Title of article
SeismiccapacityevaluationofagroupofverticalU-tubeheatexchangerwithsupportframesforseismicPSAOriginalResearchArticle
Author/Authors
YuichiWatanabe، نويسنده , , KenMuramatsu، نويسنده , , TetsukuniOikawa، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2005
Pages
18
From page
2495
To page
2512
Abstract
ThispaperpresentsanevaluationofseismiccapacityofagroupofverticalU-tubetypeheatexchangers(HXs)withsupportframestocontributetorefinementofseismiccapacitydataforseismicProbabilisticSafetyAssessment(PSA)inJapan.AccordingtousualpracticeofseismicPSAs,capacityofcomponentisrepresentedasalog-normallydistributedrandomvariabledefinedbyamedianandlogarithmicstandarddeviations(LSDs),whichrepresentinherentrandomnessaboutthemedian,βr,anduncertaintyinthemedianduetolackofknowledge,βu.UsingdesignspecificationsoffourHXsforresidualheatremovalsystemsof1100MWeBWRs,theauthorsevaluatedagenericcapacityofHXswithaLSDforuncertaintyduetolackofknowledgetotakeintoaccountdesignvariability.ThemediancapacitywasevaluatedbytheuseofatimehistoryresponseanalysiswithadetailedmodelforaselectedrepresentativeHX,whichwasextendedfromamodelusedinseismicdesign.TheLSDforuncertaintyduetolackofknowledgewasevaluatedwithconsiderationofthevariabilitiesinthreeinfluentialdesignparameters,i.e.,diameterofanchorbolt,weightofHXandpositionofcenterofgravityofHXwiththedetailedmodelandasimplifiedstaticmodel.TheLSDforuncertaintyduetorandomnesswasdeterminedfromthevariabilityinmaterialproperty.ThedominantfailuremodeofHXswasidentifiedasthefailureofanchorboltsoflugsmainlyduetoshearingstress.ThecapacityexpressedintermsofzeroperiodaccelerationonthefoundationofHXwasevaluatedtobe4180Gal(4.3g)formedian,LSDforuncertaintyduetorandomnesswas0.11andLSDduetolackofknowledgewas0.21–0.53dependingoncombinationofthevariabilitiesindesignparameterstobeconsidered.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2005
Journal title
Nuclear Engineering and Design Eslah
Record number
895959
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