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Becht Engineering Blog

In this section of the site contributing authors submit interesting articles relating to the various services, industries and research & development efforts of Becht Engineering.

Environmentally-Assisted Fatigue (EAF) in Nuclear Power Plants

Environmentally-Assisted Fatigue (EAF) in Nuclear Power Plants
Before we tackle environmentally-assisted fatigue (EAF), what is fatigue? In ASME Boiler & Pressure Vessel Section III Division 1, Subsection NB (in short, ASME III NB) fatigue refers to the damage caused by systems and components as a result of cyclic loads. The qualification of the primary coolant system of light water reactors (ASME III Class 1 components) must address the fatigue damage caused by pressure and thermal cycling of the equipment and piping during their design life. How is fatigue life analysed and qualified for 40 years, 60 years, or more of service? The fatigue analysis and qualification is achieved by following a procedure outlined in ASME III Div.1 Subsection NB for Class 1 piping and components. This procedure can be outlined in five key steps: STEP-1 TRANSIENTS : Developing the thermal and pressure transients, in the form of time-dependent functions P i (t) and T i (t). For each...
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