Stress analysis and qualification of a parent vessel with sizeable internal vessels, extensive internal piping and associated supporting structures is performed using a single finite element model. A single model is desirable because of the coupling and interaction between various sized components, particularly for seismic, hydrodynamic and thermal evaluations. Qualification of the various types of components (shells, nozzles and beams) requires multiple design codes. Examples of some unique features and challenges encountered in the process of qualifying such vessels are presented.
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