All three Fukushima I reactors are probably in advanced meltdown

This is essentially what a spokesman from the US Nuclear and Industrial Safety Agency (NISA)  has confessed to The New York Times on condition of anonymity. It is a practical certainty for reactor no. 2 and it is very likely for reactors no. 1 and 3.

According to this source, the extremely high radiation detected several days ago in the water poured in the drywell clearly indicates that the melted core has breached the reactor encasement. 

It is noticeable that some of the radiation measures in reactors 1 and 3 are very similar, so there are all reasons to believe that we are before three Chernobyls in one (not counting the equally dangerous spent fuel stored in empty pools, which has also reached criticality and is in any case extremely radioactive without need of any further complications).

It is possible that not all three melted cores have fully breached the reactor containers but any breach can only get bigger because of radioactive erosion. 

This multiple Chernobyl, as mentioned several times before, has the additional problem of being right beside the Ocean, what makes almost impossible to contain the radioactivity, as it will almost unavoidably leak to the sea via the ground, much less with any prospect of stability, as the area is a demonstrated earthquake nightmare, where any human construction is bound to collapse sooner or later.

My understanding is therefore that the situation is as bad as it can be. I cannot think of any viable solution. Even encasing all six reactors looks only like a mere bandage with no guarantee of results in either the short nor the long run.


Update (Apr 9): very worrisome sudden temperature and radiation rise after Thursday's earthquake. Both measures have skyrocketed in reactor no. 1. (ENews)