The impediment of core disruption is realized through the provision of diverse and redundant safety features in the design complemented by the use of inherent passive mechanisms that respond to the accident condition by ensuring convenient dispersal of molten core material from the core in the early stage of the accident. In light of this, a promising design strategy Fuel Assembly Inner DUct Structure (FAIDUS) core concept is proposed to enhance the axial discharge capability of molten fuel from core for the exclusion of core wide melt pool formation. The sequence of event during the course of relocation in the FAIDUS is analysed employing a transient integrated thermal-hydraulic model. The effectual performance of various FAIDUS design options in mitigating the accident is evaluated. Based on this, the preferred design choice conforming the laid down criteria is selected in the present study. The simulation results suggest that FAIDUS design concept delivers the best alternative way for extenuating accident progress through a comprehensive melt relocation strategy of greater reliability in an intrinsic way.

通过在设计中提供多样化和冗余的安全功能，以及通过使用固有的无源机制来补充堆芯的阻碍，从而确保事故发生初期对事故状况的反应，从而确保堆芯熔融物从堆芯中方便地从堆芯中散出，从而实现了堆芯破裂的障碍。事故。鉴于此，提出了一种有前途的设计策略，即燃料组件内部管道结构（FAIDUS）堆芯概念，以增强从堆芯的熔融燃料的轴向排放能力，以排除堆芯宽熔池形成。使用瞬态集成热工水力模型分析了FAIDUS中重新安置过程中的事件顺序。评估了各种FAIDUS设计方案在缓解事故方面的有效性能。基于此，在本研究中选择符合规定标准的首选设计选择。仿真结果表明，FAIDUS设计理念通过一种内在的，可靠性更高的综合熔体重新布置策略，为减轻事故进程提供了最佳的替代方法。