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[Various] Japan Nuclear Emergency - Continuous Coverage of Damage and Radiation Risks - Page 274  

post #2731 of 2836
I always considered Japan the most advanced country in the world tek wise.
Still can t understand how the plant failed when they knew that a huge wave of water is coming.
They know that after an earthquake a tsunami comes so why was the plant still on ?!
Chernobil is something else ,they have vodka in the area.
   
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post #2732 of 2836
You cant just hit an off switch. A nuclear plant would probably take like 3-6 hours to fully shut down, not to mention the plant was damaged in the quake.
    
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post #2733 of 2836
Quote:
Originally Posted by The Architect View Post
You cant just hit an off switch. A nuclear plant would probably take like 3-6 hours to fully shut down, not to mention the plant was damaged in the quake.
We will never know if the plant failed due to the earthquake or because some people working there ignored the tsunami danger all together.Maybe it survived perfectly well to the earthquake ,it was build to take such.
   
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post #2734 of 2836
Quote:
Originally Posted by The Architect View Post
You cant just hit an off switch. A nuclear plant would probably take like 3-6 hours to fully shut down, not to mention the plant was damaged in the quake.
It actually takes days to cool off and shutdown, with coolant still being circulated by the pumps. Sure you can kill fission fairly quickly, but the reactor core still puts off lots of decay heat that needs sinked to prevent boil off of the coolant and the resulting core damage.


Quote:
Originally Posted by Dromihetes View Post
We will never know if the plant failed due to the earthquake or because some people working there ignored the tsunami danger all together.Maybe it survived perfectly well to the earthquake ,it was build to take such.
Huh? Sure we know. The tsunami cut the emergency diesel generators that are used to power the pumps when no other power source is available. With no power, the heat from the cores (whether shut down or not) boiled off the coolant and melted the fuel loads.
Edited by Skripka - 6/7/11 at 4:56pm
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post #2735 of 2836
Quote:
Originally Posted by Dromihetes View Post
Maybe it survived perfectly well to the earthquake ,it was build to take such.
Nope, it was built to withstand a 7.x, can't remember the precise number, though. Was it, perhaps, 7.8? The number seems familiar, but I'm not sure. Someone correct me on this, please. Anyway, the main quake was, as you know, 9.0. Furthermore, the scale isn't linear, so the actual difference is huge. A 7.0, for example, would be approximately equal to 480 kilotons of TNT explosive force. A 9.0, on the other hand, equals 480 MEGAtons.
Whoops. A difference of a thousandfold. Didn't expect that, huh?
Edited by Hyoketsu - 6/7/11 at 9:07pm
     
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post #2736 of 2836
Quote:
Originally Posted by Dromihetes View Post
I always considered Japan the most advanced country in the world tek wise.
Still can t understand how the plant failed when they knew that a huge wave of water is coming.
They know that after an earthquake a tsunami comes so why was the plant still on ?!
Chernobil is something else ,they have vodka in the area.
Sigh, the reactor automatically "shut down" when the earthquake was shut down. The problem that caused the crisis here was that the tsunami was higher than the wall they had in place for tsunamis. The tsunami then flooded the cooling systems, causing the reactors to overheat.
post #2737 of 2836
Quote:
Originally Posted by Semyon View Post
Sigh, the reactor automatically "shut down" when the earthquake was shut down. The problem that caused the crisis here was that the tsunami was higher than the wall they had in place for tsunamis. The tsunami then flooded the cooling systems, causing the reactors to overheat.
So you are saying that cooling is used even when the plant is off ?!
Sounds strange to me.
If the plant needed cooling (cooling system that brake due to flood ) it means that the plant was on.Or maybe i m wrong.
I always considered Japan to be the country where everything is perfectly set up.
   
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post #2738 of 2836
um when you shut a reactor down it doesnt' go off like a light switch, as stateed several times in this thread it will take days for it to"cool" down. Which is why the coolant needs to be constantly circulated.
also in some photos of the area I've seen it looks like some of the large coolant pipes are missing, probably washed out by the wave.
But I still don't understand why you would put emergency back up generators below sea level in an area prone to tsunami's. Doesn't really make sense
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post #2739 of 2836
Quote:
Originally Posted by black06g85 View Post
But I still don't understand why you would put emergency back up generators below sea level in an area prone to tsunami's. Doesn't really make sense
I agree ,this was like waiting for it to happen.
You may be right regarding the cooling process as well.

It happened and people should learn something from it.
Anyway you can t play with nature , neither control it , nature always wins.
   
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post #2740 of 2836
Quote:
Originally Posted by Dromihetes View Post
So you are saying that cooling is used even when the plant is off ?!
Sounds strange to me.
If the plant needed cooling (cooling system that brake due to flood ) it means that the plant was on.Or maybe i m wrong.
I always considered Japan to be the country where everything is perfectly set up.
The control rods that "stop" the reaction stop the neutrons released from each uranium atom from hitting other uranium atoms. However, the already-fissioned uranium atoms produce many other radioactive atoms which decay on their own and release enormous amounts of heat (5% of no-control rods IIRC) for days, weeks etc. These products must be cooled, or the unchecked heat will melt the entire assembly. Unfortunately, fuel rods were left completely exposed to air, without any cooling at all, and that is exactly what has happened in three reactors. This is a complete meltdown.
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