ML17037C516: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(Created page by program invented by StriderTol)
Line 15: Line 15:


=Text=
=Text=
{{#Wiki_filter:AECDXSUTIONFORPART50DOCKETMATER(TEMPORARYFORM)CONTROLNO:FILE:8FROAA1:NiagaraMohawkPowerCorpSyracuse,N;Y.13202P.D.RaymondDATEOFDOC1-22-74DATEREC'D1-23-74LTRMEMORPTOTHERTO:D.L.ZiemannORIG3signedqCCOTHERSENTAECPDRxSENTLOCALPDRXCLASSUNCLASSXXXXPROPINFOINPUTXXXXNOCSREC'D40DOCKETNO:50-220DESCRIPTION:Ltrnotarized1-22-74,transthefollowing:PLANTNAME:NineMilePointUnit$P1ENCLOSURES:ProosedChanetoTechnicalSecifications:DensificationAnalysesandRelatedTechnicalSpecificationsChangesforType5andTypeDONOTREMOVEACKNOWLEDGED(3Orig637cysrec'd)FORACTION/INFORMATION1-23-74GCBUTLER(L)W/CopiesCLARK(L)W/CopiesGOLLER(L)W/CopiesKNIEL(L)W/CopiesSCHWENCER(L)W/CopiesSTOLZ(L)W/CopiesVASSALLO(L)'W/CopiesSCHEMEL(L)W/Copis~ZIEMANN(L)W/9CopiesDICKER(E)W/CopiesKNIGHTOH(E)"'/CopiesYOUNGBLOOD(E)W/CopiesINTERNALDISTRIBUTIONREGAN(E)W/CopiesW/CopiesW/CopiesW/CopiesAECPDR+GCFRSMP-506A~NTZING/STAFFCASEGIAMBUSSOBOYDMOORE(L)(BWR)DEYOUNG(L)(FllR)O'SKOVHOLT(L)P,COLLINSFILE&REGION(d))MORRISSTEELETECHREVIEWHENDRXESCHROEDERMACCARYKNIGHTPAWLXCKISHAOSTELLOHOUSTONNOVAKROSSXPPOLITOTEDESCOLONGLAINASBENAROYAVOLLMERDENTONGRIMESGAMMXLLKASTHERBALLARDSPANGLERENFIROMULLERDXCKERBRIGHTONYOUNGBLOODREGANPROJECTLDRHARLESSLICASSTHIGGS(L)GEARIN(L)GOULBOURNE(L)LEE(L)MAXGRET(L)SERVICE(L)SHEPPARD(E)SMITH(L)TEETS(L)WADE(E)WILLIAMS(E)WXLSON(L)A/TINDBRAITMANSALTZMANB,HURTPLANSMCDONALD~UBEw/XnputINFOC,MILESB.KINGv4.CABELL-LOCALPDROsweoN.Y.-DTXE(ABERNATHY)M-NSIC(BUCHANAN)1-ASLB(YORE/SAYRE/WOODARD/"H"ST.~6-CYSACRSMQDi}MKSENTTO1-23-74EXTERNALDISTRIBUTION(I)(2XIO).NATIONALLAB'SI-ASLBP(E/IlBldg,gm529)1-W.PENNINGTON>RmE"201GT1-CONSULTANT'SLXC~ASST'EWARK/BLUME/AGBABIANDXGGS,1-GERALDULRIKSON...ORNL1-PDR-SAN/LA/NY1-GERALDLELLOUCHEBROOKHAVENHAT.LAB1"AGMED(RuthGussman)RM-B-127,GT.1<<RD..MULLER.,F-309GT ljl~~0PhI'~
{{#Wiki_filter:AECDXSUTIONFORPART50DOCKETMATER(TEMPORARY FORM)CONTROLNO:FILE:8FROAA1:NiagaraMohawkPowerCorpSyracuse, N;Y.13202P.D.RaymondDATEOFDOC1-22-74DATEREC'D1-23-74LTRMEMORPTOTHERTO:D.L.ZiemannORIG3signedqCCOTHERSENTAECPDRxSENTLOCALPDRXCLASSUNCLASSXXXXPROPINFOINPUTXXXXNOCSREC'D40DOCKETNO:50-220DESCRIPTION:
t,h'egUlatoryDocketFileNIAGARAMOHAWKPOWERCORPORATIONNIAGARA~MOHAWK300ERIEBOULEVARD,WESTSYRACUSE.N.Y.13202January22,1974Mr.DennisL.Ziemann,ChiefOperatingReactorsBranch82DirectorateofLicensingUnitedStatesAtomicEnergyCommissionWashington,D.C.20545
Ltrnotarized 1-22-74,transthefollowing:
PLANTNAME:NineMilePointUnit$P1ENCLOSURES:
ProosedChanetoTechnical Secifications:
Densification AnalysesandRelatedTechnical Specifications ChangesforType5andTypeDONOTREMOVEACKNOWLEDGED (3Orig637cysrec'd)FORACTION/INFORMATION 1-23-74GCBUTLER(L)W/CopiesCLARK(L)W/CopiesGOLLER(L)
W/CopiesKNIEL(L)W/CopiesSCHWENCER(L)
W/CopiesSTOLZ(L)W/CopiesVASSALLO(L)
'W/CopiesSCHEMEL(L)
W/Copis~ZIEMANN(L)W/9CopiesDICKER(E)
W/CopiesKNIGHTOH(E)
"'/CopiesYOUNGBLOOD(E)
W/CopiesINTERNALDISTRIBUTION REGAN(E)W/CopiesW/CopiesW/CopiesW/CopiesAECPDR+GCFRSMP-506A~NTZING/STAFF CASEGIAMBUSSO BOYDMOORE(L)(BWR)DEYOUNG(L)(FllR)O'SKOVHOLT (L)P,COLLINSFILE&REGION(d))
MORRISSTEELETECHREVIEWHENDRXESCHROEDER MACCARYKNIGHTPAWLXCKISHAOSTELLOHOUSTONNOVAKROSSXPPOLITOTEDESCOLONGLAINASBENAROYAVOLLMERDENTONGRIMESGAMMXLLKASTHERBALLARDSPANGLERENFIROMULLERDXCKERBRIGHTONYOUNGBLOOD REGANPROJECTLDRHARLESSLICASSTHIGGS(L)GEARIN(L)GOULBOURNE (L)LEE(L)MAXGRET(L)SERVICE(L)SHEPPARD(E)SMITH(L)TEETS(L)WADE(E)WILLIAMS(E)WXLSON(L)A/TINDBRAITMANSALTZMANB,HURTPLANSMCDONALD~UBEw/XnputINFOC,MILESB.KINGv4.CABELL-LOCALPDROsweoN.Y.-DTXE(ABERNATHY)
M-NSIC(BUCHANAN) 1-ASLB(YORE/SAYRE/
WOODARD/"H" ST.~6-CYSACRSMQDi}MKSENTTO1-23-74EXTERNALDISTRIBUTION (I)(2XIO).NATIONAL LAB'SI-ASLBP(E/Il Bldg,gm529)1-W.PENNINGTON>
RmE"201GT1-CONSULTANT'S LXC~ASST'EWARK/BLUME/AGBABIAN DXGGS,1-GERALDULRIKSON...ORNL 1-PDR-SAN/LA/NY 1-GERALDLELLOUCHE BROOKHAVEN HAT.LAB1"AGMED(Ruth Gussman)RM-B-127, GT.1<<RD..MULLER.,F-309 GT ljl~~0PhI'~
t,h'egUlatory DocketFileNIAGARAMOHAWKPOWERCORPORATION NIAGARA~MOHAWK300ERIEBOULEVARD, WESTSYRACUSE.
N.Y.13202January22,1974Mr.DennisL.Ziemann,ChiefOperating ReactorsBranch82Directorate ofLicensingUnitedStatesAtomicEnergyCommission Washington, D.C.20545


==DearMr.Ziemann:==
==DearMr.Ziemann:==
JAN23)974~'L'InA)EIIpn~It-iiVu~~Re:NineMilePointUnit1AECDocketNo.50-220NiagaraMohawkPowerCorporationhascommittedinitsletterofOctober15,1973tosupplyanalysestodeterminetheeffectsoffueldensi-ficationnandtheappropriatechangestoTechnicalSpecificationsforthefueltobeinsertedduringtheSpring1974refueling.Theanalyseshavebeenperformedusingthe,guidanceprovidedintheenclosuretoyourDecember5,1973letter,"ModifiedGEModelf'rFuelDensification".TheseanalysesandtheproposedTechni:calSpecificationchangesareattachedherewith.Itisanticipatedthatthesechangeswillnotlimitplantpowerlevelbelowitsfulldesignratingof1850megawattsforpowerdistributionsexpectedduringnormaloperation.TheSiteOperationsReviewCommjtteeandtheSafetyReviewand.AuditBoardconcurwiththeseproposedTelchnicalSpecificationchanges.Verytrulyyours,Viceesident-Engineering/sqAttachmentSubscribedandsworntobeforemethis~~ayofJanuary,1974.VALERIEhl.KELLYNoteryPobhcinthe'teteofNewYorkQoeliiledInOnon.Eo..No.3Cn50C729~MyCorernlrrlonfnplret"Merch30rl9rIrr'~,JANP3)ygIEENCE'UqplrQQ,~fyICII)CEERX rI  
JAN23)974~
~.,,,,<<,,RegulatoryDocketFileSpecificationChangesForgoaeraa~e.nnaiadType5andType6FuelI.AnalsesofFuelDensificationEffectsThissectionpresentsresultsoftheeffectsofdensificationinthe8x8reloadfuelasdeterminedfromapplicationofthemodelsdescribedinJRefer'ence1.A.LocalPowerSpikinA'nanalysi'sofpotentiallocalpower.spikesduetoaxialgapsinafuelpelletcolumnforGeneralElectricBMR'semployinqanRx8fuellatticedesignhasbeenperformed.ThisanalysisemploysthesamemethodandbasicassumotionsthatwerereportedinReferencel.Importantasnects.'fthisanalysisarenotedasfo11ows:l.The,equationemployedtocalculatemaximumqapsizeisthatnotedinReference1:dL=~965-+0.0025)L2wheredL=maximumaxialqaolengthL=fuelcolumnlengthPi=meanvalueofmeasuredinitialplletdensity(immersion-.5X)0.0025=allowanceforirradiationinducedcladdinggrowthandaxialstraincausedbyfuel-cladmechanicalinteraction.2.Themagnitudeofthepowerspikeversusgapsizeforfuelrodsofthe8x8desiqnisshowninFigure1fornormaloperatingconditionsandFigure2forcoldzerovoidconditions.  
'L'InA)EIIpn~It-iiVu~~
~4  3.Thecorepowerhistogramemployedv>>asfora13.4kl</ftCmaximumdesignlinearheatgenerationrate:.seeFigure3.TheresultsfromthisanalysisareshowninFiaure4withinitialfueldensityasaparameter.Thelineshownforaninitialfueldensityof95%T.D.isconsideredtobemostrepresentativeconsideringcurrntGeneralElectricdataonmanufacturedfuelpelletdensities.ThepowersnikepenaltyshowninFigure4forseveralmeanpelletdensitiesasafunctionofaxialposition,istherequiredmarginwhichmustbemaintaineddurinqnormalooerationbetweentheactualpeakoperatingconditionandtheoeakdesignLHGR;i.e.,13.4kM/ft,Maintainingthismarginwillassure,withbetterthan95%confidence,thatnomorethanonerodwillexceedthedesiqnneakLHGRduetotherandomoccurrenceofpowerspikes-resultingfromaxialfuelcolumngans.ConsistentwithGeneralElectric'spositionondensificationpreviouslydiscussedinReference2anditssupplements,theresultsofthisanalysisareconsideredtoheaveryconservativerepresentationofthepoweroeakinqpenaltyrequiredtoaccommodate4potentialaxialfuelcolumngapsduringnormaloperatingconditionsinGeneralElectricBHR's.SincetheresultsofthepowerspikinqanalysisfornormalonerationwillbeutilizedtolimitbundlepowertoassurethattherandomoccurrenceofpowerspikeswillnotresultinexceedingthedesignpeakLHGR,itisnotbelievednecessarytoseparatelyconsiderpowersnikesintheanalysisoftransientsoraccidentswhichhaveasaninitialconditionsomeformofnormaloneration.Thecontrolroddropaccidentisuniqueintherespectthatitbeginsatthecoldcondition,andisnotaffectedbynormaloperatingpowerlevel.Further,theexistenceoffuelcolumngapscanresultinoowerspikinginthecoldcondition duringacontrolroddropwhichshouldthusbeconsideredintheevaluationofthisaccident.Forthispurpose,aseparatepowerspikinqanalysishasbeenperformedusingthesameassumptionsasindicatedabove,butemployinaapowerspikeversusgapsizecalculatedtooccurinthecoldconditionwithzerovoWs(Figure2).Thisanalysiswasperformedforaconservativemaximumgapsizecalculatedemployingapelletaverageimmersiondensityof94.5&#xc3;T.D.,andapositionnearthetopofthecoreinordertomaximizetheoowersnikingeffect.Thisanalysisyieldeda99Kprobabil'ityth'atanyqivenfuelrodwouldhaveapowerspikeof45K.B.CladdingCreepCollapseUsingthesameconservativebasespresentedinReferences1and2,thecriticalpressureratio;i.e.,ratioofcollapsepressuretoactualcoolantpressure,wascalculated.Figure5presentsthecladmid-walltemperatureversustimeforthe8x8reloadfuel..Nocreditistakenforinternalqaspressureduetoreleasedfissiongasorvolatiles.Theinternalpressureduetoheliumbackfillat1atmosphereduringfabricationisconsidered.Thefuelcharacteristicsforcreepcollapse'calculationsareasfollows:CladO.D.,in.CladThickness,in.0.4930.034+0:003PeakLHGR,kw/ft13.4FastFluxvlNev.n/cm2-sec4.37x1013Figure6givesthecalculatedcriticalpressureratio.Asevidencedbythecurve,thecalculatedcriticaloressureratioisalwayso1.0.C.IncreasedLinearHeatGenerationRateThefollowingexpressionwasemployedtocalculatethedecreaseinfuelcolumnlengthduetodensificationincalculationofapenaltyinlinearheatgenerationrate:~0.965-5L=2L 0~I WherehL=decreaseinfuelcolumn.lengthL=fuelcolumnlengthp;=meanvalueofmeasuredinitialpelletdensity(immersion-.5/}Thelengthreductionduetodensificationascalculatedbytheaboveequationrequiresknowledgeofthemeanimmersiondensity(p;}obtainedfromthegCdata.Acorrectionof0-.5AT.D.isappliedtoconverttheimmersiondensitytoageometricdensity.ThemeanpelletimmersiondensityforNineMilePoint18xSreloadfuelis95.29/.T.D.Thisresultsin:AL=0.965-0.9529-0.005=0.01709=0.009L22orAL=0.9XLDue=-tothermalexpansion,anSxSpelletnormallyexnandsingoinqfromthecoldtohotcondition,anamountequalto1.25forapelletat13.4kW/ft.Thisincreaseinlengthfromthecoldtohotconditionisnottakencreditforineitherdesigncalculationsorintheprocessofcorenerformanceanalysisduringreactoroperations.Thecoldpelletlengthisassumedfortheseconditions.Therefore,thedecreaseinpelletlengthduetodensificationismorethanoffsetbypelletaxialthermalexpansion.D.DecreasedPellet-CladThermalConductivitFigure7providesplotsofMaximumAveragePlanarLinearHeatGenerationRate(MAPLHGR)versusexposure,forNineMilePointSx8reloadfuel.Them(omega}curveissuitableforincorporationintotheplanttechnicalspecifications.TheLOCAanalyseswereperformedusingtheapprovedInterimAcceotanceCriteriaModelwithgapconductancevaluesascalculatedperthenewGEGAPIIImodelwithAECmodifications.(1}  
Re:NineMilePointUnit1AECDocketNo.50-220NiagaraMohawkPowerCorporation hascommitted initsletterofOctober15,1973tosupplyanalysestodetermine theeffectsoffueldensi-ficationn andtheappropriate changestoTechnical Specifications forthefueltobeinsertedduringtheSpring1974refueling.
Theanalyseshavebeenperformed usingthe,guidanceprovidedintheenclosure toyourDecember5,1973letter,"Modified GEModelf'rFuelDensification".
TheseanalysesandtheproposedTechni:cal Specification changesareattachedherewith.
Itisanticipatedthatthesechangeswillnotlimitplantpowerlevelbelowitsfulldesignratingof1850megawatts forpowerdistributions expectedduringnormaloperation.
TheSiteOperations ReviewCommjttee andtheSafetyReviewand.AuditBoardconcurwiththeseproposedTelchnical Specification changes.Verytrulyyours,Viceesident-Engineering
/sqAttachment Subscribed andsworntobeforemethis~~ayofJanuary,1974.VALERIEhl.KELLYNoteryPobhcinthe'teteofNewYorkQoeliiled InOnon.Eo..No.3Cn50C729~MyCorernlrrlon fnplret"Merch30rl9rIrr'~,JANP3)ygI EENCE'Uqp lrQQ,~fyICII)CEERX rI  
~.,,,,<<,,
Regulatory DocketFileSpecification ChangesForgoaeraa~e.
nnaiadType5andType6FuelI.AnalsesofFuelDensification EffectsThissectionpresentsresultsoftheeffectsofdensification inthe8x8reloadfuelasdetermined fromapplication ofthemodelsdescribed inJRefer'ence1.A.LocalPowerSpikinA'nanalysi's ofpotential localpower.spikesduetoaxialgapsinafuelpelletcolumnforGeneralElectricBMR'semployinq anRx8fuellatticedesignhasbeenperformed.
Thisanalysisemploysthesamemethodandbasicassumotions thatwerereportedinReference l.Important asnects.'fthisanalysisarenotedasfo11ows:l.The,equationemployedtocalculate maximumqapsizeisthatnotedinReference 1:dL=~965-+0.0025)L2wheredL=maximumaxialqaolengthL=fuelcolumnlengthPi=meanvalueofmeasuredinitialplletdensity(immersion
-.5X)0.0025=allowance forirradiation inducedcladdinggrowthandaxialstraincausedbyfuel-clad mechanical interacti on.2.Themagnitude ofthepowerspikeversusgapsizeforfuelrodsofthe8x8desiqnisshowninFigure1fornormaloperating conditionsandFigure2forcoldzerovoidconditions.  
~4  3.Thecorepowerhistogram employedv>>asfora13.4kl</ftCmaximumdesignlinearheatgeneration rate:.seeFigure3.TheresultsfromthisanalysisareshowninFiaure4withinitialfueldensityasaparameter.
Thelineshownforaninitialfueldensityof95%T.D.isconsidered tobemostrepresentative considering currntGeneralElectricdataonmanufactured fuelpelletdensities.
ThepowersnikepenaltyshowninFigure4forseveralmeanpelletdensities asafunctionofaxialposition, istherequiredmarginwhichmustbemaintained durinqnormalooeration betweentheactualpeakoperating condition andtheoeakdesignLHGR;i.e.,13.4kM/ft,Maintaining thismarginwillassure,withbetterthan95%confidence, thatnomorethanonerodwillexceedthedesiqnneakLHGRduetotherandomoccurrence ofpowerspikes-resulting fromaxialfuelcolumngans.Consistent withGeneralElectric's positionondensification previously discussed inReference 2anditssupplements, theresultsofthisanalysisareconsidered toheaveryconservative representation ofthepoweroeakinqpenaltyrequiredtoaccommodate 4potential axialfuelcolumngapsduringnormaloperating conditions inGeneralElectricBHR's.Sincetheresultsofthepowerspikinqanalysisfornormaloneration willbeutilizedtolimitbundlepowertoassurethattherandomoccurrence ofpowerspikeswillnotresultinexceeding thedesignpeakLHGR,itisnotbelievednecessary toseparately considerpowersnikesintheanalysisoftransients oraccidents whichhaveasaninitialcondition someformofnormaloneration.
Thecontrolroddropaccidentisuniqueintherespectthatitbeginsatthecoldcondition,andisnotaffectedbynormaloperating powerlevel.Further,theexistence offuelcolumngapscanresultinoowerspikinginthecoldcondition duringacontrolroddropwhichshouldthusbeconsidered intheevaluation ofthisaccident.
Forthispurpose,aseparatepowerspikinqanalysishasbeenperformed usingthesameassumptions asindicated above,butemployina apowerspikeversusgapsizecalculated tooccurinthecoldconditionwithzerovoWs(Figure2).Thisanalysiswasperformed foraconservative maximumgapsizecalculated employing apelletaverageimmersion densityof94.5&#xc3;T.D.,andapositionnearthetopofthecoreinordertomaximizetheoowersnikingeffect.Thisanalysisyieldeda99Kprobabil'ity th'atanyqivenfuelrodwouldhaveapowerspikeof45K.B.CladdingCreepCollapseUsingthesameconservative basespresented inReferences 1and2,thecriticalpressureratio;i.e.,ratioofcollapsepressuretoactualcoolantpressure, wascalculated.
Figure5presentsthecladmid-walltemperature versustimeforthe8x8reloadfuel..Nocreditistakenforinternalqaspressureduetoreleasedfissiongasorvolatiles.Theinternalpressureduetoheliumbackfillat1atmosphere duringfabrication isconsidered.
Thefuelcharacteristics forcreepcollapse'calculations areasfollows:CladO.D.,in.CladThickness, in.0.4930.034+0:003PeakLHGR,kw/ft13.4FastFluxvlNev.n/cm2-sec 4.37x1013Figure6givesthecalculated criticalpressureratio.Asevidenced bythecurve,thecalculated criticaloressureratioisalwayso1.0.C.Increased LinearHeatGeneration RateThefollowing expression wasemployedtocalculate thedecreaseinfuelcolumnlengthduetodensification incalculation ofapenaltyinlinearheatgeneration rate:~0.965-5L=2L 0~I WherehL=decreaseinfuelcolumn.lengthL=fuelcolumnlengthp;=meanvalueofmeasuredinitialpelletdensity(immersion
-.5/}Thelengthreduction duetodensification ascalculated bytheaboveequationrequiresknowledge ofthemeanimmersion density(p;}obtainedfromthegCdata.Acorrection of0-.5AT.D.isappliedtoconverttheimmersion densitytoageometric density.Themeanpelletimmersion densityforNineMilePoint18xSreloadfuelis95.29/.T.D.Thisresultsin:AL=0.965-0.9529-0.005=0.01709=0.009L22orAL=0.9XLDue=-tothermalexpansion, anSxSpelletnormallyexnandsingoinqfromthecoldtohotcondition, anamountequalto1.25forapelletat13.4kW/ft.Thisincreaseinlengthfromthecoldtohotcondition isnottakencreditforineitherdesigncalculations orintheprocessofcorenerformance analysisduringreactoroperations.
Thecoldpelletlengthisassumedfortheseconditions.Therefore, thedecreaseinpelletlengthduetodensification ismorethanoffsetbypelletaxialthermalexpansion.
D.Decreased Pellet-Cl adThermalConductivitFigure7providesplotsofMaximumAveragePlanarLinearHeatGeneration Rate(MAPLHGR) versusexposure, forNineMilePointSx8reloadfuel.Them(omega}curveissuitableforincorporation intotheplanttechnical specifications.
TheLOCAanalyseswereperformed usingtheapprovedInterimAcceotance CriteriaModelwithgapconductance valuesascalculated perthenewGEGAPIIImodelwithAECmodifications.(1
}  


REFERENCESl.Hinds,J.A.,(GeneralElectric)lettertoY.A.Hoore(USAEC),"PlantEvaluationswithGEGAPIII,"December12,1973.2."GenericDesignInformationforGeneralElectricReloadFuel",NEDO-20103;September1973.3.NEDtl-10735,Supplement6,"FuelDensificationEffectsonGeneralElectricBoilingMaterReactorFuel,"August1973.  
REFERENCES l.Hinds,J.A.,(GeneralElectric) lettertoY.A.Hoore(USAEC),"PlantEvaluations withGEGAPIII,"December12,1973.2."GenericDesignInformation forGeneralElectricReloadFuel",NEDO-20103; September 1973.3.NEDtl-10735, Supplement 6,"FuelDensification EffectsonGeneralElectricBoilingMaterReactorFuel,"August1973.  


,7.0~FIGURE18x8POWERSPIKEVERSUSGAPSIZE-NORMALOPERATION6.05.0hPp4.0(I)3.02.01.00RODRELATIONSHIP(gO2OeO2O3O5O~05gonadjacentPellet-npod59~opg~o~ongo<~9@9dyponRod8apinRogreccdg5onRod81EffectofagapinRoEffecofa9dg4onRodNEffectofa9ap01.02,03.0GAPSIZE(CM)4.05.06.0  
,7.0~FIGURE18x8POWERSPIKEVERSUSGAPSIZE-NORMALOPERATION 6.05.0hPp4.0(I)3.02.01.00RODRELATIONSHIP (gO2OeO2O3O5O~05gonadjacentPellet-npod59~opg~o~ongo<~9@9dyponRod8apinRogreccdg5onRod81EffectofagapinRoEffecofa9dg4onRodNEffectofa9ap01.02,03.0GAPSIZE(CM)4.05.06.0  


FIGURE28x8POWERSPIKEVERSUSGAPSIZE-COLDZEROVOIDCONDITIONRODRELATIONSHIPSOlO2O4020305o~O4O~0~~0o~d>onRod1inRooggaP~"<~g.ectoRod4onRod1EffectofqapinREffectofgapvariRod5onRod]GAPSIZE(Cg)  
FIGURE28x8POWERSPIKEVERSUSGAPSIZE-COLDZEROVOIDCONDITION RODRELATIONSHIPS OlO2O4020305o~O4O~0~~0o~d>onRod1inRooggaP~"<~g.ectoRod4onRod1EffectofqapinREffectofgapvariRod5onRod]GAPSIZE(Cg)  


FIGURE34.01.21.0.8.6A'.0C).2012LHGR(KH/FT=X)13140  
FIGURE34.01.21.0.8.6A'.0C).2012LHGR(KH/FT=X)13140  


FIGURE48x8POMERSPIKEPENALTYYSAXIALPOSITION-NORMALOPERATION1.02.03.096,095.04.04.03.094.02.095.096.056-7DISTANCEFROMBOTTOMOFCORE(FEET)81012  
FIGURE48x8POMERSPIKEPENALTYYSAXIALPOSITION-NORMALOPERATION 1.02.03.096,095.04.04.03.094.02.095.096.056-7DISTANCEFROMBOTTOMOFCORE(FEET)81012  


690FIGURE5CLADDINGAVERAGETEMPERATUREATAFUELCOLUMNAXIALGAP6806706606500640UJ63062086'j0a-6005905805705605500IRRADIATIONTIME,YEARS  
690FIGURE5CLADDINGAVERAGETEMPERATURE ATAFUELCOLUMNAXIALGAP6806706606500640UJ63062086'j0a-6005905805705605500IRRADIATION TIME,YEARS  


4.0FIGURE6CLADCRITICALCOLLAPSEPRESSURERATIOVERSUSTIME8x8RELOADFUEL3.01.023IRRADIATIONTIME,YEARS 0
4.0FIGURE6CLADCRITICALCOLLAPSEPRESSURERATIOVERSUSTIME8x8RELOADFUEL3.01.023IRRADIATION TIME,YEARS 0
I716FIGURE7MAPLHGRVERSUSEXPOS'MAXIMUMALLOWABLETOSTAYBELOWCURRENTTECHNICALSPECIFICATIONLIMITFORLHGR0MAXIMUMALLOWABLEWITHGEGAPIIIANDAEClODIFICATIONS15~1413~12OC1005,00010,00015,00020,000AVERAGEPLANAREXPOSURE(mWd/t)25,00030,000  
I716FIGURE7MAPLHGRVERSUSEXPOS'MAXIMUMALLOWABLE TOSTAYBELOWCURRENTTECHNICAL SPECIFICATION LIMITFORLHGR0MAXIMUMALLOWABLE WITHGEGAPIIIANDAEClODIFICATIONS 15~1413~12OC1005,00010,00015,00020,000AVERAGEPLANAREXPOSURE(mWd/t)25,00030,000  


II.ProposedChanestoTechnicalSpecificationsChangepages37a,37b,37c,etc.asfollows:~ChaneAAddtheattachedFigure3.1.7etotheTechnicalSpecification.UndertheLimitingConditionforOperation3.1.7,addFigure3.1.7etothelistoffiguresattheendofthelastsentenceinparagrapha.~ChaneBRep'lacethenotes;totheequationinLimitingConditionsforOoeration3.1.7bwiththefollowing:"LHGRd=DesignLHGR=17.5kw/ftfor7x7fuelor13.4kw/ftfor8x8fuelQp/p)~AX=Maximumpowerspikingpenalty'0.040for7x7fuelor0.027forBx8fuel.LT=TotalCorelenath=12ft.L=Axialpositionabovebottonofcore"~ChaneCAddFigure3.1.7etothelistoffiquresinthethirdoaraaranhoftheBases3.1.7a.ReasonsforChanesA,BRCTheresultsofanalysesperformedfor8x8reloadfuelhasindicatedthatlimitsonflAPLHGRandpowersoikingoenaltiesduetodensificationarerequired.TheselimitsastheyapplytoType5andType6fuelarepresentedforincorporationintoNineNilePointUnit1TechnicalSpecifications.Similarlimitsforpreviouslyloaded7x7fuelarealreadynartof-the'echnicalSpecifications.
II.ProposedChanestoTechnicalSpecificationsChangepages37a,37b,37c,etc.asfollows:~ChaneAAddtheattachedFigure3.1.7etotheTechnical Specification.
JIE 17NINEhflLEPOINT-PilIT116~4~14~13~12OC1005,00010,00015,00020,000AVERAGEPLANAREXPOSURE(ml<d/t)25,00030,000FIGURE'.1.7.eftAXIfGAUMALLOWABLEAVERAGEPLANARLHGRAPPLICABLETOFUELTYPE5and6 00A'l}}
UndertheLimitingCondition forOperation 3.1.7,addFigure3.1.7etothelistoffiguresattheendofthelastsentenceinparagraph a.~ChaneBRep'lacethenotes;totheequationinLimitingConditions forOoeration 3.1.7bwiththefollowing:
"LHGRd=DesignLHGR=17.5kw/ftfor7x7fuelor13.4kw/ftfor8x8fuelQp/p)~AX=Maximumpowerspikingpenalty'0.040for7x7fuelor0.027forBx8fuel.LT=TotalCorelenath=12ft.L=Axialpositionabovebottonofcore"~ChaneCAddFigure3.1.7etothelistoffiquresinthethirdoaraaranh oftheBases3.1.7a.ReasonsforChanesA,BRCTheresultsofanalysesperformed for8x8reloadfuelhasindicatedthatlimitsonflAPLHGRandpowersoikingoenalties duetodensification arerequired.
TheselimitsastheyapplytoType5andType6fuelarepresented forincorporation intoNineNilePointUnit1Technical Specifications.
Similarlimitsforpreviously loaded7x7fuelarealreadynartof-the'echnicalSpecifications.
JIE 17NINEhflLEPOINT-PilIT 116~4~14~13~12OC1005,00010,00015,00020,000AVERAGEPLANAREXPOSURE(ml<d/t)25,00030,000FIGURE'.1.7.eftAXIfGAUMALLOWABLE AVERAGEPLANARLHGRAPPLICABLE TOFUELTYPE5and6 00A'l}}

Revision as of 23:10, 29 June 2018

Nine Mile Point Nuclear Station, Unit 1 - Letter Submitting Analyses Which Determine Effects of Fuel Densification and Appropriate Changes to Technical Specifications for Fuel to Be Inserted During Spring 1974 Refueling
ML17037C516
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 01/22/1974
From: Raymond P D
Niagara Mohawk Power Corp
To: Ziemann D L
US Atomic Energy Commission (AEC)
References
Download: ML17037C516 (32)
v • d • e


Text

AECDXSUTIONFORPART50DOCKETMATER(TEMPORARY FORM)CONTROLNO:FILE:8FROAA1:NiagaraMohawkPowerCorpSyracuse, N;Y.13202P.D.RaymondDATEOFDOC1-22-74DATEREC'D1-23-74LTRMEMORPTOTHERTO:D.L.ZiemannORIG3signedqCCOTHERSENTAECPDRxSENTLOCALPDRXCLASSUNCLASSXXXXPROPINFOINPUTXXXXNOCSREC'D40DOCKETNO:50-220DESCRIPTION:

Ltrnotarized 1-22-74,transthefollowing:

PLANTNAME:NineMilePointUnit$P1ENCLOSURES:

ProosedChanetoTechnical Secifications:

Densification AnalysesandRelatedTechnical Specifications ChangesforType5andTypeDONOTREMOVEACKNOWLEDGED (3Orig637cysrec'd)FORACTION/INFORMATION 1-23-74GCBUTLER(L)W/CopiesCLARK(L)W/CopiesGOLLER(L)

W/CopiesKNIEL(L)W/CopiesSCHWENCER(L)

W/CopiesSTOLZ(L)W/CopiesVASSALLO(L)

'W/CopiesSCHEMEL(L)

W/Copis~ZIEMANN(L)W/9CopiesDICKER(E)

W/CopiesKNIGHTOH(E)

"'/CopiesYOUNGBLOOD(E)

W/CopiesINTERNALDISTRIBUTION REGAN(E)W/CopiesW/CopiesW/CopiesW/CopiesAECPDR+GCFRSMP-506A~NTZING/STAFF CASEGIAMBUSSO BOYDMOORE(L)(BWR)DEYOUNG(L)(FllR)O'SKOVHOLT (L)P,COLLINSFILE&REGION(d))

MORRISSTEELETECHREVIEWHENDRXESCHROEDER MACCARYKNIGHTPAWLXCKISHAOSTELLOHOUSTONNOVAKROSSXPPOLITOTEDESCOLONGLAINASBENAROYAVOLLMERDENTONGRIMESGAMMXLLKASTHERBALLARDSPANGLERENFIROMULLERDXCKERBRIGHTONYOUNGBLOOD REGANPROJECTLDRHARLESSLICASSTHIGGS(L)GEARIN(L)GOULBOURNE (L)LEE(L)MAXGRET(L)SERVICE(L)SHEPPARD(E)SMITH(L)TEETS(L)WADE(E)WILLIAMS(E)WXLSON(L)A/TINDBRAITMANSALTZMANB,HURTPLANSMCDONALD~UBEw/XnputINFOC,MILESB.KINGv4.CABELL-LOCALPDROsweoN.Y.-DTXE(ABERNATHY)

M-NSIC(BUCHANAN) 1-ASLB(YORE/SAYRE/

WOODARD/"H" ST.~6-CYSACRSMQDi}MKSENTTO1-23-74EXTERNALDISTRIBUTION (I)(2XIO).NATIONAL LAB'SI-ASLBP(E/Il Bldg,gm529)1-W.PENNINGTON>

RmE"201GT1-CONSULTANT'S LXC~ASST'EWARK/BLUME/AGBABIAN DXGGS,1-GERALDULRIKSON...ORNL 1-PDR-SAN/LA/NY 1-GERALDLELLOUCHE BROOKHAVEN HAT.LAB1"AGMED(Ruth Gussman)RM-B-127, GT.1<<RD..MULLER.,F-309 GT ljl~~0PhI'~

t,h'egUlatory DocketFileNIAGARAMOHAWKPOWERCORPORATION NIAGARA~MOHAWK300ERIEBOULEVARD, WESTSYRACUSE.

N.Y.13202January22,1974Mr.DennisL.Ziemann,ChiefOperating ReactorsBranch82Directorate ofLicensingUnitedStatesAtomicEnergyCommission Washington, D.C.20545

DearMr.Ziemann:

JAN23)974~

'L'InA)EIIpn~It-iiVu~~

Re:NineMilePointUnit1AECDocketNo.50-220NiagaraMohawkPowerCorporation hascommitted initsletterofOctober15,1973tosupplyanalysestodetermine theeffectsoffueldensi-ficationn andtheappropriate changestoTechnical Specifications forthefueltobeinsertedduringtheSpring1974refueling.

Theanalyseshavebeenperformed usingthe,guidanceprovidedintheenclosure toyourDecember5,1973letter,"Modified GEModelf'rFuelDensification".

TheseanalysesandtheproposedTechni:cal Specification changesareattachedherewith.

Itisanticipatedthatthesechangeswillnotlimitplantpowerlevelbelowitsfulldesignratingof1850megawatts forpowerdistributions expectedduringnormaloperation.

TheSiteOperations ReviewCommjttee andtheSafetyReviewand.AuditBoardconcurwiththeseproposedTelchnical Specification changes.Verytrulyyours,Viceesident-Engineering

/sqAttachment Subscribed andsworntobeforemethis~~ayofJanuary,1974.VALERIEhl.KELLYNoteryPobhcinthe'teteofNewYorkQoeliiled InOnon.Eo..No.3Cn50C729~MyCorernlrrlon fnplret"Merch30rl9rIrr'~,JANP3)ygI EENCE'Uqp lrQQ,~fyICII)CEERX rI

~.,,,,<<,,

Regulatory DocketFileSpecification ChangesForgoaeraa~e.

nnaiadType5andType6FuelI.AnalsesofFuelDensification EffectsThissectionpresentsresultsoftheeffectsofdensification inthe8x8reloadfuelasdetermined fromapplication ofthemodelsdescribed inJRefer'ence1.A.LocalPowerSpikinA'nanalysi's ofpotential localpower.spikesduetoaxialgapsinafuelpelletcolumnforGeneralElectricBMR'semployinq anRx8fuellatticedesignhasbeenperformed.

Thisanalysisemploysthesamemethodandbasicassumotions thatwerereportedinReference l.Important asnects.'fthisanalysisarenotedasfo11ows:l.The,equationemployedtocalculate maximumqapsizeisthatnotedinReference 1:dL=~965-+0.0025)L2wheredL=maximumaxialqaolengthL=fuelcolumnlengthPi=meanvalueofmeasuredinitialplletdensity(immersion

-.5X)0.0025=allowance forirradiation inducedcladdinggrowthandaxialstraincausedbyfuel-clad mechanical interacti on.2.Themagnitude ofthepowerspikeversusgapsizeforfuelrodsofthe8x8desiqnisshowninFigure1fornormaloperating conditionsandFigure2forcoldzerovoidconditions.

~4 3.Thecorepowerhistogram employedv>>asfora13.4kl</ftCmaximumdesignlinearheatgeneration rate:.seeFigure3.TheresultsfromthisanalysisareshowninFiaure4withinitialfueldensityasaparameter.

Thelineshownforaninitialfueldensityof95%T.D.isconsidered tobemostrepresentative considering currntGeneralElectricdataonmanufactured fuelpelletdensities.

ThepowersnikepenaltyshowninFigure4forseveralmeanpelletdensities asafunctionofaxialposition, istherequiredmarginwhichmustbemaintained durinqnormalooeration betweentheactualpeakoperating condition andtheoeakdesignLHGR;i.e.,13.4kM/ft,Maintaining thismarginwillassure,withbetterthan95%confidence, thatnomorethanonerodwillexceedthedesiqnneakLHGRduetotherandomoccurrence ofpowerspikes-resulting fromaxialfuelcolumngans.Consistent withGeneralElectric's positionondensification previously discussed inReference 2anditssupplements, theresultsofthisanalysisareconsidered toheaveryconservative representation ofthepoweroeakinqpenaltyrequiredtoaccommodate 4potential axialfuelcolumngapsduringnormaloperating conditions inGeneralElectricBHR's.Sincetheresultsofthepowerspikinqanalysisfornormaloneration willbeutilizedtolimitbundlepowertoassurethattherandomoccurrence ofpowerspikeswillnotresultinexceeding thedesignpeakLHGR,itisnotbelievednecessary toseparately considerpowersnikesintheanalysisoftransients oraccidents whichhaveasaninitialcondition someformofnormaloneration.

Thecontrolroddropaccidentisuniqueintherespectthatitbeginsatthecoldcondition,andisnotaffectedbynormaloperating powerlevel.Further,theexistence offuelcolumngapscanresultinoowerspikinginthecoldcondition duringacontrolroddropwhichshouldthusbeconsidered intheevaluation ofthisaccident.

Forthispurpose,aseparatepowerspikinqanalysishasbeenperformed usingthesameassumptions asindicated above,butemployina apowerspikeversusgapsizecalculated tooccurinthecoldconditionwithzerovoWs(Figure2).Thisanalysiswasperformed foraconservative maximumgapsizecalculated employing apelletaverageimmersion densityof94.5ÃT.D.,andapositionnearthetopofthecoreinordertomaximizetheoowersnikingeffect.Thisanalysisyieldeda99Kprobabil'ity th'atanyqivenfuelrodwouldhaveapowerspikeof45K.B.CladdingCreepCollapseUsingthesameconservative basespresented inReferences 1and2,thecriticalpressureratio;i.e.,ratioofcollapsepressuretoactualcoolantpressure, wascalculated.

Figure5presentsthecladmid-walltemperature versustimeforthe8x8reloadfuel..Nocreditistakenforinternalqaspressureduetoreleasedfissiongasorvolatiles.Theinternalpressureduetoheliumbackfillat1atmosphere duringfabrication isconsidered.

Thefuelcharacteristics forcreepcollapse'calculations areasfollows:CladO.D.,in.CladThickness, in.0.4930.034+0:003PeakLHGR,kw/ft13.4FastFluxvlNev.n/cm2-sec 4.37x1013Figure6givesthecalculated criticalpressureratio.Asevidenced bythecurve,thecalculated criticaloressureratioisalwayso1.0.C.Increased LinearHeatGeneration RateThefollowing expression wasemployedtocalculate thedecreaseinfuelcolumnlengthduetodensification incalculation ofapenaltyinlinearheatgeneration rate:~0.965-5L=2L 0~I WherehL=decreaseinfuelcolumn.lengthL=fuelcolumnlengthp;=meanvalueofmeasuredinitialpelletdensity(immersion

-.5/}Thelengthreduction duetodensification ascalculated bytheaboveequationrequiresknowledge ofthemeanimmersion density(p;}obtainedfromthegCdata.Acorrection of0-.5AT.D.isappliedtoconverttheimmersion densitytoageometric density.Themeanpelletimmersion densityforNineMilePoint18xSreloadfuelis95.29/.T.D.Thisresultsin:AL=0.965-0.9529-0.005=0.01709=0.009L22orAL=0.9XLDue=-tothermalexpansion, anSxSpelletnormallyexnandsingoinqfromthecoldtohotcondition, anamountequalto1.25forapelletat13.4kW/ft.Thisincreaseinlengthfromthecoldtohotcondition isnottakencreditforineitherdesigncalculations orintheprocessofcorenerformance analysisduringreactoroperations.

Thecoldpelletlengthisassumedfortheseconditions.Therefore, thedecreaseinpelletlengthduetodensification ismorethanoffsetbypelletaxialthermalexpansion.

D.Decreased Pellet-Cl adThermalConductivitFigure7providesplotsofMaximumAveragePlanarLinearHeatGeneration Rate(MAPLHGR) versusexposure, forNineMilePointSx8reloadfuel.Them(omega}curveissuitableforincorporation intotheplanttechnical specifications.

TheLOCAanalyseswereperformed usingtheapprovedInterimAcceotance CriteriaModelwithgapconductance valuesascalculated perthenewGEGAPIIImodelwithAECmodifications.(1

}

REFERENCES l.Hinds,J.A.,(GeneralElectric) lettertoY.A.Hoore(USAEC),"PlantEvaluations withGEGAPIII,"December12,1973.2."GenericDesignInformation forGeneralElectricReloadFuel",NEDO-20103; September 1973.3.NEDtl-10735, Supplement 6,"FuelDensification EffectsonGeneralElectricBoilingMaterReactorFuel,"August1973.

,7.0~FIGURE18x8POWERSPIKEVERSUSGAPSIZE-NORMALOPERATION 6.05.0hPp4.0(I)3.02.01.00RODRELATIONSHIP (gO2OeO2O3O5O~05gonadjacentPellet-npod59~opg~o~ongo<~9@9dyponRod8apinRogreccdg5onRod81EffectofagapinRoEffecofa9dg4onRodNEffectofa9ap01.02,03.0GAPSIZE(CM)4.05.06.0

FIGURE28x8POWERSPIKEVERSUSGAPSIZE-COLDZEROVOIDCONDITION RODRELATIONSHIPS OlO2O4020305o~O4O~0~~0o~d>onRod1inRooggaP~"<~g.ectoRod4onRod1EffectofqapinREffectofgapvariRod5onRod]GAPSIZE(Cg)

FIGURE34.01.21.0.8.6A'.0C).2012LHGR(KH/FT=X)13140

FIGURE48x8POMERSPIKEPENALTYYSAXIALPOSITION-NORMALOPERATION 1.02.03.096,095.04.04.03.094.02.095.096.056-7DISTANCEFROMBOTTOMOFCORE(FEET)81012

690FIGURE5CLADDINGAVERAGETEMPERATURE ATAFUELCOLUMNAXIALGAP6806706606500640UJ63062086'j0a-6005905805705605500IRRADIATION TIME,YEARS

4.0FIGURE6CLADCRITICALCOLLAPSEPRESSURERATIOVERSUSTIME8x8RELOADFUEL3.01.023IRRADIATION TIME,YEARS 0

I716FIGURE7MAPLHGRVERSUSEXPOS'MAXIMUMALLOWABLE TOSTAYBELOWCURRENTTECHNICAL SPECIFICATION LIMITFORLHGR0MAXIMUMALLOWABLE WITHGEGAPIIIANDAEClODIFICATIONS 15~1413~12OC1005,00010,00015,00020,000AVERAGEPLANAREXPOSURE(mWd/t)25,00030,000

II.ProposedChanestoTechnicalSpecificationsChangepages37a,37b,37c,etc.asfollows:~ChaneAAddtheattachedFigure3.1.7etotheTechnical Specification.

UndertheLimitingCondition forOperation 3.1.7,addFigure3.1.7etothelistoffiguresattheendofthelastsentenceinparagraph a.~ChaneBRep'lacethenotes;totheequationinLimitingConditions forOoeration 3.1.7bwiththefollowing:

"LHGRd=DesignLHGR=17.5kw/ftfor7x7fuelor13.4kw/ftfor8x8fuelQp/p)~AX=Maximumpowerspikingpenalty'0.040for7x7fuelor0.027forBx8fuel.LT=TotalCorelenath=12ft.L=Axialpositionabovebottonofcore"~ChaneCAddFigure3.1.7etothelistoffiquresinthethirdoaraaranh oftheBases3.1.7a.ReasonsforChanesA,BRCTheresultsofanalysesperformed for8x8reloadfuelhasindicatedthatlimitsonflAPLHGRandpowersoikingoenalties duetodensification arerequired.

TheselimitsastheyapplytoType5andType6fuelarepresented forincorporation intoNineNilePointUnit1Technical Specifications.

Similarlimitsforpreviously loaded7x7fuelarealreadynartof-the'echnicalSpecifications.

JIE 17NINEhflLEPOINT-PilIT 116~4~14~13~12OC1005,00010,00015,00020,000AVERAGEPLANAREXPOSURE(ml<d/t)25,00030,000FIGURE'.1.7.eftAXIfGAUMALLOWABLE AVERAGEPLANARLHGRAPPLICABLE TOFUELTYPE5and6 00A'l

Retrieved from "https://kanterella.com/w/index.php?title=ML17037C516&oldid=756831"