Is Unit 1 the Source of the Heightened Emissions that Began About a Week Ago?

I've been watching the heightened emissions at Fukushima Daiichi for the last week trying to figure out what is going on.

It looks to me as if one major source of the heightened emissions is unit 1, particularly from the corner that is closest to unit 2 in the screenshot below (above the circle of light on unit 1's wall):


Today the TBS cam was up and running. It seems as if one can see reddish emissions emanating from the same corner of unit 1 (behind unit 2) on this cam as well, as illustrated by these cropped shots taken a few minutes before the screenshot above (at 1:14 and 1:26 AM March 7, 2016):




In 2011, TEPCO built a tent over Unit 1:

Phred Dvorak and Mitsuru Obe After Nuclear Milestone, a Long Road: Japan Plant's Operator to Hail 'Cold Shutdown,' but Progress Is Halting; Robot Stranded in Hot Zone. The Wall Street Journal, December 16, 2011 http://www.wsj.com/articles/SB10001424052970204336104577096281099680526

...In March [2011], Tepco commissioned a vinyl covering for Unit No. 1, where a hydrogen explosion had blown the roof and walls off its reactor building, exposing much of the fuel containers and plumbing inside. But radiation levels were too high to send people in to do the work, says Masahiro Indo, a general manager in Shimizu Corp.'s construction technology division, who oversaw the job.

Shimizu wanted to have the cover stretched just 20 inches (50 centimeters) from the walls of No. 1, to minimize the structure's size and weight. That would mean exposing the welders and scaffolding workers normally used for such jobs to radiation levels that ranged in some spots from 35 to 150 millisieverts per hour, well over the 1 to 10 millisieverts companies commonly set as the maximum exposure for one mission. "We would have had to arrange the work in shifts that lasted minutes, which would have meant a huge number of workers,'' Mr. Indo says.

So Shimizu preassembled the pieces of covering in modules, attached to steel beams. Typically, workers would join such beams with welds and bolts. Shimizu outfitted these to snap together. To avoid using workers to guide the modules into place, Mr. Indo says Shimizu had each one rigged with as many as eight electric fans, which could be turned on or off to rotate the pieces as they dangled from a crane. To minimize crane operators' exposure to radiation, Shimizu covered crane windows with lead and outfitted the cabin with video screens that the operators monitored as they worked the controls.They finished the job in October

In 2014 TEPCO started to remove the tent but I think that process was interrupted (see Simply Info here for tent removal process http://www.fukuleaks.org/web/?p=13964) because the World Nuclear Association reported in July 2015 that the removal of the tent from unit 1 began then http://www.world-nuclear-news.org/RS-Removal-of-cover-over-Fukushima-Daiichi-unit-1-begins-2907155.html

TEPCO has been unable to locate the melted fuel from reactor 1 even after using a muon scan, which should have been able to identify the location of the uranium melt.

I am of the opinion that the melted core from reactor unit 1 is located under the plant in the underground river.

I have no idea whether the increased emissions I've noticed this week are from the melted reactor fuel or whether TEPCO is now having trouble with the spent fuel pool located in reactor 1, of which little has been officially acknowledged.