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Sunday, March 13, 2011

News photo



Only the skeletal frame remains of the boxlike housing of the No. 1 reactor at Tokyo Electric Power Co.'s Fukushima No. 1 nuclear station after an explosion. KYODO PHOTO
Fukushima reactor cover blows up
Four hurt; radiation spews amid frantic effort to prevent meltdown
Compiled from Kyodo, AP

SENDAI — An explosion at a nuclear power station blew up the building housing a reactor Saturday, injuring four workers, as officials scrambled to prevent a meltdown.

The blast followed the failure of the power plant's cooling system, which was compromised by Friday's 8.8-magnitude temblor.

Tokyo Electric Power Co., the utility that runs the Fukushima No. 1 plant, said the four workers injured in the blast — two of its own staff and two from another company, do not have life-threatening injuries and all remained conscious.

At the time of the 3:36 p.m. blast, the four were tending to problems caused by the massive quake, which devastated northeastern Japan and generated giant tsunami.

The explosion about 250 km northeast of Tokyo destroyed the walls and roof of the aging facility, which housed the reactor, Chief Cabinet Secretary Yukio Edano told reporters at a hastily convened news conference Saturday evening.

TV footage showed that the power plant's roof and walls had disappeared. Tepco said the roof of the building collapsed after a large tremor.

Edano urged local residents to stay calm and said radiation levels were being carefully monitored. He also urged all residents living within 20 km of its Fukushima No. 1 and 10 km of No. 2. plants to evacuate.

"We are now trying to analyze what is behind the explosion," Edano said. "We ask everyone to take action to secure safety."

The nuclear power plant lost cooling ability after being jolted by Friday's devastating quake, and radioactive cesium and iodine were detected nearby Saturday.

Detection of the materials, which are created in the atomic fission process, prompted the nuclear safety agency to admit the reactor has been melting, a first for Japan.

According to the Fukushima Prefectural Government, hourly radiation emissions from the Fukushima plant reached 1,015 microsieverts on the premises — an amount equivalent to the dose an ordinary person would receive in one year.

The Nuclear and Industrial Safety Agency said serious damage to the stricken reactor's containment facility was unlikely despite the explosion.

Edano also said radiation levels have been decreasing and the reactor containment vessel wasn't damaged in the blast.

Wind in the region is weak and was headed in a northeastly direction — toward the sea — for the time being, the Meteorological Agency said.

The company scrambled earlier Saturday to release pressure in the containers housing the reactors to prevent a nuclear meltdown from occurring, the Nuclear and Industrial Safety Agency said.

Even before Tepco succeeded in reducing the pressure, which involved releasing steam that would likely include radioactive materials, radiation had risen to an unusually high level in and near the No. 1 nuclear plant.

Work to depressurize the containers, aimed at preventing the plants from sustaining damage and losing their critical containment function, was conducted under an unprecedented government order.

At the No. 1 plant, the amount of radiation reached around 1,000 times normal inside the control room of the reactor, and 70 times normal near its main gate.

It was the first time an external radioactive leak had been confirmed since the disaster.

Earlier reports said the U.S. Air Force was helping to deliver coolant to the damaged plant, which Secretary of State Hillary Clinton was believed to have confirmed Friday in the U.S.
 

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They had Six.......reactors total, they that were overheating and were potential melt down incidents.

Pretty likely that one of the two worst ones actually melted thru the containment vessel and into the concrete.

When the are dumping Boron into them, ya know they were at last ditch efforts.




"Tokyo Electric Power Co., which operates the plant, said radiation levels at Unit 3 were well under the levels where a nuclear operator must file a report to the government."




"Everything is under....... (boooom) under....(booooom) control."

:laughing:
 

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Poorly written and misleading article.\


Official reports as of 11:25 on 03/14 are that these are false statements. There has been controlled releases (which contain radioactive material) to reduce pressure.

Fukushima reactor cover blows up
Four hurt; radiation spews
This is what has been reported

The Nuclear and Industrial Safety Agency said serious damage to the stricken reactor's containment facility was unlikely despite the explosion.

Edano also said radiation levels have been decreasing and the reactor containment vessel wasn't damaged in the blast.
and is inconsistent with (other parts of this article):

An explosion at a nuclear power station blew up the building housing a reactor Saturday, injuring four workers, as officials scrambled to prevent a meltdown.

… destroyed the walls and roof of the aging facility, which housed the reactor.

Cesium comes from a breach in the fuel cladding. Without knowing the radioisotopics in the reactor coolant system prior and following an event one cannot determine that any fuel melting has occurred. Nuclear plants often operate with one or more damaged fuel pins.

These reactors are "boiling water reactors" designed in the US by B&W in the 1960's when this country new how to build things robust.

If the core is kept cool, which is very likely now, this will have very little to no long term impact on the enviornment. Not even close to Chernobyl's impact on the enviornment.
 

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Up to now, nobody has been killed due to these power plants, but yet the left wingers here in the US will try to stop ANY future plant here just watch :lookinup:
 

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If the core is kept cool, which is very likely now, this will have very little to no long term impact on the enviornment. Not even close to Chernobyl's impact on the enviornment.
Yes, this will not be similar to Chernobyl at all since the actuall reactor components have not exploded and burned sending radioactive ash into the air.
 

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Up to now, nobody has been killed due to these power plants, but yet the left wingers here in the US will try to stop ANY future plant here just watch :lookinup:
No way.

We need to build more right now, and that's what we are doing.
 

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"Late Monday, the chief government spokesman said there were signs that the fuel rods were melting in all three reactors, all of which had lost their cooling systems in the wake of Friday's massive earthquake and tsunami

"Although we cannot directly check it, it's highly likely happening," Chief Cabinet Secretary Yukio Edano told reporters".

http://news.yahoo.com/s/ap/as_japan...zZWMDeW5fdG9wX3N0b3J5BHNsawNqYXBhbnV0aWxpdHk-
 

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These reactors are "boiling water reactors" designed in the US by B&W in the 1960's when this country new how to build things robust.
yep.


40-50 year old reactors, safe, fully functioning and producing reliable energy before the quake.:thumbsup:
 

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"Late Monday, the chief government spokesman said there were signs that the fuel rods were melting in all three reactors, all of which had lost their cooling systems in the wake of Friday's massive earthquake and tsunami

"Although we cannot directly check it, it's highly likely happening," Chief Cabinet Secretary Yukio Edano told reporters".

http://news.yahoo.com/s/ap/as_japan...zZWMDeW5fdG9wX3N0b3J5BHNsawNqYXBhbnV0aWxpdHk-


Interesting read.


"...And, some analysts noted, the length of time since the nuclear crisis began indicates that the chemical reactions inside the reactor were not moving quickly toward a complete meltdown. "


I am not sure which "chemical reactons" are a concern. Maybe Hydrogen and Oxygen?

The Japanees do not appear to have a consistent story.

I agree with you, in that I see a whole bunch of new studies/regulations comming for the US nuclear industry.
 

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yep.


40-50 year old reactors, safe, fully functioning and producing reliable energy before the quake.:thumbsup:

The advance light water reactor designs are definatly safer. If you want to go see one you will need to go to China as they are the only ones building them.

The AP-1000, designed by Westinghouse over the last 20 years has been sold (only) to China. They bought all the designs, drawings and rights to build more.
 

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I agree with you, in that I see a whole bunch of new studies/regulations comming for the US nuclear industry.

This tragic, catastrophic event will change many things for the better in the world, I expect.

From new studies, regulations in the nuclear industry globaly, to new design additions, application changes, ect..

Better, stronger relations with Japan...

And possibly stronger future relations with other asian countries.

Hopefully our nations outlook on the future safety of our west coast will also be modified.

The Pacific Ring of Fire is nothing to be taken lightly.
 

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This will be used to block attempts. The increased regulations will make building a new reactor cost prohibitive. I wonder how many solar panels and wind turbines were smashed and shattered during the quake and flood ? Maybe we should increase the regulations and design specifics of these also. I wonder how many of those mercury filled time-bombs were broke in this catastrophe... and what impact they will have on virtually every aspect of rebuilding ? Seems some new regulations and designs are due there also.
 

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This will be used to block attempts. The increased regulations will make building a new reactor cost prohibitive. .
whaaa?



Reactor costs are already cost prohibitive.


Nobody wants to spend money to drive down their own profits.....duh.....
 

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This will be used to block attempts. The increased regulations will make building a new reactor cost prohibitive. I wonder how many solar panels and wind turbines were smashed and shattered during the quake and flood ? Maybe we should increase the regulations and design specifics of these also. I wonder how many of those mercury filled time-bombs were broke in this catastrophe... and what impact they will have on virtually every aspect of rebuilding ? Seems some new regulations and designs are due there also.

I find it difficult to believe that a Tsunami was not considered in the design of this nuclear complex. With multiple reactors at risk it seems that the design of these plants does not address the conditions under which they may be required to survive.


As for cost, I do not see how this could have been that expensive to design systems to address it. In this case deep wells, emergency diesel generators with flood protection, piping, valves and some procedures would not have been that expensive.

WANO (world association nuclear operators) as well as INPO and EPRI (google the names if you care). Will publish lessons learned, weaknesses identified and (more interesting) a detailed discussion of equipment effected and plant response. I am a big advocate of "defense in depth" and have no doubt there will be changes for the better.
 
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