Early Saturday morning, operators at the Saint Lucie nuclear power plant in Florida manually shut down the Unit 1 after the Steam Bypass Control Valve opened unexpectedly, causing the steam temperature to drop. Cause of the valve malfunction is under investigation.
There is a question raised by the Event Report: Where does the steam go when that particular valve opens? Is it vented to containment, or is there an atmospheric release? In a number of steam leak incidents, there have been releases of tritium along with the steam.