10th International Conference on Nuclear Engineering, Volume 3 · 2002 · 14 citations · 0 references
EngineeringComputational EngineeringNuclear EngineeringComputational Fluid DynamicsFluid DynamicsHeat TransferHeat Transfer In ReactorsHeat Transfer ModelingSteam InjectionThermal SimulationThermal-hydraulic ControlThermal-hydraulic Safety AnalysisMass Flow RateNon-equilibrium Thermal TransportReactor Thermal-hydraulic ModelingThermal Hydraulic AnalysisThermal-hydraulic PerformanceThermal-hydraulicsTwo-fluid ModelVoid Fraction Distribution
The study uses a non‑equilibrium thermal‑hydraulic approach for horizontal steam generators. Three‑dimensional two‑fluid simulations using the 3D ANA code, incorporating closure laws for interface transport, flow resistance, and energy transfer, were performed at 50–110 % load and validated against experimental data, with a 1‑D RELAP5 model derived from the 3‑D results. The simulations produced detailed maps of mass flow, void fraction, recirculation, swell level, and shell‑side water inventory, and the 3D ANA and RELAP5 results agreed acceptably.
Three-dimensional computer simulation and analyses of the horizontal steam generator thermal-hydraulics of the WWER 1000 nuclear power plant have been performed for 50% and 75% partial loads, 100% nominal load and 110% over-load. Presented results show water and steam mass flow rate vectors, steam void fraction spatial distribution, recirculation zones, swell level position, water mass inventory on the shell side, and other important thermal-hydraulic parameters. The simulations have been performed with the computer code 3D ANA, based on the “two-fluid” model approach. Steam-water interface transport processes, as well as tube bundle flow resistance, energy transfer, and steam generation within tube bundles are modelled with “closure laws”. Applied approach implies non-equilibrium thermal and flow conditions. The model is solved by the control volume procedure, which has been extended in order to take into account the 3D flow of liquid and gas phase. The methodology is validated by comparing numerical and experimental results of real steam generator operational conditions at various power levels of the WWER Novovoronezh, Unit 5. One-dimensional model of the horizontal steam generator has been built with the RELAP 5 standard code on the basis of the multidimensional two-phase flow structure obtained with the 3D ANA code. RELAP 5 and 3D ANA code results are compared, showing acceptable agreement.