As a critical part of a breeding blanket of fusion reactor or DEMO, it is a common method to design and optimize the first wall separately before the mechanical evaluation of the fully integrated blanket. To understand the difference between the simplified first wall models and the fully integrated first wall/blanket model, the differences of the mechanical behavior between the simplified and integrated models are studied in this paper. The results provide a reference for the conceptual design and optimization of the first wall. Based on the HCCB (helium-cooled ceramic breeder) DEMO blanket model, the mechanical analysis of the integrated model was carried out, and the relatively accurate mechanical characteristics of the first wall for M-type and C-type damage were obtained. Considering the results of the integrated model as a basis, the mechanical analysis of the M-type and C-type for the 2 typical simplified model was carried out. For the separate first wall model, the maximum differences of M-type and C-type are -19% and -17%, respectively. For the most simplified model, the maximum differences of M-type are -17%, the differences of C-type are seriously deviated from the results of the integrated model. The results indicate that one quarter first wall model with reasonable constraints is closer to the results of the fully integrated FW/blanket model. The analysis results of one quarter first wall model can be used as a reference for the conceptual design of the first wall and can be utilized to optimize the first wall design based on the stress limits for prevention of the M-type and C-type damage modes.

作为聚变反应堆或DEMO繁殖毯的关键部分，在对完全集成的毯进行机械评估之前，单独设计和优化第一壁是一种常见的方法。为了了解简化的第一壁模型与完全集成的第一壁/毛毯模型之间的差异，本文研究了简化模型与集成模型之间的力学行为差异。研究结果为第一壁的概念设计和优化提供了参考。基于HCCB（氦冷却陶瓷育种）DEMO毯模型，对集成模型进行了力学分析，并获得了相对准确的第一壁M型和C型损伤的力学特性。以综合模型的结果为基础，对2种典型简化模型进行了M型和C型的力学分析。对于单独的第一壁模型，M型和C型的最大差异分别为-19％和-17％。对于最简化的模型，M型的最大差异为-17％，C型的差异严重偏离了集成模型的结果。结果表明，具有合理约束的四分之一第一壁模型更接近于完全集成的FW /毛毯模型的结果。四分之一第一壁模型的分析结果可作为第一壁概念设计的参考，并可根据应力极限来优化第一壁设计，以防止M型和C型损坏模式。