Simulation of late phase of the TMI-2 accident in SCDAP/RELAP5/MOD3.2

TMI-2 accident is more valuable than the related experiments in the point of view that it is a real accident offering huge information about the late phase of severe accident. Therefore it gives out good standards for evaluation of code performance and input's suitableness by comparing the accident data and simulated outputs. In this study SCDAP/RELAP5/MOD3.2 was selected for accident simulation. And sensitivity analysis was performed on varied cases to find out the most proper input variable about the late phase of core melting phenomena. Other plants and experimental facilities' input deck were collected and analyzed for the sensitivity study and the shortcomings proposed by SCDAP/RELAP5 Peer Review were considered to the simulation. As a result gamma heating fraction in the input affect the progress of core melting phenomena. About this a study on the related model itself will be carried out