压水堆核电厂AFA3G燃料组件径向等效导热率研究

Research on the Radial Effective Heat Conductivityof AFA3G Fuel Assembly in PWRs

在乏燃料组件的运输和贮存过程中,如何有效地评估组件及承载设施对衰变热的响应是一项重要的工作。由于组件的结构复杂,考虑承载设施后的有限元模型会过于庞大,超过现有计算资源的承受能力。提出的改进方法将燃料组件等效为简单的固体导热模型,利用有限元方法得出AFA3G燃料组件的径向等效导热率,大大减低了计算成本,并与文献报道的国际通用的方法进行了比较。结果表明,在工程设计中,改进方法计算得到的等效导热率更为保守与合理。

In short term transportation or long term storage,one of the key works is evaluating the thermal response for the spent fuel assemblies canned in casks. Since the assembly is very complicated and especially the casks should be considered,the whole FEA model would be tremendous and treatment of the model is far beyond the affordability of calculating resource. Treating the assembly as a simple solid block and applying the effective heat conductivity in the thermal evaluation will largely reduce the calculating cost. In the paper an improved method was developed to get the effective heat conductivity and compared with the reference method.