The most urgent crisis centers on the Fukushima Daiichi complex, where all three reactors are threatening to overheat, and where authorities say they have been forced to release radioactive steam into the air to relieve reactor pressure.
The complex, 240 km (150 miles) north of Tokyo, was rocked by an explosion on Saturday, which blew the roof off a reactor building. The government did not rule out further blasts there but said this would not necessarily damage the reactor vessels.
Authorities have poured sea water in all three of the complex's reactor to cool them down.
FEARS OVER OTHER REACTORS
The complex, run by Tokyo Electric Power Co , is the biggest nuclear concern but not the only one: on Monday, the U.N. nuclear watchdog said Japanese authorities had notified it of an emergency at another plant further north, at Onagawa.
But Japan's nuclear safety agency denied problems at the Onagawa plant, run by Tohoku Electric Power Co , noting that radioactive releases from the Fukushima Daiichi complex had been detected at Onagawa, but that these were within safe levels at a tiny fraction of the radiation received in an x-ray.
Shortly later, a cooling-system problem was reported at another nuclear plant closer to Tokyo, in Ibaraki prefecture.
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