The Research Of Two-phase Flow Model In Severe Accident Simulation

The severe accident study of nuclear power station has been one of major issues of nuclear safety for past twenty years. The severe accident belongs to the beyond design base accident, result of the accident will bring the very serious risk, so experiment research of severe accident was great limited. With the quick development of computer, computer simulation has become one of important methods in the research of severe accident, which can compensate the disadvantage of experiment. And computer simulation can do the research that experiment can not complete.In this thesis, a new idea about planning the real time simulation system of severe accident was explained. Each calculation model of MELCOR was pricked off source program, and the code was modified. The modified program was run in ASCA which belongs to the nuclear power simulation research centre in the Harbin Engineering University. At last, the system will be completed.This topic mainly modified the program of two phase flow from CVH/FL, which described the surface physics phenomenon in pool of water. That part of procedures computed the mass and the energy which transfer from the pool to the atmosphere. Pass to study the procedure, the simulation project was established, the simulation model was build up, and the simulation program was compiled. The calculated result of simulation procedure in this paper was compared with result calculated by Relap5 in the same initial circumstances, whose result is right and error is smaller. So the two phase flow model in this paper is reasonable, and the simulation procedure also is right.