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Things Get Worse at Fukushima
An anonymous reader writes "Radiation levels are skyrocketing around Japan's Fukushima nuclear plant as reports indicate that a radioactive core has overheated and melted through its containment vessel and onto a concrete floor. Radiation levels inside reactor two were recently gauged at 1,000 millisieverts per hour — a level so high that workers could only remain in the area for 15 minutes under current exposure guidelines."
Just to be clear, they are absolutely not implying it has melted through the containment, but, rather, the reactor pressure vessel.
TEPCO has a history of coverups and other shenanigans that the cynical jaded type would come to expect from a large corporate-type organization. However, this is just coming back to bite them in the ass on the international stage, so I get the feeling they won't be so lucky this time.
This misinformation has been bandied about quite a bit, but the fact is that while Reactor 1 had reached the end of its operating license in March, the Japanese government had actually just extended the license for another 10 years in February. The "entire complex" was not by any means scheduled for shutdown, particularly units 5 and 6, which are undamaged and will likely be restarted at some point.
Concrete is a mixture that's water-based. Start with some dry concrete powder (or some Jell-O Instant Pudding), and your radioactive water becomes radioactive concrete. Then, put more concrete on the outside of that to put as much mass between fish and isotopes, and you're golden.
The part the grandparent post is making fun with is "if you have a material science background". One thing I do know about, is ceramic linings for metal melting furnaces as I've built some. I have in fact poured my own aluminum castings and machined them on my own lathe and milling machine. This necessitates considerable research and book reading about melting furnaces, etc.
First of all, heat plus solid concrete = powered concrete ready to add water. Red hot and concrete do not go together. Red heat breaks down cement. Cement plus heat equals dust. Concrete plus heat equals dust and gravel. Industrially at (relatively) low temperatures it takes hours to break limestone into cement, so at reactor temperatures it'll likely literally never "set up" into a solid. Plain ole cement aka burned lime quicklime whatever is limestone with the water of crystallization burned out of it. Then you add the water back in and it sets up into artificial limestone. Did you know the pyramids in Egypt are made of "limestone" or is it cured cement? There is a pretty interesting book on that topic. Plain ole cement is pretty cool technology. But it is beyond an epic fail at high temps.
Now you can buy ultra high temp ceramic coatings for furnaces, kilns, etc.
Problem 1) very low strength. Like puddle under their own weight. You're likely to end up with a white hot reactor surrounded by a glass puddle.
Problem 2) explodes and fractures on contact with water and thats everywhere down there in the reactor and on the coasts.
Problem 3) as generations of steel mills have learned even the best ceramic coatings turn back to dust after at most a year or two of use. So you've bought a year at best, now you have the same problem plus a megaton of mid level contaminated concrete. Ugh.
Problem 4) It would take an epic amount of high temp ceramic coating to cover the plant. Not in stock, the harbor is wrecked, its too heavy to airlift, and which country will volunteer to shut down their steelmills for a year until more can be made? This is the stuff where a little "salt bag" sized bag weighs about 100 pounds. And you need like a million of those bags. Hmm.
Problem 5) Cements in general are porous at a like ionic level. Right now, say, 1 percent of whats in the reactor has leaked out. Lets think about this logically, if 100% had leaked out into the sea, the plant would not be an issue anymore... Anyway, if you concrete it, that guarantees that 100% of the reactor core will end up in the ocean (eventually) and it 100% guarantees they will not be able to get at it to stop it (because its buried under concrete).
Problem 6) Learn what distillation and vapor pressure are. Right now, at least some isotopes are solid and can't fly away. Encapsulate it in a great insulator like cement, it'll get hot enough all right to make an even bigger more dangerous mess.
So in the short term it doesn't really do anything other than blow a lot of money and look very busy. Once the reactions cease and it cools, slapping some concrete on it might isolate it from the environment, for at most a couple decades, at most. Sooner or later you'll have to clean it up and the concrete will just get in the way.
"Science flies us to the moon. Religion flies us into buildings." - Victor Stenger
Construction on the Fukishima reactor began in 1967 (wikipage). It is easy to forget that Plate Tectonics was only accepted as a reasonable explanation of geological phenomenon in the 1960's. According to this excellent New York Times article,
"After an advisory group issued nonbinding recommendations in 2002, Tokyo Electric Power Company, the plant owner and Japan’s biggest utility, raised its maximum projected tsunami at Fukushima Daiichi to between 17.7 and 18.7 feet — considerably higher than the 13-foot-high bluff. Yet the company appeared to respond only by raising the level of an electric pump near the coast by 8 inches, presumably to protect it from high water, regulators said."
The tsunami that overwhelmed the plant recently was 46 feet high, far higher than anything they seemed to expect. If you read the NYTimes article, you get a sense that the nuclear safety bureaucracy hadn't adequately integrated modern plate tectonic theory into its safety programs. The 18 foot high maximum tsunami prediction is symptomatic of this.
From the article, it seems that Japan had based its tsunami predictions on historical records, instead of predictions from Plate Tectonic Theory. Computer simulations of plate movement would have given far larger predictions for maximum tsunami heights, predictions that would have agreed with the height of the recent tsunami. I think a strong argument can be made that Japan's nuclear bureaucracy had not taken into account modern Plate Tectonic Theory in its safety practices. They seem to have instead relied on past records of earthquakes and tsunamis. I am not suggesting that individual people were unaware of Plate Tectonic Theory, but instead that their bureaucratic rules didn't seem to acknowledge it. Since construction on the reactor began in 1967, planning of the reactor must have begun much earlier. It is easy to imagine that the initial reactor designers were unaware of the Theory of Plate Tectonics and its implications.
This and no other is the root from which a tyrant springs; when first he appears as a protector - Plato (423 to 327 BC)
If they were so unconcerned with saving them, why did they wait on the sea water? they could have done that days sooner but didn't because it would render the reactors useless.
Because then you end up with radioactive salts to deal with. Pure water will cool without transporting radiation, since theres nothing in pure water that will take on the extra particles. Salt also accelerates corrosion, and when the water boils away, it leave a nice crust all over everything, possibly clogging pipes/pumps/valves, as well as adding insulation to stuff thats already too hot.
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Sorry, I don't want to debunk every little sentence, however the whole block I quoted is completely wrong and nonsense.
If you would place a solar thermal power plant covering whole Nevada you could produce 100 times the energy the planet needs right now.
If you would use the coast of three random states in the USA, like Oregon, Florida and perhaps Texas to place there wind farms it would cover the energy needs of the USA 2 or 3 fold.
You simply don't know anything about energy production ... 99% of the people don't know anything about it, so it is not your fault.
But repeating the lies of the energy companies is no good.
Dude, you sound like a politician. Starting a sentence with "believe me" is utter fail.
Anyway, if you had studied the "numbers" as you claim, you would not write such bullshit.
Perhaps you have problems with where to put the decimal point, my apologizes if that is the case.
angel'o'sphere
Cost free eBook I read (by iBook/Kobo/Amazon/ObookO/Gutenberg etc.): "The Green Odyssey" by Philip Jose Farmer.