The Three Mile Island nuclear reactor shut down Thursday as part of an automatically triggered response, said an article posted by CNN.
The shut-down was triggered when a reactor coolant pump failed, the article said.
The article also said there was no danger to the public, although a large release of steam made a loud noise heard by those in the immediate vicinity.
If there was any radiation released in the steam, it was below detectable levels, said an article written by NBC.
This is the second time in a month this same reactor has shut down due to a failure, according to an article done by USA Today.
The cause of what caused the pump to fail is still unclear, said the NBC article.