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Under control there are two plants that might release steam. is that reassuring or sound incomplete? >> there have been nor developments in last half hour or so. we knew scenes from one plant has been released from a couple hours ago. the company, tesco has now announced that they've, four further reactors are starting to vent steam into the environment. any time you have radio activity have you a nuclear accident. the steam that as far as we understand is at moment being released is not particularly radio active. and it's unlikely to cause serious damage to people or the environment. and this...

Reactor. we hope that is the case. another report says that the ceiling of the reactor building has collapsed. that is what the explosion was. whatever it is, it is causing problems for those people who are trying to bring the reactor core under control. we know what the situation is. there are at least, there is some damage and some of the core has been exposed to air and the coolant level has fallen. and there has been a release of radio activity that could only come from the reactor. they are trying to prevent a meltdown. this is already right now the second worst nuclear accident if histor...

We don't have an independent assessment or structural damage. this never happened before. three mile island and we had almost melt down and partial melt down it was internal control and this is caused by earthquake and tsunami in the country and there may be structural problems that prevent us from controlling the reaction inside of the nuclear reactors or the other ones. >> worst case scenario. radiation leak in the atmosphere, how does it impact the immediate area and then the rest of the world in >> sure. best case they control it and what we are talking about sprenting of radio activity. t...

>> with the after shocks that are taking place near that site. 6.one and others and higher. >> that's a big earthquake. >> what will that do to the effort to contain this thing in >> it will make it harder. if you are standing there and you are a worker and you are pumping sea water and everything starts to shake. you naturally retreat and not just intutitty and insinctiively. logisticallyy you can't keep power going to the putches and you can't cipe the nozzle aimed and you are not where there is a safe place to stand and operate. the problem gets really, really complicated and the trouble wi...

Significant releases of radio activity from the plant. that is much more likely as long as the operators can be sure that the containment remains intact. >> richard, when people think about nuclear meltdowns, people think of chernobyl. is this situation akin to chernobyl or are we not there yet? is there potential for it to be like chernobyl? >> i don't think chernobyl is the most helpful analogy here. i think perhaps a more helpful analogy, not a reassuring one, but more helpful is the three-mile island nuclear reactor which suffered a partial meltdown in 1979 here in pennsylvania. the fuel i...