– Japan Nuclear Prof.: Fukushima plant now a ‘swamp of radioactive material’ — Can’t stop pumping in more water because they don’t know where melted fuel went — Build roof over entire site? — Asahi: Continued presence of water threatens construction of ice wall around reactors (ENENews, July 13, 2014):
Interview with Professor Hiroaki Koide, Kyoto University Reactor Research Institute, translated by Fukushima Diary, July 13, 2014: Fukushima plant is now like a swamp of radioactive material due to the contaminated water […] Tepco should quit cooling with water since one year ago. However from Tepco’s assumption, it is impossible to shift to air cooling because they can’t identify the exact locations of molten fuel.
More from interview with Professor Koide, translated by Google: I think of that accident of Fukushima […] the human race has been encountered for the first time […] Rather than the cooling in the water, should switch as soon as possible to the cooling method of another I think. […] I thought the most part rain is falling on the site […] so, I cut off the rain. In other words, it is such as paving the entire site. I think I think in some cases, that I would build a roof on the entire site […] in the premises of the Fukushima Daiichi nuclear power plant, but is in a state such as the swamp of radioactivity […]
Asahi Shimbun, July 9, 2014: 11,000 tons of contaminated water [are in] underground trenches connected to the No. 2 and No. 3 reactor turbine buildings. […] contaminated water began seeping into them after the onset of the March 2011 nuclear crisis. If the contaminated water is not removed from the trenches, it could eventually leak out. The Nuclear Regulation Authority instructed TEPCO to promptly remove the water, calling it the “most serious source of concern.” […] But TEPCO officials said the ice walls failed to form because of the constant flow of a maximum 2 milliliters of water per minute around the connecting points. Toyoshi Fuketa, an NRA commissioner, has instructed TEPCO to come up with steps to resolve the matter by the end of July, arguing that the frozen walls should be able to withstand certain levels of water flow under normal circumstances. The continued presence of water threatens to prevent the creation of outer frozen soil walls encircling the No. 1 through No. 4 reactors, which are a central part of TEPCO’s plans to reduce the amount of contaminated water at the plant.