Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 49200 | 17 July 2013 17:36:00 | Today, July 17th, 2013, at approximately 1605 EDT, the New Jersey Department of Environmental Protection was notified that approximately 1 pint of sodium hypochlorite was spilled onto the lands of the State of New Jersey. The spill has been contained and cleaned-up. There was no actual or potential impact on the environment and no impact on the health and safety of the public or onsite personnel. Due to notification of a government agency, this event is being reported under 10CFR50.72 (b)(2)(xi). The spill did not reach the federal reportable quantities limit. The licensee has notified the NRC Resident Inspector. |
| ENS 48450 | 29 October 2012 16:15:00 | On October 29, 2012, at approximately 1500 EDT, ANS, the licensee's provider of siren maintenance, reported a loss of 12 out of 43 sirens in the Oyster Creek Emergency Planning Zone, which exceeded the licensee's reporting threshold of 25 percent or more sirens out of service. At 1600 EDT, ANS, updated that the number of sirens out of service was 21 out of 43 sirens. ANS and the licensee continues to work to rectify the issue. The NRC Resident Inspector will be notified.
As of 0320 EDT on 10/30/12, it was determined that 36 of the 43 Emergency Planning Zone sirens were out of service, and the licensee continues work to rectify the issue. The NRC Resident Inspector will be notified. Notified R1DO (Caruso) and IRD (Marshall). |
| ENS 47746 | 15 March 2012 08:32:00 | A planned maintenance evolution at the Oyster Creek Nuclear Generating Station will remove the Technical Support Center (TSC) ventilation system from service. Therefore, 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 six hours from 0800 (EDT) to 1400 today. 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 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 has been notified.
The TSC was restored to service on March 15, 2012 at 1107 EDT. The licensee will notify the NRC Resident Inspector. Notified the R1DO (Krohn) |
| ENS 47107 | 29 July 2011 01:02:00 | At 2115 on 7/28/2011, Oyster Creek experienced a fish kill of greater than 100 fish caused by a loss of the thermal dilution plant power. The loss of thermal dilution plant power was based on a faulted breaker in the Oyster Creek/JCP&L substation. The reported failure was a relay failure inside a 34.5KV substation breaker. Oyster Creek is holding at 53% power until thermal dilution is restored for environmental limitations. The New Jersey Department of Environmental Protection has been notified. The NRC Resident Inspector will be notified. |
| ENS 46820 | 4 May 2011 17:57:00 | Oyster Creek has been informed of a change in its vendor's calculation of Peak Cladding Temperature (PCT) and the Maximum Local Oxidation (MLO) that is based on corrections to errors in the previous calculation of record the vendor has identified. Based on 10 CFR 50.46 Appendix K inputs and assumptions, the correction of errors resulted in an increase of 115 degrees F in the PCT for GE11 fuel and 145 degrees F for the GNF2 fuel. The impact on the MLO due to these errors resulted in an increase of 16.0% for GE11 fuel and 33.0% for the GNF2 fuel. To ensure compliance with the 10 CFR 50.46 requirements, administrative Maximum Average Planar Linear Heat Generation Rate (MAPLHGR) limit adjustments have been applied to bring the PCT and MLO limits below the 10 CFR 50.46 criteria of 2200 degrees F and 17% acceptance criteria. The current LOCA analysis of record remains applicable with the applied MAPLHGR limit adjustments. This notification is being made as a result of the 10 CFR 50.46(a)(3)(ii) requirement to report this issue in accordance with 10 CFR50.72 and 10 CFR50.73. Based on current core thermal power level and existing margin to limits on power operation there is sufficient margin for analyzed accident scenarios requiring ECCS operation including appropriate MAPLHGR compensation to restore the PCT and the MLO within 10 CFR 50.46 acceptance criteria and therefore there is no impact on safe operation. As a result of the MAPLHGR limit adjustment the current LOCA analysis of record remains applicable and therefore, the offsite dose is still bounded by our current safety analysis. Therefore this event is not significant with respect to the health and safety of the public. Corrective Action(s): (1) Administrative adjustments to allowable MAPLHGR limits have been imposed to restore the applicability of the current LOCA analysis of record. (2) Revised MAPLHGR limits have been provided by the fuel vendor and will be implemented into the plant monitoring system, followed by removal of the administrative adjustments to the MAPLGHR. (3) A 10 CFR 50.46 report will be submitted within 30-days. The licensee will notify the NRC Resident Inspector. |