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Detailed text transcripts for TV channel - CNN - 20110314:14:07:00

now, outside the reactor and steam released, there is radioactive materials, but less harmful. the government has stressed, though, the radiation levels have been steadily coming down in recent days. but when you have ongoing crisis like this, when you have more steam being released into the atmosphere, then those radiation levels will have to be tested again and possibly we could see a spike in them. >> stan grant, thank you so much. american troops off of japan's shore have been exposed to radiation, at least 17 u.s. navy helicopter crew members had to be treated for it. now part of the american fleet has moved farther out to sea. i was talking to stan about that a moment ago. they reportedly, the uss ronald reagan reportedly headed through a radioactive cloud. chris lawrence joining us live now. do you have any word from the pentagon about exactly what happened? >> yeah, we do, carol. basically they were in this aircraft, and the aircraft flew

Government , Reactor , Radiation-levels , Crisis , Materials , Radiation , Steam , Stan-grant , Didnt-japan , American , Us-navy , Atmosphere

CBS Evening News With Russ Mitchell-20110314-01:18:00

brega, the road towards benghazi seemed lightly defended as well. there is nothing the rebels with their light weapons can do to stop the qaddafi advance. the arab league has called for a no-fly zone, but for those anti- qaddafi forces it may already be too late. >> i expect he will kill people today. he will kill a lot of people. we don't have heavy weapons. >> reporter: this is the furthest point of advance of the anti-qaddafi rebels. the town of ajdabiyah. the only evidence they were here is a shot-up police station they had presumably occupied. the town itself is completely empty. the only sign of this conflict are some celebrating pro qaddafi soldiers. these are trophy towns the regime is now showing off. dusty places full of flattened buildings where the rebel positions once were. a libyan army spokesman today said benghazi is next, but that a major assault won't be needed.

Text , Font , Geology , Signage , Organism , Phenomenon , Line , World , Ecoregion , Atmosphere-of-earth , Mammal , Map

Detailed text transcripts for TV channel - CNN - 20110314:16:15:00

don't believe that they do. the water comes in from the ocean and it cools the very hot reactor. they boil call to boil water, the water boiling into steam, the pressure turns into a generator, the generator makes power and it goes into your house. we're not burning coal here. we're burning uranium 235. so as it burns, it's cooled by the water here, it comes back in and goes around again. it goes around and around and again and never stops. unless you have an earthquake and a tsunami. this pump stopped. this water in here stopped. therefore everything else in here stopped. the reaction stopped and there's all this residual heat, and it could take 100 days for these rods to literally cool down. 100 days. three months. and they lost water to this

Water , Reactor , Ocean , Wind-power , Pressure , Steam , House , Generator , Coal , Uranium , Water-boiling , 235

Detailed text transcripts for TV channel - CNN - 20110314:07:04:00

let's just take a moment to explain how this type of nuclear power plant works. the animation you see here is produced by the u.s. nuclear regulatory commission, and is not an exact replica of the fukushima plant. it's an illustration of the type of plant the fukushima one. now first, the core inside the reactor vessel on the left-hand side of the graphic. that's what creates the heat. very pure water flows through the reactor, gets heated, and that produces a steam water mixture. now the steam line directs the steam to the main turbine, which then turns the turbine generator which produces the electricity. the unused steam goes into the condenser where it's condensed back into water and it goes back into the system. with more on what the earthquake has done to japan's nuclear reactors, you can go to our website. we posted answers to a number of questions on that. it's there at cnn.com. okay. i believe now we can go to our

Us- , Type , Works , Nuclear-plant , Replica , Animation , Fukushima-plant , Nuclear-regulatory-commission , Water , Plant , Reactor , Fukushima-one

Detailed text transcripts for TV channel - CNN - 20110314:17:23:00

pumping sea water in. then that water boils, it causes steam, they go to release the steam, and in releasing the steam, hydrogen builds up in the building and then later explodes. that doesn't compromise the containment vessel and we can talk about that, randy, it is another consequence of what's happening here. they have to keep it cool, they have to put the water in, when they put the water in, they have to let some out and when they let the water out, they get a buildup and an explosion. >> we keep hearing radiation, people are being exposed to radiation. can you put that in context, can you compare it to anything in our daily lives, like a medical cat scan or something like that. >> that's a great question. because everyone lumps the notion of radiation in one big pot. radiation is many things and not all radiation is harmful. there's gamma radiation, x ray

Boiling-water , Building , Sea-water , Steam , Doesn-t , Hydrogen , Containment-vessel , Consequence , It-cool , Water-out , Randy , X-ray-radiation

Detailed text transcripts for TV channel - CNN - 20110314:20:21:00

explosions. that was already bad enough and reactor number two, some of the fuel rods were exposed, okay. i didn't know what that meant. i asked jim walsh what are the implications of fuel rods being exploded, and this is what he told me. >> what they mean when they say fuel rods are exposed, they are suggesting that the water in the plant, those fuel rods are covered in water and that the water had drained out, well, in this case had been boiled out because the rods are hot so the water boils, turns into steam and the water level declines and declines and then at some point those rods are exposed to the air, and when they are exposed to the air, that's when the rods begin to melt or begin to be compromised. they are covered in metallic cladding which begins to melt, and that's a partial meltdown. >> all right. a partial meltdown is when you have some -- >> partial. >> right, some level of meltdown of the uranium, and then the question is how much of the radiation, how much of these nauseous particles make it north air and then it's not. so many shades of gray in this.

Number , Nuclear-reactor , Explosions , Fuel-rods , Jim-walsh , Implications , Two , Isnt-water , Plant , Water-level , Rods , Case

Detailed text transcripts for TV channel - CNN - 20110314:22:07:00

it's been good at times, at other times they've had the water level drop and had them exposed and the heat has been building up. the whole issue here is you have a bidup of steam which you have to release in some fashion. that will automatically release some sort of radioactivity into the environment. is the question is how much, does it pose a real threat. right now they're saying pretty much not. but if they can't get this heating under control, if this goes further, then you start looking at a meltdown. there's talk already there's some degree of a meltdown happening inside. it doesn't seem like anyone really knows what's happening inside this unit. but if these rods start melting, they move up to around 2200 degrees with the heat they produce. uranium rods melt at about 2100. the concern is that eventually they could collapse entirely and if the containment building fails as the backup systems have faced, then you could have a

Times , Issue , Heat , Steam , Water-level-drop , Fashion , Bidup , Question , Meltdown , Sort , Heating , Threat

Detailed text transcripts for TV channel - CNN - 20110314:13:29:00

are. the rods get so hot they boil quickly and let off steam. the steam travels through pipes and go through turbines. the energy goes out. the steam gets into an area that cools it. the lakes and oceans that is cooling this chamber and condenses the water and the system goes around and around. when the power is shut out, the cooling water never gets to the rods and that is causing the overheating. the extent these plants are overheating or melting down, i can't speak specifically, but it is a scary notion of what would happen if it overheats or go through containment walls. >> the plants you showed, there is no real risk of an earthquake occurring here? >> the new madrid zone is one of the largest we have seen in the

Area , Steam , Energy , Rods , Pipes , Turbines , Water , Power , System , Lakes , Overheating , Cooling-water

Detailed text transcripts for TV channel - CNN - 20110314:22:06:00

down the process of reaction here. it doesn't stop it entirely but it slows it down a good bit. there's still heat being given off. this is the way it would normally work. you have pumps putting water into it. that goes through it, carries the heat away. steam is released. but that failed. so a backup system came in. they starred pumping in water from another source from a generator, but the talk about power and fuel, this failed. we're not entirely sure why. may have had something to do with the tsunami. so they went to i an third system to try to bring extra cooling in. that has also had problems. as a rut, the heat has copied to build. that's been partially related to the explosions we've seen there. all of these systems are backup systems theoretically going to keep it from reaching this point. now for this particular reactor as the heat copied to build, they started pumping in sea water from below to try to keep this cooled down. that has been relative success.

Water , Wouldn-t , Weigh , Doesn-t , Bit , Reaction , Process , Nuclear-power , Fuel , Heat , Talk , Source

Detailed text transcripts for TV channel - CNN - 20110314:02:40:00

we can't speculate what that may be from reactor number 1 although there is a hydrogen there, and they were expecting it at night and jim made the salient point at reactor number 1, it was nothin reactor itself, in the outer wall containing the reactor and that's what authorities are saying, they're expecting explosion in reactor 3 but in the outer casing that holds the reactor. interestingly, too, when they were venting steam from the reactor, that's when some of the radiation seeped into the atmosphere. authorities were keen to stretch they were not at a level that would be physically harmful but it led to stretching the zone.

Reactor-3 , Hydrogen , 1 , Point , Authorities , Saying , Jim-walsh , Wall , Nothin-reactor-itself , Explosion , Some , Casing