Nuclear fuel in the reactor cores melted after the magnitude 9.0 earthquake and tsunami in March 2011 caused the Fukushima Daiichi nuclear plant's cooling systems to fail
That kinda depends on exactly what it is removed and how. Being exposed to radiation doesn’t make you radioactive. Ingesting radioactive particles will kinda make you radioactive until those particles reach their end of life and fission. I would be surprised if the robot is actually radioactive once it is done, but I wouldn’t be at all surprised to find out that the structural integrity of the robot has been compromised due to exposure to radiation.
Source: former Navy Nuclear Power Program Electronics Technician Instructor.
Be really interested to know what it’s made out of. Had a coworker who used to work in forgings and did some stuff that got sent to nuclear plants, they said that they had really strict requirements on material compositions, specifically needed to ensure that the (think it was steel, may have been something else) material had basically no traces of cobalt in it because the cobalt would becomes radioactive over the service life.
There are several factors to consider when choosing materials in a nuclear plant. For things that aren’t in direct proximity to the reactor core, neutron activation (becoming radioactive) is less of a concern. Aluminum produces hydrogen gas when exposed to boric acid, which presents an explosion risk. Certain chemical compounds can cause corrosion to plant equipment, even a Sharpie marker could corrode a valve or pipe and cause issues over the 50 year life span of a plant.
Depends heavily on the kind (and intensity) of radiation. Beta (electron/positron) and gamma (photon) generally won’t, but neutron and alpha can. Many of the atoms that become radioactive will rapidly decay, and that’s one of the mechanisms behind the impact to structural integrity.
That kinda depends on exactly what it is removed and how. Being exposed to radiation doesn’t make you radioactive. Ingesting radioactive particles will kinda make you radioactive until those particles reach their end of life and fission. I would be surprised if the robot is actually radioactive once it is done, but I wouldn’t be at all surprised to find out that the structural integrity of the robot has been compromised due to exposure to radiation.
Source: former Navy Nuclear Power Program Electronics Technician Instructor.
Good question
Be really interested to know what it’s made out of. Had a coworker who used to work in forgings and did some stuff that got sent to nuclear plants, they said that they had really strict requirements on material compositions, specifically needed to ensure that the (think it was steel, may have been something else) material had basically no traces of cobalt in it because the cobalt would becomes radioactive over the service life.
There are several factors to consider when choosing materials in a nuclear plant. For things that aren’t in direct proximity to the reactor core, neutron activation (becoming radioactive) is less of a concern. Aluminum produces hydrogen gas when exposed to boric acid, which presents an explosion risk. Certain chemical compounds can cause corrosion to plant equipment, even a Sharpie marker could corrode a valve or pipe and cause issues over the 50 year life span of a plant.
That’s really interesting about Sharpies, I would have never known that about Sharpies.
Edit: I accidentally the word “never” above.
Depends heavily on the kind (and intensity) of radiation. Beta (electron/positron) and gamma (photon) generally won’t, but neutron and alpha can. Many of the atoms that become radioactive will rapidly decay, and that’s one of the mechanisms behind the impact to structural integrity.