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Category:Letter
MONTHYEARIR 05000259/20240032024-11-0404 November 2024 Integrated Inspection Report 05000259/2024003 and 05000260/2024003 and 05000296/2024003 CNL-24-043, Application for Subsequent Renewed Operating Licenses, Second Safety Supplement2024-11-0101 November 2024 Application for Subsequent Renewed Operating Licenses, Second Safety Supplement ML24305A1692024-10-31031 October 2024 Site Emergency Plan Implementing Procedure Revision 05000259/LER-2024-003, Valid Specified System Actuation Caused the Automatic Start of Emergency Diesel Generators2024-10-29029 October 2024 Valid Specified System Actuation Caused the Automatic Start of Emergency Diesel Generators 05000259/LER-2024-001-02, Secondary Containment Isolation Valve Inoperable Due to Mechanical Failure2024-10-28028 October 2024 Secondary Containment Isolation Valve Inoperable Due to Mechanical Failure ML24299A2632024-10-25025 October 2024 Response to Apparent Violation in NRC Inspection Report 05000260/2024090, EA-24-075 ML24289A1232024-10-24024 October 2024 Letter to James Barstow Re Environmental Scoping Summary Report for Browns Ferry CNL-24-074, Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2024-10-23023 October 2024 Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure Revisions ML24308A0042024-10-16016 October 2024 Ahc 24-1578 Environmental Review of the Browns Ferry Nuclear Plant, Units 1, 2 and 3 Subsequent License Renewal Application Limestone County CNL-24-077, Application for Subsequent Renewed Operating Licenses, Response to Request for Additional Information, Set 12024-10-0909 October 2024 Application for Subsequent Renewed Operating Licenses, Response to Request for Additional Information, Set 1 ML24270A2162024-09-27027 September 2024 Notice of Intentions Regarding Preliminary Finding from NRC Inspection Report 05000260/2024090, EA-24-075 CNL-24-060, Supplement to Request for Approval of the Tennessee Valley Authority Nuclear Quality Assurance Program Description2024-09-24024 September 2024 Supplement to Request for Approval of the Tennessee Valley Authority Nuclear Quality Assurance Program Description ML24262A1502024-09-24024 September 2024 Requalification Program Inspection - Browns Ferry Nuclear Plant ML24262A0602024-09-23023 September 2024 Summary of August 19, 2024, Meeting with Tennessee Valley Authority Regarding a Proposed Supplement to the Tennessee Valley Authority Nuclear Quality Assurance Plan ML24263A2952024-09-19019 September 2024 Site Emergency Plan Implementing Procedure Revision CNL-24-065, Tennessee Valley Authority – Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2024-09-18018 September 2024 Tennessee Valley Authority – Central Emergency Control Center Emergency Plan Implementing Procedure Revisions IR 05000260/20240902024-09-17017 September 2024 NRC Inspection Report 05000260/2024090 and Preliminary White Finding and Apparent Violation - 1 CNL-24-062, Cycle 16 Reload Analysis Report2024-09-16016 September 2024 Cycle 16 Reload Analysis Report ML24255A8862024-09-10010 September 2024 Core Operating Limits Report for Cycle 16 Operation, Revision 0 ML24239A3332024-09-0303 September 2024 Full Audit Plan IR 05000259/20244042024-09-0303 September 2024 Cyber Security Inspection Report 05000259/2024404 and 05000260-2024404 and 05000296/2024404-Cover Letter IR 05000259/20240052024-08-26026 August 2024 Updated Inspection Plan for Browns Ferry Nuclear Plant, Units 1, 2 and 3 - Report 05000259/2024005, 05000260/2024005 and 05000296/2024005 ML24225A1682024-08-16016 August 2024 – Notification of Inspection and Request IR 05000259/20244022024-08-0606 August 2024 Security Baseline Inspection Report 05000259/2024402 and 05000260/2024402 and 05000296/2024402 ML24219A0272024-08-0606 August 2024 Response to NRC Regulatory Issue Summary 2024-01, Preparation and Scheduling of Operator Licensing Examinations IR 05000259/20240022024-08-0202 August 2024 Brown Ferry Nuclear Plant – Integrated Inspection Report05000259/2024002 and 05000260/2024002 and 05000296/2024002 ML24199A0012024-07-22022 July 2024 Clarification and Correction to Exemption from Requirement of 10 CFR 37.11(c)(2) ML24172A1342024-07-15015 July 2024 Exemptions from 10 CFR 37.11(C)(2) (EPID L-2023-LLE-0024) - Letter ML24183A4142024-07-10010 July 2024 – License Renewal Regulatory Limited Scope Audit Regarding the Environmental Review of the License Renewal Application (EPID Number: L-2024-SLE-0000) (Docket Numbers: 50-259, 50-260, and 50-296) 05000296/LER-2024-003, Main Steam Relief Valves Lift Settings Outside of Technical Specifications Required Setpoints2024-07-0808 July 2024 Main Steam Relief Valves Lift Settings Outside of Technical Specifications Required Setpoints 05000259/LER-2024-001-01, Inoperability of Unit 3 Diesel Generator Due to Relay Failure2024-07-0303 July 2024 Inoperability of Unit 3 Diesel Generator Due to Relay Failure ML24184A1142024-07-0202 July 2024 Site Emergency Plan Implementing Procedure Revision ML24183A3842024-07-0101 July 2024 Registration of Use of Cask to Store Spent Fuel (MPC-364, -365) ML24179A0282024-06-26026 June 2024 Evaluation of Effects of Out-of-Limits Condition as Described in IWB-3720(a) 05000259/LER-2024-002, Reactor Scram Due to Generator Step-Up Transformer Failure2024-06-24024 June 2024 Reactor Scram Due to Generator Step-Up Transformer Failure ML24175A0042024-06-23023 June 2024 Interim Report of a Deviation or Failure to Comply Associated with a Valve in the Unit 3 High Pressure Coolant Injection System ML24176A1132024-06-23023 June 2024 American Society of Mechanical Engineers, Section XI, Fourth 10 Year Inspection Interval, Inservice Inspection, System Pressure Test, Containment Inspection, and Repair and Replacement Programs, Owner’S Activity Report Cycle 21 Oper ML24089A1152024-06-21021 June 2024 Transmittal Letter, Environmental Assessments and Findings of No Significant Impact Related to Exemption Requests from 10 CFR 37.11(c)(2) ML24155A0042024-06-18018 June 2024 Proposed Alternative to the Requirements of the ASME Code (Revised Alternative Request 0-ISI-47) ML24158A5312024-06-0606 June 2024 Registration of Use of Cask to Store Spent Fuel (MPC-361, -362, -363) ML24071A0292024-06-0505 June 2024 Subsequent License Renewal Application Enclosure 3 - Proprietary Determination Letter ML24068A2612024-06-0505 June 2024 SLRA Fluence Methodology Report - Proprietary Determination Letter IR 05000259/20244032024-05-22022 May 2024 – Security Baseline Report 05000259/2024403 and 05000260/2024403 and 05000296/2024403 05000260/LER-2024-002, High Pressure Coolant Injection Inoperable Due to Rupture Disc Failure and Resulting System Isolation2024-05-20020 May 2024 High Pressure Coolant Injection Inoperable Due to Rupture Disc Failure and Resulting System Isolation ML24141A0482024-05-17017 May 2024 EN 56958_1 Ametek Solidstate Controls, Inc ML24136A0702024-05-15015 May 2024 2023 Annual Radiological Environmental Operating Report IR 05000259/20240012024-05-14014 May 2024 Integrated Inspection Report 05000259/2024001, 05000260/2024001, and 05000296/2024001 CNL-24-040, Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2024-05-0808 May 2024 Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure Revisions ML24123A2012024-05-0202 May 2024 NRC Cybersecurity Baseline Inspection (NRC Inspection Report 05000259/2024404, 05000260-2024404, 05000296/2024404) and Request for Information ML24122A6852024-05-0101 May 2024 2023 Annual Radioactive Effluent Release Report and Offsite Dose Calculation Manual 2024-09-03
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TENNESSEE VALLEY 1\\14 AUTHORITY
Post Office Box 2000, Decatur, Alabama 35609-2000
November 21, 2023 10 CFR 50.4
ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001
Browns Ferry Nuclear Plant, Units 1 and 3 Renewed Facility Operating License Nos. DPR-33 and DPR-68 NRC Docket Nos. 50-259 and 50-296
Subject:
Tennessee Valley Authority (TVA) - Browns Ferry Nuclear Plant Anchor Darling Double Disc Gate Valve Commitment Revision
Reference:
- 1. TVA letter to NRC, Tennessee Valley Authority (TVA) - Browns Ferry Nuclear Plant Anchor Darling Double Disc Gate Valve Commitment Revision, dated January 11, 2018 (ML18016A032).
- 2. TVA letter to NRC, Tennessee Valley Authority - Anchor Darling Double Disc Gate Valve Information and Status, dated December 28, 2017 (ML17362A566).
In the Reference letter dated December 28, 2017, TVA provided a listing of the Anchor Darling double disc gate valve (ADDDGV) population with active safety functions along with relevant valve information, including the results of susceptibility evaluations and repair status, for the Browns Ferry Nuclear Plant, Units 1, 2, and 3; and the Sequoyah Nuclear Plant, Units 1 and 2.
The Reference letter also confirmed that Watts Bar Nuclear Plant (WBN), Units 1 and 2, does not use ADDDGVs to support any active safety function.
The purpose of this letter is to provide updated commitments regarding the BFN Units 1 and 3 ADDDGV motor-operated valves that are categorized as Susceptible and Not Repaired.
On November 25, 2019, the Boiling Water Reactor Owners Group (BWROG) issued Topical Report TP16-1-112, Revision 5, Recommendations to Resolve Flowserve 10 CFR Part 21 Notification Affecting Anchor Darling Double Disc Gate Valve Wedge Pin Failures, which provided updated guidance for crediting thread friction between the stem and upper wedge, including the threshold friction values at which proactive repair is no longer recommended.
Specifically, Attachment 10 of TP16-1-112 provides the BWROG Valve Technical Resolution Group (VTRG) recommended actions for susceptible motor-operated valves (MOVs). The first option was to repair the valves and eliminate the condition. The second option was to reanalyze the wedge pin using a stem to upper wedge thread coefficient of friction (COF) of 0.2 or less to acquire positive wedge pin margin. If positive margin exists, then repair is not required. The MOV is then to be diagnostically tested at the following maximum intervals:
U.S. Nuclear Regulatory Commission Page 2 November 21, 2023
2 years, for tests 1 and 2.
4 years, for tests 3 and 4.
At the established GL 96-05 periodic verification / Appendix Ill in-service test interval for all future tests, if no active stem-wedge connection degradation is identified (i.e., an unsatisfactory stem rotation check and/or unresolved diagnostic test anomalies).
This testing will include stem rotation checks. BFN has reviewed the wedge pin margins and has determined that positive margin exists for the subject valves with the use of a stem to upper wedge thread COF of 0.2. Therefore, this condition has been met. Further support for cancelling the repair work on the subject valves was provided by the positive results of the inspections of the original stems following repair work performed on 2-FCV-068-0003, 2-FCV-068-0079 and 3-FCV-068-0079. The original stems from these va lves were cut through the wedge pin centerline to determine if there was any indication of wedge pin shear, but no such indications were identified.
TVA, based on continued evaluation, has determined that the periodic monitoring of these valves is feasible, and is revising the BFN commitments to repair them. The Enclosure to this letter reflects the revised commitments for BFN Units 1 and 3 for the ADDDGV issue. These commitments supersede the unimplemented portions of Commitments 1 and 3 in the Enclosure to the first Reference letter. TVA may further modify these commitments should additional technical information or repair methods become available to justify such action.
Should you have any questions concerning this submittal, please contact David Renn, Site Licensing Manager, at (256) 729-2636.
Respectfully,
Manu Sivaraman Site Vice President
Enclosure:
Summary of Commitments
cc (Enclosure):
NRR Director - NRC Headquarters NRC Regional Administrator - Region II NRC Project Manager - Browns Ferry Nuclear Plant NRC Senior Resident Inspector - Browns Ferry Nuclear Plant
Enclosure
Summary of Commitments
- 1. 1-FCV-068-0003 and 1-FCV-068-0079 will undergo Stem Rotation Checks and Diagnostic Testing in accordance with BWROG Topical Report TP16-1-112, Revision 5, Attachment 10, Option 2 beginning no later than Fall 2024 refueling outage.
1-FCV-075-0009 was repaired on October 22, 2022, under Work Order 119334041.
1-FCV-075-0037 was repaired on October 21, 2020, under Work Order 119334042.
- 2. 3-FCV-068-0003 will undergo Stem Rotation Checks and Diagnostic Testing in accordance with BWROG Topical Report TP16-1-112, Revision 5, Attachment 10, Option 2 beginning no later than the Spring 2024 refueling outage.
3-FCV-068-0079 was repaired on March 15, 2022, under Work Order 119334055.