Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 53418 | 22 May 2018 15:36:00 | A licensed operator had a confirmed positive test during a random fitness-for-duty test. The individual was not performing licensed duties. The individual's qualifications and plant access were removed. A work performance investigation has been completed. Work performed by the individual has been verified to be compliant with all standards. The NRC Resident Inspector has been notified. |
| ENS 51108 | 1 June 2015 06:57:00 | A planned maintenance evolution at the Oyster Creek 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 sixteen hours and will return to service at approximately 2200 (EDT) June 1, 2015. 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 10 CFR 50.72(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 Inspector has been notified.
At 2240 EDT on 6/1/15, the TSC ventilation system was restored. The licensee will notify the NRC Resident Inspector. Notified the R1DO (Powell). |
| ENS 49633 | 14 December 2013 06:57:00 | Today at approximately 0337 (EST), during quarterly turbine valve testing with reactor power at 100% of rated thermal power, the plant experienced reactor pressure control abnormalities. Reactor pressure rose to 1042 psig (at which point) the Operators inserted a manual SCRAM. The cause of the rise in reactor pressure is currently under investigation. All control rods inserted into the core. Main steam isolation valves remained open, (however), bypass valves did not open as expected. The plant is in its normal electrical lineup and decay heat is being removed via isolation condensers. No electronic (EMRVs) or safety valves lifted during the transient. The plant is currently shutdown and all parameters are stable. This event is reportable within 4 hours per 10CFR50.72(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 pre-planned sequence during testing or reactor operation.' The licensee notified the NRC Resident Inspector and will be notifying the State. |
| ENS 48861 | 28 March 2013 10:15:00 | A planned maintenance evolution at the Oyster Creek 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 fourteen hours and will return to service at approximately 2200 (EDT) March 28, 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 10CFR50.72(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 licensee informed the NRC Resident Inspector.
The TSC ventilation system was returned to service at 1240 EDT. The licensee has notified the NRC Resident Inspector. Notified R1DO (Krohn). |
| ENS 48495 | 8 November 2012 16:55:00 | Prior to 1020 EST on November 8, 2012, 4 out of 42 Emergency Planning Zone (EPZ) Sirens remained inoperable, due to issues caused by Hurricane Sandy. At 1020 on November 8, 2012, Oyster Creek was notified by ANS, the provider of Exelon siren maintenance, that due to the recent snow storm, 11 out of 42 sirens in the Oyster Creek Emergency Planning Zone were inoperable. 11 out of 42 sirens exceeds Exelon's reporting threshold of 25 percent or more sirens out of service. Therefore, an 8-hour report is required under 10 CFR 50.72(b)(3)(xiii) due to a 'Loss of Emergency Preparedness Capabilities.' Prior to the submission of this report, Oyster Creek was notified by ANS that 4 of the 11 inoperable sirens were returned to service. The licensee will notify the NRC Resident Inspector. |