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第13届国际传热学会年报
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

MODELLING OF PROCESSES WITH DISBALANCE OF HEAT GENERATION AND HEAT SINK IN RBMK-1500 REACTOR

page 11
DOI: 10.1615/IHTC13.p7.80
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摘要

The main challenge, which leads to the overheating of the fuel elements and other core components in case of reactor accidents, is an unbalance between heat generation in the fuel elements and other core structures and heat sink. The main phenomenon, occurring in this case is the transition from nucleate coolant boiling to film boiling − Critical Heat Flux. In this paper the issues related to the modelling of CHF and post-CHF heat transfer in RBMK-1500 reactor, using RELAP5 and ATHLET codes, are discussed. The validation process of CHF phenomenon for RBMK-1500 on available experimental investigations performed in Russian research and design organizations are presented. The comparison results show that the CHF values calculated with RELAP5 and ATHLET are slightly lower than the experimental ones, if coolant quality is low. It shows that RELAP5 and ATHLET calculations give a more conservative view. However, in the case of high coolant quality (x > 0.6) the standard approach for CHF calculation can be used since in this region the RELAP5 code gives a good agreement with the experimental data.

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