【英文标准名称】:StandardTestMethodforApplicationandAnalysisofSolidStateTrackRecorder(SSTR)MonitorsforReactorSurveillance,E706(IIIB)
【原文标准名称】:反应堆监测用固态径迹记录仪(SSTR)监视器的应用和分析的标准试验方法,E706(IIIB)
【标准号】:ASTME854-2003(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【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】:E10.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:dosimetry;fissiondeposit;monitor;PWR;SSTR;surveillance;trackcounting;Dosimetry;Fastneutronflux/fluence;Fluence;Neutronflux/fluence;Nuclearreactorvessels--light-watercooled;Nuclearreactorvessels--surveillance;Radiationexposure--nucl
【摘要】:TheSSTRmethodprovidesforthemeasurementofabsolute-fissiondensityperunitmass.Absolute-neutronfluencecanthenbeinferredfromtheseSSTR-basedabsolutefissionrateobservationsifanappropriateneutronspectrumaveragefissioncrosssectionisknown.Thismethodishighlydiscriminatoryagainstothercomponentsofthein-coreradiationfield.Gammarays,betarays,andotherlightlyionizingparticlesdonotproduceobservabletracksinappropriateLWRSSTRcandidatematerials.However,photofissioncancontributetotheobservedfissiontrackdensityandshouldthereforebeaccountedforwhennonnegligible.Foramoredetaileddiscussionofphotofissioneffects,see13.4.Inthistestmethod,SSTRareplacedinsurfacecontactwithfissionabledepositsandrecordneutron-inducedfissionfragments.Byvariationofthesurfacemassdensity(x03BC;g/cm2)ofthefissionabledepositaswellasemployingtheallowablerangeoftrackdensities(fromroughly1event/cm2upto105events/cm2formanualscanning),arangeoftotalfluencesensitivitycoveringatleast16ordersofmagnitudeispossible,fromroughly102n/cm2upto5x00D7;1018n/cm2.Theallowablerangeoffissiontrackdensitiesisbroaderthanthetrackdensityrangeforhighaccuracymanualscanningworkwithopticalmicroscopycitedin1.2.Inparticular,automatedandsemi-automatedmethodsexistthatbroadenthecustomarytrackdensityrangeavailablewithmanualopticalmicroscopy.Inthisbroadertrackdensityregion,effectsofreducedcountingstatisticsatverylowtrackdensitiesandtrackpile-upcorrectionsatveryhightrackdensitiescanpresentinherentlimitationsforworkofhighaccuracy.AutomatedscanningtechniquesaredescribedinSection11.Fordosimetryapplications,differentenergyregionsoftheneutronspectrumcanbeselectivelyemphasizedbychangingthenuclideusedforthefissiondeposit.ItispossibletouseSSTRdirectlyforneutrondosimetryasdescribedin4.1ortoobtainacompositeneutrondetectionefficiencybyexposureinabenchmarkneutronfield.Thefluenceandspectrum-averagedcrosssectioninthisbenchmarkfieldmustbeknown.Furthermore,applicationinotherneutronfieldsmayrequireadjustmentsduetospectraldeviationfromthebenchmarkfieldspectrumusedforcalibration.Inanyevent,itmustbestressedthattheSSTR-fissiondensitymeasurementscanbecarriedoutcompletelyindependentofanycross-sectionstandards(6).Therefore,forcertainapplications,theindependentnatureofthistestmethodshouldnotbecompromised.Ontheotherhand,manypracticalapplicationsexistwhereinthisfactorisofnoconsequencesothatbenchmarkfieldcalibrationwouldbeentirelyappropriate.1.1Thistestmethoddescribestheuseofsolid-statetrackrecorders(SSTRs)forneutrondosimetryinlight-waterreactor(LWR)applications.Theseapplicationsextendfromlowneutronfluencetohighneutronfluence,includinghighpowerpressurevesselsurveillanceandtestreactorirradiationsaswellaslowpowerbenchmarkfieldmeasurement.(1)ThistestmethodreplacesMethodE418.Thistestmethodismoredetailedandspecialattentionisgiventotheuseofstate-of-the-artmanualandautomatedtrackcountingmethodstoattainhighabsoluteaccuracies.In-situdosimetryinactualhighfluence-hightemperatureLWRapplicationsisemphasized.1.2ThistestmethodincludesSSTRanalysisbybothmanualandautomatedmethods.Toattainadesiredaccuracy,thetrackscanningmethodselectedplaceslimitsontheallowabletrackdensity.Typicallygoodresultsareobtainedintherangeof5to......
【中国标准分类号】:F82
【国际标准分类号】:27_120_20
【页数】:16P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 双线自动闭塞电气集中联锁(设信号员)接发列车作业标准 |
| 中标分类： |
铁路 >>
铁路信号 >>
车站联锁 |
| 替代情况： | TB 1500-84;被TB/T 1500-2003代替 |
| 发布日期： | |
| 实施日期： | 1992-11-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 12页 |
适用范围
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前言
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所属分类： 铁路 铁路信号 车站联锁