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Uploaded by TheyDidThis on Mar 15, 2011
Another reactor at Japan's Fukushima Daiichi nuclear plant lost its cooling capabilities Monday, a government official said.
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.
The problem was detected in the plant's No. 2 reactor Monday afternoon, just hours after an explosion rocked the bulding containing the plant's No. 3 reactor, Chief Cabinet Secretary Yukio Edano told reporters.
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.
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, radiation was 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."
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.
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Inside Video Of Fukushima Nucler Power Reactor The Massive Walls Blast In Meltdown
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