核设施烟囱气态流出物取样系统气溶胶穿透效率试验研究

Experimental research on aerosol penetration efficiency of gaseous effluents from stack sampling system in nuclear power plant

核设施烟囱气态流出物的取样是否具有代表性,将直接影响流出物测量的准确性。气溶胶穿透效率是取样代表性的关键指标之一。本文介绍了取样系统气溶胶穿透效率的试验方法和试验要求,针对国内某在建核电站,开展了D a=10μm粒径下的穿透效率验证试验,其结果为48.42%;三级取样管线取消弯头,采用直管连接,通过此改进后取样管路的穿透效率提升至53.21%,满足标准中大于50%的要求。

It will directly affect the accuracy of the effluents measurement that whether the sampling from the stack in nuclear facility is representative.Aerosol penetration efficiency is one of the key indicators of sampling representativeness.The method and requirements of aerosol penetration efficiency experiment in sampling system is introduced in this article.The penetration efficiency test with a particle size of D a=10μm was carried out for a nuclear power station under construction in China,and the result was 48.42%.The penetration efficiency increased to 53.21%after improving the sampling pipeline,greater than 50%,which meets the requirement of the relevant standard.