| . | | | Event date | Site | Region | Event description |
|---|
| ENS 57322 | 16 September 2024 16:40:00 | Brunswick | NRC Region 2 | The following information was provided by the licensee via fax and phone:
On September 16, 2024, at 1240 EDT, with Unit 1 in mode 1 at 100 percent power and Unit 2 in mode 1 at 100 percent power, an Unusual Event was declared due to roads in the area leading to the plant being flooded and having the potential to prohibit plant staff from accessing the site via personal vehicles (Emergency Action Level HU3.4). Current onsite plant staff is sufficient for plant operation.
This event is being reported in accordance with 10 CFR 50.72(a)(1)(i) due to the declaration of an emergency classification as specified in the approved Emergency Plan.
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.
The NRC decided to remain in the Normal mode of operation at 1320 EDT.
Notified DHS SWO, FEMA Ops Center, CISA Central Watch Officer, FEMA NWC (email), DHS Nuclear SSA (email), CWMD Watch Desk (email).
- * * UPDATE ON 9/17/2024 AT 1411 EDT FROM DAVID MACDONALD TO ROBERT THOMPSON * * *
The following information was provided by the licensee via phone and email:
At approximately 1400 EDT on September 17, 2024, the Unusual Event at Brunswick was terminated due to the flood waters receding and roads to the plant becoming passable.
The NRC resident inspector has been notified.
Notified R2DO (Suber), NRR EO (Felts), IR MOC (Crouch), DHS SWO, FEMA Ops Center, CISA Central Watch Officer, FEMA NWC (email), DHS Nuclear SSA (email), CWMD Watch Desk (email). | | ENS 57237 | 24 July 2024 12:02:00 | South Texas | NRC Region 4 | The following information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
A Notification of Unusual Event was declared by South Texas Project Unit 1 at 0718 CDT for emergency action level (EAL) SU.1, loss of all offsite power for greater than 15 minutes, following a fire in the switchyard. Unit 1 tripped following the loss of power and is stable in Mode 3. Unit 2 reduced power to 90 percent but was otherwise unaffected by this event. Offsite services responded to the switchyard fire. The fire was extinguished at 0925 CDT.
There is no radioactive release and no threat to public safety.
The licensee notified state and local authorities and the NRC senior resident inspector.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).
- * * UPDATE ON 7/24/2024 AT 1154 EDT FROM CHRIS VAN FLEET TO ERNEST WEST * * *
The following information was provided by the licensee via phone and email:
At 0702 CDT on 7/24/2024, with Unit 1 in Mode 1 at 100 percent power, the Unit 1 reactor automatically tripped due to loss of offsite power. The trip was not complex, with all systems responding normally post-trip. No equipment was inoperable prior to the event that contributed to the event or adversely impacted plant response to the scram.
Operations responded and stabilized the plant. Decay heat is being removed by steam generator power operated relief valves (PORV). Unit 2 was reduced in power to approximately 90 percent power due to conditions in the switchyard.
Due to the reactor protection system actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
There was no impact on the health and safety of the public or plant personnel. The NRC resident inspector has been notified.
Notified R4DO (Azua)
- * * UPDATE ON 7/24/2024 AT 1259 EDT FROM CHRIS MCRARY TO ERNEST WEST * * *
The following is a summary of information provided by the licensee via phone:
At 1146 CDT, South Texas Project Unit 1 terminated the previously declared Notification of Unusual Event due to restoration of an offsite source of electrical power.
Notified R4DO (Azua), NRR EO (McKenna), IR MOC (Crouch), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).
- * * UPDATE ON 7/24/2024 AT 1555 EDT FROM CHRIS VAN FLEET TO ERNEST WEST * * *
The following information was provided by the licensee via phone and email:
For the 10 CFR 50.72(b)(3)(iv)(A) reporting requirements:
At 0702 CDT on 7/24/2024, with both Unit 1 and 2 in Mode 1 at 100 percent power, the South Texas Project (STP) north and south switchyard electrical buses were de-energized.
In Unit 1, all emergency diesel generators (EDGs) 11, 12, and 13 automatically started in response to loss of offsite power on train `A', `B', and `C' engineered safety feature (ESF) buses.
Also in Unit 1, trains `A', `B', and `C' of the auxiliary feedwater (AFW) system automatically started.
In Unit 2, EDG 22 automatically started in response to loss of offsite power on the train `B' ESF bus.
Also in Unit 2, train `B' of the AFW system automatically started.
This event is reportable under 10 CFR 50.72(b)(3)(iv)(A) as an event that resulted in the valid actuation of a pressurized water reactor auxiliary feedwater system (50.72(b)(3)(iv)(B)(6)) and emergency alternating current (AC) electrical power system (50.72(b)(3)(iv)(B)(8)). There was no impact on the health and safety of the public or plant personnel. The NRC resident inspector has been notified.
For the 10 CFR 50.72(b)(2)(xi) reporting requirement:
A news release was completed at 1140 CDT on 7/24/2024, by South Texas Project on the declaration of the Unusual Event. This media release is being reported in accordance with 10 CFR 50.72(b)(2)(xi): Any event or situation, related to the health and safety of the public or onsite personnel, or protection of the environment, for which a news release is planned or notification to other government agencies has been or will be made.
Notified R4DO (Azua)
- * * UPDATE ON 7/29/2024 AT 1558 EDT FROM MATT DUGGER TO IAN HOWARD * * *
The following information was provided by the licensee via phone and email:
After a review of station logs, it was determined that there was not a loss of all offsite AC power to Unit 1 related to the event that occurred on July 24, 2024. An offsite AC power source was available through the 138 kV transmission line.
The NRC Resident Inspector has been notified.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
At this time the licensee is not retracting the declaration of emergency action level 'SU.1'.
Notified R4DO (Werner) | | ENS 57066 | 4 April 2024 23:18:00 | Palo Verde | NRC Region 4 | The following information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
On 4/4/2024 at 1618 MST, a Notification of Unusual Event, HU4.2 was declared based on an unverified fire alarm in the containment building greater than 15 minutes. Palo Verde, Unit 3 was operating in Mode 1 at 91 percent power due to end of cycle coast down to a refueling outage. There is no known plant damage at this time. Offsite assistance cannot enter the containment building, therefore, offsite assistance was not requested. The plant is stable in Mode 1.
The licensee notified State and local authorities and the NRC Senior Resident Inspector.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).
- * * UPDATE ON 04/04/24 AT 2313 EDT FROM YOLANDA GOOD TO IAN HOWARD * * *
The following information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
At 2013 MST, Palo Verde Unit 3 terminated the notification of unusual event. The basis for termination was that a containment entry was performed. All levels were inspected, and no fires were found. The NRC Resident Inspector has been notified.
Notified R4DO (Deese), IR-MOC (Crouch), NRR-EO (Felts), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email). | | ENS 57042 | 22 March 2024 04:37:00 | Waterford | NRC Region 4 | The following information was provided by the licensee:
A Notification of Unusual Event, HU4.4 (see note below) was declared based a fire in the protected area requiring off site assistance to extinguish. The fire was in the main transformer yard. The fire was detected at 2328 CDT on March 21, 2024, and the fire was declared out at 0009 CDT on at March 22, 2024. An automatic reactor trip was initiated due to a loss of offsite power to the "B" train and a failure to automatically transfer from unit auxiliary transformer "B" to startup transformer "B.
The licensee notified State and local authorities and the NRC Resident Inspector.
The NRC remained in Normal.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).
NOTE: Due to a typographical error initiating condition HU4.1 was initially recorded for the event. The correct initiating condition is HU4.4 as now shown.
- * * UPDATE AT 0345 EDT ON 03/22/24 FROM LARRY GONSALES TO BILL GOTT * * *
The licensee terminated the Notification of Unusual Event at 0221 CDT on 3/22/24.
The licensee notified the NRC Resident Inspector.
Notified R4DO (Gepford), IR-MOC (Grant), NRR-EO (Felts), DHS-SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).
- * * UPDATE AT 0420EDT ON 03/22/24 FROM JOHN LEWIS TO BILL GOTT * * *
RPS ACTUATION
The following information was provided by the licensee via email:
On March 21, 2024, at 2328 CDT, Waterford 3 Steam Electric Station, Unit 3 was operating at 98 percent power when an automatic reactor trip was initiated due to a loss of offsite power to the B train and a failure to automatically transfer from unit auxiliary transformer B to startup transformer B.
Emergency feedwater actuation signal 2 (EFAS), safety injection actuation signal (ECCS), containment isolation actuation signal and emergency diesel generators automatically actuated. The unit is currently stable in Mode 3. All control rods fully inserted and all other plant equipment functioned as expected. Forced circulation remains with one reactor coolant pump per loop running. Decay heat removal is via the main condenser. A train safety bus is being supplied by off-site power, and B train safety bus is being supplied by emergency diesel generator B.
Following the loss of offsite power to the B train, it was reported that main transformer B and startup transformer B were both on fire. The Emergency Director declared an Unusual Event at time 2337 CDT. The fire was reported extinguished at 0009 CDT on March 22, 2024, and the Unusual Event was terminated at 0221 CDT on March 22, 2024. Offsite assistance was requested. The local fire department responded to the site but the fire was extinguished by the on-shift fire brigade. NRC Region IV management was contacted regarding the emergency plan entry at 0030 CDT on March 22, 2024.
This event is being reported as a 4-hour non-emergency notification in accordance with 10 CFR 50.72(b)(2)(iv)(B) as an actuation of the reactor protection system (RPS) when the reactor is critical and as an 8-hour non-emergency notification in accordance with 10 CFR 50.72(b)(3)(iv)(A) as valid actuation of the EFW system, ECCS, Containment Isolation and Emergency Diesel Generators.
The NRC Resident Inspector has been notified.
Notified R4DO (Gepford)
- * * RETRACTION OF NOTICE OF UNUSUAL EVENT FROM ON 03/26/24 AT 1721 FROM L. BROWN TO K. COTTON * * *
The initial notification in event notice #57042 by Waterford Steam Electric Station, Unit 3, reported a Notice Of Unusual Event (NOUE) emergency declaration due to a fire in the protected area requiring off site support to extinguish. The basis for retraction of the initial emergency notification is that this event did not meet the definition of a fire in the protected area that requires off site support to extinguish. Guidance provided in Nuclear Energy Institute (NEI) 99-01, Rev. 6 and implemented in Waterfords Emergency Plan procedure, initiating Condition HU4.4 states, The dispatch of an offsite firefighting agency to the site requires an emergency declaration only if it is needed to actively support firefighting efforts because the fire is beyond the capability of the Fire Brigade to extinguish. (NOTE: The Initial Notification Form sent from the Control Room at 2341 CDT on March 21, 2024, requested by and provided to the NRC Headquarter Operations Center via e-mail at 0302 CDT on March 22, 2024, stated that the Emergency Classification had been made on Initiating Condition HU4.4 rather than HU4.1)"
When the event occurred on March 21, 2024, the Emergency Director declared an Unusual Event at 2337 CDT and requested offsite support based on the information available at that time including the initial assessment by the fire brigade leader and expected need for offsite support to extinguish the fire. As reported in the 0420 EDT update on March 22, 2024, the fire was reported extinguished at 0009 CDT on March 22, 2024, by the Waterford Fire Brigade without the need of offsite support."
Notified R4DO (Kellar).
- * * UPDATE AT 1209 EDT ON 03/27/24 FROM JOHN LEWIS TO KAREN COTTON * * *
The initial notification in EN 57042 by Waterford Steam Electric Station, Unit 3, reported an emergency declaration of an Unusual Event due to a fire in the protected area requiring off site support to extinguish. The basis for the update to the initial notification is that this event did not meet the definition of a Fire in the Protected Area that requires offsite support to extinguish. As provided in NEI 99-01, Rev. 6 and implemented in Waterfords emergency plan procedure, initiating condition HU4.4 states, The dispatch of an offsite firefighting agency to the site requires an emergency declaration only if it is needed to actively support firefighting efforts because the fire is beyond the capability of the Fire Brigade to extinguish. Additionally, EAL 4.1 for a fire not extinguished within 15 minutes of detection in any Table H-1 fire area was not applicable because the fire did not occur in a Table H-1 fire area.
When the event occurred on March 21, 2024, the Emergency Director declared an Unusual Event at 2337 CDT and requested offsite support based on the information available at that time including the initial assessment by the fire brigade leader and expected need for offsite support to extinguish the fire. As reported in the 0420 EDT update on March 22, 2024, the fire was reported extinguished at 0009 CDT on March 22, 2024, by the Waterford Fire Brigade without the need of offsite support.
(NOTE: The Initial Notification Form sent from the Control Room at 2341 CDT on March 21, 2024, requested by and provided to the Headquarters Operation Center via e-mail at 0302 CDT on March 22, 2024, stated that the emergency classification had been made on initiating condition HU4.4 rather than HU4.1)
In accordance with NRC Approved guidance in FAQ 21-02 (ML21117A104), Waterford 3 is retracting the initial event notification made at 0117 EDT on March 22, 2024. The remaining events that were reported in EN 57042 as a 4-hour non-emergency notification in accordance with 10 CFR 50.72(b)(2)(iv)(B) as an actuation of the reactor protection system (RPS) when the reactor is critical and as an 8-hour non-emergency notification in accordance with 10 CFR 50.72(b)(3)(iv)(A) as valid actuation of the EFW (emergency feedwater) system, ECCS (emergency core cooling system), containment isolation and emergency diesel generators are still applicable and require no additional update at this time.
The licensee also provided a site map.
Notified R4DO (Kellar) | | ENS 56809 | 21 October 2023 13:07:00 | Watts Bar | NRC Region 2 | The following information was provided by the licensee via fax and email:
Fire potentially degrading the level of safety of the plant.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
At 0907 EST, the licensee declared a notification of unusual event, under emergency action level HU.4, due to multiple fire alarms and CO2 discharge in the emergency diesel building. When the plant fire brigade entered the building, there was no indication of fire or damage to any plant equipment. The cause of the multiple alarms is under investigation.
State and local authorities were notified and no offsite assistance was requested. Both units remain at 100 percent power.
The NRC Resident Inspector has been notified.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).
- * * UPDATE FROM TYSON JONES TO KAREN COTTON AT 1007 EDT ON 10/21/23 * * *
At 1007 EDT, Watts Bar terminated the notification of unusual event. The basis for termination was that no fire or damaged plant equipment was found. The NRC Resident Inspector has been notified.
Notified R2DO (Miller), IR-MOC (Crouch), NRR-EO (Felts), DHS-SWO, FEMA Ops Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).
- * * RETRACTION ON 10/22/23 AT 0925 EDT FROM TYSON JONES TO KAREN COTTON * * *
Watts Bar Nuclear Plant (WBN) is retracting Event Notice 56809, Notice of Unusual Event, based on the following additional information, not available at the time of the initial notification.
Specifically, in accordance with the emergency preparedness implementing procedures, WBN reported a condition that was determined to meet emergency action level (EAL) HU4, Initiating criteria number 1, receipt of multiple (more than 1) fire alarms or indicators and the fire was within any Table H2 plant area, which includes the diesel generator building. It was further determined that multiple fire detection zones actuated (spurious and invalid) enabling the discharge of installed fire suppression (CO2) into the space. Upon entry by the site fire brigade, it was determined that no smoke or fire existed and reported to the Shift Manager at 0930 EDT. All fire alarms were reset. Troubleshooting activities are in progress to determine the cause. A fire watch has been established and CO2 has been isolated. The required compensatory measures for the affected areas will remain in place until completion of the investigation, and CO2 suppression is restored to functional.
Notified R2DO (Miller), IR-MOC (Crouch), NRR-EO (Felts), DHS-SWO (email), FEMA Ops Center (email), CISA Central (email), FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email). | | ENS 56264 | 8 December 2022 19:02:00 | Turkey Point | NRC Region 2 | At 1402 EST Turkey Point Unit 3, while operating at 100 percent, declared an Unusual Event due to unidentified leakage greater than 10 gallons per minute for more than 15 minutes. The abnormal procedure for Reactor Coolant System leakage was entered. The plant remains at 100 percent power. The cause of the leakage is under investigation.
At 1446 EST it was verified that the leak had been isolated. The plant remains at 100 percent power.
Unit 4 was unaffected.
State and local authorities were notified by the licensee.
The NRC Resident Inspector has been notified.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS NRCC THD Dest (email), and DHS Nuclear SSA (email).
- * * UPDATE ON 12/08/22 AT 1621 (EST) FROM SZEMEI CHOI TO THOMAS HERRITY * * *
Turkey Point Unit 3 has isolated the leak. The Unusual Event was terminated at 1558 EST.
The NRC Resident Inspector has been notified.
Notified R2DO (Miller), NRR EO (Miller), and IR MOC (Crouch). Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS NRCC THD Dest (email), and DHS Nuclear SSA (email).
- * * RETRACTION FROM BRANDEN NATHE TO DONALD NORWOOD AT 1446 EST ON 1/9/2023 * * *
Turkey Point Nuclear Unit 3 is retracting this notification based on the following additional information not available at the time of the notification, Following the event for unidentified RCS leakage on 12/8/22 at 1403 EST, additional information demonstrated that an RCS leak did not exist.
A review of indications showed that the in-service seal water return filter D/P (Differential Pressure) rose from 1 psid to 6 psid with a corresponding rise in VCT (Volume Control Tank) level as would be seen with an increase in excess letdown flowrate. Additionally, the on-contact radiation dose rate from the excess letdown piping in the U3 Pipe and Valve Room was measured by RP (Radiation Personnel) to be significantly higher than normal with no other sources of elevated radiation levels noted.
Following the closure of CV-3-387, RCS To Excess Letdown HX (Heat Exchanger) Control Valve, a nominal input/output flow balance was able to be restored. Containment parameters including pressure, temperature, sump level and radiation level did not change during the event. Due to the shared nature of piping between excess letdown and seal water return, a challenge to system integrity would not allow RCP (Reactor Coolant Pump) controlled bleed-off to remain in service with a normal flow balance which it has at all times subsequent to the event.
Turkey Point Nuclear reported initially based on the available information at the time and to ensure timeliness with emergency declaration and reporting notification requirements. The NRC Resident Inspector has been notified.
Notified R2DO (Miller). | | ENS 56088 | 4 September 2022 23:39:00 | North Anna | NRC Region 2 | At 1939 EDT, the North Anna Power Station Units 1/2 declared a Notice of Unusual Event (NOUE) under emergency declaration HU1.1 confirmed security event. Both units were unaffected by the event. The licensee exited the NOUE at 2036 EDT. | | ENS 55866 | 29 April 2022 03:55:00 | Sequoyah | NRC Region 2 | The following is a summary of information provided by the licensee via telephone:
On 04/28/22, at 2355 EDT, with both Sequoyah Unit 1 and 2 in Mode-1, 100 percent, a Notice of Unusual Event was declared due to receiving two seismic alarms and security feeling ground movement. Additionally, security in a tower heard an explosion. Both units remain in Mode-1, 100 percent and they are investigating the validity of the seismic alarms before proceeding with the Abnormal Operating Procedure required shutdown.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The licensee will notify the NRC Resident Inspector. The state of Tennessee and the Tennessee Valley Authority were notified.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS NRCC THD Desk(email), and DHS Nuclear SSA (email).
- * * UPDATE ON 04/29/2022 AT 0410 EDT FROM BRIAN KLEIN TO OSSY FONT * * *
The following is a summary of information provided by the licensee via telephone:
On 4/29/22, at 0406 EDT, Sequoyah Unit 1 and Unit 2 terminated the Notice of Unusual Event. The Civil Engineers determined that the alarms were due to a failed seismic indicator channel. Through interviews, only one security officer felt ground movement for a couple of seconds and heard a faint rumbling sound.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The licensee will notify the NRC Resident Inspector. The state of Tennessee and the Tennessee Valley Authority were notified.
Notified R2DO (Miller), NRR EO (Miller), and IR MOC (Gott) via email.
Additionally, notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS NRCC THD Desk(email), and DHS Nuclear SSA (email).
- * * RETRACTION ON 05/02/2022 AT 2118 EDT FROM SCOTT SEAL TO LLOYD DESOTELL * * *
The following information was provided by the licensee via email:
SQN (Sequoyah Nuclear Plant) is retracting the previous NOUE (Notice of Unusual Event) declaration made on 4/28/22 at 2355 (EDT) based on Emergency Action Level HU2 for a seismic event greater than Operating Basis Earthquake levels. Following the declaration of the NOUE, the station reviewed all available indications and determined that a seismic event had not occurred. The instrumentation failure was documented under Event Notification #55867.
Notified R2DO (Miller), and IR MOC (Gott), NRR EO (Miller) via email. | | ENS 55818 | 2 April 2022 18:45:00 | Browns Ferry | NRC Region 2 | The following information was provided by the licensee via fax:
At 1345 CDT, Browns Ferry declared a Notification of Unusual Event due to a fire at the 3B Reactor Feedwater Pump within the Turbine Building which was not extinguished within 15 minutes. Subsequently, the fire was extinguished at 1402 CDT. Unit 3 remains in Mode 1 at approximately 9.5 percent rated thermal power (RTP). Unit 1 and 2 remain at 100 percent RTP and unaffected.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The fire began at 1332 CDT. It is believed that the fire was in the oil system of the Feedwater Pump. The fire was extinguished by the on-site fire brigade. No off-site assistance was requested. The Unusual Event was declared under Emergency Action Level HU-4. The licensee notified the NRC Resident Inspector and required State and local government agencies. Unit 3 is currently stable.
Notified DHS-SWO, FEMA Ops Center, and CISA Central Watch Officer, and FEMA NWC, DHS NRCC THD Desk, and DHS NuclearSSA via email.
- * * UPDATE FROM CHASE HENSLEY TO DONALD NORWOOD AT 1650 EDT ON 4/2/2022 * * *
The Notification of Unusual Event was exited at 1544 CDT.
Notified R2DO (Miller), IR-MOC (Kennedy), NRR-EO (Felts), DHS-SWO, FEMA Ops Center, and CISA Central Watch Officer. | | ENS 55733 | 5 February 2022 08:57:00 | Oconee | NRC Region 2 | The following information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
At 0357 EST on 2/5/22, Oconee Unit 2 declared an Unusual Event due to a multiple fire alarms and visual observance of a smoke filled room in the West Penetration Room (EAL HU 4.1). Unit 2 automatically tripped and entered Mode 3. There was an indication that a release to the environment potentially occurred. Units 1 and 3 remained at 100% power.
The Licensee notified the NRC Resident Inspector, the State, and local authorities.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), and DHS Nuclear SSA (email).
- * * UPDATE ON 2/5/22 AT 0748 EST FROM CHUCK CLEMONS TO LLOYD DESOTELL * * *
The following information was provided by the licensee via email:
At 0343 EST on February 5th, 2022, with Unit 2 in Mode 1 at 100% power, the reactor automatically tripped due to Reactor Coolant Pump (RCP) Flux/Flow Imbalance caused by the simultaneous trip of all 4 RCPs. The cause of the loss of all RCPs is under investigation. The trip was not complex. There was no inoperable equipment prior to the event that contributed to it.
Operations responded and stabilized the plant. Decay heat is being removed by the Reactor Coolant System (RCS) in natural circulation with normal feedwater flow.
Due to the Reactor Protection System (RPS) actuation while critical, this event is being reported as a four hour, nonemergency notification per 10 CFR 50.72(b)(2)(iv)(B).
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The Licensee notified the State and local authorities.
Notified R2DO (Miller)
- * * UPDATE ON 2/5/22 AT 0815 EST FROM CHUCK CLEMONS TO LLOYD DESOTELL * * *
The following information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
At 0811 EST on 2/5/22, Oconee Unit 2 terminated the notification of unusual event because EAL HU 4.1 criteria were no longer met. Unit 2 remains shutdown in Mode 3.
The licensee has notified the State and local authorities and will notify the NRC Resident Inspector.
Notified R2DO (Miller), IRD MOC (Gott), NRR EO (Regan), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 2/7/22 AT 2342 EST FROM PATRICK GADSBY TO OSSY FONT * * *
The following information was provided by the licensee via email:
The follow-up investigation determine that the cause of the trip was determined to be a failed fuse in an undervoltage monitoring circuit for the electrical bus powering the reactor coolant pumps. The trip of the reactor coolant pumps resulted in an automatic reactor trip as designed. The plant responded as expected. There was no fire. The response of the main feedwater system caused an expected increase in temperature in a standby portion of the system which caused the breakdown of the pipe coating producing smoke. There was no release to the environment. The reading of a single instrument was determined to be invalid and other indications supported the conclusion that no release occurred.
The following information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The Licensee notified the NRC Resident Inspector, State and local authorities. A media release was issued on 2/5/22.
Notified R2DO (Miller), IRD MOC (Gott), NRR EO (Regan). | | ENS 55691 | 6 January 2022 15:44:00 | Cook | NRC Region 3 | The following information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
On 01/06/22 at 1044 (EST), an Unusual Event was declared due to a Fire Detection Actuation in the Unit 1, auxiliary cable vault (EAL H.U 4.1). No fire was detected. Unit 1 and Unit 2 remain at 100 percent power.
The Llcensee notified the NRC Resident Inspector, the state, and local authorities.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), and DHS Nuclear SSA (email).
- * * UPDATE FROM DAN WALTER TO TOM KENDZIA AT 1452 (EST) ON 01/06/2022 * * *
At 1441 (EST), DC Cook Unit 1 terminated their notification of unusual event. The basis for termination was that the inspection identified no damage to cables or cable trays. The fire protection system is out of service for the auxiliary cable vault with compensatory measures in effect.
The licensee has notified the state and local authorities and will notify the NRC Resident Inspector.
Notified R3DO (Skokowski), IRD MOC (Grant), NRR EO (Felts), IR (Kennedy)(email), NRR (Veil)(email), R3 DRA (Shuaibi)(email), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 55527 | 16 October 2021 10:28:00 | Dresden | NRC Region 3 | (An) Unusual Event (was declared) due to a fire in the protected area not extinguished in less than 60 minutes.
Main power transformer 3 faulted, the unit auto scrammed, all rods are in. The fire went out at 0622 CDT. (The licensee) is monitoring for re-flash.
The unit automatically scrammed and all rods fully inserted. Decay heat removal is through the condenser. Unit 2 is unaffected and remains at 100 percent power.
The licensee notified the NRC Resident Inspector and R3 Branch Chief (Riemer).
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), and DHS Nuclear SSA (email).
- * * UPDATE ON 10/16/21 AT 0848 EDT FROM DAVID KIJOWSKI TO BETHANY CECERE * * *
The Unusual Event was terminated at 0709 CDT.
Notified R3DO (Pelke), NRR EO (Felts), IR MOC (Kennedy), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), and DHS Nuclear SSA (email). | | ENS 55435 | 29 August 2021 23:12:00 | Waterford | NRC Region 4 | Waterford 3 shut down the reactor in preparation for Hurricane Ida landfall prior to this event.
At 1812 CDT, Waterford 3 declared a notification of unusual event under EAL S.U. 1.1 due to a loss of offsite power as a result of hurricane Ida. Plant power is being provided via emergency diesel generators. The NRC Activated at 2016 EDT with Region IV in the lead.
Notified DHS SWO, DOE Ops Center, FEMA Ops Center, HHS Ops Center, CISA Central, USDA Ops Center, EPA Emergency Ops Center, DHS Nuclear SSA (email), FEMA NWC (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 9/1/21 AT 0132 EDT FROM ALEX SANDOVAL TO BRIAN P. SMITH * * *
At 2345 CDT on 8/31/21, Waterford 3 terminated their notification of unusual event under EAL S.U. 1.1. Offsite power has been restored to both safety-related electrical buses. The NRC remains Activated with Region IV in the lead while reviewing additional criteria to exit Activation.
Notified DHS SWO, DOE Ops Center, FEMA Ops Center, HHS Ops Center, CISA Central, USDA Ops Center, EPA Emergency Ops Center, DHS Nuclear SSA (email), FEMA NWC (email), and FEMA NRCC SASC (email), R4DO (Josey), IR MOC (Kennedy), NRR EO (Miller), R4 (Lantz). | | ENS 55413 | 18 August 2021 04:24:00 | Beaver Valley | NRC Region 1 | At 0024 EDT on 8/18/21, an unusual event was declared (EAL HU 4.1) due to receipt of multiple fire alarms and halon discharge in the cable tunnel. At 0036, the fire brigade verified no signs of fire. Unit 1 remained at 100 percent power and stable.
The area is currently being ventilated. Unit 2 was not affected by this event.
The licensee has notified State and local authorities and the NRC Resident Inspector.
R1 Public Affairs (Screnci) was notified.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE FROM ROBERT KLINDWORTH TO HOWIE CROUCH AT 0414 EDT ON 8/18/21 * * *
At 0401 EDT, Beaver Valley terminated their notification of unusual event. The basis for termination was that there was no indication of fire.
The licensee will be notifying the NRC Resident Inspector and has notified State and local authorities.
Notified R1DO (Jackson), IRD MOC (Gott), NRR EO (Felts), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 55261 | 17 May 2021 16:38:00 | Peach Bottom | NRC Region 1 | (Peach Bottom Atomic Power Station declared an unusual event due to a) "receipt of a single fire alarm in the Unit 2 drywell and the existence of the fire not verified in less than 30 minutes of alarm receipt."
The NRC Resident Inspector and State and Local Authorities were notified.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 5/17/21 AT 1423 EDT FROM BRETT HENRY TO HOWIE CROUCH * * *
At 1355 EDT, the licensee terminated the notification of unusual event. The basis for termination was that the smoke has dissipated and there were no signs of fire.
The licensee notified State and Local Authorities and the NRC Resident Inspector.
Notified R1DO (Grieves), NRR EO (Miller), and IRD MOC (Grant). Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), FEMA NRCC THD (email) and FEMA NRCC SASC (email).
- * * RETRACTION ON 6/8/2021 AT 1249 EDT FROM JAMES BROWN TO DONALD NORWOOD * * *
Peach Bottom Atomic Power Station is retracting notification EN 55261, 'Peach Bottom - Unusual Event,' based on the following additional information not available at the time of the notification:
Following a Unit 2 drywell inspection, analysis of temperature data, and evaluation of equipment in operation; it was concluded that a fire did not exist.
The smoke's most likely apparent cause was the result of heating residual oil/grease in the drywell.
Peach Bottom reported the condition and entry into the UE initially based on the available information at the time and to ensure timeliness with emergency declaration and reporting notification requirements.
The licensee has notified the NRC Resident Inspector.
Notified R1DO (Ferdas). | | ENS 55153 | 25 March 2021 01:29:00 | Turkey Point | NRC Region 2 | An Unusual Event was declared at Turkey Point Unit 4 Nuclear Generating Station at 2129 EDT on 03/24/2021 due to a Fire Alarm in Containment. The licensee was not able to validate the alarm within 15 minutes. Following containment entry there was not smoke or fire present.
At 2214 EDT, Turkey Point Unit 4 Nuclear Generating Station terminated the Unusual Event.
The cause of the spurious fire alarm is under investigation.
The licensee notified the NRC Resident Inspector.
Notified IRD MOC (Gott), NRR EO (Felts), R2DO (Miller), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 55056 | 7 January 2021 07:24:00 | Grand Gulf | NRC Region 4 | An Unusual Event was declared at Grand Gulf Nuclear Station at 0124 (CST) on 01/07/2021 due to Unidentified Drywell Leakage exceeding 10 GPM for 15 minutes. Unidentified leakage has reduced to less than 0.44 GPM as of 0213 CST on 01/07/2021.
The cause of the increase leakage rate is under investigation.
The licensee notified the NRC Resident Inspector.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 01/07/21 AT 0619 EST FROM LEROY PURDY TO BRIAN LIN * * *
At 0356 CST, Grand Gulf Nuclear Station terminated the Unusual Event following plant parameters returning to normal. The current leakage rate is 0.3 gallons per minute and stable. The NRC Resident Inspector has been notified.
Notified R4DO (Kozal), IRD MOC (Gott), NRR EO (Felts), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 55034 | 14 December 2020 08:36:00 | | NRC Region 0 | At 0336 EST, operators declared an Unusual Event due to elevated radioactivity levels observed at the facility's ventilation stack. The elevated levels were due to a release of Argon-41 gas caused by a failure of the facility's fan system. This failure caused the Argon gas to be released to the ventilation stack into the atmosphere. The reactor was operating at 19.5 MW at the time of the incident and was shutdown when the ventilation stack set point was reached. Facility personnel secured the offsite gas release and verified no fission product release occurred. The Unusual Event was terminated at 0422 EST. | | ENS 54988 | 8 November 2020 13:29:00 | Millstone | NRC Region 1 | Millstone Units 2 & 3 declared an Unusual Event at 0921 EST after an earthquake was felt onsite. The earthquake monitoring instrumentation did not actuate, and there were no station system actuations. No damage has been detected at this time.
Millstone has initiated their Abnormal Operating Procedure for an earthquake and performing station walkdowns.
The State of Massachusetts has been notified. The Waterford Police and U.S. Coast Guard have contacted the station. The NRC resident has been notified.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 11/09/2020 AT 0715 EST FROM JASON HARRIS TO THOMAS KENDZIA * * *
At 1510 EST on November 8, 2020, Millstone Units 2 & 3 exited the Unusual Event due to the earthquake following plant walkdowns that revealed no damage to plant structures, systems, or components. Station and System walkdowns identified no issues due to the earthquake. Millstone notified the State and local authorities, and the NRC Resident Inspector.
Notified R1DO (DeFrancisco), IRD (Grant), NRR (Nieh), R1RA (Lew), NRR EO (Miller), DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 54938 | 8 October 2020 16:25:00 | Monticello | NRC Region 3 | At 1125 CDT on 10/8/20 Monticello Nuclear Generating Plant declared a Notification of an Unusual Event (NOUE) due to a Security Condition that did not involve a hostile action, due to a helicopter that hovered over the site for approximately 10 minutes.
The unit remained at 100 percent power during the event.
The licensee notified the NRC Resident Inspector, the Minnesota State Duty Officer and the Wright County and Sherburne County Sherriff departments of the event.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 10/8/2020 AT 2013 EDT FROM JEFF OLSON TO JEFFREY WHITED * * *
At 1715 CDT Monticello Nuclear Generating Plant terminated the Notice of Unusual Event (HU1.1), upon confirmation through federal law enforcement and conversation with the aircraft owner that the aircraft in question was performing power line inspections for a different utility and was not a threat to the plant. Monticello determined that this condition did not meet the 1-hour reporting requirements of 10 CFR 73.71.
Notified R3DO (Orlikowski), NRR EO (Miller), and IRD MOC (Gott). Additionally, notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * RETRACTION ON 10/28/20 AT 1436 EDT FROM JACOB BURSKI TO BETHANY CECERE * * *
Monticello Nuclear Generating Plant (MNGP) is retracting this event notification based on subsequent information received that was not available at the time of the original notification. Following review of the additional information collected by the site through an investigation performed with input from local and federal law enforcement, Xcel Energy determined the helicopter did not constitute a credible threat or compromise site safety or security. There was no impact to public health or safety. The NRC Resident Inspector has been notified.
The licensee will notify the State and county.
Notified R3DO (Peterson). | | ENS 54826 | 10 August 2020 17:58:00 | Duane Arnold | NRC Region 3 | At 1258 CDT on August 10, 2020, Duane Arnold Energy Center declared an Unusual Event due to a loss of offsite power due to high winds. The event at the single unit plant resulted in an automatic scram from 82 percent power (Mode-1) to zero percent power (Mode-3). They are headed to Mode-4. There is damage on site, but the Reactor Building is intact. All rods inserted and cooling is being addressed via Reactor Core Isolation Cooling (RCIC) for level control and Safety Relief Valves are removing decay heat to the torus. Both Standby Diesel Generator are running.
The licensee notified the NRC Resident Inspector, the Iowa Department of Emergency Management, and the Linn County and Benton County Emergency Management agencies.
Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 08/10/2020 AT 1554 EDT FROM CURTIS HANSEN TO OSSY FONT * * *
This report is being made under CFR 50.72 (b)(2)(iv)(B) for an automatic reactor scram due to loss of offsite power due to high winds.
In addition, this report is being made under CFR 50.72 (b)(3)(iv)(A) and (B) due to PCIS ((Primary Containment Isolation System)) Groups 1, 2, 3, 4 and 5 (activating) due to loss of offsite power. All isolations went to completion. RCIC injecting for level control.
All rods fully inserted during the scram. The plant electrical line up is both SBDGs (Standby Diesel Generators) are running.
Decay heat is being removed via SRVs (Safety Relief Valves) to the torus.
Progress towards shutdown cooling.
NRC Senior Resident (Inspector) notified at 1448.
Notified R3DO (Pelke). | | ENS 54812 | 4 August 2020 03:12:00 | Brunswick | NRC Region 2 | At 2312 EDT, on August 3, 2020, Brunswick Unit 1 declared an Unusual Event due to a loss of offsite power. The unit was at approximately 20 percent power and was not synced to the grid when the unit automatically scrammed. All control rods fully inserted. Emergency Diesel Generators started and began powering the safety buses. Safety systems actuated as expected.
The Unit also experienced a loss of Fuel Pool Cooling and Cleanup System, but one pump was returned to service.
Unit 2 remains at 100 percent power and is unaffected.
The licensee notified State and local governments, as well as the NRC Resident Inspector.
Notified DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE FROM MARK TURKAL TO DONALD NORWOOD AT 0120 EDT ON 8/4/2020 * * *
At approximately 2302 EDT, a loss of offsite power occurred on Unit 1. This resulted in a Reactor Protection System (RPS) actuation. Per design, emergency diesel generators 1 and 2 properly started and loaded to their respective emergency buses. The Reactor Core Isolation Cooling (RCIC) system was manually started and is being used to control reactor water level. The High Pressure Coolant Injection (HPCI) system was manually started and is being used for pressure control. As previously reported, an Unusual Event was declared at 2312 EDT due to the loss of offsite power. At the time of the event, Unit 1 was in the process of shutting down for maintenance associated with a ground on the main generator.
Due to the RPS actuation while critical, this event is being reported as a four-hour, nonemergency notification per 10 CFR 50.72(b)(2)(iv)(B).
As a result of the reactor trip, reactor water level reached low level 1 (LL1). The LL1 signal causes a Group 2 (i.e., floor and equipment drain isolation valves), Group 6 (i.e., monitoring and sample isolation valves) and Group 8 (i.e., shutdown cooling isolation valves) isolations. The LL1 isolations occurred as designed; the Group 8 valves were closed at the time of the event. Per design, the loss of offsite power also caused a Group 1 (i.e., main steam isolation valve) isolations.
Due to the Emergency Diesel Generator and Primary Containment Isolation System (PCIS) actuations, this event is also being reported as an eight-hour, nonemergency notification in accordance with 10 CFR 50.72(b)(3)(iv)(A).
Unit 2 was not affected. There was no impact to the health and safety of the public or plant personnel. The safety significance of the event is minimal. All safety related systems operated as designed.
Investigation of the cause of the loss of offsite power is in progress.
The licensee notified the NRC Resident Inspector. Notified R2DO (Inverso).
- * * UPDATE ON 8/4/2020 AT 1534 EDT FROM JOSEPH ELKINS TO ANDREW WAUGH * * *
At 1454 EDT on August 4, 2020, the Unusual Event was exited when offsite power was restored to Unit 1.
Per design, when the loss of offsite power to Unit 1 occurred, all four emergency diesel generators (EDGs) started and EDGs 1 and 2 properly suppled emergency buses 1 and 2. Since Unit 2 was not affected by the loss of power, EDGs 3 and 4 ran unloaded.
With restoration of offsite power to Unit 1, EDG 2 has been secured. EDGs 1, 3, and 4 are being secured as required by plant operating procedure.
Notified R2DO (Inverso), NRR EO (Miller), IRD MOC (Grant), DHS SWO, FEMA OC, DHS NICC WO, CISA IOCC (email), DHS SWO (email), FEMA NWC (email), FEMA Ops Center (email), FEMA-NRCC-sasc (email), NRCC THD Desk (email), NuclearSSA (email). ******************************************************************************************************************************** | | ENS 54808 | 31 July 2020 21:00:00 | Saint Lucie | NRC Region 2 | A Hurricane Warning is in effect for St. Lucie County including the plant site. A Hurricane Warning was confirmed with the State Watch Office at 1700 EDT. As a mater of procedure, St. Lucie Nuclear Power Plant entered an Unusual Event classification for the Hurricane Warning. State and local officials have been notified by the licensee.
The NRC Resident Inspector was notified by the licensee.
This report is submitted in accordance with 10 CFR 50.72(a)(1)(i) due to the Notice of Unusual Event and 10 CFR 50.72(b)(2)(xi) due to the Offsite Notification.
Notified DHS SWO, FEMA OC, DHS NICC WO, CISA IOCC (email), DHS SWO (email); FEMA NWC (email), FEMA Ops Center (email), FEMA-NRCC-sasc (email), NRCC THD Desk (email), NuclearSSA (email).
- * * UPDATE ON 8/2/20 AT 1456 EDT FROM LOUIS ENGELKE TO BETHANY CECERE * * *
The Hurricane Warning was downgraded to a Tropical Storm Warning by the National Weather Service for St. Lucie County, including the plant site. At time 1445 EDT, on 08/02/20, St. Lucie Nuclear Plant has terminated from the Unusual Event classification.
There are no changes in plant status for either unit. Both units are stable at 100% power.
The NRC Resident Inspector was notified of this by the licensee. The licensee notified State and County officials of the termination.
Notified R2DO (M. Miller), IRD MOC (Kennedy), NRR EO (C. Miller), DHS SWO, FEMA OC, DHS NICC WO, CISA IOCC (email), DHS SWO (email); FEMA NWC (email), FEMA Ops Center (email), FEMA-NRCC-sasc (email), NRCC THD Desk (email), NuclearSSA (email) | | ENS 54719 | 19 May 2020 23:30:00 | Dow Chemical Company | NRC Region 0 | At approximately 1930 EDT on May 19, 2020, the Dow Chemical Company TRIGA Reactor received notification of an upstream dam break in Sanford, Michigan and the potential to flood the facility. A Notification of Unusual Event was subsequently declared at 1930 EDT.
The reactor was in a shutdown condition at the time of the event and has been due to COVID-19.
The licensee is monitoring the flood situation in the area and licensee personnel have responded to the site. The NRC remains in the normal mode of operations.
Notified DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 5/21/2020 AT 0850 EDT FROM SIAKA YUSUF TO JEFFREY WHITED * * *
At 0850 EDT on May 21, 2020, the Dow Chemical Company TRIGA Reactor Terminated the Notification of Unusual Event. The event was terminated after flood water receded. The flood water receded faster than was expected.
As stated, the reactor was in a shutdown condition at the time of the event. There was no effect on the reactor due to the flood water.
Notified NPR PM (Wertz and Reed), NRR EO (Miller) IR MOC (Grant), DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 54688 | 1 May 2020 16:53:00 | Summer | NRC Region 2 | At approximately 1238 EDT on May 1, 2020, an alarm indicated smoke on a non-safety related electrical switchgear bus in the turbine building. Plant personnel were dispatched to investigate. Smoke and heat were found coming from the bus. At 1253 EDT, a Notification of Unusual Event was declared. At 1308 EDT the fire was declared out and fire watches posted.
Offsite assistance was requested during the event and the Jenkinsville, SC fire department responded to the site. There were no plant personnel injuries or impact to the health and safety of the public.
The cause of this event is unknown at the present time. The electrical bus has been de-energized. The unit is currently in a planned refueling outage.
The licensee notified the NRC Resident Inspector.
Notified DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE FROM GEORGE SHEALY TO DONALD NORWOOD AT 1754 EDT * * *
The Notification of Unusual Event was terminated at 1737 EDT on May 1, 2020. The cause of the event is currently being investigated.
The licensee will notify the NRC Resident Inspector.
Notified R2DO (Miller). NRR EO (Miller), IRD MOC (Grant). Additionally, notified DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 54531 | 19 February 2020 14:57:00 | Watts Bar | NRC Region 2 | EN Revision Imported Date : 2/21/2020
NOTIFICATION OF UNUSUAL EVENT DUE TO FIRE IN CONTROL BUILDING
At 0957 EST on February 19, 2020, a Notification of Unusual Event (NOUE) has been determined to be present at the Watts Bar plant Unit 1 under criteria HU4 for a fire potentially degrading the safety of the plant (fire for more than 15 minutes).
The NRC Senior Resident Inspector has been notified for this event.
Notified DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 02/19/2020 AT 1151 EST FROM ANDREW WALDMANN TO DONALD NORWOOD * * *
The fire was declared extinguished at 1033 EST. The NOUE was terminated at 1126 EST. The investigation into the cause of the fire is in progress.
Notified R2DO (Musser), NRR EO (Miller), and IRD MOC (Kennedy). Additionally, notified DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * RETRACTION ON 2/20/2020 AT 1453 EST FROM MICHAEL BUTHEY TO RICHARD L. SMITH * * *
Watts Bar Nuclear Plant (WBN) is retracting Event Notice 54531 (NOUE notification) based on the following additional information.
WBN reported a condition that was determined to meet the definition of a FIRE in the plant Emergency Preparedness Implementing Procedures (EPIP) based on indications available to the decision-maker at the time the declaration was made. A fire, without observation of flame, is considered present if large quantities of smoke and heat are observed.
Moderate quantities of smoke were observed coming from an electrical cabinet not required to support safe plant operation. Once Fire Brigade personnel were able to access the affected room, no evidence of flame or significant heat was observed. Plant personnel ultimately determined that an overheated electrical component (transformer) resulted in the smoke. As such, the actual conditions did not meet the EPIP definition of a fire.
The NRC Resident Inspector has been notified of this retraction.
Notified R2DO (Musser), NRR EO (Miller), and IRD MOC (Kennedy). | | ENS 54362 | 30 October 2019 04:26:00 | Saint Lucie | NRC Region 2 | On 10/30/19 at 0026 EDT, an Unusual Event (HU3) was declared due to a release of flammable gas to the Unit 1 Pipe Penetration area (Reactor Auxiliary Building). The hydrogen supply valve to the area has been isolated. The area is being ventilated and follow-up air sampling will be performed.
The NRC Resident Inspector has been notified.
Notified DHS SWO, FEMA Ops Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE FROM FRED POLLAK TO DONALD NORWOOD AT 0521 EDT ON 10/30/2019 * * *
The Notice of Unusual Event was terminated at 0454 EDT on 10/30/19. The area has been purged and normal access restored.
The licensee notified the NRC Resident Inspector.
Notified R2DO (McCoy), NRR EO (Miller), and IRD (Grant). Notified DHS SWO, FEMA Ops Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 54340 | 21 October 2019 04:50:00 | Peach Bottom | NRC Region 1 | While Unit 3 was shutting down for 3R22 refueling outage, the mode switch was taken to shutdown position which is a manual scram signal. The manual scram signal was not received from the mode switch. A subsequent manual scram was inserted with the use of the manual scram push buttons. The Unit 3 reactor is shutdown with all rods inserted.
Unit 2 was unaffected by the event and remains in Mode 1 at 100 percent power.
The licensee notified the NRC Resident Inspector, Pennsylvania and Maryland State Agencies, local government. A media press release is planned.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email), FEMA Region 3 Watch Office (email).
- * * UPDATE AT 0316 EDT ON 10/21/19 FROM KEVIN GROMANN TO BETHANY CECERE * * *
Conditions no longer meet an Emergency Actuation Level and will not deteriorate. Unit 3 reactor is shutdown with all control rods fully inserted. The NOUE was terminated at 0230 EDT."
The licensee notified the NRC Resident Inspector, Pennsylvania and Maryland State Agencies, local government.
Notified the R1DO (Jackson), NRR EO (Miller), IRDMOC (Gott), R1RA (Lew via email), NRR (Nieh via email), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email), FEMA Region 3 Watch Office (email). | | ENS 54253 | 1 September 2019 21:17:00 | Saint Lucie | NRC Region 2 | EN Revision Text: NOTIFICATION OF UNUSUAL EVENT DUE TO DECLARATION OF HURRICANE WARNING
A hurricane warning is in effect for St. Lucie County including the plant site. A hurricane warning was confirmed with the State Watch Office at 1717 EDT. As a matter of procedure, St. Lucie Nuclear Power Plant entered an Unusual Event classification for the hurricane warning. State and local officials have been notified by the licensee.
The NRC Resident Inspector was notified of this by the licensee.
This report is submitted in accordance with 10 CFR 50.72(a)(2)(i) due to the Notice of Unusual Event and 10 CFR 50.72(b)(2)(xi) due to the offsite notification.
- * * UPDATE AT 1835 EDT ON 9/3/19 FROM SARAH LOGSDON TO JEFF HERRERA * * *
The Hurricane Warning was downgraded to a Tropical Storm Warning by the National Weather Service for St. Lucie County including the Plant Site. At time 1818 EDT on 9/3/19, St. Lucie Nuclear Power Plant has terminated from the Unusual Event Classification.
There are no changes in plant status for either unit. Both units are stable at 100 percent power.
The NRC Resident Inspector was notified.
Notified the R2DO (Shaeffer), IRDMOC (Kennedy), NRR EO (Walker), R2RA (Dudes via email), NRR (Nieh via email), DHS SWO, FEMA Ops Ctr., DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), FEMA NRCC (email). | | ENS 54167 | 16 July 2019 20:26:00 | Ge - Hitachi | NRC Region 0 | At 1326 PDT, the licensee declared a notification of unusual event under emergency action level HU.1 for an earthquake felt on site. The reactor was not operating at the time of the event. There was no equipment damage or personnel injuries due to this event. The earthquake registered a 4.4 on the Richter scale with the epicenter approximately 9 miles from the facility.
The licensee notified the California Office of Emergency Services.
At 1357 PDT, the licensee terminated the notification of unusual event.
The NRC remained in the normal mode of operations.
Notified DHS SWO, FEMA Operations Center, FEMA NWC (email), DHS NICC and DHS Nuclear SSA (email). | | ENS 54157 | 10 July 2019 21:59:00 | General Electric Hitachi | NRC Region 0 | On July 10, 2019, at 1459 PDT, GE Hitachi (test reactor in Sunol, California) declared an Unusual Event. Two individuals jumped a boundary fence. The individuals exited the area when approached by security. The licensee notified local law enforcement.
There was no offsite release. The licensee terminated the Unusual Event at 1553 PDT on July 10, 2019.
The licensee notified California Environmental Emergency Services and Alameda County law enforcement.
Notified DHS SWO, DHS NICC, FEMA Operations Center, FEMA NWC (email), and NuclearSSA (email). | | ENS 54052 | 7 May 2019 02:04:00 | Brunswick | NRC Region 2 | At 2204 EDT on 5/6/19, a Notification of Unusual Event (NOUE) was declared due to a fire lasting greater than 15 minutes. The fire occurred in the '2B' Heater Drain Pump motor located in the turbine building. The fire was extinguished following initial Emergency Declaration.
There were no releases to the environment.
Unit 1 was unaffected by the event and remains in Mode 1 at 100 percent power.
The licensee notified the NRC Resident Inspector.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 5/7/19 AT 0002 EDT FROM MICHAEL BRADEN TO BETHANY CECERE * * *
The NOUE was terminated as of 2359 EDT on 5/6/19. No off-site resources were required to extinguish the fire. The turbine building is now free of smoke.
The licensee will notify the NRC Resident Inspector, State of North Carolina, Brunswick County, New Hanover County, and the Coast Guard.
Notified R2DO (Heisserer), NRR EO (Miller), and IRD (Gott).
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 53961 | 28 March 2019 18:50:00 | Brunswick | NRC Region 2 | At 1450 EDT on March 28, 2019, the licensee observed that the Unit 1 unidentified Reactor Coolant System (RCS) leakage was greater than 10 gallons per minute (gpm) for greater than or equal to 15 minutes. The licensee declared an Unusual Event in accordance with their EAL SU 5.1. The licensee initiated a unit shutdown in accordance with their procedures and the unit was approximately 58 percent reactor power at 1507 EDT, with unit shutdown in progress. The licensee also received an alarm due to increasing Drywell Pressure at 1.7 pounds drywell pressure.
At 1600 EDT the licensee called with an update. Unit 1 was still in an Unusual Event with the unit at 37 percent power with the shutdown continuing. Drywell Pressure had decreased to 0.8 pounds. At 1603 the licensee scrammed Unit 1.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 3/28/2019 AT 1808 EDT FROM MARK TURKAL TO THOMAS KENDZIA * * *
At 1437 EDT on March 28, 2019, with Unit 1 in Mode 1 at approximately 100 percent power, a Technical Specification-required shutdown was initiated due to indication of a leak in the drywell. Technical Specification Action 3.4.4.A, Unidentified Reactor Coolant System (RCS) leakage increase not within limit, requires RCS leakage to be reduced to within limits within 8 hours.
It is expected that the leakage would not have been reduced to within limits within the required Technical Specification
completion time; therefore, this event is being reported in accordance with 10 CFR 50.72(b)(2)(i).
There was no impact on the health and safety of the public or plant personnel.
The NRC Resident Inspector has been notified.
- * * UPDATE ON 03/29/19 AT 0302 EDT FROM TOM FIENO TO BETHANY CECERE * * *
At 0259 EDT on March 29, 2019, the Unusual Event was terminated because RCS leakage was reduced to less than 10 gallons per minute. The most recent leakage rate measured at 0225 EDT was 3.9 gpm. The source of the leak will be identified when plant conditions allow containment entry. No elevated radiation levels were observed during this event. Drywell pressure is currently 0.0 psig. Unit 1 is in Mode 4.
The licensee notified the NRC Resident Inspector.
Notified R2DO (Bonser), NRR EO (Miller), IRD MOC (Grant), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 53934 | 15 March 2019 10:46:00 | Cooper | NRC Region 4 | EN Revision Text: UNUSUAL EVENT DECLARED DUE TO HIGH RIVER LEVEL
At 0546 CDT, Cooper Nuclear Station declared an Unusual Event due to the Missouri River level reaching 899.05 feet above mean sea level (MSL), which is above the Emergency Action Level (EAL) HU 1.5 elevation of 899 feet above MSL. The river is expected to crest above 901 feet above MSL within the next day, and remain above 899 feet above MSL for the next several days.
Declaration of an Unusual Event is a 1 hour report, and is reportable under 10 CFR 50.72.a.1.1. Actions are in progress in accordance with site flooding procedure, including strategic placement of barriers at building entrances and important facilities. There is no major plant equipment out of service at this time. Personnel access to the site is not presently impeded and emergency evacuation routes remain available.
A press release is planned for this event, which is a four hour report, reportable under 10 CFR 50.72.b.2.11.
If the Missouri River were to reach 901.5 feet above MSL, Cooper would initiate a unit shutdown in accordance with their procedures. If the Missouri River were to rise greater than 902 feet above MSL, Cooper will declare an Alert.
The licensee notified the NRC Resident Inspector.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE AT 1742 EDT ON 3/24/2019 FROM KLINTON BEHRENDS AND CURTIS MARTIN TO JEFFREY WHITED * * *
The licensee terminated the Unusual Event at 1601 CDT due to lowering Missouri River water levels. River water level is currently at 896.0 feet MSL and lowering.
A press release will be issued to inform the public of Cooper Nuclear Station's exit from the Notification of Unusual Event regarding high Missouri River level. The initial entry into the Notification of Unusual Event occurred on 03/15/2019 and was exited on 03/24/2019 at 1601 CDT. The press release is reportable per 10 CFR 50.72(b)(2)(xi).
The licensee notified the NRC Resident Inspector.
Notified R4DO (O'Keefe), NRR EO (Miller), IRD MOC (Gott), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 53922 | 10 March 2019 05:12:00 | Browns Ferry | NRC Region 2 | At 0012 EST on 3/10/2019, Browns Ferry Unit-3 declared an Unusual Event due to a spurious trip of the generator breaker, resulting in a loss of AC power to the 4 kV shutdown boards greater than 15 minutes. All diesel generators started and loaded to supply onsite power. The reactor auto-scrammed, with all rods fully inserting. The Main Steam Isolation Valves opened and shutdown cooling was being conducted via the condenser. The licensee will exit the emergency declaration once offsite power is restored. There is no estimated restart date.
Browns Ferry Unit 1 remains in Mode-1 (100%), Unit 2 remains in Mode-5 for a refueling outage.
The NRC Resident Inspector has been notified.
This event is related to EN 53923.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 3/10/19 AT 1419 EDT FROM JOHN HOLLIDAY TO BETHANY CECERE * * *
At 1310 CDT, Browns Ferry Unit-3 exited the Unusual Event when 161 kV lines were made available. The licensee is executing procedures for securing the diesel generators while alternate offsite power methods are utilized. Switchyard damage evaluation is in progress.
The licensee will notify the NRC Resident Inspector.
Notified R2DO (Desai), R2RA (Haney), DNRR (Nieh), NRR EO (Miller), and IRD (Grant).
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 53909 | 3 March 2019 14:16:00 | North Anna | NRC Region 2 | At 0916 EST on March 3, 2019, North Anna Unit 2 declared a Notice of Unusual Event under Emergency Action Level HU 2.1 (fire in/or restricting access to any table H-1 area not extinguished within 15 minutes of control room notification or verification of a control room alarm). At 0906 the control room received a heat sensor alarm for the Unit 2, Reactor Coolant Pump motor cube. The fire brigade was dispatched to the scene where they found no indication of fire, no smoke and no fire damage. There were no actuations associated with the alarm and no redundant indications of fire. There was no effect on plant equipment and no indications of RCS leaks. The site determined that the alarm was invalid and terminated the NOUE. Unit 2 is in a stable condition and in a normal electrical lineup. Offsite support was not requested.
The NRC Resident Inspector, State, and local authorities have been notified by the licensee.
Notified R2RA (Haney), DNRR (Evans), IRD MOC (Grant), R4RDO (Rose), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 53809 | 29 December 2018 06:00:00 | Cooper | NRC Region 4 | At 0904 CST, on December 29, 2018, Cooper declared a Notice of Unusual Event under emergency action level HU 3.1. The emergency declaration was due to a toxic gas asphyxiant as a result of a fire. The fire is contained and the fire brigade continues to extinguishing the fire. Offsite support has not been requested.
The licensee notified the NRC Resident Inspector. Additionally, State and Local government agencies were also notified.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 12/29/2018 AT 1655 EST FROM JIM FLORENCE TO JEFFREY WHITED * * *
At 1544 CST, on December 29, 2018, Cooper terminated the Notice of Unusual Event under emergency action level HU 3.1. The fire was verified to be extinguished and the flammable material was removed. The plant remained at 100% power for the duration of the event.
The licensee issued a press release regarding the event at 1202 CST, on December 29, 2018.
The license notified the NRC Resident Inspector.
Notified R4DO (Taylor), NRR EO (Groom), IRD MOC (Gott), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 53754 | 26 November 2018 05:00:00 | Sequoyah | NRC Region 2 | At 0816 EST, a Notification of Unusual Event was declared for Unit 2 under Emergency Action Level H.U.4 for excessive smoke in the lower level of containment with a heat signal. Onsite fire brigade is responding to the event. A command post is established. Offsite support is requested by the fire brigade. No flames have been observed as of this report.
The NRC Resident Inspector and State and Local government agencies will be notified.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 11/26/18 AT 1036 EST FROM BILL HARRIS TO JEFFREY WHITED * * *
At 1036 EST, Sequoyah Nuclear Station Unit 2 terminated the Notice of Unusual Event. The licensee determined that the source of the smoke in containment was oil on the pressurizer beneath the insulation, that heated up during plant heatup. The licensee did not see visible flame during the event. The licensee is still working to determine if there was any damage to the pressurizer.
The licensee will notify the NRC Resident Inspector.
Notified R2DO (Rose), R2RA (Haney), NRR (Nieh), IRD MOC (Gott), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 11/26/18 AT 1337 EST FROM STEPHEN FRIESE TO KARL DIEDERICH * * *
Following declaration of the Notification of Unusual Event, TVA media relations communicated with the local media regarding the event.
The licensee has notified the NRC Resident Inspector.
Notified R2DO (Rose).
- * * UPDATE ON 11/26/18 AT 1551 EST FROM STEPHEN FRIESE TO DONG PARK * * *
At 1036 EDT, Sequoyah Nuclear Plant (SQN) terminated the Notification Of Unusual Event (NOUE) due to initial report of heat and smoke in Unit 2 Lower Containment.
At 1000 EDT, it was determined that no fire had occurred. Due to difficulty of access to some of the areas being searched, the source could not be identified prior to 1000 EDT. No visible flame (heat or light) was observed.
The source of the smoke was determined to be residual oil from a hydraulic tool oil in contact with pressurizer piping. The pressurizer piping was being heated up to support Unit 2 start-up following U2R22 refueling outage. Once the residual oil dissipated, the smoke stopped. It has been concluded that no fire or emergency condition existed.
Unit 2 is currently in Mode 5, maintaining reactor coolant temperature 160F-170F and pressure 325psig-350psig with 2A Residual Heat Removal (RHR) system in service in accordance with U2R22 refueling outage plan.
The licensee has notified the NRC Resident Inspector.
Notified R2DO (Rose).
- * * RETRACTION ON 11/29/2018 AT 1358 EST FROM FRANCIS DECAMBRA TO ANDREW WAUGH * * *
Sequoyah Nuclear Plant (SQN) is retracting this notification based on the following additional information not available at the time of the notification:
Following a full Reactor Building inspection, it was concluded that a fire did not exist. The source of the smoke originally reported was later determined to be residual oil from a hydraulic tool in contact with pressurizer piping. Once the residual oil dissipated, the smoke stopped. The source of heat originally reported was normal heated conditions associated with the pressurizer commensurate with plant conditions. SQN reported initially based on the available information at the time and to ensure timeliness with emergency declaration and reporting notification requirements.
The licensee has notified the NRC Resident Inspector.
Notified R2DO (Shaeffer). | | ENS 53609 | 15 September 2018 04:00:00 | Brunswick | NRC Region 2 | EN Revision Text: UNUSUAL EVENT DUE TO SITE CONDITIONS PREVENTING PLANT ACCESS
A hazardous event has resulted in on site conditions sufficient to prohibit the plant staff from accessing the site via personal vehicles due to flooding of local roads by Tropical Storm Florence.
Notified DHS SWO, FEMA OPS, and DHS NICC. Notified FEMA NWC, NuclearSSA, and FEMA NRCC via email.
- * * UPDATE FROM BRUCE HARTSCOK TO VINCE KLCO ON 9/28/2018 AT 1414 EDT * * *
On 9/18/2018 at 1400 EDT, the Unusual Event at Brunswick was terminated due to the ability to transport personnel to the site.
The licensee will notify the NRC Resident Inspectors.
Notified the R2DO (Guthrie), NRR EO (Miller) and the IRD MOC (Grant).
Notified DHS SWO, FEMA OPS, and DHS NICC. Notified FEMA NWC, NuclearSSA, and FEMA NRCC via email. | | ENS 53558 | 22 August 2018 05:00:00 | Browns Ferry | NRC Region 2 | On 08/22/2018 at 1803 hours CDT, Browns Ferry Nuclear Plant declared an Unusual Event per EAL HU4, a fire potentially degrading the level of safety of the plant.
At 1748 CDT Unit 1 received a call reporting smoke coming from the 480V Condensate Demineralizer Panel 3 in the Unit 3 turbine building elevation 557'. At approximately 1803 (CDT), the incident commander on the scene confirmed a fire inside the panel and all three units entered 0-AOI-26-1, Fire Response. The board was subsequently de-energized by operations personnel and the fire was extinguished at 1806 CDT. SM (Shift Manager) exited EAL HU4 and all three units exited 0-AOI-26-1 at 1840 CDT.
Fire operations remain on scene to monitor. A team is being assembled for damage assessment and recovery.
The fire did not affect any safety systems, no plant transients resulted, and no injuries were reported.
This event is reportable within 1 hour IAW 10 CFR 50.72(a)(1)(i).
The NRC Resident inspector has been notified.
Notified DHS SWO, FEMA Ops, DHS NICC, FEMA NWC (email) and NuclearSSA (email). | | ENS 53520 | 21 July 2018 05:00:00 | Kansas State University | NRC Region 0 | The licensee declared an Unusual Event on 7/21/2018 at 2000 CDT due to a detected gas leak near a campus dormitory. The reactor was not impacted. Local authorities and the gas company are on location in order to identify and repair the source of the gas leak. The Kansas State University non-power reactor is in a safe shutdown condition.
- * * UPDATE FROM ALLEN CEBULA TO OSSY FONT ON 7/22/2018 AT 0051 EDT * * *
The Unusual Event was terminated on July 21, 2018 at 2348 CDT. The source of the gas leak was identified and isolated.
Notified NRR (Evans), NRR PM (Traiforos), NRR (Reed), IRD (Grant), DHS SWO, DHS NICC, FEMA OPS AND FEMA NATIONAL WATCH CENTER, FEMA NRCC SASC AND NUCLEAR SSA via email. | | ENS 53462 | 20 June 2018 05:00:00 | Browns Ferry | NRC Region 2 | On June 20, 2018 at 1003 CDT, the licensee declared a Notification of Unusual Event based on Emergency Action Level (EAL) 6.5.U, toxic gas release on site.
The Notification of Unusual Event was terminated at 1025 CDT.
The toxic gas release occurred when site personnel were filling a fire suppression carbon dioxide (CO2) tank outside the diesel generator building. The relief valve in the common diesel generator room for Unit 1 and 2 diesel generators inadvertently lifted causing a toxic gas environment by releasing CO2 into the room. The licensee terminated the tank fill stopping the release of CO2, and with the door to the room being opened, the gas cleared in about 20 minutes.
The licensee has notified the NRC Resident Inspector.
Notified DHS SWO, FEMA Ops, DHS NICC, FEMA NWC (email) and NuclearSSA (email). | | ENS 53396 | 10 May 2018 20:17:00 | Oconee | NRC Region 2 | Unit 3 experienced a loss of AC power while in Mode 6. Power was regained automatically from Keowee via the underground path.
Decay heat removal has been restored. Spent fuel cooling has been restored.
Emergency procedures (are) in progress.
The Licensee notified the senior NRC resident inspector, State of South Carolina and local authorities.
The total loss of 4160 volt AC power was for approximately 30 seconds. The unit is refueled and reactor reassembly complete up to bolting on the reactor head. There was no effect on Units 1 and 2.
Notified DHS SWO, FEMA Ops Center, FEMA NWC, DHS NICC, and NuclearSSA
- * * UPDATE FROM SCOTT HAWKESWORTH TO HOWIE CROUCH AT 0554 EDT ON 5/11/18 * * *
At 0530 EDT, Oconee terminated the notification of unusual event on Unit 3. The basis for termination was that offsite power was restored and the plant is now in its normal shutdown electrical lineup.
The licensee has notified Oconee and Pickens counties and will be notifying the NRC Resident Inspector.
Notified R2DO (Ehrhardt), NRR EO (Miller), IRD MOC (Gott), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email) and NuclearSSA (email). | | ENS 53190 | 1 February 2018 16:08:00 | Nine Mile Point | NRC Region 1 | Nine Mile Point unit 2 experienced an unusual event due to a small fire in the turbine building that was immediately extinguished and then reflashed. The fire was declared out at 1119 (EST), 2/1/18. The fire was caused when steam leak repair injection equipment failed and leaked onto hot piping. There was no equipment damage or impact to plant operation. The fire was extinguished by the fire brigade. Offsite assistance was not required.
The fire resulted from Furmanite repair of a Moisture Separator Reheater inlet flow control valve. The unusual event will be terminated when sufficient lagging is removed to verify the extent of leaked fluid.
The licensee notified the NRC Resident Inspector.
Notified DHS SWO, FEMA, DHS NICC, and NNSA (via e-mail).
- * * UPDATE AT 1240 EST ON 2/1/2018 FROM ANTHONY PETRELLI TO MARK ABRAMOVITZ * * *
The unusual event was terminated at 1211 EST.
The licensee notified the NRC Resident Inspector.
Notified the R1DO (Janda), NRR EO (Miller), IRD MOC (Grant), DHS SWO, FEMA, DHS NICC, and NNSA (via e-mail). | | ENS 53153 | 6 January 2018 10:24:00 | Oyster Creek | NRC Region 1 | 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). | | ENS 53111 | 11 December 2017 04:50:00 | Saint Lucie | NRC Region 2 | St. Lucie Unit 1 declared an Unusual Event due to a smoke detector alarm received in the Unit 1 Containment Building that was unable to be confirmed within 15 minutes. A Containment entry was completed and no evidence of fire was found. The Unusual Event was terminated at 00:26 on 12/11/17.
State and local officials have been notified by the licensee.
The NRC Resident Inspector has been notified of this by licensee.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), and DHS Nuclear SSA (email). | | ENS 53101 | 30 November 2017 21:57:00 | Hope Creek | NRC Region 1 | An Unusual Event was declared at 1657 EST due to an earthquake detected onsite. The Unusual Event was declared under EAL HU1.1. There is no release in progress due to this event. There are no protective actions recommended at this time.
The Licensee will notify the NRC Resident Inspector.
Note: See also EN #53099 for Salem Unusual Event.
- * * UPDATE FROM JOSHUA MYERS TO DONALD NORWOOD AT 1742 EST ON 11/30/2017 * * *
An earthquake was felt onsite at time 1645 EST. Multiple phone calls were made to the Control Room confirming the earthquake. It was verified there was an earthquake felt in Delaware with a magnitude of 4.4. Neither seismic monitor at Salem Unit 1, Salem Unit 2, and Hope Creek actuated. There is no indication of any damage to any systems or plant structures. Plant walk-downs have been initiated in accordance with plant operating procedures for a seismic event. No injuries have been reported to the Control Room.
The licensee will notify the NRC Resident Inspector and State and local government agencies.
Notified R1DO (Gray), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), and DHS Nuclear SSA (email).
- * * UPDATE FROM THOMAS CLARK TO DAVID AIRD AT 2137 EST ON 11/30/2017 * * *
The licensee terminated the Unusual Event at 2125 EST on 11/30/2017 following plant walkdowns that revealed no damage to plant structures, systems, or components.
The NRC Resident Inspector has been notified.
Notified R1DO (Gray), IRD (Grant), and NRR EO (Miller), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), and DHS Nuclear SSA (email). | | ENS 53099 | 30 November 2017 21:57:00 | Salem | NRC Region 1 | An Unusual Event was declared at 1657 EST due to an earthquake detected onsite. The Unusual Event was declared under EAL HU1.1. There is no release in progress due to this event. There are no protective actions recommended at this time.
The Licensee will notify the NRC Resident Inspector.
Note: See also EN #53101 for Hope Creek Unusual Event.
- * * UPDATE FROM JOSHUA MYERS TO DONALD NORWOOD AT 1742 EST ON 11/30/2017 * * *
An earthquake was felt onsite at time 1645 EST. Multiple phone calls were made to the Control Room confirming the earthquake. It was verified there was an earthquake felt in Delaware with a magnitude of 4.4. Neither seismic monitor at Salem Unit 1, Salem Unit 2, and Hope Creek actuated. There is no indication of any damage to any systems or plant structures. Plant walk-downs have been initiated in accordance with plant operating procedures for a seismic event. No injuries have been reported to the Control Room.
The licensee will notify the NRC Resident Inspector and State and local government agencies.
Notified R1DO (Gray), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), and DHS Nuclear SSA (email).
- * * UPDATE FROM THOMAS CLARK TO DAVID AIRD AT 2137 EST ON 11/30/2017 * * *
The licensee terminated the Unusual Event at 2125 EST on 11/30/2017 following plant walkdowns that revealed no damage to plant structures, systems, or components.
The NRC Resident Inspector has been notified.
Notified R1DO (Gray), IRD (Grant), and NRR EO (Miller), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), and DHS Nuclear SSA (email). | | ENS 53085 | 22 November 2017 14:37:00 | Saint Lucie | NRC Region 2 | St. Lucie Unit 2 declared an Unusual Event due to a smoke detector alarm received in the Unit 2 Containment Building that was unable to be confirmed within 15 minutes. A Containment entry is currently being planned to determine the validity of the alarm.
State and local officials have been notified by the licensee.
The NRC Resident Inspector has been notified.
Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
- * * UPDATE ON 11/22/17 AT 1143 EST FROM JULIUS FLETCHER TO JEFF HERRERA * * *
Personnel entered Containment to determine conditions and found no evidence of smoke, fire or damage to equipment. Event terminated at 1127 EST 11/22/17.
The NRC Resident Inspector has been notified.
Notified R2DO (Suggs), R2 DRA (Dudes), NRR (Brock), IRD (Gott), and NRR EO (Miller), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email). | | ENS 53069 | 14 November 2017 17:18:00 | Cooper | NRC Region 4 | At 1118 CST on 11/14/17, Cooper Nuclear Generating Station declared an Unusual Event due to a hydrogen leak on a main generator purge line. The leak was reported to be caused by Maintenance cutting into a one inch line. The total size of the leak is unknown, however, it is estimated to be depressurizing in the main generator at approximately 1lb per hour. The current pressure is 52 to 53 lbs. pressure and is stable. The operations staff have entered their abnormal procedure and are taking actions to isolate the leak. Operators have isolated the source of hydrogen and have opened the exterior roll up doors to increase the airflow and minimize the concentration of hydrogen in the area. The area has been evacuated and hot work has been stopped.
The NRC Resident Inspector has been notified.
Notified DHS, FEMA, NICC and NNSA (via email).
- * * UPDATE AT 1433 EST ON 11/14/2017 FROM ROY GILES TO MARK ABRAMOVITZ * * *
On 11/14/2017, Nebraska Public Power District will issue a press release concerning the declaration of a Notification of Unusual Event (EN#53069) declared today at 1118 (CST) for a small hydrogen leak in the turbine building.
This is a four hour report per 10CFR50.72(b)(2)(xi) for any event or situation for which a news release is planned or notification to other government agencies has been or will be made which is related to heightened public or government concern.
Notified the R4DO (Kozal).
- * * UPDATE AT 1904 EST ON 11/14/17 FROM TRENT SYDOW TO JEFF HERRERA * * *
At 1744 CST the licensee exited from the Unusual Event. The leak was patched under a temporary repair. The patch was tested to verify the leak has stopped.
The NRC Resident Inspector was notified.
Notified the R4DO (Kozal), IRDMOC (Gott), NRR EO (Miller), DHS, FEMA, NICC and NNSA (via email). |
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