ML17037C513

Nine Mile Point Nuclear Station, Unit 1 - Letter Submitting Description of Proposed Modification. Change Consists of Providing an Extension to the Existing Reactor Building to Facilitate Spent Fuel Handling Operations

ML17037C513
Person / Time
Site:	Nine Mile Point
Issue date:	01/31/1974
From:	Raymond P D Niagara Mohawk Power Corp
To:	Skovholt D J US Atomic Energy Commission (AEC)
References
Download: ML17037C513 (12)

Text

(AZC~DISTRIBUTIONFOR,'PART50DOCKET1Q~PIAL(TEMPORARY>FORM)CONTROLNO:FILE:4961CLASSUNCLASSXXZXPROPINFOFROM:NiagaraMohawkPowerCorp.Syracuse,N.Y.13202P.D.RaymondTO:D."J.SkovholtDATEOFDOClgl>>74ORIG1signedINPUTXXXZXDATEREC'D2-4-74CCOTHERNOCSREC'DOTHERSENTAECPDRSENTLOCALPDRDOCKETNO'0-220LTRMEMORPTDESCRIPTION:Ltrtransthefollowing:PLANTN<~:NineMilePointUnitf51ENCLOSURES:RequestforachangetoProvOprLictoallowextensionto'theexistingbuildingto"facilitatespentfuelhandlingoperationsDONOTREMOVEACKNOWLEDGEDFORACTION/INFORMATION2-4-74GCBUTLER(L)W/CopiesCLARK(L)'M/CopiesGOLLER(L)M/CopiesKNIEL(L)W/CopiesSCHMENCER(L)W/CopiesSTOLZ(L)W/CopiesVASSALLO(L)W/CopiesSCHRtKL(L)M/CopiesREGAN(E)M/CopiesvrZIEMANN(L)M/9CopiesDICKER(E)W/CopiesKNIGHTON(E)'/CopiesYOUNGBLOOD(E)W/CopiesINTERNALDISTRIBUTIONW/CopiesW/CopiesW/CopiesMCPDRVOGC,ROOMP"506Av8UHTZING/STAFFCASEGIAMBUSSOBOYDMOORE(L)(BMR)j)EYOUNG(L)(PMR)~SKOVHOLT(L)P.COLLINSTECHREVIEWHENDRIESCHROEDERMACCARYKNIGHTPAWLICKISHAOSTELLOHOUSTONNOVAKROSSIPPOLITO~RUGOPRTEDESCOFILELREGION(@LONGMORRISLAINASSTEELEBENAROYAVOLLMERDENTONGRIMESGAMMILLKASTNERBALLARDSPANGLERENVLROMULLERDICKERKNIGHTONYOUNGBLOODREGANPROJECTLDRHARLESSLICASST~IGGS(L)GEARIN(L)GOULBOURNE(L)LEE(L)MAIGRET(L)SERVICE(L)SHEPPARD(E)SMITH(L)TEETS(L)MADE(E)WILLIAMS(E)WILSON(L)DURHAM(E)A/TINDBRAI3HANSALTZMANB.HURTPLANEMCDONALD~USEw/InputINFOC.MILESB.KINGVA.CABELLEXTERNALDISTRIBUTION-LOCALPDROsweoNY.-DTIE(ABERNATHY)(1)(2)(10)-NATIONALLAB'-NSIC(BUCHANAN)1-ASLBP(E/MBldg,Rm529)'ASLB(YORE/SAYRE/1-M.PENNINGTON,RmE-201GTMOODARD/"H"ST.'1-CONSULTANT'S'CYSACRSERKEEKSENTTO~LIC~ASST~NEMMARK/BL%K/AGBABIAN2-4-,74DIGGS1"GERALDULRIKSON...ORNLJ1-PDR-SAN/LA/NY1-GERALDLELLOUCH="BROOKHAVENNAT.LAB1"AGMED(RuthGussman)RM"B-127,GT.1-RD..MULLER..F-309GT 4~vIIf)If4I'aC~~IIIl'recfC JlRegulatoryDocketFileNIAGARAMOHAWKPOWERCORPORATION~L~ll),)l)l~NIAGARA~gf'OHAWK,~fr300ERIEBOULEVARDWESTSYRACUSE.N.Y.I3202FEB4)974eILAILSECTIONGQCKETCORKJanuary31,1974Mr.DonaldJ.SkovholtAssistantDirectorforOperatingReactorsDirectorateofLicensingUnitedStatesAtomicEnergyCommissionWashington,D.C.20545Oi.~wy>EBQIgpqIL~~log,'~g~+4am@ffIaIIEIf'@all-'SecIIRIOI

DearMr.Skovholt:

Re:NineMilePointUnit1DocketNo.50-220PursuanttoSection50.59oftheCommission'sRegulations,NiagaraMohawkplanstomakeachangeinitsfacilityunderProvisionalOperatingLicenseNo.DPR-17.Briefly,thischangeconsistsofprovidinganextensiontotheexistingreactorbuildingtofacilitatespentfuelhandlingoperations.Foryourinformation,adescriptionoftheproposedmodification,includingasafetyevaluation,isattached.Thisevaluationshowsthattheprobabilityofoccurrenceandtheconsequencesofanaccidentormalfunctionwouldbedecreased,andmargins.ofsafetyforspentfuelhandlingoperationsincreasedbythischange.TheproposedmodificationhasbeenreviewedandapprovedbytheSafetyReviewandAuditBoardandbytheSiteOperationsReviewCommittee.BothgroupsareoftheopinionthatnoadditionalpossibilityforanaccidentormalfunctionofadifferenttypethanevaluatedintheSafetyAnalysisReportwouldbecreated.Theyhave,alsoconcludedthatthischangewillnotpresentasignificanthazardsconsideration,butratherwillenhanceplantsafety.Weareenclosingtenadditionalcopiesforyourconvenience.Verytrulyyours,PhilipD.RaondVicePresident-EngineeringEnclosures869; IPK'T/'1,14~rLf0h4/AI~tfl!

>VRegulatoryDocketFiieREACTORBUILDINGEXTENSION'I-2/geegyid,i/LitDotI...'ntroductionThepresent.design=ofthereactorbuildingincludesadoublesealsystem"-toensure-.secondarycontainmentintegrity.'.Duringnormal.operation,.building-integrityismaintainedbyouterdoorsintherailroadbay.Whenaccessto.,.thebuildingisrequiredthroughtherailroad,baydoors,'hebaycanbeisolatedfromtherestofthereactorbuilding;AsdescribedintheFS'ARaboltedhatchcoveratElevation281feetisusedforthispurpose.SincetheinitialoperationofNineMilePointUnit1,tnedesignsofspentfuelcaskshavechanged.Theexisting=buildingdesigndoesnot'llowther,-useofcurrentrailroadcaskdesigns.-Inordertobring.therailcarintothebuildingandmaneuverthecask=intopositionforhoistinguptotheoperating*floor,.the"end:of.therailcarwouldhavetoextendthroughthe.'outerdoorwayoftherailroadbay.Sincethehatchwouldhavetobe'openforuse'fthereactorbuildingcrane,secondarycontainmentintegrity.couldnotbemaintained.Inordertoaccomodateuseof,currentrailroadcaskswhilemaintaining.secondarycontainment;a.changeto,theexistingreactorbuildingispl~~~~dAnextensionstructureistobeaddedtothereactorbuildingsothatspentIfuelloadingandshipping.canbeperformedinamopeexpeditiousmanner,Theextensionwillbepartofsecondarycontainmentandwi11haveanouterdoorseal.'Th'epresentouterdoorwillremainandwillbeusedtoisolatethisextensionstructurefromthe.reactorbuildingwhenaccesstothenew-bayis'required.Theneedforthehatch.would,beeliminated.(1)YolumeI,SectionYI.B.2.

II-flP~~t Page2tl.~0\Themodificationinvolvestheadditionofa20footby20footby80footlongairlockwith,a'swingdoodandanairtightseal.Thetrackbayextensionwillbeequippedwithamotoroperateddoubleswingdoor16feet0incheswideby17feet6incheshigh.Thedoorcanalsobeoperatedmanually,andisdesignedtoresist.aninternal:orexternalloadof'0psf.'Aone-pieceinflatablesealofReinforcedEthylenePropylene.DieneMonomerisprovidedaroundtheperimeterofeachhalfofthedoor.'heentirecontactareaofthein>latablesealwillexpandapproximately3/4inchunderpressure.The~sealmaterialwillremainpliableandsealat-temperaturesof-20Fto210F.AsshownonFigure1theextensionstructurehasapersonnelaccessdooron'henorth'side.adjacenttotheexisting.structure.Anairtightaccesspassagewaywillbeconstructedfromtheexistingaccessdoortothisdoorinthereactorbuildingextension.Procedural'ontrolonly/permitsoneofthesethreepassagewaydoorstobeopen.Thedoorswillhavelocalalarmssuchthatpersonnelabout-toenterorleavearealertedtotheconditionofthealternatedoors.Sufficientroomisavailabletocontaintherailcarwithaspentfuelshippingcaskandprovideadequatemaneuveringroomfortherailcarduringcaskloadingandunloading.TheproposedmodificationisshowninFigurel.Thisadditiontothereactorbu'ildingwi-1'1bed.signedtomeetall'herequirementsoftheoriginalreactorbuildingasdescribedintheFSAR--Thetrackbayextensionwillbeattachedtotheexistingreactorbuildingbyanairtightsealformedbetweenthetwobuildings.VolumeI,SectionYI.B.I 0,~r,fI Page3Theoutsidepanelingmaterialwillbeidenticaltothatusedabovetheoperat-'ngfloorinthereactorbuilding.Theinsulatedmetalwall-panels'andthemetalroof.dec):areofleak.-tightconstruction'.Theroofdeckiscoveredwithafive-ply.tarandfeltbuilt-uproof.Thenewandexistingdoorswillbealarmedandproceduralcontrolwillensurethatonlyonedoorinseriesmaybeopenatonetime.Secondarycontainmentwillbemaintainedatalltimes.Thisadditionalsc.allowsthehatchcovertobepermanentlyremovedandstillmaintainsecondarycontainment.Atthepresenttimehatchcoverremovaltakesabout12ho<<rs.Theoperationinvolvesunboltingorreboltingthehatchcover.Eliminationofthisstepwilloptimizecaskhandlingoperations.Aretestofsecondarycontainmentwill,beperformedafterthe'addition'asbeencompletedtoensurethatleakagecharacteristicshavenotbe'enchanged.III;'SunmarTheplannedmodificationsreducefuelcaskhandlingoperations.Therefore,the.probabilityofoccurenceof,anaccidentormalfunctionduringtheseopera-=tionsisreduced.Nochangetothebasicfunctionsof'hereactorbuildingandrailroadbayhavebeenmade.Therefore,nonewmodesofaccidentsormalfunctionshavebeen.created.Since-theadditionstothereactorbuildingwillbedesignedtothesameleaktightcriteriaoftheoriginaldesign,nochangeinthemarginofsafetydefinedintheTechnicalSpecificationswilloccur.

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Page4Based-ontheaboveanalysis,theplannedbuildingextensionwillnotintroduceanyunreviewedsafetyquestionsorcompromise,theintegrityofthereactorbuilding,butwillenhancesafetyaspectsofspentfuelshipping.

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