Nuclear Pipe Patterns in the Sky

I was watching the top of large metal structure sitting on the ground.  It had a spout similar to a pressure cooker but I knew this was much more important than some meal cooking.  This was serious this was perhaps nuclear.  I waited and watched as the pressure continued to build.  I was frightened.  It blew.  I was astonished as I saw huge black metal pipes dozens of feet around whirl into the sky.  The pipes reached upwards and twisted sideways and made patterns and shapes.