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Closer to a possible meltdown? >> well, i just heard the news, but i can't say that was unexpected either, given that reactor number 2 was in trouble all day. and it seems to be following the same path as its companions, number 1 and 3, that core damage has lead to generation of hydrogen, which led to an explosion in the outer building, that's what i am assuming has happened, but i am not sure yet. >> again, to follow up on something lester said, he was talking about the international nuclear and radiological event scale. how do you put this thing in perspective. currently, this is being liste...

That's what happens. they go to the bottom. but i told you last night this one is different than chernobyl. this one has all of the pellets still in a pressure cooker and it's covered. it's this. this is the containment. this is a wall of concrete and steel. it's the pressure cooker. so still, if this happens, nuclear meltdown, still no damage to the people outside of the plant. experts told me today that nuclear meltdown is much better to be described as core damage. not meltdown. next one you're hearing is the china syndrome. we can thank jane fon da for this one. in jane fonda land, here is...

Your more expert eye, how worried should we be here? >> that's a good question. we're some place we've never been before. we have not had this kind of core damage. three mile island was core damage but it was in a different environment. this has gone on for days. it's been continuing struggle. nobody is quite certain about how a reactor core will behave as it gets to be more and more damaged. we're now seeing fission products and the radioactive materials that are created during operations. and that means that the fuel rods have cracked open or perhaps broken open. and the steam that they're r...

Trying to process, first of all what we're hearing from the japanese and you have some people concerned we're not getting the entire story. >> my understanding there's a third reactor, which of course, has become uncovered and suffering core damage and the issue is when they can recover that core with water. >> what we're looking at, a graphic of what is supposed to happen here. i said earlier today we expect people to be nuclear experts and honestly we are understanding the technology. tell us what went wrong and what's happening now that we're hearing highly likely we're seeing melting. >> t...

Fukushima experienced core damage. the uranium lost cool overheated and interacting now with the fuel clanning which has melted inside of the reactor and as a result that has generated a lot of the hydrogen gas and oxygen, two explosive elements. apparently the hydrogen and oxygen gas leaked out of the reactor vessel along with radio activity and filled the cavity and there are many ignition sources inside of the reactor building . it ignited . detonated with an explosion that blew a wall out of the reactor building. we are now concerned about the containment structure itself that houses all o...