Development and validation of one-dimensional and three-dimensional coupling methods based on ComspaFOAM
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With the introducing of passive containment cooling systems (PCCS) in 3rd and 4th generation PWR nuclear power plants, the coupling effects between the passive containment cooling systems and containment must be clarified for the accidents analysis. Thus, a new coupling solver ComspaFOAM was developed based on OpenFOAM and previous validated solvers, ComspaFOAM-SYS1D and ComspaFOAM-TH3D. The porous medium method and boundary coupling method were proposed to realize the coupling. Without additional interface of data transfer, the simulations based on ComspaFOAM was more integrated and accurate compare to the previous simulations. Experimental data from passive containment cooling system comprehensive performance test facility were used for the validation of ComspaFOAM, including steady and unsteady cases. The results indicated that both of the coupling method could be used for coupled dynamics analysis of PCCS and containment. Between simulation results and experimental results, the differences of time-averaged parameters and the dynamic extremum parameters were within ±20 % for all the validation cases. The deviation of the oscillation period of the unsteady cases decreased from ±25 % to ±10 % when coupling methods were applied in simulations. Meanwhile, the differences between the results from different coupling methods were compared based on the analysis of temperature distribution and hydrogen risk.
Abstract
With the introducing of passive containment cooling systems (PCCS) in 3rd and 4th generation PWR nuclear power plants, the coupling effects between the passive containment cooling systems and containment must be clarified for the accidents analysis. Thus, a new coupling solver ComspaFOAM was developed based on OpenFOAM and previous validated solvers, ComspaFOAM-SYS1D and ComspaFOAM-TH3D. The porous medium method and boundary coupling method were proposed to realize the coupling. Without additional interface of data transfer, the simulations based on ComspaFOAM was more integrated and accurate compare to the previous simulations. Experimental data from passive containment cooling system comprehensive performance test facility were used for the validation of ComspaFOAM, including steady and unsteady cases. The results indicated that both of the coupling method could be used for coupled dynamics analysis of PCCS and containment. Between simulation results and experimental results, the differences of time-averaged parameters and the dynamic extremum parameters were within ±20 % for all the validation cases. The deviation of the oscillation period of the unsteady cases decreased from ±25 % to ±10 % when coupling methods were applied in simulations. Meanwhile, the differences between the results from different coupling methods were compared based on the analysis of temperature distribution and hydrogen risk.