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Fatigue evaluation of ASME Class 1 components considering the environmental effects

Miguel Mattar Neto, Eduardo Maneschy

Abstract

A discussion considering fatigue design basis (FDB) and fatigue operating basis (FOB) approaches is presented. These two concepts are applied to evaluate the lifetime of typical ASME 3 class 1 components through simplified and detailed stress analysis. The cumulative usage factor (CUF) calculated using S-N fatigue curves available in the ASME 3 are compared to those obtained by S-N curves modified by the reactor environment. Some recommendations are presented to assess the fatigue in nuclear power plants structures.

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Key concepts: Basis (linear algebra), Class (philosophy), Structural engineering, Stress (linguistics), Engineering, Environmental stress, Power (physics), Reliability engineering