湖库型核电厂低放废水排放的数值模拟

以富水水库为分析对象,利用CFD(Fluent)软件,采用realizable k-ε湍流模型和组份输运模型,模拟了不同来水条件下3种排水口方案的流场和低放废水中的代表核素氚(3 H)的浓度场.结果表明,所建模型能合理地模拟水库的流场和浓度场;流场与浓度场基本耦合,低速区和漩涡区中的核素输运不畅,会出现累积现象,流速越大,污染物的输运效率越高;排水口的位置对浓度分布影响较大,排放口应远离低速区和漩涡区,在同种工况条件下,3号排水方案时水流对核素的稀释作用最大,并且符合国家的核素排放标准,是最佳的排水口方案.

Numerical simulation of low level radioactive cooling water released from nuclear power plants in lakes and reservoirs

Based on the CFD(Fluent) software,this paper takes the Fushui Reservoir as object,simulating the velocity field and the concentration field of radionuclide(3H)in the low level radioactive cooling water under three different outfall and different runoff conditions by the realizable k-ε turbulence model and species transport model.The results show that,the velocity field and concentration field of reservoir can be simulated properly through the proposed model.The velocity field and concentration field are coupled well;the radionuclide can't be transported well in the low-velocity areas and whirlpool areas,also there will be cumulation phenomenon;and the transport efficiency increase with the velocity.Outfall should be located away from low-velocity areas and whirlpool areas because of its large impact on the concentration field;the third outfall is the best outlet program;and the radionuclide can be diluted best by the program;the concentration of radionuclide meets the national emission standards as well.