The TRAC-PF1/MOD1 project determines the ability of various systems codes to predict the detailed thermal/hydraulic response of LWRs during accident and off-normal conditions. As part of this effort, calculations for some of the Northwestern University perforated-plate CCFL tests have been performed. Two input models were constructed to represent the rectangular test channel: a two-dimensional model and a faster-running one-dimensional model. The results of both models indicate that for high water flow rates, with the water injected vertically above a perforated plate, TRAC overpredicts the steam flow rate necessary for complete weeping (CCFL). However, for flow conditions more typical of PWR transients, TRAC provides a reasonable prediction of weeping.
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