Event Notification Report for August 19, 2022

AGREEMENT STATE REPORT - GAMMA KNIFE MALFUNCTION

The following information was provided by South Carolina Department of Health & Environmental Control via email:
"The South Carolina Department of Health and Environmental Control was notified on 08/10/2022, during a follow-up of a routine inspection, that a Leksell Gamma Knife Perfexion gamma stereotactic radiosurgery unit had failed to function as designed. The licensee [Prisma Health Richland Hospital] is reporting that during routine maintenance that was conducted by the manufacturer on 11/01/2021, it was discovered that a sector was dragging and not transferring smoothly. The licensee is reporting that one of the sealed sources had slipped less than 1/8 inch within one of the source cavities of the Leksell Gamma Knife Perfexion unit. The sealed source is a Co-60 Elekta Model 43685 medical teletherapy source, with an estimated activity between 20-22 curies. The licensee is reporting the unit was repaired and source reseeded on 11/05/2021. The licensee is reporting no overexposures to workers, patients, or members of the public. All sealed sources were leak tested on 11/05/2021 and results indicated that no sources were leaking. This event is under investigation by the South Carolina Department of Health and Environmental Control."

AGREEMENT STATE REPORT - STUCK SHUTTER

The following was reported by the State of Tennessee via email:

"During weekly checks on the device located on a kiln scrubber sump tank, it was discovered by a Vega [device manufacturer] technician that the shutter would not close on the device. The shutter is in the 'open' position, which is the normal operating position. The technician deemed it to be unrepairable in the field. The licensee is in contact with the manufacturer to have the device removed. Licensee estimates 2-3 weeks before a replacement can be ordered. The device information is as follows:

Manufacturer: Ohmart/Vega
Model: SH-F1
Isotope: Cs-137, 50 mCi
Source Model: A-2102 (originally CDC 700)
Source SN: 6648GK

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

Tennessee State Event Report ID NO.: TN-22-059

PART 21 INTERIM REPORT OF DEVIATION

The following is a summary of a report provided by Southern Nuclear:

On May 23, 2022, Framatome notified Farley Nuclear Power Plant, among other plants, by letter of a potential nonconformance in certain Siemens medium voltage circuit breakers that could create a substantial safety hazard in certain applications. Southern Nuclear has determined that additional time beyond the 60-day evaluation period is needed to perform the necessary walkdowns of the installed equipment and complete the substantial safety hazard evaluation for reportability in accordance with 10 CFR 21. At the time, Framatome did not have enough information to determine where licensees intended to or had installed the supplied breakers, or how many breakers within the population supplied were actually nonconforming. The interim report does not describe details of the nonconformance and the original May 23, 2022 letter was not sent to the Headquarters Operations Center.

Contact Information:
Ryan Joyce, Fleet Licensing Manager, (205) 992-6468

Known affected plant: Farley among others

SAFETY SYSTEM INOPERABILITY

The following information was provided by the licensee via email:

"At 2108 EDT on August 17, 2022 the Division 2 Mechanical Draft Cooling Tower (MDCT) fans were declared inoperable due to failure of the over speed fan brake inverter. The brakes prevent fan over speed from a design basis tornado. The MDCT fans are required to support operability of the Ultimate Heat Sink (UHS). The UHS is required to support operability of the Division 2 Emergency Equipment Cooling Water (EECW) system. The Division 2 EECW system cools various safety related components, including the High Pressure Coolant Injection (HPCI) room cooler and Division 2 Control Center HVAC (CCHVAC) chiller. An unplanned HPCI inoperability occurred based on a loss of the HPCI Room Cooler. At the time of the event, Division I CCHVAC was inoperable for maintenance (but was running for a maintenance run) and the event caused an inoperability of Division 2 CCHVAC. This resulted in an inoperability of both divisions of CCHVAC. Failure of the Division 2 MDCT Fan brake inverter occurred due to a trip of the DC input breaker. The breaker was reset at 2128 EDT restoring Division 2 UHS Operability. This report is being made pursuant to 10CFR50.72(b)(3)(v)(D) as a condition that at the time of discovery could have prevented the fulfilment of the safety function of structures or systems that are needed to mitigate the consequences of an accident based on a loss of a single train safety system and loss of both divisions of a safety system.

"The Senior NRC Resident Inspector has been notified"