Abstract：To study the influence of different positions of guide vane trailing edge on the pressure fluctuation and gas fraction fluctuation in volute wall of nuclear reactor coolant pump under gasliquid phase condition, and find a best position of guide vane trailing edge, the threedimensional numerical software CFX was used to simulate the internal transient flow field of pump, with monitoring points set in different positions, in the hope of learning pressures and gas fraction distributions at different times and different positions within each model pump. By comparing pressure fluctuations, frequency domains and time domains at the same position of each model, it was found that the pressure is lower and steadier when the guide vane trailing edge is in the center plane of volute. In another word, the vibration and noise caused by pressure fluctuation were lower; it is the best position for safety. At the same time, it was also found that the fluctuation frequency of volute wall was influenced by impeller rotation frequency. Except similar tongue, impeller rotation almost has little effect on gas fraction distribution of volute wall and outlet.
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