The large device dangled by a crane at Fukushima Daiichi (I've commented on before at this blog) was actively spraying some thing into Unit 1 today, as these screenshots below reveal.
The first screenshot is a crop from 11:10, and the second is a crop of a screenshot taken 1 minute later when the device stopped spraying.
The third screenshot is from 3 minutes later when the device starts spraying again.
March 4, 2017 11:10
March 4, 2017 11:11
March 4, 2017 11:16
Some of the commentators at this blog have suggested the device is spraying something sticky to keep the radioactive particle contamination down.
These screenshots support that interpretation.
See my update on this post here. It turns out that the device spraying the stuff today is NEW, at least, its not the device I've seen in the past and commented upon at this blog.