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UN opens probe into Japan's crippled nuke plant

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[May 24, 2011]  TOKYO (AP) -- A major international mission to investigate Japan's flooded, radiation-leaking nuclear complex opened Tuesday as new information emerged on just how serious the crisis was in the early days after the March 11 tsunami.

The team of U.N. nuclear experts met with Japanese officials and were to inspect the Fukushima Dai-ichi plant in coming days to investigate the worst nuclear accident since Chernobyl in 1986 and assess efforts to stabilize the complex by Tokyo's self-declared deadline of early next year.

The Japanese government, which has pledged to cooperate with the experts from the Vienna-based International Atomic Energy Agency, also announced its own probe into the crisis, appointing a Tokyo academic to head an investigative panel.

The plant operator, Tokyo Electric Power Co., released new analysis suggesting that fuel rods in the plant's Units 2 and 3 mostly melted during the early days of the crisis, which had been suspected but could not be confirmed and which suggests the severity of the accident was greater than officials have acknowledged.

TEPCO announced similar findings last week about Unit 1.

Fuel in three of the plant's six reactors started melting after the March 11 tsunami knocked out cooling systems, prompting huge releases of radiation into the atmosphere. The plant is still leaking, but at much lower levels than immediately after the accident, and Japanese officials hope to bring the entire plant into "cold shutdown" -- halting all radioactive leaks -- by January at the latest.

In the meantime, 80,000 people remain evacuated from homes around the plant. Many are living in school gymnasiums, uncertain of when they will be able to return. A handful of stalwarts have defied government orders and refused to leave.

"TEPCO caused such a horrible disaster. Leaving my home means I have lost to TEPCO," said Naoto Matsumura, a 51-year-old rice and vegetable farmer who has stayed at his home despite radiation concerns and a lack of electricity and running water.

"Certainly, the life is not comfortable at all," he said. "But I will not give up."

Violators of a 12-mile (20-kilometer) exclusion zone could face fines up to 100,000 yen ($1,200) or detention of 30 days, but no officials have moved to arrest him.

The IAEA team conferred Tuesday with Japan's trade minister, whose ministry oversees the nuclear industry, and will visit Japan through June 2 before reporting to an international conference in Vienna on June 20.

Michael Weightman, leader of the IAEA team, said he hoped the world soon "can start learning the lessons from the information we gather."

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Goshi Hosono, director of the Japanese government's nuclear crisis task force, said the IAEA team submitted a "long list" of questions.

"We will do our best to answer their questions," Hosono said.

The government also said it was appointing University of Tokyo professor Yotaro Hatamura, an expert on industrial and other accidents, to head a panel of outside experts to investigate the Fukushima accident.

The crisis has raised serious questions about the lax oversight of Japan's nuclear industry and prompted the country to scrap plans to rely on nuclear power for one half its electricity needs -- up from its current one third.

The quake and tsunami, which left 24,000 people dead or missing, also damaged farms, ports and hundreds of suppliers, helping to push Japan's economy back into recession.

A clearer picture of the extent of damage at the plant emerged Tuesday after an analysis of data from Units 2 and 3 suggested that fuel rods in those two cores had almost certainly mostly melted as well.

"We have analyzed data, which showed that it was highly likely that most of the fuel rods have melted. But it is unlikely that melting fuel rods could worsen the crisis because the melted fuels are covered in water," said Takeo Iwamoto, a company spokesman.

[Associated Press; By MALCOLM FOSTER and MARI YAMAGUCHI]

Associated Press writer Shino Yuasa in Tokyo contributed to this report.

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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