Jim-

Your link provides a good update of the status of reactor units 1-4; it's estimated that 70% of the fuel melted down in one reactor and 30% in another.

It also refers to identifying an "8-inch crack" in the containment (pressure suppression chamber?) underneath the primary reactor containment of Unit 2, the evident source of highly radioactive water escaping into the environment. The utility workers are trying to devise a plan for plugging the crack with concrete, not an easy location to gain access to.

Charley Noble