|Unit 4 workers welding illustration|
I've been busy with other things lately so I didn't notice the work that was going on top of reactor unit 4. FC pointed out in the chat that there was flashes going on in the bottom right corner of the screen, and sure enough when I looked at the live cam there was even workers moving around there.
Here you can see an ILLUSTRATION showing the location where the welding work is being done on top of reactor unit 4. The actual flashes where much smaller than this illustration shows but the scale of the workers to the right is about the same.
I'm sure you already have read about what happens when that fuel pool hits the ground in the event of an bigger earthquake. The contamination released would equate to some 800-1000 nuclear weapons going off all at once.
And I hope those workers where wearing gas masks because that steel is contaminated with all kinds of radioactive particles, welding always cause smoke and people doing it for a living need regular health checkups to check their lungs.. Add radiation to that smoke and it is not going to turn out good for the workers later on.
Now the camera angle like I told you earlier is different now from what it was when the livecam first was put into place 2011. But we can still see all the reactor units and cranes working on the site. To explain the map, Unit 4 is in the right corner of the screen and we can see part of Unit 1 way back with Unit 2 blocking most of the view (Unit 1 is the white reactor unit because of the tent they put up).
I hope this Fukushima update have shed some light on the recent developments on site.