Is Russia about to go NUCLEAR?

Ukrainian President Zelensky says that the Russians are preparing to attack the Zaporizhzhia nuclear power plant with explosives that they placed on the roof. That plant is under Russian control. Why exactly would they do this? Russia has also asked the International Atomic Energy Agency to come and secure this plant and inspect the shelling of this plant for months. They have refused to do so. Would Ukraine do this as a false flag after a failed counteroffensive? It is hard to believe that the country that is home to Chernobyl would do such a thing but the counteroffensive is now a bust.