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{{#Wiki_filter:NRCForm366U.S.NUCLEARREGULATORYCOMMISSION(6-1998)LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/charactersforeachblock)APPROVEDBYOMBNO.3160%104EXPIRES06/30)2001ESTIMATEDBORDENPERRESPONSETOCOMPLYWITHTHISMANDATORYINFORMATIONCOILECAONREOVEST'.500HRS.REPORTEDlESSONSlEARNEDAREINCORPORATEDNTOTHELICENSINGPROCESSANDFEDSACKTOINDVSTRY,FORWARDCOMMENTSREGARIXNGSVRDENESTNATETOTHEINFORMATIONANORECORDSMANAGEMENTBRANCH(T4F55).V.S.NVCLEARREGVLATORYCOMMISSlON.WASHINGTON,DC20555400),ANOTOTHEPAPERWORKREDVCTIONPROJECT(51504)05),OFFICEOFMANAGEMENTANOSICGET.WASHINGTON.OC20505FACIUTYNAME(1)CookNuclearPlantUnit1DOCKETNUMBER(2)05000-315PAGE(2)1of1TITLE(4)CalculationsShowthattheDividerBarrierBetweenUpperandLowerContainmentVolumesMayBeOverstressedEVENTDATE(5)LERNUMBER(6)REPORTDATE(7)OTHERFACILITIESINVOLVED(8)MONTH10DAYYEAR201998YEAR1999SEQUENTIALNUMBER007REVISIONNUMBER00MONTHDAY0401YEAR1999AIINAMCookUnit2ILINAMDNUMBR05000-316DNUMOPERATINGMODE(9)re)(11)20.2201(b)50.73(a)(2)(viii)20.2203(a)(2)(v)50.73(a)(2)(i)THISREPORTISSUBMITTEDPURSUANTTOTHEREQUIREMENTSOF10CFRli:(CheckoneormoPOWERLEVEL(10)0020.2203(a)(1)20.2203(a)(2)(i)20.2203(a)(2)(ii)20.2203(a)(2)(iii)20.2203(a)(2)(iv)20.2203(a)(3)(i)20.2203(a)(3)(ii)20.2203(a)(4)50.36(c)(1)50.36(c)(2)LICENSEECONTACTFORTHISLER(12)50.73(a)(2)(ii)50.73(a)(2)(iii)50.73(a)(2)(iv)50.73(a)(2)(v)50.73(a)(2)(vii)50.73(a)(2)(x)73.71OTHERSpeofySIAbetraorbe)rwrornNRCForm366AMr:DonaldC.Kosloff,ComplianceEngineerTELEPHONENUMBER(IndudeAreaCode)616/465-5901,X2129COMPLETEONELINEFOREACHCOMPONENTFAILUREDESCRIBEDINTHISREPORT(13)CAUSESYSTEMCOMPONENTMANUFACTURERREPORTABLEToEPIXCAUSESYSTEMCOMPONENTMANUFACTURERREPORTABLETOEPIXSUPPLEMENTALREPORTEXPECTED(14)XYES(IfYes,completeEXPECTEDSUBMISSIONDATE)NOEXPECTEDSUBMISSIONDATE(15)MONTH08DAY201999Abstract(Limitto1400spaces,i.e.,approximately15single-spacedtypewrittenlines)(16)WhileworkingonapreliminarycalculationfortheUnit1steamgeneratorreplacementproject,itwasconcludedthatsomeofthestructuralloadcasesindicatedoverstressedconditionsinthesteamgeneratorenclosures.Basedonthesepreliminaiyanalyses,onOctober20,1998,withbothunitsinMode5,engineeringpersonneldeterminedthatapostulatedsteamlinebreakcouldresultincalculatedstressesexceedingthecodeallowablestressesfortheUnit1steamgeneratorenclosures.Thesereinforcedconcreteenclosuresarepartofthedividerbarrierbetweentheupperandlowercontainmentvolumes.Overstressedconditionsintheseenclosurescouldallowincreasedsteambypassflowaroundtheicecondenserswhichcouldresultinhigherthanexpectedcontainmentpressure.Whenthepotentialoverstressconditionswereidentified,itwasconcludedthattheconditionscouldbeduetosignificantconservatismsinthepreliminarycalculationandinitsinterpretation.Engineeringcontinuedtheirevaluationofthisissue.However,asevaluationscontinued,alackofinformationconfirminganacceptableconditionledtotheconclusionthattherewasnolongerareasonableexpectationthatthestructureswouldnotbeoverstressed.OnMarch2,1999,withbothunitsstillinMode5,theapparentoverstressconditionsweredeterminedtobereportableunder10CFR50.72(b)(2)(i)and50.73(a)(2)(ii).Basedonthisdetermination,anENSnotificationwasmadeonMarch2,1999,at1314hoursinaccordancewith10CFR50.72(b)(2)(i).Structuralengineersarecurrentlydevelopingappropriateanalysesoftheloadsandstressesontheenclosures.Theresultsoftheseanalyseswilldetermineifanoverstressedconditioncouldhaveoccurredand,ifso,thesafetysignificanceoftheoverstressedcondition.Appropriatecorrectiveactionwillbedevelopedbasedonanevaluationoftheanalyticalresults.9904070426990401PDRADQCK05000315S,PDR}}
{{#Wiki_filter:NRCForm366U.S.NUCLEARREGULATORY COMMISSION (6-1998)LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/characters foreachblock)APPROVEDBYOMBNO.3160%104EXPIRES06/30)2001 ESTIMATED BORDENPERRESPONSETOCOMPLYWITHTHISMANDATORY INFORMATION COILECAON REOVEST'.
500HRS.REPORTEDlESSONSlEARNEDAREINCORPORATED NTOTHELICENSING PROCESSANDFEDSACKTOINDVSTRY, FORWARDCOMMENTSREGARIXNG SVRDENESTNATETOTHEINFORMATION ANORECORDSMANAGEMENT BRANCH(T4F55).V.S.NVCLEARREGVLATORY COMMISSlON.
WASHINGTON, DC20555400),
ANOTOTHEPAPERWORK REDVCTION PROJECT(51504)05),
OFFICEOFMANAGEMENT ANOSICGET.WASHINGTON.
OC20505FACIUTYNAME(1)CookNuclearPlantUnit1DOCKETNUMBER(2) 05000-315 PAGE(2)1of1TITLE(4)Calculations ShowthattheDividerBarrierBetweenUpperandLowerContainment VolumesMayBeOverstressed EVENTDATE(5)LERNUMBER(6)REPORTDATE(7)OTHERFACILITIES INVOLVED(8)MONTH10DAYYEAR201998YEAR1999SEQUENTIAL NUMBER007REVISIONNUMBER00MONTHDAY0401YEAR1999AIINAMCookUnit2ILINAMDNUMBR05000-316 DNUMOPERATING MODE(9)re)(11)20.2201(b)50.73(a)(2)(viii) 20.2203(a)(2)(v) 50.73(a)(2)(i)
THISREPORTISSUBMITTED PURSUANTTOTHEREQUIREMENTS OF10CFRli:(CheckoneormoPOWERLEVEL(10)0020.2203(a)(1) 20.2203(a)(2)(i) 20.2203(a)(2)(ii) 20.2203(a)(2)(iii) 20.2203(a)(2)(iv) 20.2203(a)(3)(i) 20.2203(a)(3)(ii) 20.2203(a)(4) 50.36(c)(1) 50.36(c)(2)
LICENSEECONTACTFORTHISLER(12)50.73(a)(2)(ii) 50.73(a)(2)(iii) 50.73(a)(2)(iv) 50.73(a)(2)(v) 50.73(a)(2)(vii) 50.73(a)(2)(x) 73.71OTHERSpeofySIAbetraorbe)rwrornNRCForm366AMr:DonaldC.Kosloff,Compliance EngineerTELEPHONE NUMBER(IndudeAreaCode)616/465-5901, X2129COMPLETEONELINEFOREACHCOMPONENT FAILUREDESCRIBED INTHISREPORT(13)CAUSESYSTEMCOMPONENT MANUFACTURER REPORTABLE ToEPIXCAUSESYSTEMCOMPONENT MANUFACTURER REPORTABLE TOEPIXSUPPLEMENTAL REPORTEXPECTED(14)XYES(IfYes,completeEXPECTEDSUBMISSION DATE)NOEXPECTEDSUBMISSION DATE(15)MONTH08DAY201999Abstract(Limitto1400spaces,i.e.,approximately 15single-spaced typewritten lines)(16)Whileworkingonapreliminary calculation fortheUnit1steamgenerator replacement project,itwasconcluded thatsomeofthestructural loadcasesindicated overstressed conditions inthesteamgenerator enclosures.
Basedonthesepreliminaiy
: analyses, onOctober20,1998,withbothunitsinMode5,engineering personnel determined thatapostulated steamlinebreakcouldresultincalculated stressesexceeding thecodeallowable stressesfortheUnit1steamgenerator enclosures.
Thesereinforced concreteenclosures arepartofthedividerbarrierbetweentheupperandlowercontainment volumes.Overstressed conditions intheseenclosures couldallowincreased steambypassflowaroundtheicecondensers whichcouldresultinhigherthanexpectedcontainment pressure.
Whenthepotential overstress conditions wereidentified, itwasconcluded thattheconditions couldbeduetosignificant conservatisms inthepreliminary calculation andinitsinterpretation.
Engineering continued theirevaluation ofthisissue.However,asevaluations continued, alackofinformation confirming anacceptable condition ledtotheconclusion thattherewasnolongerareasonable expectation thatthestructures wouldnotbeoverstressed.
OnMarch2,1999,withbothunitsstillinMode5,theapparentoverstress conditions weredetermined tobereportable under10CFR50.72(b)(2)(i) and50.73(a)(2)(ii).
Basedonthisdetermination, anENSnotification wasmadeonMarch2,1999,at1314hoursinaccordance with10CFR50.72(b)(2)(i).
Structural engineers arecurrently developing appropriate analysesoftheloadsandstressesontheenclosures.
Theresultsoftheseanalyseswilldetermine ifanoverstressed condition couldhaveoccurredand,ifso,thesafetysignificance oftheoverstressed condition.
Appropriate corrective actionwillbedeveloped basedonanevaluation oftheanalytical results.9904070426 990401PDRADQCK05000315S,PDR}}

Revision as of 09:15, 29 June 2018

LER 99-007-00:on 981020,calculations Showed That Divider Barrier Between Upper & Lower Containment Vols Were Overstressed.Engineers Are Currently Working on Analyses of Loads & Stress on Enclosures
ML17325B516
Person / Time
Site: Cook American Electric Power icon.png
Issue date: 04/01/1999
From: KOSLOFF D C
INDIANA MICHIGAN POWER CO.
To:
Shared Package
ML17325B513 List:
References
LER-99-007, LER-99-7, NUDOCS 9904070426
Download: ML17325B516 (1)
v • d • e


Text

NRCForm366U.S.NUCLEARREGULATORY COMMISSION (6-1998)LICENSEEEVENTREPORT(LER)(Seereverseforrequirednumberofdigits/characters foreachblock)APPROVEDBYOMBNO.3160%104EXPIRES06/30)2001 ESTIMATED BORDENPERRESPONSETOCOMPLYWITHTHISMANDATORY INFORMATION COILECAON REOVEST'.

500HRS.REPORTEDlESSONSlEARNEDAREINCORPORATED NTOTHELICENSING PROCESSANDFEDSACKTOINDVSTRY, FORWARDCOMMENTSREGARIXNG SVRDENESTNATETOTHEINFORMATION ANORECORDSMANAGEMENT BRANCH(T4F55).V.S.NVCLEARREGVLATORY COMMISSlON.

WASHINGTON, DC20555400),

ANOTOTHEPAPERWORK REDVCTION PROJECT(51504)05),

OFFICEOFMANAGEMENT ANOSICGET.WASHINGTON.

OC20505FACIUTYNAME(1)CookNuclearPlantUnit1DOCKETNUMBER(2) 05000-315 PAGE(2)1of1TITLE(4)Calculations ShowthattheDividerBarrierBetweenUpperandLowerContainment VolumesMayBeOverstressed EVENTDATE(5)LERNUMBER(6)REPORTDATE(7)OTHERFACILITIES INVOLVED(8)MONTH10DAYYEAR201998YEAR1999SEQUENTIAL NUMBER007REVISIONNUMBER00MONTHDAY0401YEAR1999AIINAMCookUnit2ILINAMDNUMBR05000-316 DNUMOPERATING MODE(9)re)(11)20.2201(b)50.73(a)(2)(viii) 20.2203(a)(2)(v) 50.73(a)(2)(i)

THISREPORTISSUBMITTED PURSUANTTOTHEREQUIREMENTS OF10CFRli:(CheckoneormoPOWERLEVEL(10)0020.2203(a)(1) 20.2203(a)(2)(i) 20.2203(a)(2)(ii) 20.2203(a)(2)(iii) 20.2203(a)(2)(iv) 20.2203(a)(3)(i) 20.2203(a)(3)(ii) 20.2203(a)(4) 50.36(c)(1) 50.36(c)(2)

LICENSEECONTACTFORTHISLER(12)50.73(a)(2)(ii) 50.73(a)(2)(iii) 50.73(a)(2)(iv) 50.73(a)(2)(v) 50.73(a)(2)(vii) 50.73(a)(2)(x) 73.71OTHERSpeofySIAbetraorbe)rwrornNRCForm366AMr:DonaldC.Kosloff,Compliance EngineerTELEPHONE NUMBER(IndudeAreaCode)616/465-5901, X2129COMPLETEONELINEFOREACHCOMPONENT FAILUREDESCRIBED INTHISREPORT(13)CAUSESYSTEMCOMPONENT MANUFACTURER REPORTABLE ToEPIXCAUSESYSTEMCOMPONENT MANUFACTURER REPORTABLE TOEPIXSUPPLEMENTAL REPORTEXPECTED(14)XYES(IfYes,completeEXPECTEDSUBMISSION DATE)NOEXPECTEDSUBMISSION DATE(15)MONTH08DAY201999Abstract(Limitto1400spaces,i.e.,approximately 15single-spaced typewritten lines)(16)Whileworkingonapreliminary calculation fortheUnit1steamgenerator replacement project,itwasconcluded thatsomeofthestructural loadcasesindicated overstressed conditions inthesteamgenerator enclosures.

Basedonthesepreliminaiy

analyses, onOctober20,1998,withbothunitsinMode5,engineering personnel determined thatapostulated steamlinebreakcouldresultincalculated stressesexceeding thecodeallowable stressesfortheUnit1steamgenerator enclosures.

Thesereinforced concreteenclosures arepartofthedividerbarrierbetweentheupperandlowercontainment volumes.Overstressed conditions intheseenclosures couldallowincreased steambypassflowaroundtheicecondensers whichcouldresultinhigherthanexpectedcontainment pressure.

Whenthepotential overstress conditions wereidentified, itwasconcluded thattheconditions couldbeduetosignificant conservatisms inthepreliminary calculation andinitsinterpretation.

Engineering continued theirevaluation ofthisissue.However,asevaluations continued, alackofinformation confirming anacceptable condition ledtotheconclusion thattherewasnolongerareasonable expectation thatthestructures wouldnotbeoverstressed.

OnMarch2,1999,withbothunitsstillinMode5,theapparentoverstress conditions weredetermined tobereportable under10CFR50.72(b)(2)(i) and50.73(a)(2)(ii).

Basedonthisdetermination, anENSnotification wasmadeonMarch2,1999,at1314hoursinaccordance with10CFR50.72(b)(2)(i).

Structural engineers arecurrently developing appropriate analysesoftheloadsandstressesontheenclosures.

Theresultsoftheseanalyseswilldetermine ifanoverstressed condition couldhaveoccurredand,ifso,thesafetysignificance oftheoverstressed condition.

Appropriate corrective actionwillbedeveloped basedonanevaluation oftheanalytical results.9904070426 990401PDRADQCK05000315S,PDR

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