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In view of the non-equilibrium characteristics of water vapor in the condensation process, there are deviations in the prediction of condensation process by various models. The surface tension of water droplets appears in the exponen-tial term of nucleation rate in the form of third power, which has a significant impact on the distribution of parameters such as condensation location, number of water droplets and steam wetness. The correction coefficient was used to modify the plane surface tension calculation model. The non-equilibrium condensation process in the Moses&Stein nozzle was simu-lated. By comparing with the experimental data, the influence of the surface tension correction coefficient on the calculation accuracy of the model was analysed. And the functional relationship between the inlet subcooling and the optimal surface tension correction coefficient was further obtained. Taking case 252 as an example, with the surface tension correction coefficient increasing from 0.9 to 1.05, the condensation position moves from 3.1cm to 4.2cm, and the optimal correction coefficient is 0.98. There is a significant positive correlation between the optimal tension correction coefficient and inlet subcooling under different working conditions. The results can provide a reference for the calculation of wet steam con-densation flow.

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