[2C01-05] Fukushima NPP Accident 1

[2C04] Assessment of Core Status of TEPCO's Fukushima Daiichi Nuclear Power Plants

(62)Accident Analysis of Fukushima Daiichi Unit 3 by SAMPSON Severe Accident Code

＊Marco Pellegrini¹, Hiroaki Suzuki¹, Masanori Naitoh¹ (1.The Institute of Applied Energy)

Keywords:Fukushima Daiichi Nuclear Power Plants, Severe Accident, Meltdown, SAMPSON

The accident at the Fukushima Daiichi unit 3 has been studied extensively in the last years but still wide uncertainty exists on the employment of the operative systems. Such uncertainties reflect on the onset and progression of the core melting. In the present analysis the SAMPSON code has been applied to the whole accident in order to identify and discuss such uncertainties. The results have shown that the core melt will progress after ADS depressurization and that around 40% of the core will relocate. Such relocation is responsible for the RPV failure and transfer of the fuel debris into the pedestal.