05000328/LER-2023-001, Inoperable Ice Condenser Intermediate Deck Doors Results in Condition Prohibited by Technical Specifications
| ML23158A170 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/07/2023 |
| From: | Marshall T Tennessee Valley Authority |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| LER 2023-001-00 | |
| Download: ML23158A170 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 3282023001R00 - NRC Website | |
text
Sequoyah Nuclear Plant, Post Office Box 2000, Soddy Daisy, Tennessee 37384 June 07, 2023 10 CFR 50.73 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Sequoyah Nuclear Plant, Unit 2 Renewed Facility Operating License No. DPR-79 NRC Docket No. 50-328
Subject:
Licensee Event Report 50-328/2023-001-00, Inoperable Ice Condenser Intermediate Deck Doors Results in Condition Prohibited by Technical Specifications The enclosed licensee event report provides details concerning entry into a Mode of Applicability with inoperable ice condenser intermediate deck doors. This report is being submitted in accordance with 10 CFR 50.73(a)(2)(i)(B), as any operation or condition which was prohibited by the unit¶s Technical Specifications.
There are no 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, Thomas Marshall Site Vice President Sequoyah Nuclear Plant Enclosure: Licensee Event Report 50-328/2023-001-00 cc:
NRC Regional Administrator +/- Region II NRC Senior Resident Inspector +/- Sequoyah Nuclear Plant
Abstract
On April 11, 2023, with Unit 2 in Mode 5, a surveillance instruction (SI) associated with the ice condenser intermediate deck doors was completed by Maintenance Services personnel and provided to Operations personnel for review. Personnel from both groups failed to recognize that the acceptance criteria associated with four ice condenser intermediate deck doors were not met. At 2035 eastern daylight time, the unit entered a Technical Specification (TS) Limiting Condition for Operation (LCO) 3.6.13 applicable mode, Mode 4, with four inoperable intermediate deck doors. Because SQN Unit 2 entered an applicable mode without meeting TS LCO 3.6.13, this is a condition prohibited by TS and is therefore being reported in accordance with 10 CFR 50.73(a)(2)(i)(B), as any operation or condition which was prohibited by the plant¶s Technical Specifications.
The cause of the event was an error trap in the SI procedure, in that, the acceptance criteria in the SI procedure were not distinct for the particular door being tested to alert the performer and the reviewer of the acceptable values.
The corrective action was to revise the SI procedure to remove the error trap by listing the specific acceptance criteria to each door being surveilled.
VIII. Additional Information
There is no additional information.
IX.
Commitments
There are no new commitments.