ISO 2889新、老标准混合均匀处取样代表性的数值分析研究

Numerical analysis and study on the representativeness of sampling at uniformly mixed place of new and old ISO 2889 standards

本文针对设计的核动力排放设施,按照ISO 2889—2010标准规定采用数值建模计算分析的方法对符合ISO 2889—1975混合均匀要求和“二八”原则设置的取样位置的代表性进行了评估研究。研究结果显示,除了基本流动满足要求外,以具有排放代表性的放射性碘核素评估的放射性气体与气溶胶的混合均匀性无法满足要求,表明不能直接使用老标准的定性混合均匀处替代新标准的混合均匀性定量的要求。本文同时使用程序和实验对结果做了验证,结果显示使用的Graphene计算程序较对比验证程序的一致性好,且这种方法更接近实验结果。研究方法和结果可为核能的安全排放控制及其法规执行提供重要参考与借鉴。

In order for the design of nuclear power emission facilities,the mixing uniformity which met the requirements of ISO 2889—1975 and“2∶8”principle was studied in this paper,by the method of modeling calculation in accordance with ISO 2889—2010 standards.The results show that only the basic flow characteristics as flow angel and velocity meet the requirements,but the mixing uniformity of emission representative radioiodine nuclide assessment in radioactive gas and aerosol could not meet the requirements.In order to ensure the reliability of the study,the results are verified by both simulation program and experiment.The results show that the Graphene calculation method used in this paper is in good agreement with compared program.Grapheneprogram has better results than compared program by comparing with the experimental results.The research methods and results of this paper can provide an important reference for the safe emission control of nuclear power and the implementation of relevant regulations.