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DOI: 10.1615/ICHMT.1996.TransientConvHeatTransf.210

A. V. Moskovchenko
Russian Academy of Sciences, Nuclear Safety Institute, 52 Bol'shaya Tul'skaya, 113191 Moscow, Russia

V. F. Strizhov
Nuclear Safety Institute, Russian Academy of Sciences, Bolshaya Tul'skaya 52, Moscow 113191, Russia


The special mechanism of in-vessel debris cooling is considered which is rather important in the case of week fragmentation of melt core relocation to the lower head. Under such conditions upward heat transfer via boiling at the upper debris surface may be enhanced due to cracks formation and coolant penetration along the crack walls. In this work the possible stationary states of the upper crust temperature field were studied. Dependencies of the main problem parameters (upward heat flux; heat flux transfered via boiling in cracks; upper crust thickness) on the characteristic distance between cracks and the depth of water penetration along crack walls were obtained.

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