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| issue date = 07/31/1999
| issue date = 07/31/1999
| title = Monthly Operating Rept for July 1999 for DC Cook Nuclear Plant,Unit 1.With 990812 Ltr
| title = Monthly Operating Rept for July 1999 for DC Cook Nuclear Plant,Unit 1.With 990812 Ltr
| author name = BAKKEN A C, PRATT M M, RICHARDSON S A
| author name = Bakken A, Pratt M, Richardson S
| author affiliation = AMERICAN ELECTRIC POWER CO., INC.
| author affiliation = AMERICAN ELECTRIC POWER CO., INC.
| addressee name =  
| addressee name =  
Line 16: Line 16:


=Text=
=Text=
{{#Wiki_filter:CATEGORY1REL'ORYINFORMATION DISTRI~iSYSTEM(RIDS)ACCESSION NBR:9908240073 DOC.DATE:
{{#Wiki_filter:CATEGORY 1 RE  L'ORY    INFORMATION DISTRI         ~i SYSTEM (RIDS)
99/07/31NOTARIZED:
ACCESSION NBR:9908240073           DOC.DATE: 99/07/31 NOTARIZED: NO                      DOCKET  ¹ FACIL:50-315 .Donald C. Cook Nuclear Power Plant, Unit 1, Xndiana                      M 05000315 AUTH.jlAME           AUTHOR AFFILIATION PRATT,M.M.           American Electric Power Co., Inc.
NOFACIL:50-315
RICHARDSON,S.A. American Electric Power Co.', Inc.
.DonaldC.CookNuclearPowerPlant,Unit1,XndianaMAUTH.jlAME AUTHORAFFILIATION PRATT,M.M.
BAKKEN,A.C.           American Electric Power Co., Inc.
AmericanElectricPowerCo.,Inc.RICHARDSON,S.A.
RECIP . NAME          RECIPIENT AFFILIATION
AmericanElectricPowerCo.',Inc.BAKKEN,A.C.
AmericanElectricPowerCo.,Inc.RECIP.NAMERECIPIENT AFFILIATION DOCKET¹05000315


==SUBJECT:==
==SUBJECT:==
Monthlyoperating reptforJuly1999forDCCookNuclearPlant,Unit1.With990812ltr.DISTRIBUTION CODE:IE24DCOPIESRECEIVED:LTR ENCLSIZE:TITLE:MonthlyOperating Report(perTechSpecs)NOTES:RECIPIENT, IDCODE/NAME STANG,JCOPIESLTTRENCL11RECIPIENT IDCODE/NAME COPIESLTTRENCL0INTERNAL:
Monthly operating rept for July 1999            for  DC  Cook Nuclear Plant, Unit 1.With 990812        ltr.
ECENTER011RESDRAA/QRRXB 11EXTERNAL:
DISTRIBUTION CODE: IE24D          COPIES RECEIVED:LTR         ENCL        SIZE:
LMXTCOMARSHALL11NRCPDR11OC/DBA/PAD RGN3NOAC111111Y'C'M,lNOTETOALL"RIDS"RECIPIENTS:
TITLE: Monthly Operating Report (per Tech Specs)
PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATION REMOVEDFROMDISTRIBUTION LISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION, CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION 415-2083'ITOTALNUMBEROFCOPIESREQUIRED:
NOTES:
LTTR8ENCL8 AmericanElricP~erCookNudetOneCookPlaBridgman, MI491066164655901 August12,1999UnitedStatesNuclearRegulatory Commission DocumentControlDeskWashington, DC20555DocumentControlManager:Pursuanttotherequirements ofDonaldC.CookNuclearPlantUnit1Technical Specification 6.9.1.8,theattachedMonthlyOperating ReportforJuly1999issubmitted.
RECIPIENT,           COPIES              RECIPIENT            COPIES ID  CODE/NAME        LTTR ENCL          ID CODE/NAME         LTTR ENCL              0 STANG,J                  1      1 INTERNAL:       E CENTER    01              1      OC/DBA/PAD               1      1 RES DRAA/QRRXB            1      1      RGN3                      1      1            Y' EXTERNAL: LMXTCO MARSHALL            1      1      NOAC                      1      1 NRC PDR                  1      1 C
Sincerely, A.Christopher Bakken,IIISiteVicePresident ACB/bwoAttachment c:NRCRegionIIINRCProjectManager-NRRNRCResidentInspector ANINuclearEngineering Department INPORecordsCenterR.C.GodleyG.T.Gaffney-CantonD.R.Hahn-Department ofHealthS.Hamming-Department ofLaborG.JohnB.Lewis-McGraw-Hill Companies D.H.MalinT.P.NoonanD.W.Paul-Lancaster J.E.PollockR.P.PowersRegulatory Licensing ManagerM.W.RencheckW.H.SchalkD.G.Turner9908240073 99073kPDRiiADOCK050003%5RPDR N.R.C.OPERATING DATARDOCKETNO.DATECOMPLETED BYTELEPHONE 50-315August2,1999M.M.Pratt616-'465-5901 D.C.CookUnit1July-99325011521020MWe)1056)1000OPERATING STATUS1.UnitName2.Reporting Period3.LicensedThermalPower(MWt)4.NamePlateRating(GrossMWe)5.DesignElectrical Rating(NetMWe)6.MaximumDependable Capacity(GROSS7.MaximumDependable Capacity(NetMWeNotes:8.IfChangesOccurinCapacityRatings(Itemsno.3through7)SinceLastReportGiveReasons:9.PowerLeveltoWhichRestricted, IfAny(NetMWe):10.ReasonsForRestrictions, IfAny:11.HoursinReporting Period12.No.ofHrs.ReactorWasCritical13.ReactorReserveShutdownHours14.HoursGenerator onLine15.UnitReserveShutdownHours16.GrossThermalEnergyGen.(MWH)17.GrossElectrical EnergyGen.(MWH)18.NetElectrical EnergyGen.(MWH)19.UnitServiceFactor20.UnitAvailability Factor21.UnitCapacityFactor(MDCNet)22.UnitCapacityFactor(DERNet)23.UnitForcedOutageRateThisMonth744.00.00.00.00.00.00.00.00.00.00.00.0100.0Year-to-Date 5832.00.00.00.00.00.00.00.00.00.00.00.0100.0Cumulative 216216.0151285.3463.0148821.1321.0440194814.0 143013940.0 137597640.0 69.469.463.361.715.324.Shutdowns Scheduled overNextSixMonths(Type,Date,andDuration):
M,l NOTE TO ALL "RIDS" RECIPIENTS:
None25.IfShutDownAtEndofReportPeriod,Estimated DateofStartup:Setember200026.UnitsinTestStatus(PriortoCommercial Operation):
PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083                                               'I TOTAL NUMBER OF COPIES REQUIRED: LTTR                8  ENCL      8
INITIALCRITICALITY INITIALELECTRICITY COMMERCIAL OPERATION ForecastAchieved DOCKETNO.UNITNAMEDATECOMPLETED BYTELEPHONE 50-315D.C.CookUnit1August2,1999M.M.Pratt616-465-5901 AVERAGEDAILYPOWERLEVEL(MWe-Net)
 
July1999DAYAVERAGEDAILYPOWERLEVELDAYAVERAGEDAILYPOWERLEVEL7/1/997/2/997/3/997/4/997/5/997/6/997/7/997/8/997/9/997/10/997/11/997/12/997/13/997/14/997/15/997/16/997/17/997/18/997/19/997/20/997/21/997/22/997/23/997/24/997/25/997/26/997/27/997/28/997/29/997/30/997/31/99  
American El    ric P~er Cook Nude        t One Cook Pla Bridgman, MI49106 6164655901 August 12, 1999 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Document Control Manager:
~0~0~CIl DOCKETNO.UNITNAMEDATECOMPLETED BYTELEPHONE PAGE50-315D.C.CookUnit1August5,1999S.A.Richardson 616-465-5901 1of1MONTHLYOPERATING ACTIVITIES
Pursuant to the requirements of Donald C. Cook Nuclear Plant Unit 1 Technical Specification 6.9.1.8, the attached Monthly Operating Report for July 1999 is submitted.
-July1999HIGHLIGHTS Theunitenteredthisreporting periodinMode5at0%RTP.Theunitexitedthisreporting periodinMode5at0%RTP.Therewerenochallenges tothepressurizer safetyvalvesorpoweroperatedreliefvalves.Grosselectrical generation forthemonthofJulywas0MWh.DETAILS07/05/9907/27/99From0527to1326hours,placedTrainA4kVElectrical Safeguards Busesonthe69kVoffsiteemergency powersourcetosupportrepairactivityonthe12kVreservepowersourceinthestationswitchyard.
Sincerely, A. Christopher Bakken, III Site Vice President ACB/bwo Attachment c:       NRC Region III NRC Project Manager NRR NRC Resident Inspector ANI Nuclear Engineering Department INPO Records Center R. C. Godley G. T. Gaffney Canton D. R. Hahn Department of Health S.       Hamming Department of Labor G.       John B.       Lewis McGraw-Hill Companies D. H. Malin T. P. Noonan D. W. Paul Lancaster J. E. Pollock R. P. Powers Regulatory Licensing Manager M. W. Rencheck W. H. Schalk D. G. Turner 9908240073 99073k PDRii ADOCK 050003%5 R                            PDR
At1845hours,bothTrainAandTrainBEmergency DieselGenerators weredeclaredinoperable forModes5and6duetoinability tomeetdesignbasis.Thecombustion airintake,combustion exhaust,ventilation intakeandventilation exhauststructures weredeemedinadequate inregardtotornadogenerated missiles.
 
AlltimesareinEasternStandardTime(EST).  
N.R.C. OPERATING DATA R DOCKET NO.             50- 315 DATE                  August 2, 1999 COMPLETED BY            M. M. Pratt TELEPHONE              616-'465-5901 OPERATING STATUS                                                      Notes:
~01I4 DOCKETNO.UNITNAMEDATECOMPLETED BYTELEPHONE PAGE50-315D.C.CookUnit1August5,1999S.A.Richardson 616-465-'5901 1of1UNITSHUTDOWNS ANDPOWERREDUCTIONS
: 1. Unit Name                                  D. C. Cook Unit1
-July1999METHODOFSHUTTINGLICENSEEDURATIONDOWNEVENTSYSTEMCOMPONENT NO.DATETYPEHOURSREASONREACTORREPORTNO.CODECODECAUSEANDCORRECTIVE ACTIONTOPREVENTRECURRENCE 333090897F744.097-01097-01197-01297-01397-01497-016N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/ATheunitremainedshutdowntoresolvedesignbasisquestions discovered duringtheNRCArchitect andEngineering (AE)Inspection.
: 2. Reporting Period                                      July-99
1TYPE:F:ForcedS:Scheduled 2REASON:A:Equipment Failure(Explain) 8:Maintenance orTestC:Refueling D:Regulatory Restriction E:OperatorTrainingandLicenseExamination F:Administrative G:Operational Error(Explain)
: 3. Licensed Thermal Power (MWt)                           3250
H:Other(Explain) 3METHOD;1:Manual2:ManualScram3:Automatic Scram4:Other(Explain) 4SYSTEM:ExhibitG-Instructions forpreparation ofdataentrysheetsforLicenseeEventReport(LER)File(NUREG0161)5COMPONENT:
: 4. Name Plate Rating (Gross MWe)                         1152
ExhibitI:SameSource}}
: 5. Design Electrical Rating (Net MWe)                     1020
: 6. Maximum Dependable Capacity (GROSS MWe)                1056
: 7. Maximum Dependable Capacity (Net MWe)                  1000
: 8. If Changes Occur in Capacity Ratings (Items no. 3 through 7) Since Last Report Give Reasons:
: 9. Power Level to Which Restricted,   If Any (Net MWe):
: 10. Reasons For Restrictions, If Any:
This Month              Year-to-Date              Cumulative
: 11. Hours in Reporting Period                      744.0                    5832.0                      216216.0
: 12. No. of Hrs. Reactor Was Critical                0.0                      0.0                        151285.3
: 13. Reactor Reserve Shutdown Hours                  0.0                      0.0                          463.0
: 14. Hours Generator on Line                        0.0                      0.0                        148821.1
: 15. Unit Reserve Shutdown Hours                    0.0                      0.0                          321.0
: 16. Gross Thermal Energy Gen. (MWH)                0.0                      0.0                    440194814.0
: 17. Gross Electrical Energy Gen. (MWH)              0.0                      0.0                    143013940.0
: 18. Net Electrical Energy Gen. (MWH)                0.0                      0.0                    137597640.0
: 19. Unit Service Factor                            0.0                      0.0                            69.4
: 20. Unit Availability Factor                        0.0                      0.0                            69.4
: 21. Unit Capacity Factor (MDC Net)                  0.0                      0.0                            63.3
: 22. Unit Capacity Factor (DER Net)                  0.0                       0.0                           61.7
: 23. Unit Forced Outage Rate                        100.0                    100.0                            15.3
: 24. Shutdowns Scheduled over Next Six Months (Type, Date, and Duration):
None
: 25. If Shut Down At End of Report Period, Estimated Date of Startup:
Se tember 2000
: 26. Units in Test Status (Prior to Commercial Operation):
Forecast                Achieved INITIALCRITICALITY INITIALELECTRICITY COMMERCIAL OPERATION
 
DOCKET NO. 50- 315 UNIT NAME      D.C. Cook Unit1 DATE          August 2, 1999 COMPLETED BY  M. M. Pratt TELEPHONE      616-465-5901 AVERAGE DAILYPOWER LEVEL (MWe-Net)
July 1999 DAY    AVERAGE DAILY                        DAY    AVERAGE DAILY POWER LEVEL                                POWER LEVEL 7/1/99                                    7/17/99 7/2/99                                    7/18/99 7/3/99                                    7/19/99 7/4/99                                    7/20/99 7/5/99                                    7/21/99 7/6/99                                    7/22/99 7/7/99                                    7/23/99 7/8/99                                    7/24/99 7/9/99                                    7/25/99 7/1 0/99                                    7/26/99 7/1 1/99                                    7/27/99 7/12/99                                    7/28/99 7/1 3/99                                    7/29/99 7/14/99                                    7/30/99 7/1 5/99                                    7/31/99 7/16/99
 
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DOCKET NO.               50- 315 UNIT NAME                D.C. Cook Unit 1 DATE                    August 5, 1999 COMPLETED BY            S. A. Richardson TELEPHONE                616-465-5901 PAGE                    1 of1 MONTHLYOPERATING ACTIVITIES - July 1999 HIGHLIGHTS The unit entered this reporting period in Mode 5 at 0% RTP.
The unit exited this reporting period in Mode 5 at 0% RTP.
There were no challenges to the pressurizer safety valves or power operated relief valves.
Gross electrical generation for the month of July was 0 MWh.
DETAILS 07/05/99              From 0527 to 1326 hours, placed Train A 4kV Electrical Safeguards Buses on the 69 kV offsite emergency power source to support repair activity on the 12 kV reserve power source in the station switchyard.
07/27/99              At 1845 hours, both Train A and Train B Emergency Diesel Generators were declared inoperable for Modes 5 and 6 due to inability to meet design basis. The combustion air intake, combustion exhaust, ventilation intake and ventilation exhaust structures were deemed inadequate in regard to tornado generated missiles.
All times are in Eastern Standard Time (EST).
 
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DOCKET NO.           50- 315 UNIT NAME            D.C. Cook Unit1 DATE                  August 5, 1999 COMPLETED BY          S. A. Richardson TELEPHONE            616-465-'5901 PAGE                  1 of1 UNIT SHUTDOWNS AND POWER REDUCTIONS - July 1999 METHOD OF SHUTTING      LICENSEE DURATION                    DOWN          EVENT        SYSTEM    COMPONENT              CAUSE AND CORRECTIVE ACTION NO.     DATE  TYPE    HOURS          REASON      REACTOR      REPORT NO. CODE      CODE                        TO PREVENT RECURRENCE 333    090897  F      744.0                                    97-010      N/A        N/A          The unit remained shutdown to resolve design 97-011      N/A        N/A          basis questions discovered during the NRC 97-012      N/A        N/A          Architect and Engineering (AE) Inspection.
97-013      N/A        N/A 97-014      N/A        N/A 97-016      N/A        N/A 1 TYPE:            2 REASON:                             3 METHOD;                4 SYSTEM:                                 5 COMPONENT:
F: Forced          A: Equipment Failure (Explain)         1: Manual                Exhibit G - Instructions                  Exhibit I: Same Source S: Scheduled        8: Maintenance or Test                2: Manual Scram          for preparation of data C: Refueling                           3: Automatic Scram        entry sheets for Licensee D: Regulatory Restriction             4: Other (Explain)        Event Report (LER) File E: Operator Training and                                        (NUREG 0161)
License Examination F: Administrative G: Operational Error (Explain)
H: Other (Explain)}}

Latest revision as of 02:11, 4 February 2020

Monthly Operating Rept for July 1999 for DC Cook Nuclear Plant,Unit 1.With 990812 Ltr
ML17326A087
Person / Time
Site: Cook American Electric Power icon.png
Issue date: 07/31/1999
From: Bakken A, Pratt M, Richardson S
AMERICAN ELECTRIC POWER CO., INC.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9908240073
Download: ML17326A087 (8)
v • d • e


Text

CATEGORY 1 RE L'ORY INFORMATION DISTRI ~i SYSTEM (RIDS)

ACCESSION NBR:9908240073 DOC.DATE: 99/07/31 NOTARIZED: NO DOCKET ¹ FACIL:50-315 .Donald C. Cook Nuclear Power Plant, Unit 1, Xndiana M 05000315 AUTH.jlAME AUTHOR AFFILIATION PRATT,M.M. American Electric Power Co., Inc.

RICHARDSON,S.A. American Electric Power Co.', Inc.

BAKKEN,A.C. American Electric Power Co., Inc.

RECIP . NAME RECIPIENT AFFILIATION

SUBJECT:

Monthly operating rept for July 1999 for DC Cook Nuclear Plant, Unit 1.With 990812 ltr.

DISTRIBUTION CODE: IE24D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Monthly Operating Report (per Tech Specs)

NOTES:

RECIPIENT, COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL 0 STANG,J 1 1 INTERNAL: E CENTER 01 1 OC/DBA/PAD 1 1 RES DRAA/QRRXB 1 1 RGN3 1 1 Y' EXTERNAL: LMXTCO MARSHALL 1 1 NOAC 1 1 NRC PDR 1 1 C

M,l NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 'I TOTAL NUMBER OF COPIES REQUIRED: LTTR 8 ENCL 8

American El ric P~er Cook Nude t One Cook Pla Bridgman, MI49106 6164655901 August 12, 1999 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Document Control Manager:

Pursuant to the requirements of Donald C. Cook Nuclear Plant Unit 1 Technical Specification 6.9.1.8, the attached Monthly Operating Report for July 1999 is submitted.

Sincerely, A. Christopher Bakken, III Site Vice President ACB/bwo Attachment c: NRC Region III NRC Project Manager NRR NRC Resident Inspector ANI Nuclear Engineering Department INPO Records Center R. C. Godley G. T. Gaffney Canton D. R. Hahn Department of Health S. Hamming Department of Labor G. John B. Lewis McGraw-Hill Companies D. H. Malin T. P. Noonan D. W. Paul Lancaster J. E. Pollock R. P. Powers Regulatory Licensing Manager M. W. Rencheck W. H. Schalk D. G. Turner 9908240073 99073k PDRii ADOCK 050003%5 R PDR

N.R.C. OPERATING DATA R DOCKET NO. 50- 315 DATE August 2, 1999 COMPLETED BY M. M. Pratt TELEPHONE 616-'465-5901 OPERATING STATUS Notes:

1. Unit Name D. C. Cook Unit1
2. Reporting Period July-99
3. Licensed Thermal Power (MWt) 3250
4. Name Plate Rating (Gross MWe) 1152
5. Design Electrical Rating (Net MWe) 1020
6. Maximum Dependable Capacity (GROSS MWe) 1056
7. Maximum Dependable Capacity (Net MWe) 1000
8. If Changes Occur in Capacity Ratings (Items no. 3 through 7) Since Last Report Give Reasons:
9. Power Level to Which Restricted, If Any (Net MWe):
10. Reasons For Restrictions, If Any:

This Month Year-to-Date Cumulative

11. Hours in Reporting Period 744.0 5832.0 216216.0
12. No. of Hrs. Reactor Was Critical 0.0 0.0 151285.3
13. Reactor Reserve Shutdown Hours 0.0 0.0 463.0
14. Hours Generator on Line 0.0 0.0 148821.1
15. Unit Reserve Shutdown Hours 0.0 0.0 321.0
16. Gross Thermal Energy Gen. (MWH) 0.0 0.0 440194814.0
17. Gross Electrical Energy Gen. (MWH) 0.0 0.0 143013940.0
18. Net Electrical Energy Gen. (MWH) 0.0 0.0 137597640.0
19. Unit Service Factor 0.0 0.0 69.4
20. Unit Availability Factor 0.0 0.0 69.4
21. Unit Capacity Factor (MDC Net) 0.0 0.0 63.3
22. Unit Capacity Factor (DER Net) 0.0 0.0 61.7
23. Unit Forced Outage Rate 100.0 100.0 15.3
24. Shutdowns Scheduled over Next Six Months (Type, Date, and Duration):

None

25. If Shut Down At End of Report Period, Estimated Date of Startup:

Se tember 2000

26. Units in Test Status (Prior to Commercial Operation):

Forecast Achieved INITIALCRITICALITY INITIALELECTRICITY COMMERCIAL OPERATION

DOCKET NO. 50- 315 UNIT NAME D.C. Cook Unit1 DATE August 2, 1999 COMPLETED BY M. M. Pratt TELEPHONE 616-465-5901 AVERAGE DAILYPOWER LEVEL (MWe-Net)

July 1999 DAY AVERAGE DAILY DAY AVERAGE DAILY POWER LEVEL POWER LEVEL 7/1/99 7/17/99 7/2/99 7/18/99 7/3/99 7/19/99 7/4/99 7/20/99 7/5/99 7/21/99 7/6/99 7/22/99 7/7/99 7/23/99 7/8/99 7/24/99 7/9/99 7/25/99 7/1 0/99 7/26/99 7/1 1/99 7/27/99 7/12/99 7/28/99 7/1 3/99 7/29/99 7/14/99 7/30/99 7/1 5/99 7/31/99 7/16/99

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DOCKET NO. 50- 315 UNIT NAME D.C. Cook Unit 1 DATE August 5, 1999 COMPLETED BY S. A. Richardson TELEPHONE 616-465-5901 PAGE 1 of1 MONTHLYOPERATING ACTIVITIES - July 1999 HIGHLIGHTS The unit entered this reporting period in Mode 5 at 0% RTP.

The unit exited this reporting period in Mode 5 at 0% RTP.

There were no challenges to the pressurizer safety valves or power operated relief valves.

Gross electrical generation for the month of July was 0 MWh.

DETAILS 07/05/99 From 0527 to 1326 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.04543e-4 months <br />, placed Train A 4kV Electrical Safeguards Buses on the 69 kV offsite emergency power source to support repair activity on the 12 kV reserve power source in the station switchyard.

07/27/99 At 1845 hours0.0214 days <br />0.513 hours <br />0.00305 weeks <br />7.020225e-4 months <br />, both Train A and Train B Emergency Diesel Generators were declared inoperable for Modes 5 and 6 due to inability to meet design basis. The combustion air intake, combustion exhaust, ventilation intake and ventilation exhaust structures were deemed inadequate in regard to tornado generated missiles.

All times are in Eastern Standard Time (EST).

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DOCKET NO. 50- 315 UNIT NAME D.C. Cook Unit1 DATE August 5, 1999 COMPLETED BY S. A. Richardson TELEPHONE 616-465-'5901 PAGE 1 of1 UNIT SHUTDOWNS AND POWER REDUCTIONS - July 1999 METHOD OF SHUTTING LICENSEE DURATION DOWN EVENT SYSTEM COMPONENT CAUSE AND CORRECTIVE ACTION NO. DATE TYPE HOURS REASON REACTOR REPORT NO. CODE CODE TO PREVENT RECURRENCE 333 090897 F 744.0 97-010 N/A N/A The unit remained shutdown to resolve design 97-011 N/A N/A basis questions discovered during the NRC 97-012 N/A N/A Architect and Engineering (AE) Inspection.97-013 N/A N/A 97-014 N/A N/A 97-016 N/A N/A 1 TYPE: 2 REASON: 3 METHOD; 4 SYSTEM: 5 COMPONENT:

F: Forced A: Equipment Failure (Explain) 1: Manual Exhibit G - Instructions Exhibit I: Same Source S: Scheduled 8: Maintenance or Test 2: Manual Scram for preparation of data C: Refueling 3: Automatic Scram entry sheets for Licensee D: Regulatory Restriction 4: Other (Explain) Event Report (LER) File E: Operator Training and (NUREG 0161)

License Examination F: Administrative G: Operational Error (Explain)

H: Other (Explain)

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