Due to concrete interaction with fibres, a cracked section is able to carry a significant portion of tensile stresses, called the residual stresses.
As a result, molten core falls into cavity and molten core concrete interaction (MCCI) occurs, releasing a large mass of hydrogen.
The main reason for that is a complex issue of quantifying the tensile stresses, called as residual stresses (σfr), which a cracked section is able to carry due to concrete interaction with fibers.
Heat transfer directly governs the ablation velocity of concrete in case of molten core concrete interaction (MCCI) and, consequently, the time delay when the reactor cavity may fail.
High temperature core corium quickly broke the relatively thin containment vessel wall, and was discharged to the containment pool floor, leading to the molten corium concrete interaction.
From the risk and accident management point of view, phenomenological analysis was mainly focused on (a) the level of the coolant, (b) the cladding temperature, (c) the mass of hydrogen generated during accident progressions, and (d) MCCI (Molten Corium Concrete Interaction).
LAVA and THEMA estimations of the substrate temperatures, which are the initial conditions for longer term Molten Core Concrete Interaction or Corium Ceramic Interaction computations, are also close to the measured data, within the experimental uncertainties.
These facilities are being used to investigate core melt scenarios from the beginning of core degradation to melt formation and relocation in the vessel, possible melt dispersion to the reactor cavity, and finally corium concrete interaction and corium coolability in the reactor cavity.
They contemplate nature as a harmonious spherical whole: a κόσμος, and hardly concern themselves with concrete interactions with real nature (Zwart 2009).
In other words, functional states are brain states, which are insensitive to the outer world and to the individual's concrete interactions with it.
Working on these discrete, concrete interactions is attractive because the problem is usually obvious and it's clear what to change and what will benefit the customer and the business.
