Toward Consistent Design Evaluation of Nuclear Power Piping by Nonlinear Finite Element Analysis
2. Nonlinear Design Evaluation Alternatives – Class 1 Piping
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In accordance with ASME III, a nuclear piping system which is found to be disqualified, i.e., overstressed, in design evaluation using linear analysis software can still be qualified through using a set of alternative rules. The application of the alternative rules involves generally nonlinear finite element analyses where nonlinear conditions such as plasticity are taken into account. This chapter and subsequent chapters will clarify these alternative rules. In particular, we will address unclear or inconsistent issues in the Code, and will describe nonlinear finite element procedures which are required when using the alternative rules.