In this level of radiation, even a disaster dealing robot is collapsed within less than 2 hours.
In Fukushima plants, robot called Quince is used, which is developed by Chiba institute of technology and Tohoku university. Assistant professor Mizutani from Tohoku university states,
“The bottle neck to develop a robot for radioactive circumstances is the semiconductor. Semiconductor is extremely sensitive for radiation. Semiconductor parts of robot used in space are shielded by lead, which is against gamma ray, but lead can’t be used for Quince because it kills cavalry.Technical specification requires Quince to stand only over 3Sv/h. In total, it’s just over 100Sv.”
With this level of the specification, Quince can’t last longer than 2 hours in reactor2. If it’s 3Sv/h to stand, Quince can’t last longer than 1 hour and 20 minutes.
This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.