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Event Notification Report for September 18, 2024

U.S. Nuclear Regulatory Commission
Operations Center

EVENT REPORTS FOR
09/17/2024 - 09/18/2024

Agreement State
Event Number: 56969
Rep Org: New York State Dept. of Health
Licensee: Cardinal Health
Region: 1
City: Plainview   State: NY
County:
License #: C3046
Agreement: Y
Docket:
NRC Notified By: Daniel Samson
HQ OPS Officer: Bill Gott
Notification Date: 02/15/2024
Notification Time: 09:49 [ET]
Event Date: 02/05/2024
Event Time: 09:00 [EST]
Last Update Date: 09/17/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Bickett, Carey (R1DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB (EMAIL)
CNSC (Canada) (EMAIL)
Event Text
EN Revision Imported Date: 9/18/2024

EN Revision Text: AGREEMENT STATE REPORT - LOST SOURCE

The following information was provided by the New York State Department of Health (the Department) via fax:

"The radiation safety officer for Cardinal Health (New York State (NYS) Radioactive Materials License (RAML) C3046) noted a missing vial of ln-111 oxyquinoline (oxine) on the morning of 02/05/24. The Administrative Director phoned NYS Department of Health (DOH) on 02/06/24 at 1500 EST, to report the missing vial. The vial contained approximately 1 millicurie of ln-111 at the time of transfer. The sealed vial was shipped from the Cardinal Health facility, RAML C2593, in Bronx, NY, by company courier, received at [the Plainview facility], RAML C3046, and subsequently lost. This shipment was a transfer between Cardinal Health facilities and not to the end user for clinical administration. To date, Cardinal Health has not located the vial, but is actively attempting to locate its whereabouts and investigate the root cause.

"Based on information at this time, external radiation levels outside of the shipping container would not likely pose any concern or adverse health risks to members of the public, including couriers. As of the date and time of this notification, the expected activity of the vial is estimated to be 0.56 millicuries and will rapidly decay to background levels provided the short half-life of ln-111 (2.8 days). In accordance with 10 CFR 20.2201(a)(ii), the activity of ln-111 was approximately 10 times the quantity specified in Appendix C to 10 CFR 20, which prompts a 30-day telephone report and subsequent written report within 30 days of the initial notification to the Department. It is possible that due to the short half-life, this vial may in actuality contain less than the reportable quantity prescribed by 10 CFR 20.2201(a), however, this event is being reported out of an abundance of caution as the circumstances around this lost vial are not immediately available. NYSDOH is actively monitoring this incident and has assigned incident number 1474 to track this event. Cardinal Health is currently working through the initial investigation of this event, and anticipates submitting a thorough outline of their investigation, primary and contributing causes, and steps to prevent recurrence as prescribed in addition to all items prescribed by 10 CFR 20.2201(b), under NYS (10 NYCRR 16.15) requirements."

New York State Event Report Number: NY-24-01

* * * UPDATE ON 9/17/2024 AT 1517 EDT FROM NATE KISHBAUGH TO ROBERT THOMPSON * * *

The following information was provided by the New York State Department of Health (NYSDOH) via email:

"Cardinal Health (the licensee) provided a description of the event, actions taken to attempt to recover the vial, and preventative measures to prevent recurrence. The licensee interviewed staff, performed recovery surveys, and provided an investigation to attempt to locate this source. It is believed that this In-111 vial was placed on a cart with return waste in a similar delivery case, and it was inadvertently mistaken as returned customer waste. The vial was likely placed into decay-in-storage. To date, the vial in question has not been recovered and has decayed to background levels. To prevent recurrence, delivery personnel are required to immediately sign all acknowledgements of receipt prior to transferring the package and leaving the facility.

"NYSDOH has accepted these corrective actions and will evaluate them on the next inspection. This event was closed by NYSDOH."

Notified R1DO (Werkheiser), NMSS Events Notification (email), ILTAB (email), Canadian Nuclear Safety Commission (email).

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf


Part 21
Event Number: 57243
Rep Org: RSSC dba Marmon
Licensee:
Region: 1
City: East Granby   State: CT
County:
License #:
Agreement: N
Docket:
NRC Notified By: Phillip Sargenski
HQ OPS Officer: Adam Koziol
Notification Date: 07/25/2024
Notification Time: 11:05 [ET]
Event Date: 07/23/2024
Event Time: 00:00 [EDT]
Last Update Date: 09/17/2024
Emergency Class: Non Emergency
10 CFR Section:
21.21(d)(3)(i) - Defects And Noncompliance
Person (Organization):
Lilliendahl, Jon (R1DO)
Feliz-Adorno, Nestor (R3DO)
Azua, Ray (R4DO)
Part 21/50.55 Reactors, - (EMAIL)
Event Text
EN Revision Imported Date: 9/18/2024

EN Revision Text: PART 21 REPORT - NON-COMPLAINT INSULATED CONDUCTOR

The following is a synopsis of information received via fax:

A reel of insulated conductor was found non-compliant due to failure of insulation tensile and elongation at break test following air oven aging. Wire from the non-compliant reel was delivered to nine plants.

Affected plants: Wolf Creek, Dresden, LaSalle, Limerick, Peach Bottom, Arkansas Nuclear One, Waterford, Susquehanna, and Davis Besse.

Reporting company point of contact:
RSSC Wire and Cable LLC
dba Marmon Industrial Energy and Infrastructure
20 Bradley Park Road
East Granby, CT 06026

Phillip Sargenski - Quality Assurance Manager
Phone: 860-653-8376
Fax: 860-653-8301
Phillip.sargenski@marmoniei.com


* * * UPDATE ON 08/23/24 AT 1315 EDT FROM PHILLIP SARGENSKI TO JOSUE RAMIREZ * * *

The vendor provided the final report for this event listing corrective actions and the estimated completion dates.

Notified R1DO (Lilliendahl), R3DO (Skokowski), R4DO (Vossmar), and Part 21 group (Email).

* * * UPDATE ON 09/04/24 AT 1044 EDT FROM PHILLIP SARGENSKI TO NESTOR MAKRIS * * *

The vendor notified the NRC that they plan to send additional finding data regarding this notification via fax and/or email within the next day or two.

Notified R1DO (Ferdas), R3DO (Hills), R4DO (Drake), and Part 21 group (Email).

* * * UPDATE ON 09/06/24 AT 1327 EDT FROM PHILLIP SARGENSKI TO ADAM KOZIOL * * *

The vendor identified an additional non-compliant shipment of insulated conductor.

Affected plant: Calvert Cliffs

Notified R1DO (Ferdas), R3DO (Hills), R4DO (Drake), and Part 21 group (Email).

* * * UPDATE ON 9/17/24 AT 1641 EDT FROM PHILLIP SARGENSKI TO ROBERT THOMPSON * * *

The vendor identified an additional non-compliant shipment of insulated conductor.

Affected customer: Curtiss-Wright Nuclear Division.

Notified R1DO (Werkheiser), R3DO (Ziolkowski), R4DO (Azua), and Part 21 group (Email).


Agreement State
Event Number: 57268
Rep Org: New York State Dept. of Health
Licensee: NY Dept. of Health Wadsworth Center
Region: 1
City: Albany   State: NY
County:
License #: 0448
Agreement: Y
Docket:
NRC Notified By: Nathaniel Kishbaugh
HQ OPS Officer: Josue Ramirez
Notification Date: 08/12/2024
Notification Time: 16:38 [ET]
Event Date: 08/06/2024
Event Time: 00:00 [EDT]
Last Update Date: 09/17/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Ford, Monica (R1DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Event Text
EN Revision Imported Date: 9/18/2024

EN Revision Text: AGREEMENT STATE REPORT - LEAKING SOURCE

The following information was provided by the New York State Department of Health (NYSDOH) via email:

"NYSDOH Bureau of Environmental Radiation Protection (BERP) received an email from the radiation safety officer (RSO) of NYSDOH Wadsworth Laboratories on August 12, 2024, to report a leaking Ni-63 electron capture device (ECD) contained within a decommissioned gas chromatograph. This sample was collected on August 6, 2024, and was analyzed (and quality control tested) following collection.

"Device Make: Agilent Technologies, Inc.
"Device Model: 19233
"Device Serial Number: L2075
"Isotopes: Ni-63 (18 mCi at time of manufacture)

"NYSDOH Wadsworth Laboratory staff were conducting a leak test and wipe of a decommissioned gas chromatography unit that had not been used for over 20 years. The ECD housing within the unit did have removable contamination detected at 30,000 disintegrations per minute (approximately 0.015 micro Ci) when analyzed using a liquid scintillation counter. The gas chromatograph was isolated, and an enhanced survey showed that the gas chromatograph chamber (which sits below the ECD housing) had removable contamination consistent with the ECD housing. Other areas of the gas chromatograph were surveyed and showed levels indistinguishable from background. Furthermore, checks of areas around the gas chromatograph were surveyed as well as personnel and personal protective equipment and no levels exceeding background were discovered. The extent of contamination appears to be isolated to the open port of the ECD, which has been sealed.

"The entire gas chromatograph is isolated pending disposal. NYSDOH Wadsworth staff contacted the RSO for Agilent [Technologies] and confirmed that the device may be sent to them for disposal."

"The cause of this leaking source is unknown as the device had been removed from service for several decades. Routine surveys have indicated that the extent of contamination was localized to areas of the chromatograph that would not be touched or in contact with any laboratory equipment or personnel.

"NYSDOH BERP is actively monitoring this event under Incident No. 1497. Additional information will be provided to the Nuclear Material Events Database (NMED) once available."

Event Report ID No. NY-24-08
NYSDOH Incident Number: 1497

* * * UPDATE ON 9/17/2024 AT 1355 EDT FROM NATE KISHBAUGH TO ROBERT THOMPSON * * *

The following information was provided by the New York State Department of Health (NYSDOH) via email:

"The leaking source and affected device in question were returned to the vendor in Wilmington, DE. On September 3, 2024, NYSDOH received an acknowledgement of receipt of the device. The exact cause of the leaking source is unknown, however, NYSDOH will focus on this aspect during the next routine inspection to inquire if any contributing or primary causes for this leaking source maybe attributed to the use, maintenance, or storage of these types of devices. Any additional follow-up will occur under the scope of the inspection; therefore, NYSDOH has closed out this incident."

Notified R1DO (Werkheiser), NMSS Events Notification (email).


Agreement State
Event Number: 57293
Rep Org: Georgia Radioactive Material Pgm
Licensee: PIEDMONT ATHENS REGIONAL MED CENTER
Region: 1
City: Athens   State: GA
County:
License #: GA 4-1
Agreement: Y
Docket:
NRC Notified By: Kaamilya Najeeullah
HQ OPS Officer: Robert A. Thompson
Notification Date: 08/27/2024
Notification Time: 15:12 [ET]
Event Date: 08/26/2024
Event Time: 00:00 [EDT]
Last Update Date: 09/17/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Gray, Mel (R1DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Event Text
EN Revision Imported Date: 9/18/2024

EN Revision Text: AGREEMENT STATE - MEDICAL UNDERDOSE

The following is a summary of information provided by the Georgia Radioactive Materials Program (the Program) via email:

The radiation safety officer (RSO) at Piedmont Athens Regional Medical Center notified the Program on August 26, 2024, that an incident occurred with Y-90 underdose. The catheter line became kinked during the procedure and the dose given was more than 20 percent below the planned dose.

The RSO will send an official written report to the Program within 15 days.

Georgia Incident Number: 86

A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.

* * * UPDATE ON 9/17/2024 AT 1131 EDT FROM KAAMILYA NAJEEULLAH TO ROBERT THOMPSON * * *

The following information was provided by the Georgia Radioactive Materials Program (the Program) via email:

"The Program received the official written report from the licensee radiation safety officer (RSO) on September 12, 2024. The RSO stated that one dosage was successfully delivered. The second dosage was not fully delivered due to a kink in the catheter.

"Prescribed dosage: 15.68 mCi and 16.76 mCi Y-90 microspheres

"Administered dosage: 5.39 mCi and 16.87 mCi Y-90 microspheres"

Notified R1DO (Werkheiser), NMSS Events Notification (email).


Agreement State
Event Number: 57315
Rep Org: NJ Rad Prot And Rel Prevention Pgm
Licensee: Cooper Health System at Camden
Region: 1
City: Camden City   State: NJ
County:
License #: 438814
Agreement: Y
Docket:
NRC Notified By: Claire Drozd
HQ OPS Officer: Ernest West
Notification Date: 09/11/2024
Notification Time: 14:09 [ET]
Event Date: 09/09/2024
Event Time: 12:07 [EDT]
Last Update Date: 09/11/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Elkhiamy, Sarah (R1DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB, (EMAIL) (EMAIL)
Event Text
AGREEMENT STATE REPORT - LOST EXIT SIGN

The following information was provided by the New Jersey Department of Environmental Protection (NJDEP) via email:

"On September 9, 2024, during a routine inspection of the licensee, information for the exit sign was provided to the radiation safety officer (RSO). The inspectors asked for the sign's location and for the facility contact listed to be updated if necessary. After the inspection, follow up emails and searches of the facility led to the determination that the sign could not be located. The sign's manufacturer was contacted to confirm whether or not the sign might have been returned. SRB Technologies (the manufacturer) confirmed that the sign was not assigned a return number, and that paperwork for its return was not submitted. After additional follow up with the RSO, and final search of the facility, it was determined that the sign has been lost."

New Jersey Event Report ID number: To be determined.

Additional information: The lost exit sign contained approximately 9210 millicuries of tritium (H-3).

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf


Agreement State
Event Number: 57316
Rep Org: Illinois Emergency Mgmt. Agency
Licensee: Exxon Mobil Oil Corp
Region: 3
City: Channahon   State: IL
County:
License #: IL-01742-01
Agreement: Y
Docket:
NRC Notified By: Gary Forsee
HQ OPS Officer: Ernest West
Notification Date: 09/11/2024
Notification Time: 14:31 [ET]
Event Date: 09/10/2024
Event Time: 00:00 [CDT]
Last Update Date: 09/11/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Ziolkowski, Michael (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Event Text
AGREEMENT STATE - STUCK OPEN GAUGE

The following information was provided by the Illinois Emergency Management Agency (the Agency) via email:

"On September 11, 2024, the Agency was contacted by a representative for the Exxon Mobile refinery in Channahon to advise of a fixed gauge containing 20 mCi of Cs-137 [sealed source] had a reportable equipment failure. Specifically, on September 10, 2024, during routine shutter checks, the handle that operates the shutter broke off, leaving the gauge in the open position. The gauge is mounted to a production vessel which is full of commodity. There were no exposures, and due to the vessel being in use, personnel exposure is not a concern. The manufacturer has been contacted for repairs. The licensee met the notification requirements. This report will be updated with the source serial number and verification of repair and replacement upon receipt."

Illinois Event Item Number: IL240021


Agreement State
Event Number: 57317
Rep Org: Texas Dept of State Health Services
Licensee: EQUISTAR CHEMICALS LP
Region: 4
City: Bay City   State: TX
County:
License #: L03938
Agreement: Y
Docket:
NRC Notified By: Art Tucker
HQ OPS Officer: Ernest West
Notification Date: 09/11/2024
Notification Time: 16:52 [ET]
Event Date: 09/11/2024
Event Time: 00:00 [CDT]
Last Update Date: 09/11/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Dixon, John (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Event Text
AGREEMENT STATE - STUCK OPEN SHUTTER

The following information was provided by the Texas Department of State Health Services (the Department) via email:

"On September 11, 2024, the Department was notified by the licensee that the shutter on a Ronan model SA-1 gauge containing a 50 millicurie Cs-137 source, was found stuck in the open position during routine testing. Open is the normal position for the gauge. The licensee reported that there is no risk of additional radiation exposure to members of the general public or radiation workers due to this on/off mechanism failure. Additional information will be provided as it is received in accordance with SA-300."

Texas Incident Number: I-10129


Agreement State
Event Number: 57318
Rep Org: Tennessee Div of Rad Health
Licensee: ARTAZN, LLC
Region: 1
City: Greenville   State: TN
County:
License #: R-30012
Agreement: Y
Docket:
NRC Notified By: Andrew Holcomb
HQ OPS Officer: Ernest West
Notification Date: 09/11/2024
Notification Time: 17:41 [ET]
Event Date: 08/20/2024
Event Time: 00:00 [EDT]
Last Update Date: 09/11/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Elkhiamy, Sarah (R1DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Event Text
AGREEMENT STATE - STUCK OPEN SHUTTER

The following information was provided by the Tennessee Division of Radiological Health via email:

"On August 20, 2024, during a routine calibration of a Global Gauge SS3A, employees at Artazn, LLC were unable to get stable readings. A Global Gauge technician arrived on August 22, 2024, and discovered that the shutter on the gauge was partially stuck open even though operator panel was showing everything as normal. The maximum exposure to workers was calculated to be 3.7 mrem. The available device information is as follows:

"Manufacturer: Global Gauge
"Model: SS3A
"Serial Number: 8376LV
"Isotope: Am-241, 1000 millicuries

"Corrective actions or reports will be updated with a report within 30 days."

Tennessee Event Report ID Number: TN-24-068


Power Reactor
Event Number: 57322
Facility: Brunswick
Region: 2     State: NC
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: Joseph Atkinson
HQ OPS Officer: Robert A. Thompson
Notification Date: 09/16/2024
Notification Time: 13:02 [ET]
Event Date: 09/16/2024
Event Time: 12:40 [EDT]
Last Update Date: 09/17/2024
Emergency Class: Unusual Event
10 CFR Section:
50.72(a) (1) (i) - Emergency Declared
Person (Organization):
Suber, Gregory (R2DO)
Laura Dudes (RA)
Andrea Veil (NRR)
Craig Erlanger (NSIR)
Crouch, Howard (IR)
Power Reactor Unit Info
Unit SCRAM Code RX Crit Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation
Event Text
EN Revision Imported Date: 9/18/2024

EN Revision Text: NOTIFICATION OF UNUSUAL EVENT DUE TO SITE ACCESS IMPEDED

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).


Power Reactor
Event Number: 57324
Facility: Watts Bar
Region: 2     State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Chris Mitschelen
HQ OPS Officer: Robert A. Thompson
Notification Date: 09/16/2024
Notification Time: 16:30 [ET]
Event Date: 07/22/2024
Event Time: 12:48 [EDT]
Last Update Date: 09/16/2024
Emergency Class: Non Emergency
10 CFR Section:
50.73(a)(1) - Invalid Specif System Actuation
Person (Organization):
Suber, Gregory (R2DO)
Power Reactor Unit Info
Unit SCRAM Code RX Crit Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
Event Text
EN Revision Imported Date: 9/17/2024

EN Revision Text: 60-DAY NOTIFICATION OF INVALID SPECIFIED SYSTEM ACTUATION

The following information was provided by the licensee via phone and email:

"At 1248 EDT on July 22, 2024, with Unit 1 in mode 1 at 100% power, a complete actuation of the 'A' train containment ventilation isolation (CVI) occurred. The 'A' train CVI resulted from the failure of a radiation monitor providing input to the isolation circuitry. This radiation monitor was subsequently repaired and a restoration from the CVI was made. The CVI removes containment purge from operation should it be in service and secures other radiation monitors which measure reactor coolant system leakage.

"This report is being made under 10 CFR 50.73(a)(2)(iv)(A) as an event that resulted in an invalid actuation of the 'A' train CVI.

"There was no impact on the health and safety of the public or plant personnel.

"The NRC Resident Inspector was notified of the event."


Power Reactor
Event Number: 57325
Facility: Fermi
Region: 3     State: MI
Unit: [2] [] []
RX Type: [2] GE-4
NRC Notified By: Richard Beck
HQ OPS Officer: Robert A. Thompson
Notification Date: 09/16/2024
Notification Time: 20:24 [ET]
Event Date: 09/16/2024
Event Time: 13:29 [EDT]
Last Update Date: 09/16/2024
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(xiii) - Loss Comm/Asmt/Response
Person (Organization):
Ziolkowski, Michael (R3DO)
Power Reactor Unit Info
Unit SCRAM Code RX Crit Initial PWR Initial RX Mode Current PWR Current RX Mode
2 N Y 100 Power Operation 100 Power Operation
Event Text
ACTIVE SEISMIC MONITORING SYSTEM INOPERABLE

The following information was provided by the licensee via phone and email:

"On September 16, 2024, at 1329 EDT, the Fermi 2 active seismic monitoring system provided indication of a potential seismic activity event. Plant abnormal procedures were entered and compensatory measures were met and remain in place. Neither the United States Geological Survey (USGS), nor the next closest nuclear power plant could confirm or validate the readings obtained at Fermi. The seismic monitoring system was declared inoperable to validate the calibration of the system. Fermi 2 has two active seismic monitors. One on the reactor pressure vessel pedestal and one in the high pressure core injection (HPCI) room. Only the HPCI room seismic monitor was declared inoperable. The HPCI room accelerometer is the sole 'trigger' for the seismic recording system (which outputs peak accelerations experienced during a seismic event) and the associated control room alarm. This is used in assessment of the magnitude of an earthquake for emergency action level HU 2.1.

"The loss of the active seismic monitoring system is reportable to the NRC within 8 hours of discovery in accordance with 10 CFR 50.72(b)(3)(xiii).

"No seismic activity has been felt onsite and the USGS recorded no seismic activity in the area.

"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 confirmed alternative means of recognizing a seismic event for emergency plan entry are available.


Power Reactor
Event Number: 57326
Facility: Vogtle 3/4
Region: 2     State: GA
Unit: [3] [] []
RX Type: [3] W-AP1000,[4] W-AP1000
NRC Notified By: Jason Hayes
HQ OPS Officer: Sam Colvard
Notification Date: 09/17/2024
Notification Time: 04:48 [ET]
Event Date: 09/17/2024
Event Time: 01:27 [EDT]
Last Update Date: 09/17/2024
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical
50.72(b)(2)(iv)(A) - ECCS Injection
50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
Person (Organization):
Suber, Gregory (R2DO)
Crouch, Howard (IR)
Russell Felts (NRR EO) (NRR EO)
Power Reactor Unit Info
Unit SCRAM Code RX Crit Initial PWR Initial RX Mode Current PWR Current RX Mode
3 A/R Y 100 Power Operation 0 Safe Shutdown
Event Text
AUTOMATIC REACTOR TRIP AND MANUAL SAFEGUARDS ACTUATION

The following information was provided by the licensee via phone and email:

"At 0127 EDT on 9/17/2024, with Unit 3 in mode 1 at 100% power, the reactor automatically tripped due to the passive residual heat removal heat exchanger outlet flow control valve failing open. A manual safeguards actuation was initiated due to the lowering pressurizer water level resulting from the reactor coolant system cooldown that was caused by the passive residual heat removal heat exchanger outlet flow control valve failing open. The trip was not complex, with all safety systems responding normally post-trip.

"Operations responded and stabilized the plant. Decay heat is being removed by the passive residual heat removal heat exchanger. Units 1, 2, and 4 are not affected.

"Due to the core makeup tank actuation, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(A). The reactor protection system actuation while critical is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B). Additionally, this event is reportable per 10 CFR 50.72(b)(3)(iv)(A) as an event that resulted in a valid containment isolation actuation and a valid passive residual heat removal heat exchanger actuation.

"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 failure of the control valve does not inhibit the residual heat removal system from functioning as it is passive. The reactor coolant system maximum allowable cooldown rate was exceeded (Technical Specification 3.4.3). The limit is 100 degrees F per hour above 350 degrees F. The maximum observed cooldown rate was 226 degrees F per hour. At time 0458 EDT, reactor coolant system temperature is 369.1 degrees F, reactor pressure is 900 psig. Currently, the plant is not cooling down but is making ready to place shutdown cooling online.