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| Entered date | Event description | |
|---|---|---|
| ENS 48657 | 8 January 2013 07:05:00 | A planned maintenance evolution at the Oyster Creek Nuclear Generating Station has removed the Technical Support Center (TSC) ventilation system from service. The TSC ventilation system will be rendered non-functional during the course of the work activities. The TSC ventilation is expected to be out of service for approximately thirty six hours from 0505 (EST) to 1700, tomorrow, Jan 9, 2013. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to an alternate location in accordance with applicable site procedures. This notification is being made in accordance with 10CFR 5O.72(b)(3)(xiii) due to potential loss of the TSC. An update will be provided once the TSC ventilation has been restored to normal operation. The NRC resident has been notified.
TSC ventilation was returned to service at 0230 EST. The licensee will notify the NRC Resident Inspector. Notified the R1DO (Newport). |
| ENS 48491 | 7 November 2012 20:18:00 | Oyster Creek Nuclear Generating Station is currently in Cold Shutdown executing Refueling Outage 1R24, which includes in-service inspections. At 1240 EST, General Electric notified Oyster Creek Management of surface indications that were detected by dye penetrant testing. The indications are in the adjacent base material area of the System Pressure Boundary weld. The indications are located Top Dead Center (TDC) of the 3 inch pipe. Indication #1 is upstream 0.7 inches away from the weld toe, the indication is 1.5" long. Indication #2 is downstream 0.2 inches away from the weld toe, the indication is 2.5" long. The depth of the indications are unknown at this time. Initial investigation revealed that there was no moisture or leakage found in the area of the indications. Further investigation is in progress to better characterize the indications. The cause is under investigation and corrective action plans are being developed. The surface defects have 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 48052 | 27 June 2012 20:16:00 | At 1630 EST, Exelon was notified by the NJ State OEM (Office of Emergency Management) that Oyster Creek Emergency Preparedness Siren #25, located in Harvey Cedars, NJ, was inadvertently actuated at 0209 EST and sounded for a period of 2-3 minutes. The siren was inadvertently actuated by Atlantic City Electric when restoring power to the siren. No actual plant emergency existed. Siren #25 and all other of the 42 sirens remain functional. No other reportability thresholds have been met or exceeded. State and local authorities were also notified. The licensee will notify the NRC Resident Inspector. |
| ENS 44822 | 1 February 2009 23:05:00 | At 2156 EST, a fire occurred on Main Transformer M1A. The loss of the main transformer resulted in a reactor scram from full power without complications. The transformer deluge system activated. The fire brigade responded and offsite assistance from the fire department was obtained to help extinguish the fire. The fire department has since departed the site. An Unusual Event was declared at 2211 EST based on the transformer fire lasting longer than 15 minutes. The fire was extinguished at 2227 EST. A fire reflash watch was established. There was no damage to any other equipment besides the main transformer. During the reactor scram transient, the isolation condenser actuated as expected and was subsequently secured. Four electro-magnetic relief valves actuated and reseated normally. The plant is currently in hot standby with reactor pressure at 927 psi and water level at 150 inches with all conditions stable and a normal electrical configuration. The licensee is assessing the criteria for exiting the UE at this time. The licensee has notified State and local government agencies and the NRC Resident Inspector.
The licensee terminated the UE at 2337 EST due to stable plant conditions with all entry criteria for the UE exited and no concern of reflash. The licensee did note that there is an oil sheen on the water around the transformer and indication of a small amount of oil dripping from the transformer. The licensee is taking efforts to contain the spill with spill kits and barriers. The NRC Resident has been notified. Notified R1DO (Schmidt), R1 (Bellamy), NRR EO (Blount), and IRD (McMurtray). Informed DHS (Banner) and FEMA (Barden).
Upon review of the electromagnetic relief valve performance during the reactor scram at 2156 EST on 2/1/09, two electromagnetic relief valves opened - not four (as originally reported). Due to subsequent seat leakage of one electromagnetic relief valve, the valve was cycled and was able to be reseated. At 0444 EST on 2/2/09 downstream relief temperatures confirmed that the valve had reseated. The licensee has notified the NRC Resident Inspector. R1DO (Schmidt) notified. |