Tepco admitted they observed black smoke twice from Reactor 3 late March 2011
Following up these articles..
US navy was reported they measured 1.5 mSv/h Thyroid Dose in area south of Tokyo [URL 1]
3/21/2011-The day G.Washington evacuated Yokosuka, possible explosion happened in reactor3 to melt the concrete of PCV [URL 2]
On 12/17/2015, Tepco admitted that they observed black smoke rising up from Reactor 3 building from 21st to 23rd of March 2011. This is mentioned in one of their reports titled “unidentified accident analysis”. (cf, Tepco reported radiation level of Reactor 2 suddenly dropped just after Reactor 4 blasted during 311 [URL 3])
According to Tepco, around 16:00 of 3/21/2011, black smoke was observed at South East part of Reactor 3 building. This time, the radiation level increased by 1,400 μSv/h at the main entrance of Fukushima plant. About the same time of 3/23/2011, the black smoke was observed again.
Regarding this smoke, Tepco comments they assume oil of a plant equipment caught fire. However they also state there were least combustible material in the plant, which contradicts the former comment of themselves.
The detailed analysis of the black smoke is not reported.
Selon Tepco, le 21 mars 2011 vers 16:00 une fumée noire a été vue sortir du sud-est du bâtiment du réacteur 3. Cette fois le niveau de radioactivité était monté de 1 400 µSv/h à l’entrée principale de la centrale de Fukushima. Le 23 mars 2011 à peu près à la même heure, cette fumée noire a de nouveau été observée.
Tepco déclare sur ces fumées qu’ils pensent que de l’huile d’un appareil de la centrale avait pris feu. Ils affirment cependant aussi qu’il restait moins de combustible dans la centrale, ce qui contredit leur propre déclaration précédente.
L’analyse détaillée de la fumée noire n’est pas communiquée.
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.