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March 14, 2011

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Race to combat threat of nuclear meltdowns

JAPAN'S nuclear crisis intensified last night as authorities raced to combat the threat of multiple reactor meltdowns and more than 170,000 people evacuated the northeastern coast after fears spread over possible radioactive contamination.

Nuclear plant operators were frantically trying to keep temperatures down in a series of nuclear reactors - including one where officials feared a partial meltdown could be happening yesterday - to prevent the disaster from growing worse.

Chief Cabinet Secretary Yukio Edano also said yesterday that a hydrogen explosion could occur at Unit 3 of the Fukushima Dai-ichi nuclear complex, the latest reactor to face a possible meltdown. That follows a blast the day before in the power plant's Unit 1, and operators attempted to prevent a meltdown there by injecting sea water into it.

"At the risk of raising further public concern, we cannot rule out the possibility of an explosion," Edano said. "If there is an explosion, however, there would be no significant impact on human health."

More than 170,000 people have been evacuated as a precaution, though Edano said the radioactivity released into the environment so far was so small it didn't pose any health threats.

"First I was worried about the quake," Kenji Koshiba, a construction worker who lives near the plant. "Now I'm worried about radiation." He spoke at an emergency center in Koriyama town near the power plant in Fukushima.

Edano said none of the Fukushima Dai-ichi reactors was near the point of complete meltdown.

A complete meltdown - the collapse of a power plant's ability to keep temperatures under control - could release uranium and dangerous contaminants into the environment and pose major, widespread health risks.

A Japanese official said there were 190 people within a 10 kilometer radius of the nuclear plant when radiation levels rose and 22 people have been confirmed to have suffered contamination. Workers in protective clothing were scanning people arriving at evacuation centres for radioactive exposure.

Up to 160 people, including 60 elderly patients and medical staff who had been waiting for evacuation in the nearby town of Futabe, and 100 others evacuating by bus, might have been exposed to radiation, said Ryo Miyake, a spokesman from Japan's nuclear agency. The severity of their exposure, or if it had reached dangerous levels, was not clear. They were being taken to hospitals.

Edano said operators were trying to cool and decrease the pressure in the Unit 3 reactor, just as they had the day before at Unit 1.

The UN nuclear agency said last night that Japan had declared a state of emergency at another earthquake-affected nuclear plant where higher-than-permitted levels of radioactivity were measured.

The International Atomic Energy Agency said Japan told it that the source of the radioactivity at the Onagawa power plant is being investigated. It said all three reactors at the plant were under control.



 

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