Alternate Design of ITER Cryostat Skirt Support System

10th Asia Plasma and Fusion Association Conference

Kumar Pandey, Manish^1 ; Kumar Jha, Saroj^1 ; Kumar Gupta, Girish^1 ; Bhattacharya, Avik^1 ; Jogi, Gaurav^1 ; Kumar Bhardwaj, Anil^1

ITER-India, Institute for Plasma Research, Sangath Skyz, Bhat-Motera Road, Koteshwar, Ahmedabad, Gujarat

380005, India^1

关键词: ASME Section VIII;    Elastic-plastic analysis;    Full-penetration weld;    Horizontal plates;    Operational conditions;    Proportionality factors;    Structural impact;    Welding distortion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/823/1/012038/pdf
DOI  :  10.1088/1742-6596/823/1/012038

来源: IOP

【 摘 要 】

The skirt support of ITER cryostat is a support system which takes all the load of cryostat cylinder and dome during normal and operational condition. The present design of skirt support has full penetration weld joints at the bottom (shell to horizontal plate joint). To fulfil the requirements of tolerances and control the welding distortions, we have proposed to change the full penetration weld into fillet weld. A detail calculation is done to check the feasibility and structural impact due to proposed design. The calculations provide the size requirements of fillet weld. To verify the structural integrity during most severe load case, finite element analysis (FEA) has been done in line with ASME section VIII division 2 [1]. By FEA 'Plastic Collapse' and 'Local Failure' modes has been assessed. 5°sector of skirt clamp has been modelled in CATIA V5 R21 and used in FEA. Fillet weld at shell to horizontal plate joint has been modelled and symmetry boundary condition at ±2.5°applied. 'Elastic Plastic Analysis' has been performed for the most severe loading case i.e. Category IV loading. The alternate design of Cryostat Skirt support system has been found safe by analysis against Plastic collapse and Local Failure Modes with load proportionality factor 2.3. Alternate design of Cryostat skirt support system has been done and validated by FEA. As per alternate design, the proposal of fillet weld has been implemented in manufacturing.