Abstract
Abstract Nowadays, statistical approaches are used in the design and operation stages of large engineering systems. In this context, this paper summarizes the characteristics of various conventional methods of uncertainty and sensitivity analysis, mainly in the point of view of uncertainty propagation, sensitivity analysis, and reduced model construction capabilities. Then, a new technique based on the Fourier amplitude sensitivity test and stepwise regression technique is suggested and applied to the thermal margin analysis for peak clad temperature at loss of coolant accident, which is one of the most important parameters in the design and operation of nuclear reactors.
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