The Chernobyl reactor also had no containment vessel, so the initial core failure blew a cloud of radioactive fire into the air. The Fukushima containment vesse

The Chernobyl reactor also had no containment vessel, so the initial core failure blew a cloud of radioactive fire into the air. The Fukushima containment vessel kept most of the crap in one place until it could melt into a cohesive mass.