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燃料元件包壳的水侧腐蚀性能是PWR核电站提高燃耗的主要限制因素。为比较新锆合金与Zr-4的水侧腐蚀性能,进行了新锆合金堆外热流条件下的动水腐蚀实验。 由于热流对包壳材料的腐蚀性能影响很大,实验采用电加热模拟元件使样品表面产生热负荷。为了不破坏实验样品的表面状态,采用电热元件间接加热方式。该实验采用的电热元件间接加热方式的实验技术在国内尚属首次。由于元件的功率密度高,又采用间接加热方式,增加了元件制造的难度。在元件的设计制造中,采取了精确控制各部分尺寸,精心设计选择绝缘材料、加
Water-side corrosion of the cladding of fuel elements is a major limiting factor in improving fuel economy at PWR plants. In order to compare the corrosion behavior of Zr-4 with that of Zr-4, a hydrodynamic corrosion test was carried out under the condition of external heat flow of the new zirconium alloy. Due to the influence of heat flow on the corrosion properties of the cladding material, the electrical heating simulation element is used to generate thermal load on the sample surface. In order not to damage the surface of the experimental sample state, the use of electric heating element indirectly. The experiment uses the indirect heating method of electric heating element experimental technology is the first time in China. Due to the high power density of the device, indirect heating is also used, which increases the difficulty of device manufacturing. In the design and manufacture of components, take the precise control of the size of each part, carefully designed selection of insulating materials, plus