后处理厂乏燃料储运吊篮设计与分析

Design and analysis of the spent fuel transfer basket for the reprocessing plant

在后处理厂乏燃料贮存水池,采用吊篮储存和转运乏燃料组件可以提升转运能力,同时具有较好的安全性和经济性。本文针对国内商业核电站服役使用的典型乏燃料组件结构参数,设计了可一次性装载8盒乏燃料组件的储运吊篮,利用SuperMC软件对满载乏燃料组件的储运吊篮进行了临界安全分析,再利用ANSYS有限元软件对其进行抗震分析。临界安全分析结果表明:即使满载乏燃料组件的吊篮在无限大乏燃料贮存水池内紧密排列,贮存水池keff最高仅0.906;抗震分析结果表明:在0.3 g设计地震震动加速度下,吊篮最大结构应力为7.92 MPa,最大形变量为0.32 mm,不影响其功能。因此储运吊篮设计合理,可满足后处理厂乏燃料水池储运吊篮的基本安全要求。

[Background]The transportation capacity can be enhanced by using transfer basket in the spent fuel pool of a reprocessing plant.At the same time,the safety and economy of the spent fuel reprocessing can be reinforced by the transfer basket.[Purpose]This study aims to design transfer basket for typical spent fuel assemblies in China.[Methods]Based on the transfer requirements of spent fuel assembly in the reprocessing plant,the basket was designed to carry eight spent fuel assemblies as one time loading.Both criticality safety analysis and seismic analysis were carried out to evaluate the reliability of the basket by using SuperMC and ANSYS codes,respectively.[Results]The results of criticality safety analysis show that the keff of the spent fuel pool is only 0.906 even if the baskets are closely arranged in the spent fuel pool.The results of seismic analysis show that the maximum stress of the basket is 7.92 MPa and the maximum deformation is only 0.32 mm under the seismic acceleration of 0.3 g.[Conclusions]The above results show that the structure of the basket is reasonable,and meets the basic safety requirements of the transfer basket of a reprocessing plant.