NHK...

An official of Japan's nuclear safety agency has suggested that a nuclear fuel meltdown at one of the damaged Fukushima reactors means that filling the reactor's container with water may be meaningless.

Hidehiko Nishiyama told reporters on Friday that melted rods at the bottom of the No. 1 reactor are being cooled by a small amount of water.

He said he doubts that it's necessary to flood the containment vessel entirely, as the plant operator has been trying to do.

The operator, TEPCO, said on Thursday that most of the fuel rods in the reactor are believed to have melted and sunk to the bottom of the reactor's pressure vessel.

TEPCO says the melted fuel has apparently cooled, even though much of the injected water is leaking through holes at the bottom of the vessel.

Under a plan decided last month, the utility was to fill up the containment vessel with water and set up a system to circulate the water through a heat exchanger.

Nishiyama said TEPCO need only inject water to a height that would allow the system to work.

He said the utility will likely change its strategy and inject water to the minimum necessary level.

Friday, May 13, 2011 16:08 +0900 (JST)
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There are other articles there and elsewhere re highly radioactive shit leaking into the water table and ocean at 20,000 times the "limit"... etc. Nasty stuff.