Simulation of steam condensation experiment in the presence of noncondensible gases using RELAP5/MOD3 thermal hydraulic code
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A computational investigation of a two dimensional condensation phenomenon in the presence of noncondensible gases was performed. The RELAP5/MOD3 thermal hydraulic code was utilized for this analysis. A separate effect experiment was studied which was relevant to actual situations encountered in the nuclear industry. The experiment investigated was the Massachusetts Institute of Technology's (MIT) steam condensation experiment. This experiment modeled the proposed containment cooling system for advanced reactors. Steam was generated in a vessel in which air was present. The steam in the steam-air mixture condensed on the surface of a cooled copper cylinder. In order to capture the variation in radial properties across the vessel a new method of nodalization was used. This was used to separate the bulk fluid properties from those near the condensing surface. The simulations were carried out at different air fractions and at different pressures. It was found that the calculated trends and values in heat transfer coefficients compared better with the experimental data than those calculated using the conventional one-stack nodalization technique.
