ML24011A320

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Submittal of Discharge Monitoring Report (Dmr), December 2023
ML24011A320
Person / Time
Site: Sequoyah  Tennessee Valley Authority icon.png
Issue date: 01/11/2024
From: Markum T
Tennessee Valley Authority
To:
Office of Nuclear Reactor Regulation
Shared Package
ML24011A315 List:
References
Download: ML24011A320 (1)
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Text

Tennessee Valley Authority, Sequoyah Nuclear Plant, P.O. Box 2000, Soddy Daisy, TN 37384

January 11, 2024

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Subject:

Sequoyah Nuclear Plant, Discharge Monitoring Report (DMR), December 2023

Attached is the December 2023 DMR for Sequoyah Nuclear Plant.

Respectfully,

Travis R. Markum Environmental Scientist

DMR Copy of Record

Permit Permit #: TN0026450 Permittee: Tennessee Valley Authority (TVA) Facility: TVA SEQUOYAH NUCLEAR PLANT (SQN)

Major: Yes Permittee Address: 1101 Market Street, BR 2C Facility Location: SEQUOYAH ACCESS ROAD Chattanoga, TN 37402 SODDY DAISY SODDY DAISY, TN 37379

Permitted Feature: 101 Discharge: 101-G External Outfall Monthly reporting for Outfall 101 (& 101 Emergency Spillway)- Diffuser Pond Report Dates & Status Monitoring Period: From 12/01/23 to 12/31/23 DMR Due Date: 01/15/24 Status: NetDMR Validated Considerations for Form Completion If a limit violation or NODI code is reported, explain in comments. If no discharge, report NODI C. If value is below detection limit, report NODI B and include detection limit in comments. For PCBs, report NODI 9 if monitoring was not conducted, and notify Division when data is reported so DMRs can be modified.

Principal Executive Officer First Name: Thomas

Title:

Vice President Telephone: 423-843-7001 Last Name: Marshall No Data Indicator (NODI)

Form NODI: --

Parameter Monitoring LocationSeason Param. Quantity or Loading Quality or Concentration # ofFrequency of Analysis Sample Type Code Name Qualifier#NODIValue 1 QualifierValue 2 Units Qualifier Value 1 QualifierValueQualifier Value 3 Units Ex.

1 2 1 2 2 3

Sample = 28.3 04 -deg C99/99 - Continuous RC - Recorder(auto) 00010 Temperature, water deg. centigrade 1 - Effluent Gross 0 -- Permit Req. Req Mon DAILY MX 04 -deg C 99/99 - Continuous RC - Recorder(auto)

Value NODI

Sample = 15.2 04 -deg C99/99 - Continuous CA - CALCTD 00010 Temperature, water deg. centigrade Z - Instream Permit Monitoring 0 -- Req. <= 30.5 DAILY MX 04 -deg C 99/99 - Continuous CA - CALCTD Value NODI

Sample = 2.4 04 -deg C99/99 - Continuous CA - CALCTD 00016 Temp. diff. between samp. & upstrm deg. C 1 - Effluent Gross 2 -- Permit Req. <= 5.0 DAILY MX 04 -deg C 99/99 - Continuous CA - CALCTD Value NODI Sample Permit 01/EP - Once Every 39516 Polychlorinated biphenyls [PCBs] 1 - Effluent Gross 0 -- Req. <= 0.0 DAILY MX 20 -ppmPermit Cycle GR - GRAB

Value NODI 9 - Conditional Monitoring - NotRequired This Period

Sample = 1765.4 = 1800.3 03 - MGD 99/99 - Continuous RC - Recorder(auto) 50050 Flow, in conduit or thru treatment plant 1 - Effluent Gross 0 -- Permit Req. Req Mon MOAVG Req MonDAILY MX 03 - MGD 99/99 - Continuous RC - Recorder(auto)

Value NODI Sample Permit 50060 Chlorine, total residual 1 - Effluent Gross 0 -- Req. <= 0.027 MO AVG <= 0.047 DAILY MX 19 -mg/L 01/07 - Weekly GR - GRAB Value NODI B - Below Detection Limit/No Detection B - Below Detection Limit/No Detection

Sample = 0.2 62 - degC/hr 99/99 - Continuous CA - CALCTD 82234 Temperature rate of change deg. C/hr Z - Instream Permit Monitoring 0 -- Req. <= 2.0 DAILY MX 62 - degC/hr 99/99 - Continuous CA - CALCTD Value NODI Sample Permit T7P3B IC25 Sub-Lethal Static Renewal 7 Day Chronic Req. > 69.0 MINIMUM 23 - % 01/30 - Monthly CP - COMPOS Ceriodaphnia dubia 1 - Effluent Gross 0 -- Value

NODI 9 - Conditional Monitoring - NotRequired This Period

Sample Permit T7P6C IC25 Sub-Lethal Static Renewal 7 Day Chronic 1 - Effluent Gross 0 -- Req. > 69.0 MINIMUM 23 - % 01/30 - Monthly CP - COMPOS Pimephales promelas Value NODI 9 - Conditional Monitoring - NotRequired This Period

Submission Note If a parameter row does not contain any values for the Sample nor Effluent Trading, then none of the following fields will be submitted for that row: Units, Number of Excursions, Frequency of Analysis, and Sample Type.

Edit Check Errors No errors.

Comments Method Detection Limit for Total Residual Chlorine is 0.05 mg/L.

Attachments No attachments.

Report Last Saved By Tennessee Valley Authority (TVA)

User: TRMARKUM Name: Travis Markum E-Mail: trmarkum@tva.gov Date/Time: 2024-01-10 14:53 (Time Zone: -06:00)

Report Last Signed By User: TMCMUTUA Name: Tony McMutuary E-Mail: tmcmutuary@tva.gov Date/Time: 2024-01-11 06:54 (Time Zone: -06:00)

DMR Copy of Record

Permit Permit #: TN0026450 Permittee: Tennessee Valley Authority (TVA) Facility: TVA SEQUOYAH NUCLEAR PLANT (SQN)

Major: Yes Permittee Address: 1101 Market Street, BR 2C Facility Location: SEQUOYAH ACCESS ROAD Chattanoga, TN 37402 SODDY DAISY SODDY DAISY, TN 37379

Permitted Feature: 103 Discharge: 103-G Internal Outfall Monthly reporting for IMP 103-Low Volume Waste Treatment Pond Report Dates & Status Monitoring Period: From 12/01/23 to 12/31/23 DMR Due Date: 01/15/24 Status: NetDMR Validated Considerations for Form Completion All parameters require data entry. If a limit violation or NODI code is reported, explain in comments. If value is below detection limit, report NODI B and include detection limit in comments.

Principal Executive Officer First Name: Thomas

Title:

Vice President Telephone: 423-843-7001 Last Name: Marshall No Data Indicator (NODI)

Form NODI: --

Parameter Monitoring Location Season # Param. NODI Quantity or Loading Quality or Concentration # of Ex. Frequency of Analysis Sample Type Code Name Qualifier 1 Value 1 Qualifier 2 Value 2 Units Qualifier 1 Value 1 Qualifier 2Value 2Qualifier 3 Value 3 Units Sample = 6.8 = 6.8 12 - SU01/30 - Monthly GR - GRAB 00400 pH IM - Internal Monitoring Point 0 -- Permit Req. >= 6.0 MINIMUM <= 9.0 MAXIMUM 12 - SU 01/30 - Monthly GR - GRAB

Value NODI

Sample = 2.9 = 2.9 19 - mg/L01/30 - Monthly GR - GRAB 00530 Solids, total suspended IM - Internal Monitoring Point 0 -- Permit Req. <= 30.0 MO AVG <= 100.0 DAILY MX 19 - mg/L 01/30 - Monthly GR - GRAB

Value NODI

Sample < 4.8 < 4.8 19 - mg/L01/30 - Monthly GR - GRAB 00552 Oil and grease, hexane extr method IM - Internal Monitoring Point 0 -- Permit Req. <= 15.0 MO AVG <= 20.0 DAILY MX 19 - mg/L 01/30 - Monthly GR - GRAB Value NODI

Sample = 1.487 = 1.487 03 - MGD 01/30 - Monthly IN - INSTAN 50050 Flow, in conduit or thru treatment plant IM - Internal Monitoring Point 0 -- Permit Req. Req Mon MO AVG Req Mon DAILY MX 03 - MGD 01/30 - Monthly IN - INSTAN

Value NODI Submission Note If a parameter row does not contain any values for the Sample nor Effluent Trading, then none of the following fields will be submitted for that row: Units, Number of Excursions, Frequency of Analysis, and Sample Type.

Edit Check Errors No errors.

Comments See Attachment 1 regarding a sewage overflow event to the Turbine Building Sump that occurred during the reporting period.

Attachments

Name Type Size

SQN_December_2023_IMP103_DMR_Attachment_1.pdf pdf 79895.0 Report Last Saved By Tennessee Valley Authority (TVA)

User: TRMARKUM Name: Travis Markum E-Mail: trmarkum@tva.gov Date/Time: 2024-01-10 14:59 (Time Zone: -06:00)

Report Last Signed By User: TMCMUTUA Name: Tony McMutuary E-Mail: tmcmutuary@tva.gov Date/Time: 2024-01-11 06:54 (Time Zone: -06:00)

Attachment 1 TVA Sequoyah Plant NPDES Permit TN0026450

Description and Duration of Event

On December 6, 20 23 at approximately 1400, SQN plant operations received notification that grey water was leaking out of the Turbine Building sewage holding tank onto the Turbine Building floor, which drains to the Turbine Building Sump (TBS). The TBS flows to the Low Volume Wastewater Treatment Pond (IMP 103) and from there to the Diffuser Pond, which discharges through Outfall 101 to the Tennessee River. Cleanup efforts began as soon as practicable when the leak was isolated.

Earlier that morning, a hold order was established to facilitate maintenance on the sewage ejector pump resulting in the ejector being unavailable. The cause of the overflow was determined to be due not all inflows to the sewage holding tank being isolated prior to the hold order on the ejector pump being issued. This ultimately caused the sewage tank to overflow. A small berm surrounding the sewage tank was able to contain the initial overflow. However, the clearance was lifted and all the inputs were returned to the sewage holding tank prior to the pump being started, which caused the containment berm overflow int o the sump.

At no time was there any threat to public drinking supplies, human health, or the environment

Actions Taken to Mitigate Reoccurrence

SQN has documented the event in the TVA Corrective Action Program and is in the process of determining corrective actions to reduce or prevent recurrence. Condition Report (CR) 1896675 has been written to develop corrective actions to help prevent reoccurrence.

DMR Copy of Record

Permit Permit #: TN0026450 Permittee: Tennessee Valley Authority (TVA) Facility: TVA SEQUOYAH NUCLEAR PLANT (SQN)

Major: Yes Permittee Address: 1101 Market Street, BR 2C Facility Location: SEQUOYAH ACCESS ROAD Chattanoga, TN 37402 SODDY DAISY SODDY DAISY, TN 37379

Permitted Feature: 107 Discharge: 107-G Internal Outfall Monthly reporting for IMP 107-Metal Cleaning Waste Ponds Report Dates & Status Monitoring Period: From 12/01/23 to 12/31/23 DMR Due Date: 01/15/24 Status: NetDMR Validated Considerations for Form Completion All parameters require data entry. If a limit violation or NODI code is reported, explain in comments. If value is below detection limit, report NODI B and include detection limit in comments. If routine decanting of stormwater, report NODI 9.

Principal Executive Officer First Name: Thomas

Title:

Vice President Telephone: 423-843-7001 Last Name: Marshall No Data Indicator (NODI)

Form NODI: --

Parameter Monitoring Location Season # Param. NODI Quantity or Loading Quality or Concentration # of Ex. Frequency of Analysis Sample Type Code Name Qualifier 1Value 1Qualifier 2Value 2UnitsQualifier 1 Value 1 Qualifier 2Value 2Qualifier 3 Value 3 Units Sample 00400 pH IM - Internal Monitoring Point 0 -- Permit Req. >= 6.0 MINIMUM <= 9.0 MAXIMUM 12 - SU 01/01 - Daily GR - GRAB

Value NODI C - No Discharge C - No Discharge

Sample 00530 Solids, total suspended IM - Internal Monitoring Point 0 -- Permit Req. <= 30.0 MO AVG <= 100.0 DAILY MX 19 - mg/L 01/01 - Daily CP - COMPOS

Value NODI C - No Discharge C - No Discharge

Sample 00552 Oil and grease, hexane extr method IM - Internal Monitoring Point 0 -- Permit Req. <= 15.0 MO AVG <= 20.0 DAILY MX 19 - mg/L 01/01 - Daily GR - GRAB Value NODI C - No Discharge C - No Discharge

Sample 01042 Copper, total [as Cu] IM - Internal Monitoring Point 0 -- Permit Req. <= 1.0 MO AVG <= 1.0 DAILY MX 19 - mg/L 01/01 - Daily CP - COMPOS

Value NODI C - No Discharge C - No Discharge

Sample 01045 Iron, total [as Fe] IM - Internal Monitoring Point 0 -- Permit Req. <= 1.0 MO AVG <= 1.0 DAILY MX 19 - mg/L 01/01 - Daily CP - COMPOS

Value NODI C - No Discharge C - No Discharge

Submission Note If a parameter row does not contain any values for the Sample nor Effluent Trading, then none of the following fields will be submitted for that row: Units, Number of Excursions, Frequency of Analysis, and Sample Type.

Edit Check Errors No errors.

Comments

Attachments No attachments.

Report Last Saved By Tennessee Valley Authority (TVA)

User: TRMARKUM Name: Travis Markum E-Mail: trmarkum@tva.gov Date/Time: 2024-01-10 15:00 (Time Zone: -06:00)

Report Last Signed By User: TMCMUTUA Name: Tony McMutuary E-Mail: tmcmutuary@tva.gov Date/Time: 2024-01-11 06:54 (Time Zone: -06:00)

DMR Copy of Record

Permit Permit #: TN0026450 Permittee: Tennessee Valley Authority (TVA) Facility: TVA SEQUOYAH NUCLEAR PLANT (SQN)

Major: Yes Permittee Address: 1101 Market Street, BR 2C Facility Location: SEQUOYAH ACCESS ROAD Chattanoga, TN 37402 SODDY DAISY SODDY DAISY, TN 37379

Permitted Feature: 110 Discharge: 110-G External Outfall Monthly Reporting for Outfall 110 Report Dates & Status Monitoring Period: From 12/01/23 to 12/31/23 DMR Due Date: 01/15/24 Status: NetDMR Validated Considerations for Form Completion All parameters require data entry. If outfall is inactive, report NODI C. If a limit violation or NODI code is reported, explain in comments. If value is below detection limit, report NODI B and include detection limit in comments.

Principal Executive Officer First Name: Thomas

Title:

Vice President Telephone: 423-843-7001 Last Name: Marshall No Data Indicator (NODI)

Form NODI: --

Parameter Monitoring Location Season Param. Quantity or Loading Quality or Concentration # ofFrequency of Analysis Sample Type Code Name Qualifier#NODIValue 1 QualifierValue 2 Units QualifierValue 1 QualifierValueQualifier Value 3 Units Ex.

1 2 1 2 2 3 Sample Permit 04 - deg 00010 Temperature, water deg. centigrade 1 - Effluent Gross 0 -- Req. Req Mon DAILYMXC 99/99 - Continuous RC - Recorder(auto)

Value NODI C - NoDischarge

Sample Permit 00010 Temperature, water deg. centigrade Z - Instream Req. <= 30.5 DAILY MX 04 - degC 99/99 - Continuous CA - CALCTD Monitoring 0 -- Value

NODI C - NoDischarge

Sample Permit 00016 Temp. diff. between samp. & upstrm deg. C 1 - Effluent Gross 2 -- Req. <= 5.0 DAILY MX 04 - degC 99/99 - Continuous CA - CALCTD

Value NODI C - NoDischarge

Sample Permit 39516 Polychlorinated biphenyls [PCBs] 1 - Effluent Gross 0 -- Req. <= 0.0 DAILY MX 20 - ppm 01/EP - Once Every PermitCycle GR - GRAB

Value NODI C - NoDischarge

Sample Permit 50050 Flow, in conduit or thru treatment plant 1 - Effluent Gross 0 -- Req. Req Mon MO AVG Req Mon DAILYMX 03 - MGD 99/99 - Continuous RC - Recorder(auto)

Value NODI C - NoDischarge C - NoDischarge

Sample Permit 50060 Chlorine, total residual 1 - Effluent Gross 0 -- Req. <= 0.027 MO AVG <= 0.047 DAILY MX 19 - mg/L 01/07 - Weekly GR - GRAB

Value NODI C - NoDischarge C - NoDischarge

Sample Permit 82234 Temperature rate of change deg. C/hr Z - Instream Req. <= 2.0 DAILY MX 62 - degC/hr 99/99 - Continuous CA - CALCTD Monitoring 0 -- Value NODI C - NoDischarge

Sample Permit T7P3B IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia Req. > 69.0 MINIMUM 23 - % 01/30 - Monthly CP - COMPOS dubia 1 - Effluent Gross 0 -- Value NODI C - NoDischarge

Sample Permit Req. > 69.0 MINIMUM 23 - % 01/30 - Monthly CP - COMPOS T7P6C IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephalespromelas 1 - Effluent Gross 0 --

Value C - No NODI Discharge

Submission Note If a parameter row does not contain any values for the Sample nor Effluent Trading, then none of the following fields will be submitted for that row: Units, Number of Excursions, Frequency of Analysis, and Sample Type.

Edit Check Errors No errors.

Comments

Attachments No attachments.

Report Last Saved By Tennessee Valley Authority (TVA)

User: TRMARKUM Name: Travis Markum E-Mail: trmarkum@tva.gov Date/Time: 2024-01-10 15:01 (Time Zone: -06:00)

Report Last Signed By User: TMCMUTUA Name: Tony McMutuary E-Mail: tmcmutuary@tva.gov Date/Time: 2024-01-11 06:54 (Time Zone: -06:00)

DMR Copy of Record

Permit Permit #: TN0026450 Permittee: Tennessee Valley Authority (TVA) Facility: TVA SEQUOYAH NUCLEAR PLANT (SQN)

Major: Yes Permittee Address: 1101 Market Street, BR 2C Facility Location: SEQUOYAH ACCESS ROAD Chattanoga, TN 37402 SODDY DAISY SODDY DAISY, TN 37379

Permitted Feature: 118 Discharge: 118-G External Outfall Monthly Reporting for Internal Outfall 118 Report Dates & Status Monitoring Period: From 12/01/23 to 12/31/23 DMR Due Date: 01/15/24 Status: NetDMR Validated Considerations for Form Completion All parameters require data entry. If pond is not in service, report NODI 9. If a limit violation or NODI code is reported, explain in comments. If value is below detection limit, report NODI B and include detection limit in comments.

Principal Executive Officer First Name: Thomas

Title:

Vice President Telephone: 423-843-7001 Last Name: Marshall No Data Indicator (NODI)

Form NODI: --

Parameter Monitoring Location Season #Param. NODI Quantity or Loading Quality or Concentration # of Ex. Frequency of Analysis Sample Type Code Name Qualifier 1 Value 1 Qualifier 2 Value 2 Units Qualifier 1 Value 1 Qualifier 2Value 2Qualifier 3 Value 3 Units Sample 00300 Oxygen, dissolved [DO] 1 - Effluent Gross 0 -- Permit Req. >= 2.0 MINIMUM 19 - mg/L 02/07 - Twice Every Week GR - GRAB

Value NODI C - No Discharge

Sample 00530 Solids, total suspended 1 - Effluent Gross 0 -- Permit Req. <= 100.0 DAILY MX 19 - mg/L 02/07 - Twice Every Week GR - GRAB

Value NODI C - No Discharge

Sample 00545 Solids, settleable 1 - Effluent Gross 0 -- Permit Req. <= 1.0 DAILY MX 25 - mL/L 01/30 - Monthly GR - GRAB Value NODI C - No Discharge

Sample 50050 Flow, in conduit or thru treatment plant 1 - Effluent Gross 0 -- Permit Req. Req Mon MO AVG Req Mon DAILY MX 03 - MGD 01/BA - Once Per Batch ES - ESTIMA

Value NODI C - No Discharge C - No Discharge Submission Note If a parameter row does not contain any values for the Sample nor Effluent Trading, then none of the following fields will be submitted for that row: Units, Number of Excursions, Frequency of Analysis, and Sample Type.

Edit Check Errors No errors.

Comments

Attachments No attachments.

Report Last Saved By Tennessee Valley Authority (TVA)

User: TRMARKUM Name: Travis Markum E-Mail: trmarkum@tva.gov Date/Time: 2024-01-10 15:02 (Time Zone: -06:00)

Report Last Signed By User: TMCMUTUA Name: Tony McMutuary E-Mail: tmcmutuary@tva.gov Date/Time: 2024-01-11 06:54 (Time Zone: -06:00)

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