Fukushima Finally Reaches Cold Shutdown
mvdwege writes "The BBC reports that the reactors at Fukushima have reached cold shutdown, meaning they no longer need active cooling to stay at safe temperatures. Plans can now be made to start the cleanup of the site. Unfortunately, TEPCO has also admitted not all problems were out in the open until now; an estimated 45 cubic meters of contaminated water have leaked out of cracks in the foundation of a treatment plant."
The corium is all over the floor under the reactor pressure vessel in Unit 1. It's unknown how much it has melted through. This whole event proves that authorities cannot be trusted during a crisis.
Sky did not fall, Japan is not irradiated wasteland, Fallout is still just a game.
Finally the truth? What else are they keeping from us.
Or maybe more than just that.
Ever since the meltdown, the whole concept of a REACTOR has been bunk. There IS no reactor, and there hasn't been one since the fuel melted through. There is a lot of material undergoing fission, but it is NOT a reactor (or reactors) anymore. Journalism has been on on the downhill for as long as I can remember. Sigh.
I don't know... there was thing called an earthquake? Those have been known to make cracks in things.
In units of volume, that is 12,000 US Gallons, or 45,000 liters.
Also, about ¾ the volume of a typical 40' shipping container.
What a relief! I wonder when they'll start moving people back into Fukushima Prefecture. I can't wait to sink my teeth into some Fukushima vegetables and I know you feel the same way.
When do you suppose that 12 mile radius exclusion zone will be lifted? This decade or next?
Now that we've decided that the maximum radiation dosage for a Japanese child is the same as an American nuclear worker, it's only a matter of time before they play in the shadow of Fukushima again!
And let's not forget how much better Tokyo is with 30% less electricity.
...an abuse of the definition of shutdown. Reality check: - 3 melt-throughs - melted cores outside pressure chambers - compromised secondary containments - nuclear fuel and fission products escaping into water and air - corium so radioactive it cannot be approached even by robots - precarious leaning of number 4 spent fuel pool - widespread plutonium, caesium etc. beyond evacuation zone - significant contamination in food - yet to come: increased malignancies and birth defects Does this sound contained to you? Seriously...
I don't know... there was thing called an earthquake? Those have been known to make cracks in things.
And then a tsunami...
And then multiple hydrogen explosions...
No, yeah, parent was right. The cracks HAD to have been there and missed during inspections...
I imagine they would have inspected for cracks after the earthquake that caused them except for the fact that a giant fscking tsunami followed the earthquake and caused all of these problems. After that it was really not a matter of some cracks - it was "crap, keep this thing from becoming an even worse incident"
It's not possible the cracks were opened up by the, what was it, 9.0 magnitude earthquake, the 45 foot wall of water that came ashore shortly after that, and all of the 7+ magnitude aftershocks?
Um, earthquake?
Or at least the suspicion there may be seepage through cracks in the foundation. It was in the news quite a while ago, I guess they just released some numbers now and that's what the article was referring to? It's not the first "spill" either, one of the pools overflowed and some water was released into the ocean.
I don't know man.... was this quake of yours any serious?
Meanwhile, half a million people are homeless, about twenty thousand are dead. And all everybody cares to talk about is that some nuclear reactors weren't safe enough (through neglect of safety updates during the last three decades) to withstand a tsunami. If you criticize TEPCO for neglecting tsunami protection, why don't you criticize the whole Japanese government for neglecting tsunami protection along all of the coast?
Well, a very large earthquake, being steeped in contaminated water for almost a year, hydrogen explosions, large metal vessels being knocked over... there's a lot of ways those cracks could have formed during and after the incident.
The whole point of the design of that reactor was that it was designed to withstand an earthquake of that magnitude. If cracks formed during the earthquake, then the design was faulty from the start.
Occasionally living proof of the Ballmer peak.
Aren't they supposed to be inspected for this sort of thing on a regular basis? How the heck did they pass safety inspections with cracks that weren't properly sealed?
The same way they are passed in every country on the planet. Money.
Sure, the "reactors" have reached "cold shutdown."
How is this possible, you might ask?
Simple, because the fissile material is _outside_ of the "reactors."
'nuff said.
hope some people can finally take a breather, it's only been... 9 months...
http://mdn.mainichi.jp/mdnnews/news/20111216p2a00m0na002000c.html
No, I disagree. My take is that "withstand an earthquake" merely means that it would shutdown without drama, not that cracks wouldn't form. In fact, I think it wholly unrealistic to expect any sort of design of a large mass of concrete not to have cracks after a huge earthquake like that.
Don't forget the massive hydrogen explosions that blew the walls off the buildings. I'm sure that overpressure can't cause any significant cracking in concrete either.
Slashdot still doesnâ(TM)t support Unicode after it was added to the HTML standard in 1997.
The soil test pylon in berlin that Hitler made would take a 12.0 earthquake without a crack. It's still there and they have no idea how to get rid of it, it's slowly sinking into the ground and will not stop until it hits bedrock.
Do not look at laser with remaining good eye.
That explosion and resulting overpressure did damage the suppression pool at the base of one of the reactors. Reactor 2 if memory serves. This created a containment breach, if there wasn't one already due to melting of the fuel or breakage of coolant lines.
This is the problem with nuclear energy...everyone is so sure we can make it safe. Hubris is the problem.
The soil test pylon in berlin that Hitler made would take a 12.0 earthquake without a crack.
What? I've tried googling a variety of terms and have yet to find anything about this object. Also, how large is it? Is it comparable in size to a nuclear reactor?
They had to redefine "cold shutdown" to get there. Normally, cold shutdown of a reactor means temperature is below boiling and pressure is at 1 atmosphere. It's then possible to take the lid off the reactor and replace fuel rods.
Humans still can't enter the containment, and probably won't be able to do so for decades, if not centuries. So cleanup is going to have to be a robot job. Some kind of machinery is going to have to go in there and take the core apart, transferring each bit into a separate storage container.
Strangely, Japan seems to be behind the US in mobile robots for doing heavy work. They had to send to the US for iRobot units just to look around inside the containment, and for remote-controlled concrete pumping trucks to pour in water.
This is the problem with nuclear energy...everyone is so sure we can make it safe. Hubris is the problem.
I think it's ignorance myself. Suc as people who can't argue the point on its merits and appeal to a vague notion of "hubris" instead.
Designed for 8.0's, not 9.0's. The magnitude of the earthquake seems to be lost in history, already.
The structure seen above was placed to test the ability of the sandy Berlin soil to support the weight of the triumphal arch. It was a large concrete mass with apparatus to test and measure its movement relative to the ground level
I wasn't aware that destroying it was that out of reach.
Al.
Can you really take seriously anything these corporations, or GO's have to say on this matter?
In fact, I recently discovered the following dispersion model, which someone had linked to Berkeley’s discussion page. It uses TEPCO emission data to model possible dispersion patterns for Neptunium and Plutonium
http://www.datapoke.org/blog/89/study-modeling-fukushima-npp-p-239-and-np-239-atmospheric-dispersion/
http://datapoke.org/partmom/a=114
If this model is accurate, it is very disturbing. Why haven't we heard about plutonium dispersion from TEPCO or any other governmental organization?
The soil test pylon in berlin that Hitler made would take a 12.0 earthquake without a crack.
Or it might split in a 6.0 earthquake. Concrete cracking of massive structures is not usually caused by the shaking, but by the shifting of stress on the structure. Even a relatively small quake can apply stresses to this pylon which would split it. For example, if one side of the structure was pushed 5 cm one way and the other pushed 5cm the other, there will be cracking.
"Ra-di-a-tion. Yes, indeed. You hear the most outrageous lies about it. Half-baked goggle-box do-gooders telling everybody it's bad for you. Pernicious nonsense. Everybody could stand a hundred chest X-rays a year. They ought to have them, too. " -- J. Frank Parnell
I seem to recall reading that hte quake was twice as severe as the plant was designed to withstand.
Free Martian Whores!
I think he refers to the structure described there:
The structure seen above was placed to test the ability of the sandy Berlin soil to support the weight of the triumphal arch. It was a large concrete mass with apparatus to test and measure its movement relative to the ground level
I wasn't aware that destroying it was that out of reach.
Al.
"Because of nearby apartment buildings, it was not possible to demolish it with explosives at the end of World War II, so it remained; since 1995 it has been protected as a historic monument." http://berlin.unlike.net/locations/534-Schwerbelastungskoerper
Skeptics worry that the readings would be inaccurate if the melted fuel rods punctured their containment vessels and fell to the bottoms of the outer containment tanks. TEPCO has not been able to take direct measurements of the temperatures at the bottoms of the containment vessels, and the site is still too radioactive for the fuel rods' status to be visually confirmed.
("Skeptics cast doubt on Fukushima status, even as Japan declares nuclear reactors 'stable'", Arthur Bright, 16 DEC 2011, The Christian Science Monitor)
dragonhawk@iname.microsoft.com
I do not like Microsoft. Remove them from my email address.
BMOC: Containment has almost nothing to do with cold shutdown.
According to TEPCO, it does:
TEPCO: Definition of "Cold Shutdown Condition": ... Release of radioactive materials from PCV is under control and public radiation exposure by additional release is being significantly held down.
(Roadmap towards Restoration from the Accident at Fukushima Daiichi Nuclear Power Station, 17 Nov 2011, Nuclear Emergency Response Headquarters, Government-TEPCO Integrated Response Office)
TEPCO *is* changing the standard definition of "cold shutdown" somewhat. Now, they have *added* a containment requirement, so they're not really loosening any standards. Of course, normally "cold shutdown" doesn't include a containment requirement because normally the reactor vessel isn't breached.
zeigerpuppy has a point in that "cold shutdown" normally implies a state of normal control. Cold shutdown typically means the reactor is stopped, doesn't need active cooling, and can be safely opened for maintenance. Fuku is still an active disaster site.
I'm not advocating panic (what's the sense in that?), but fair criticism of TEPCO is, I think, well-deserved.
dragonhawk@iname.microsoft.com
I do not like Microsoft. Remove them from my email address.
Shutdown means that the temperature of the cores is in a safe state. However, they still need cooling through the emergency cooling system which was installed after the disaster. When the cooling system fails, it can become critical again. And as the cooling system is not stable enough to sustain earthquakes or another tsunami, they are far away from a safe. At least that is what the news tell us here.
--
make install -not war
A cold shutdown is a known and documented stable safe state, exactly defined in the specification of the reactor.
In the case of Fukushima 1 to 3, there is no shutdown whatsoever, because the state, shape and even the location of the cores are all unknown.
calling this a "shutdown" really is a joke. Not a funny one.
So the plant has cooled down a bit but the workers at that plant will be dying off for years to come. They were not paid to glow in the dark and die of cancer.
Considering the source, TEPCO, I'd hold off on the celebration. They've been caught lying several times so far. Hope it's true but lets get a report from a third party.
http://www.mapquest.com/?q=52.484,13.3716
That. and yes it's comparable in size. but a giant chunk of concrete that is still sinking to this day.
Do not look at laser with remaining good eye.
At a glance from Google Maps, the pylon is about 25 meters in diameter while a reactor is around 60 meters and with associated building (plumbing and pumping, I guess) is somewhere well over 100 meters (which at a wild guess is probably the dimensions of the underlying foundation). It also sounds like the pylon is more or less solid concrete while the reactors have substantial voids in them.
And as I noted in my other reply to your original post, it doesn't take that much of an earthquake to crack a reinforced concrete structure, if the earthquake applies that force to the building.
In the case of Fukushima's reactors, the whole area sunk about a meter. The crack probably occurred because part of the foundation sunk a little less than the other side or maybe they didn't uniformly sink at the same time.
Useless? You can't farm there, that is it. In 10 years, it will be below normal background radiation levels, if it isn't already.
Troll some more..
APK likes to ask for responses to the same things over and over. Maybe he just likes the responses?