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Oyster Creek Declared an Unusual Event HU 6 Hazardous Event for an Abnormal Intake Structure Level Less than or equal to -3.0 feet MSL (Mean Sea Level) on points 23 and 24 in the Main Control Room at time 0524 (EST). The licensee notified the NRC Resident Inspector, State, and local authorities. Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).

• * * UPDATE ON 1/6/18 AT 2325 EST FROM JAMES RITCHIE TO BETHANY CECERE * * *

Oyster Creek Terminated Unusual Event HU 6 Hazardous Event for an Abnormal Intake Structure Level at time 2308 (EST). The licensee notified the NRC Resident Inspector, State, and local authorities. Notified R1DO (Werkheiser), NRR EO (King), IRD MOC (Gott), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).

Oyster Creek Generating Station has experienced a loss of the Technical Support Center (TSC) ventilation system due to an electrical perturbation. If an emergency is declared requiring TSC activation during the time TSC ventilation is non-functional, 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 a 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.

• * * UPDATE AT 0537 EDT ON 07/15/17 FROM JIM RITCHIE TO S. SANDIN * * *

TSC ventilation was restored at 0128 EDT on 07/15/17. The licensee will inform the NRC Resident Inspector. Notified R1DO (Dimitriadis).

Oyster Creek Generating Station has experienced a loss of the Technical Support Center (TSC) ventilation system due to charcoal filter test failure. A charcoal filter replacement is planned. If an emergency is declared requiring TSC activation during the time TSC ventilation is non-functional, the TSC will be staffed and activated using existing emergency planning procedure 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 a loss of the TSC. An update will be provided once the TSC ventilation has been restored to normal operation. The NRC Resident Inspector will be notified.

• * * RETRACTION ON 4/20/17 AT 1447 EDT FROM JIM RITCHIE TO DONG PARK * * *

This is a retraction of ENS notification 52674. After further testing and evaluation, the station concluded that the TSC Ventilation Charcoal filter met the acceptance criteria, and the TSC Ventilation was not inoperable at the moment the original ENS notification was performed. The licensee will notify the NRC Resident Inspector. Notified R1DO (Arner).

Oyster Creek Generating Station has experienced a loss of power to the Site Emergency Building, which renders the TSC ventilation system non-functional until power is restored. If an emergency is declared requiring TSC activation during the time TSC ventilation is non-functional, the TSC will be staffed and activated using existing emergency planning procedure 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)(xii) 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.

• * * UPDATE FROM ANDREW KRUKOWSKI TO JEFF HERRERA AT 1121 EST ON 1/23/16 * * *

Due to a loss of power to the Site Emergency Building the Plant Process Computer needed to be secured. Due to the loss of the Plant Process Computer the Emergency Response Data System (ERDS) functions are not available for communications to the NRC. This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to the loss of �Emergency Response Data System (ERDS) communication capability. The licensee has notified the NRC Resident Inspector. Notified R1DO (Gray).

• * * UPDATE FROM ANDREW KRUKOWSKI TO HOWIE CROUCH AT 1446 EST ON 1/23/16 * * *

Power was restored to the Site Emergency Building. TSC Ventilation and the ERDS systems were returned to service at 1440 EST. The licensee has notified the NRC Resident Inspector. Notified R1DO (Gray).

Today at approximately 0250 (EDT) (on 10/12/14), during a planned reactor power ascension with reactor power at approximately 1% of rated thermal power, reactor water level began lowering. Operators inserted a manual SCRAM at 0251 (EDT) in accordance with station procedures. The cause of the lowering reactor level is currently under investigation. All rods inserted into the core and all systems functioned as expected during the scram. No electromatic (EMRVs) or safety relief valves lifted during the transient. The plant is currently shutdown and plant parameters are stable. This event is reportable 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.' Decay heat is being released to the main condenser and normal offsite power is being maintained. The licensee has notified the NRC Resident Inspector.

• * * UPDATE PROVIDED BY JOSH MCGUIRE TO JEFF ROTTON AT 1520 EDT ON 10/17/2014 * * *

An automatic SCRAM occurred at 0251 EDT, moments before operators inserted a manual SCRAM in accordance with station procedures. The licensee notified the NRC Resident Inspector. Notified R1DO (Cook).

On July 7, 2014 at approximately (2040 EDT), an issue was discovered with currently removed Electromatic Relief Valves (EMRVs) that calls the operability of the currently installed EMRVs into question. Based on this new information, all 5 of the currently installed EMRVs were conservatively declared inoperable. With the potential of 5 EMRVs inoperable a Technical Specification shutdown is required under Technical Specification 3.4.b, whereby reactor pressure shall be reduced to 110 psig or less within 24 hours. This event is immediately reportable under: 50.72(b)(2)(i), 'The initiation of any nuclear plant shutdown required by the plant's Technical Specifications.' 50.72(b)(3)(v)(D), 'Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to: (D) Mitigate the consequences of an accident.'" The licensee notified the NRC Resident Inspector. The licensee will notify the State of New Jersey and issue a press release.

• * * RETRACTION AT 1745 EDT ON 7/11/2014 FROM CHARLES SPAGNUOLO TO MARK ABRAMOVITZ * * *

The original concern and July 7, 2014 EN (report) was caused by abnormal wear found on removed Electromatic Relief Valve actuators. However, on July 8, 2014, upon completion of in situ testing as well as visual examination of the installed EMRV actuators, it was determined that the 5 currently installed EMRVs were fully operable and capable of performing their safety function. Therefore, Oyster Creek is retracting the notifications made under 50.72(b)(2)(i) and 50.72(b)(3)(v)(D). The licensee notified the NRC Resident Inspector and the State will be notified. The licensee will be issuing a press release. Notified the R1DO (DeFrancisco).

At 1037 EDT on May 28, 2014 an Unusual Event (EAL HU5) was declared due to a release of toxic gas that could have adversely affected plant operations. The leak was due to a leak in pipe containing water and chlorine. The pipe has been isolated and the leak has stopped. The chlorine smell was initially noticed at approximately 1008 EDT. The leak was coming from a buried underground pipe. There were no personnel injuries or medical response needed. The licensee notified the NRC Resident Inspector, State, and local authorities. The licensee plans on issuing a press release. Notified DHS SWO, FEMA Ops Center, NICC Watch Officer, and Nuclear SSA via email.

• * * UPDATE FROM ROBERT SALES TO CHARLES TEAL AT 1202 EDT ON 5/28/14 * * *

At 1140 EDT on 5/28/14 Oyster Creek has exited the Unusual Event. The leak has been isolated and is not affecting normal plant operations. The licensee notified the NRC Resident Inspector, State, and local authorities. The licensee plans on issuing a press release. Notified R1DO (Rogge), NRR EO (Chernoff), IRD MOC (Gott), DHS ASWO, FEMA Ops Center, NICC Watch Officer, and Nuclear SSA via email.

(The New Jersey Department of Environmental Protection) and Ocean County Health (Department were) notified of a spill of approximately 1 cup of hydraulic fluid (oil) that leaked from a vehicle and entered a storm drain at approximately 1615 (EST). The licensee notified the NRC Resident Inspector.

• * * RETRACTION FROM JEREMY SHARKEY TO CHARLES TEAL AT 1954 EST ON 2/27/14 * * *

Upon subsequent review of the Material Safety Data Sheet associated with the fluid that leaked from the vehicle, it was determined that the fluid was not a hazardous substance as defined by the State of New Jersey (Appendix A of N.J.A.C. 7:1E). Additionally, it was determined that the fluid did not reach surface water. Based on this information, the New Jersey Department of Environmental Protection (NJDEP) was notified that the fluid that leaked from the vehicle did not reach surface water and was not a hazardous substance. The NJDEP notification was updated for the record. For the above reasons, the 4 hour non-emergency ENS notification made under EN # 49850 is hereby retracted The NRC Resident Inspector has been informed. Notified R1DO (DeFrancisco).

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.

• * * UPDATE FROM ERIC SWAIN TO HOWIE CROUCH AT 1245 EDT ON 3/29/13 * * *

The TSC ventilation system was returned to service at 1240 EDT. The licensee has notified the NRC Resident Inspector. Notified R1DO (Krohn).

At 1855 EDT on 10/29/2012, the licensee declared a Notice of Unusual Event (NOUE) per criteria HU4 for high water level in the station intake structure of greater than 4.5 feet. At the time of the notification, water level in the intake structure was approximate 4.8 feet and slowly rising. The cause of the increased water level was due to storm surge associated with Hurricane Sandy. No other station impacts were reported at the time. The licensee continues to monitor the intake levels and ocean tides. The licensee has notified the NRC Resident Inspector and the State of New Jersey.

• * * ALERT UPDATE ON 10/29/2012 AT 2141 EDT FROM STEVE SERPE TO RYAN ALEXANDER * * *

At 2044 EDT on 10/29/2012, the licensee escalated its emergency declaration to an Alert per criteria HA4 for high water level in the station intake structure of greater than 6.0 feet. At the time of the notification, water level in the intake structure was approximately 6.6 feet. The site also experienced a loss of offsite power event concurrent with the additional water level increase. Both emergency diesel generators started and are supplying power to the emergency electrical busses. Shutdown cooling and spent fuel pool cooling have been restored. Reactor pressure vessel level is steady at 584.7 inches. Intake levels continues to rise slowly and the licensee is monitoring. The licensee has notified the NRC Resident Inspector and the State of New Jersey. Notified DHS SWO, FEMA Ops Center, USDA Ops Center, HHS Ops Center, DOE Ops Center, DHS NICC Watch Officer, EPA EOC, and NuclearSSA via e-mail.

• * * UPDATE on 10/30/12 at 0414 EDT FROM GILBERT DEVRIES TO RYAN ALEXANDER * * *

The licensee updated this report with an 8-hour non-emergency notification of emergency diesel generator auto-actuation due to the actual loss of off-site power event (which occurred at 2018 EDT on 10/29/2012). This event caused a valid RPS actuation with automatic containment isolations that resulted in a temporary loss of shut-down cooling to the reactor. Shutdown cooling was subsequently restored with power provided by the emergency diesel generators. The licensee has notified the NRC Resident Inspector. Notified R1DO (Caruso).

• * * UPDATE AT 0357 EDT ON 10/31/12 FROM GILBERT A. DeVRIES TO S. SANDIN * * *

Termination of Alert. The Oyster Creek Station has terminated the Alert that was declared at 2044 (EDT) on 10/29/12 due to Intake Structure high water level greater than 6.0 ft. MSL (EAL HA4). Intake water level has returned to normal and is now below the Unusual Event EAL threshold (4.5 ft. MSL) and continues to lower. The licensee informed state and local agencies and the NRC Resident Inspector. Notified Region I IRC (Clifford), NRR (Evans), and IRD (Marshall). Notified DHS SWO, FEMA Ops Center, USDA Ops Center, HHS Ops Center, DOE Ops Center, DHS NICC Watch Officer, EPA EOC, and NuclearSSA via e-mail.

At 0329 EDT, Oyster Creek experienced a loss of offsite power. As a result of the loss of offsite power, the unit automatically scrammed from 100% with all control rods fully inserting and all safety systems functioning as required. Both Emergency Diesel Generators automatically started and are carrying loads on the safety buses. At 0341 EDT, Oyster Creek declared an Unusual Event based on a loss of offsite power for greater than 15 minutes. The unit is stable in Hot Shutdown with decay heat removal via the Isolation Condenser. The cause of the loss of offsite power is currently under investigation by JCP&L. The licensee notified the State and local agencies, as well as the NRC Resident Inspector. The licensee will be making a press release.

• * * UPDATE ON 7/23/12 AT 0625 EDT FROM ROBERT SALES TO DONG PARK * * *

Oyster Creek has terminated from the loss of offsite power Unusual Event (at 0538 EDT). All safety systems functioned as expected for this event. The licensee has notified the NRC Resident Inspector. Notified R1DO (Dimitriadis), NRR EO (Nieh), IRD (Gott), DHS SWO, FEMA, and DHS NICC.

• * * UPDATE ON 7/23/12 AT 1205 EDT FROM ANDREW ZUCHOWSKI TO VINCE KLCO * * *

As a result of the loss of offsite power, both Emergency Diesel Generators automatically started and carried loads on the safety buses, as required. Offsite power was returned to service at 0457 EDT and both Emergency Diesel Generators were secured at 0520 EDT. Per 50.72(b)(3)(iv)(A), Oyster Creek is reporting any event or condition that results in valid actuation of an Emergency AC electrical power system. Additionally, the Reactor Building (Secondary Containment) differential pressure indicated positive 0.25 inches W.G. at approximately 0357 EDT. Reactor Building differential pressure indication returned to normal at 0434 EDT. Oyster Creek is currently investigating the cause of the positive Reactor Building pressure indication. Per 50.72(b)(3)(v)(C), Oyster Creek is reporting an event that could have prevented the fulfillment of the safety function of a system needed to control the release of radioactive material. The licensee notified the NRC Resident Inspector. Notified R1DO (Gray).

• * * UPDATE AT 0914 EDT ON 9/12/12 FROM ERIC SWAIN TO HUFFMAN * * *

As a result of further investigation it was found that the Reactor Building Differential Pressure issue was an indication issue only and not indicative of a loss of the secondary containment barrier. The positive indication was caused by a degradation of instrument air pressure to the instrument used to generate the differential pressure indication. The degradation of instrument air pressure was an expected condition caused by the loss of offsite power. Alternate indication, not affected by instrument air pressure, was available throughout the event. The alternate indication read negative 0.4 Inches water gauge throughout the event. Based on this information Oyster Creek is retracting the portion of this report that was reported per 50.72(b)(3)(v)(C), an event that could have prevented the fulfillment of the safety function of a system needed to control the release of radioactive material. The licensee has notified the NRC Resident Inspector. R1DO (Newport) notified.

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.

• * * UPDATE FROM JOHN CLARK TO VINCE KLCO AT 1109 EDT ON 3/15/2012 * * *

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)