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.

http://www.tepco.co.jp/cc/press/betu15_j/images/151217j0138.pdf

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