The Associated Press reported that Japanese officials denied all the water has drained and said the reactor, known as Unit 4, is stable.
Radiation at the Japanese site is fluctuating and at peak levels is life-threatening, Jaczko said.
The peak levels “would be lethal within a fairly short period of time,” he said. The pool at the plant’s Unit 3, which was in service, may be cracked and losing water, Jaczko said.
