Probably they are still cooling down the reactors, as least somewhat. The effect is called "decay heat" and does take quite some time to completely dissipate fo

Probably they are still cooling down the reactors, as least somewhat. The effect is called "decay heat" and does take quite some time to completely dissipate for reactors of that scale. However there is also a lot of groundwater leaking into the basement/reactor complex apparently, which then needs to be pumped back out.