I'm talking about the rods they keep in the water tanks. Literally all I'd have to do is get some explosives in there - and these things are almost literally guarded by rentacops - and boom, at least a million people dead.
The fuel in every commercial reactor is never enriched enough to go critically boom. Fukushima had a triple meltdown and had 200 workers day and night operating within it. The amount of people killed would be about 0; unless of course the explosives themselves killed any unlucky workers.
So you'd have to target a military station, which is surprisingly enough, guarded by the military.
Fukushima killed a good 30 workers, maybe more. Standing in radioactive water tends to do that.
And Xantalos isn't talking about the power plants, he's talking about the spent fuel bassins. Ie, where they keep the long term radioactive waste 60 years before it goes under the ground.
But his plan gravely overstates the danger of those things. They don't produce nearly enough heat to melt, let alone vapourize themselves*. Cooling is possible, and the containers they're stored in can keep them cool/safe for some time, Even if the basin was destroyed. And if IRCC, most of these depots are guarded on site, ie, near the reactor. And the guards are allowed to kill.
Besides, we had accidents at spend fuel depots earlier. Nothing much happened.
*The only radioactive gasses will be vapourizing water, and then again, the danger from radiation is gravely overstated. Tsernobyl launched an entire reactor core in the air over Eastern Europe, total deaths, including cancers and such, will be less than 10 000 (WHO).