Fukushima I Nuke Plant: 2 Sieverts/Hr on Water Surface in the Reactor Bldg Basement??, EX-SKF, August 4, 2011:
[...] TEPCO says that their plan to treat all the highly contaminated water at the plant is more or less intact; if not by the end of the year as planned, at least by the end of February next year.
This worker is worried that if that means lower or no water in the basement, the basement could become so radioactive; he thinks the melted fuel is in the basement. [...]
I have no way of verifying anything he says, but here are some of the things he tweeted:
Water shields radiation. If there’s no water [in the basement], the highly radioactive materials will be exposed. The radiation level at the surface of the contaminated water in the basement of the reactor building is 2 sieverts/hour, and the half value layer of water is about 19 centimeters, and the water is 4 to 5 meters [400 to 500 centimeters] deep…
It could be an outrageous level of radiation… I don’t think they can empty the basement… Personally I think the melted-through fuel dropped through the ICM [In Core Monitor?] pipe or RPV drain to the bottom of [or below?] the pedestal, but no way of knowing how much of the fuel is there unless you go there and look.
Well, if a worker at the plant like me worries about it, I’m sure TEPCO and the government have already thought about it and come up with the solution. But that’s my concern.
Published: August 5th, 2011 at 11:58 am ET