Here's one update which indicates that water canons have been used in an attempt to refill the spent fuel pool in the damaged Unit 4 at the Fukushima 1 nuclear complex:

Problems continue to abound at Japan's Fukushima Daiichi nuclear power plant. Helicopters have been flown in, using tons of water in an attempt to cool and control the reactors which are overheating. Water cannons have pumped out 30 tons of water to cool a sizable amount of spent-fuel near the No. 3 reactor, which has been one of the notable sources for radioactive fallout in the area. At this point, housing units for reactors Nos. 1, 2, 3 and 4 have exploded or been exposed in some way, with their radioactive cores beginning to melt down, and Nos. 5 and 6 heating up. Emergency workers in the plant are working abbreviated shifts to reduce exposure to radiation, in addition to already wearing cautionary protective gear. Yukiya Amano, chief of the United Nation's International Atomic Energy Agency, is frustrated due to the death(SIC!!!!) of information, and arrived in Japan on Thursday to run an evaluation of the plant.

I believe they meant to say "a dearth of information."

Charley Noble