This was reported by the US Navy.
“The Seawolf-class fast attack submarine USS Connecticut (SSN 22) collided with the object while submerged on the afternoon of October 2,” the report said.
According to the Navy, the state of the submarine is "safe and stable."
The nuclear power plant was not affected during the collision.
As reported by USNI News, about 11 American sailors were injured as a result of the incident.