TXX-2501, Submittal of 2024 Annual Environmental Operating Report (Non-Radiological)

Submittal of 2024 Annual Environmental Operating Report (Non-Radiological)

ML25114A081
Person / Time
Site:	Comanche Peak
Issue date:	04/24/2025
From:	Hicks J Luminant Generation Co, Vistra Corp
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
TXX-25019, CP-202500112
Download: ML25114A081 (1)

Text

CP-202500112 TXX-25019 April 24, 2025 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

Subject:

Comanche Peak Nuclear Power Plant (CPNPP)

Docket Nos. 50-445 and 50-446 Comanche Peak Nuclear Power Plant Jack C. Hicks Senior Manager, Fleet Licensing P.O. Box 1002 6322 North FM 56 Glen Rose, TX 76043 Office: 254.897.6725 Ref CPNPPEPP 2024 Annual Environmental Operating Report (Non-Radiological)

Dear Sir or Madam:

Vistra Operations Company LLC (Vistra OpCo) hereby submits the Comanche Peak Nuclear Power Plant (CPNPP) 2024 Annual Environmental Operating Report (Non-Radiological). The enclosed report is provided pursuant to Appendix B to the CPNPP Units 1 and 2 Facility Operating License Nos. NPF-87 & NPF-89 (Environmental Protection Plan). The report covers the period from January 1, 2024 to December 31, 2024.

This letter contains no new regulatory commitments for CPNPP Unit 1 and Unit 2.

If you have any questions regarding this submittal, please contact Kassie Mandrell at (254) 897-6987 or Kassie.Mandrell@luminant.com.

Sincerely,

Enclosure:

CPNPP 2024 Annual Environmental Operating Report (Non-Radiological) cc (email):

John Monninger, Region IV Uohn.Monninger@nrc.gov]

Dennis Galvin, NRR [Dennis.Galvin@nrc.gov]

John Ellegood, Senior Resident Inspector, CPNPP Uohn.Ellegood@nrc.gov]

Henry Strittmatter, Resident Inspector, CPNPP [Henry.Strittmatter@nrc.gov]

6555 SIERRA DR IVE IRVING. TEXAS 75039 o 214-812-4600 VISTRACORPCOM

1 VISTRA OPERATIONS COMPANY, LLC COMANCHE PEAK NUCLEAR POWER PLANT UNITS 1 & 2 2024 ANNUAL ENVIRONMENTAL OPERATING REPORT (NON-RADIOLOGICAL)

FACILITY OPERATING LICENSE NOs. NPF-87 & 89

2 I.

INTRODUCTION This report describes the implementation of the Environmental Protection Plan (EPP) for the calendar year 2024 as required by Appendix B to Facility Operating License Nos. NPF-87 & 89 for Comanche Peak Nuclear Power Plant (CPNPP) for Units 1 & 2.

During 2024, the CPNPP Non-Radiological Environmental Monitoring Program was effective in implementing and monitoring all CPNPP environmental regulatory commitments. Program effectiveness in 2024 was substantiated by both Environmental Services (ES) - Corporate audits and Texas Commission on Environmental Quality (TCEQ) inspections concerning the CPNPP Environmental program.

II. SCOPE Section 5.4.1 of the EPP requires that CPNPP submit to the NRC an Annual Environmental Operating Report that shall address the following environmental protection activities:

A.

Summaries and analyses of the results of the environmental protection activities required by Section 4.2 of the EPP, including a comparison with related preoperational studies, operational controls (as appropriate), and previous non-radiological environmental monitoring reports, and an assessment of the observed impacts of plant operation on the environment. If harmful effects or evidence of trends toward irreversible damage to the environment are observed, a detailed analysis of the data and a proposed course of mitigating actions are required. Section 4.2 of the EPP pertains to results from:

1.

Groundwater levels and station water use monitoring.

2.

Water treatment facility outages impact assessment and reporting.

B.

The report shall also include:

1.

A list of EPP non-compliances and the associated corrective actions.

2.

A list of all changes in station design and operation, tests, and experiments made in accordance with Subsection 3.1 of the EPP which involved a potentially significant unreviewed environmental question.

3.

A list of non-routine reports submitted in accordance with Subsection 5.4.2 of the EPP.

4.

A summary list of Texas Pollutant Discharge Elimination System (TPDES) permit related reports relative to matters identified in Subsection 2.1 of the EPP which were submitted to the Texas Commission on Environmental Quality (TCEQ) during the report period.

Subsection 2.1 of the EPP pertains to aquatic matters that are addressed by the effluent limitations, and the monitoring requirements contained in the TCEQ TPDES station wastewater discharge permit.

3 III.

RESULTS OF ACTIVITIES A.

As required by Subsection 4.2 of the EPP, the following are summaries and analyses of the environmental protection activities during 2024. Based on the results of these activities, there were no observed adverse environmental impacts resulting from plant operation during 2024.

1.

Groundwater Pumpage As indicated in Table 2, groundwater pumpage during 2024 averaged 0.059 gals /min.

(gpm) or 31200 total gallons withdrawn for the year. CPNPP continues to be supplied by Somervell County Water District (SCWD) which started in January 2012. Groundwater withdrawal dropped to <1 gpm after Somervell County Water District (SCWD) became our supplier.

Groundwater withdrawn during 2024 was used primarily for potable and sanitary purposes. No groundwater was used to supplement the stations Surface Water Treatment System.

The average annual pumpage rate of 0.06 gpm for 2024 represents <1% of the predicted operational pumpage (127 gpm) identified in Section 3.3 of the Stations Environmental Report - Operational License Stage. This rate also represents approximately 0.1 % of the actual average withdrawal rate (158 gpm) reported in the Stations Final Environmental Statement - Operating License Stage (Section 5.3.1.2) for the period 1975 to May 1979.

2.

Groundwater Levels As indicated in Table 1, the groundwater level in the on-site observation well OB-3 (intersection of Highway 56 and the Plant Access Road) fluctuated during 2024 from a low level in January of 616.28 ft. Mean Sea Level (MSL) to a high level in June of 619.63 MSL. Overall, the water level in OB-3 during the reporting period (January through December) increases 1.43 ft = 0.44 m. 2024 annual average groundwater levels in wells OB-3 and OB-4 were 618.00 ft. MSL and 552.22 ft. MSL respectively.

4

3.

Surface Water Treatment System Operation The stations Water Treatment System processed 184.5 MGD of surface water during 2024 for plant process use. No outages in 2024 that required reporting in accordance with Section 4.2.2 of the EPP.

The following is a summary list of monthly surface water usage:

Month MGD Clarified January 14.41 February 14.70 March 16.55 April 15.32 May 15.22 June 14.62 July 14.96 August 16.64 September 14.86 October 18.40 November 14.48 December 14.31 Total annual production 184.5 B.

EPP Noncompliance and Corrective Actions - Subsection 5.4.1(1)

There were no non-compliances with the requirements of the EPP during the reporting period.

C.

Changes in Station Design or Operation, Tests, and Experiments Made in Accordance with Subsection 3.1 Which Involved a Potentially Significant Unreviewed Environmental Question.

There were no changes in station design, operation, tests, or experiments conducted during the reporting period that are reportable under this subsection.

D.

Non-routine Reports Submitted in Accordance with Subsection 5.4.2 None

5 E.

Texas Pollutant Discharge Elimination System (TPDES) Permit-Related Reports Relative to Matters Identified in Subsections 2.1 and 5.4.1

1. Routine monthly electronic Discharge Monitoring Reports (netDMRs) for all wastewater outfalls were submitted to the Texas Commission on Environmental Quality (TCEQ) for each month during 2024 via EPAs netDMR tool Central Data Exchange (CDX)

2. Bio-monitoring (e.g., whole effluent toxicity (WET) testing) was on a semi-annual frequency in 2024 for water flea and annual frequency for fathead minnow. All required test passed satisfactorily.

a. Chronic static renewal survival and reproduction test using water flea (Ceriodaphnia dubia) Method 1002.0.

b. Chronic static renewal 7-day larval survival and growth testing using fathead minnows (Pimephales promelas) Method 1000.0

3. There were no Issue Reports in 2024 with reference to TPDES wastewater discharge permit potential variances.

4. There were five (5) incidental spills in 2024 with none being reportable.

x Petroleum - 2 x

Chemical - 2 x

Sewer - 1

6 TABLE 1 2024

SUMMARY

OF GROUNDWATER LEVELS IN OBSERVATION WELLS ANNUAL GROUNDWATER LEVEL CHANGE FOR 2024:

Well OB-3: 277.85 ft. - 276.42 ft. = 1.43 ft = 0.44 m (increase)

Well OB-4: 301.13 ft. - 304.48 ft. = -3.35 ft. = -1.02 m (decrease)

NOTES:

(1) Depth to water table (ft.)

(2) Water table elevation (ft.) Mean Sea Level (MSL)

WELL OB-3 WELL OB-4 MONTH (G-3)

(G-4)

DEPTH (1)

MSL (2)

DEPTH (1)

MSL (2)

January 277.85 616.28 301.13 546.75 February 277.40 616.73 296.57 551.31 March 276.70 617.43 293.35 554.53 April 275.60 618.53 292.68 555.20 May 274.90 619.23 290.37 557.51 June 274.50 619.63 289.74 558.14 July 275.10 619.03 292.04 555.84 August 275.55 618.58 295.20 552.68 September 276.40 617.73 298.08 549.80 October 276.60 617.53 297.15 550.73 November 276.50 617.63 297.10 550.78 December 276.42 617.71 304.48 543.40 II

7 TABLE 2 ANNUAL PRODUCTION WELL REPORT RECREATION/TRAINING SYSTEM Month Deoember January February March April May June July August September October November Deoember Totals Annual Production Well Report for Recreation/Traiining System Well Reading Monthly Last Day of Well Month Total

,(gallons)

{gallons) 649100 650700 1600 652900 2200 654500 1600 656000 1500 658300 2300 660600 2300 666600 6000 668700 2100 673000 4300 674,600 1600 677000 2400 680300 3300 3300 YEAR 2024 Well Cumulative Gallons Per Total Number Day

,(,gallons)

Day*s!Month Total Days/Year

,(average}

1600 31 31 51.61 3800 29 6-0 75.86 5400 31 91 51.61 6900 30 121 50.00 9200 31 152 74.19 11500 30 182 76.67 17500 31 213 193.55 19600 30 243 70.00 23900 31 274 138.71 25500 31 305 51.61 27900 30 335 80.00 31200 31 366 106.45 31200 3£6, Com plet ed By:

Jimmy Walls Retain Original in the Operations Records Vault REFERENCE USE Monthly GPM 0.036 0.053 0.036 0.035 0.052 0.053 0.134 0.049 0.096 0.036 0.056 0.074 Yearly Cumulative GPM 0.0358 0.0440 0.0412 0.0396 0.0420 0.0439 0.0571 0.0560 0.0606 0.0581 0.0578 0.059*2 0.0592 ENV-31.2-3 Page 1 of1 Rev. 5

8 FIGURES 1.25 0.5 0.25 0

2012 2013 700.00 680.00 660.00 640.00 cto ~

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NOTE Somvervell County Water District (SCWD) supplied potable water started 2012

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