What #Russia occupational forces are doing in #Chernobyl is totally irresponsible but no, the spent fuel is not going to overheat. The newest #nuclear spent fuel in Chernobyl is 22 years old and has already lost most of its activity a decade ago. These scenarios of disconnected power had been tested long ago during #Ukraine and EU joint exercises and confirmed that after two months without electricity the fuel rods temperature would rise to 48°C. All other scenarios, including total loss of water have been also predicted, tested and prevented.

https://snriu.gov.ua/storage/app/sites/1/docs/Stress-tests/National Report of Ukraine.pdf