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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

SOME ASPECTS OF HEAT TRANSFER DURING NUCLEAR REACTOR ACCIDENTS

Get access (open in a dialog) DOI: 10.1615/IHTC10.1950
pages 387-417

要約

Referring to heat transfer phenomena at some accident situations in Pressure Water Reactors, thermalhydraulic accident analysis of both current generations. Water-Cooled reactors and Advanced Water-Cooled Reactors depend on physical models or empirical equations describing the phenomena.
The breakup of melt jets in water is one of the important problems in the frame of severe accidents. The interaction with water yields fragmentation of the melt, mixing with water, rapid steam production and explosive events or thermal detonations.
The heat processes govern explosion phenomena, the coefficient of heat conversion to mechanical energy. One of the problems which must be solved for severe accidents is the fragmentation of melts. There exist only semi-empirical fragmentation models at present.
The second problem is the critical heat flux and some related aspects. A number of the mayor thermal hydraulic challenges can be associated with effect of dissolved gas, low mass velocities and low pressures. This is of great importance when the sound velocity can be achived in the circulating loop.
The CHF Look-up table method has become a widely accepted prediction technique. The recent CHF Look-up table is a significant improvement as compared to the previous ones.