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• W1497003068 abstract "To study the behaviour of nuclear power plants, sophisticated and complex computer codes are needed. Before the computer codes are used for safety evaluations they have first to be validated. The assessment process of system codes involves the comparison of code results against experimental data and measured plant data. The accuracy of the code is the capability of the code to correctly predict the physical behaviour. Therefore the evaluation of accuracy coincides with code validation. In the past a few methods to quantify the code accuracy of thermal-hydraulic system codes have been proposed. Among the proposed methods, the approach using the fast Fourier transform has been proposed as one of the most effective approaches in 1990s (Ambrosini et al., 1990; D’Auria et al., 1994). The fast Fourier transform based method (FFTBM) shows the measurement-prediction discrepancies, i.e. the accuracy quantification, in the frequency domain. From the amplitudes of the component frequencies, the average amplitude (AA) is calculated. AA sums the difference between experimental and calculated signal discrete Fourier transform amplitudes at each frequency. To get a dimensionless accuracy measure, the sum of the amplitudes of the experimental signal is used for normalization. The closer the non-dimensional AA value is to zero, the better the agreement between the calculated results and the experimental measurements is judged. However, some problems involved in FFTBM, such as proper selection of time windows, weighting factors, number of discrete data used, consistency of the method in all cases and time dependent accuracy, still remain open and partly limit its application, especially those requiring a consistent accuracy judgement. For example, in early applications of FFTBM problems in evaluating signals, where experimental or error signal has the shape similar to triangle (i.e. first increases and then decreases), the accuracy value regularly overshoots at triangle peak, stabilising at lower value when discrepancy decease (Mavko et al. 1997). Not being aware about the reasons of such or some other strange behaviour, the FFTBM method has been also criticized. In general it is required that at any time into the transient the accuracy measure should remember the previous history. But on the other hand, the original FFTBM method has been effectively applied in obtaining information on code accuracy by several researchers in the literature. More recently, an automated code assessment program (ACAP) has been developed to provide a quantitative comparison between nuclear reactor system code results and" @default.
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• W1497003068 date "2011-04-11" @default.
• W1497003068 modified "2023-10-18" @default.
• W1497003068 title "Application of Fast Fourier Transform for Accuracy Evaluation of Thermal-Hydraulic Code Calculations" @default.
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• W1497003068 doi "https://doi.org/10.5772/15735" @default.
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