Designation:C1346−08(Reapproved2014)StandardPracticeforDissolutionofUF6fromP-10Tubes1,2ThisstandardisissuedunderthefixeddesignationC1346;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticecoversthedissolutionofUF6fromaP-10tubetoprovidesolutionsforanalysis.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificsafeguardandsafetyprecautionstatements,seeSection8.2.ReferencedDocuments2.1ASTMStandards:3C761TestMethodsforChemical,MassSpectrometric,Spectrochemical,Nuclear,andRadiochemicalAnalysisofUraniumHexafluorideC787SpecificationforUraniumHexafluorideforEnrich-mentC996SpecificationforUraniumHexafluorideEnrichedtoLessThan5%235UD1193SpecificationforReagentWater3.SummaryofPractice3.1UF6samplesintendedforanalysisarepackagedinP-10tubestopreventsublimationandreactionwithmoistureintheair.TheP-10tubeassembly(Fig.1)consistsofaPolychloro-trifluoroethylene(PCTFE)tubecontainingtheUF6,aPCTFEgaskettocoverthetube’sopening,andanutandplug(MonelorSS)tosealthegaskettothetube.3.2TheUF6tubeisweighed,cooledinliquidnitrogen,andquicklyopenedandimmersedinwaterfordissolution.Thepiecesofthetube’sassemblyareremovedfromtheresultingsolution,rinsed,dried,reassembled,andweighed.ThesolutionisdriedforgravimetricconversiontoU3O8,ordilutedtoanappropriateconcentrationfordispensingintoaliquotsforsubsequentanalysis.4.SignificanceandUse4.1Uraniumhexafluorideisabasicmaterialusedtopreparenuclearreactorfuel.Tobesuitableforthispurposethematerialmustmeetcriteriaforuraniumcontent,isotopic...
