Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
The low temperature pool heating reactor is a small reactor operating at low temperature and low pressure, and the maximum temperature of the coolant does not exceed the saturation temperature under the corresponding pressure. Because it is mainly used in people 's life heating, the system design has high inherent safety. The natural circulation valve is the key equipment of the passive residual heat export system of the ' Yanlong ' low temperature pool heating reactor of the China Nuclear Group. The performance of the natural circulation valve directly affects the normal export of the residual heat of the reactor under accident conditions. Therefore, the reliability of the natural circulation valve design and the stability of the work are related to the safety and stability of the reactor. The natural circulation valve is passively opened when the main pump fails, in order to explore the flow field changes of the reactor core and the pool during the opening process ; effect of different natural circulation valve diameters on coolant outlet in core. In this paper, the overlapping grid method is used to simulate and analyze the opening behavior of the natural circulation valve, and the velocity field of the core and the pool during the opening process of the natural circulation valve, the flow change of the natural circulation valve flow channel and the inlet and outlet of the primary circuit are obtained. The velocity field and the mass flow rate at the inlet and outlet of the core are compared, and the influence of the diameter of the natural circulation valve on the flow field of the reactor and the pool is analyzed. From the perspective of qualitative and quantitative analysis, the reliability of the natural circulation valve in the low temperature pool heating reactor is verified, and the safety of the natural circulation valve device is verified, which provides a reference for the optimal design of the natural circulation valve.
