That would have been prudent. But, this cluster of six plants provides something like a quarter or a third of the Ukraine's power. Scramming all plants in the facility would have to produce massive blackouts, which so far, I haven't heard about.
PLANT SUPERVISOR: "Uh, okay. Here is the situation. We have Russian troops within artillery range by 1500 this afternoon. Do we want to continue to generate power until we see the whites of their eyes and risk a hit on the power to the control room or control room itself (which would make it impossible to lower the rods except manually with gravity) or even a hit to something that might damage the ability to lower the control rods themselves at all resulting in explosions, meltdowns, and complete destruction and radioactive contamination of the entire country and the world..., or do we cut off the power, lower the rods in now before they get in range to do any artillery damage to prevent that. Show of hands please for those who want to keep the rods up until the Russian invaders can begin hitting us with explosive shells or they come down the road?"
WORKERS: (one hand is raised, everyone turns their heads slowly to look at who it is)
PLANT SUPERVISOR: "Right. You can put your hand down, Igor. Er, all those who want to put the rods down now, cutting off power to hundreds of thousands of people, but preventing explosions, meltdowns, and complete destruction of the plant and radioactive contamination of the entire country and the world...raise your hands please."
WORKERS: (Everyone raises their hands, even Igor)
PLANT SUPERVISOR: "Igor, you can't vote twice."