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That's their urgent need. what they are hoping is that they can pump water for months into these reactors and eventually cool them to the point where they can start to take apart the reactors and then use these pumps to intomb them. >> so how worried, how dangerous is this to the people, not only to live in the vicinity of these reactor, or these reactors, and in all of japan right now? >> this is a japanese radiation disaster? >> for all of the country? >> psychologically for all of the country but the health risk, they just extended it to 20 miles out. they have doubled it in the last week. ...

Building and then if it proceeds and the stuff slumps and comes together, the fuel melts and once it melts it vaporizes and stuff goes out into the air and you've just got a big hole in front of the building and, you know, you're in big trouble. >> i think the difference between the numbers i was citing and the numbers you were mentioning are the difference between what i've read inside and outside the plant. the numbers you cite which are staggering high for the workers inside the plant would that amount in your mind, what's the danger for them is that a suicide mission and the second part, w...

>> yes, there is a crack in the containment structure that. is beyond what is in three mile ilabbed. >> steve: but below chernobyl. you are talking apples oranges. in chernobyl there was graphite. >> that was a soviet extrave gansa. we'll never have that again. but people talk about what if it meltdowns as if it is's bomb going off. everyone thinks it is a bomb. if you have a meltdown. it means that the fuel melts to the bottom of the container and that's it what we are worried about is radiation release. as long as the fuel is contained and the steel structure has not rupured or broken and yo...

Welcome to the program. what they are trying to do here is make sure these fuel rods are not exposed and they are working hard and round the clock to make sure that doesn't happen. what happens if those fuel rods are exposed? >> the problem is there is not adequate cooling around the fuel rods to remove the heat. there are efforts to cool so the fuel will not meltdown. >> if that fuel melts down, what happens to the area? what happens to the northern part of the country? that is what they are fighting to avoid. >> yes. it depends what will happen in the next steps if we reach that point which ...

Radioactivity is dramatically increasing in the plant. is the only option to open it up, let the radioactivity escape into the air in order to avoid a complete melt down of that plant or explosion within that plant? >> well, the point of venting the gas that's accumulating is to prevent a catastrophic rupture of the containment. if you vent the gas through filters, then there's a possibility of eliminating radioactive to the environment. if you accumulate to a high pressure, you can get a rupture, and if there were a melt, there would be a release to the environment. whether or not the fuel me...