..what happens is that the reactor cores are going to be shut down long before any earthquakes or tsunamis. That was successful, so they avoided the situation they had in Chernobyl, where a core burned up because of an uncontrolled chain-reaction.DazBurger said:The question is... Is it needed?
But the problem is that there's typically nuclear fuel left in the reactor that needs to be cooled for a number of days to prevent damage on the reactor.. along with explosions, facility breaches, contamination of the air and water, etc. And, ultimately, damages to the core, which could cause a meltdown in the end.
So since the cooling systems that were supposed to work didn't - got damaged in the tsunami, most likely, that means cooling the reactor until the excess fuel is spent is going to be.. critical. That's why they're doing this, as well as probably flooding the reactor periodically with seawater (...have we gotten any news-reports with "explosions sighted at the plant" yet?). It's not preferable because of all kinds of reasons, but the alternative is obviously much worse.
..besides, TEPCO suddenly can't hide the magnitude of the disaster any more either. Real heroes.