It is bull crap. The station was captured without a fight. Then the Ukrainian groups squatted in the nearby building, opened fire on the Russian patrol and started a fire in the building. Then propaganda spinned it as a battle at the station and sold the smoke from fire as “nuclear disaster”.
It was half a year ago though. Now the situation is different.
What it’s like for Ukrainians working at a nuclear plant under Russian occupation
https://www.npr.org/2022/08/29/1119925635/ukraine-russia-zaporizhzhia-nuclear-plant-interview
Interview Highlights follow article.