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Showing posts with label Meltdown. Show all posts
Showing posts with label Meltdown. Show all posts
Corium-concrete interactions
"The fast erosion phase of the concrete basemat lasts for about an hour and progresses into about one meter depth, then slows to several centimeters per hour, and stops completely when the melt cools below the decomposition temperature of concrete (about 1100 °C). Complete melt-through can occur in several days even through several meters of concrete; the corium then penetrates several meters into the underlying soil, spreads around, cools and solidifies." Wikipedia
"Fukushima Dai-ichi
At an estimated eighty minutes after the March 11, 2011 tsunami strike (which caused various nuclear accidents, the worst of which being the Fukushima Daiichi nuclear disaster), the temperatures inside Unit 1 of the Fukushima Daiichi Nuclear Power Plant reached 2 300 ˚C to 2 500 ˚C, causing the fuel assembly structures, control rods and nuclear fuel to melt and form corium. The reactor core isolation cooling system (RCIC) was successfully activated for Unit 3, however the Unit 3 RCIC subsequently failed and at about 08:00 on March 13 the nuclear fuel had melted into corium. Unit 2 retained RCIC functions slightly longer and corium is not believed to have started to pool on the reactor floor until around 18:00 on March 14[49]" Wikipedia
Fukushima: Return to the disaster zone - Asia - World - The Independent
Fukushima: Return to the disaster zone - Asia - World - The Independent: "A year since the Fukushima nuclear plant was destroyed, the fight to prevent disaster goes on. In an exclusive dispatch from the reactors, David McNeill becomes the first European journalist to revisit Japan's ground zero"
Fukushima fuel rods may have completely melted | World news | guardian.co.uk
Fukushima fuel rods may have completely melted | World news | guardian.co.uk: "One of the plant's nuclear reactors was close to being breached as fuel rods bore through its concrete floor, says Tepco"
Plugging leaks will end crisis, not cold shutdown: analysts | The Japan Times Online
Plugging leaks will end crisis, not cold shutdown: analysts | The Japan Times Online: "Evacuees' health said at risk if they return home after 'Step 2' achieved"
Tepco revises plan for cooling reactors - The Washington Post
Reactor fuel at unit 1 has been fully exposed; corium has bored through the reactor vessel unleashed. There is concern that unit 2 and 3 may have melted as well. This 7 on the INES scale is way too low to describe this catastrophe.
Meltdown occured at Fukushima No. 1 reactor 16 hrs after March 11 quake
TEPCO finally confirmed the meltdown of reactor 1; and since it is leaking we can assume that the corium bore through and is working its way down the concrete slab below the reactor vessel. It will possibly reach the ocean and possibly ground water.
Some of the latest on Fukushima:
- Level 7 on INES scale.
- Strontium-90 was found on the ground of Fukushima;
- "Radiation released into the atmosphere peaked from March 15 to 16. Radiation is still being released, but the amount now has fallen considerably," said NISA's Nishiyama.
- Level 7 on INES scale.
- Strontium-90 was found on the ground of Fukushima;
- "Radiation released into the atmosphere peaked from March 15 to 16. Radiation is still being released, but the amount now has fallen considerably," said NISA's Nishiyama.
-" Lam Ching-wan, a chemical pathologist at the University of Hong Kong and member of the American Board of Toxicology, said this level of radiation was harmful.
"It means there is damage to soil, ecosystem, water, food and people. People receive this radiation. You can't escape it by just shutting the window," Lam said."
For the whole article see Reuters it has some new pictures which clearly show that Fukushima is not under control.
Contamination spread around hemisphere -Japan Times
"VIENNA (Kyodo) Radioactive materials released from the Fukushima No. 1 nuclear plant spread around the entire Northern Hemisphere in the two weeks following the March 11 disaster, an international nuclear watchdog said Thursday." See the whole article
TEPCO found water with 5 million times the legal limit of radioactivity
Because of the ocean contamination the Japanese government is considering imposing restrictions on seafood.
There is 60,000 tons of contaminated water which will likely end up in the ocean.
odine-131 in the water near the sluice gate of reactor No. 2 hit a high on April 2 of 7.5 million times the legal limit.
"After detailed discussions, it was concluded that since the radiation is spreading/expanding horizontally in other parts of Japan, it may result in further radioactive contamination in the supply chain of food exports from Japan," a statement from the Ministry of Health and Family Welfare said.
There is 60,000 tons of contaminated water which will likely end up in the ocean.
odine-131 in the water near the sluice gate of reactor No. 2 hit a high on April 2 of 7.5 million times the legal limit.
"After detailed discussions, it was concluded that since the radiation is spreading/expanding horizontally in other parts of Japan, it may result in further radioactive contamination in the supply chain of food exports from Japan," a statement from the Ministry of Health and Family Welfare said.
""We have borne the risks, co-existed and flourished with TEPCO for more than 40 years, and all these years, we have fully trusted the myth that nuclear plants are absolutely safe," said Katsuya Endo, the mayor of Tomioka town."
For the whole article see Reuters
Also, the IRSN is putting the Fukushima accident as a level 6 on the iINES scale.
IRSN updated trajectory of the nuclear plume
Mise à jour du 30 mars 2011
A partir des rejets estimés par l’IRSN, Météo France a modélisé la dispersion atmosphérique des rejets radioactifs à très grande distance. Cette modélisation vient d’être actualisée ; elle permet de projeter la dispersion dans l’air des rejets de l’accident de Fukushima à l’échelle mondiale, jusqu’au 1er avril.
Unit 2 core has been damaged and molten fuel is out of the reactor vessel -The Guardian reports
"On Tuesday, a US engineer who helped install reactors at the plant said he believed the radioactive core in unit 2 may have melted through the bottom of its containment vessel and on to a concrete floor."
Radioactive iodine-131 at 3,355 times the legal limit had been identified in the sea about 300 yards south of the plant.
See the whole article by Justin McCurry
This is a sad world!
Radioactive iodine-131 at 3,355 times the legal limit had been identified in the sea about 300 yards south of the plant.
Medical researcher Robert Peter Gale suggested to dump all radioactive material in non-gas form into the ocean, he said: "To some extent that's why some nuclear power plants are built along the coast, to be in an area where the wind is blowing out to sea, and because the safest way to deposit radiation is in the ocean.
"The dilutional factor could not be better – there's no better place. If you deposit it on earth or in places where people live there is no dilutional effect. From a safety point of view the ocean is the safest place."
See the whole article by Justin McCurry
This is a sad world!
Highly radioactive water leaked into the environment -Reuters
Water in Unit 2 and 3 is highly radioactive and TEPCO found some radioactive water into the piping tunnels at 1,000 millisieverts enough to cause hemorrhaging with a single dose.
Also, Greenpeace detected high radiation beyond the exclusion zone and called for expanding the evacuation zone another 12 miles.
Also, TEPCO has asked the French to help with the situation which is not close to being resolved.
Also, Greenpeace detected high radiation beyond the exclusion zone and called for expanding the evacuation zone another 12 miles.
Also, TEPCO has asked the French to help with the situation which is not close to being resolved.
"This is far beyond what one nation can handle -- it needs to be bumped up to the U.N. Security Council," said Najmedin Meshkati, of the University of Southern California. "In my humble opinion, this is more important than the Libya no-fly zone." Finally, someone with reason. For the whole article see Reuters.
The world community must handle this accident so that the reactors can be cooled and then entombed quickly because the radiation releases will affect the rest of the world like Chernobyl did and maybe even more so and thus it is time to pull all of our resources together and immediately.
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