Analysis of Thermal Stratification Effect in Surge Line of Pressurizer in Nuclear Power Plants

In this paper, the numerical simulation of the three dimensional flow fields is performed for the surge line of the nuclear power plant. The simulation incorporates the coupling effect between the solid pipes and the liquid coolant and the conjugate effect between the heat transfer and fluid flow. The basic structures of the flow field and the temperature distribution are obtained in the surge line under designed heat-up transient. Furthermore, the stress analysis Finite Element Analysis（FEA） model is established according to the structure features of the surge line.The model is used for the stress analysis of the surge line under corresponding transient.