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And we have only very limited information, unfortunately. so it's difficult to draw a concrete conclusion about the risk at this point. but there are certainly reasons for serious concern. >> okay. what are you most concerned? realist lick speaking, richard, given the situation as it stands right now. >> well, the important thing, the most important thing, at least at the reactor unit one at the fukushima daiichi site is that the operators are able to maintain the integrity of the containment building that surrounds the reactor. as long as the containment is -- remains intact, that means that ...

We are going to know in the next few hours whether this situation will be under control. we should know by tomorrow morning just how bad it is, if we can get the nuclear power industry to actually give us up-to-date information. >> in terms of these next few hours, and as you say, we are not going to know how this is going to resolve. best case, for the next few hours, is the evacuation, the six mile radius, thousands of people moved under very difficult circumstances, does that seem appropriate to you in terms of protecting the population there? >> that is a minimum evacuation scenario that y...

Damage, if there is a nuclear melt down and as you say, we could be looking at something as serious as chernobyl, does that make this a global disaster in addition to being a japanese disaster? >> yes, i think in a number of ways, it does. first of all, chernobyl did inject a lot of radio activity into the atmosphere and that did go around the northern hemisphere. there were certain aspects of that release we probably wouldn't see here. it was a much hotter plume and it went much higher, but i think we can expect there will be some detectible radioactivity if there were an event of that size i...

That pump water over the fuel rods to keep them cool. don't forget, they generate heat that turns into steam. to keep them k5cool, they stopp. the reactors were also swamped. it took them a long while to get third generators in the air to get water pump to keep the place cool, not before it looks like there was an overheating situation in reactor one. >> look at the cloud here. if we can have my director put that back up. any chance there's radio activity in that cloud? >> almost undoubtedly there's radioactive cesium, mildly raise yo active but probably not a lot of it. it is radioactive but ...

Long, long distances and the water that just thrusted onto the land, destroying everything in its wake. it's really heartbreaking to see this. among other things, the news agency is reporting that some radio activity may be leaking. there are concerns that this reactor may be losing its ability to adequately cool its core. our homeland security correspondent jeanne meserve is monitoring the situation for us. jeanne, japan's prime minister said earlier in the day there was no evidence of radioactive leaks. since then, there have been other reports suggesting there are concerns how dangerous pot...