Earthquake and Tsunami hits Japan.


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Message 1086522 - Posted: 12 Mar 2011, 20:32:57 UTC - in response to Message 1086519.



Very common in Japanese restraunts.
Typical recipes include tofu, flaked bonito, green onion

Tasty. A bit heavy in MSG but I doubt that is a major concern right now.

It sounds like a dish best served HOT... ;)
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Message 1086524 - Posted: 12 Mar 2011, 20:41:10 UTC - in response to Message 1086522.

It s times like this when it is easy to see why people like to post in here.
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Message 1086538 - Posted: 12 Mar 2011, 21:40:24 UTC

Here's an updated report on the Japan Quake:

Rescuers scramble to save lives as aftershocks jolt Japan
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Message 1086626 - Posted: 13 Mar 2011, 2:06:40 UTC

Looks like all three reactors are in danger and one has already suffered a partial melt down. At this point it's almost tied with 3 mile islands and I expect it will be approaching Chernobyl pretty soon.

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Message 1086634 - Posted: 13 Mar 2011, 2:33:42 UTC - in response to Message 1086626.
Last modified: 13 Mar 2011, 2:49:41 UTC

Looks like all three reactors are in danger and one has already suffered a partial melt down. At this point it's almost tied with 3 mile islands and I expect it will be approaching Chernobyl pretty soon.

The News said the core was intact, As the explosion didn't expose vessel where the rods are at and that their pumping sea water in there to help cool the vessel and that seems to be working. It was an old bunch of reactors that were scheduled in 2 weeks to be taken offline permanently as their just too old to run. In any case It was just an outer building and that might have been just steam. And radioactivity levels since the explosion have been going down.

Oh and No one beyond Russia used Chernobyl type reactors as their just too dangerous and are obsolete now as they use graphite as moderators as the wiki here says. Also flammable Bitumen was used at Chernobyl as part of the roof and there was no containment building as the higher ups in the party felt It wasn't needed as Soviet designs were Superior as far as they were concerned.
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Message 1086635 - Posted: 13 Mar 2011, 2:37:39 UTC

The day the Chernobyl cloud passed over Italy I was visiting the Euratom site ad Ispra and, as a rule, I was given a small nuclear radiation detector to monitor any radiation I might receive. I had to give it back while exiting the site, so I never knew how much radiation I had absorbed that day.
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Message 1086636 - Posted: 13 Mar 2011, 2:59:21 UTC - in response to Message 1086635.
Last modified: 13 Mar 2011, 3:07:48 UTC

The day the Chernobyl cloud passed over Italy I was visiting the Euratom site ad Ispra and, as a rule, I was given a small nuclear radiation detector to monitor any radiation I might receive. I had to give it back while exiting the site, so I never knew how much radiation I had absorbed that day.
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Of course there is a difference between Chernobyl and Fukushima I, Chernobyl was man made as Disasters go, And Fukushima I is a real accident that may not have been adequately protected from a Tsunami by a 35' tall sea wall. But We'll see as some of the reactors there were built back in 1967 and are probably obsolete now. This doesn't mean all there are due to be shut down, Just the older ones.
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Message 1086643 - Posted: 13 Mar 2011, 3:28:11 UTC - in response to Message 1086636.

The day the Chernobyl cloud passed over Italy I was visiting the Euratom site ad Ispra and, as a rule, I was given a small nuclear radiation detector to monitor any radiation I might receive. I had to give it back while exiting the site, so I never knew how much radiation I had absorbed that day.
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Of course there is a difference between Chernobyl and Fukushima I, Chernobyl was man made as Disasters go, And Fukushima I is a real accident that may not have been adequately protected from a Tsunami by a 35' tall sea wall. But We'll see as some of the reactors there were built back in 1967 and are probably obsolete now. This doesn't mean all there are due to be shut down, Just the older ones.

There are other major differences. Chernobyl was a graphite moderated reactor. These have two distinct problems that do not exist in other types of reactors. First Graphite tends to catch fire. Second, they do not do well at all at low power.

There were several other problems with Chernobyl. Including the roofs of the non-containment buildings. These were made of sheet metal with crimped edges with a coating of tar on top. These are bad fire hazards because the tar on the roof is metered into any fire inside the building at a rate that usually keeps it burning hot - no matter what the firemen do. The containment building failed to keep the radiation inside, and released a major cloud of radioactive ash into the atmosphere. My bet is that the containment buildings in Japan will hold, and it will be more like Three Mile Island.
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Message 1086647 - Posted: 13 Mar 2011, 3:42:17 UTC

I think the containment building of one reactor has exploded, unless it was the turbine hall that exploded cause a hydrogen buildup.
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Message 1086649 - Posted: 13 Mar 2011, 3:45:43 UTC - in response to Message 1086647.

I think the containment building of one reactor has exploded, unless it was the turbine hall that exploded cause a hydrogen buildup.
Tullio

From what the News said It was not the Containment/Vessel that exploded Tullio. The explosion looked more like hydrogen/steam than anything else and the radioactivity did fall the News said, which is good.
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Message 1086652 - Posted: 13 Mar 2011, 4:03:09 UTC

The safety of a nuclear reactor is three tiered. Th first tier is the casing of the fuel elements, made from an alloy called Zircaloy. The second is the steel vessel containing the reactor core. The third one is the containment building made of reinforced concrete. It is this that may have crumbled after a chemical explosion.
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Message 1086704 - Posted: 13 Mar 2011, 12:05:57 UTC

Some of the most amazing pictures I've seen yet are from the UK Mail on Sunday, although I think that their map at the end is a bit out of date now.

Japan quake
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Message 1086729 - Posted: 13 Mar 2011, 14:03:34 UTC
Last modified: 13 Mar 2011, 14:13:05 UTC

A state of emergency has been declared at a second nuclear power plant in Japan, the International Atomic Energy Agency has said. "Japanese authorities have informed the IAEA that the first, or lowest, state of emergency at the Onagawa nuclear power plant has been reported by Tohoku Electric Power Company," a statement said, according to the AFP news agency. The alert was declared "as a consequence of radioactivity readings exceeding allowed levels in the area surrounding the plant". "Japanese authorities are investigating the source of radiation," it added.


Authorities have also said there is more than 70 percent chance of a magnitude 7 earthquake happening in the next three days.

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Message 1086762 - Posted: 13 Mar 2011, 16:31:47 UTC
Last modified: 13 Mar 2011, 16:34:01 UTC

Q&A: What has quake done to Japanese nuclear reactors?


How does a nuclear reactor of this kind work?

Uranium 235 -- the fuel inside a nuclear reactor -- undergoes nuclear fission. This process emits a lot of heat energy, (water is used to cool down the U235)which produces steam, and that steam turns a turbine, generating electricity.

What happened to the nuclear reactors during the quake?

Three of the six reactors at the site were in operation when the earthquake hit. The reactors are designed to shut down automatically when a quake strikes, and emergency diesel generators began the task of pumping water around the reactors to cool them down. However, these stopped about an hour later. The failure of the back-up generators has been blamed on tsunami flooding by the International Atomic Energy Agency (IAEA).

On Sunday an official with Japan's Nuclear and Industrial Safety Agency said a meltdown may be under way at one of Fukushima Daiichi's nuclear power reactors.

Described by one analyst as a "Hail Mary pass", Tokyo Electric Power Company began injecting sea water mixed with boron into the primary containment vessel in an operation that got under way Saturday night, IAEA said.

Boron is an element with the ability to absorb neutrons, the sub-atomic particles that occur in the nucleus of all atoms. In a nuclear reactor, it is essential that just the right number of neutrons are present. Too many neutrons can cause a fission reaction to get out of control. Too few neutrons and a fission reaction stops.

What could have caused the explosion at the plant?

The blast was not caused by damage to the nuclear reactor but by a pumping system that failed as crews tried to bring the reactor's temperature down, Chief Cabinet Secretary Yukio Edano said Saturday. He said the plant operator confirmed there was no damage to the steel container housing the reactor.

Malcolm Grimston, Associate Fellow for Energy, Environment and Development at London's Chatham House, said he believed the explosion had been caused by a build-up of pressure inside the inner containment of the reactor.

"Because they lost power to the water cooling system, they needed to vent the pressure that's building up inside.

"My suspicion is that as the temperature inside the reactor was rising, some of the metal cans that surround the fuel may have burst and at high temperature, that fuel cladding can react with water to produce zirconium oxide and hydrogen.

"That hydrogen then will be part of the gases that need to be vented. That hydrogen then mixes with the surrounding air. Hydrogen and oxygen can then recombine explosively.

"So it seems while the explosion wasn't directly connected with the nuclear processes, it was indirectly connected, because the hydrogen was only present because of what was going on in the reactor core."

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Message 1086787 - Posted: 13 Mar 2011, 17:23:49 UTC

UK latest
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Message 1086791 - Posted: 13 Mar 2011, 17:32:11 UTC - in response to Message 1086787.
Last modified: 13 Mar 2011, 17:32:48 UTC

UK latest

Yeah, But I think 10,000 may be somewhat low, I expect the death toll to be much higher, But by then the News will have moved on, As the Quake by then will be old news not worth reporting.
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Message 1086795 - Posted: 13 Mar 2011, 17:43:10 UTC - in response to Message 1086791.

UK latest

Yeah, But I think 10,000 may be somewhat low, I expect the death toll to be much higher, But by then the News will have moved on, As the Quake by then will be old news not worth reporting.


We┬┤ll be informed in eueope.
With no doubt.

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Message 1086801 - Posted: 13 Mar 2011, 17:49:47 UTC

How on earth are they going to remove the many ships inland on the ground? Some are very large, they will have to be cut up in pieces one assumes?

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Message 1086803 - Posted: 13 Mar 2011, 17:53:50 UTC - in response to Message 1086801.

How on earth are they going to remove the many ships inland on the ground? Some are very large, they will have to be cut up in pieces one assumes?

It can be done, One was up on a dock, There a coffer dam could be constructed so as to float the ship away and then lower the ship back down, But cranes would be cheaper to use, For those farther away Cranes and special moving equipment would be needed, As It's like moving a large building, So cutting/scrapping is not needed.
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