ML24136A224
| ML24136A224 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/15/2024 |
| From: | Louis Mckown Division Reactor Projects II |
| To: | Tennessee Valley Authority |
| References | |
| EA-24-008 | |
| Download: ML24136A224 (3) | |
Text
NRC REGULATORY CONFERENCE MEETING
SUMMARY
Licensee: Tennessee Valley Authority (TVA)
Facility: Sequoyah Nuclear Plant, Units 1 and 2 License Nos. DPR-77 and DPR-79 Docket Nos.: 05000327 and 05000328 Date of Conference: May 2, 2024 Meeting No.: 0240551 Enforcement Action: EA-24-008
On May 2, 2024, representatives of TVA and Sequoyah Nuclear Plant met with U.S. Nuclear Regulatory Commission (NRC) personnel in the Region II office located in Atlanta, Georgia, with some NRC staff attending virtually via Microsoft Teams. The purpose of the regulatory conference was to discuss the apparent violation (AV) documented in NRC Inspection Report Number 05000327/2024090 and 05000328/2024090, dated March 19, 2024 [NRC's Agencywide Documents Access and Management System (ADAMS) Accession No. ML24066A197]. The regulatory conference was held at the request of TVA and was characterized as an NRC Observation public meeting. Public participation in the meeting was via teleconference (dial-in). The list of attendees is provided as an enclosure to this summary.
The licensee and their representatives presented a summary of their interpretation of the conditions and factors resulting in the failure of the Sequoyah 1B Emergency Diesel Generator on September 19, 2023. While the licensee and the NRC share a common understanding of the facts associated with the event, the licensee does not agree with the agency interpretation and characterization of their meaning as captured within the finding and AV. In the March 19th inspection report, the agency preliminarily determined that improper restoration during a January 2023 maintenance outage of the rear exhaust valve bridge adjuster locknut and screw at engine 1B2, cylinder 14, caused separation and misposition leading to excessive global lash and valve failure. TVA and their representatives utilized the enclosed slide deck to provide an alternative qualitative analysis of the causal factors (ML24117A035). The licensee determined that an unpreventable internal spring failure in the outboard valve bridge assembly caused excessive local lash, which led to the subsequent loss of the outboard rear exhaust valve retaining ring.
While members of the public were invited there were apparent challenges with the Teams interface when time was permitted for them to provide their input. Members of the public were asked to provide their questions, comments, or concerns via the meeting feedback mechanism that can be found attached to the meeting notice on the public website or in ADAMS (ML24108A064). Following these interactions, the meeting was adjourned.
No feedback responses were submitted as of the date of this Regulatory Conference meeting summary.
In accordance with 10 CFR 2.390 of the NRCs Agency Rules of Practice and Procedure, a copy of this conference summary and enclosures (Enclosure 1 and 2) will be made available electronically for public inspection in the NRC Public Document room or in ADAMS, accessible from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html.
Enclosures:
- 1. Attendance List
cc w/ encl: Distribution via LISTSERV
ML24136A224 X Non-Sensitive X Publicly Available X SUNSI Review Sensitive Non-Publicly Available
OFFICE RII/DRP RII/EICS RII/DRP NAME S. Ninh J. Rivera Ortiz L. McKown
DATE 5/15/2024 5/15/2024 5/15/2024 Attendance List
Regulatory Conference Tennessee Valley Authority (TVA) - Sequoyah Nuclear Plant
May 2, 2024 U.S. NRC Region II Conference Center
Region II Office Microsoft Teams Microsoft Teams (In-person) (audio and video) (dial-in, last 4 phone only)
Participant AffiliationParticipant AffiliationParticipant Affiliation Mark Miller NRC Laura Dudes NRC 6972 Public Russell Felts NRC Peter Meier NRC 9007 Public Mike Franovich NRC Dan Bradley NRC 1234 Public Mark Franke NRC Michael Magyar NRC 7512 Public Louis McKown NRC Michelle KichlineNRC 9584 Public Mark Kowal NRC Kimberly Green NRC 1585 Public Dave Hardage NRC Theodore Fanelli NRC 0508 Public Alex Price NRC John Honcharik NRC 9005 Public Jeff Hamman NRC Christopher Even NRC 6180 Public Shane Sandal NRC Lauren Bryson NRC 6454 Public Andy Rosebrook NRC John Bozga NRC 6174 Public Joel Rivera OrtizNRC Michael Swim NRC 9239 Public Sarah Price NRC Ryan Taylor NRC 0084 Public Wesley NRC Katie McCurry NRC 7780 Public Deschaine Tom Marshall TVA Antonios Zoulis NRC 9001 Public Matt Rasmussen TVA Alex Garmoe NRC 7957 Public Beth Jenkins TVA Dariusz Szwarc NRC 9050 Public James Hodge TVA Shilp Vasavada NRC 0259 Public John Tuite TVA Omar Khan NRC 5492 Public Rick Medina TVA Delza Parent NRC 8210 Public Brad Basham TVA Rich Smith NRC 2562 Public Gary Thompson MPR LaDonna Suggs NRC 9239 Public Frank Hope Jensen Jasmine Smith NRC Hughes