ML16172A019

STP Aluminum Bronze Selective Leaching Public Meeting - June 21, 2016

ML16172A019
Person / Time
Site:	South Texas
Issue date:	07/25/2016
From:	Division of License Renewal
To:
james l m
References
CAC ME4936, CAC ME4937
Download: ML16172A019 (18)

Text

STPAluminumBronze PublicMeeting StaffQuestionsonAMP June21,2016 18

Introduction

• Thispresentationsummarizes comments/questionsonAMPB2.1.37, SelectiveLeachingofAluminumBronze.

• Comments/questionsareorganizedin accordancewiththeStandardReviewPlanfor LicenseRenewal,AppendixA.1.2.3,Aging ManagementProgramElements.

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ScopeofProgram Programstatesthatextrudedteeswithweldrepairs willbereplacedifitisdeterminedthat"therepairsize issuchthatfailureoftherepairwouldaffectstructural integrityofthecomponent."

• Duringtheaudit,theapplicantstatedthatweld repairsizewasnot knownforalloftheaffected tees.

• Staffneedstounderstandhowthestructural determinationwillbemadeintheabsenceofthis detail.

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PreventiveActions

• Documentwhichportionsoftheburied essentialcoolingwatersystemarecoated.

• Citethecoatingasapreventiveaction-or citesoilasanapplicableenvironment.

• Thestatementsonaluminumbronzecastings andextrudedpipingteesneednotbe repeatedinthisprogramelement.

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ParametersMonitoredorInspected

• TheAMPshouldconsistentlycitethefollowingparameters:

- Lossofmaterial(agingeffect)[sometimesreferredtoas selectiveleachinginAMP]

- Cracking(agingeffect)

- Phasedistribution(indirectmeasureofthepotentialfor continuousdealloying)

• 4th paragraphstatesthatOEhasshownthatcertainweldsare notsusceptibletocrackingcausedbyselectiveleaching.

- OEonlydemonstratesthattherearenothroughwall indications 18

DetectionofAgingEffects Buriedpipeinspectionswhenpipeisexposed:

• Whatisthemethodofinspection?

• Istheinspectionconductedoninternal, external,orbothsurfaces?

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DetectionofAgingEffects cont.

WeldwithNoBackingRings Staffbelievesthatvolumetricinspectionsshoulddemonstratenocracking accompaniedbydealloying.

Volumetricinspections,onetimeinspectionof3%oftheweldswitha maximumof10welds.

- AMPXI.M32,OneTimeInspection,recommends20%witha maximumof25.PriortoPEO.

- QuantityisinconsistentwithGALLReportrecommendations.

Programstatesthat,[i]frejectableweldflaws,aredetected,inspections willbecomeperiodicinlieuofonetime.

- Howmanyweldflawswillittaketotransitiontoperiodicinlieuof onetimeinspections?

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DetectionofAgingEffects cont.

WeldwithBackingRings

• Staffbelievesthatvolumetricinspectionsshoulddemonstrate nocrackingaccompaniedbydealloying.

• Periodicinspectionof20%oftheweldswithamaximumof25 welds

• Programstates,ifnowelddefectsarefoundthenumberof inspectionswillbereducedto3%withamaximumof10 welds.

- Howmanyweldflawswillittaketonottransitiontothe reducednumberofinspections?

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DetectionofAgingEffects cont.

DestructiveExaminations Staffbelievesthatexaminationsaretodemonstrate:

- forweldswithoutbackingrings,nolossofmaterialduetouniformor pluglikedealloying,aphasedistributionthatsupportsthebasis document,andnocrackingaccompaniedwithdealloying

- forweldswithbackingrings,nolossofmaterialduetouniformorplug likedealloying,aphasedistributionthatsupportsthebasisdocument,and thefrequencyofoccurrenceofcrackingaccompaniedwithdealloying Theprogramstatesthattwoweldswithbackingringswillbedestructively examined.

- AMPXI.M32recommends20%withamaximumof25.

Staffbelievesthatweldswithbackingringsandweldswithoutbackingrings aretwoseparatepopulations

- Backingrings-creviceforselectiveleaching

- Withoutbackingrings-lessdilutionandlongercoolingperiodinroot weld 18

DetectionofAgingEffects cont.

InspectionLocations Programstatesthatinspectionlocationswillberandomlyselected.

Staffbelievesthatinspectionlocationscanberandom.

Locationsshouldberepresentativeofrangeandquantityofweld sizes.

InspectionTiming Programisnotclearonwhetheronetimeinspectionsoccurpriorto PEO.

Periodicinspectionof20%oftheweldswithamaximumof25 weldsifrejectableweldflaws.aredetected.

- Performedevery10yearsthereafter.

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MonitoringandTrending

• Thestaffrecognizesthatquantitativeresultswill notbeobtainedbytheplannedvolumetricand destructiveinspections/examinations.

• Withouttrending,inspectionresultswouldbe buriedinthecorrectiveactionprogram.

• Thestaffneedstounderstandwhytheresultsof thevolumetricanddestructiveinspectionswill notbecompiled(trended)andthecompiled resultsevaluated.

• Thestaffneedstounderstandwhytheresultsof thewalkdownswillnotbetrended.

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AcceptanceCriteria TheAMPstatesthattheacceptancecriteriaforweldsisnodefects:

A/Cforvolumetricexaminationsis,nodefects.

Parametersmonitoredorinspectedprogramelementstates,Ifrejectable weldflaws(welddefects)perASMESectionIX.

- Programisunclearinthatitaddressesflawsanddefects.

- WhyisSectionIXcited?

- CitingSectionIIIcouldleadtononconsequential(fordealloying) defects(e.g.,concavitywithweldsizeslightlyunderthickness (suckback),roundedindications>5/32,inadequatepenetration).

- CitingSectionIIIcouldleadtoanalyticalresolutionthatadefectis classifiedasaflaw.

Describethespecificcriteriafordeclaringthatanindicationinaweldis rejectable.

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AcceptanceCriteria cont.

• Thereisnoacceptancecriteriaforthe destructiveexaminations.

• Whyistherenoacceptancecriteriaforthe detectionofpluglikeoruniformdealloying?

• Whyistherenoacceptancecriteriaforburied pipecoatings?

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CorrectiveActions ExpansionofExaminations AMPstatesthateachweldfoundtohavedefectswillresultinfive additionalvolumetricexaminationsuntilnoadditionalwelddefectsare detected.

Willexpansionofinspectionsbeconductedifabovegroundleaksare detected?

- Leaksshouldnotbedetectedoncecastingsarereplaced,regardlessof theuseofbackingrings.

- Whattypeofexpandedinspectionwillbeconductedifleaksare detected(e.g.,volumetric,destructive).

Whatcorrectiveactionswilloccurifdealloyingisdetectedinwelds withoutbackingrings?

Forweldswithbackingrings,whatcorrectiveactionswilloccurdepending onthefrequencyofoccurrenceofcrackingaccompaniedwithdealloying?

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CorrectiveActions cont.

ExpansionofExaminations

• AMPstatesthatifburiedpipeleakisdetected,asectionof eachleakingpipeweldwillberemovedfordestructive examination.

- Willanexpansionofinspectionsbeconducted?

• Willexpansionofdestructiveexaminationsbeconductedif acceptancecriteriafordestructiveexaminationsisnotmet?

• Correctiveactionsforthedetectionofpluglikeoruniform dealloying?

• Correctiveactionsforburiedpipecoatingdefects?

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BasisDocument

• ,page54,Table12

- Whyisthe30inch,dischargesidetee(withamarginof1.01of allowablelengthtoleaklength)acceptableforserviceinthePEO?

• ,page53,Table11

- Walkthroughhowthistablewasdeveloped.

- Whywastheunintensifiedbendingstressused?

• ,Table1

- ReviewinstancesofOEwhereindicationswere:

• nearandparalleltothebuttweldpage21

• alongalineontheflangenecknearthebuttweldpage22

• nearthebuttweldpage23 18

EditorialComments Theperiodicwalkdownofabovegroundweldlocationsshouldbecitedin theparametersmonitoredorinspectedprogramelement.

Theperiodicwalkdownofyardareastodetectburiedpipeleaksshouldbe citedintheparametersmonitoredorinspectedprogramelement.

Programstatesthattheenvironmentisrawwater;however,soilshould alsobecited,unlesscoatingscredited.

Firstenhancementstatesthataluminumbronzecastingswillbereplaced; however,itisdoesnotstatethatthereplacementmaterialwillnotbe susceptibletoselectiveleaching.

Correctiveactionsprogramstates,leakfromaburiedpipeweld.It shouldbemadeclearthattheweldcouldbe:(a)tononsusceptiblepipe, (b)tosusceptiblecastcomponents,or(c)therepairweldinanextruded tee.ThisshouldbemadeclearthroughouttheAMP.

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Summary/Wrapup 18