Possible, yes. Practical, not really. https://en.wikipedia.org/wiki/Kamioka_Liquid_Scintillator_Antineutrino_Detector https://en.wikipedia.org/wiki/Kamioka_Liq

Possible, yes. Practical, not really. https://en.wikipedia.org/wiki/Kamioka_Liquid_Scintillator_Antineutrino_Detector https://en.wikipedia.org/wiki/Kamioka_Liquid_Scintillator_An... Edit: Ok, let me not be so brief. In short, the current detectors for monitoring reactors are either HUGE (rooms and rooms full of highly purified water, and even those just look at nearby reactors and only get 1 count every 3 days). Or the detectors are very close to the reactor (7 meters i.e. https://www.iaea.org/safeguards/symposium/2010/Documents/PapersRepository/027.pdf https://www.iaea.org/safeguards/symposium/2010/Documents/Pap...). So signal to noise is the main issue first of all.