Corrosion analysis of displacement measurement system for nuclear power plant containment with invar steel wire material
To address the issues of corrosion and fracture of the monitoring wires in the containment shell displace-ment measurement system of a certain nuclear power plant,it is urgently necessary to select a suitable monitoring wire for on-site use.To achieve this,first establishes experimental environmental parameters based on statistical da-ta from the on-site environment of the nuclear power plant and reference standards.Secondly,experimental materi-als and methods are determined through literature review and practical investigation:a salt spray accelerated corro-sion aging test was developed for four types of nickel-iron alloy(Invar)wires(4J29,4J32,4J36,S4J32A),stain-less steel,and TM-V221 bisphenol a epoxy pultruded resin(carbon fiber),aiming to assess the corrosion condition,corrosion resistance,quality changes,and mechanical property variations of different types of monitoring wires.The test results indicate that the corrosion condition and corrosion resistance of stainless steel and carbon fiber materials are superior to those of Invar materials.The degree of corrosion in Invar materials ranges from slight to severe,with the corrosion resistance time being longest for 4J29,followed by S4J32A,and then 4J36.Regarding maximum strength,tensile strength,and yield strength,the order from strongest to weakest is Invar materials 4J29 and 4J32,carbon fiber materials,stainless steel materials,and Invar materials 4J36 and S4J32A.
nuclear power plantdisplacement measurement systemsalt spray aging testcorrosion analysis
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