Nuclear Meltdown

More smoke rises from Japan's crippled nuke plant

(Agencies)
Updated: 2011-03-18 14:04

An aerial view taken from a helicopter from Japan's Self-Defence Force shows damage sustained to the No 4 reactor (C) at the Fukushima Daiichi nuclear power complex in this handout taken March 16, 2011 and released March 17, 2011. [Photo/Agencies]

YAMAGATA, Japan - Smoke billowed from a building at Japan's crippled nuclear power plant Friday as emergency crews worked to reconnect electricity to cooling systems and spray more water on overheating nuclear fuel at the tsunami-ravaged facility.

Related readings: Mistakes, misfortune, meltdown: Japan's quake  Japan hopes to restore power at 2 crippled reactors  It is time for Japan to call for sacrifice  Help the survivors in Japan

Four of the troubled Fukushima Dai-ichi plant's six reactor units have seen fires, explosions or partial meltdowns in the week since the tsunami. While the reactor cores where energy is generated are a concern, water in the pools used to store used nuclear fuel are also major worries. Water in at least one fuel pool- in the complex's Unit 3- is believed to be dangerously low, exposing the stored fuel rods. Without enough water, the rods may heat further and spew out radiation.

"We see it as an extremely serious accident," Yukiya Amano, the head of the UN's International Atomic Energy Agency, told reporters Friday just after arriving in Tokyo. "This is not something that just Japan should deal with, and people of the entire world should cooperate with Japan and the people in the disaster areas."

Frantic efforts were made Thursday to douse a number of units with water, and authorities were preparing to repeat many of those efforts.

Friday's smoke came from the complex's Unit 2, and its cause was not known, the nuclear safety agency said. An explosion had hit the building on Tuesday, possibly damaging a crucial cooling chamber that sits below the reactor core.

Last week's 9.0 quake and tsunami in Japan's northeast set off the nuclear problems by knocking out power to cooling systems at the reactors. The unfolding crises have led to power shortages in Japan, forced auto and other factories to close, sending shockwaves through global manufacturing and trade, and triggered a plunge in Japanese stock prices.

Low levels of radiation have been detected well beyond Tokyo, which is 140 miles (220 kilometers) south of the plant, but hazardous levels have been limited to the plant itself. Still, the crisis has forced thousands to evacuate and drained Tokyo's normally vibrant streets of life, its residents either leaving town or holing up in their homes.

The Japanese government has been slow in releasing information on the crisis, even as the troubles have multiplied. In a country where the nuclear industry has a long history of hiding its safety problems, this has left many people- in Japan and among governments overseas- confused and anxious.

"I feel a sense of dread," said Yukiko Morioka, 63, who has seen business dry up at her lottery ticket booth in Tokyo. "I'm not an expert, so it's difficult to understand what's going on. That makes it scarier."

A senior official with the UN nuclear agency said Thursday there had been "no significant worsening" at the nuclear plant but that the situation remained "very serious." Graham Andrew told reporters in Vienna that nuclear fuel rods in two reactors were only about half covered with water, and they were also not completely submerged in a third.

Edano said Friday that Tokyo is asking the US government for help and that the two are discussing the specifics.

"We are coordinating with the US government as to what the US can provide and what people really need," Edano said.

At times, the two close allies have offered starkly differing assessments over the dangers at Fukushima. US Nuclear Regulatory Commission Chairman Gregory Jazcko said Thursday that it could take days and "possibly weeks" to get the complex under control. He defended the US decision to recommend a 50-mile (80-kilometer) evacuation zone for its citizey that the company has been unable to get information such as water levels and temperatures from any of the spent fuel pools in the four most troubled reactors.

Workers have been dumping seawater when possible to control temperatures at the plant since the quake and tsunami knocked out power to its cooling systems, but they tried even more desperate measures on Units 3 and 4.

On Thursday, military helicopters dumped thousands of gallons of water from huge buckets onto Unit 3, and also used military firefighting trucks normally used to extinguish fires at plane crashes.

Officials announced Friday they would not continue with the helicopter drops - televised footag personnel in the cities of Tokyo, Yokohama and Nagoya.