JP PM Noda asserted all the parts of the container vessels are cooler than 100℃ so they declared cold shutdown.
However, on 12/26/2011, Tepco announced they will drill into the container vessel to check the temperature of inside by using an endoscope.
Tepco admits melt through is happening at reactor 2 at least and reactor 3 uses MOX so they can not get close. This is why they try to check the temperature of the reactor 2, but it means they don’t know how hot it is actually.
They are planning to do it by mid January but they admit they won’t be able to see the melted fuel somewhere near the vessels.
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.