Les dernières nouvelles de la méga-catastrophe nucléaire de Fukushima mises à jour quotidiennement (en anglais).
Fire seen at Fukushima nuclear plant; flames no longer visible
Reuters April 12 (Reuters)
April 09 2011
YouTube - TEPCO Fukushima Daiichi - Ocean Currents Are Carrying radioactive seawater to the North
April 7 12h06
|Japan Nuclear Meltdown: 'Fukushima Fifty' Worker Speaks Out|
April 6 2011 10:55 pm
The reading of iodine-131 was recorded Saturday, Tokyo Electric Power Co. said. Another sample taken Monday found the level to be 5 million times the legal limit. The Monday samples also were found to contain radioactive cesium at 1.1 million times the legal limit.
The exact source of the radiation was not immediately clear, though Tepco has said that highly contaminated water has been leaking from a pit near the No. 2 reactor. The utility initially believed that the leak was coming from a crack, but several attempts to seal the crack failed.
On Tuesday the company said the leak instead might be coming from a faulty joint where the pit meets a duct, allowing radioactive water to seep into a layer of gravel underneath. The utility said it would inject “liquid glass” into gravel in an effort to stop further leakage.
Meanwhile, Tepco continued releasing what it described as water contaminated with low levels of radiation into the sea to make room in on-site storage tanks for more highly contaminated water. In all, the company said it planned to release 11,500 tons of the water, but by Tuesday morning it had released less than 25% of that amount.
Although the government authorized the release of the 11,500 tons and has said that any radiation would be quickly diluted and dispersed in the ocean, fish with high readings of iodine are being found.
On Monday, officials detected more than 4,000 bequerels of iodine-131 per kilogram in a type of fish called a sand lance caught less than three miles offshore of the town of Kita-Ibaraki. The young fish also contained 447 bequerels of cesium-137, which is considered more problematic than iodine-131 because it has a much longer half-life. …. to continue reading click here! (The LA Times changed the headline to: "Japan nuclear plant operator reports some success on leak").
Internal NRC Documents Reveal Doubts about Safety Measures (Union of Concerned Scientists)
April 4 22h30
April 3 2011 21h05
|Near Fukushima, a Report From the Exclusion Zone|
April 2 2011 14h24
April 1st 10h00
Crews 'facing 100-year battle' at Fukushima - ABC News (Australian)
Fukushima Japan nuclear power plant updates: get all the data
March 30 11h00
Hamish McRae: The Fukushima effect, globally, will be colossal
Fukushima three hit by radiation burns
Cesium Fallout from Fukushima ALREADY Rivals Chernobyl |
Fukushima Nuke Plant Now in Full Meltdown
Fukushima radiation traces spread across Asia - ABC News
Radiation rises in seawater near Fukushima plant
Japan nuclear crisis: 'Fukushima 50' face new setback
Expert fears full nuclear meltdown at Fukushima |
Japan nuclear crisis: Radioactive particles detected in UK
Fukushima clean-up will take decades and cost billions - Channel 4
March 30 2011 10h 23
Caesium fallout from Fukushima rivals Chernobyl
Workers suffer hardships to stabilize Fukushima plant
Fukushima soil contains plutonium traces, according to Japanese officials
Radiation detected in Massachusetts rainwater as Fukushima crisis
March 28 22h00
March 27 18h25
Fukushima crisis: radiation fears grow for low-paid heroes ..
March 26 14h30
Videos from Maddow, The Realnews, Channel4, Msnbc, Russia Today and NHK
To be updated regularly - Dates correspond to american time.
March 25 22h37 update
Ominous smoke plumes, contaminated water and food, neutron beams -- but everything is just fine in Japan, suggest authorities
Dailymotion - Officials Announce Possibility of Fukushima Core ..
Fukushima No. 3 reactor core leaked: report
Transcript below the video
Since the japanese government announced earlier this week that elevated levels of radiation in tokyo tap water meant that infants should not consume that water, they have since rescinded that instruction. they are telling people now that the water is fine.
Two workers at the fukushima daiichi plant have now been hospitalized for radiation exposure after stepping into water that was radioactive while they were working to try to stabilize the plant.
The junior-level nuclear science we have all been doing to try to understand the news out of japan and its nuclear disaster now also has to extend to the never-before -- never-before-faced quandary of what to do with an uncontrolled nuclear reactor that is in essence packed with salt. they have been dumping in tons and tons and tons and tons of sea water into these hot reactors and these hot spent fuel pools. as the sea water boils off, it leaves behind salt. tons and tons of salt. how will that salt affect the still-continuing efforts to keep those reactors and those spent fuel rods from melting down? we are learning as we go on this. joining us now to help us understand what we can about this continuing crisis is dr. michio kaku. he's a theoretical physicist. he's also author of "physics of
Dr. Michio Kaki: mentioned the salt water quandary because of these fears that the salt from the sea water being used in desperation to cool down these reactors may eventually contribute to the risk factor at these reactors. can you help us understand in layman's terms what's really going on here?
Well, think of the little dutch boy facing all these cracks in a dike. this hole, that hole, that hole has to be taken care of. we now have another hole in the dike, and that is the creation of salt. 90,000 pounds' worth of salt in one unit because of the boiling of sea water. that salt encrusts the fuel rods like a cocoon, preventing cooling water from cooling the rod. when the rod hits 5,000 degrees, it starts to melt. hydrogen gas is released. and if there's a spark, you get a hydrogen gas explosion, which blows the whole spent fuel pond into the air. very similar to what happened at chernobyl.
>> in terms of that insulating factor of the salt, if they can switch over to fresh water for continued cooling efforts at these reactors, is it likely that that will i guess dilutex<ip r(t&h? hp &hc% that salt crust enough or dilute the impact of what they've been doing with the sea water enough to undo some of that insulating damage that's been done?
>> that's right. the hope is to use fresh water rather than sea water. but realize that they're making this up as they go along. take any nuclear engineering textbook, go to the last chapter for accident scenarios. this is not in the book. we're witnessing a science experiment with humans, us, as the guinea pig. they're literally making this up as they go along. we've never seen this before in a nuclear accident of this magnitude.
What do you make of the news that power, electrical power has been restored to the reactors? are you able to tell enough about how much damage has been done to the systems that you'd be hooking electrical power up to to know whether or not this is going to be a game changer in terms of wrapping this crisis up?
The problem is that they have electrical cables going into the units but they cannot turn on the pumps. in fact, they turned op the pumps at unit 2 and it didn't work. the problem is there's hydrogen gas and a spark by turning on the light switch could set off the hydrogen gas. so until they get the pumps going we have to rely on the firemen, and nowhere in the textbook do they say that firemen, the local firemen are the last resort to put out a nuclear accident. this is unprecedented. so we rely on the local firemen to put water on the site because the pumps are not yet turned on. it's very dicey. they're waiting to see whether or not they can turn on the pumps. and unit 2's pumps didn't work.
Inadvertently, tonight's show we've talked about the bp oil disaster. we've talked about the japan disaster. we keep talking about -- we actually talked about safety problems at diablo canyon. tonight's show has been all about making good policy and making adjustments in future planning to reflect past disasters. you are a futurist. you are a theoretical physicist. when you look at this situation in japan, clearly there has been a lack of imagination about how much can go wrong. how do you think we ought to start to plan a safer future based on what's happened at fukushima?
The key mistake they made was not to plan for the once in 100-year event. engineers say not in my lifetime, not in my children's lifetime. well, we have the once in 100-year event. look at katrina. that was not supposed to happen for 100 years. at fukushima the walls guarding against a tsunami were only about 15 feet tall. the tsunami tsunami that hit was 25 feet tall. and then they put the generators in the basement. that is the fundamental reason why this thing spun totally out of control. all the safety systems got wiped out simultaneously and that's not in the book. this is way outside the textbook that every nuclear engineer has to learn.
We need new textbooks that are way more scary than the existing textbooks in other words.
See previous breaking news on IN: