Total 25 workers from Hitachi, 4 workers from TEPCO got the maximum 3.81 millisievert exposure for an hour and 40 minutes work on Wednesday October 24, 2012. TEPCO says they didn't use drones because the balloon was successful.
Successful. The drones might have saved the workers from 3.81 millisievert radiation exposure.
The balloon measured radiation levels on the way up the shaft. The level was highest on the 2nd floor, at 150.5 millisieverts/hour. The operating floor (5th floor) was also high, at 53.6 millisieverts/hour at 1 meter off the floor.
From TEPCO's Photos and Videos page (Japanese), October 24, 2012:
Balloon:
Balloon moving up the shaft:
Looking toward north:
Spent Fuel Pool - a white reflection in the lower left corner is the surface of the water, according to TEPCO:
More photos at the link.
Radiation levels, from TEPCO's handout:
Jiji Tsushin wondered in its article why the radiation level was so high on the 2nd floor. They seem to have forgotten that that's where more than 1 sievert/hour radiation was measured back in May last year. The survey meter went overscale.
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4 comments:
25 times almost 4 millisieverts equals almost 100 person-millisieverts.
In total, this was two workers' annual radiation allowance, just to take a few pictures and measurements.
I guess they considered building a worker elevator into the shaft to bypass the highly-radioactive stairways, but at 50+mSv/h there will probably have to be done some remote-controlled cleanup like at #3 first.
Off-Topic:
Interesting article about the contamination of fish off the East coast. Published in 'Science' magazine
Fishing for Answers Off Fukushima
http://www.sciencemag.org/content/338/6106/480.summary
http://www.sciencedaily.com/releases/2012/10/121025150359.htm
"The drones might have saved the workers from 3.81 millisievert radiation exposure."
Yeah but the mechanical drones cost money the flesh drones are way cheaper.
The first picture looks like a parade day blimp does Hitachi make light bulbs? Maybe it's a left over balloon from a product convention.
http://www.bulbman.com/index.php?main_page=product_bulb_info&cPath=12036_12045_12053&products_id=15919
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