西班牙斗牛士舞蹈:Plutonium, new but more hair-raising fear, fr...

来源：百度文库 编辑：九乡新闻网 时间：2024/05/08 01:55:19

Plutonium, new but more hair-raising fear, from Japan's leaking plant




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2011-3-30 11:22
Toxic plutonium seeping from Japan's nuclear plant


Plitonium found in soil at the Fukushima nuclear complex heightened alarm yesterday over Japan's battle to contain the world's worst atomic crisis in 25 years, as pressure mounted on the government to widen an evacuation zone around the plant.

Some opposition politicians blasted Prime Minister Naoto Kan in parliament for his handling of the disaster and for not widening the exclusion zone. Kan said he was seeking advice on such a step, which would force 130,000 people to move in addition to the 70,000 already displaced.

The drama at the six-reactor facility has compounded Japan's agony after the earthquake and tsunami on March 11 left more than 28,000 people dead or missing in the devastated northeast.

In a gesture of support, France said it had sent two nuclear experts to Japan to help contain the accident and French President Nicolas Sarkozy is due to visit tomorrow for a meeting with Kan.

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France is the world's most nuclear-dependent country, producing 75 percent of its power needs from 58 nuclear reactors, and selling state-owned Areva's reactors around the world.

Sarkozy will be the first foreign leader to visit since the earthquake.


Soil samples

In the latest blow to hopes authorities were getting the plant under control, operator Tokyo Electric Power Co said plutonium was found at low-risk levels in soil samples at the facility.

They believe some of the plutonium may have come from spent fuel rods at Fukushima or damage to reactor No. 3, the only one to use plutonium in its fuel mix.

Japan's Nuclear and Industrial Safety Agency said that while the plutonium levels were not harmful to human health, the discovery could mean the reactor's containment mechanism had been breached.

"Plutonium is a substance that's emitted when the temperature is high, and it's also heavy and so does not leak out easily," agency Deputy Director Hidehiko Nishiyama said.

"So if plutonium has emerged from the reactor, that tells us something about the damage to the fuel. And if it has breached the original containment system, it underlines the gravity and seriousness of this accident," he said.

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Sakae Muto, a Tokyo Electric vice-president, said the traces of plutonium-238, 239 and 240 were in keeping with levels found in Japan in the past due to particles in the atmosphere from nuclear testing abroad.


Total meltdown

"I apologize for making people worried," Muto said.

Workers at Fukushima may have to struggle for weeks or months under extremely dangerous conditions to re-start cooling systems vital to control the reactors and avert total meltdown.

On Monday, highly contaminated water was found in concrete tunnels extending beyond one reactor while, at the weekend, radiation hit 100,000 times over normal in water inside another.

That poses a major dilemma for Tokyo Electric, which wants to douse the reactors to cool them, but not worsen the spread of radiation.

Japan's nuclear safety agency said fuel rods in the plant's reactors 1, 2 and 3 were damaged and there was a high possibility of some leakage from their containment vessels.

The crisis has contaminated vegetables and milk from the area, as well as the surrounding sea. United States experts said groundwater, reservoirs and the sea all faced "significant contamination."


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A Tokyo Electric official told reporters he could not rule out the possibility that radioactive water could still be entering the sea.

Experts have said the lack of information and some inconsistent data made it hard to understand what was happening at the Fukushima plant, which appears to have moved from a
core-meltdown phase to one in which management of released radioactivity is paramount.


Pressing concern


Another pressing concern has been the health of people living near the plant. More than 70,000 people have been evacuated from within 20 kilometers of the facility.

But opposition MP Yosuke Isozaki blasted Kan for not ordering people living between 20 and 30 kilometers from the nuclear plant to also leave.

"Is there anything as irresponsible as this?" Isozaki asked.

The 130,000 people living inside the wider zone have been encouraged - but not ordered - to leave.

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Plutonium detected in soil at Fukushima nuclear plant


Environmental group Greenpeace has urged an extension of the evacuation zone while the US has recommended its citizens who live within 80 kilometers of the plant to leave or shelter indoors.

Kan, leading Japan during its worst crisis since World War II, was already deeply unpopular and under pressure to resign when the crisis began.

He repeatedly defended his decision to fly over the stricken nuclear site a day after the quake, saying it had been important to see it for himself. His spokesman denied the visit had delayed operations to cool the reactors, as some media had reported.

The crisis has also put enormous pressure on Tokyo Electric, criticized for safety lapses and a slow response. Its boss, Masataka Shimizu, has barely been seen.

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2011-3-30 11:32
Masataka Shimizu, the boss of Tokyo Electric

The government might nationalize Tokyo Electric to deal with the crisis, National Strategy Minister Koichiro Gemba said. Its shares have fallen almost 75 percent since the quake.

Japanese officials and international experts have said radiation levels away from the plant are not dangerous for humans, who face higher radiation on a daily basis from natural sources.
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