where the carbon-based workers would have to go in to install the gas management system, which would filter the gas coming out of the Containment Vessel to capture radioactive materials and release it outside.
One minute of work at that location would get a carbon-based worker over 21 millisieverts radiation. One second 360 microsieverts.
As I said before, a futile window-dressing, as the CV have been breached somewhere already. It is absolutely crazy, bordering criminal, to send workers there for a cosmetic, token work.
First, as Mainichi Shinbun (11/16/2011) reports it:
TEPCO announced on November 16 that 1,300 millisieverts/hour [or 1.3 sievert/hour] radiation was measured in the northeast corner of the reactor building 1st floor of Reactor 3 at Fukushima I Nuclear Power Plant. It is the highest radiation level so far measured inside the Reactor 3 reactor building.
On November 14, a robot wiped off the water on the rail that is used to move the concrete door of the Containment Vessel [of Reactor3], and detected the radiation at 10 to 20 centimeters off the floor. The robot was sent in to prepare for the work to install the "gas management system" that would clean the gas inside the Containment Vessel and release the cleaned gas into the atmosphere. TEPCO's Matsumoto said, "It is possible the pressure inside the Containment Vessel rose after the accident and that radioactive materials leaked".
In the reactor building of Reactor 1, over 5,000 millisieverts/hour [or 5 sieverts/hour] radiation was measured in August.
Leak from the Containment Vessel "possible"? (Matsumoto is the master of understatement; he is good at presenting a ridiculous idea with straight face - like when he announced bath salt tracer.)
Back in April, New York Times quoted an anonymous Japanese nuclear industry insider saying there was a huge, vertical crack in the Containment Vessel of Reactor 3, and that the crack was getting wider. That reference was removed several days later after the article was published. (I copied what remained in the cache. I'm looking for it now.)
As to more than 5,000 millisievert/hour radiation in Reactor 1, we were never told how much "more than 5,000".
Now here's what TEPCO released to the press on November 16, 2011. The robot seems to be one of the Packbots. The radiation levels in the area where 1.3 sievert/hour radiation was detected are universally high, as you see in the page 1 of the handout below: