ML24032A020

NPDES Biocide/Corrosion Treatment Plan Annual Report, Cy 2023

ML24032A020
Person / Time
Site:	Sequoyah
Issue date:	01/31/2024
From:	Markum T Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
TN0026450
Download: ML24032A020 (1)

Text

Tennessee Valley Authority, Sequoyah Nuclear Plant, P.O. Box 2000, Soddy Daisy, TN 37384 January 31, 2024 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Subject:

Sequoyah Nuclear Plant, NPDES Biocide/Corrosion Treatment Plan Annual Report, CY 2023 Attached is the NPDES Biocide/Corrosion Treatment Plan Annual Report for 2023 for Sequoyah Nuclear Plant.

Respectfully, Travis R. Markum Environmental Scientist

1 Markum, Travis R From:

Markum, Travis R Sent:

Wednesday, January 31, 2024 3:46 PM To:

Water Permits; Sarah Terpstra Cc:

'Michael Bascom'; Pierson, Callan

Subject:

TN0026450 SQN BCTP Annual Report 2023 Attachments:

TN0026450 SQN BCTP Annual Report 2023.pdf See aached Biocide/Corrosion Treatment Plan annual report for 2023 for Sequoyah Nuclear Plant. An electronic copy will also be aached to next DMR submial for Ouall 101.

Travis R. Markum Env. Scientist (Compliance)

Environmental Operations TVA Sequoyah Nuclear Plant PO Box 2000, OPS 5N Soddy Daisy, TN 37384

423-843-6714

trmarkum@tva.gov NOTICE: This electronic message transmission contains information that may be TVA SENSITIVE, TVA RESTRICTED, or TVA CONFIDENTIAL. Any misuse or unauthorized disclosure can result in both civil and criminal penalties. If you are not the intended recipient, be aware that any disclosure, copying, distribution, or use of the content of this information is prohibited. If you have received this communication in error, please notify me immediately by email and delete the original message.

TN0026450 SQN Duration in Hours (hrs/day)

Month Maximum*

Maximum Average Limit Maximum Average Limit Days of Treatment (based on days in service)

January 24.0 417 299 2275 0.0291 0.0286 0.2 18 February 24.0 417 299 2275 0.0297 0.0293 0.2 13 March 24.0 417 323 2275 0.0296 0.0294 0.2 12 April 24.0 417 300 2275 0.0296 0.0285 0.2 15 May 24.0 418 296 2275 0.0287 0.0285 0.2 19 June 24.0 418 271 2275 0.0291 0.0282 0.2 22 July 19.3 329 235 2275 0.0310 0.0286 0.2 16 August 19.6 335 268 2275 0.0309 0.0282 0.2 22 September 19.4 333 259 2275 0.0285 0.0281 0.2 14 October 19.1 327 222 2275 0.0288 0.0277 0.2 16 November 2275 0.2 December 2275 0.2 Jan. - Dec.

24.0 418 2275 0.0310 0.2 167

• Maximum treatment duration is listed individually per system: ERCW A, ERCW, B and RCW.

NOTE: Injection durations were estimated between 5/4/23 to 7/20/23 due to data lost during personnel transition.

Per Part III.E of the NPDES permit: "WET testing shall be performed twice per year at Outfall 101: once per year when oxidizing biocides are being used, and once per year when non-oxidizing biocides are being used."

(mg/L) 2023 Biocide/Corrosion Treatment Plan Annual Report Flogard MS6236 Quantity in Pounds Analytical Results (mass balance calculations)

(lbs/day)

TN0026450 SQN Duration in Hours (hrs/day)

Month Maximum*

Maximum Average Limit Maximum Average Limit Days of Treatment (based on days in service)

January 0.3 19 16 50 0.0480 0.0474 2.0 7

February 0.3 19 12 50 0.0480 0.0474 2.0 7

March 1.3 47 28 50 0.0840 0.0624 2.0 5

April 0.5 33 19 50 0.0840 0.0648 2.0 8

May 0.5 29 24 50 0.0470 0.0466 2.0 11 June 0.5 29 24 50 0.0480 0.0464 2.0 15 July 0.5 29 19 50 0.0510 0.0470 2.0 12 August 0.5 16 12 50 0.0470 0.0461 2.0 14 September 0.5 19 14 50 0.0470 0.0461 2.0 13 October 0.5 29 20 50 0.0470 0.0460 2.0 8

November 0.3 19 19 50 0.0460 0.0457 2.0 3

December 0.3 19 17 50 0.0480 0.0467 2.0 3

Jan. - Dec.

1.3 47 50 0.0840 2.0 106

• Maximum treatment duration is listed individually per system: ERCW A, ERCW, B and RCW.

NOTE: Injection durations were estimated between 5/4/23 to 7/20/23 due to data lost during personnel transition.

(lbs/day)

(mg/L)

Per the B/CTP approval: Spectrus BD1500 is a surfactant that is injected into the ERCW and RCW systems for approximately 30 minutes prior initiating chlorination to enhance the effectiveness of the chlorination.

2023 Biocide/Corrosion Treatment Plan Annual Report Spectrus BD 1500 Quantity in Pounds Analytical Results mass balance calculations

TN0026450 SQN Duration in Hours (hrs/day)

Month Maximum*

Maximum Average Limit Maximum Average Limit Days of Treatment (based on days in service)

January 855 0.05 February 15.7 347 266 855 0.0369 0.0368 0.05 4

March 855 0.05 April 855 0.05 May 15.5 341 268 855 0.0364 0.0362 0.05 6

June 7.5 166 166 855 0.0364 0.0364 0.05 1

July 15.0 330 264 855 0.0373 0.0351 0.05 4

August 15.0 302 242 855 0.0326 0.0326 0.05 2

September 24.0 483 289 855 0.0328 0.0325 0.05 10 October 24.0 483 284 855 0.0323 0.0321 0.05 6

November 855 0.05 December 14.0 280 240 855 0.0338 0.0336 0.05 4

Jan. - Dec.

24.0 483 855 0.0373 0.05 37 Outfall 101: Toxicity was sampled September 10-15, 2023 during Spectrus CT 1300 treatment Test Results: Pimephales promelas: IC25 >100%

Ceriodaphnia dubia: IC25 > 100%

Outfall 110: There has been no discharge from Outfall 110 January - December 2023.

• Maximum treatment duration is listed individually per system: ERCW A, ERCW, B and RCW.

Per Part III.E of the NPDES permit: "WET testing shall be performed twice per year at Outfall 101: once per year when oxidizing biocides are being used, and once per year when non-oxidizing biocides are being used."

2023 Biocide/Corrosion Treatment Plan Annual Report (lbs/day)

(mg/L)

Quantity in Pounds Analytical Results mass balance calculations Spectrus CT1300

TN0026450 SQN Duration in Hours (hrs/day)

Month Maximum*

Maximum Average Limit Maximum Average Limit Days of Treatment (based on days in service)

(see Note) (see Note) (daily max)

January 4.0 150 150 1425

<0.05

<0.05 0.047 9

February 4.0 150 117 1425

<0.05

<0.05 0.047 9

March 4.0 150 123 1425

<0.05

<0.05 0.047 11 April 4.0 150 93 1425

<0.05

<0.05 0.047 14 May 4.0 150 129 1425

<0.05

<0.05 0.047 14 June 4.0 150 120 1425

<0.05

<0.05 0.047 22 July 4.0 215 132 1425

<0.05

<0.05 0.047 19 August 4.0 225 206 1425

<0.05

<0.05 0.047 22 September 4.0 225 182 1425

<0.05

<0.05 0.047 19 October 4.0 225 163 1425

<0.05

<0.05 0.047 16 November 4.0 150 150 1425

<0.05

<0.05 0.047 13 December 4.0 150 142 1425

<0.05

<0.05 0.047 6

Jan. - Dec.

4.0 225 1425

<0.05 0.047 174 Outfall 101: Toxicity was sampled July 11-18, 2023 during Towerbrom 960 treatment.

Test Results: Pimephales promelas: IC25 >100%

Ceriodaphnia dubia: IC25 > 100%

Outfall 110: There has been no discharge from Outfall 110 January - December 2023.

• Maximum treatment duration is listed individually per system: ERCW A, ERCW, B and RCW.

NOTE: Per Part I.3.b.3) of the NPDES permit effective August 1, 2020: "The method detection level (MDL) for TRC shall not exceed 0.05 mg/L unless the permittee demonstrates that its MDL is higher."

Per Part III.E of the NPDES permit: "WET testing shall be performed twice per year at Outfall 101: once per year when oxidizing biocides are being used, and once per year when non-oxidizing biocides are being used."

2023 Biocide/Corrosion Treatment Plan Annual Report Towerbrom 960 Quantity in Pounds Analytical Results mass balance calculation (mg/L)

(lbs/day)