[Reactor4] Taken fuel assemblies were 100 times more radioactive than normal

Following up this article..[Reactor4] Photos and videos to take out the new fuel assemblies

Actual Fukushima worker Happy11311 commented they measured 2~3 mSv/h from the taken new fuel assemblies of SFP4, which is about 100 times higher than usual.


[Reactor4] Taken fuel assemblies were 100 times more radioactive than normal



It took 2 days to take out the fuel assemblies from 7/18 to 7/19.  I heard the radiation level was 2~3 mSv/h on surface of fuel assemblies. It is not so different from what I expected. They decontaminated them only by rinsing and wiping, but it could be lower if they decontaminated them more carefully.


200 ~ 300mREM/hr is quite high. The radiation level of normal new fuel assembly is only 1/100 of that ?


According to Tepco’s official announcement, it was 50μSv/h after decontamination. It was 2mSv/h just after taken out. The reason why the radiation level was so high is they were cutting shroud on DSP side before 311 [Link], highly radioactive chips can be attached. I don’t think they are activated.





About this site

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.


July 2012