Transient Thermal-hydraulic Characteristics Analysis of Air-Cooling Residual Heat Removal System based on CFD

抄録

In order to evaluate the safety performance of microreactor air-cooling residual heat removal system and provide reference for the subsequent experimental design of microreactor air-cooling residual heat removal system. A two-dimensional simplified model of microreactor air-cooling residual heat removal system was established based on CFD software. The steady-state calculation and transient numerical simulation of reactor startup and shutdown and station black-out (SBO) accident were carried out. By analyzing the temperature field, velocity field distribution, residual heat removal capacity, structural temperature distribution and natural convection characteristics in the transient process in the system, the following conclusions are obtained: It takes about 50s for the system to establish the natural circulation initially when the reactor is started. When the SBO accident occurs, the system can change from forced ventilation condition to the natural circulation condition in a short time to ensure the long-term cooling of the microreactor. The air-cooling residual removal system can operate normally and remove the decay heat after the reactor shutdown.