Abstract In the frame of the EUROfusion consortium activities the Helium Cooled Pebble Bed (HCPB) and the Water Cooled Lithium Lead (WCLL) concepts are being developed as possible candidates to become driver Breeding Blanket (BB) for the EU DEMO, which aims at the tritium self-sufficiency and net electricity production. The two BB design options encompass water or helium as coolants and solid ceramic with beryllium/beryllides or PbLi as tritium breeder and neutron multipliers. The BB segments have evolved towards a more stable conceptual design taking into account multiple feasibility aspects and requirements imposed by interfacing systems. Possible solutions to improve shielding capabilities of Helium cooled BB are investigated and the impact of water coolant activation is assessed by studying the spatial distribution of 16N and 17N isotopes dose rates, in particular in proximity of isolation valves. The reference and back-up technologies for the Tritium Extraction and Removal (TER) from the helium purge gas and the PbLi are developed addressing key feasibility aspects and implications on the tokamak layout and with considerable R&D efforts. As the BB internals offer an ideal environment (high temperatures, thin structural material) to promote the tritium permeation, studies are devoted to establish a tritium balance in the different systems during operation, with special care to the permeation rate and inventory in the coolant. Those are the key parameters for the feasibility assessment and technology selection for the Coolant Purification Systems (CPS).

中文翻译：

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欧洲DEMO育种毯、氚提取和冷却液净化系统概念设计进展

摘要 在 EUROfusion 财团活动的框架内，氦冷球床 (HCPB) 和水冷铅铅 (WCLL) 概念正在开发中，作为欧盟 DEMO 的驱动程序育种毯 (BB) 的可能候选者，其目标是氚自给自足和净发电量。两种 BB 设计选项包括作为冷却剂的水或氦气和使用铍/铍化物或 PbLi 作为氚增殖剂和中子倍增剂的固体陶瓷。考虑到接口系统强加的多个可行性方面和要求，BB 段已经朝着更稳定的概念设计发展。研究了提高氦冷 BB 屏蔽能力的可能解决方案，并通过研究 16N 和 17N 同位素剂量率的空间分布来评估水冷却剂激活的影响，特别是在隔离阀附近。从氦吹扫气和 PbLi 中提取和去除氚 (TER) 的参考和备用技术是针对关键的可行性方面和对托卡马克布局的影响而开发的，并进行了大量的研发工作。由于 BB 内部构件提供了促进氚渗透的理想环境（高温、薄结构材料），因此研究致力于在运行期间在不同系统中建立氚平衡，特别注意冷却剂中的渗透率和存量。