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http://edition.cnn.com/2011/WORLD/asiapcf/03/14/japan.nuclear.reactors/index.html?hpt=T1


Tokyo (CNN) -- Another reactor at Japan's Fukushima Daiichi nuclear plant lost its cooling capabilities Monday, a government official said.
The problem was detected in the plant's No. 2 reactor Monday afternoon after an explosion rocked the building containing the plant's No. 3 reactor, Chief Cabinet Secretary Yukio Edano told reporters.
"We think that the hydrogen explosion in (the building housing) reactor No. 3 caused the cooling system of reactor No. 2 to stop working," Edano said.
Water levels were falling and pressure was building up inside the No. 2 reactor, he said, and officials were working on a plan to release gas and also inject seawater into that reactor.
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Workers have been injecting seawater in a last-ditch effort to cool down fuel rods and prevent a full meltdown at two other reactors at the plant -- No. 1 and No. 3 -- after an 8.9-magnitude earthquake and ensuing tsunami Friday knocked out the reactors' cooling systems.
There are six reactors at Tokyo Electric Power Company's Fukushima Daiichi plant, located in northeastern Japan about 65 km (40 miles) south of Sendai.
A buildup of hydrogen in the Fukushima Daiichi plant's No. 3 reactor building caused the blast, authorities said, which injured 11 people and sent white smoke billowing above the nuclear plant.
But the explosion did not damage the reactor or result in significant radiation leakage, Edano told reporters.
The explosion blew away the roof and walls of the building housing the reactor, Japan's Kyodo News reported. A similar blast occurred Saturday at the plant's No. 1 reactor.
On Sunday, Edano warned that the same sort of explosion could occur in the No. 3 building.
After Monday's blast, authorities ordered at least 500 residents remaining within 20 kilometers (12 miles) of the plant to stay inside, Edano said. About 200,000 people evacuated the area over the weekend after a government order.
"There is no massive radioactive leakage," Edano said.
Even so, public concern over the possibility remained rampant Monday -- even outside the evacuation zone.
"Everyone is talking about it. There seems to be a real fear about this, an anxiety about it," said CNN's Dr. Sanjay Gupta, reporting from a school serving as an evacuation center about 100 kilometers (62 miles) away from the Fukushima Daiichi plant.
Low levels of radiation were detected at least as far as 100 miles northeast of the plant, according to the U.S. Navy, which repositioned ships and planes after detecting low-level "airborne radioactivity."
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The Navy's statement, however, provided some perspective, noting that the maximum potential radiation dose received by any ship personnel when it passed through the area was "less than the radiation exposure received from about one month of exposure to natural background radiation from sources such as rocks, soil, and the sun."
Japanese officials have said that they are operating under the presumption that there may be a partial meltdown in the No. 3 and No. 1 nuclear reactors at the Daiichi plant. Authorities have not yet been able to confirm a meltdown, because it is too hot inside the affected reactors to check.
The Tokyo Electric Power Company, which runs the plant, said in a news release late Sunday that radiation levels outside that plant remained high.
Kyodo, citing the same company, said that there were measurements of 751 microsieverts and 650 microsieverts of radiation early Monday. Both are above the legal limit, albeit less than one reading recorded Sunday.
A microsievert is an internationally recognized unit measuring radiation dosage, with people typically exposed during an entire year to a total of about 1,000 microsieverts.
Authorities early Sunday noted high radiation levels at another plant, located 135 kilometers (85 miles) away in Onagawa. The International Atomic Energy Agency later said that Japanese officials reported that levels had returned to "normal." It also said the increase detected earlier "may have been due to a release of radioactive material from the Fukushima Daiichi nuclear power plant."
Most experts aren't expecting a reprise of the 1986 Chernobyl meltdown, which killed 32 plant workers and firefighters in the former Soviet Union and at least 4,000 others from cancers tied to radioactive material released by the plant.
Analysts said Japan's crisis is unique.
"This is unprecedented," said Stephanie Cooke, the author of "In Mortal Hands: A Cautionary History of the Nuclear Age." "You've never had a situation with multiple reactors at risk."
Japan's 54 nuclear reactors provide about 30% of the country's electricity, according to the World Nuclear Association.
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Daiichi's No. 1 reactor -- the oldest of six boiling-water units at the site, according to the nuclear association -- began commercial operation in March 1971. The No. 2 reactor began commercial operation in 1974, and the No. 3 reactor followed two years later.
"Nuclear facilities in Japan ... were built to withstand earthquakes -- but not an 8.9 earthquake," said James Walsh, a CNN contributor and research associate at MIT's security studies program.
The crisis has stoked fears of a full-on nuclear meltdown, a catastrophic failure of the reactor core that has the potential for widespread release of radiation.
Officials are working to prevent such a calamity by injecting seawater and boron into the affected reactors -- even though salt and boron will corrode the reactors, rendering the Daiichi plant inoperable.
"Essentially, they are waving the white flag and saying, 'This plant is done,'" Walsh said. "This is a last-ditch mechanism to try to prevent overheating and to prevent a partial or full meltdown."
The situation -- part of what Prime Minister Naoto Kan called the "toughest and most difficult crisis for Japan" since the end of World War II -- has national and global repercussions as authorities and scientists debate the dangers of nuclear power.
Cooke said that it may take years to fully assess the damage at Japan's worst-hit reactors, much less to get them working again. And authorities may never definitively determine how much radiation was emitted, or how many got sick because of it.
If the effort to cool the nuclear fuel inside the reactor fails completely -- a scenario that experts who have spoken to CNN say is unlikely -- radiation could be released into the atmosphere or water. That could lead to widespread cancer and other health problems, experts say.
Authorities have downplayed such a scenario, insisting the situation appears under control and that radiation levels in the air are not dangerous.
The Daiichi plant has a containment vessel, which theoretically would capture radioactive material if a full meltdown occurs.
Edano has said there have been no leaks of radioactive material at any plants. Radioactive steam has been released intentionally to lessen growing pressure in the two Daiichi reactors -- in an amount authorities have described as minimal.
Monitoring of the Daiichi plant has detected several signs that at least a partial meltdown may be occurring, according to Japan's nuclear safety agency, including high levels of hydrogen inside reactor buildings and radioactive cesium detected outside the plant. This could be caused by the melting of fuel rods inside the reactor, experts said.
Despite such evidence, Noriyuki Shikata, a spokesman for Japan's prime minister, said Sunday that he would not describe what was occurring in the reactors as a "meltdown," adding that the situation was "under control."
But Cooke, also editor of Nuclear Intelligence Weekly for the atomic-energy community, said she's not convinced.
"The more they say they're in control, the more I sense things may be out of control," she said.

Cụ ạ. cụ. Đó là lò làm lạnh của nó. Vì mất hệ thống làm lạnh nên bây giờ đang cố dùng nước biển để làm mát lò phản ứng. hiện nay thêm một cái thứ hai vừa nổ. Em đang tìm xem đó là cái gì.

Sao thấy bảo tàu sân bay của mẽo cũng té rồi mà []

Đâu phải mỗi media của Việt, có cả các cụ hợp tác với Media để PR
Ngay cả 2 bài phát biều cách nhau có mấy ngày:
1. Tăng DTBB là điều không tưởng
2. Sẽ tăng DTBB nếu cần
Ngày trước bạn mình làm manager 1 Cty lớn, trước khi chuyển công tác cũng phát biểu kiếm ít rồi mới lượn. Nước trong thấy rõ

Đúng rồi hôm trước mình cũng đã gửi một đoạn đứa bạn msg cho mà
Nó chỉ nổ lớp bê tông ở ngoài do cho thoát khí ra khỏi lò bằng thép để giảm áp suất
trong khí thì có hydro nên gây nổ
đấy là điều bắt buộc phải làm nếu ko áp suất lên cao nổ cả lò thép thanh nhiên liệu lộ thiên thì thành bom nguyên tử mất
mọi thứ vẫn trong vòng kiểm soát
báo chí VN dịch vớ vẩn thành nổ nhà máy điện hạt nhân đáng nhẽ phải là có vụ nổ ở nhà máy điện hạt nhân thì đúng hơn

Bọn Nhật chấp nhận hi sinh một số nhà máy hat nhân nên cho bơm nước vào rồi.[]
Túm lại là các nhà máy này xem như ko hoạt động dc nữa! []
Còn chúng mà cố cứu đến cùng.. để lâu đến chảy lõi hạt nhân thì tường bao nhiêu lớp, sắt dày cỡ nào khi chảy lõi hạt nhân cũng toi tất! []
Đoán mò!

Mịa, không còn nguyên hoặc thừa sức chịu được thì nó làm lớp 2, lớp 3 làm gì?

Đọc lại đi.

Nếu như mà nổ nhà máy điện hạt nhân thì bây giờ chúng ta đã không thê ngồi đây viết comment được rồi.

Thật sự mấy thằng mà gọi là nhà báo tôi coi còn không bằng 1 đứa trẻ lên 3[r23)]

uh
3 lớp mới chỉ nổ lớp ngoài cùng thôi, chỉ có khoảng trên trăm người bị nhiễm phóng xạ thôi
vài lò phản ứng chỉ bị hỏng hệ thống làm lạnh thôi
bao giờ bị nổ banh mới đáng lo ngại []