This means that is in effect only being cooled by water coming in from the top of the reactor before it quickly leaks out into the containment building around it. This not only makes cooling concerns rise, but also makes it clear that the cleanup will be even harder than anticipated, because the core needs to be surrounded by water to provide radiation shielding in any future clean up efforts.

Ah, another cup of tea and maybe I'll study up some more.
We are what we repeatedly do - Aristotle