The crane was 2 years old it seems (designed to last 20 to 25 years), and went through annual inspection 3 months ago, and daily test. So? Ok, failure can happen. it seems the worst place for it to happen, though...The video of the falling crane is here:
https://www.youtube.com/watch?v=J_SA3G1X7F4&feature=player_embedded (around 1'33).
Everything is under control at Fukushima, it seems...
Hotter water rises, colder water goes down. Thus, if there is a dense heap of warm corium somewhere down there, water will convect around that, and "smear" thermal energy over the entire water volume. The hotter that lump of corium becomes, the more efficient convention is. In a limiting case, water can boil, and thus ensure that temperature stays below 100 C. However, I think such temps are very improbable today.i have a hard time imagining how the "cooling" works with the injection of the water by Tepco. I mean, nobody knows where the fuel/corium is, but it's very probable that it has relocated outside of the reactor vessel or the containement vessel. It's maybe below the reactor somewhere on or in the basement, and maybe for reactor N°2 somewhere else, in the torus area...
To cool, you need to remove heat, and this is done by a flow of something, in this case of water. But the flow has to be to some degree, to be efficient, in contact with the hot fuel, debris and or corium. Then the question is: how do they manage to create a flow path to reach the hot stuff that is "somewhere" (they don't know where), and probably somewhere down, i mean in a low area which is probably "blind". How then a flow could be created in such an area?
Well, as ABE said, no need to worry about contaminated water, it's under control...The operator of the crippled Fukushima Daiichi nuclear plant says it has found rising tritium levels at a monitoring well near a wastewater storage tank.
One of the storage tanks leaked more than 300 tons of highly radioactive water in August. The water is likely to have seeped into the soil.
Tokyo Electric Power Company has since increased the number of monitors to check radioactive materials in groundwater near the tank.
The company says the level of radioactive tritium at one of the wells rose to 64,000 becquerels per liter on Tuesday, more than twice the reading the previous day.
The well is located 20 meters north of the leaking tank. Engineers checked soil taken when the well was dug and found beta radiation of 0.1 millisieverts an hour.
Beta rays are kind of radiation emitted from tritium and other substances.
The operator suspects the leak is spreading but says it doesn't know why as the well is not located near to the groundwater flows. It says most of the contaminated soil around the tank has been removed.
The company initially planned to pump up clean groundwater and release it into the ocean before it passes through heavily contaminated reactors buildings. The finding that the groundwater is already tainted before its reaches the buildings may hamper that plan.
if you count in this documentHowever, the 300000 tons of water in that giant tank farm currently contain far, far worse isotopes (say, Sr-90) in high concentrations.
http://www3.nhk.or.jp/nhkworld/english/news/20130913_36.html [Broken]TEPCO official: Leakage 'not under control'
A senior official from the Tokyo Electric Power Company has acknowledged that the radioactive water leakage at the crippled Fukushima Daiichi plant is not under control.
The government's top spokesman later said the assessment does not contradict Prime Minister Shinzo Abe's statement, delivered internationally, that the situation in Fukushima is under control.
TEPCO official Kazuhiko Yamashita was speaking at a hearing on Friday in Koriyama City, Fukushima Prefecture. The session was organized by the opposition Democratic Party, with officials from the government and TEPCO taking part.
Yamashita apologized for the radioactive water leaks, saying that what's happening now goes beyond TEPCO's assumptions.
A lawmaker asked if Yamashita agrees with Abe's statement made last Saturday at a general meeting of the International Olympic Committee in Buenos Aires.
Yamashita replied that he believes the current situation is not under control.
Chief Cabinet Secretary Yoshihide Suga later told a news conference that he heard Yamashita made the comment after being pressed several times for an answer.
Suga said government officials have confirmed with TEPCO that Yamashita was speaking in reference to independent incidents, including a leak of radioactive wastewater from a storage tank at the plant.
Suga said that even if such independent incidents take place, multi-layered steps will be taken to prevent the radioactive water from contaminating the ocean.
Suga said it is true that tainted water has leaked from a tank. But he said workers' patrols of storage tanks have been increased from once to 4 times per day, as part of all-out efforts to urgently deal with the problem.
Another update from TEPCO and yet again, absolutely nothing covered other than the water issues. Status of the clean-up of the units? Fuel removal from Unit 4 SFP? Removal of the Unit 1 cover? Location of the cores? And on and on.http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2013/images/handouts_130913_01-e.pdf
What's most interesting:
- graph on page 24: the water flow direction might be even now reversed, it's flowing in from the ocean, at least at that point
- first graph on page 17
The water issues are, which actually most concerned by 'the public'.Another update from TEPCO and yet again, absolutely nothing covered other than the water issues. Status of the clean-up of the units? Fuel removal from Unit 4 SFP? Removal of the Unit 1 cover? Location of the cores? And on and on.
Well... Once they will be able to remove Sr (and some other elements) they should dump that water somewhere. Even if I prefer places where it'll be isolated for some time (this includes some natural reservoirs deep below), it would do practically nothing even if they mix it well in the ocean.Ah yes. That's why he's advocating the dumping of contaminated water. Okay.
Others have pointed out documents that give some clue as to timescales for some of these tasks, though I'd have to go back over a mess of documents to fill in some of the remaining gaps. I'll return to some in the coming hours or days but for now I will just deal with core location surveys.Another update from TEPCO and yet again, absolutely nothing covered other than the water issues. Status of the clean-up of the units? Fuel removal from Unit 4 SFP? Removal of the Unit 1 cover? Location of the cores? And on and on.
Thanks for posting.