ML17321A898

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Submits Info Re Exxon Nuclear Co Eccs/Loca Analysis,Per 850930 Discussion W/Nrc.Error Found in TOODEE2 Code Re Calculation of Thermal Response of Hot Fuel Rod.Peak Cladding Temp Underpredicted.Calculations Revised
ML17321A898
Person / Time
Site: Robinson, Cook, 05000000
Issue date: 10/02/1985
From: ALEXICH M P
INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To: DENTON H R
Office of Nuclear Reactor Regulation
Shared Package
ML17321A899 List:
References
AEP:NRC:0940B, AEP:NRC:940B, NUDOCS 8510080292
Download: ML17321A898 (7)


Text

t.REGULATOR'NFORMATIONDISTRIBUTIONLITEM(RIDS)ACCESSIONNBR:8510080292'OC~DATE:85/10/02NOTARIZED:NOFACIL':50-000GenericDocket50-315DonaldC~CookNuclearPower-.PlantrUnit1~Indiana8AUTHBYNAME,AUTHORAFFILIATIONALEXICH<M,PEIndiana8MichiganElectricCo.RECIP~NAt1ERECIPIENTAFFILIATIONDENTONgH~ReOfficeofNuclearReactorRegulationiDirector~

SUBJECT:

.SubmitsinforeExxonNUclearCoECCS/LOCAanalysisqper850930discussionw/NRC,ErrorfoundinTOODEEZcoderecalculationofthermal.response'f-hotfuelrod+Peakcladtemp,underpredicated,Calculationsrevised,DISTRIBUTIONCODE:A001DCOPIESRECElVED;LTRENCL'SIZETITLE:ORSubmittal:GeneralDistributionNOTES:OL~10/25/74DOCKET050000000500031505000315RECIPIENTIDCODE/NAME,"NRRORB1BC01I~TER~AL:ACRS09.ELD/HDS3NRR/DLDIRNRR/DL/TSRGNRR/DSI/RABRGN3COPIESLTTRENCL7766011111RECIPIENTIDCODE/NAMEADM/LFMBNRR/DE'/MTEBNRR/DL/DRABNMETB'GILE04COPIESLTTRENCL0,1011-EXTERNAL;24XLPDRNSIC030511111EGE,GBRUSKEgSNRCPDR02TOTALNUMBER>>OF.COPIESREQUIREDLTTR28ENCL'5 4I0~IZP'kr"11,Nq~tlW'kir)IF.'el.ylk'h 0~INDIANA8MICHIGANELECTRICCOMPANYP.O.BOX16631COLUMBUS,OHIO43216October2,1985AEP:NRC:0940BDonaldC.CookNuclearPlantUnitNo.1DocketNo.50-315L'icense'No.DPR-58ERRORINEXXONLOCA/ECCSANALYSISMr.HaroldR.Denton,DirectorOfficeofNuclearReactorRegulationU.S.NuclearRegulatoryCommissionWashington,D.C.20555

DearMr.Denton:

ThisletterissubmittedpursuanttodiscussionswithyourstaffonSeptember30,1985.AttachedpleasefindtherecentinformationregardingtheECCS/LOCAanalysisforDonaldC.CookUnit1whichwasperformedbytheExxonNuclear-Company(ENC).ENCfoundanerrorintheinputtotheTOODEE2code,whichcalculatesthethermalresponseofthehotfuelrod.Theerrorconsistedoftheassignmentofarelativedecayheatpowerdensityof0.0intheouterringofthefuelpellet.Thisresultedinanunderpredictedpeakcladtemperature(PCT)at48l%1D/kg.TherevisedcalculationshavebeenperformedbyENCusingmorerealistic'valuesofthepelletdensity,andinternalrodpressure.ThesecalculationshaveresultedinaPCTof2189F,whichisincompliancewith10CFR50.46.TheinformationcontainedinthisletteranditsattachmentrepresentsacorrectionoftheanalysispresentedintheENCreportentitled,"D.C.CookUnit1LOCA-ECCSAnalysisforExtendedExposure"(XN-NF-83-61)andsubsequentrevision-transmittedvialetterAEP:NRC:0745TdatedMarch20,1985.hAfurtherJustificationforoperatingD.C.CookUnit1withtheexistingLOCA/ECCSAnalysisforExxonfuelwassubmittedonJune26,1985vialetterno.AEP:NRC:0940.ExxonhasverifiedthatthesensitivitystudyreferredtoinAEP:NRC:0940wasnotaffectedbytheerrorreportedinthisletter.

1~44VEit'Jh4V Mr.HaroldR.DentonAEP:NRC:0940BCurrently,DonaldC.CookUnit1isshutdown,andisscheduledforcriticalityonOctober12,1985.WebelievethatyourapprovalofthesubmittedinformationisrequiredpriortoD.C.CookUnit1beinginMode1.Therefore,yourtimelyprooessingoftheinformationsubmittedwouldbegreatlyappreciated.ThisinformationwillbereviewedbythePlantNuolearSafetyReviewCommittee(PNSRC)andtheNuclearSafetyandDesignReviewCommittee(NSDRC)attheirnextregularlyscheduledmeetings.ThisdocumenthasbeenpreparedfollowingCorporateprocedureswhichincorporateareasonablesetofcontrolstoinsureitsaccuracyandcompletenesspriortosignaturebytheundersigned.Verytrulyyours,cm.P.Aleich~y,VicePresidentiQ2'ttachmentsCC~JohnE.DolanW.G.Smith,Jr.-BridgmanG.Bruchmann~R.C.CallenR.CharnoffNRC"ResidentInspector-'BridgmanG."Ward,ENC-Riohland,Washington h04FgI Attachment1toAEP:NRC:0940B