Structural analysis of the JT-60SA cryostat vessel body |
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Authors: | José Botija Javier Alonso Pilar Fernández Mercedes Medrano Francisco Ramos Esther Rincon Alfonso Soleto Sam Davis Enrico Di Pietro Valerio Tomarchio Kei Masaki Akira Sakasai Yusuke Shibama |
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Affiliation: | 1. Association EURATOM – CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain;2. Fusion for Energy, JT-60SA European Home Team, 85748 Garching bei Munchen, Germany;3. JAEA – Japan Atomic Energy Agency, Naka Fusion Institute, Ibaraki 311-0193, Japan |
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Abstract: | The JT-60SA cryostat is a stainless steel vacuum vessel (14 m diameter, 16 m height) which encloses the Tokamak providing the vacuum environment (10?3 Pa) necessary to limit the transmission of thermal loads to the components at cryogenic temperature. It must withstand both external atmospheric pressure during normal operation and internal overpressure in case of an accident.The paper summarizes the structural analyses performed in order to validate the JT-60SA cryostat vessel body design. It comprises several analyses: a buckling analysis to demonstrate stability under the external pressure; an elastic and an elastic–plastic stress analysis according to ASME VIII rules, to evaluate resistance to plastic collapse including localized stress concentrations; and, finally, a detailed analysis with bolted fasteners in order to evaluate the behavior of the flanges, assuring the integrity of the vacuum sealing welds of the cryostat vessel body. |
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