ML14206B007

Considerations for Using Marinite in Refined GSI-191 Chemical Effects Testing. CCNPP-CHLE-009, Revision 4

ML14206B007
Person / Time
Site:	Calvert Cliffs
Issue date:	05/19/2014
From:	Kinsey S - No Known Affiliation
To:	Office of Nuclear Reactor Regulation
Morgan N S
References
CCNPP-CHLE-009, Rev 4
Download: ML14206B007 (6)

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CCNPPCHLE009,Rev.4May19,2014Page1of4ConsiderationsforusingMariniteinChemicalEffects(CE)TestingBackgroundMariniteisusedintheCalvertCliffsNuclearPowerPlant(CCNPP)containmentasafirebarrieroncabletrays.Mariniteisagenerictermofamixtureofcalciumsilicate,calciummetasilicate(wollastonite),andreenforcingfibers(fiberglass,organicfiberssuchascotton).TheMariniteatCCNPPismadebyBNZMaterialsandcomesinavarietyofformsrangingfrommoldedcasts,boards,andflour.BNZMaterialsMariniteIorMarethetypesofMarinitefoundintheCCNPPcontainment(Ref.1,Attachment13).BNZMaterialsMariniteIorMboardshaveanominaldensityof46lbs/cuft(Ref.1,Att.13,Page6of13)andarepromotedashavinghighstrengthanddamageresistance.Marinitedebrishistoricallyhasbeenmodeledas10µmparticulatespheresforhydrauliccharacteristicsindebrisbedheadlosstesting.TheuseofMariniteparticulateinchemicaleffectstestingisproblematicastheMariniteparticlesaredifficulttocontainandtendtotransporttothedebrisbedwhichincreasesdebrisbeddifferentialpressurethroughmechanicalinfluencestherebymaskingincreasesindebrisbeddifferentialpressurecausedbychemicaleffects.ApproachMariniteparticlesproducedduringmechanicalmanufacturingprocesses(assumedprettywellformedsphericalparticles)asmeasuredbyBNZMaterialsrangefromroughly44µmspheresto250plusµmsphereswith96%oftheparticlesbeinglargerthan44µmindiameter(Ref.3).ThereforedeterminingthesurfaceareabasedonclaimingALLare44µmspheresisconservative.Mariniteboardoftheappropriatetotalsurfaceareaequaltothe44µmspheresistobeusedinchemicaleffectstests.Theboardshavesurfaceroughness,evaluatedthattobeaboutRa=6.3µm.Thesurfaceroughnessappearedtobemostlyridgeslikeisoscelestrianglesthatcoveredthesurface.Therefore,theridgedsurfaceareaiscomputedperunitareaoftheMariniteboardandfoundtobe2.3xthatoftheflatboard.Assuming2.0xwasslightlyconservativeandbounding.(i.e.,401.6squaremetersof44µmsphereswouldneed401.6squaremetersofboard[areasoftop,bottom,andedgesincluded]dividedbythesurfaceroughnesseffectof2.0resultsin200.8squaremetersofboard).SonowtheamountofMariniteboardexposedsurfaceequaltothe44µmspheresappropriateforthechemicaleffectstestsisknown.Lastly,useofthatareaofboardwouldputmoremassofMariniteintothetestthatthesameareaof44µmspheres.Thatmasswouldbeavailabletodissolveinthetest;notthatitwilldissolve,justthatitispresentandcoulddissolve.Asthesurfacedissolvesaway,moreboardisexposed.Iftheprocessescandissolveallofthe44µmspheres,itmightbeabletodissolvemuchoftheboard(andmoremassthanisavailableinthespheres).Potentially,theuseofboardcouldbesignificantlyoverconservative.

CCNPPCHLE009,Rev.4May19,2014Page2of4RecommendedSurrogateforMariniteThefollowingaretheresponsesandrecommendedsurrogateforchemicaleffectstestingofMarinitefollowingahypotheticalLOCA:OutsideaHELBZOI:MariniteoutsideaHELBZOIwillnotbesourceofdebrisfines.MariniteoutsideaHELBZOImaybeeitherexposedtospraysorsubmerged.MariniteinserviceatCCNPPis1/2"thick(Ref.1,Att.10,Page5of8).Therefore,1/2"thickpiecesofBNZMaterialMariniteIorMboardareappropriateforCCNPPChemicalEffectstests.InsideaHELBZOI:MarinitedebrisfromaHELBZOIwillbesmallpieces(0.5%),largepieces(2.7%)and95.5%willremainintactonthecabletrayasintactpieces(Ref.2,Table3c12,"MariniteSizeDistribution",page97).1.3%oftheMariniteinsideaHELBZOIisassumedtofailasfines(particulate)(Ref.2,sametableasabove).MariniteSmallPieces,LargePieces,andIntactPieces 1/2"thickpiecesofMariniteIorMboardscanbeusedasasurrogateforMarinitesmallpieces,largepieces,andintactpieces.MariniteFines: MarinitefinescanbeusedinChemicalEffectstestingwherethetransportofparticulateisnotanissue,e.g.beakerbenchtoptests.MariniteparticulatecanbepurchasedfromBNZMaterialsasMariniteFines,amanufacturingbyproductfromsandingandcuttingofMariniteIandMboards.MariniteFinesisanappropriatesurrogateforMariniteparticulatefromaHELBZOIsincethebreakupbysandingandcuttingwouldbeanalogoustothebreakupoftheMariniteboardwithintheZOI.AttachedistheBNZMaterialsanalysisofMariniteFines(Ref3). 1/2"thickpiecesofMariniteIorMboardscanbeusedasasurrogateforMarinitefineswherethetransportofparticulateisproblematic.ThesurfaceareaoftheMariniteboardwillbecalculatedassumingtheMariniteparticulatetobe44µmindiameterasdiscussedaboveandpresentedbelow.SurfaceAreaofMariniteBoardtoRepresentFinesinChemicalEffectsTestingReference1determinedthat0.104cubicfeet(Ref.1,Page14,Section8.0)ofMariniteboardwouldbecomeparticulatedebrisinadesignbasisLOCAatCCNPP.Usingtheaboveevaluationof44µmdiameter,thisvolumeofMariniteparticulatewouldproduceanexposedsurfaceareaof4,323squarefeet.SuchscalingignoresthesurfacecontoursandroughnessoftheMariniteboard.

CCNPPCHLE009,Rev.4May19,2014Page3of4ComputationofParticulateParameters:1. 0.104cubicfeet=0.002945cubicmeters2. Spherevolumea. 44µmdiameter=4/3r3=4/3(44x106m/2)3=44.60x1015m3perparticle3. NumberofspheresthatequalstheabovevolumeofMariniteblasteda. Numberof44µmdiameterspheres=Volume/Volumeofonesphere=2.945x103m3/44.60x1015m3persphere=66.03x109spheres4. Spheresurfaceareaa. 44µmdiameter=4r2=4(44x106m/2)2=6.082x109m2perparticle5. TotalSurfaceAreaofSpheresa. 44µmdiameter=Numberofspheresxspheresurfacearea=66.03x109spheresx6.082x109m2persphere=401.6m2RecentevaluationofasampleofMariniteboardfromCCNPPdeterminedthesurfaceroughnesstobeRa=6.3µm.SeeFigure2foraphotographofasmallpieceofMarinite,approximately1inchlong.Assumingeachsurfacefeatureisa'ridge'6.3µmtallwithbaseof6.3micrometersandthesurfaceiscompletelycoveredbysuchfeatureswouldyieldanexposedsurfaceof2.23timestheapparentboardsurfaceassumingaperfectlysmoothsurface.Therefore,scalingparticulatetosurfaceareawithoutconsideringsurfaceroughnessresultsinagreaterthana2timesoverestimateofrequiredsurfacearea.Figure2:MariniteBoard,~3centimeterslong,SurfaceRoughnessRa=6.3µm CCNPPCHLE009,Rev.4May19,2014Page4of4ComputationofBulkMariniteSurfaceAreaParameters:1. AreaofRidge(assumedtobeisoscelestriangleincrosssection):a. 6.3µmtallwith6.3µmbasexlengthofthesample=2xLx=2xLx7.044µmperridge2. Numberofridges=width/6.3µm=W/6.3µm3. TotalRidgeArea=W/6.3µmx(2xLx7.044µmperridge)=WxLx2.236Therefore,theridgesincreasethesurfaceareabymorethanafactorof2.3x.Furthermore,useofahalfinchthickboardaddsmuchmoremasstothetest,allowinganydissolutiontoproceedtofargreaterextentthancoulddissolutionof44µmparticles(notfasterbuttoapotentiallygreatermassdissolved).ConclusionMariniteboardusedasasurrogateforMariniteparticulatewillhavetotalsurfacearea50%ofthetotalsurfaceareaofthenumberof44µmsphericalparticlescalculatedtobeproducedforeachbreak(50%isbasedonthesurfaceroughnesscomputationabove).Fortheexamplepresentedabove,thesurfaceareatobeusedinachemicaleffectstestwouldbe0.50x401.6m2=200.8m2scaledtothevolumeofthetestfluid.References1) CCNPPCalculationCA06940Rev.0001,"ComputationofAluminumandMariniteBoardDebrisLoads",March23,2009.2) Attachment3toAEPNRC:805402,NRCAccessionNumberML080770395.3) FaxfromNormanR.Scheffer,ProductDevelopment,BNZMaterials,toGilbertZigler,ENERCON,dated09/13/2013(Attached).

AttachmentFaxfromNormanR.Scheffer,ProductDevelopment,BNZMaterials,toGilbertZigler,ENERCON,dated09/13/2013