作者:标准资料网 时间:2024-05-03 18:22:24   浏览:8562   来源:标准资料网

【英文标准名称】:Nuclearenergy-Soxhlet-modechemicaldurabilitytest-Applicationtovitrifiedmatrixesforhigh-levelradioactivewaste
【原文标准名称】:核能.索格利特式耐化学试验.高放射性废弃物用陶瓷容器的应用
【标准号】:ISO16797-2004
【标准状态】:现行
【国别】:国际
【发布日期】:2004-04
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC85
【标准类型】:()
【标准水平】:()
【中文主题词】:核燃料;化学分析和试验;放射性废物;储存时间;索格利特(提取器);储存;处理;裂变材料;耐用试验;核能;超纯净水;搬运;放射性;核电站;安全要求;定义
【英文主题词】:
【摘要】:ThisInternationalStandarddescribestheSoxhlet-modeparametertesttoassessthechemicaldurabilityofmaterialsbymeasuringtheinitialdissolutionrateinpurewater.Themeasurementisperformedattheboilingpointofwater,atwhichthedissolutionrateisconsiderablyhigherthanatroomtemperature.Inmostcases,thealterationphenomenaarethereforesignificantlyaccelerated.ThetestdescribedinthisInternationalStandardisintendedtomeasuretheinitialdissolutionrate;itisthusapplicableonlytononporousmaterials(ormaterialswithsmall,closedporosity)forwhichtheprimaryalterationphenomenonisasurfacereactionmechanism(diffusionmechanismsareinvolvedinthedissolutionofporousmedia).Thetestresultscanthereforebecomparedonlywithfindingsobtainedfornonporousmaterialsifseriouserrorsofinterpretationaretobeavoided.Theresulting"initialdissolutionrateinpureboilingwateratatmosphericpressure"canbeusedtocomparematerialsofthesametype(e.g.oxides),providedtheirinitialdissolutionisgovernedbythesamemechanism(e.g.surfacereactions).Thisparametertestcannotbeusedtoassessthelong-termbehaviourofamaterial,whichgenerallyrequiresseveraltests,modellingandvalidation,asdescribed,forexample,inStandardENV12920.Thistestisapplicabletoanyglass,vitrifiedmaterial(i.e.materialresultingfromavitrificationprocess)ornonporousoxidematerialwithamorphologythatallowsthepreparationofmonolithictestcouponsofknownsurfacearea.Itdeterminestheinitialdissolutionrateofthematerialindeionizedwaterattheboilingpoint(approximately100℃)byanalysisoftheleachingsolutionandbymeasurementofthespecimenmassloss.
【中国标准分类号】:F80
【国际标准分类号】:13_030_30;27_120_99
【页数】:10P;A4
【正文语种】:英语