Event Notification Report for February 05, 2024

EN Revision Imported Date: 2/5/2024

EN Revision Text: PART 21 - INTERIM REPORT FOR BUTTWELD 90 DEGREE ELBOWS

The following is a synopsis of information that was provided by Tioga Pipe Incorporated via fax:

On November 15, 2023, nine pieces of one-inch buttweld long radius 90 degree elbows were determined not to meet correct thickness requirements. Three of the nine fittings were installed in the plant. The supplier requested that the uninstalled material be quarantined and tagged as nonconforming. The supplier doesn't know where the fittings were installed in the plant.

Brunswick Nuclear Generating Station is the only plant affected.

For questions concerning this 10 CFR 21 issue, please contact:
Bryan Nichols
Director of Quality Assurance
Tioga Pipe Incorporated
(484) 546-5613
bnichols@tiogapipe.com

* * * UPDATE ON 12/11/23 AT 0959 EST FROM SHANNON ECHOLS TO ERIC SIMPSON * * *

Duplicate Part 21 notification made by Mackson Nuclear, LLC. This notification is identical to the Part 21 notification made by Tioga Pipe Incorporated via fax to NRC on Friday, December 8, 2023. No additional information was provided.

Brunswick Nuclear Generating Station is the only plant affected.

Notified R2RDO (Miller) and Part 21 Group via email.

* * * UPDATE ON 02/02/24 AT 1001 EST FROM WILLIAM KOTCHER TO ERIC SIMPSON * * *

The following is information that was provided by Tioga Pipe Incorporated via fax:

"The licensee, Duke Energy - Brunswick Nuclear Plant, evaluated the installed elbows for acceptability in accordance with their corrective action program. Brunswick inspectors performed UT thickness evaluations of the installed nonconforming elbows (Fitting IDs: 16836-1-3, -14, and -20) and the results were used to confirm that the subject system remained operable. The remaining six nonconforming elbows (Fitting IDs: 16836-1-1, -6, -7, -11, -15, and -21) have been returned to the manufacturer, Flowline, and are being processed and controlled under Flowline's nonconforming items program."

The faxed information includes an attached E-mail chain of seven E-mails related to the Tioga Part-21 notification.

Questions are directed to William Kotcher, (713) 512-35699, or Bryan Nichols, (484) 546-5613.

Notified R2RDO (Miller) and Part 21 Group via email.

OFFSITE NOTIFICATION - WORKPLACE INJURY

The following information was provided by the licensee via email:

"On February 1, 2024, a contract worker was transported offsite for medical treatment due to a work-related injury that required the individual to be admitted to the hospital. The individual was free-released from the site prior to transport.

"The injury and hospitalization were reported by the contract worker's employer to OSHA per 29 CFR 1904.39(a)(2). Based upon that notification to another government agency, Tennessee Valley Authority is reporting this per 10 CFR 50.72(b)(2)(xi).

"The NRC Senior Resident Inspector has been notified of this event."

ACCIDENT MITIGATION - RELIEF VALVES INOPERABLE

The following information was provided by the licensee via email:

"At 1640 CST on February 1, 2024, it was determined that a condition occurred that could have prevented the fulfillment of a safety function due to two of the four steam generator (SG) power-operated relief valves (PORVs) being simultaneously inoperable. In certain accident scenarios, more than two PORVs are needed to mitigate the consequences of an accident; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v). The first PORV was declared inoperable at 1025 on January 22, 2024, and the safety function is considered to have been lost when the second PORV was declared inoperable at 1902 on January 23, 2024. The safety function was restored at 2234 on January 23, 2024, when the first SG PORV was declared operable. There was no impact to unit 2. 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 plant remained in mode 3 for the duration of the condition. The causes for the two PORVs being inoperable were neither related nor systemic in nature. All SG PORVs have been restored to operation.