某核电厂安全壳内置换料水箱搅混性能优化分析

Optimal Analysis of Mixing Performance of In-Containment Refueling Water Storage Tank in a Nuclear Power Plant

针对某核电厂双环池型安全壳内置换料水箱(IRWST),采用计算流体动力学(CFD)方法对其流场进行模拟,通过均匀性准则数和低速区体积比对其搅混效果进行定量评价。结果表明:通过合理的搅混管线布置,本双环池型IRWST的综合搅混效果优于欧洲压水堆(EPR)核电厂,保证了工程的可用性。进一步针对IRWST的现有结构提出2种优化方案,结果表明:通过缩小内环搅混管线管径和调整部分搅混管线的布置方向,可以有效地提升IRWST的搅混效果。

A CFD method is used to simulate the flow field of double loop In-containment Refueling Water Storage Tank（IRWST） in a nuclear power plant, and an uniformity criterion number and volume ratio of low velocity region is adopted to quantitatively evaluate the mixing performance of IRWST. Results indicate that the comprehensive mixing performance of double loop IRWST is better than European Pressurized Water Reactor（EPR） nuclear power plant by reasonable arrangement of mixing pipes, which ensures the availability in engineering application. Further two structural optimizations are proposed, and the results show that the mixing performance of IRWST can be improved by reducing the diameter and adjusting the direction of mixing pipes.