MPS (moving particle semi-implicit) method simulation on shock wave propagation of dam-break over a wet channel for severe accident reactor investigation

Relocation of molten corium during severe accidents of a nuclear reactor is a complex phenomenon. One of the phenomena is a spreading process of molten fuel in the core catcher. In some core catcher design, molten fuel will be directed to different room through channel. Thus, molten fuel relocation, including spreading through the channel, is the key factor in accident mitigation that has to be understood well. MPS (moving particle semi-implicit) method has been used to simulate severe accident cases due to its advantage in dealing with surface deformation. The wave propagation of fluid flow over a wet channel case was used to validate the MPS simulation. In this investigation, a 2D simulation was conducted to simulate the case. The height comparison was made for two points between the experiment and the simulation. It shows good agreement in the parameter of water level. However, MPS simulation underestimate the height of the water level that may relates to particle size.