Film boiling heat transfer during reflood phase in postulated PWR loss-of-coolant accident.

概要

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A single heater rod PWR reflood heat transfer experiments and analyses of the PWRFull Length Emergency Core Heat Transfer (PWR-FLECHT) Group I data were carried out. The objectives of the experinients and the analyses were to evaluate film boiling heat transfer coefficients in the core during reflood phase of a postulated loss-of-coolant accident in pressurized water reactors, and to provide necessary information on heat transfer correlations for development of a safety analysis computer code.<BR>The results of these experiments showed that the film boiling heat transfer coefficients are strongly dependent upon the local subcooling at the quench front. It was found that when the subcooling at the quench front was zero, the saturated film boiling heat transfer coefficients could be expressed by a correlation similar to the Bromley correlation by introducing a representative length which is defined as the distance between the quench front and the elevation at which the coefficients are evaluated. When the subcooling at the quench front is not zero, the subcooled film boiling heat transfer coefficients could be expressed by a simple correlation. This correlation predicted that experimental results within the error band of ±20%.
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