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On reporting this the past few days, is the internal containment vessel around the reactor, there is also a secondary containment vessel which is in effect the building that surrounds the entire reactor complex. for us to have had a significant radiation leak into the environment, does that mean officials are saying both of the containment units have been breached, both the outer building and smaller containment vessel around the dome? >> that's a good question, not clear at all, and not clear the smallest has been breached yet. because the core nuclear material in there which had been an on-g...

Rachel? >> bob, to be clear, what we have on site at these facilities, we learned so much on reporting this the past few days, is the internal containment vessel around the reactor, there is also a secondary containment vessel which is in effect the building that surrounds the entire reactor complex. for us to have had a significant radiation leak into the environment, does that mean officials are saying both of the containment units have been breached, both the outer building and smaller containment vessel around the dome? >> that's a good question, not clear at all, and not clear the smalles...

We had four to six reactors in trouble there. here's what we know so far. the top u.s. regulator presented a grave assessment of the crippled reactor before congress today. he said the skeletal crew of emergency workers may be subjected to lethal doses of radiation that could keep them from servicing the complex and preventing a full blown meltdown. the primary concern is on ç reactor 4 with a spent fuel pool. that's up at the top. it is believed to have boiled dry, emitting high levels of radiation there. they're also worried about the spent fuel pools in number 2, four other reactors in fa...