[2C06-10] Fukushima NPP Accident 2

[2C10] Assessment of Core Status of TEPCO's Fukushima Daiichi Nuclear Power Plants

(68)A new heat transfer model for simulating Corium-Concrete Interaction in DSA module of SAMPSON code

＊Mirco Giuli¹, Marco Pellegrini¹, Masanori Naitoh¹ (1.IAE The institute of Applied Energy)

Keywords:Severe Accident scenario, MCCI, SAMPSON code, Heat Transfer Mechanism

One of the major issues raised by molten corium concrete interaction (MCCI) is how the 2D cavity ablation in an oxidic pool evolves. In order to reproduce the different ablation behavior observed for limestone and siliceous concrete during CCI-2 and CCI-3 experiments, a new heat transfer correlation was implemented in the DSA module. The new model was develop by T. Sevòn and takes into account heat conduction and gas release in and from the concrete for calculating the heat transfer coefficient (HTC). Three correlation for the bubbling-enhanced HTC were implemented. For the basemat, a single correlation can be used for siliceous and limestone concrete. For the sidewall, two different correlation are needed, for the two concrete types.