ML17255A630

Proposed Tech Spec Changes Deleting Restriction on Movement of Spent Fuel Shipping Casks W/Auxiliary Bldg Crane

ML17255A630
Person / Time
Site:	Ginna
Issue date:	01/18/1984
From:	ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17255A628	List: ML17255A626 ML17255A629 ML17255A630
References
NUDOCS 8401250293
Download: ML17255A630 (6)

Text

AttachmentAMakethefollowingchangesintheTechnicalSpecification.Removepage3.11-2Insertpage3.11-28401250293840ii8PDR*DOCK05000244PPDR

~~3.11.23.11.33.11.4e.Charcoaladsorbersshallbeinstalled'ntheventilationsystemexhaustfromthespentfuelstoragepitareaandshallbeoperable.Radiationlevelsinthespentfuelstorageareashallbemonitoredcontinuously.tThetrolleyoftheauxiliarybuildingcraneshallneverbestationedorpermittedtopassoverstoragerackscontainingspentfuel.Thespentfuelpooltemperatureshallbelimitedto150'F.Basis:Charcoaladsorberswillreducesignificantlytheconsequencesofarefuelingaccidentwhichconsidersthecladfailureofasingleirradiatedfuelassembly.Therefore,charcoaladsorbersshouldbeemployedwheneverirradiatedfuelisbeinghandled.Thisrequiresthattheventilationsystemshouldbeoperatinganddrawingairthroughtheadsorbers.Thedesiredairflowpath,whenhandlingirradiatedfuel,isfromtheoutsideofthebuildingintotheoperatingfloorarea,towardthespentfuelstoragepit,intotheareaexhaustducts,throughthe3~112AmendmentNo.21,P4,P5Proposed AppendixBInordertoremovetherestrictionagainstthehandlingofaspentfuelshippingcaskbytheauxiliarybuildingcrane,theproposedmodificationwouldsatisfytherequirementsfordefiningthecranetobesinglefailureproofinaccordancewithNUREG-0554.AccordingtoNUREG-0612,beingabletomovealoadinasinglefailureproofmodeobviatestheneedtoanalyzethecaskdropaccident.The40tonauxiliarybuildingcranehasbeenreanalyzedforamaximumcriticalload(MCL)of30.5tonscharacterizedasaspentfuel*shippingcaskwitharedundantyoke.In=brief,therequiredmodificationincludesthefollowing:1.Replacementofthemainhoistgearbox.2.Replacementofmainhoistdrumwithanewdrumwitha24"pitchdiameter.Thisistoaccommodatethelargerropediameter(3/4")andallowareaonbothendsofthedrumforadiscbrakesystemandanoverspeeddevice.3.Providingamainhoistreevingsystemwithdualropesanda10:1safetyfactor.Thissystemincludesnewhoistrope,hookblock,headblockandequalizerbar.4.TheadditionofaYoungstowntypepowerlimitswitchtobackuptheexistinggeartypecontrollimitswitch.Thisprovidesprotectionagainsttwoblockingforthemainhoist.5.Additionofanoverspeeddevicetomonitordrumspeed.6.Theadditionofcircuitrytopreventbridgeandtrolleytravelwhilethemainhoistisoperating.Thisisforhang-upprotection.7.Theadditionofstructureunderthedrumtopreventitfromdroppingifthedrumshaftfails.8.Providingabrakingsystemapplieddirectlytothedrumwithanoverspeedswitch...Thispreventslossofload.atthedrumifthedrumshaftoranypartofthehoistdrivefails.9..Additionofoverloadsensingdevicetomotorcircuitstoprotecthoistingsystemfromoverloadonloadhangup.10.Additionofafloatingrailclamponthebridgeandtrolleyrailstoholdthemduringaseismicoccurrence.*

ll.Installathreephaselimitswitchthatintheeventofonelegofthethreephasepowersupplyde-energizingthebrakesystemwillbeengagedandallmovementoftheloadandhoistsystemwillstop.AnalysishasshownthatthemodifiedcranewillbeabletoholdtheMCIduringnormaloperationandduringtheoccurrenceofasafeshutdownearthquake.Thefollowingtestingwillbecompleted:1.Materialtestinginaccordancewithsection2.4,NUREG-0554.2.Allweldjointswhosefailurecouldresultinthedropofacriticalloadwillbenondestructivelyexamined(Section2.6).3.Apost-modificationtestprogramthatmeetsthegeneralrequirementsofSection8ofNUREG-0554.Sincetheauxiliarybuildingcranewillbesingle-failureproof,nosinglefailurecanresultinafuelcaskdrop.Thereforeafuelcaskdropdoesnotneedtobeanalyzed.WhiletheproposedmodificationwillsatisfytherequirementsofNUREG-0612whilemovingloadsinthesinglefailureproofmode,itmaynot.bepossibletomoveallloadsatalltimesinthismanner.RG6Zwillcontinuetoanalyzeloadsthat,cannotbemovedinasinglefailureproofmodeonacasebycasebasistosatisfytherequirementofNUREG-0612bysomecombinationofloaddropanalysis,loadheightrestrictionsandloadpath.

~\AttachmentCInaccordancewith10CFR50.91thischangetotheTechnicalSpecificationshasbeenevaluatedagainstthreecriteriatodetermineiftheoperationofthefacilityinaccordancewiththeproposedamendmentwould:l.involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviously'evaluated;or2.createthepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyevaluated;or3.involveasignificantreductioninamarginofsafety.Asoutlinedbelow,RochesterGas&Electricsubmitsthattheissuesassociatedwiththisamendmentrequestareoutsidethecriteriaof10CFR50.91,andtherefore,anosignificanthazardsfindingiswarranted.ilAttachmentBdiscussesthemodificationtobemadetotheauxiliarybuildingcrane.Theadditionoftheseredundantsafetyfeatureswillpreventthelossofcontrolofaloadshouldthesinglefailureofanycranecomponentoccur.Thereforeanosignificanthazardsfindingiswarrantedforthefollowingreasons:Theprobabilityofaloaddropisdecreased.2.Thepossibilityofacreated.differentkindofaccidentisnot3.ThereisanincreaseinthemarginofsafetyforthemovementofanyloadequaltoorlessthantheMCI.

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