on the 3 and 4, but don't forget, now the problem is no more the radioactivity released on air, but the real problem is to don't arrive to uncontrollable fusion of the fuel bar... ( the only way is to cool down the fuel bar )
As all the vessel are completelly down ( it's a bit more complicate with the reactors 4 as it's an open vessel ), the only way is to cool down the matters ( who enter in fusion in the contact with the air ),
and so don't go to a similar tcherchnobyl explosion....Whatever is the vessel is open, you need put enough water ( who evaporate in hydrogen ) for keep the bar submerged and cool..... the water can seems a " low" solution, but actually all is in the temperatures of the bar who have been push outisde the reactors ( after the earthquake, it's a securitiy system, the reactor release the bar and in the vessel who are then continuously refresh, immerged in the water, but this exactly where the problem have occur, as the all the safety system have been destroyed and bring unusable after the tsunami who have follow.... the temperature have increase and the level of Hydrogen pressure have make explode the covers of the reactors ......... )
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