I korta drag kan man sammanfatta det med tre punkter:
1. Ryssarna löste det genom att dränka ruinerna i enorma lager av betong och ge upp stora mängder land för all framtid. Japanerna har bara stabiliserat ruinerna med kylvatten.
2. Japanerna har 1300 st 600 kg bränslestavar i bassänger som ligger mitt i svåråtkomliga ruiner.
3. Det är ett massivt missförstånd att tro att någonting "har stängts av". Vad det handlar om är mer att man tycks ha stannat upp efter att ha stabiliserat läget med bassängerna.
Vad som beskrivs i artikeln är två lägen för framtiden:
1. Fortsätta som nu och det är bara en tidsfråga innan katastrof pga skadorna på anläggningen om de enorma mängder bränslestavar som kyls inne i ruinerna. Katastrofen kan delas upp i en mer dramatisk risk och en mer långsam risk i form av dricksvattenreserver.
2. Då alternativ ett inte är så attraktivt så kommer alternativ två in. Att lyfta ut 1300 st 0.6 tons pjäser ur ruiner där personalen samtidigt måste ha omfattande skyddsutrustning och ändå bytas ut tätt. Artikeln menar på att en enda tappad pjäs kan innebära närmast ofattbar katastrof. 3 dagar efter artikeln uttrycker Kina "chock" över läget och samtidigt höjer Japan varningsnivån från 1 till 3 på den 7 gradiga skalan. Nivån 4 - 7 är klassade olyckor, under "incidenter"
Artikeln från RT väldigt läsvärd om än mycket skrämmande.Ett utdrag:
RT: Given all the complications that could arise with extracting the fuel rods, which are the most serious, in your opinion?
CC: The most serious complication would be anything that leads to a nuclear chain reaction. And as outlined above, there are many different ways this could occur. In a fuel pool containing damaged rods and racks, it could potentially start up on its own at anytime. TEPCO has been incredibly lucky that this hasn't happened so far.
'One of the worst, but most important jobs anyone has ever had to do'My second biggest concern would be the physical and mental fitness of the workers that will be in such close proximity to exposed fuel during this extraction process. They will be the ones guiding this operation, and will need to be in the highest state of alertness to have any chance at all of executing this plan manually and successfully.
Many of their senses, most importantly eyesight, will be hindered by the apparatus that will need to be worn during their exposure, to prevent immediate death from lifting compromised fuel rods out of the pool and placing them in casks, or in the common spent fuel pool located a short distance away.
Think for a moment what that might be like through the eyes of one of these workers; it will be hot, uncomfortable, your senses shielded, and you would be filled with anxiety. You are standing on a building that is close to collapse.
Even with the strongest protection possible, workers will have to be removed and replaced often. So you don't have the benefit of doing such a critical task and knowing and trusting your comrades, as they will frequently have to be replaced when their radiation dose limits are reached.
Två andra länkar kommer liksom den ovan från Ed Steers blogg som jag ju har rullande på vänstra bloggrullen.
Artikel 2 Reuters:
China said it was "shocked" to hear contaminated water was still leaking from the plant, and urged Japan to provide information "in a timely, thorough and accurate way".
"We hope the Japanese side can earnestly take effective steps to put an end to the negative impact of the after-effects of the Fukushima nuclear accident," China's Foreign Ministry said in a statement faxed to Reuters in Beijing.
Japan's Chief Cabinet Secretary Yoshihide Suga called the situation "deplorable", and the Nuclear Regulation Authority (NRA) said it feared the disaster - the worst nuclear accident since Chernobyl a quarter of a century earlier - was "in some respects" beyond the plant operator's ability to cope.
Artikel 3 BBC
Mer citat från RT:
Here’s what needs to be done: more than 1,300 used fuel rod assemblies, packing radiation 14,000 times the equivalent of the Hiroshima nuclear bomb, need to carefully be removed from their cooling pool.
Arnie Gunderson, a veteran US nuclear engineer and director of Fairewinds Energy Education, told Reuters that "they are going to have difficulty in removing a significant number of the rods," especially given their close proximity to each other, which risks breakage and the release of radiation.
Gundersen told Reuters of an incredibly dangerous “criticality” that would result if a chain reaction takes place at any point, if the rods break or even so much as collide with each other in the wrong way. The resulting radiation is too great for the cooling pool to absorb – it simply has not been designed to do so.
"The problem with a fuel pool criticality is that you can't stop it. There are no control rods to control it,” Gundsersen said. “The spent fuel pool cooling system is designed only to remove decay heat, not heat from an ongoing nuclear reaction."
The base of the pool where the fuel assemblies are situated is 18 meters above the ground. The pool itself is 10 by 12 meters, and the rods are seven meters under the surface of the water. One problem with that pool is it has been exposed to air in the 2011 catastrophe, when its roof was blown off by the explosion.
The operation is urgent – because even a minor earthquake could trigger an uncontrolled fuel leak.
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