An investigation of corium in Fukushima Daiichi Unit-1 accident.

The core melt composition resulting from the Fukushima Daiichi Unit1 Nuclear Power Plant (FD-U1) accident is essential for the corium characterization phase before decommissioning or handling of radioactive waste. Several models were applied by different research groups for the estimation of corium composition. In this paper, the investigation of the isotopic composition, and radioactivity of the radio-nuclides in the corium10 and 50 years post-accident were calculated using Monte Carlo code, MCNPX 2.