In order to close the fuel cycle, the EU DEMO will be equipped with a breeding blanket (BB) for the on-site tritium production. In the water cooled lithium lead (WCLL) BB concept, the tritium will be generated in the liquid PbLi from which it must then be extracted.

The conceptual design of the tritium extraction and removal system for this BB concept is addressed here. It relies on the permeator against vacuum (PAV) technology, where the tritium dissolved in the PbLi is forced to cross a metal (Nb) membrane by pumping the vacuum on the secondary side. The proposed PAV geometrical configuration is based on the shell-and-tube concept, where the walls of the pipes in which the PbLi flows are the permeator membrane. The dimensioning of one permeator vessel for one of the PbLi loops is carried out here, adopting two different models for the tritium permeation: diffusion-limited (for the case of a non-contaminated membrane) and surface-limited (suitable for a contaminated Nb surface).

The results show that in the case of a non-contaminated membrane it is possible to reach the target tritium extraction efficiency also at the PbLi nominal operating temperature, while in the case of a contaminated membrane the PbLi should be heated to enhance the permeation.

为了关闭燃料循环，EU DEMO将配备用于现场blanket生产的繁殖毯（BB）。在水冷锂铅（WCLL）BB概念中，the将在液态PbLi中生成，然后必须从中提取extracted。

此处介绍了针对这种BB概念的extraction提取和去除系统的概念设计。它依靠渗透器抗真空（PAV）技术，其中溶解在PbLi中的the通过在次级侧泵送真空而被迫穿过金属（Nb）膜。提出的PAV几何构型基于壳管概念，其中PbLi流入的管道壁是渗透膜。在此对一个PbLi回路的一个渗透容器进行尺寸确定，对two的渗透采用两种不同的模型：扩散受限（对于未污染的膜而言）和表面受限（适用于受污染的Nb）表面）。

结果表明，在未污染的膜的情况下，也可以在PbLi标称工作温度下达到目标tri提取效率，而在被污染的膜的情况下，应加热PbLi以增强渗透性。