Japan Says 2nd Reactor May Have Ruptured With Radioactive ReleaseBy HIROKO TABUCHI and KEITH BRADSHER
Published: March 16, 2011
TOKYO — Japan’s nuclear crisis intensified on Wednesday after the authorities announced that a second reactor unit at the stricken Fukushima Daiichi plant in northeastern Japan may have ruptured and appeared to be releasing radioactive steam.
Japanese television showed what appeared to be steam rising from reactor No. 3 at the Fukushima Daiichi plant about 10 a.m. Wednesday.
The break, at the No. 3 reactor unit, worsened the already perilous conditions at the plant, a day after officials said the containment vessel in the No. 2 reactor had also cracked.
Such were the radiation levels above the plant, moreover, that the Japanese military put off a highly unusual plan to dump water from helicopters — a tactic normally used to combat forest fires — to lower temperatures in a pool containing spent fuel rods that was overheating dangerously. The operation would have meant flying a helicopter into steam rising from the plant with potentially high radiation levels...
http://www.nytimes.com/2011/03/17/world/asia/17nuclear.html