You should read up on Browns Ferry Nuclear in Alabama. BFN has three reactors but one was taken out of service for decades because an engineer was checking for leaks on a hose using a flame and set the insulation on fire.
Also they had a fin on one of the turbines of another reactor break off and it the reactor wall in the mid-2000s.
Also they had a fin on one of the turbines of another reactor break off and it the reactor wall in the mid-2000s.