Archive for the ‘Timeline’ Category

What we know, and don’t know, about Japan’s reactors

In General, Timeline on March 17, 2011 at 7:36 AM


A good overall presentation about Fukushima disaster basic points.  Very interesting the detailed information on coastal defences for the nuclear power plant.




There are a total of six reactors at the Fukushima Daiichi site about 134 miles northeast of Tokyo […] These were completed between 1970 and 1978 and were of “the first vintage” of boiling water reactors — a type that represents only about a third of U.S. reactors, but 60 percent of Japan’s 54 operating reactors.


The plant site, on a straight stretch of steep coastline, is fronted by an artificial port — a set of jetties and a seawall that was supposed to protect the plant from a tsunami two meters (about six feet) high, but was easily overtopped in this case by tsunami waves that have been reported to be about twice that height. It was the tsunami that caused the major problems: it disabled the backup diesel generators […]


If the fuel does fully melt, he said, it would “relocate downward,” where it would hit a pool of water at the base of the reactor building, which is there specifically to cool off the molten fuel in case of such an emergency. When the molten fuel reaches the water, Kazimi said, it would solidify again, where it could later be carved up and removed, as was done at Three Mile Island.