The development of accident tolerant fuel (ATF) tominimize the impact of nuclear accident has beenperformed competing globally over the past several years.The researchers at KAERI selected the concepts of coatedcladding as the primary target considering theapplicability of the ATF cladding, economical efficiency,and compatibility with existing facilities. Therefore, thecladding concept of ATF cladding which is mainlyperformed in KAERI is to coat new oxidation materials onZr alloy cladding among various technologies. Thecoating material was Cr-10Al alloy, and the coatingmethod was arc ion plating (AIP). The performanceevaluation of the coated cladding was carried out undernormal operating conditions (corrosion, creep), accidentconditions (oxidation, ballooning-rupture), and researchreactor test (corrosion, irradiation stability). Ring tensiletest and wear test at room temperature were alsoperformed to confirm the integrity of the coating layer.The CrAl-coated cladding had very good corrosionresistance without damaging the coating layer in anormal corrosion environment. The creep resistance ofCrAl-coated cladding was also improved compared to theuncoated cladding. The CrAl-coated cladding was foundto have significantly improved high temperature oxidationresistance and somewhat improved deformationresistance compared to the uncoated cladding. The resultsof the research reactor tests in Halden show that theCrAl-coated cladding has excellent corrosion resistanceand no damage. Based in these results, optimizationstudies are carried out for coating process andcomposition control of CrAl-coated cladding. In addition,the CrAl-coated cladding developed at KAERI iscurrently preparing coating equipment for claddingmanufacturing of actual specifications.
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