冷却剂产生的结垢可增大元件棒表面的热阻,加剧腐蚀,甚至造成流道阻塞,妨碍核电厂的安全运行,因此,需要对水垢进行物相分析,找出原因,设法预防。考验元件经25000MWd/t(U)燃耗辐照后,单棒已具有117Ci的放射性,其表面水垢的放射性也很强。因此,水垢的取样、制样与分析工作都十分困难。为此,我们设 Scaling generated by the coolant can increase the thermal resistance of the rod surface, exacerbate corrosion and even block the runner and prevent the safe operation of the nuclear power plant. Therefore, phase analysis of the scale is needed to find out the cause and try to prevent it. After the test element has been irradiated with a fuel consumption of 25000MWd / t (U), the single rod already has 117Ci radioactivity and its surface scale is also highly radioactive. Therefore, the scale sampling, sample preparation and analysis are very difficult. To this end, we set