[3H01-05] Accident Analysis

[3H04] Analysis of MCCI phenomena by MELCOR and SAMPSON

(4)Outline of Fuel Debris and MELCOR Analysis

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

Keywords:severe accident, cavity, fuel debris, Molten Core Concrete Interaction, coolability, MELCORv2.2

Fuel debris behavior in the cavity was expressed by fuel temperature manifold with parameters of its mass, amount of cooling water and timing, wall temperature boundary conditions. We made it possible to make a bird's-eye view of forecasts on actual severe accidents from test results. We tried to understand the phenomena in a more detailed manner from analysis by simple model and MELCOR.