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- W2568571889 abstract "The nufreq-npw (G.C. Park et al. NUREG/CR-3375, 1983; S.J. Peng et al. NUREG/CR-4116, 1984; S.J. Peng et al. Nucl. Sci. Eng. 88 (1988) 404–411) code was modified and set up at Westinghouse, USA, for mixed fuel type multichannel core-wide stability analysis. The resulting code, nufreq-npw, allows for variable axial power profiles between channel groups and can handle mixed fuel types. Various models incorporated into nufreq-npw were systematically compared against the Westinghouse channel stability analysis code mazda-nf (R. Taleyarkhan et al. J. Heat Transfer 107 (February 1985) 175–181; NUREG/ CR2972, 1983), for which the mathematical model was developed in an entirely different manner. Excellent agreement was obtained which verified the thermal-hydraulic modeling and coding aspects. Detailed comparisons were also performed against nuclear-coupled reactor core stability data. All 13 Peach Bottom-2 EOC-2/3 low flow stability tests (L.A. Carmichael and R.O. Neimi, EPRI NP-564, Project 1020-1, 1978; F.B. Woffinden and R.O. Neimi, EPRI, NP 0972, Project 1020-2, 1981) were simulated. A key aspects for code qualification involved the development of a physically based empirical algorithm to correct for the effect of core inlet flow development on subcooled boiling. Various other modeling assumptions were tested and sensitivity studies performed. Good agreement was obtained between nufreq-npw predictions and data. Moreover, predictions were generally on the conservative side. The results of detailed direct comparisons with experimental data using the nufreq-npw code have demonstrated that boiling water reactor core stability margins are conservatively predicted, and all data trends are captured with good accuracy. The methodology is thus suitable for boiling water reactor design and licensing purposes." @default.
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- W2568571889 date "1994-11-01" @default.
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- W2568571889 title "Benchmarking and qualification of the nufreq-npw code for best estimate prediction of multichannel core stability margins" @default.
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- W2568571889 doi "https://doi.org/10.1016/0029-5493(94)90040-x" @default.
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