Abstract In the frame of the EU DEMO development program within the EUROfusion Consortium, the integration of the in-vessel components is crucial even at an early stage of the design process. The auxiliary, heating and fueling systems have to be integrated into the Breeding Blanket and, thus, they will undergo to a harsh nuclear environment during operation, and have a significant impact on the Tritium Breeding capability, loads and shielding performances. This work presents the neutronics and thermal analyses performed to support the integration studies of the pellet injection systems. This study is mainly devoted to optimize the design of a fueling line option consisting in a protrusion of the Vacuum Vessel (VV) in the inboard side supporting a guiding tube to drive the pellets along the ideal trajectory as close as possible to the First Wall. An alternative concept with a free-flight injector through the upper port, has also been studied evaluating the feasibility and the shielding needs. The three-dimensional neutronics simulations were carried-out with the MCNP5 Monte-Carlo code using a DEMO model with the integrated systems to calculate neutron fluxes, damage and nuclear heating distribution. Thermal analyses were carried-out using ABAQUS. Results of neutronics and thermal analyses on the fueling systems are presented and discussed.

中文翻译：

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EU-DEMO颗粒注射系统的中子学相关集成研究

摘要 在 EUROfusion Consortium 内的 EU DEMO 开发计划的框架中，即使在设计过程的早期阶段，容器内组件的集成也至关重要。辅助、加热和燃料系统必须集成到增殖毯中，因此它们在运行过程中将经历恶劣的核环境，并对氚增殖能力、负载和屏蔽性能产生重大影响。这项工作介绍了为支持弹丸注射系统的集成研究而进行的中子学和热分析。本研究主要致力于优化燃料管线选项的设计，该选项包括内侧真空容器 (VV) 的突出部分，支撑导管以沿着理想轨迹驱动颗粒尽可能靠近第一壁。还研究了通过上部端口自由飞行喷射器的替代概念，以评估可行性和屏蔽需求。三维中子学模拟是使用 MCNP5 Monte-Carlo 代码进行的，使用带有集成系统的 DEMO 模型来计算中子通量、损伤和核热分布。使用 ABAQUS 进行热分析。介绍和讨论了燃料系统的中子学和热分析结果。使用 ABAQUS 进行热分析。介绍和讨论了燃料系统的中子学和热分析结果。使用 ABAQUS 进行热分析。介绍和讨论了燃料系统的中子学和热分析结果。