ML25043A074
| ML25043A074 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 02/11/2025 |
| From: | Tony Brown Vistra Operations Company |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-25-021 | |
| Download: ML25043A074 (1) | |
Text
6555 SIERRA DRIVE IRVING, TEXAS 75039 o 214-812-4600 VISTRACORP.COM Davis-Besse Nuclear Power Station Terry J. Brown Site Vice President 5501 N. State Route 2 Oak Harbor, Ohio 43449 L-25-021 February 11, 2025 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001 Davis-Besse Nuclear Power Station, Unit No. 1 Docket No. 50-346, License No. NPF-3 Response to Request for Confirmatory Information Regarding the 1R23 Steam Generator Tube Inspection Report By letter dated September 11, 2024 (Accession NO. ML24255A803), Vistra Operations Company LLC (Vistra OpCo) submitted information summarizing the results of steam generator (SG) tube inspections performed during the spring 2024 refueling outage (1R23) at Davis-Besse Nuclear Power Station, Unit No. 1. In email dated January 14, 2025, the NRC requested Vistra OpCo to provide confirmatory information required to complete its review of the SG tube inspection report. This letter provides a response in the attached Response to Request for Confirmatory Information There are no regulatory commitments contained in this submittal. If there are any questions, or if additional information is required, please contact Mr. Jack Hicks, Senior Manager, Licensing, at (254) 897-6725 or Jack.Hicks@luminant.com.
Sincerely, Terry J. Brown
Attachment:
Response to Request for Confirmatory Information cc:
NRC Region III Administrator NRC Resident Inspector NRR Project Manager Utility Radiological Safety Board
Attachment L-25-021 Page 1 of 1 Response to Request for Confirmatory Information INTRODUCTION By letter dated September 11, 2024 (Accession NO. ML24255A803), Vistra Operations Company LLC (Vistra OpCo submitted information summarizing the results of steam generator (SG) tube inspections performed during the spring 2024 refueling outage (1R23) at Davis-Besse Nuclear Power Station, Unit No. 1. In email dated January 14, 2025, the NRC requested Vistra OpCo to provide confirmatory information required to complete its review of the SG tube inspection report. This letter provides a response in the attached Response to Request for Confirmatory Information REQUEST FOR CONFIRMATORY INFORMATION (RCI)
Issue:
Davis-Besse Technical Specification (TS) 5.6.6.e requires reporting of the number of tubes plugged during the inspection outage for each degradation mechanism.
During Davis-Besses 2022 refueling outage (1R22), the licensee detected proximity indications and as a result, plugged 28 tubes (16 in SG 2Aand 12 in SG 1B). The licensee did not report the plugging of these tubes in the SG tube inspection report (ML22272A497), presumably because a proximity indication is not a degradation mechanism. The licensee provided the information regarding the plugged tubes with proximity indications in their response (ML23060A077) to a request for additional information (ML23033A032) from the NRC staff.
In Davis-Besses 1R23 SG tube inspection report (ML24255A803), the licensee reported the total number of plugged tubes in each SG but did not specify the number of preventatively plugged tubes in 1R23. While this non-reporting was compliant with the reporting requirements of TS 5.6.6.e (reporting of the number of tubes plugged during the inspection outage for each degradation mechanism), the NRC staff cannot make assumptions about the number of plugged tubes for non-degradation mechanisms, so the numbers of preventatively plugged tubes should also specifically be reported.
Request:
To complete their review of the SG tube inspections performed during the spring 1R23 at Davis-Besse, as attached to ML24255A803, the NRC staff requests that the licensee confirm whether the following statement is correct:
During 1R23, there were 5 tubes preventively plugged in SG 2A due to proximity indications, and 12 tubes preventively plugged in SG 1B due to proximity indications.
RESPONSE
The licensee confirms the NRC staffs statement During 1R23, there were 5 tubes preventively plugged in SG 2A due to proximity indications, and 12 tubes preventively plugged in SG 1B due to proximity indications is a correct statement.