ML18331A183
| ML18331A183 | |
| Person / Time | |
|---|---|
| Site: | 07109375 |
| Issue date: | 11/27/2018 |
| From: | Bullard C Holtec |
| To: | Pierre Saverot Division of Spent Fuel Management |
| Saverot P | |
| Shared Package | |
| ML18331A181 | List: |
| References | |
| EPID L-2017-LLA-0059 | |
| Download: ML18331A183 (22) | |
Text
a generation ahead by design HISTARATB1TSTRUCTURALDESIGN&
QUALIFICATION ChuckBullard Director,EngineeringMechanics HoltecInternational KrishnaP.SinghTechnologyCampus 1HoltecBoulevard Camden,NewJersey,USA November13,2018
a generation ahead by design MeetingObjectives
- ToupdatetheNRCregardingHoltecs progresstowardsresolving the2nd RoundRAIsrelatedtothestructuralandcontainment designoftheHISTARATB1Tpackage
- ToreceivefeedbackfromtheNRCanddiscussanyconcerns regardingHoltecs plannedRAIresponsetoenhancethequality andtechnicalrigorofthefinalsubmittal 2
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a generation ahead by design PresentationOverview
- DesignEnhancements
- AcceptanceCriteria
- MaterialProperties
- HACDropSimulations
- PreliminaryResults
- Schedule
- OpenDiscussion 3
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a generation ahead by design DesignEnhancements
- NewImpactAbsorbers
- ReconfiguredLidSpacerBars
&MaintenanceCover
- ThickerBasePlate(Shielding)
- ReinforcedSealRegionon ClosureLid&Flange 4
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a generation ahead by design AcceptanceCriteria
- AcceptancecriteriaforHISTARATB1Tcontainmentsystemare developedwithdueconsiderationforNUREG1609andASMESection III,AppendicesEE&FF
- NUREG1609,StandardReviewPlanforTransportationPackagesfor RadioactiveMaterial
- IssuedinMarch1999byNRC
- Subsection4.5.3.1states:
Ifcomplianceisdemonstratedbyanalysis,verifythatthestructuralevaluationshowsthat thecontainmentboundary,sealregion,andclosureboltsdonotundergoanyinelastic deformationandthatthematerialsofthecontainmentsystem(e.g.,seals)donotexceed theirmaximumallowabletemperaturelimitswhensubjectedtotheconditionsin§71.71.
- Aboverequirementisindirectconflictwithstrainbasedacceptancecriteria establishedinASMESectionIII,AppendicesEE&FF 5
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a generation ahead by design AcceptanceCriteria(cont.)
- ASMESectionIII,AppendicesEE&FF
- Firstintroducedin2013EditionofASMECode(14yearsafterNUREG1609)
- Thegoalofthestrainbasedacceptancecriteriaistoestablishplasticstrainlimits thatarecapableofmaintainingtheallowableleakagerateidentifiedinDesign Specification,duringandafterenergylimitedevents.(FF1110)
- Strainbasedcriteriaarenotapplicabletoregionsofthecontainmentwherestrain deformationsaredetrimentaltomaintainingthedesiredleakagerate(e.g.,the sealingregionofaboltedclosure)(FF1126)
- ConsistentwithNUREG1609andASMEAppendicesEE&FFinelasticstrains arenotpermittedinsealregionofHISTARATB1TPackage
- Excludingthesealregion,theremainderofthecontainmentsystemisdesigned tomeettheallowablestrainlimitsperASMEAppendixFFfor9meterfreedrop and1meterpuncturetests,asclarifiedinSubsection2.1.2.2oftheHISTAR ATB1TSAR 6
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a generation ahead by design AcceptanceCriteria(cont.)
- AcceptanceCriteriaforClosureSealRegion&SurroundingAreas 7
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a generation ahead by design MaterialProperties
- TrueStressStrainCurvesUsedasInputtoLSDYNA
- SameapproachusedinHISTORMFWFSARfornonmechanistictipoveranalysis
- Basedonpowerlawrelationtorepresenttheflowcurveofmetalinplastic deformationregion
- MoredetailprovidedinHoltecPositionPaperDS307(Rev.2)whichwassubmitted withHISTORMFWLicenseApplication(Docket721032)
- Truestressstraincurvesusedforanalysisarebasedonmeanresultsfromuniaxial tensiletestingofcontainmentboundarymaterials
- TrueUniformStrain&TrueFailureStrain
- DeterminedbasedonuniaxialtensiletestingofmaterialconductedbyHoltec
- 98%exceedancevaluecalculatedbasedonresultsof5tests
- Meantestresultsshallagreewithin+/-10%ofCMTRdataforastestedmaterial 8
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a generation ahead by design MaterialProperties(cont.)
- WeldedMaterial
- TruestressstraincurveforweldedmaterialbasedonASMEminimumstrength propertiesforapplicableweldfillermetal
- Trueuniformstrainforweldedmaterialisconservativelyestimatedasthe98%
exceedancevalueforbasemetalmaterial(pertesting)multipliedbytheleast favorableuniformstrainratio(weldedvs.base)perFigureEE12301oftheASME Code 9
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- Truefailurestrainforwelded materialisconservatively estimatedasthe98%
exceedancevalueforbasemetal material(pertesting)multiplied bytheleastfavorablefailure strainratio(weldedvs.base)per FigureEE12301oftheASME Code
a generation ahead by design MaterialProperties(cont.)
- StrainRateCurves
- UsestrainratecurvesfromASMEAppendix EEfor304/304Lbaseandweldedmaterial
- ForNitronic 50material(SA182FXM19) thestrainratecurvesusedasinputare obtainedbyconservativelyscalingthe curvesfor304/304Lbasemetal
> Scalefactortobedeterminedby performingtensiletestsofNitronic 50 materialatdifferentstrainrates(5and10 in/in/sec)andcomparingamplification factorsagainstcorrespondingvaluesin TableEE12501
- ForInconelmaterial(SB637N07718)no creditwillbetakenforstrainrateeffects 10 CopyrightHoltecInternational
a generation ahead by design MaterialProperties(cont.)
- ActualMaterialUsedinFabrication
- FollowguidancefromEE1222(Step6)ofASMEAppendixEE
- Truestressstraincurves(basedonCMTRvalues)shallnotvarybymorethan+/-15%
fromdesignbasiscurvesusedasinputtoLSDYNA
- Ifvariationexceeds+/-15%,materialwillberejectedoradditionalanalyseswillbe performedtoqualifyheatspecificmaterialproperties 11 CopyrightHoltecInternational
a generation ahead by design HACDropSimulations
- Updatedlicenseapplicationincludesatotalofsix(6)9meterdrop simulationsandthree(4)1meterpuncturesimulations 12 DropOrientationsforthe9m(30ft)FreeDrop 1.
Top End Drop The package drops vertically and hits the ground at the top end.
2.
Bottom End Drop The package drops vertically and hits the ground at the bottom end.
3.
Side Drop with larger package surface impacting The package drops with its longitudinal axis oriented horizontally.
4.
C.G.O.C. (Primary Impact with Top End)
The centerofgravity of the package is directly above and aligned with the initial contact point at the cask top end.
5.
C.G.O.C. (Primary Impact with Bottom End)
The centerofgravity of the package is directly above and aligned with the initial contact point at the cask bottom end.
6.
Oblique Drop on Top Lid (a.k.a.
Slapdown)
The package orientation w.r.t the impact target corresponds to the quarterscale package oblique top down drop CopyrightHoltecInternational
a generation ahead by design TopEndDrop 13 Before Impact After Impact
a generation ahead by design BottomEndDrop 14 Before Impact After Impact
a generation ahead by design SideDrop 15 Before Impact After Impact
a generation ahead by design C.G.O.C. (Primary Impact with Top End) 16 Before Impact After Impact
a generation ahead by design Oblique Drop on Top Lid (a.k.a. Slapdown) 17 Before Impact After Impact
a generation ahead by design HACPunctureSimulations 18 DropOrientationsforthe1m(3ft)PunctureDrop 1.
TopEndPunctureDrop Thisparticulardropeventisconsideredcriticalsinceitchallenges theclosurelidandcouldpotentiallyopenuptheCLLSlocking wedgescontributingtolossofthegasketsealingfunction.
2.
SidePunctureDroponTrunnion Location The package drops with its longitudinal axis oriented horizontally and with a middle trunnion positioned directly above the puncture bar. Collapsible trunnion and trunnion sleeve material are ignored allowing the puncture bar to strike directly on the containment side wall.
3.
BottomC.G.O.C.PunctureDrop Thecenterofgravityofthepackageisdirectlyaboveandaligned withtheinitialcontactpointatthecaskbottomendandthe puncturebarbeneath.
Additionally,thepuncturesimulationpreservesthedamageand inelasticstrainsimpartedtotheHISTARATB1Tpackagefromthe bottomC.G.O.Cdropsimulationastheinitialcondition.
4.
TopC.G.O.C.PunctureDrop Thecenterofgravityofthepackageisdirectlyaboveandaligned withtheinitialcontactpointatthecaskbottomendandthe puncturebarbeneath.Additionally,thepuncturesimulation preservesthedamageandinelasticstrainsimpartedtotheHI STARATB1TpackagefromthetopC.G.O.Cdropsimulationasthe initialcondition.
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a generation ahead by design ObliqueDropontoPunctureDrop 19 CopyrightHoltecInternational Before Impact After Impact
a generation ahead by design PreliminaryResultsforSealing
- Notethatcalculatedstrainsforeachelementareamplifiedbytriaxiality factors(TF)determinedbyLSDYNAatcriticaltimesteps(forall elementswhereTF>1)
ResultsinthePrimarySealingRegion 20 CopyrightHoltecInternational DropOrientation StraininSealSeating Surfaceonthe TopFlange StrainontheSeal GroovesontheClosure Lid TopEnd None None BottomEnd None None Side None None 30ft.TopCGOC Followedby1m Puncture
~0.5%
~0.5%
a generation ahead by design Schedule
- HoltecplanstoresubmitHISTARATB1TLicensingPackageincludingresponses to2nd roundRAIsinthefirstquarterof2019 21 CopyrightHoltecInternational
a generation ahead by design OpenDiscussion EndofPresentation 22 CopyrightHoltecInternational