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【英文标准名称】:StandardPracticeforSamplingofGaseousUraniumHexafluoride
【原文标准名称】:气态六氟化铀采样的标准方法
【标准号】:ASTMC1703-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:C26.02
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:bulksampling;nuclearmaterial;uraniumhexafluoride
【摘要】:Uraniumhexafluorideisnormallyproducedandhandledinlarge(typically1to14-ton)quantitiesandmust,therefore,becharacterizedbyreferencetorepresentativesamples(seeISO/DIS7195).ThesamplesareusedtodeterminecompliancewiththeapplicablecommercialspecificationsC996andC787.Thequantitiesinvolved,physicalproperties,chemicalreactivity,andhazardousnatureofUF6aresuchthatforrepresentativesampling,speciallydesignedequipmentmustbeusedandoperatedinaccordancewiththemostcarefullycontrolledandstringentprocedures.ThispracticecanbeusedbyUF6converters,enrichers,andfuelfabricatorstoreviewtheeffectivenessofexistingproceduresorasaguidetothedesignofequipmentandproceduresforfutureuse.TheintentionofthispracticeistoavoidliquidUF6samplingoncethecylinderhasbeenfilled.Forsafetyreasons,manipulationoflargequantitiesofliquidUF6shouldbeavoidedwhenpossible.Itisemphasizedthatthispracticeisnotmeanttoaddressconventionalornuclearcriticalitysafetyissues.1.1Thispracticecoversmethodsforwithdrawingrepresentativesample(s)ofuraniumhexafluoride(UF6)duringatransferoccurringinthegasphase.Suchtransferinthegasphasecantakeplacefromamothercylinder,forexampleinanautoclavetoareceivingcylinder.Itcanalsooccurduringthefillinginthegasphaseofacylinderduringacontinuousproductionprocess,forexamplecentrifugeenrichmentfacilityorthedistillationcolumninaconversionfacility.Suchsample(s)maybeusedfordeterminingcompliancewiththeapplicablecommercialspecification,forexampleSpecificationC996orSpecificationC787.1.2SinceUF6samplingistakenduringthefillingprocess,thispracticedoesnotaddressanyspecialadditionalarrangementsthatmaybeagreeduponbetweenthebuyerandthesellerwhenthesampledbulkmaterialisbeingaddedtoresiduesalreadypresentinacontainer(x201C;heelsrecyclex201D;).SucharrangementswillbebasedonQAproceduressuchastraceabilityofcylinderorigin(topreventforexamplecontaminationwithirradiatedmaterial).1.3Ifthereceivingcylinderispurgedafterfillingandsampling,specialverificationsmustbeperformedbytheusertoverifytherepresentativityofthesample(s).Itisthenexpectedthattheresultsfoundonvolatileimpuritieswithgasphasesamplingmaybeconservative.1.4Thispracticeisonlyapplicablewhenthetransferoccursinthegasphase.Whenthetransferisperformedintheliquidphase,PracticeC1052shouldapply.Thispracticedoesnotapplytogassamplingafterthecylinderhasbeenfilledsincethesampletakenwillnotberepresentativeofthecylinder.1.5Thescopeofthispracticedoesnotincludeprovisionsforpreventingcriticalityincidents.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:F46
【国际标准分类号】:27_120_30
【页数】:5P.;A4
【正文语种】:英语