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originally posted by: Phage
a reply to: burdman30ott6
Are salmon bottom feeders? Because, unless they are, they aren't going to pick up much radioactive material.
Robot probe of Fukushima reactor halted due to glitch
An operation to prepare to examine the inside of the No. 2 reactor at the disaster-struck Fukushima Daiichi nuclear plant was halted Thursday due to a technical glitch, the plant operator said.
Tokyo Electric Power Company Holdings Inc. said it sent a robot with a high-pressure water nozzle into a containment structure housing the pressure vessel, but suspended the work after video images from a camera on the robot became dark.
TEPCO said high radiation levels may have caused the camera glitch. The camera was designed to withstand cumulative radiation exposure up to 1,000 sieverts. Previously the company said up to 530 sieverts per hour of radiation was detected within the reactor containment structure in late January. The radiation reading during the robot operation Thursday was 650 sieverts, TEPCO said.
Also what about the core....
This large but concentrated hole appears to be the failure point for the unit 2 reactor pressure vessel (RPV). Melted fuel (corium) likely flowed through this hole and collected into the sump in the containment structure floor. The slow failure and small opening melted through the RPV likely allowed the molten fuel to burn down as it collected in the sump. This new visual evidence shows conditions that could have led to the molten fuel burning down into the reactor building concrete basemat. Without sufficient cooling, it could have potentially burned down through the basemat.
In this case, specifically, there is no evidence that core slag melted through the containment vessel.
The dose rate from a used fuel assembly could be as high as 10,000 R/hr at 1 meter. You would receive a lethal dose within minutes if unshielded and recently removed from the reactor. The good news is that alarms would go off long before you ever got near the fuel bundle. You would be evacuated and the bundle would be submerged before you ever were exposed to the bundle.
This video is not from a spent fuel assembly as others have pointed out. The dose rates from new fuel is negligible. You can stand next to new fuel without receiving any real dose (you would get more from the surroundings than the fuel itself). When new fuel arrives, it is inspected and channeled. After being channeled, it is placed in the fuel pool where it waits to be loaded into the reactor.
Guess what, there's no evidence to the contrary either.