ML23024A029

Part 21 Interim Report of a Deviation or Failure to Comply Associated with a Limitorque Actuator

ML23024A029
Person / Time
Site:	Sequoyah
Issue date:	01/24/2023
From:	Marshall T Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
Download: ML23024A029 (1)

Text

Sequoyah Nuclear Plant, Post Office Box 2000, Soddy Daisy, Tennessee 37384

January 24, 2023 10 CFR 21.21(a)(2)

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Sequoyah Nuclear Plant, Unit 1 Renewed Facility Operating License No. DPR-77 NRC Docket No. 50-327

Subject:

Interim Report of a Deviation or Failure to Comply Associated with a Limitorque Actuator

In accordance with the requirements of 10 CFR 21.21(a)(2), the Tennessee Valley Authority is submitting this interim report for Sequoyah Nuclear Plant (SQN), Unit 1.

On October 19, 2022, during as-left testing of the Unit 1, turbine-driven auxiliary feedwater pump, trip and throttle valve (actuator, QA 1, motor operated valve, Limitorque model SMB-000) a motor (the motor is a sub-component of the valve actuator) anomaly was identified. The motor test revealed higher than expected current and the motor was running at higher-than-expected RPMs. The increased current appeared to be associated with the motor shunt winding. On December 1, 2022, SQN completed its 10 CFR Part 21 discovery process and determined the need to perform a 10 CFR Part 21 Evaluation.

The motor was returned to Flowserve (at Framatomes request) for evaluation. The vendor evaluation is ongoing and will not be complete in time to support the requirement to complete SQNs Evaluation within 60 days. Because the 10 CFR Part 21 Evaluation cannot be completed within 60 days of discovery, SQN is submitting this interim report.

SQN intends to complete the 10 CFR Part 21 Evaluation no later than March 1, 2023.

There are no new regulatory commitments contained in this letter. Should you have any questions concerning this submittal, please contact Mr. Rick Medina, Site Licensing Manager, at (423) 843-8129.

Respectfully,

Digitally signed by Lovitt, Matthew Robert Lovitt, Matthew DN: dc=gov, dc=tva, dc=main, ou=Main, ou=Remote Sites, ou=Users, ou=SQN, cn=Lovitt, Matthew Robert, email=mrlovitt@tva.gov Robert Reason: I am the author of this document Date: 2023.01.24 07:37:14 -05'00' IRUThomas B. Marshall

Site Vice President Sequoyah Nuclear Plant U.S. Nuclear Regulatory Commission Page 2 January 24, 2023

cc: NRC Regional Administrator - Region II NRC Senior Resident Inspector - Sequoyah Nuclear Plant