Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : June 14, 2017 - June 15, 2017
Venturi scrubber is installed in nuclear power plant as a component of filtered venting system and used to remove small aerosols with fission products. There is no method for desk analysis to estimate its decontamination performance in the assumed operating pressure range. In this study, we propose a method to estimate the decontamination performance based on mechanistic thermal hydrodynamic simulation code and report simulated results of the thermal hydrodynamics and decontamination performance in the pressure range in actual environments. With decrease in inlet pressure of the Venturi scrubber as containment vessel side from venting start 650 kPaA, gas flow velocity at the throat of the Venturi scrubber was suppressed under 250 m/s by effect of compressibility of the gas, liquid flow velocity in a hole of it by self-priming changed with self-priming phenomena and the decontamination factor decreased except on some of the gas velocity condition. The tendency of the decontamination factor have high value conformed with a report of Luangdilok et al.(2009). The capability of the method to predict and evaluate the decontamination performance in actual environments was confirmed qualitatively because of the conformation.
