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[ audio interruption ] around the plant. the plant is not entirely sure where exactly the leak is coming from, whether it's coming from the cooling system or coming from within that. because the workers can only go in at 15 minutes at a time, it makes at it slow protest. we hear from the petco officials, that is the utility company managing the plant, saying that the radioactive substances are in reactor water at all four of the troubled reactor plants now. suggesting that fuel rods have been either exposed or damaged. they have to contain that. at the moment, they deal with the cooling crisis...

Right away, and it wasn't even noticed, wasn't noticed to the electrical grid. but the diesel backup generators were able to handle the problem and also during the 2003 blackout, they also had to turn those backup diesel generators to keep those nuclear rods cooled. that's the essential thing here. the pumps run by electricity, circulate water, keep the rods cool. otherwise they can evap wait the wat evaporate the water in the pools and there is potential for the melt ju meltdown like we have seen in japan. fortunately nothing like that has happened here. >> thank you, allan. president obama...

Serious questions remain about how japan is handling the nuclear reactor crisis. anderson cooper's in tokyo, has the japanese government or power company provided any additional information to clear things up? >> reporter: it sounded like the iaea had had one step forward, reporting power had been restored. power had been connected to reactor number two. tepco, the company that runs the reactors, said the iaea report is not true. they are trying to restore power to reactor number two. ultimately they're going to try to restore power to reactor number two. that's what started this cascade of pr...

Like this are now sticking out. they are in open air, which means they are reacting and spewing radiation into the air, and experts point out if there is a hole no matter how much water you stick back in you're still not going to be able to keep those rods cool. if there is a hole because of radiation you can't fix it. that means they talk about that chernoble solution where they go in and drop tons antons of sand and concrete because it's a catch-22 because experts say you can't really dump the sand in the concrete becaus before you t cooled, it would melt the glass and compromise the concret...

Rods cool, the water would also have a shielding effect on the radioactivity as well. but if the pools are destroyed or empty or leaking or if the water in them is heating up to the point where it may boil off, then the fuel rods in those pools will heat up and start to break down and they will release their radioactivity and it will go into the air. and that may be what has already happened. that may be the cause of the levels of radioactivity at daiichi now that are described as extremely high. radioactivity levels in the air above these karmic mccarthy meets mad max destroyed reactor buildi...