[bluetwo]

Yes, a giant cooling system dug underneath the reactor after the accident takes water from a nearby river and pumps it out to a cooling pond where it evaporates. This keeps the concrete from melting and the core contained.

Here is a report from the International Atomic Energy Agency:

https://www-pub.iaea.org/iaeameetings/IEM4/29Jan/Voitsekhovy...

(Poor english but good diagrams)

[CamperBob2]

Nothing in that document describes a planetary-scale disaster.

[bluetwo]

The second link, posted at the same time, does.