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研究了包壳与燃料裂变产物的化学相互作用(FCCI),建立了模拟试验所需的两套试验设备——制备含模拟裂变产物包壳管样品用的惰性气体循环净化手套箱系统和等温模拟试验用的高温试验炉及其温度自动控制监测系统。对国内三个单位研制的钠冷堆不锈钢包壳管进行了FCCI堆外模拟试验。用光学显微镜、扫描电镜和能谱仪对23组(共69根样品)包壳管的FCCI特征进行了观测分析,对26组(共78根样品)包壳管FCCI前后的室温爆破强度和周向延伸率作了测试比较,并分析了断口形貌。
The chemical interaction between cladding and fuel fission products (FCCI) was studied. Two sets of testing equipment needed to simulate the experiment were established. The system of inert gas circulation cleaning glove box used to prepare the simulated fission product cladding tubes and isothermal simulation Test high temperature test furnace and automatic temperature monitoring system. The FCCI reactor simulation test was conducted on the sodium-cooled reactor stainless steel cladding tubes developed by three domestic units. The FCCI characteristics of the cladding tubes of 23 groups (69 samples in total) were observed and analyzed by optical microscope, scanning electron microscope and energy dispersive spectroscopy. The burst strength at room temperature before and after FCCI of 26 groups (total 78 samples) The elongation was tested and compared, and the fracture surface morphology was analyzed.