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[Various] Japan Nuclear Emergency - Continuous Coverage of Damage and Radiation Risks - Page 78  

post #771 of 2836
Quote:
Originally Posted by roberts91 View Post
This is going to be a really stupid question because since it obviously hasn't been asked everyone else seems to get it. If the nuclear power plants were shutdown at the time of the earthquake why are the nuclear power plants still producing heat?

At least that's what it sounds like to me or does it just take a really long time to cool down these power plant reactors to a safe level?
To my knowledge only the cooling pumps failed.
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post #772 of 2836
Not to mention they only had a 15 minute notice before the quake hit.
post #773 of 2836
Thread Starter 
Quote:
Originally Posted by roberts91 View Post
This is going to be a really stupid question because since it obviously hasn't been asked everyone else seems to get it. If the nuclear power plants were shutdown at the time of the earthquake why are the nuclear power plants still producing heat?

At least that's what it sounds like to me or does it just take a really long time to cool down these power plant reactors to a safe level?
Light water reactors experience decay heat after they shutdown. Basically the reactor continues to make heat as reactions are still occurring. Typically after shutdown a LWR will continue to produce energy equivalent to 7% of the power level it was operating at prior to shutdown. After shutdown it can cool to 1-2% within a couple days, but can take several weeks to months to reach low temperatures. Hence why cooling is important even in reactors that are shutdown.
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post #774 of 2836
Thread Starter 
Weather Update - Winds in the area of the Fukushima nuclear plants were set to turn westerly on Sunday night, Japan's meteorological agency said according to Reuters. "The wind direction is right for people in Japan," it quotes Lennart Carlsson, director of the Nuclear Power Plant Safety in Sweden, as saying. "It's blowing out to the Pacific. I don't think this will be any problem to other countries.
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post #775 of 2836
I'd like to point out that this is essentially the worst case scenario. We have a 40 year old reactor that was about to be retired, next month, that gets hit by a 9.0 magnitude earthquake and causes an explosion. Oh, and all this happens in a heavily populated island. The fact that there hasn't be a catastrophic meltdown tells you that the system was designed quite well to survive such a scenario.
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post #776 of 2836
and china?

west wind..
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post #777 of 2836
Thread Starter 
OP Updated - Japanese authorities have told the UN nuclear watchdog, the IAEA, that radioactivity levels "at the site boundary" of the Onagawa nuclear power plant have returned to normal, Reuters reports. A state of emergency was declared at the site on Sunday after radioactivity readings exceeding allowed levels in the area.
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post #778 of 2836
Quote:
Originally Posted by ENTERPRISE View Post
I think that they ought to look into new energy production methods, Nuclear in the long run is not safe, whichever way you look at it. It may be Cleaner until you have to dispose of the waste but its not safe. Even a natural disaster proves that.
I'm sorry but NO, just NO. Nuclear energy is one of the safest forms of power we have now. We have had three issues since we started using it, two were from poor design and human error and this one which took one of the largest earthquakes ever recorded and several tsunamis hitting it to even get it to the point where there is as of now a slim chance of anything other then local issues. Nuclear puts out far more power than anything we have now, is much cleaner than any of the other major sources of energy. Solar, wind, hydro and geothermal excluded as they aren't major players in the grand scheme of things, the list goes on and on. This disaster does not show how unsafe nuclear energy is, it shows how unsafe insane natural disasters are.

Nuclear waste is an overblown issue that really isn't a big deal, you do know that coal ash that is put out in coal plants is radioactive right? And that goes right into the air whereas with nuclear waste we can bury it with really no issues. There is already radioactive material everywhere anyway. Plus with the prospect of reusing spent nuclear fuel to further fuel plants only puts a positive light on nuclear energy. If nuclear energy were truly dangerous I would think there would have been an issue by now in a modern plant that wasn't the result of insane circumstances. PLUS these reactors that are having issues are 40 years old, there are far stricter safety precautions now and if you look at the news even after all this punishment that has been directed at these reactors they STILL haven't been NEAR as bad as the two prior meltdowns that were a direct result of human error and poor design.(which doesn't happen anymore in modern plants)


Quote:
Originally Posted by gdansk View Post
I'd like to point out that this is essentially the worst case scenario. We have a 40 year old reactor that was about to be retired, next month, that gets hit by a 9.0 magnitude earthquake and causes an explosion. Oh, and all this happens in a heavily populated island. The fact that there hasn't be a catastrophic meltdown tells you that the system was designed quite well to survive such a scenario.
Thank you, someone who gets it.
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post #779 of 2836
Thread Starter 
Good article on Coal Ash:

http://www.scientificamerican.com/ar...ste&print=true

Quote:
The popular conception of nuclear power is straight out of The Simpsons: Springfield abounds with signs of radioactivity, from the strange glow surrounding Mr. Burn's nuclear power plant workers to Homer's low sperm count. Then there's the local superhero, Radioactive Man, who fires beams of "nuclear heat" from his eyes. Nuclear power, many people think, is inseparable from a volatile, invariably lime-green, mutant-making radioactivity.

Coal, meanwhile, is believed responsible for a host of more quotidian problems, such as mining accidents, acid rain and greenhouse gas emissions. But it isn't supposed to spawn three-eyed fish like Blinky.

Over the past few decades, however, a series of studies has called these stereotypes into question. Among the surprising conclusions: the waste produced by coal plants is actually more radioactive than that generated by their nuclear counterparts. In fact, the fly ash emitted by a power plant—a by-product from burning coal for electricity—carries into the surrounding environment 100 times more radiation than a nuclear power plant producing the same amount of energy.

Edited by Lampen - 3/13/11 at 3:05pm
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post #780 of 2836
Damn, hopefully it'll get under complete control soon. Never really thought about an earthquake hitting a nuclear power plant.

Quote:
Originally Posted by ABeta View Post
The island of Japan just needs to be ditched by it's people ASAP. Relocate to Russia or some other country with large unused land.
They've got a nice island called ostrov Novaya Zemlya. Oh wait...
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