Simulation of IBIF in HWR Horizontal Fuel Channel

In this paper,the phenomenon of Intermittent Buoyancy Induced Flow（IBIF） in the heavy water reactor（HWR） fuel channel is simulated.The IBIF phenomena and the fuel bundle temperature are analyzed.The calculation results indicate that the fuel bundle temperature rises and falls periodically accompanying with the periodical initiation,grow and discharging of the bubble from the channel;the bubbles dis-charge from the two opening on the two sides alternately which removes the decay heat of the fuel bundles,and consequently the temperature of fuel bundle keeps low relatively.