If they destroy the containment buildings, which might take more than mortar fire then the reactor would probably SCRAM since it's a PWR. There might be a steam

If they destroy the containment buildings, which might take more than mortar fire then the reactor would probably SCRAM since it's a PWR. There might be a steam explosion, and maybe some localized radiation leak. Really heavy arial bombardment could, if it broke containment, spread fissile material around the immediate area, cause a huge fire, and throw some radioactive debris into the air. That would all be quite bad, but not Chernobyl bad. Chernobyl was a graphite pile reactor with no containment building, and none of those exist anymore fortunately. I should aadd that VVER's like the reactor in question have missile shields for precisely this reason, and a bunch of other passive features. It shouldn't explode. 2nd Edit: what I’m concerned about is artillery hitting spent fuel containment. I don’t know if they used hardened casks, or if they’re using pools that might be in a less hardened building. Whoever is shelling this thing is insane, or very stupid.