ML25349B312
| ML25349B312 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/15/2025 |
| From: | Micheal K Tennessee Valley Authority |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| Download: ML25349B312 (0) | |
Text
Sequoyah Nuclear Plant, P.O. Box 2000, Soddy Daisy, Tennessee 37384 December 15, 2025 10 CFR 50.4 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-001 Sequoyah Nuclear Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-77 and DPR-79 NRC Docket Nos. 50-327 and 50-328
Subject:
Annual Non-Radiological Environmental Operating Report - 2025 The purpose of this letter is to submit the enclosed Sequoyah Nuclear Plant (SQN) 2025 Annual Non-Radiological Environmental Operating Report. The Tennessee Valley Authority is submitting this report in accordance with Section 5.4.1 of Appendix B, Environmental Technical Specifications (Non-Radiological), of the SQN, Units 1 and 2, Renewed Operating Licenses.
This report, which addresses the period from October 1, 2024, through September 30, 2025, is required to be submitted within 90 days following each anniversary of issuance of the operating licenses. Issuance dates for the SQN, Units 1 and 2, Operating Licenses were September 17, 1980, and September 15, 1981, respectively, indicating this report is to be submitted no later than December 15, 2025.
There are no new regulatory commitments in this letter. Please direct questions concerning this report to Rick Medina, Site Regulatory Compliance Manager, at (423) 843-8129 or rmedina4@tva.gov.
Respectfully, Kevin Micheal Site Vice President Sequoyah Nuclear Plant
Enclosure:
Tennessee Valley Authority - Sequoyah Nuclear Plant Annual Non-Radiological Environmental Operating Report, October 1, 2024, through September 30, 2025 cc: See page 2
U.S. Nuclear Regulatory Commission Page 2 December 15, 2025 cc (Enclosure):
NRC Regional Administrator - Region II NRC Senior Resident Inspector - SQN NRR Project Manager - SQN Division of Radiological Health - State of Tennessee
ENCLOSURE Tennessee Valley Authority Sequoyah Nuclear Plant Annual Non-Radiological Environmental Operating Report October 1, 2024, through September 30, 2025
TABLE OF CONTENTS I.
INTRODUCTION............................................................................................................... 2 II.
REPORTING FOR THOSE PROGRAMS NOT CONCERNED WITH WATER QUALITY OR PROTECTION OF AQUATIC BIOTA, WHICH ARE REGULATED BY THE CLEAN WATER ACT...................................................................................................................... 2 III.
ENVIRONMENTAL MONITORING PERFORMED........................................................... 3 IV.
REPORTS PREVIOUSLY SUBMITTED AS SPECIFIED IN THE SQN NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) PERMIT......................... 4 V.
ENVIRONMENTAL TECHNICAL SPECIFICATION (ETS) NONCOMPLIANCES............. 5 VI.
CHANGES MADE TO APPLICABLE STATE AND FEDERAL PERMIT CERTIFICATIONS
.......................................................................................................................................... 5 VII.
CHANGES IN FACILITY DESIGN OR OPERATION........................................................ 5 VIII.
NON-ROUTINE REPORTS............................................................................................... 6 IX.
SPECIAL STUDIES........................................................................................................... 6 X.
CHANGES IN APPROVED ENVIRONMENTAL TECHNICAL SPECIFICATION.............. 6
2 I.
INTRODUCTION The Sequoyah Nuclear Plant (SQN) Annual Non-Radiological Environmental Operating Report for the period of October 1, 2024, through September 30, 2025, has been prepared in accordance with Environmental Technical Specifications (ETS) (Non-Radiological), Appendix B, Section 5.4.1. This report includes a summary of:
A.
Reporting for those programs not concerned with water quality or protection of aquatic biota, which are regulated by the Clean Water Act B.
Environmental monitoring performed C. Reports previously submitted as specified in the SQN National Pollutant Discharge Elimination System (NPDES) Permit No. TN0026450 D. ETS non-compliances and the corrective actions for remediation E.
Changes made to applicable State and Federal permits and certifications F.
Changes in station design that could involve a significant environmental impact or change the findings of the Final Environmental Statement (FES)
G. Non-routine reports submitted per ETS Section 4.1 H. Special studies I.
Changes in approved ETS Reporting, monitoring, and inspections conducted as required by permits and regulations indicated no adverse impacts upon the environment as a result of station operation.
II.
REPORTING FOR THOSE PROGRAMS NOT CONCERNED WITH WATER QUALITY OR PROTECTION OF AQUATIC BIOTA, WHICH ARE REGULATED BY THE CLEAN WATER ACT A.
Third Quarter 2024 Summary of Asbestos Removal Projects - submitted to the Hamilton County Air Pollution Control Bureau on October 7, 2024 B.
Annual Asbestos Removal Notification - submitted to Hamilton County Air Pollution Control Bureau on November 18, 2024 C. Fourth Quarter 2024 Summary of Asbestos Removal Projects - submitted to the Hamilton County Air Pollution Control Bureau on January 7, 2025 D. Semi-Annual Auxiliary Boiler Fuel Report - submitted to the Hamilton County Air Pollution Control Bureau on January 7, 2025 E.
Annual Construction and Demolition (C&D) Landfill Report - submitted electronically (via email) to Tennessee Department of Environment and Conservation (TDEC) on January 27, 2025 F.
Tier Two Emergency and Hazardous Chemical Inventory - submitted to Soddy-Daisy Fire Department, Hamilton County Local Emergency Planning Commission, and the Tennessee Emergency Management Agency (electronically) on February 25, 2025 G. Annual Hazardous Waste Activity Report for 2024 - submitted to the Tennessee Department of Environment and Conservation on February 25, 2025 H. Sequoyah Nuclear Plant Hazardous Waste Minimization Plan - maintained on file at Sequoyah Nuclear Plant since February 25, 2025
3 I.
First Quarter 2025 Summary of Asbestos Removal Projects - submitted to the Hamilton County Air Pollution Control Bureau on April 9, 2025.
J.
Sequoyah Nuclear Plant Annual Report on the Hours of Operation for diesel permitted equipment - submitted to the Hamilton County Air Pollution Control Bureau (electronically) on May 12, 2025 K.
Forms A and R Toxic Chemical Release Information CY2024 Required by Emergency Planning and Community Right to Know Act (EPCRA) - submitted to the Environmental Protection Agency (EPA) EPCRA Reporting Center and Tennessee Department of Environment and Conservation (electronically) on June 25, 2025 L.
Second Quarter 2025 Summary of Asbestos Removal Projects - submitted to the Hamilton County Air Pollution Control Bureau on July 7, 2025 M. Semi-Annual Auxiliary Boiler Fuel Report - submitted to the Hamilton County Air Pollution Control Bureau on July 7, 2025 III.
ENVIRONMENTAL MONITORING PERFORMED A.
Storm water samples collected at required frequencies and Best Management Practices implemented as required by General Industrial Storm Water Discharge Permit TNR050015 B.
Semi-annual facility inspections as required by General Industrial Storm Water Discharge Permit TNR050015 C. Outfall sampling and inspection is performed as required by NPDES Permit TN0026450 (results previously submitted to NRC as required)
D. Monthly erosion and sediment control inspections are conducted as required by General Industrial Storm Water Discharge Permit TNR050015 E.
Weekly tank, piping, and secondary containment inspections are performed as required by General Industrial Storm Water Discharge Permit TNR050015 and the Spill Prevention Controls and Countermeasure Plan F.
Weekly hazardous waste inspections conducted as required by 40 CFR 262 and by the Tennessee Rule Chapter 0400-12-01, Hazardous Waste Program G. Weekly landfill inspections performed as required by 40 CFR 258 and by the Tennessee Rule Chapter 0400-11-01, Solid Waste Processing and Disposal H. Monthly operational hours of Auxiliary Boilers A and B, Emergency Diesel Generators 1A, 1B, 2A, and 2B, Emergency Flex Generator Engines 3A and 3B as required by Federally Enforceable Certificate of Operation Nos. 4150-10200501-08C and 4150-20200102-11C I.
Monthly operational hours of Auxiliary Boilers A and B, Emergency Diesel Generators 1A, 1B, 2A, and 2B, Emergency Flex Generator Engines 3A and 3B, High Pressure Diesel Fire Pump, Security Backup Diesel Generator, I/S Diesel Generator, 225 KV Diesel Generators, and Communications Backup Diesel Generators as required by 40 CFR 63 J.
Intake fore-bay aeration system sampling, maintenance, and operation performed as required by the State of Tennessee
4 K.
Air emissions inspected monthly for equipment permitted by the Hamilton County Air Pollution Control Bureau L.
Refrigeration equipment performance and repairs are tracked monthly to ensure compliance with Title VI of the Clean Air Act M. Waste sampling and characterization as required by 40 CFR 261 N. Asbestos removal tracking as required by the Hamilton County Air Pollution Control Bureau O. Hazardous waste minimization (such as chemical control and substitution) as required by the Tennessee Rule Chapter 0400-12-01, Hazardous Waste Program P.
National Environmental Policy Act (NEPA) reviews conducted to evaluate potential environmental impact of temporary or permanent facility modifications as required by 40 CFR 1500 Q. Miscellaneous Media Reviews IV.
REPORTS PREVIOUSLY SUBMITTED AS SPECIFIED IN THE SQN NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) PERMIT The following reports were submitted as specified in the SQN NPDES Permit No. TN0026450 and General Industrial Discharge Storm Water Permit No. TNR050015.
A.
Monthly Discharge Monitoring Report (DMR) for September 2024 with semiannual Biomonitoring Report - submitted to Tennessee Department of Environment and Conservation on October 12, 2024.
B.
Monthly Discharge Monitoring Report for October 2024 - submitted to Tennessee Department of Environment and Conservation on November 14, 2024.
C. Monthly Discharge Monitoring Report for November 2024 - submitted to Tennessee Department of Environment and Conservation on December 12, 2024.
D. Monthly Discharge Monitoring Report for December 2024 - submitted to Tennessee Department of Environment and Conservation on January 15, 2025.
E.
2024 Biocide/Corrosion Treatment Plan (B/CTP) Annual Report - submitted to Tennessee Department of Environment and Conservation on January 31, 2025.
F.
Monthly Discharge Monitoring Report for January 2025 - submitted to Tennessee Department of Environment and Conservation on February 13, 2025.
G. 2024 Water Withdrawal Registration Forms - submitted to Tennessee Department of Environment and Conservation on February 12, 2025.
H. Monthly Discharge Monitoring Report for February 2025 - submitted to Tennessee Department of Environment and Conservation on March 13, 2025.
I.
Monthly Discharge Monitoring Report for March 2025 - submitted to Tennessee Department of Environment and Conservation on April 14, 2025.
J.
Monthly Discharge Monitoring Report for April 2025 - submitted to Tennessee Department of Environment and Conservation on May 14, 2025.
K.
Monthly Discharge Monitoring Report for May 2025 - submitted to Tennessee Department of Environment and Conservation on June 12, 2025.
5 L.
2025 Annual Stormwater Monitoring Report submitted to the Tennessee Department of Environment and Conservation on July 2, 2025.
M. Monthly Discharge Monitoring Report for June 2025 with Biomonitoring Report -
submitted to Tennessee Department of Environment and Conservation on July 14, 2025.
N. Monthly Discharge Monitoring Report for July 2025 - submitted to Tennessee Department of Environment and Conservation on August 14, 2025.
O. Monthly Discharge Monitoring Report for August 2025 - submitted to Tennessee Department of Environment and Conservation on September 15, 2025.
V.
ENVIRONMENTAL TECHNICAL SPECIFICATION (ETS) NONCOMPLIANCES None.
VI.
CHANGES MADE TO APPLICABLE STATE AND FEDERAL PERMIT CERTIFICATIONS None.
VII.
CHANGES IN FACILITY DESIGN OR OPERATION In accordance with ETS 5.3.C, facility design and operational changes were reviewed for potential effect on the environment. These reviews are completed per Tennessee Valley Authority Instruction IX Environmental Review in compliance with the National Environmental Policy Act and with TVAs Environmental Management System (EMS) procedure.
A.
Tests and Experiments There were no tests or experiments conducted during this period that had an unreviewed environmental question of significant impact.
B.
Design and Operational Changes The facility design and operational changes made during this reporting period with a potential impact on the environment were found to be within the scope of existing permits and in compliance with environmental regulations. Those changes reviewed are as follows:
Environmental Assessments None.
6 Categorical Exclusion Checklists (CEC)
CEC 54216 Proposed Amertap projects at SQN include condenser tube cleaning system replacement and condenser tube cleaning system Amertap replacement (Tertiary). The Amertap system is a passive, continuous condenser tube cleaning system used on Units 1 and 2 to continuously remove fouling and scaling and prevent the deposit of materials.
The systems were installed in the 1970s and debris filters installed in the 1990s.
Currently, components to these systems are obsolete and cannot be maintained, leading to performance and reliability concerns. Upgrades include installation or replacement of:
HE/TI Modification Kits, Differential Pressure Measuring System, Ball Collectors, and Digital Control System Components.
CEC 54063 Project proposes to refurbish the Sequoyah Moisture Separator Re-Heaters (MSRs) with the MSR upgrade kit designed and fabricated by TEI. The upgrade kit includes replacing the MSR internals to include new distribution headers, perforation plates, advanced double pocket chevrons, and floor drain configurations. Installation of the upgrade kit will require side access to the MSR via a new shell side manway.
CEC 53407 This project would replace roofs at SQN including the Training Center Annex Building, Paint/Sandblast Shop, and the Old Steam Generator Storage Building Roof.
CEC 53342 TVA proposes to install the following at the SQN 500kV switchyard: new switch house, B-set distance relay on the East Cleveland terminal and spare breaker 998, breaker failure relay for breaker 964, 8 new motor operated switches, 6 voltage transformers on bus 1-3 and 2-2, 3 potential transformers, tertiary reactor, station service transformer, cable tray inside the plant, and cable trenches for conduit in the yard. TVA will replace existing 161kV motor operated breaker isolation switches, associated jumpers, and common station service transformer D and retire capacitor bank 1 and 2, capacitor bank breakers 1004 and 1008, and all associated switches, bus work, relays, and controls.
TVA will convert both pilot relaying schemes from permissive over-reaching transfer trip to directional comparison blocking for the SQN-Hiwassee 500kV TL and the SQN-Watts Bar NP 500kV TL, replace Digital Protection Units and convert to IP Transport at SQN and Watts Bar NP 500kV Switchyards and Hiwassee, TN 500kV Substation.
VIII.
NON-ROUTINE REPORTS None.
IX.
SPECIAL STUDIES None.
X.
CHANGES IN APPROVED ENVIRONMENTAL TECHNICAL SPECIFICATION There were no changes in approved ETSs during this period.