Abstract
The component of ITER facing directly to plasma is called the first wall. The first wall is composed of DSCu/SS316 HIP bonded structure. In addition to residual stress due to the HIP bonding process the electromagnetic force is loaded on the first wall during plasma disruption. In this study, we assume an initial crack in the first wall. Stress induced by the electromagnetic force at the crack tip is estimated by finite element method taking the residual stress into consideration. From a viewpoint of fracture mechanics, stress intensity factor K is evaluated to make sure the structural integrity of the DSCu/SS316 HIP bonded structure. As a result of analyses, the stress intensity factor K is not so large for all of the assumed cracks. Therefore, there is no possibility of fracture due to the crack growth during the lifetime of the first wall.
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