氩气回路中杂质CO的在线分析方法

On-line analysis of impurities CO in loop of argon

模拟正在建造的中国实验快中子反应堆的气体回路,建立了一个工程上可行的、有多条固定管线和阀门的50 m长快堆覆盖气体放射性氩气取样系统、计算机控制的阀门进样以及氩气中杂质CO的间断性在线分析方法.通过热导检测器出口气体可以排放入通风系统的办法,避免了使用氢火焰离子化检测器以后,放射性气体氩气扩散排放到气体分析实验室产生工作环境的放射性污染问题.其检测限、测量精度和准确度满足了中国实验快堆规定的氩气中杂质CO的分析要求,并达到了美国试验和材料协会(ASTM)在快堆覆盖气体杂质的标准中提出的分析氩气中杂质CO的标准要求.

A gas loop is being constructed in a fast neutron reactor and represents a feasible method in engineering to realize a discontinuous on-line analysis for determining CO in cover gas systems of radioactive argon by using a gas chromatography and a multiple-pipeline sampling system which has a 50 m distance, and a valve sampling system by using computer. The method that the gas from thermal conductivity detectors emits to vent system directly can avoid radioactive argon emission to gas-analytical experiment laboratory, where it causes radioactive contamination in work environment by using a flame ionization detector. Its detection limit, determining precision and degree of accuracy satisfies the demand of analyzing impurities CO in argon for China CEFR reactor. Its detection limit arrives at a standard of ASTM （American Society for Testing and Materials） too. It is a standard for analyzing CO in cover gas argon for fast neutron reactor.