简介：Inthisstudy,commercialpolyvinylchloride(PVC)filmsweretreatedbyoxygenandargonplasmasinacylindricalglasstubewhichwassurroundedbyaDCvariablemagneticfield,withdifferentsamplepositionsintheplasmareactorandalsodifferentexposuredurations.Effectsoftheplasmatreatmentonthehydrophilicpropertiesofthefilmswerestudiedbymeasuringthewaterdropcontactangleonthesurfaceofthesamples.Thesurfacetopographyoftheuntreatedandplasmatreatedfilmswasanalyzedandcomparedbyatomicforcemicroscopy(AFM).Theopticalcharacteristicchangesintreatedsampleswereinvestigatedusingreflectivespectrophotometry.Also,thechemicalchangeswhichappearedonthesurfaceofthesampleswereinvestigatedusingFouriertransforminfraredspectroscopy(FTIR).TheresultsshowthattheplasmatreatedPVCbecomesmorehydrophilicwithanenhancedwettability.Asharpdecreaseinthewatercontactanglemayalsobeaconsequenceofthesurfacetexturization.Theagingeffectonwettabilityofthesampleswasalsoinvestigated.Theresultsshowthattheeffectofoxygenplasmaonthesurfacepropertiesofthesamplesismorepronouncedcomparedwiththatofargonplasma.

简介：针对内部水淹的防护,传统的确定论安全评价是从维持安全功能的角度定性分析内部水淹对机组核安全的影响,无法给出定量的风险评价。而核电厂风险指引型管理是以确定论分析为基础,利用概率安全评价的分析结果进行风险影响评价,以此来论证决策的合理性和必要性。本文基于田湾核电厂3、4号机组内部水淹概率安全评价分析结果,针对内部水淹风险贡献最大的汽轮机厂房循环水母管破裂的水淹情景,提出了3种设计改进方案,然后通过对各种改进方案进行了对比研究和评估,给出3种改进方案的优缺点及实施后对内部水淹堆芯损坏频率的影响,并给出了推荐的设计改进建议。