Stress constraints for optimization are usually applied to the concerned points rather than the concerned section. The prescription of the ASME Sec. III is quite different from the general stress constraints. According to the ASME Sec. III, the stress linearization should precede the evaluation of failure condition of a structure. In order to adopt the linearization of stress to the constraints of optimization, extra data manipulation such as calculating linearized stresses and derivatives of the linearized stress is to be conducted. In this research, the optimization technique that utilizes the result of stress linearization as a constraint is proposed. The proposed method was applied to the shape design of central cover of the SMART reactor.
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