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| Entered date | Event description | |
|---|---|---|
| ENS 49404 | 3 October 2013 09:20:00 | At 0643 EDT (on 10/03/13), during reactor startup, with the reactor critical and power in the intermediate range, an automatic reactor scram occurred due to an invalid (noise) intermediate range monitor (IRM) scram signal processed on both RPS trip systems. All control rods fully inserted and plant response was as expected. This notification is in accordance with 10CFR50.72(b)(2)(iv)(B). The reactor is currently subcritical. When the reactor scram occurred, reactor power was below the Point of Adding Heat and had minimal effect on the plant. Normal offsite power is being maintained. Decay heat is being maintained via normal shutdown cooling. The Licensee has notified the NRC Resident Inspector. |
| ENS 48537 | 27 November 2012 00:02:00 | Pinhole leak discovered on a Reactor Head Spray line weld during Nuclear Steam Supply System Leak Test. Oyster Creek Nuclear Generating Station is currently in the Shutdown Condition executing Refueling Outage 1R24, which includes Nuclear Steam Supply System (NSSS) Leak Testing, prior to startup. At 1930 on 11/26/2012, a pinhole leak was discovered on a Reactor Head Spray Class 1 piping weld. The leak was discovered during the NSSS Leak Test, while the Reactor was in the Shutdown Condition. The leak is on a flange to piping weld on the Reactor Head Spray system upstream of the N-7B nozzle. Water was found to be weeping from the pinhole leak (approximately 2 to 3 drops per minute). The cause is under investigation and corrective action plans are being developed. The leak has been evaluated by Exelon and determined to meet the criteria for reporting identified in NUREG-1022: Welding or material defects in the primary coolant system that cannot be found acceptable under ASME Section XI, IWB-3600, 'Analytical Evaluation of Flaws,' or ASME Section XI, Table IWB-3410-1, 'Acceptable Standards.' The NRC Resident Inspector has been informed. |
| ENS 47213 | 28 August 2011 11:13:00 | Oyster Creek has lost 10 sirens in the Emergency Plan Zone. Communications with the Ocean County Office of Emergency Management has been conducted to inform them of the outage. The licensee has notified the NRC Resident Inspector. |