Yesterday TEPCO was once again dropping an unknown device into reactor building 1.
I have speculated for some time that TEPCO is injecting nitrogen with a device I've seen lowered many times, but several commentators at this blog suggested that the device may be spraying some material to keep radioactive dust down.
Here is a link to some close-up screenshots of the mysterious device I took last month: http://majiasblog.blogspot.com/2017/01/fukushima-daiichi-nitrogen-device.html
Here is a screenshot from yesterday:
Unit 3 area emissions continue to look bad (between 6 and 7 on a 10 point scale derived from 5 plus years watching the plant)