Improvement of Sodium Boiling Model in Accident Simulation

To carry out the accident analysis of Chinese Experimental Fast Reactor, total instantaneous blockage of single subassembly（in short as TIB） is selected as analyzing object. Meanwhile BE+1 experiment of SCARABEE series experiments is selected as validation experiment. During TIB simulation, two-fluid six-equation model is used in sodium boiling period, and the subassembly channel is discretized by intercrossing discretion method radially and axially. In the course of model solution, a optimizing method is put forward aiming at solving some drawback of sub-channel model, which is on the basis of Lame computation factor, and the result is validated on BE+1 experiment, which show a reasonable outcome.