ML18012A721

NRC Jan 2018 Performance Demonstration for CASS

ML18012A721
Person / Time
Issue date:	01/12/2018
From:	Ali Rezai NRC/NRR/DMLR/MPHB
To:
Rezai A, NRR-DMLR 415-1328
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Download: ML18012A721 (4)

Text

PerformanceDemonstrationfor CastAusteniticStainlessSteel StephenCumblidgeandJayCollins NRC/IndustryNDETechnical InformationExchangeMeeting January1618,2018

NeedforImprovedInspections

• Currently,therearedissimilarmetalwelds coveredunderN7701thatcannotbefully inspectedbecauseofCASScomponents

• TheseweldsareaffectedbyPWSCC,anactive degradationmechanism

• AsstatedinASMECodeSectionXIuptothe 2013Edition,Castmaterialsmaypreclude meaningfulexaminationsbecauseof geometryandattenuationvariables.

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ConditiononDissimilarMetalWelds

• (11)CastStainlessSteel:ExaminationofASME CodeClass1pipingandvesselnozzlebuttwelds involvingcaststainlesssteelmaterials,shallbe performedwithAppendixVIII,Supplement9 qualifications,orqualificationssimilarto AppendixVIII,Supplement2or10usingcast stainlesssteelmockupsnolaterthanthenext scheduledweldexaminationstartingafter January 1,2022inaccordancewiththe requirementsofparagraph2500(a).

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Discussion 4