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

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/Voitsekhovych.pdf https://www-pub.iaea.org/iaeameetings/IEM4/29Jan/Voitsekhovy... (Poor english but good diagrams)