Abstract:

ITER first walls (FWs) undertaken by China adopt a large number of welded joint structures, the cooling channel contains many welds which lead to high risk of leakage of cooling water, and there are key problems such as difficulty for replacement of the defective parts in the welding assembly. Based on the results of semi-prototype research and development, it needs to be changed and redesigned in the stage of full-scale prototype (FSP) manufacturing process qualification. Design key point is that the fingers adopt fixed structure of front dovetail slot and middle screw connection, and the finger pair adopts front welded pipe connection and middle pipe connector welded with central beam to form an internal cooling channel circuit. The structural thermal and elastoplastic analyses of the preliminary design model are carried out. The analysis results show that its temperature, displacement and strength are in the acceptance range. This structure can be used to further detail design of enhanced heat load first wall.

Key words: ITER, Blanket first wall, Preliminary design, Finite element analysis

摘要：

中方承制的ITER第一壁采用大量焊接连接结构，冷却通道焊缝多，冷却水泄漏风险大，且存在焊接装配难以更换缺损部件等关键问题。在全尺寸原型件工艺认证阶段，需基于半原型研发基础，对其进行更改设计。设计重点在于手指部件采用前部燕尾槽和中部螺钉连接的固定结构，手指对采用前部管管连接、中部管连接件与中心梁焊接形成内部冷却通道回路。对初步设计模型进行了结构热及弹塑性分析。分析结果显示其温度、位移、强度均在可接受范围内，可以采用这种结构继续进行整个增强热负荷第一壁的详细设计。

关键词: ITER, 包层第一壁, 初步设计, 有限元分析