Earthquake in Japan....9.0...ouch!

It's probably being said and thought all over the world and any fool can take a one line quote out of context to try and make something out of it. Which is what is being done here.

Perhaps, but why would you broadcast/print/publish it? I imagine all the people out searching for family, trying to calm the NPP and searching for survivors in rubble are very grateful to hear that the American economy is doing well out of it...
 
Perhaps, but why would you broadcast/print/publish it? I imagine all the people out searching for family, trying to calm the NPP and searching for survivors in rubble are very grateful to hear that the American economy is doing well out of it...

Exactly, it's totally inappropriate. It should be a time of widespread concern and respect, not hand-rubbing and glee at the stable stockmarket.
 
Jesus, still listening, their readings suggest that most of the 4 metre long fuel rods were exposed for a while before they got the water pumped back in.
From reading the detailed link someone posted earlier it takes around 45 minutes of exposure (ie. no water cooling) for the core for it to hit a temperature where the inner containment would be damaged (at around 2200C) and it's not until around 3000C at which Uranium would start to be emitted. Even then you've got other containments around the core to stop the radiation leakage into the surrounding environment.

I would have thought that seen as fission had been halted on Friday as soon as the earthquake struck, most of the residual heat must have faded by now?

I know they were delaying the use of sea water as long as possible because it causes long-term damage due to corrosion, however, it's still been a day or so since that point.
 
Decay heat needs years of cooling management and the sea water causing corrosion really is of no concern. All the minerals in the water will be activated such that you have radioactive water to deal with.
 
I would have thought that seen as fission had been halted on Friday as soon as the earthquake struck, most of the residual heat must have faded by now?

Assuming the rods aren't already damaged, the decay heat will be around 0.3% of the initial heat output of a bit over 1000 MW by now, so maybe a few MW. Specific heat capacity of water is around 4 J/gK so assuming we've got 80 degrees K of water warming to play with, we'd need ~10 litres/sec. That is the kind of flow rate fire trucks should be able to deliver seawater.

If however, the rods are damaged, there could be more heat than several day old decay heat.
 
Really good article here, not sure if it has been posted yet

http://bravenewclimate.com/2011/03/13/fukushima-simple-explanation/

I almost stopped reading after:

There was and will *not* be any significant release of radioactivity.

Sure what hes saying is factually correct within the confines of the article but those reactors were hit by forces far greater than they were ever designed for - and they were designed with a huge amount of earthquake tolerance built in - and in some cases also recieved extensive tsunami damage... granted anyone with a decent understanding of whats going on there will say that the chances of any significant release of toxic material is slim but no one who really understood what was going on there would rule it out so absolutely.
 
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Assuming the rods aren't already damaged, the decay heat will be around 0.3% of the initial heat output of a bit over 1000 MW by now, so maybe a few MW. Specific heat capacity of water is around 4 J/gK so assuming we've got 80 degrees K of water warming to play with, we'd need ~10 litres/sec. That is the kind of flow rate fire trucks should be able to deliver seawater.

Try 4200J/kgK!
 
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I see that the panic buying has started:

1401 GMT: Concerns about possible radiation from the quake-damaged Fukushima nuclear power plant have apparently rippled out as far away as Finland -- the country's largest pharmacy chain says there was a run on iodine tablets at the weekend. "On Saturday there was a run on iodine, but the situation calmed down and we were able to replenish the stock on Sunday," Yliopiston Apteekki spokesman Jari Kokkonen told AFP. Finland's radiation and nuclear safety authority STUK said in a statement there was no chance the danger in Japan would lead to people in Finland needing to take iodine.

AFP
 
I almost stopped reading after:



Sure what hes saying is factually correct within the confines of the article but those reactors were hit by forces far greater than they were ever designed for - and they were designed with a huge amount of earthquake tolerance built in - and in some cases also recieved extensive tsunami damage... granted anyone with a decent understanding of whats going on there will say that the chances of any significant release of toxic material is slim but no one who really understood what was going on there would rule it out so absolutely.

That depends if he's talking from the point of view that 'things continue as they are' or 'things get completely out of hand'. I agree that it would be foolish to completely rule out the possibility but as of now things should surely be coming under control or at least be stable. IF there is a second earthquake then the **** could quite easily hit the fan.
 
Assuming the rods aren't already damaged, the decay heat will be around 0.3% of the initial heat output of a bit over 1000 MW by now, so maybe a few MW. Specific heat capacity of water is around 4 J/gK so assuming we've got 80 degrees K of water warming to play with, we'd need ~10 litres/sec. That is the kind of flow rate fire trucks should be able to deliver seawater.

If however, the rods are damaged, there could be more heat than several day old decay heat.

Why 1000mw and why 0.3%, decay heat is something close to 7% of total output of the plant, reactor 1 which was the first one in trouble is 460MW, the others are 784MW, as for water, you can't indefinately pump water in, because you can't just continually pump water into a limited space, theres no active cooling from the outside yet, which is something I assume that needs to be put in place to be able to comftably maintain the temperature inside the core.
 
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