The first and only time I saw an particle accelorator at a commercial nuclear plant was at the Pilgram 84' piping replacement. It was used to "radiograph" the safe end welds. Management did not appreciate someone announcing evacuation of the reactor building during operation of the "Death Ray".
8)
Cyclotrons – What are They and Where Can you Find Them
https://www.iaea.org/newscenter/news/cyclotrons-what-are-they-and-where-can-you-find-them