Analysis of the critical parameters for tritiated water entrained moist gas emission from nuclear power station.

• A mathematical model is built for the prediction of operation temperature and RH of exhaust moist gas for tritiated water transportation. • The relationship between the curve of saturated moist air and the line linked atmospheric point and operation point illustrate the occurrence of condensation. • The critical temperature of the exhaust gas emit under saturation is obtained by the calculation according to the tangent line from the atmospheric point and is tangent to the fitting curve of saturated moist air. A mathematical model is built for the prediction of operation parameters for tritiated water transferred by air from nuclear reactors. Exhaust moist gas containing tritiated water vapor is emitted and diffused into the atmosphere. It should be ensuring that no condensate water formation during the mixture of exhaust moist gas and atmosphere to avoid local radiation. The occurrence of water condensation during the mixture of exhaust moist gas and atmospheric air is analyzed according to a fitting equation of saturated moist gas in a psychrometric chart. The mathematical model which predict operation temperature and RH of exhaust moist gas for certain atmospheric temperature and RH is built. The mathematical model is verified in CFD for five typical operating conditions. The effect of atmosphere temperature/RH on operation temperature and RH is analyzed. The operation strategy for tritiated water transferred by air under different atmospheric conditions is discussed and presented. [ABSTRACT FROM AUTHOR]