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Actual problems of modeling thermal-hydraulic processes in fast neutron reactors

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creativeworkseries.issn2452-3038
dc.contributor.authorKuzina, Yu. A.
dc.contributor.authorSorokin, A. P.
dc.date.accessioned2024-11-21T08:17:10Z
dc.date.available2024-11-21T08:17:10Z
dc.date.issued2024
dc.description.abstractThe results of studies on hydrodynamics and heat transfer processes in fast neutron reactors are presented. Data on turbulent momentum transfer in rod bundles are analyzed. It is shown that the intensification of turbulent momentum transfer in the rod bundle channels is due to large-scale turbulent momentum transfer (secondary currents). The intensification of interchannel turbulent exchange in close-packed lattices of rods is explained. A dependence is obtained for the dissimilarity coefficients of interchannel convective exchange forced by wire wrapping in bundles of rods. The methods and results of numerical modeling of thermal hydraulics using the Monte Carlo method, thermomechanical analysis of the temperature field in fuel rod assemblies in the lifetime process are presented. The results of modeling based on a water model of temperature fields and the structure of coolant movement in the primary circuit of the reactor in various regimes are presented. A stable temperature stratification of the coolant was revealed in the peripheral zone of the upper chamber of the reactor above the side screens. It is shown that the process of boiling liquid metals in fuel assemblies has a complex structure, characterized by stable and pulsating regimes and a heat transfer crisis. The agreement between the results of experimental and numerical modeling is shown. A cartogram of the flow regimes of a two-phase flow of liquid metals in fuel rod assemblies has been plotted. The influence of the surface roughness of fuel elements on the boiling process and heat transfer during boiling of liquid metals is analyzed. Long-term cooling of a fuel assembly with a “sodium cavity” above the reactor core in accident regimes with boiling of liquid metals is shown. The objectives of further research are formulated.
dc.identifier.citationKuzina YuA, Sorokin AP (2024) Actual problems of modeling thermal-hydraulic processes in fast neutron reactors. Nuclear Energy and Technology 10(4): 241–250. https://doi.org/10.3897/nucet.10.139463
dc.identifier.doi10.3897/nucet.10.139463
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/17919
dc.identifier.urihttps://nucet.pensoft.net/article/139463/
dc.publisherНИЯУ МИФИ
dc.subjecttwo-fluid model
dc.subjectroughness
dc.subjectboiling regimes
dc.subjectcoolant temperature stratification
dc.subjectinterchannel exchange
dc.subjectturbulent transfer
dc.subjectcomputational modeling
dc.subjectexperiment
dc.subjectheat transfer
dc.subjecthydrodynamics
dc.subjectfuel rod assemblies
dc.subjectreactor tank
dc.subjectfast reactor
dc.titleActual problems of modeling thermal-hydraulic processes in fast neutron reactors
dc.typeArticle
dspace.entity.typePublication
relation.isJournalIssueOfPublication81a47c25-536d-4087-aa9f-410b43f0617c
relation.isJournalIssueOfPublication.latestForDiscovery81a47c25-536d-4087-aa9f-410b43f0617c
relation.isJournalOfPublicatione11ecc6c-1851-485a-af73-18119b4fce7f
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