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So far what has been found by the American teams that are on-site there is that NO reactors have been damaged - most of them didnt have fuel in them anyway at the two sites the news has been covering.
The real issue is that the fuel they took out of those reactors some time ago has to sit in pools called spent fuel pools to keep them covered.
At one plant the spent fuel pool was damaged and all water is gone out of the pool (including the boron that is normally in the pool dissolved in the water) and they have no way to get any water back into it right now - there is no fire associated with that.
A second spent fuel pool is looking like it also was damaged and lost its water - but that is not certain yet.
The explosions and fires that have reduced the other buildings to rubble are not the reactor buildings - they are called auxiliary buildings and house the backup equipment on the outside of the reactor building.
All reactor buildings are intact with the exception of the one above that has no water in the spent fuel pool - that building has lost its last boundary and the dose rates from direct radiation from the fuel is very high.
The US NRC did take the precautionary step of evacuating all US citizens for 50 miles outside the confirmed damaged aux building today.
Remember also that the news is talking about nuclear plants without even telling anyone that this is actually two different sites in different cities
The fires after the hydrogen explosions (gas explosions which are non-radioactive) have been caused by the flammable oil storage tanks and the oil in the pumps being used to try to get water to the spent fuel pools.
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