Graphite isn't commonly used these days in power plants. It's a terrible choice for a moderator when most power plants use water cooling, as hydrogen is a much better moderator than carbon. Unless the nuclear power plant is a molten salt plant. Of which there were only two!
https://www.reddit.com/r/nuclear/comments/w5ucmp/why_arent_graphite_moderated_reactors_more_popular/
