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In order to evaluate the consequences of the sodium- carbon dioxide chemical reaction in the Na-CO2 heat exchanger of the KALIMER-600, the trends of the pressure and temperature variations during a boundary failure accident were investigated by using the STASCOR code, which was developed to qualitatively analyze thermodynamic behavior coupled with an Na-CO2 chemical reaction. The analysis results for the long-term behavior of a tube rupture accident and its consequences, which lead to a significant system transient, are illustrated in this section. The capabilities of the simplified numerical quantification method implemented in the STASCOR code were evaluated as well. The physical model for a simplified mass and energy transfer (SMET) was developed by using the following assumptions; (i) the reaction occurs instantaneously if CO2 gas leaks into the sodium phase, (ii) non-reacted quantity of CO2 gas in the sodium phase is negligible, (iii) the generation quantity of the gaseous reaction product totally depends on the mass conversion ratio from the leaked CO2 gas, (iv) exothermic energy from the chemical reaction is uniformly dissipated into the reaction zone (e.g. liquid sodium), (v) all of the mass of the gaseous reaction products flows into the cover gas space, (vi) the energy of the inflow gas is equalized with the sodium temperature heated by the chemical reaction (vii) the dissolution ratio of the gaseous reaction product into the liquid sodium is negligible. Based on the physical model and assumptions, the energy balance between the cover gas and the shell-side sodium can be described as shown in Figure 17. The energy balance presented here does not contain terms representing the phase change of the reaction products for a simplification of the phenomena. CHAetal., DevelopmentofaSupercriticalCO2BraytonEnergyConversionSystemCoupledwithaSodiumCooledFastReactor Fig. 17. Energy Balance around the Cover Gas Region (SMET Model) Fig. 18. Transient Behaviors of Reaction Source Terms NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.41 NO.8 OCTOBER 2009 1041PDF Image | DEVELOPMENT OF A SUPERCRITICAL CO2 BRAYTON ENERGY
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