Japanese military helicopters and fire trucks poured water on an overheating nuclear facility on Thursday and the plant operator said electricity to part of the crippled complex could be restored in a desperate bid to avert catastrophe.
On Thursday, the U.S. embassy in Tokyo urged citizens living within 80 km (50 miles) of the Daiichi plant to evacuate or remain indoors "as a precaution," while Britain's foreign office urged citizens "to consider leaving the area."
The latest warnings were not as strong as those issued earlier by France and Australia, which urged nationals in Japan to leave the country. Russiasaid it planned to evacuate families of diplomats on Friday, and Hong Kong urged its citizens to leave Tokyo as soon as possible or head south.
Japan's government has told people within 30 km (18 miles) of the plant to stay indoors.
At its worst, radiation in Tokyo has reached 0.809 microsieverts per hour this week, 10 times below what a person would receive if exposed to a dental x-ray. On Thursday, radiation levels were barely above average.
But many Tokyo residents stayed indoors, usually busy streets were nearly deserted and many shops were closed. At the second-floor office of the Tokyo Passport Center in the city's Yurakucho district, queues snaked to the first floor.
"Since yesterday we have had one-and-a-half times more people than usual coming to apply for a passport or to enquire about getting one," said Shigeaki Ohashi, a passport official.
SNOW COMPOUNDS MISERY FOR TSUNAMI SURVIVORS
The plight of hundreds of thousands left homeless by the earthquake and tsunami worsened following a cold snap that brought heavy snow to worst-affected areas.
Supplies of water and heating oil are low at evacuation centers, where many survivors wait bundled in blankets.
About 850,000 households in the north were still without electricity in near-freezing weather, Tohuku Electric Power Co. said, and the government said at least 1.5 million households lack running water.
"It's cold today so many people have fallen ill, getting diarrhea and other symptoms," said Takanori Watanabe, a Red Cross doctor in Otsuchi, a low-lying town where more than half the 17,000 residents are still missing.
The National Police Agency said it has confirmed 4,314 deaths in 12 prefectures as of midnight Wednesday, while 8,606 people remained unaccounted for in six prefecturesWashington and other foreign capitals expressed growing alarm about radiation leaking from the earthquake-shattered plant, 240 km (150 miles) north of Tokyo. The United States said it was sending aircraft to help Americans leave Japan."The situation continues to be very serious," International Atomic Energy Agency chief Yukiya Amano told reporters at Vienna airport as he left with a group of nuclear experts for Japan.
Workers were trying to connect a 1-km (0.6-mile) long power cable from the main grid to restart water pumps to cool reactor No. 2, which does not house spent fuel rods considered the biggest risk of spewing radioactivity into the atmosphere.
One official from the plant operator told a late night briefing the cable could be connected within hours. Other officials said it was unclear if water pumps at reactor No. 2, which sustained less damage from a series of explosions, would work.
U.S. officials took pains not to criticize Japan's government, but Washington's actions indicated a divide with its close ally about the perilousness of the world's worst nuclear accident since the Chernobyl disaster in 1986.
The top U.S. nuclear regulator said the cooling pool for spent fuel rods at reactor No.4 may have run dry and another was leaking.
Gregory Jaczko, head of the Nuclear Regulatory Commission, told a congressional hearing that radiation levels around the cooling pool were extremely high, posing deadly risks for workers still toiling in the wreckage of the power plant.
"It would be very difficult for emergency workers to get near the reactors. The doses they could experience would potentially be lethal doses in a very short period of time," he said in Washington.
Japan's nuclear agency said it could not confirm if water was covering the fuel rods. The plant operator said it believed the reactor spent-fuel pool still had water as of Wednesday, and made clear its priority was the spent-fuel pool at the No.3 reactor.
On Thursday morning alone, military helicopters dumped around 30 tonnes of water, all aimed at this reactor. One emergency crew temporarily put off spraying the same reactor with a water cannon due to high radiation, broadcaster NHK said, but another crew later began hosing it.
Health experts said panic over radiation leaks from the Daiichi plant was diverting attention from other life-threatening risks facing survivors of last Friday's earthquake and tsunami, such as cold, heavy snow in parts and access to fresh water.
Inside the complex, torn apart by four explosions since a 9.0-magnitude earthquake and tsunami hit last Friday, workers in protective suits and using makeshift lighting tried to monitor what was going on inside the six reactors. They have been working in short shifts to minimize radiation exposure.
The latest images from the nuclear plant showed severe damage after the blasts. Two of the buildings were a mangled mix of steel and concrete.
"The worst-case scenario doesn't bear mentioning and the best-case scenario keeps getting worse," Perpetual Investments said in a note on the crisis.
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