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【英文标准名称】:StandardTestMethodforNondestructiveAssayofNuclearMaterialinScrapandWastebyPassive-ActiveNeutronCountingUsing252CfShuffler
【原文标准名称】:使用a252Cf的被动-主动中子计数法在碎片和废料中作核材料无损检定的标准试验方法
【标准号】:ASTMC1316-2008
【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】:C26.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:activeneutronmeasurements;californium;californium-252;NDA;neutroncoincidencecounting;PAN;passiveneutronmeasurements;plutonium;scrapmeasurements;shuffler;uranium;wastemeasurements;Nondestructiveevaluation(NDE)--nuclearapplic
【摘要】:ThistestmethodisusedtodeterminetheUandPucontentofscrapandwasteincontainers.Activemeasurementtimeshavetypicallybeen100to1000s.Passivemeasurementtimeshavetypicallybeen400stoseveralhours.Thefollowinglimitsmaybefurtherrestricteddependinguponspecificmatrix,calibrationmaterial,criticalitysafety,orcountingequipmentconsiderations.Thepassivemeasurementhasbeenappliedtobenignmatricesin208LdrumswithPucontentrangingfrom30mgto1kg.Theactivemeasurementhasbeenappliedtowastedrumswith235Ucontentrangingfromabout100mgto1kg.Thistestmethodcanbeusedtodemonstratecompliancewiththeradioactivitylevelsspecifiedinsafeguards,waste,disposal,andenvironmentalregulations(forexample,seeNRCregulatoryguides5.11,5.53,DOEOrder5820.2a,and10CFR61sections61.55andsections61.56,40CFR191,andDOE/WIPP-069).Thistestmethodcouldbeusedtodetectdiversionattemptsthatuseshieldingtoencapsulatenuclearmaterial.Thebiasofthemeasurementresultsisrelatedtotheitemsizeanddensity,thehomogeneityandcompositionofthematrix,andthequantityanddistributionofthenuclearmaterial.Theprecisionofthemeasurementresultsisrelatedtothequantityofnuclearmaterialandthecounttimeofthemeasurement.Forboththematrix-specificandthematrix-correctionapproaches,themethodassumesthecalibrationmaterialsmatchtheitemstobemeasuredwithrespecttothehomogeneityandcompositionofthematrix,theneutronmoderatorandabsorbercontent,andthequantityofnuclearmaterial,totheextenttheyaffectthemeasurement.Itisrecommendedthatmeasurementsbemadeonsmallcontainersofscrapandwastebeforetheyarecombinedinlargecontainers.Specialarrangementmayberequiredtoassaysmallcontainerstobesteffectinalargecavitygeneralpurposeshuffer.Itisrecommendedthatmeasurementsbemadeoncontainerswithhomogeneouscontents.Ingeneral,heterogeneityinthedistributionofnuclearmaterial,neutronmoderators,andneutronabsorbershasthepotentialtocausebiasedresults.Thistestmethodrequiresthattherelativeisotopiccompositionsofthecontributingelementsareknown.Thistestmethodassumesthatthedistributionofthecontributingisotopesisuniformthroughoutthecontainerwhenthematrixaffectsneutrontransport.Thistestmethodassumesthatlumpaffectsareunimportantx2014;thatistosaythatlargequantitiesofspecialnuclearmaterialarenotconcentratedinasmallportionofthecontainer.Forbestresultsfromtheapplicationofthistestmethod,appropriatepackagingoftheitemsisrequired.Suitabletrainingofthepersonnelwhopackagethescrapandwastepriortomeasurementshouldbeprovided(forexample,seeANSI15.20,GuideC1009,GuideC1490,andGuideC1068fortrainingguidance).Sometimessitespecificconditionsandrequirementsmayhavegreaterbearing.1.1ThistestmethodcoversthenondestructiveassayofscrapandwasteitemsforU,Pu,orboth,usinga252Cfshuffler.Shufflermeasurementshavebeenappliedtoavarietyofmatrixmaterialsincontainersofuptoseveral100L.Correctionsaremadefortheeffectsofmatrixmaterial.Applicationsofthistestmethodincludemeasurementsforsafeguards,accountability,TRU,andUwastesegregation,disposal,andprocesscontrolpurposes(1,2,3).1.1.1Thistestmethodusespassiveneutroncoincidencecounting(4)tomeasurethe240Pu-effectivemass.IthasbeenusedtoassayitemswithtotalPucontentsbetween0.03gand1000g.Itcouldbeusedtomeasureother......
【中国标准分类号】:F46
【国际标准分类号】:
【页数】:17P.;A4
【正文语种】:英语