[2B01-05] Light Water Reactor Behavior Under Accident Conditions 2

[2B01] Analysis of MCCI phenomena by MELCOR and SAMPSON codes

(1)Study on Debris Behaviors focused on Flow and Radiation immediately after Falling onto Cavity Floor

*Masashi Himi¹, Koetsu Ito¹, Yoshihiro Ide¹, Hidetoshi Morita¹, Koichi Nakamura² (1. Advancesoft co., 2. CRIEPI)

Keywords:severe accident, debris, corium-concrete interaction, debris spreading, viscosity

In the severe accident, the fuel debris flows and diffuses according to the viscosity immediately after falling from the reactor vessel to the cavity floor. Its temperature varies depending on the decay heat and the radiation mainly. We examined how the mass of fuel debris relates to the debris flow and the change in temperature.