The thermal stratification phenomenon widely exists in the pressurizer surge line (PSL) during the steady-state conditions and transient conditions, which could result an unexpected stress distribution. Especially, the maximum stress range is most likely to appear nearby the weld joint area on the PSL. This paper mainly focuses on the pressurizer surge line stress distribution variation caused by the weld joint. The temperature distribution and stress distribution of the surge line are calculated by using the finite element method (FEM) and finite volume method (FVM). Steady-state operating conditions are considered. The conclusion of this work is that the stress distribution is quite different from the traditional stress profile merely caused by the upper and lower temperature stratification. Moreover, the stress is much higher in the interact-area between PSL matrix and the weld joint than in any other areas.

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