New non-equilibrium thermal-hydraulic model. (II) Application to LOFT l2-3.

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Abstract
A through analysis of LOFT L2-3 is made with the THYDE-P code, which is based on the new non-equilibrium thermal-hydraulic model. The various assumptions and correlations in use for the present analysis are explained. In order to investigate DNB (departure from nucleate boiling), rewetting and quenching at the pool condition, several parameters are defined. The interfacial heat transfer coefficient between the gas and the liquid is assumed to have the same pressure dependence as of nucleate boiling. The overall trends of the experiment are well reproduced by the calculation. Much effort was found necessary, however, to better understand DNB, rewetting and quenching at the pool condition, by taking into account the stored thermal energy and the stationariness of the temperature distribution in the fuel rod.

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