How was a catastrophic release of radioactivity prevented after the Russian drone attack on the Chernobyl reactor sarcophagus?

A catastrophic release of radioactivity was prevented due to expert nuclear monitoring at the Chernobyl site. This monitoring is maintained by the National Nuclear Security Administration (NNSA), which is part of the U.S. federal government. The presence of these specialized personnel enabled proper assessment and response to the drone attack situation, preventing what could have been a severe nuclear incident. This highlights the critical importance of having expert nuclear monitoring personnel at radioactive sites to ensure safety and prevent disasters.