Nuclear Event – Automatic Reactor Shutdown: Oyster Creek Nuclear Power Station, New Jersey
Nuclear Event in USA on Sunday, 20 November, 2016 at 03:42 [EST]
AUTOMATIC REACTOR SCRAM DURING MAIN TURBINE TESTING
“At 0342 EST, an automatic reactor scram was processed during turbine valve testing. All rods inserted into the core as expected and all systems functioned as expected during the scram.
“The event is reportable within 4 hours per 10 CFR 50.72(b)(2)(iv)(B) – any event or condition that results in actuation of the Reactor Protection System (RPS) when the reactor is critical except when the actuation results from and is part of a preplanned sequence during testing or reactor operation.”
The plant response to the reactor scram was uncomplicated. The main feedwater system is maintaining reactor water level and decay heat is being removed by the main turbine bypass valves to the main condenser. The unit is in a normal shutdown electrical lineup. No SRVs lifted during the scram. The licensee was testing the main turbine trip function just prior to the scram. The cause is under investigation.
The licensee notified the NRC Resident Inspector.