Fukushima Daiichi Unit 2, visible on the TEPCO 1 Cam, always has a cap of visible heat emanating from a particular location on the roof.
The screenshots don't capture the streaming motion of the cap but you can see the blue-purple and green heat signature:
In early February, TEPCO reported very high radiation levels around the external foundation of unit 2:
Lethal radiation amounts still detected at crippled Fukushima plant 7yrs after disasterWhere is Unit 2's missing fuel and why is that reactor so much hotter than the rest?
feb 3 2018 https://www.miragenews.com/lethal-radiation-amounts-still-detected-at-crippled-fukushima-plant-7yrs-after-disaster/
A remote-controlled inspection detected 42 Sieverts (Sv) per hour of radiation outside the foundations of the crippled Unit 2 of the plant.