to Svc ML17332A9791995-09-21021 September 1995 NPDES Noncompliance Notification:On 950916,unnatural Turbidity Observed at Plant Outfalls 001 & 002 During Molluscicide Treatment at Plant.Preventive Actions Not Possible Due to Detoxificaion Requirements in NPDES Permit ML17332A9551995-09-0808 September 1995 NPDES Noncompliance Notification:On 950829,hydraulic Oil Spill Occurred While Divers Using Hydraulic Brushes to Remove Zebra Mussels from Plant Screenhouse Intake Forebay Walls.Oil Absorbent Booms Deployed Into Forebay ML17332A9541995-09-0707 September 1995 NPDES Noncompliance Notification:On 950831,determined That Discharge from Outfall 00C (Heating Boiler Blowdown) Exceeded Concentration of Monethanolamine Submitted in NPDES Application Due to Valve Being Aligned in Open Position ML17332A8301995-06-0808 June 1995 NPDES Noncompliance Notification:On 950530,spill of Ethylene Glycol Occurred When Contracted Svc Technician Troubleshooting Portable Welding Machine.Ethylene Glycol Coolant Replaced W/Propylene Glycol Coolant ML17332A6991995-03-23023 March 1995 NPDES Noncompliance Notification:On 950205 to 16,33 Wild Ducks Entrained in Intake Cribs & Subsequently Collected on Intake Screens within Screenhouse.Suspect Ducks Entrained While Feeding on Zebra Mussels ML17332A6961995-03-20020 March 1995 NPDES Noncompliance Notification:On 950301,bypass Discharge from Turbine Room Sump Through Emergency Over Flow Piping Into Intake Forebay to Lake Michigan ML17331B3311994-03-30030 March 1994 NPDES Noncompliance Notification:On 940303,determined HVAC Sys Leaking Water Containing Approx 1,000 Mg/Liter Sodium Nitrite at Calculated Rate of 0.5 Gpm ML17331A8841993-06-0808 June 1993 NPDES Noncompliance Notification:On 930526 Chlorine Exceedance Incorrectly Stated Event Occurred on May 21 Instead of Actual Date of May 19.Licensee Apologizes for Inconvenience Error May Have Caused ML17331A1251993-03-24024 March 1993 NPDES Noncompliance Notification:On 930322,plant Personnel Discovered Small Oil Sheen at North Storm Water Outfall 001S.Oil Residue from Parking Lot Gradually Entered Lake Michigan.Oil Absorbent Booms in Place at Outfall ML17329A6821992-11-12012 November 1992 NPDES Noncompliance Notification:On 921109,review of Records Determined That First Quarter 1992 Samples for Stormwater Outfall 001S Not Collected.Quarterly Sampling Requirement Added to Computerized Tracking Sys ML17329A5521992-07-0202 July 1992 NPDES Noncompliance Notification:On 920630,minor Inadvertent Discharge of Treatment Chemical Clam-trol CT-1 May Have Occurred.Fire Protection Clam-trol Treatment Was Suspended Immediately & Will Not Be Resumed Until Alterations Made ML17329A5481992-06-29029 June 1992 NPDES Noncompliance Notification:On 920624,grab Sample of Outfall 002 Circulating Water Discharge Indicated TRC Concentration of 0.33 mg/1.Caused by Flow Balance Between Plant Sys.Unit 1 in Shutdown Condition ML17329A5401992-06-10010 June 1992 NPDES Noncompliance Notification:On 920606,grab Sample of Outfall 002 Circulating Water Discharge Indicated Total Residual Chlorine Above Timits.Caused by Manfunctioning Svc Water Flow Meter.Flow Meter Will Be Replaced ML20086T9911992-01-0303 January 1992 Noncompliance Notification:On 911219,approx 400 Diving Ducks Collected in Circulating Water Sys Screenwash Baskets.Caused by Abundant Food Supply Provided by Circulating Water Discharge.Flow Rates Reduced ML17329A3231991-12-10010 December 1991 NPDES Noncompliance Notification:On 911129,discovered That HX Associated W/Component Cooling Water Sys Leaking & Drop in Sys Surge Tank Level Occurred.Approx 5,300 Gallons of Water Leaked from Sys.Hx Isolated for Repairs ML17329A0961991-07-11011 July 1991 Final NPDES Notification Re Exceeding Heat Addition Effluent Limitation on 910701-05 on Outfall 001 & 002. Cause Under Investigation.Power Reduction Initiated on 910705 to Meet Limitations ML17328B0091991-04-0909 April 1991 NPDES Noncompliance Notification:On 910327,automatic Temp Recorder for Outfall 001 Failed & No Temp Measurements Recorded from 910328-31.Plant Procedures Will Be Revised to Describe Compensatory Sampling Measures in Event of Failure ML17334B3961991-02-26026 February 1991 NPDES Noncompliance Notification:On 910220 & 21,unmonitored Discharges Occurred from Turbine Room Sump.Caused by Inoperable Ph Meter.Turbine Sump Room Isolated & Job Order Written to Repair Meter ML17328A7641990-10-30030 October 1990 NPDES Noncompliance Notification:On 901025,five Unmonitored Discharges from Turbine Room Sump Occurred Releasing 250,000 Gallons of Water.Caused by Downstream Blockage of Flow to TRS Sample Line.In Interim,Ph Sampling Performed ML17325B3311989-11-0707 November 1989 Notifies That Total Recoverable Petroleum Hydrocarbons Sample Collected on 891006 Contained 0.9 mg/1 Trph.Util Believes Amount to Be Anomalous Value ML17326B5701989-03-0909 March 1989 NPDES Noncompliance Notification:Prefilter Backwash Limitations Exceeded for Feb 1989.Plan to Ensure Future Compliance W/Npdes Permit Requirements Will Be Submitted to Plainwell District Ofc ML17326B5541989-03-0606 March 1989 NPDES Noncompliance Notification:On 890224,leak Found in Main Turbine Lubricating Oil Coolers.Cause Not Stated. Leaking Cooler Isolated & Tube Plugged & Eddy Current Testing Performed to Determine Integrity of Remaining Tubes ML17326B4981988-11-18018 November 1988 NPDES Noncompliance Notification:On 881114,sample of Prefilter Backwash Effluent (Outfall 00F) Analyzed for Suspended Solids & Indicated 171 mg/1.Rough Lake Conditions Stirred Bottom Sediments Coming Into Plant Intake Water ML17326B4941988-11-0707 November 1988 NPDES Noncompliance Notification:On 881031,prefilter Backwash Discharge (Outfall 00F) Indicated Suspended Solids Concentration of 138 Mg/L ML17325A9811988-10-0505 October 1988 NPDES Noncompliance Notification:On 880919,water Makeup Prefilter Backwash Sample Exceeded Limitations.Caused by High Solids in Intake from Lake Michigan.Plant Personnel Reminded About Need to Evaluate & Rept Analyses Promptly ML17325A9291988-09-13013 September 1988 NPDES Noncompliance Notification:On 880910,Unit 1 Discharged Taken During Circulating Water Chlorination Showed Chlorine Concentration of 0.135 Mg/L.Caused by Temporary Reduced Water Flow Through Sys.Pump Chlorine Feed Reduced ML17325A8441988-06-15015 June 1988 NPDES Noncompliance Notification:On 880602,oil Spill of Approx 300 Gallons from Underground Storage Tank Occurred. Cleanup & Recovery Measures Underway.Repairs Will Be Made to Leak Area.Cleanup Will Be Completed by 880617 ML17325A4911987-11-23023 November 1987 NPDES Noncompliance Notification:On 871117,analysis of Grab Sample of Unit Discharge Taken During Circulating Water Chlorination Showed Total Residual Chlorine Concentration Above Limits.Caused by Vibration Causing Valve to Close ML17325A2961987-09-14014 September 1987 NPDES Noncompliance Notification:On 870901,spill from Turbine Room Sump,Outfall 00D Occurred.Approx 9,000 Gallons of Water Overflowed to Lake Michigan.Grab Sample Indicated Ph of 6.57 & No Trace of Oil & Grease.Caused by Repairs ML17325A2681987-08-11011 August 1987 NPDES Noncompliance Notification:On 870805,chlorination of Circulating Water Commenced Due to Biological Fouling.Total Residual Chlorine Levels Recorded on 870805,08 & 09 Listed ML17334B1161987-07-0606 July 1987 NPDES Noncompliance Notification:On 870630,monitoring Turbine Room Sump Process Ph Meter Found to Be Inoperative. Turbine Room Sump May Have Discharged to Absorption Pond During Previous 5 H W/O Continuous Monitoring ML17325A0831987-04-27027 April 1987 NPDES Noncompliance Notification:On 870410,oil Entered Yard Drain When Pressurized Tank Sprayed Out 10 Gallons Number 2 Fuel Oil During Attempt to Measure Level in east-middle Heating Boiler Fuel Oil Tank.Cleanup Began Immediately ML20213G9891986-11-14014 November 1986 NPDES Noncompliance Notification:On 861107,recording Instrument from Which Circulating Water Intake & Discharge Temps Obtained Failed.Caused by Faulty servo-motor.Recording Instrument Repaired & Returned to Svc ML20214P9961986-09-0909 September 1986 Corrected NPDES Noncompliance Notification:On 860903,turbine Room Sump Overflowed Into Circulating Water Sys Intake Forebay.Caused by Airlocked Suction Lines.Grab Sample Taken. Condition Rept Will Determine Corrective Action ML17324A9981986-07-14014 July 1986 NPDES Noncompliance Notification:On 860709,discovered That Grab Sample for Suspended Solids Not Obtained for Steam Generator Blowdown During 860629 Startup.Blowdown Sys Used for Weekly Sampling Frequency ML20211K5131986-06-19019 June 1986 NPDES Noncompliance Notification:On 860616,during Draining & Cleaning Steam Generators,Suspended Solids Sample from Startup Blowdown Flash Tank Revealed Concentration of 172 Ppm.Probably Caused by Boric Acid ML20205S8491986-06-0202 June 1986 NPDES Noncompliance Notification:On 860528,w/both Nuclear Units Out of Svc,Heating Boiler Started.Blowdown Sample Had Suspended Solids Concentration of 129.Caused by Chemical Shock ML17321A9411985-10-24024 October 1985 NPDES Noncompliance Notification:On 851023,sample Taken of Suspended Solids Concentration Elevated.Caused by Chemical Shock Due to Batch Addition of Chemical Treatment ML20198A8631985-10-24024 October 1985 NPDES Noncompliance Notification:On 851019,steam Generator Found to Have Suspended Solids Concentration of 2,442 Ppm. Caused by Recent Steam Generator Cleaning ML20138N6271985-10-24024 October 1985 NPDES Noncompliance Notification:On 850716,plant Heating Boiler Started While Both NSSS Out of Svc.Blowdown Sample Taken on 851022,contained Suspended Solids Concentration of 169 Ppm.On 851023,sample Contained 195 Ppm 1999-09-10
[Table view] Category:TEXT-ENVIRONMENTAL REPORTS
MONTHYEARML17326A1191999-09-10010 September 1999 NPDES Noncompliance Notification:On 990909,unnatural Turbidity Was Observed at Cook Plant Outfall 001 & 002. Caused by Bentonite Clay Being Fed Into Discharge Vaults During Molluscicide Treatment.Terminated Clay Feed ML17326A0421999-07-0909 July 1999 NPDES Noncompliance Notification:On 990707,sample Taken Showed Residual Clam-Trol CT-2 Value of 0.17 Ppm.Caused by Interruption of Clay Feed to Unit 1 Discharge Vault.Valve Was Cleared & Clay Feed Was re-established ML17326A0431999-07-0909 July 1999 NPDES Noncompliance Notification:On 990707,unnatural Turbidity Was Observed at Outfall 002.Caused by Bentonite Clay Being Fed Into Discharge Vaults During Molluscicide Treatment.Clay Feed Was Terminated on 990708 ML17325B6131998-12-31031 December 1998 Annual Radioactive Effluent Release Rept for 980101-1231 for DC Cook Nuclear Plant,Units 1 & 2. ML17335A5241998-12-31031 December 1998 Annual Environ Operating Rept for Jan-Dec 1998 for DC Cook Nuclear Plant,Units 1 & 2. with 990430 Ltr ML17326A1241998-12-31031 December 1998 Revised Page 2 to 1998 Annual Environ Operation Rept, for DC Cook Nuclear Plant,Correcting Omission in App I ML17335A1441998-07-31031 July 1998 NPDES Noncompliance Notification:On 980623,ice-making Sys Discharge Line Developed Leak & Oversprayed Containment Spillings Approx 50 Gallons.Caused by Vibration & Wear Against Line.Discharge Line Supports Have Been Redesigned ML17334B8161998-07-0808 July 1998 NPDES Noncompliance Notification:On 980617,discovered Lube Oil Discharge.Caused by Leaking Tubes Due to Corrosion of Tubes.Leaking Tubes Repaired & Established Insp/Preventive Maint Program for Lube Oil Coolers ML17334B7571998-04-27027 April 1998 NPDES Noncompliance notification:980327,boiler Condensate Spill Occurred.Caused by Small Amount of Condensate on Metal Skirting Surrounding Containment Berm.Failed Condensate Valve Was Replaced ML17334A6861998-03-13013 March 1998 NPDES Noncompliance Notification:On 980209,boiler Condensate Spill Occurred.Caused by Failed Sight Glass on Rental Plant Heating Boiler.Replaced Site Glass & Installed Plexiglass Shield Around Site Glass to Protect Operators ML17334A6941997-12-31031 December 1997 Annual Radioactive Effluent Release Rept for Jan-Dec 1997. ML17334B7671997-12-31031 December 1997 Annual Environ Operating Rept for 970101-1231 for DC Cook Nuclear Plant,Units 1 & 2. W/980427 Ltr ML17334A5881997-12-0909 December 1997 NPDES Noncompliance Notification:On 971108 Plant Personnel Chlorination Sys Was Shut Down,Due to Valve Lineup Error Made During Startup of Continuous Chlorination After Shutdown.Corrected Lineup & Repositioned Valve ML17334B6221996-12-31031 December 1996 Annual Environ Operating Rept for 960101-961231. W/970418 Ltr ML17334B6201996-12-31031 December 1996 Annual Radioactive Effluent Release Rept for Period of 960101-1231. W/970320 Ltr ML17333A8051996-12-31031 December 1996 Number of Personnel & Man-Rem by Work & Job Function. ML17333A3881996-03-13013 March 1996 NPDES Noncompliance Notification:On 960310,continuous Ph Monitoring of Outfall 00D(turbine Room Sump)Interrupted. Caused by Electronic Failure of Monitoring Instrumentation. Grab Samples Performed & Monitor Recalibrated on 960311 ML17333A3871996-02-28028 February 1996 NPDES Noncompliance Notification:On 960226,continuous Ph Monitoring of Outfall 00D(Turbine Room Sump) Interrupted. Caused by Fouling of Ph Instrumentation Glass Electrode. Electrode Cleaned & Ph Monitor Returned to Svc ML17333A4021995-12-31031 December 1995 Corrected Annual Radioactive Effluent Release Rept for DC Cook Nuclear Plant Units 1 & 2. ML17334B5871995-12-31031 December 1995 Annual Environ Operating Rept,Jan-Dec 1995. W/960424 Ltr ML17334B5801995-12-31031 December 1995 Annual Radioactive Effluent Release Rept Jan-Dec 1995. W/960322 Ltr ML17332A9791995-09-21021 September 1995 NPDES Noncompliance Notification:On 950916,unnatural Turbidity Observed at Plant Outfalls 001 & 002 During Molluscicide Treatment at Plant.Preventive Actions Not Possible Due to Detoxificaion Requirements in NPDES Permit ML17332A9551995-09-0808 September 1995 NPDES Noncompliance Notification:On 950829,hydraulic Oil Spill Occurred While Divers Using Hydraulic Brushes to Remove Zebra Mussels from Plant Screenhouse Intake Forebay Walls.Oil Absorbent Booms Deployed Into Forebay ML17332A9541995-09-0707 September 1995 NPDES Noncompliance Notification:On 950831,determined That Discharge from Outfall 00C (Heating Boiler Blowdown) Exceeded Concentration of Monethanolamine Submitted in NPDES Application Due to Valve Being Aligned in Open Position ML17332A8301995-06-0808 June 1995 NPDES Noncompliance Notification:On 950530,spill of Ethylene Glycol Occurred When Contracted Svc Technician Troubleshooting Portable Welding Machine.Ethylene Glycol Coolant Replaced W/Propylene Glycol Coolant ML17332A6991995-03-23023 March 1995 NPDES Noncompliance Notification:On 950205 to 16,33 Wild Ducks Entrained in Intake Cribs & Subsequently Collected on Intake Screens within Screenhouse.Suspect Ducks Entrained While Feeding on Zebra Mussels ML17332A6961995-03-20020 March 1995 NPDES Noncompliance Notification:On 950301,bypass Discharge from Turbine Room Sump Through Emergency Over Flow Piping Into Intake Forebay to Lake Michigan ML17334B5381994-12-31031 December 1994 Annual Radioactive Effluent Release Rept Jan-Dec 1994. W/ 950320 Ltr ML17334B5411994-12-31031 December 1994 DC Cook Nuclear Plant Units 1 & 2 Annual Environ Operating Rept Jan-Dec 1994. W/950424 Ltr ML17331B3311994-03-30030 March 1994 NPDES Noncompliance Notification:On 940303,determined HVAC Sys Leaking Water Containing Approx 1,000 Mg/Liter Sodium Nitrite at Calculated Rate of 0.5 Gpm ML17334B5031993-12-31031 December 1993 DC Cook Nuclear Plant Annual Radioactive Effluent Release Rept for Jan-Dec 1993. W/940325 Ltr ML17334B5041993-12-31031 December 1993 Annual Environ Operating Rept Jan-Dec 1993 DC Cook Nuclear Plant Units 1 & 2. W/940419 Ltr ML17331A8841993-06-0808 June 1993 NPDES Noncompliance Notification:On 930526 Chlorine Exceedance Incorrectly Stated Event Occurred on May 21 Instead of Actual Date of May 19.Licensee Apologizes for Inconvenience Error May Have Caused ML17331A1251993-03-24024 March 1993 NPDES Noncompliance Notification:On 930322,plant Personnel Discovered Small Oil Sheen at North Storm Water Outfall 001S.Oil Residue from Parking Lot Gradually Entered Lake Michigan.Oil Absorbent Booms in Place at Outfall ML17331A0721992-12-31031 December 1992 DC Cook Semiannual Radioactive Effluent Release Rept for Jul-Dec 1992. W/930226 Ltr ML17334B4721992-12-31031 December 1992 DC Cook Nuclear Plant,Units 1 & 2 Annual Environ Operating Rept,920101-1231. W/930421 Ltr ML17329A6821992-11-12012 November 1992 NPDES Noncompliance Notification:On 921109,review of Records Determined That First Quarter 1992 Samples for Stormwater Outfall 001S Not Collected.Quarterly Sampling Requirement Added to Computerized Tracking Sys ML17329A5521992-07-0202 July 1992 NPDES Noncompliance Notification:On 920630,minor Inadvertent Discharge of Treatment Chemical Clam-trol CT-1 May Have Occurred.Fire Protection Clam-trol Treatment Was Suspended Immediately & Will Not Be Resumed Until Alterations Made ML17334B4381992-06-30030 June 1992 DC Cook Nuclear Plant,Units 1 & 2 Semiannual Radioactive Effluent Release Rept,Jan-June 1992. W/920826 Ltr ML17329A5481992-06-29029 June 1992 NPDES Noncompliance Notification:On 920624,grab Sample of Outfall 002 Circulating Water Discharge Indicated TRC Concentration of 0.33 mg/1.Caused by Flow Balance Between Plant Sys.Unit 1 in Shutdown Condition ML17329A5401992-06-10010 June 1992 NPDES Noncompliance Notification:On 920606,grab Sample of Outfall 002 Circulating Water Discharge Indicated Total Residual Chlorine Above Timits.Caused by Manfunctioning Svc Water Flow Meter.Flow Meter Will Be Replaced ML20086T9911992-01-0303 January 1992 Noncompliance Notification:On 911219,approx 400 Diving Ducks Collected in Circulating Water Sys Screenwash Baskets.Caused by Abundant Food Supply Provided by Circulating Water Discharge.Flow Rates Reduced ML17334B4501991-12-31031 December 1991 Hydrogeologic Evaluation of Cook Nuclear Plant,Bridgman, Mi. ML17334B4201991-12-31031 December 1991 DC Cook Nuclear Plant Units 1 & 2 Annual Environ Operating Rept,1991. W/920424 Ltr ML17329A4261991-12-31031 December 1991 Annual Personnel Monitoring Rept for 1991. W/920320 Ltr ML17329A3981991-12-31031 December 1991 Semiannual Radioactive Effluent Release Rept,Jul-Dec 1991. W/920226 Ltr ML17329A3231991-12-10010 December 1991 NPDES Noncompliance Notification:On 911129,discovered That HX Associated W/Component Cooling Water Sys Leaking & Drop in Sys Surge Tank Level Occurred.Approx 5,300 Gallons of Water Leaked from Sys.Hx Isolated for Repairs ML17334B4071991-09-30030 September 1991 Evaluation of Tritium Migration in Aquifer of DC Cook Nuclear Plant & Surrounding Communities. W/Two Oversize Drawings ML17329A0961991-07-11011 July 1991 Final NPDES Notification Re Exceeding Heat Addition Effluent Limitation on 910701-05 on Outfall 001 & 002. Cause Under Investigation.Power Reduction Initiated on 910705 to Meet Limitations ML20077S7241991-06-30030 June 1991 DC Cook Nuclear Plant Units 1 & 2 Semiannual Radioactive Effluent Release Rept,Jan-June 1991 1999-09-10
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. e inabana Methican
, Powet Company P 0. Box 16631
,a Columbut OH 43?16 Y
add DNDIANA MKH0GAN POWER AEP:NRC:1171 Donald C. Cook Nucicar Plant Units 1 and 2 Docket Nos. 50 315 and 50 316 License Nos. DPR 58 and DPR 74 UNUSUAL OR IMPORTANT ENVIRONMENTAL EVENT -
APPROXIMATELY 400 DIVING DUCKS COLLECTED IN Tile CIRCULATING VATER SYSTEM SCREENVASil BASKETS U. S. Nuclear Regulatory Comrnission Attn Document Control Desk Washington, D. C. 20555 Janusry 3, 1992 Centlemen:
'he purpose of this report is to inform you that as of vecember 19, 1991 approximately 400 divio6 ducks (lesser and greater seaups) were collected in the circulating water system screenwash baskats at Cook Nuclear Plant. This event constitutes an " Unusual or Important Environmental Event" per Cook Nuclear Plant Technical Specifications (T/Ss) Appendix B, Paragraphs 4.1 and 5.4.2. As such, a verbal notification was made to Nuclear Regulatory Commission (NRC)
Resident Inspector, David Passchi, and to the Michigan Department of Natural Resources (MDNR) on December 5, 1991. In addition, Cook Nuclear Plant T/Ss stipulate that a written report to the NRC is due within 30 days of occurrence. As such, we are rubmitting the attached report.
This document has been prepared following Corporate procedures that incorporate a reasonable set of controls to ensure its accuracy and completeness prior to signature of the undersigned.
Sincerely, V
E. E. Fitzpatrick Vice President tjw Attachment ll i Y's 1 you l ll1%'@$$hp
m . _ _ _ _ _.. _ _ _ _ _ _ .
1
,4 Document Control Desk 2 AEP:NRC:1171 cc: D. II, W1111atos, J r.
A. A. Blind Bridgman .
I A. B. Davis, Region III P. A. Barrett ;
B. F. llenderson l R. F. Kroeger B. Walters Ft. Wayne i NRC Realdent Inspector T. Colburn NRC J. G. Keppler J. R. Padget.t G. Charnoff D. llahn -
ANI Library INPO B. A. Svensson l
I 5
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L Attachment 1 to AEp:NRC:1171 Page 1 Retsort of Unusual or Iwoorrant Environrtental Event f Conditions Prior to Occurrence {
Unit 1 and 2 in Mode 1 (Power Operation) at 100% power.
Description of Event, On December 5, 1991, it was noted that approximately 90 to 100 dead i lesser and Breater seaups (diving ducks) had been collected in the screenhouse fisn baskets (EIIS/NN.SCN), It was found that a zebra ,
mussel population, which provided an abundant food supply for the ,
ducks, had been established on the circulating water intake structures l and surrounding rip rap. The ducks became caught up in the intake 1 water flow while diving to feed on the zebra mussels.
Cause of Event The - event was caused by the abundant food supply and warm water environment provided by the circulating water discharge. As ducks dove down to feed on the zebra mussels, they became caught up in the circulating water intake flow. The presence of zebra mussels in the :
digestive tract of the ducks was verified by dissection, It should be noted that this is the first occurrence of this type and is related to the fact that the past summer was the first season of major zebra mussel infestation.
n factor contributing to the event was the closure of the circulating ?
water intake shutoff valve (124'MO 30) for repair work. This reduced the circulating water intake pathway from three sixteen foot intake pipes to twa sixteen foot pipes, resulting in an increase in the ilow velocity from the other two intake pipes, ,
Analysis of Event This event is considered reportable pursuant to Technical Specifict. tion Appendix ' B, paragraphs 4.1 and 5.4.2 as an unusual or important environmental event which indicates or could result in a significant environmental impact related to plant operation.
In response to the event, one of the Nuclear Regulatory Commission's resident inspectors at Cook Nuclear Plant, David Passchl, was verbally notified on December 5, 1991, Other agencies notified include the Michigan Department of Natural Resources (MDNR), and the US Department '
of Fish and Wildlife (DW). Both the MDNR and the DW responded to the site to retrieve duck remains for research purposes. In addition, the DW evaluated the site for a possible observation station.
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o' ..
Attachment 1 to AEp:NRC: 1171 Page 2 In the summer months, the combined numbers of lesser and greater seaups form a population larger than any other species of duck in North America, with the exception of the mallard. Trank C. Bellrose states in his book Ducks. Geese and Swans of North America that the average population of the scaups is about 7.415,000. The total number of ducks recovered from the screenhouse fish baskets was 400, representing 0.00545% of the total seaup population. Consequently, the effect of this event on the scaup population has been negligible.
Corrective Action Several interim actions have been taken to discourage ducks from populating the area. These measures include chasing the ducks with a boat, firing blank shells at the ducks, and locating rafts and predator eye balloons at the circulating water intake structures. In addition, to reduce flow rates at the intake structuro screens, circulating water pump #21 was removed from service on December 9,1991 and 12 WO 30 was returned to its full / open position on December 13, 1991.
Since these measures have been taken, a dramatic decrease has been noted '. n duck impingement. No ducks have been- found in the fish
. baskets since 12/15/91 As a more permanent solution to prevent recurrence, the intake structures will be thoroughly hydrolazed during the 1992 refueling outages to remove the zebra mussels. This should prevent the ducks from accumulating at the intake structures. The effectiveness of ~
hydrolazing the intake structures will be evaluated to determine whether it is necessary to take additional measures to prevent recurrence of this problem.
Failed Component Identification None.
Previous Similar Events None.
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