Abstract Within the framework of EUROfusion R&D activity, a research campaign has been carried out at the University of Palermo, in close cooperation with ENEA labs, in order to preliminary design the top cap foreseen for the DEMO Water-Cooled Lithium Lead (WCLL) breeding blanket segments. Due to the high heat and pressure loads acting on such component, its design results particularly demanding and a specific multi-physics approach is needed, covering several aspects from thermal-hydraulics to structural assessments. Preliminary detailed CAD model of the cap integrated into the upper region of the WCLL breeding blanket outboard central segment has been set-up, equipped with proper cooling circuits as well as manifold and attachment systems according to the design of the equatorial elementary cell. A detailed numerical model has been set-up with the aim of simulating the thermo-mechanical behaviour of the above-mentioned system. Finally, the thermo-mechanical response of the upper breeding blanket region has been evaluated in terms of stress and temperature distributions, verifying that the structural material maximum temperature stays below its limit value and that structural integrity is ensured by means of the fulfilment of design rules reported in RCC-MRx structural design code.

中文翻译：

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DEMO水冷锂铅养殖毯段顶盖初步设计

摘要 在 EUROfusion 研发活动的框架内，巴勒莫大学与 ENEA 实验室密切合作开展了一项研究活动，以初步设计可预见的 DEMO 水冷锂铅 (WCLL) 育种的顶盖毯子段。由于作用在此类组件上的高热和压力负载，其设计结果特别苛刻，需要特定的多物理方法，涵盖从热工水力到结构评估的多个方面。已经建立了集成到 WCLL 育种毯外侧中央部分上部区域的帽的初步详细 CAD 模型，根据赤道基本单元的设计配备了适当的冷却回路以及歧管和附件系统。为了模拟上述系统的热机械行为，已经建立了详细的数值模型。最后，从应力和温度分布方面评估了上部繁殖毯区的热机械响应，验证了结构材料最高温度保持在其极限值以下，并通过满足设计规则来确保结构完整性在 RCC-MRx 结构设计规范中报告。