Towards an European consensus on possible causes of MCCI ablation anisotropy in an oxidic pool

A MELCOR model of Fukushima Daiichi Unit 1 accident

“…MELCOR does not calculate heat conduction into deeper parts of the concrete, so the ablation rate is probably overestimated at the later phases of the interaction, when the heat flux from the melt to the concrete becomes so small that conduction heat flux is a significant part of it. It has been observed in experiments that concrete made of siliceous aggregates (like the basaltic concrete in Fukushima) melts much faster at the sidewall than at the basemat (Cranga et al, 2014). MELCOR does not have models for this asymmetry.…”

Heat & mass transfer and interface temperature during simulated melt-concrete interaction with composition variation in ARTEMIS 2D experiment

“…Several attempts were made to find a solution corresponding to known constraints. Michel and Cranga proposed a heat-transfer model based on thermal resistances due to a slag layer and convection (Cranga et al, 2010(Cranga et al, , 2013. Separate-effect tests with simulant materials have also been initiated to investigate the link between heat-flux distribution, viscosity and the distribution of superficial gas velocity more precisely (CLARA tests (Amizic et al, 2012;Bottin et al, 2015Bottin et al, , 2016).…”

Natural convection in wake of molten metal moving with phase change of wax

“…In the literature, several experimental and computational efforts exist investigating that phenomenon. Recent reviews reported by Foit et al (2014) and Cranga et al (2014) describe the MCCI experiments and relevant problems encountered in understanding of the phenomenon. Advancement of molten corium inside the concrete towards the lateral and vertical directions occasionally demonstrates unsymmetrical and inconsistent behaviors in the experiments (Farmer et al 2006).…”