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THERMAL RADIATION MODELING IN NUMERICAL SIMULATION OF MELT-COOLANT INTERACTION

DOI: 10.1615/ICHMT.2008.CHT.500
25 pages

Leonid A. Dombrovsky
Joint Institute for High Temperatures, 17A Krasnokazarmennaya Str., Moscow, 111116, Russia; Tyumen State University, 6 Volodarsky Str., Tyumen, 625003, Russia

M. V. Davydov
Electrogorsk Research & Engineering Center on NPP Safety, Saint Constantine 6,142530, Electrogorsk, Moscow region, Russia

P. Kudinov
Division of Nuclear Power Safety, Royal Institute of Technology (KTH), Roslagstullbacken 21, Alba Nova, Stockholm 10691, Sweden

Abstract

The paper is concerned with radiation heat transfer modeling in multi-phase disperse systems, which are formed in high temperature melt−coolant interactions. This problem is important for complex interaction of the core melt with water in the case of hypothetical severe accident in light water nuclear reactors. The non-local effects of thermal radiation due to semi-transparency of water in the visible and near infrared spectral ranges are taken into account by use of recently developed large-cell radiation model (LCRM) based on the spectral radiation energy balance for single computational cells. In contrast to the local approach for radiative heating of water by particles (OMM − opaque medium model), the LCRM includes radiative heat transfer between the particles of different temperatures. The regular integrated code VAPEX-P intended to model the premixing stage of FCI was employed for verification of LCRM in a realistic range of the problem parameters. A comparison with the OMM and more accurate P1 approximation showed that LCRM can be recommended for the engineering problem under consideration. The effects of temperature difference in solidifying particles are analyzed by use of the recently suggested approximation of transient temperature profile in the particles. It is shown that effect of the temperature difference on heat transfer from corium particles to ambient water is considerable and should not be ignored in the calculations. An advanced computational model based on LCRM for the radiation source function and subsequent integration of radiative transfer equation along the rays is also discussed in the paper.

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