The "foot" is composed of (now) solid material, and sitting on a concrete pad onto which the reactor building was constructed. Around the building is the "New Safe Confinement" structure.

So no, it will not bleed out.

Fukushima might provide some insight as to how likely it is a reactor would experience a "China Syndrome" where a meltdown occurs and forms a mass that is hot enough to break through the containment systems in place through to groundwater and etc.

Fukushima was not a modern reactor with fewer safeties than most modern systems and even there with an uncontrolled meltdown the "China Syndrome" did not occur. The fuel fused to the sand at the bottom and stopped.

I'm not an industry professional but I suspect Fukushima may indicate that the likelihood of a "China Syndrome" type event is less likely than was previously thought.