[1E08-12] Severe Accident of Fukushima Daiichi 1

[1E09] Assessment of Core Status of TEPCO's Fukushima Daiichi Nuclear Power Plants

(91)Evaluation of Debris Spreading Conditions by Plant Sensitivity Analyses

*Masataka Hidaka^1,2, Tadashi Fujii^1,2, Takeshi Sakai^1,2 (1. International Research Institute for Nuclear Decommissioning, 2. Hitachi-GE Nuclear Energy, Ltd.)

Keywords:Fukushima Daiichi Nuclear Power Plants, Severe accident, SAMPSON, Debris spreading, Concrete erosion

Reduction of uncertainty for predicting debris spreading and the long term concrete erosion of containment floor is important for debris removal at TEPCO's Fukushima Daiichi Nuclear Power Plant. The sensitivity analyses for debris spreading were performed to evaluate the effect of debris relocation conditions using the debris spreading analysis (DSA) module in the SAMPSON code. The dominant parameters for debris spreading were clarified based on the analysis results.