Radioactivity in water at reactor 2 at the quake-damaged Fukushima nuclear plant has reached 10 million times the usual level, company officials say.
Workers trying to cool the reactor core to avoid a meltdown have been evacuated.
Earlier, Japan's nuclear agency said that levels of radioactive iodine in the sea near the plant had risen to 1,850 times the usual level.
The UN's nuclear agency has warned the crisis could go on for months.
It is believed the radiation at Fukushima is coming from one of the reactors, but a specific leak has not been identified.
Leaking water at reactor 2 has been measured at 1,000 millisieverts/hour - 10 million times higher than when the plant is operating normally.
"We are examining the cause of this, but no work is being done there because of the high level of radiation," said a spokesman for the plant's operator Tokyo Electric Power Co (Tepco).
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