Actual problems of modeling thermal-hydraulic processes in fast neutron reactors
The 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...
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| Language: | English |
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National Research Nuclear University (MEPhI)
2024-11-01
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| Series: | Nuclear Energy and Technology |
| Online Access: | https://nucet.pensoft.net/article/139463/download/pdf/ |
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| author | Yulia A. Kuzina Alexander P. Sorokin |
| author_facet | Yulia A. Kuzina Alexander P. Sorokin |
| author_sort | Yulia A. Kuzina |
| collection | DOAJ |
| description | The 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. |
| format | Article |
| id | doaj-art-f9f9d908aa184b72bc2bb8c2120c2304 |
| institution | Kabale University |
| issn | 2452-3038 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | National Research Nuclear University (MEPhI) |
| record_format | Article |
| series | Nuclear Energy and Technology |
| spelling | doaj-art-f9f9d908aa184b72bc2bb8c2120c23042024-11-21T08:31:43ZengNational Research Nuclear University (MEPhI)Nuclear Energy and Technology2452-30382024-11-0110424125010.3897/nucet.10.139463139463Actual problems of modeling thermal-hydraulic processes in fast neutron reactorsYulia A. Kuzina0Alexander P. Sorokin1IPPE JSCIPPE JSCThe 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.https://nucet.pensoft.net/article/139463/download/pdf/ |
| spellingShingle | Yulia A. Kuzina Alexander P. Sorokin Actual problems of modeling thermal-hydraulic processes in fast neutron reactors Nuclear Energy and Technology |
| title | Actual problems of modeling thermal-hydraulic processes in fast neutron reactors |
| title_full | Actual problems of modeling thermal-hydraulic processes in fast neutron reactors |
| title_fullStr | Actual problems of modeling thermal-hydraulic processes in fast neutron reactors |
| title_full_unstemmed | Actual problems of modeling thermal-hydraulic processes in fast neutron reactors |
| title_short | Actual problems of modeling thermal-hydraulic processes in fast neutron reactors |
| title_sort | actual problems of modeling thermal hydraulic processes in fast neutron reactors |
| url | https://nucet.pensoft.net/article/139463/download/pdf/ |
| work_keys_str_mv | AT yuliaakuzina actualproblemsofmodelingthermalhydraulicprocessesinfastneutronreactors AT alexanderpsorokin actualproblemsofmodelingthermalhydraulicprocessesinfastneutronreactors |