I read IAEA inspectors are on the way to inspect the Ukraine power plant taken hostage by Russia. I presume nobody ever thought it would be useful or necessary

I read IAEA inspectors are on the way to inspect the Ukraine power plant taken hostage by Russia. I presume nobody ever thought it would be useful or necessary, but why is it not part of nuclear power plant protocols to have installed a (perhaps solar powered) MCA (multi channel analyzer) with a relatively passive uplink? Passive uplink could be anything creative like a simple single pixel LCD shutter over a corner cube / retroreflector, so transmission doesn't take much power... EDIT for clarity: this MCA ground station can refuse to modulate until it recognizes a signed optical transmission through downlink (from satellite or spy plane), and thus only modulate LCD when it is queried by IAEA / allied nations. The modulation of course allows subtracting the background (i.e. sunlight, but also satellite modulated light reflections that did not pass the LCD modulation). This way adversary has a hard time locating the device from above as the allies can refuse to query the MCA-groundstation when adversary planes or satellites are overhead. Instead of a retroreflector covered by a single pixel LCD an alternative could be a mirror covered by an LCD placed at the focal distance of a lens, such that it can only be queried from a certain direction...