管道外非介入式监测核设施液态流出物模拟研究

Study on Non Intrusive Liquid Effluent Monitoring Method Outside the Pipeline

针对基于NaI探测器的管道外非介入式放射性流出物监测方法开展了系列研究。利用MC代码建立NaI探测器仿真模型,模拟计算NaI探测器与被测管道不同耦合测量方式,以及NaI探测器对于三种不同规格尺寸的管道内放射性废水的活度浓度响应。利用标准活度浓度^(137)Cs放射性溶液对液态流出物监测仪实物样机进行了测试实验,实验结果与模拟结果具有较好的一致性。

The on-line monitoring technology of non-invasive radioactive wastewater outside the pipeline is an effective means of wastewater discharge control of nuclear facilities.In this paper,a series of research work has been carried out on the non intrusive radioactive effluent monitoring method outside the pipeline based on Nal detector.First,the simulation model of Nal detector is established by Monte Carlo code;After that,on the basis of ensuring the accurate modeling of the detector,simulate and calculate the activity concentration response of the Nal detector to the radioactive wastewater in the pipeline under different coupling measurement modes of the Nal detector and the pipeline under test and under the conditions of the Nal detector for three different sizes of the pipeline under test.Finally,the prototype of the liquid efluent monitor was tested by using the standard activity concentration^(137)Cs radioactive solution,and the experimental results were in good agreement with the simulation results.