Text

Annual Radioactive Effluent Release Report
	ML25114A210
Person / Time
Site:	Peach Bottom
Issue date:	04/30/2025
From:	; Constellation Energy Generation
To:	; Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
Shared Package
ML25114A208	List: ML25114A209; ML25114A210;
References
	CCN 25-26
	Download: ML25114A210 (1)
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Peach Bottom Clean Energy Center 2024 Document Number: 67 Unit Numbers 2 and 3 Docket Numbers 50-277 and 50-278 Unit Number 1 Docket Number 50-171 Annual Radioactive Effluent Release Report

Annual Radioactive Effluent Release Report YEAR: 2024 Page 1 of 101 Company: Constellation Energy Generation Plant: Peach Bottom Clean Energy Center TABLE OF CONTENTS LIST OF ACRONYMS AND DEFINITIONS................................................................................ 3 EXECUTIVE

SUMMARY

............................................................................................................ 6 2.1 Comparison to Regulatory Limits.................................................................................... 7 INTRODUCTION........................................................................................................................ 9 3.1 About Nuclear Power...................................................................................................... 9 3.2 About Radiation Dose................................................................................................... 11 3.3 About Dose Calculation................................................................................................ 13 DOSE ASSESSMENT FOR PLANT OPERATIONS................................................................. 15 4.1 Regulatory Limits.......................................................................................................... 15 4.2 Regulatory Limits for Gaseous Effluent Doses:............................................................. 15 4.3 Regulatory Limits for Liquid Effluent Doses................................................................... 16 4.4 40 CFR 190 Regulatory Dose Limits for a Member of the Public.................................. 17 4.5 Onsite Doses (Within Site Boundary)............................................................................ 17 SUPPLEMENTAL INFORMATION........................................................................................... 17 5.1 Gaseous Batch Releases............................................................................................. 17 5.2 Liquid Batch Releases.................................................................................................. 18 5.3 Abnormal Releases...................................................................................................... 18 5.4 Land Use Census Changes.......................................................................................... 19 5.5 Meteorological Data...................................................................................................... 19 5.6 Effluent Radiation Monitors Out of Service Greater Than 30 Days................................ 19 5.7 Offsite Dose Calculation Manual (ODCM) Changes...................................................... 19 5.8 Process Control Program (PCP) Changes.................................................................... 19 5.9 Radioactive Waste Treatment System Changes........................................................... 19 5.10 Carbon-14.................................................................................................................... 19 5.11 Errata/Corrections to Previous ARERRs....................................................................... 20 5.12 Independent Spent Fuel Storage Installation (ISFSI) Monitoring Program.................... 20 5.13 Other Supplemental Information................................................................................... 20 NEI 07-07 ONSITE RADIOLOGICAL GROUNDWATER MONITORING PROGRAM............... 22 6.1 Voluntary Notification.................................................................................................... 22 BIBLIOGRAPHY...................................................................................................................... 23 TABLES Table 1, Peach Bottom Clean Energy Center Units 2 and 3 Dose Summary......................................... 7 Table 2, Total Annual Offsite-Dose Comparison to 40 CFR 190 Limits for PBCEC................................ 8 Table 3, Gaseous Effluents Summation of All Releases Units 2 and 3................................................. 25 Table 4, Gaseous Effluents - Ground Level Release Batch Mode Units 2 and 3.............................. 26 Table 5, Gaseous Effluents - Ground Level Release Continuous Mode Units 2 and 3...................... 27 Table 6, Gaseous Effluents - Elevated Level Release Batch Mode Units 2 and 3............................. 28 Table 7, Gaseous Effluents - Elevated Level Release Continuous Mode Units 2 and 3...................... 29

Annual Radioactive Effluent Release Report YEAR: 2024 Page 2 of 101 Company: Constellation Energy Generation Plant: Peach Bottom Clean Energy Center TABLE OF CONTENTS Table 8, Liquid Effluents - Summation of All Releases Units 2 and 3.................................................. 30 Table 9, Batch Mode Liquid Effluents Units 2 and 3............................................................................. 31 Table 10, Continuous Mode Liquid Effluents Units 2 and 3.................................................................. 32 Table 11, Resins, Filters, and Evaporator Bottoms Summary for Units 2 and 3................................... 33 Table 12, Dry Active Waste (DAW) Summary for Units 2 and 3........................................................... 34 Table 13, Irradiated Components Summary for Units 2 and 3.............................................................. 35 Table 14, Other Wastes Summary for Units 2 and 3............................................................................ 36 Table 15, Sum of All Low-Level Waste Shipped from Units 2 and 3..................................................... 37 Table 16, Solid Waste Shipped from the Peach Bottom Clean Energy Center..................................... 38 Table 17, Irradiated Fuel Shipments Disposition Peach Bottom Clean Energy Center......................... 38 Table 18, 2024 Classification of Atmospheric Stability......................................................................... 39 Table 19, 2024 Meteorological Sensor Data Recovery........................................................................ 40 FIGURES Figure 1, Pressurized Water Reactor (PWR) [4]..................................................................................... 9 Figure 2, Boiling Water Reactor (BWR) [5]........................................................................................... 10 Figure 3, Sources of Radiation Exposure (NCRP Report No. 160) [6].................................................. 11 Figure 4, Potential exposure pathways to Members of the Public due to Plant Operations [9]............. 13 ATTACHMENTS, ARERR Release Summary Tables (RG-1.21 Tables)................................................... 25, Solid Waste Information................................................................................................ 33, Meteorological Data...................................................................................................... 39

Annual Radioactive Effluent Release Report YEAR: 2024 Page 3 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center LIST OF ACRONYMS AND DEFINITIONS

1.

Alpha Particle (): A charged particle emitted from the nucleus of an atom having a mass and charge equal in magnitude of a helium nucleus.

2.

AREOR: Annual Radiological Environmental Operating Report

3.

ARERR: Annual Radioactive Effluent Release Report

4.

Abnormal Release: is an unplanned or uncontrolled release of licensed radioactive material from the plant. Abnormal releases may be categorized as either batch or continuous depending on the circumstances.

5.

Abnormal Discharge: is an unplanned or uncontrolled release of licensed radioactive material to the unrestricted area. Abnormal discharges may also be categorized as either batch or continuous depending on the circumstances.

6.

BWR: Boiling Water Reactor

7.

CDE: The committed effective dose equivalent (for internal exposures).

8.

cfm: cubic feet per minute

9.

Composite Sample: A series of single collected portions (aliquots) analyzed as one sample. The aliquots making up the sample are collected at time intervals that are very short compared to the composite period.

10.

Control: A sampling station in a location not likely to be affected by plant effluents due to its distance and/or direction from the Plant.

11.

Counting Error: An estimate of the two-sigma uncertainty associated with the sample results based on total counts accumulated.

12.

Critical Receptor: Represents the MEMBER(S) of the Public in the Unrestricted Area who because of the combination of age group and existing local dose exposure pathways has the potential to receive the highest dose.

13.

Curie (Ci): A measure of radioactivity; equal to 3.7 x 1010 disintegrations per second, or 2.22 x 1012 disintegrations per minute.

14.

Direct Radiation Monitoring: The measurement of radiation dose at various distances from the plant is assessed using thermoluminescent dosimeters (TLDs), optically stimulated luminescent dosimeters (OSLDs), and/or pressurized ionization chambers.

15.

Flux: The volumetric or mass discharge per unit cross sectional area of medium per unit of time (solids plus pores); called the Darcian flux when applied to water movement (ANSI/ANS 2.17-2010 (R2016)). [1] [2]

16.

Grab Sample: A single discrete sample drawn at one point in time.

17.

Ground Water: All water in the surface soil, the subsurface soil, or any other subsurface water. Ground water is simply water in the ground regardless of its quality, including saline, brackish, or fresh water. Ground water can be moisture in the ground that is above the regional water table in the unsaturated (or vadose) zone, or ground water can be at and below the water table in the saturated zone (RG 1.21). [3]

18.

Indicator: A sampling location that is potentially affected by plant effluents due to its proximity and/or direction from the plant.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 4 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center

19.

Ingestion Pathway: The ingestion pathway includes milk, fish, drinking water and garden produce. Also sampled (under special circumstances) are other media such as vegetation or animal products when additional information about radionuclides is needed.

20.

ISFSI: Independent Spent Fuel Storage Installation

21.

Lower Limit of Detection (LLD): The smallest concentration of radioactive material in a sample that will yield a net count (above system background) that will be detected with 95% probability with a 5% probability of a false conclusion that a blank observation represents "real" signal.

22.

LUC: Land Use Census

23.

m/s: Meters per second

24.

MDA: Minimum Detectable Activity

25.

MDC: Minimum Detectable Concentration. Essentially synonymous with MDA for the purposes of radiological monitoring.

26.

Mean: The sum of all of the values in a distribution divided by the number of values in the distribution, synonymous with average.

27.

Microcurie (µCi): 3.7 x 104 disintegrations per second, or 2.22 x106 disintegrations per minute.

28.

millirem (mrem): 1/1000 rem; a unit of radiation dose equivalent in tissue.

29.

Milliroentgen (mR): 1/1000 Roentgen; a unit of exposure to X-or gamma radiation.

30.

MWe: Megawatts Electric

31.

MWTh: Megawatts Thermal

32.

N/A: Not Applicable

33.

N/D: Not Detectable

34.

NEI: Nuclear Energy Institute

35.

Nonroutine, planned dischargeAn effluent release from a release point that is not defined in the ODCM but that has been planned, monitored, and discharged in accordance with 10 CFR 20.2001.

36.

NRC: Nuclear Regulatory Commission

37.

ODCM: Offsite Dose Calculation Manual

38.

OSLD: Optically Stimulated Luminescence Dosimeter

39.

Protected Area: A 10 CFR 73 security term is an area encompassed by physical barriers and to which access is controlled for security purposes. The fenced area immediately surrounding the plant and around ISFSI are commonly classified by the licensee as Protected areas. Access to the protected area requires a security badge or escort.

40.

PWR: Pressurized Water Reactor

41.

RCA: Radiation Controlled Area

42.

REC: Radiological Effluent Control

43.

REMP: Radiological Environmental Monitoring Program

44.

RHR: Residual Heat Removal

Annual Radioactive Effluent Release Report YEAR: 2024 Page 5 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center

45.

Restricted Area: A 10 CFR 20 defined term where access to which is limited by the licensee for the purpose of protecting individuals against undue risks from exposure to radiation and radioactive materials.

46.

TEDE: Total Effective Dose Equivalent (TEDE) means the sum of the effective dose equivalent (for external exposures) and the committed effective dose equivalent (for internal exposures).

47.

TLD: Thermoluminescent Dosimeter

48.

TRM: Technical Requirements Manual

49.

TS: Technical Specification

50.

Unrestricted Area: An area, access to which is neither limited nor controlled by the licensee.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 6 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center EXECUTIVE

SUMMARY

Peach Bottom Clean Energy Center (PBCEC) Radiological Effluent Control (REC)

Program was established to limit the quantities of radioactive material that may be released based on calculated radiation doses or dose rates. Dose to Members of the Public due to radioactive materials released from the plant is limited by Technical Specifications,10 CFR 20, and by 40 CFR 190. Operational doses to the public during 2024 were calculated to be within the limits required by regulation and compared to other sources of radiation dose and pose no health hazard. These doses are summarized and compared to the regulatory limits in Section 2.1 Comparison to Regulatory Limits below.

The Annual Radioactive Effluent Release Report (ARERR) is published per REC requirements and provides data related to plant operation, including: quantities of radioactive materials released in liquid and gaseous effluents; radiation doses to members of the public; solid radioactive waste shipped offsite for processing or direct disposal; and other information as required by site licensing documents.

The gaseous effluent dose assessments for locations from the Land Use Census showed that the critical receptor for Peach Bottom Clean Energy Center, due to airborne releases was to the SW sector at 1500 meters. The maximum annual organ dose calculated for this receptor was 1.40E-02 mrem to the infant thyroid. This value represented 4.66E-02% of the 10 CFR 50, Appendix I dose limits of 30 mrem for two units.

The maximum total body and any organ (liver) doses calculated due to radioactive liquid effluents were 5.14E-04 mrem and 5.22E-04 mrem, respectively to the child.

Solid radioactive waste shipped offsite for processing or direct disposal included 3.29E+02 Curies and 5.05E+02 m3, shipped in 33 shipments. There were 0 shipments of Irratiated fuel from the site.

In addition to monitoring radioactive effluents, PBCEC has a Radiological Environmental Monitoring Program (REMP) that monitors for levels of radiation and radioactive materials in the local environment. Data from the REMP is published in the Annual Radiological Environmental Operating Report (AREOR).

Annual Radioactive Effluent Release Report YEAR: 2024 Page 7 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 2.1 Comparison to Regulatory Limits During 2024 all liquid and gaseous radioactive effluents from Peach Bottom Clean Energy Center were well below regulatory limits, as summarized in Table 1 and Table 3.

Table 1, Peach Bottom Clean Energy Center Units 2 and 3 Dose Summary1 Quarter 1 Quarter 2 Quarter 3 Quarter 4 Annual Liquid Effluents Limit 3 mrem 3 mrem 3 mrem 3 mrem 6 mrem Total Body Dose2 6.60E-06 3.05E-06 1.07E-04 3.99E-04 5.14E-04

% Of Limit 2.20E-04 1.02E-04 3.56E-03 1.33E-02 8.57E-03 Limit 10 mrem 10 mrem 10 mrem 10 mrem 20 mrem Maximum Organ Dose3 6.61E-06 4.13E-06 1.17E-04 3.95E-04 5.22E-04

% Of Limit 6.61E-05 4.13E-05 1.17E-03 3.95E-03 2.61E-03 Gaseous Effluents Limit 10 mrad 10 mrad 10 mrad 10 mrad 20 mrad Gamma Air Dose4 5.43E-03 3.48E-03 6.38E-05 1.93E-02 2.83E-02

% Of Limit 5.43E-02 3.48E-02 6.38E-04 1.93E-01 1.41E-01 Limit 20 mrad 20 mrad 20 mrad 20 mrad 40 mrad Beta Air Dose5 3.69E-03 2.36E-03 1.40E-04 1.34E-02 1.96E-02

% Of Limit 1.84E-02 1.18E-02 7.01E-04 6.68E-02 4.89E-02 Limit 5 mrem 5 mrem 5 mrem 5 mrem 10 mrem NG Total Body Dose6 5.25E-03 3.36E-03 6.14E-05 1.87E-02 2.74E-02

% Of Limit 1.05E-01 6.73E-02 1.23E-03 3.74E-01 2.74E-01 Limit 15 mrem 15 mrem 15 mrem 15 mrem 30 mrem NG Skin Dose7 6.82E-03 4.37E-03 1.99E-04 2.46E-02 3.60E-02

% Of Limit 4.55E-02 2.91E-02 1.33E-03 1.64E-01 1.20E-01 Limit 15 mrem 15 mrem 15 mrem 15 mrem 30 mrem Maximum Organ Dose8 2.31E-04 2.93E-04 2.49E-04 1.32E-02 1.40E-02

% Of Limit 1.54E-03 1.95E-03 1.66E-03 8.80E-02 4.66E-02 1 Table 1 demonstrates compliance with 10 CFR Part 50, App. I Limits. C-14 dose is not included in this table but is included in Table 2 doses.

2 Liquid/ Child 3 Liquid Child Liver 4 SW-1500m / All Age Groups 5 SSE 1100m / All Age Groups 6 SW 1500./ All Age Groups 7 SSE 1100m / All Age Groups 8 SW 1500m / Infant Thyroid

Annual Radioactive Effluent Release Report YEAR: 2024 Page 8 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center Table 2, Total Annual Offsite-Dose Comparison to 40 CFR 190 Limits for PBCEC1 Whole Body Thyroid Max Other Organ Gaseous2 2.83E-02 4.13E-02 3.70E-02 Carbon-14 1.72E-02 1.72E-02 8.05E-02 Liquid 5.14E-04 5.06E-04 5.22E-04 Direct Shine 0

0 0

Other Nearby Facilities3 0

0 0

Total Site Dose 4.60E-02 5.90E-02 1.18E-01 Limit 25 mrem 75 mrem 25 mrem

% of Limit 1.84E-01 7.87E-02 4.72E-01 1 Table 2 is a summation of Units to show compliance with 40 CFR Part 190 Limits.

2 Gaseous dose values in this table include organ dose from Noble Gas, Iodine, Tritium, and Particulates.

3 Other fuel cycle sources within 5 miles of the site are considered in this analysis.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 9 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center INTRODUCTION 3.1 About Nuclear Power Commercial nuclear power plants are generally classified as either Boiling Water Reactors (BWRs) or Pressurized Water Reactors (PWRs), based on their design. A BWR includes a single coolant system where water used as reactor coolant boils as it passes through the core and the steam generated is used to turn the turbine generator for power production. A PWR, in contrast, includes two separate water systems: radioactive reactor coolant and a secondary system. Reactor coolant is maintained under high pressure, preventing boiling. The high-pressure coolant is passed through a heat exchanger called a steam generator where the secondary system water is boiled, and the steam is used to turn the turbine generator for power production.

Figure 1, Pressurized Water Reactor (PWR) [4]

Annual Radioactive Effluent Release Report YEAR: 2024 Page 10 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 3.1 (Continued)

Figure 2, Boiling Water Reactor (BWR) [5]

Electricity is generated by a nuclear power plant similarly to the way that electricity is generated at other conventional types of power plants, such as those powered by coal or natural gas. Water is boiled to generate steam; the steam spins a turbine that is attached to a generator and the steam is condensed back into water to be returned to the boiler. What makes nuclear power different from these other types of power plants is that the heat is generated by fission and decay reactions occurring within and around the core containing fissionable uranium (U-235).

Nuclear fission occurs when certain nuclides (primarily U-233, U-235, or Pu-239) absorb a neutron and break into several smaller nuclides (called fission products) as well as producing some additional neutrons.

Fission results in production of radioactive materials including gases and solids that must be contained to prevent release or treated prior to release. These effluents are generally treated by filtration and/or hold-up prior to release. Releases are generally monitored by sampling and by continuously indicating radiation monitors. The effluent release data is used to calculate doses to ensure that doses to the public due to plant operation remains within required limits.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 11 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 3.2 About Radiation Dose Ionizing radiation, including alpha, beta, and gamma radiation from radioactive decay, has enough energy to break chemical bonds in tissues and damages tissue or genetic material. The amount of ionization that will be generated by a given exposure to ionizing radiation is quantified as dose. Radiation dose is generally reported in units of millirem (mrem) in the US.

Figure 3, Sources of Radiation Exposure (NCRP Report No. 160) [6]

Annual Radioactive Effluent Release Report YEAR: 2024 Page 12 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 3.2 (Continued)

The National Council on Radiation Protection (NCRP) has evaluated the population dose for the US and determined that the average individual is exposed to approximately 620 mrem per year [6]. There are many sources for radiation dose, ranging from natural background sources to medical procedures, air travel, and industrial processes. Approximately half (310 mrem) of the average exposure is due to natural sources of radiation including exposure to radon, cosmic radiation, and internal radiation and terrestrial due to naturally occurring radionuclides. The remaining 310 mrem of exposure is due to man-made sources of exposure, with the most significant contributors being medical (48% of total mrem per year) due to radiation used in various types of medical scans and treatments. Of the remaining 2%

of dose, most is due to consumer activities such as air travel, smoking cigarettes, and building materials. A small fraction of this 2% is due to industrial activities including the generation of nuclear power.

Readers that are curious about common sources and effects of radiation dose that they may encounter can find excellent sources of information from the Health Physics Society, including the Radiation Fact Sheets [7], and from the US Nuclear Regulatory Commission website [8].

Annual Radioactive Effluent Release Report YEAR: 2024 Page 13 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 3.3 About Dose Calculation Concentrations of radioactive material in the environment resulting from plant operations are very small and it is not possible to determine doses directly using measured activities of environmental samples. To overcome this, dose calculations based on measured activities of effluent streams are used to model the dose impact for Members of the Public due to plant operation and effluents. There are several mechanisms that can result in dose to a Member of the Public, including: Ingestion of radionuclides in food or water; Inhalation of radionuclides in air; Immersion in a plume of noble gases; and Direct Radiation from the ground, the plant or from an elevated plume.

Figure 4, Potential exposure pathways to Members of the Public due to Plant Operations [9]

Each plant has an Offsite Dose Calculation Manual (ODCM) that specifies the methodology used to obtain the doses in the Dose Assessment section of this report.

The dose assessment methodology in the ODCM is based on NRC Regulatory Guide 1.109 [10] and NUREG-0133 [11]. Doses are calculated by determining what the nuclide concentration will be in air, water, on the ground, or in food products based on plant effluent releases. Release points are continuously monitored to quantify what concentrations of nuclides are being released. For gaseous releases meteorological data is used to determine how much of the released activity will be present at a given location outside of the plant either deposited onto the ground or in gaseous form.

Intake patterns and nuclide bio-concentration factors are used to determine how much activity will be transferred into animal milk or meat. Finally, human ingestion factors and dose factors are used to determine how much activity will be consumed and how much dose the consumer will receive. Inhalation dose is calculated by determining the concentration of nuclides and how much air is breathed by the individual.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 14 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 3.3 (Continued)

For liquid releases, dilution and mixing factors are used to model the environmental concentrations in water. Drinking water pathways are modeled by determining the concentration of nuclides in the water at the point where the drinking water is sourced (e.g., taken from wells, rivers, or lakes). Fish and invertebrate pathways are determined by using concentration at the release point, bioaccumulation factors for the fish or invertebrate and an estimate of the quantity of fish consumed.

Each year a Land Use Census is performed to determine what potential dose pathways currently exist within a five-mile radius around the plant, the area most affected by plant operations. The Annual Land Use Census identifies the locations of vegetable gardens, nearest residences, milk animals and meat animals. The data from the census is used to determine who is likely to be most exposed to radiation dose due to plant operation.

There is significant uncertainty in dose calculation results, due to modeling dispersion of material released and bioaccumulation factors, as well as assumptions associated with consumption and land-use patterns. Even with these sources of uncertainty, the calculations do provide a reasonable estimate of the order of magnitude of the exposure. Conservative assumptions are made in the calculation inputs such as the number of various foods and water consumed, the amount of air inhaled, and the amount of direct radiation exposure from the ground or plume, such that the actual dose received are likely lower than the calculated dose. Even with the built-in conservatism, doses calculated for the maximum exposed individual due to plant operation are a very small fraction of the annual dose that is received due to other sources. The calculated doses due to plant effluents, along with REMP results, serve to provide assurance that radioactive effluents releases are not exceeding safety standards for the environment or people living near the plant.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 15 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center DOSE ASSESSMENT FOR PLANT OPERATIONS 4.1 Regulatory Limits Regulatory limits are detailed in station licensing documents such as the plant Technical Specifications and the Offsite Dose Calculation Manual (ODCM) and the Final Safety Analysis Report and Plant Operating procedures.These documents contain the limits to which PBCEC must adhere. PBCEC drives to maintain the philosophy to keep dose as low as is reasonably achievable (ALARA) and actions are taken to reduce the amount of radiation released to the environment. Liquid and gaseous release data show that the dose from PBCEC is well below the ODCM limits.

The instantaneous concentration of liquid radioactive material released shall be limited to ten times the concentration specified in 10 CFR 20, Appendix B, Table 2, Column 2, for radionuclides other than dissolved or entrained noble gases. For dissolved or entrained noble gases, the total concentration released shall be limited to 2.0 x 10-4 microcuries/ml.

The annual whole body, skin and organ dose was computed using the 2024 source term using the dose calculation methodology provided in the ODCM. The calculated doses due to gaseous effluents are used to demonstrate compliance with offsite dose limits are presented in Table 1, Peach Bottom Clean Energy Center Units 2 and 3 Dose Summary and Table 2, Total Annual Offsite-Dose Comparison to 40 CFR 190 Limits for PBCEC.

4.2 Regulatory Limits for Gaseous Effluent Doses:

1.

Fission and activation gases:

a.

Noble gases dose rate due to radioactive materials released in gaseous effluents from the site to areas at and beyond the site boundary shall be limited to the following:

1)

Less than or equal to 500 mrem/year to the total body

2)

Less than or equal to 3000 mrem/year to the skin

b.

Noble gas air dose due to noble gases released in gaseous effluents from each reactor unit to areas at and beyond the site boundary shall be limited to the following:

1)

Quarterly a)

Less than or equal to 5 mrads gamma b)

Less than or equal to 10 mrads beta

2)

Yearly a)

Less than or equal to 10 mrads gamma b)

Less than or equal to 20 mrads beta

Annual Radioactive Effluent Release Report YEAR: 2024 Page 16 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 4.2 (Continued)

2.

Iodine, tritium, and all radionuclides in particulate form with half-lives greater than 8 days.

a.

The dose rate for iodine-131, iodine-133, tritium, and all radionuclides in particulate form with half-lives greater than 8 days in gaseous effluents released from the site to areas at and beyond the site boundary shall be limited to the following:

1)

Less than or equal to 1500 mrem/yr to any organ

b.

The dose to a MEMBER OF THE PUBLIC from iodine-131, iodine-133, tritium, and all radionuclides in particulate form with half-lives greater than 8 DAYS in gaseous effluents released from each reactor unit to areas at and beyond the site boundary shall be limited to the following:

1)

Quarterly a)

Less than or equal to 7.5 mrem to any organ

2)

Yearly a)

Less than or equal to 15 mrem to any organ 4.3 Regulatory Limits for Liquid Effluent Doses

1.

The dose or dose commitment to a MEMBER OF THE PUBLIC from radioactive materials in liquid effluents released from each reactor unit to unrestricted areas shall be limited to the following:

a.

Quarterly

1)

Less than or equal to 1.5 mrem total body

2)

Less than or equal to 5 mrem critical organ

b.

Yearly

1)

Less than or equal to 3 mrem total body

2)

Less than or equal to 10 mrem critical organ

Annual Radioactive Effluent Release Report YEAR: 2024 Page 17 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 4.4 40 CFR 190 Regulatory Dose Limits for a Member of the Public

1.

Total Dose (40 CFR 190)

a.

The annual (calendar year) dose or dose commitment to any MEMBER OF THE PUBLIC in the unrestricted area due to releases of radioactivity and to radiation from uranium fuel cycle sources shall be limited to the following:

1)

Less than or equal to 25 mrem, Total Body or any Organ except Thyroid.

2)

Less than or equal to 75 mrem, Thyroid.

4.5 Onsite Doses (Within Site Boundary)

A dose assessment was performed for members of the public due to their activities inside the site boundary, per ODCMS 3.10.2.f. The locations where a member of the public would spend a significant amount of time inside the site boundary are two new vehicle checkpoints, approximately 780 feet ENE (Emergency checkpoint) and 910 feet NNE (Warehouse checkpoint) of the PBAPS Unit 2 and Unit 3 reactor building exhaust vents. Assuming continuous occupancy, the calculated total body and skin doses were 2.10E-01 mrem and 2.73E-01 mrem for the Emergency checkpoint and 2.35E-02 mrem and 3.03E-02 mrem for the Warehouse checkpoint, respectively. The noble gas limiting air doses were 2.17E-01 mrad (gamma) and 1.47E-01 mrad (beta) for the Emergency checkpoint and 2.43E-02 mrad (gamma) and 1.63E-02 mrad (beta) for the Warehouse checkpoint. These doses are conservative, as typically vehicles and their drivers are not at the checkpoints 24/7.

The organ dose from the inhalation pathway, not including C-14, is 4.77E-03 mrem for the Emergency checkpoint and 2.67E-04 mrem for the Warehouse checkpoint, both to the infant thyroid.

SUPPLEMENTAL INFORMATION 5.1 Gaseous Batch Releases 5.1.1 PBCEC Units 2 and 3 Units Quarter 1

Quarter 2

Quarter 3

Quarter 4

Annual

1. Number of Batch Releases 0

0 1

2. Total duration of batch releases minutes 0

0 2.69E+03 0

2.69E+03

3. Maximum batch release duration minutes 0

0 2.69E+03 0

2.69E+03

4. Average batch release duration minutes 0

0 2.69E+03 0

2.69E+03

5. Minimum batch release duration minutes 0

0 2.69E+03 0

2.69E+03

Annual Radioactive Effluent Release Report YEAR: 2024 Page 18 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 5.2 Liquid Batch Releases 5.2.1 PBCEC Units 2 and 3 Units Quarter 1

Quarter 2

Quarter 3

Quarter 4

Annual

1. Number of Batch Releases 1

2 14 6

23

2. Total duration of batch releases minutes 1.70E+02 2.07E+02 2.00E+03 6.02E+02 2.98E+03

3. Maximum batch release duration minutes 1.70E+02 1.40E+02 1.90E+02 1.30E+02 1.90E+02

4. Average batch release duration minutes 1.70E+02 1.04E+02 1.43E+02 1.00E+02 1.29E+02

5. Minimum batch release duration minutes 1.70E+02 6.70E+01 4.40E+01 4.50E+01 4.40E+01

6. Avg stream flow during periods of release of liquid effluent into a flowing stream Ft3/sec

The river flow is not used for dose calculations. The actual flow rate of Circulation Water (the water that is circulated within the plant for cooling) is determined for each liquid effluent release because this Circulation Water provides dilution and therefore reduces the projected dose.

5.3 Abnormal Releases 5.3.1 Gaseous Abnormal Releases Number of releases 1

Total activity released 4.04E-03 Ci From July 07, 2024, through July 09, 2024, an abnormal gaseous release occurred from Auxiliary Boiler A. Gaseous release permit G-20240709-2129-B was initiated to document the release and provide dose calculations. The only nuclide measured was H-3 with an activity of 4.95E-06 µCi/ml. No limits were exceeded and the activity released was included in the 2024 dose calculations.

5.3.2 Liquid Abnormal Releases Number of releases 1

Total activity released 9.90E-08 Ci During a routine run of the 2B RHR, very low activity levels of H3, Co-60, and Cs-137 were identified in one sample. Resampled on the next run of the system a week or two later and found the system clean. This activity was documented in a liquid release permit for U2 Torus L-20240327-492-C. Tracked via WO and increased sampling occurring when system is run. No active leak suspected but captured release permit to be conservative.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 19 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 5.4 Land Use Census Changes There were no changes that impacted the Radioactive Effluent Release Program.

Results of the Land Use Census are reported in the AREOR.

5.5 Meteorological Data The PBCEC Meteorological Program achieved a 99.8% Joint Frequency Distribution (JFD) for 2024. The quarterly and annual JFDs are included in Attachment 3, Meteorological Data.

5.6 Effluent Radiation Monitors Out of Service Greater Than 30 Days There were no effluent monitors out of service for greater that 30 days during 2024.

5.7 Offsite Dose Calculation Manual (ODCM) Changes There were no ODCM changes during 2024.

5.8 Process Control Program (PCP) Changes There were no Process Control Program (PCP) changes during changes during 2024.

5.9 Radioactive Waste Treatment System Changes There were no Radioactive Waste Treatment System changes during 2024.

5.10 Carbon-14 Carbon-14 (C-14) is a naturally occurring radionuclide with a 5,730-year half-life.

Nuclear weapons testing in the 1950s and 1960s significantly increased the amount of C-14 in the atmosphere. Nuclear power plants also produce C-14, but the amount is infinitesimal compared to what has been distributed in the environment due to weapons testing and what is produced by natural cosmic ray interactions.

In accordance with Regulatory Guide 1.21, Measuring, Evaluating, and Reporting Radioactive Material in Liquid and Gaseous Effluents and Solid Waste, the NRC recommended re-evaluating principal radionuclides and reporting C-14 as appropriate. Carbon-14 production and release estimates were calculated using active core coolant mass, average neutron flux by energy and reactor coolant nitrogen concentrations to determine Carbon-14 generation based upon an effective full power year. The C-14 was released primarily through the Main Offgas Stack (97%) with a small amount (3%) through the Reactor Building Exhaust Vents. The C-14 in liquid effluents is not a significant dose pathway, as determined from studies. The estimated generation for Peach Bottom Clean Energy Center during 2024 was 36.9 Curies.

Public dose estimates were performed using methodology from the ODCM which is based on Regulatory Guide 1.109 methodology. C-14 dose is included in dose calculation results in Table 2.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 20 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center 5.11 Errata/Corrections to Previous ARERRs There are no corrections to previous ARERRs included in this report.

5.12 Independent Spent Fuel Storage Installation (ISFSI) Monitoring Program A separate report is issued covering radioactive releases from the Independent Spent Fuel Storage Installation, NRC Docket No. 72-29 (ISFSI).

5.13 Other Supplemental Information 5.13.1 Temporary Outside Tanks There were no outside Temporary Tanks that exceeded any limits.

5.13.2 Measures and Approximations of Total Radioactivity

1.

Fission and Activation Gases The method used for gamma isotopic analysis is the Mirion GenieTM System with a gas marinelli beaker. Grab samples are taken and analyzed monthly to determine the isotopic mixture of noble gas activity released for the month. Airborne effluent gaseous activity was continuously monitored and recorded in accordance with ODCMS Table 4.8.C.1. The data from the noble gas radiation monitor were analyzed to report noble gas effluent activities. When no activity was identified in the grab isotopic analysis (un-id(s) or un-id(v)), the entire release must be assumed to be the radionuclide with the most-limiting dose factors for the release pathway (i.e. krypton-88 (Kr-88) for all ground-level releases, Kr-88 for elevated gamma dose and Kr-87 for elevated beta dose; see ODCM IV.B and NUREG-01331). The activity released is listed as "unidentified" in tables. If activity was found in the grab isotopic analysis, the isotopic mixture for the Noble Gas Monitor was determined from that isotopic mixture.

2.

Iodines The method used is the Mirion GenieTM System with a charcoal cartridge. Iodine activity was continuously sampled and analyzed in accordance with ODCMS Table 4.8.C.1.

3.

Particulates The method used is the Mirion GenieTM System with a particulate filter (47 mm diameter). Particulate activity was continuously sampled and analyzed in accordance with ODCM Table 4.8.C.1.

Composite particulate air samples were submitted to an offsite vendor laboratory for analyses of strontium-89 (Sr-89), Sr-90, nickel-63 (Ni-63) and gross alpha.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 21 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center

4.

Liquid Effluents Gamma isotopic activity concentrations are determined on each batch of liquid effluent prior to release using the Mirion GenieTM System in accordance with ODCMS Table 4.8.B.1. The total activity of a released batch is determined by multiplying each nuclide's concentration by the total volume discharged.

Composite liquid radwaste samples are analyzed for tritium on-site and submitted to an offsite vendor laboratory for analyses of iron-55 (Fe-55),

phosphorus-32 (P-32), Sr-89, Sr-90, Ni-63, and gross alpha.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 22 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center NEI 07-07 ONSITE RADIOLOGICAL GROUNDWATER MONITORING PROGRAM Peach Bottom Clean Energy Center has developed a Groundwater Protection Initiative (GPI) program in accordance with NEI 07-07, Industry Ground Water Protection Initiative - Final Guidance Document [12]. The purpose of the GPI is to ensure timely detection and an effective response to situations involving inadvertent radiological releases to groundwater to prevent migration of licensed radioactive material off-site and to quantify impacts on decommissioning. During 2024, PBCEC collected and analyzed groundwater samples in accordance with the requirements of Site Procedures. Results from groundwater sampling and analysis are reported in the Annual Radiological Environmental Operating Report (AREOR).

The groundwater tritium mass flux entering the unrestricted boundary was calculated as 10.7 curies. This activity is included in the liquid tables of Attachment 1.

6.1 Voluntary Notification During 2024, Peach Bottom Clean Energy Center did not make a voluntary NEI 07-07 notification to State/Local officials, NRC, and to other stakeholders required by site procedures.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 23 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center BIBLIOGRAPHY

[1] "American National Standards Institute/American Nuclear Society (ANSI/ANS)-2.17-2010 (R2016), Evaluation of Subsurface Radionuclide Transport at Commercial Nuclear Power Plants, La Grange Park, IL, reaffirmed 2016.".

[2] "USNRC Regulatory Guided 4.25 Assessment of Abnormal Radionuclide Discharges in Ground Water to the Unrestricted Area at Nuclear Power Plant Sites," March 2017.

[3] "USNRC Regulatory Guide 1.21, Measuring, Evaluating, and Reporting Radioactive Material in Liquid and Gaseous Effluents and Solid Waste, Washington, DC," June 2009.

[4] Nuclear Regulatory Commission, 30 June 2015. [Online]. Available: http://www.nrc.gov/reading-rm/basic-ref/students/animated-pwr.html. [Accessed October 2020].

[5] Nuclear Regulatory Commission, 25 June 2015. [Online]. Available: http://www.nrc.gov/reading-rm/basic-ref/students/animated-bwr.html. [Accessed October 2020].

[6] "NCRP Report No. 160 - Ionizing Radiation Exposure of the Population of the United States,"

National Council on Radiation Protection and Measurements, Bethesda, MD, 2009.

[7] Health Physics Society, [Online]. Available: http://hps.org/hpspublications/radiationfactsheets.html.

[Accessed 2020].

[8] "NRC Resource Page," [Online]. Available: http://www.nrc.gov/about-nrc/radiation.html. [Accessed 10 November 2020].

[9] "Japan Atomic Energy Agency," 06 November 2020. [Online]. Available:

https://www.jaea.go.jp/english/04/ntokai/houkan/houkan_02.html.

[10] "Regulatory Guide 1.109 - Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Demonstrating Compliance with 10 CFR Part 50, Appendix I," Nuclear Regulatory Commission, Ocotober, 1977.

[11] "NUREG-0133 - Preparation of Effluent Technical Specifications for Nuclear Power Plants,"

Nuclear Regulatory Commission, 1987.

[12] "NEI 07 Industry Ground Water Protection Initiative Final Guidance Document, Rev. 1,"

Nuclear Energy Institute, Washington, D.C., 2019.

[13] "10 CFR 50 - Domestic Licensing of Production and Utilization Facilities," US Nuclear Regulatory Commission, Washington, DC.

[14] "40 CFR 190 - Environmental Radiation Protection Standards for Nuclear Power Operation," US Environmental Protection Agency, Washington, DC.

[15] "10 CFR 20 - Standards for Protection Against Radiation," US Nuclear Regulatory Commission, Washington, DC.

[16] "40 CFR 141 - National Primary Drinking Water Regulations," US Environmental Protection Agency, Washington, DC..

[17] "NUREG-0324 - XOQDOQ, Program for the Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations," Nuclear Regulatory Commission, September, 1977.

[18] "NUREG-1301 - Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Pressurized Water Reactors," Nuclear Regulatory Commission, April 1991.

[19] "NUREG-1302 - Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors," Nuclear Regulatory Commission, April 1991.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 24 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center

[20] "USNRC Regulatory Guide 4.13 - Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications, Revision 2," Nuclear Regulatory Commision, June, 2019.

[21] "USNRC Regulatory Guide 4.15 - Quality Assurance for Radiological Monitoring Programs (Inception through Normal Operations to License Termination) -- Effluent Streams and the Environment," Nuclear Regulatory Commission, July, 2007.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 25 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center

, ARERR Release Summary Tables (RG-1.21 Tables)

GASEOUS EFFLUENTS Table 3, Gaseous Effluents Summation of All Releases Units 2 and 31 A. Fission & Activation Gases Unit Quarter 1

Quarter 2

Quarter 3

Quarter 4

Annual Est. Total Error %

1. Total Release Ci 1.18E+01 6.96E+00 6.08E+00 4.76E+01 7.25E+01 4.00E+01

2. Average release rate for the period Ci/sec 1.50E+00 8.85E-01 7.64E-01 5.99E+00 2.29E+00 B. Iodines-131

1. Total Release Ci 2.92E-05 1.89E-05 3.71E-05 6.01E-03 6.10E-03 1.90E+01

2. Average release rate for the period Ci/sec 3.71E-06 2.40E-06 4.67E-06 7.56E-04 1.93E-04 C. Particulates

1. Total Release Ci 2.28E-05 3.27E-05 3.71E-05 5.31E-04 6.23E-04 2.80E+01

2. Average release rate for the period Ci/sec 2.90E-06 4.16E-06 4.67E-06 6.68E-05 1.97E-05 D. Tritium

1. Total Release Ci 7.18E+00 1.28E+01 9.87E+00 6.52E+00 3.63E+01 1.30E+01

2. Average release rate for the period Ci/sec 9.13E-01 1.62E+00 1.24E+00 8.21E-01 1.15E+00 E. Gross Alpha

1. Total Release Ci

<LLD

<LLD 4.00E+02

2. Average release rate for the period Ci/sec N/A N/A N/A N/A N/A F. Carbon-14

1. Total Release Ci 9.46E+00 9.54E+00 9.27E+00 8.61E+00 3.69E+01

2. Average release rate for the period Ci/sec 1.20E+00 1.21E+00 1.17E+00 1.08E+00 1.17E+00 1 Percent of limit is on Table 1, Peach Bottom Clean Energy Center Units 2 and 3 Dose Summary. C-14 is not part of the Appendix I dose limits and therefore, not included in Table 1. However, C-14 is reported in Table 2, Total Annual Offsite-Dose Comparison to 40 CFR 190 Limits for PBCEC.

Annual Radioactive Effluent Release Report YEAR: 2024 Page 26 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, ARERR Release Summary Tables (RG-1.21 Tables)

Table 4, Gaseous Effluents - Ground Level Release Batch Mode Units 2 and 3 Radionuclide Released Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total for year Fission Gases None Ci

<LLD

<LLD Ci Ci Total for Period Ci

<LLD

<LLD Iodines None Ci

<LLD

<LLD Ci Ci Ci Total for Period Ci

<LLD

<LLD Particulates None Ci

<LLD

<LLD Ci Ci Ci Ci Ci Total for Period Ci

<LLD

<LLD Tritium H-3 Ci

<LLD

<LLD 4.04E-03

<LLD 4.04E-03 Gross Alpha Alpha Ci

<LLD

<LLD Carbon-14 C-14 Ci

<LLD

Annual Radioactive Effluent Release Report YEAR: 2024 Page 27 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, ARERR Release Summary Tables (RG-1.21 Tables)

Table 5, Gaseous Effluents - Ground Level Release Continuous Mode Units 2 and 3 Radionuclide Released Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total for year Fission Gases Unidentified Ci 1.00E+01 6.44E+00

<LLD 3.55E+01 5.19E+01 Ci Total for Period Ci 1.00E+01 6.44E+00

<LLD 3.55E+01 5.19E+01 Iodines I-131 Ci

<LLD

<LLD 1.70E-05 1.70E-05 I-133 Ci

<LLD

<LLD 1.55E-05 1.55E-05 Ci Ci Total for Period Ci

<LLD

<LLD 3.25E-05 3.25E-05 Particulates Cr-51 Ci

<LLD

<LLD 2.17E-04 2.17E-04 Mn-54 Ci

<LLD

<LLD 2.65E-05 2.65E-05 Co-58 Ci

<LLD

<LLD 4.75E-05 4.75E-05 Co-60 Ci

<LLD 4.68E-06

<LLD 1.57E-04 1.62E-04 Sb-124 Ci

<LLD

<LLD 9.06E-06 9.06E-06 Ci Ci Total for Period Ci

<LLD 4.68E-06

<LLD 4.57E-04 4.62E-04 Tritium H-3 Ci 6.16E+00 8.96E+00 6.12E+00 5.38E+00 2.66E+01 Gross Alpha Alpha Ci

<LLD

<LLD Carbon-14 C-14 Ci 2.83E-01 2.86E-01 2.77E-01 2.59E-01 1.11E+00

Annual Radioactive Effluent Release Report YEAR: 2024 Page 28 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, ARERR Release Summary Tables (RG-1.21 Tables)

Table 6, Gaseous Effluents - Elevated Level Release Batch Mode Units 2 and 3 Radionuclide Released Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total for year Fission Gases None Ci

<LLD

<LLD Ci Ci Total for Period Ci

<LLD

<LLD Iodines None Ci

<LLD

<LLD Ci Ci Ci Total for Period Ci

<LLD

<LLD Particulates None Ci

<LLD

<LLD Ci Ci Ci Ci Ci Total for Period Ci

<LLD

<LLD Tritium H-3 Ci

<LLD

<LLD Gross Alpha Alpha Ci

<LLD

<LLD Carbon-14 C-14 Ci

<LLD

Annual Radioactive Effluent Release Report YEAR: 2024 Page 29 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, ARERR Release Summary Tables (RG-1.21 Tables)

Table 7, Gaseous Effluents - Elevated Level Release Continuous Mode Units 2 and 3 Radionuclide Released Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total for year Fission Gases Unidentified Ci

<LLD

<LLD 3.96E+00 1.22E+01 1.61E+01 Kr-85m Ci

<LLD

<LLD 4.75E-01

<LLD 4.75E-01 Xe-133 Ci

<LLD 5.18E-01 9.82E-01

<LLD 1.50E+00 Xe-135 Ci 1.73E+00

<LLD 6.63E-01

<LLD 2.39E+00 Total for Period Ci 1.73E+00 5.18E-01 6.08E+00 1.22E+01 2.05E+01 Iodines I-131 Ci 2.92E-05 1.89E-05 3.71E-05 5.99E-03 6.08E-03 I-133 Ci 6.26E-05 6.07E-05 8.40E-05 2.33E-02 2.35E-02 I-135 Ci

<LLD

<LLD 2.78E-06 2.78E-06 Total for Period Ci 9.18E-05 7.95E-05 1.21E-04 2.93E-02 2.95E-02 Particulates Mn-54 Ci

<LLD

<LLD 7.13E-06 7.13E-06 Co-58 Ci 2.84E-07

<LLD 1.56E-06 1.33E-05 1.51E-05 Co-60 Ci 2.31E-06 2.02E-06 4.22E-06 1.99E-05 2.85E-05 Zn-65 Ci

<LLD

<LLD 7.06E-07 1.10E-05 1.17E-05 Sr-89 Ci 2.02E-05 2.60E-05 3.06E-05 2.14E-05 9.82E-05 Ag-110m Ci

<LLD

<LLD 6.86E-07 6.86E-07 Total for Period Ci 2.28E-05 2.80E-05 3.71E-05 7.35E-05 1.61E-04 Tritium H-3 Ci 1.03E+00 3.79E+00 3.74E+00 1.15E+00 9.71E+00 Gross Alpha Alpha Ci

<LLD

<LLD Carbon-14 C-14 Ci 9.18E+00 9.25E+00 8.99E+00 8.35E+00 3.58E+01

Annual Radioactive Effluent Release Report YEAR: 2024 Page 30 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, ARERR Release Summary Tables (RG-1.21 Tables)

LIQUID EFFLUENTS Table 8, Liquid Effluents - Summation of All Releases Units 2 and 3 A. Fission & Activation Products Unit Quarter 1

Quarter 2

Quarter 3

Quarter 4

Annual Est.

Total Error %

1. Total Release Ci 1.25E-08 3.37E-06 1.54E-05 3.47E-05 5.35E-05 1.60E+01

2. Average diluted concentration Ci/mL 1.73E-17 5.07E-15 2.24E-14 5.58E-14 1.99E-14 B. Tritium

1. Total Release Ci 6.75E-01 2.20E-01 1.16E+01 6.49E+00 1.90E+01 6.40E+00

2. Average diluted concentration Ci/mL 9.38E-10 3.30E-10 1.69E-08 1.04E-08 7.06E-09 C. Dissolved & Entrained Gases

1. Total Release Ci 7.41E-06

<LLD 5.30E-05

<LLD 6.04E-05 2.80E+01

2. Average diluted concentration Ci/mL 1.03E-14 N/A 7.70E-14 N/A 2.24E-14 D. Gross Alpha Activity

1. Total Release Ci

<LLD

<LLD 2.30E+01

2. Average diluted concentration Ci/mL N/A N/A N/A N/A N/A E. Volume of Waste Released (prior to dilution)

Liters 1.71E+08 1.71E+08 1.73E+08 1.73E+08 6.88E+08 F. Volume of Dilution Water Used During Period Liters 7.19E+11 6.65E+11 6.88E+11 6.22E+11 2.70E+12

Annual Radioactive Effluent Release Report YEAR: 2024 Page 31 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, ARERR Release Summary Tables (RG-1.21 Tables)

Table 9, Batch Mode Liquid Effluents Units 2 and 3 Radionuclide Released Unit s

Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total for year Fission and Activation Products Mn-54 Ci

<LLD 4.19E-07

<LLD 1.02E-07 5.20E-07 Co-58 Ci

<LLD

<LLD 8.09E-06 8.09E-06 Co-60 Ci

<LLD 1.93E-06 1.00E-05 2.65E-05 3.85E-05 Cs-137 Ci

<LLD 1.03E-06 5.42E-06

<LLD 6.45E-06 Total for Period Ci

<LLD 3.37E-06 1.54E-05 3.47E-05 5.35E-05 Tritium H-3 Ci 4.82E-01 1.05E-03 4.78E+00 1.37E+00 6.63E+00 Gross Alpha Alpha Ci

<LLD

<LLD Entrained Gases Xe-135 Ci 7.41E-06

<LLD 5.30E-05

<LLD 6.04E-05 Total for Period Ci 7.41E-06

<LLD 5.30E-05

<LLD 6.04E-05

Annual Radioactive Effluent Release Report YEAR: 2024 Page 32 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, ARERR Release Summary Tables (RG-1.21 Tables)

Table 10, Continuous Mode Liquid Effluents Units 2 and 3 Radionuclide Released Unit s

Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total for year Fission and Activation Products Co-60 Ci 1.15E-08

<LLD

<LLD 1.15E-08 Cs-137 Ci 9.79E-10

<LLD

<LLD 9.79E-10 Total for Period Ci 1.25E-08

<LLD

<LLD 1.25E-08 Tritium H-3 Ci 1.93E-01 2.19E-01 6.86E+00 5.12E+00 1.24E+01 Gross Alpha Alpha Ci

<LLD

<LLD Entrained Gases None Ci

<LLD

<LLD Ci Total for Period Ci

<LLD

Annual Radioactive Effluent Release Report YEAR: 2024 Page 33 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center

, Solid Waste Information Table 11, Resins, Filters, and Evaporator Bottoms Summary for Units 2 and 3 Waste Volume Curies Shipped Class ft3 m3 A

2.17E+03 6.13E+01 3.25E+02 B

0.00E+00 0.00E+00 0.00E+00 C

0.00E+00 0.00E+00 0.00E+00 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 2.17E+03 6.13E+01 3.25E+02 Major Nuclides for Above Table: H-3, C-14, Mn-54, Fe-55, Co-58, Co-60, Ni-59, Ni-63, Zn-65, Sr-90, Nb-94, Tc-99, Ag-110m, I-129, Cs-137, Pu-238, Pu-239, Pu-241, Am-241, Cm-242, Cm-244 Waste Class A Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 5.02%

1.63E+01 Fe-55 29.96%

9.73E+01 Co-60 55.9%

1.82E+02 Ni-63 1.32%

4.29E+00 Zn-65 4.37%

1.42E+01 Cs-137 1.95%

6.35E+00 Total Combined Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 5.02%

1.63E+01 Fe-55 29.96%

9.73E+01 Co-60 55.9%

1.82E+02 Ni-63 1.32%

4.29E+00 Zn-65 4.37%

1.42E+01 Cs-137 1.95%

6.35E+00

Annual Radioactive Effluent Release Report YEAR: 2024 Page 34 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Solid Waste Information Table 12, Dry Active Waste (DAW) Summary for Units 2 and 3 Waste Volume Curies Shipped Class ft3 m3 A

1.53E+04 4.33E+02 2.34E+00 B

0.00E+00 0.00E+00 0.00E+00 C

0.00E+00 0.00E+00 0.00E+00 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 1.53E+04 4.33E+02 2.34E+00 Major Nuclides for Above Table: H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Zn-65, Sr-90, Tc-99, I-129, Cs-137, Ce-144 Waste Class A Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 4.21%

9.87E-02 Fe-55 19.74%

4.62E-01 Co-60 62.56%

1.47E+00 Zn-65 1.44%

3.37E-02 Cs-137 9.55%

2.24E-01 Total Combined Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 4.21%

9.87E-02 Fe-55 19.74%

4.62E-01 Co-60 62.56%

1.47E+00 Zn-65 1.44%

3.37E-02 Cs-137 9.55%

2.24E-01

Annual Radioactive Effluent Release Report YEAR: 2024 Page 35 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Solid Waste Information Table 13, Irradiated Components Summary for Units 2 and 3 Waste Volume Curies Shipped Class ft3 m3 A

2.63E+00 7.45E-02 2.08E+00 B

0.00E+00 0.00E+00 0.00E+00 C

0.00E+00 0.00E+00 0.00E+00 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 2.63E+00 7.45E-02 2.08E+00 Major Nuclides for Above Table: H-3, C-14, Mn-54, Fe-55, Co-58, Co-60, Ni-59, Ni-63, Nb-94, Tc-99, I-129, Cs-137, Pu-238, Am-241, Cm-242, Cm-244 Waste Class A Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 1.33%

2.76E-02 Fe-55 48.43%

1.01E+00 Co-60 46.88%

9.74E-01 Ni-63 2.84%

5.90E-02 Total Combined Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 1.33%

2.76E-02 Fe-55 48.43%

1.01E+00 Co-60 46.88%

9.74E-01 Ni-63 2.84%

5.90E-02

Annual Radioactive Effluent Release Report YEAR: 2024 Page 36 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Solid Waste Information Table 14, Other Wastes Summary for Units 2 and 3 Waste Volume Curies Shipped Class ft3 m3 A

3.71E+02 1.05E+01 7.78E-03 B

0.00E+00 0.00E+00 0.00E+00 C

0.00E+00 0.00E+00 0.00E+00 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 3.71E+02 1.05E+01 7.78E-03 Major Nuclides for Above Table: H-3, C-14, Mn-54, Fe-55, Co-60, Ni-63, Zn-65, Sr-90, Tc-99, I-129, Cs-137, Ce-144 Waste Class A Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 5.05%

3.91E-04 Fe-55 19.96%

1.54E-03 Co-60 59.89%

4.63E-03 Zn-65 1.78%

1.38E-04 Cs-137 10.94%

8.46E-04 Total Combined Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 5.05%

3.91E-04 Fe-55 19.96%

1.54E-03 Co-60 59.89%

4.63E-03 Zn-65 1.78%

1.38E-04 Cs-137 10.94%

8.46E-04

Annual Radioactive Effluent Release Report YEAR: 2024 Page 37 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Solid Waste Information Table 15, Sum of All Low-Level Waste Shipped from Units 2 and 3 Waste Volume Curies Shipped Class ft3 m3 A

1.78E+04 5.05E+02 3.29E+02 B

0.00E+00 0.00E+00 0.00E+00 C

0.00E+00 0.00E+00 0.00E+00 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 1.78E+04 5.05E+02 3.29E+02 Major Nuclides for Above Table: H-3, C-14, Mn-54, Fe-55, Co-58, Co-60, Ni-59, Ni-63, Zn-65, Sr-90, Nb-94, Tc-99, Ag-110m, I-129, Cs-137, Ce-144, Pu-238, Pu-239, Pu-241, Am-241, Cm-242, Cm-244 Waste Class A Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 4.99%

1.64E+01 Fe-55 30.0%

9.88E+01 Co-60 55.89%

1.84E+02 Ni-63 1.33%

4.38E+00 Zn-65 4.32%

1.42E+01 Cs-137 2.0%

6.57E+00 Total Combined Percent Abundance > 1.0%

Nuclide Name Percent Abundance Curies Mn-54 4.99%

1.64E+01 Fe-55 30.0%

9.88E+01 Co-60 55.89%

1.84E+02 Ni-63 1.33%

4.38E+00 Zn-65 4.32%

1.42E+01 Cs-137 2.0%

6.57E+00

Annual Radioactive Effluent Release Report YEAR: 2024 Page 38 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Solid Waste Information SOLID WASTE DISPOSITION Table 16, Solid Waste Shipped from the Peach Bottom Clean Energy Center Number of Shipments Mode of Transportation Destination 1

Hittman Transport Services Energy Solutions - Memphis 1790 Dock Street 18 Hittman Transport Services Energy Solutions Services. (CVRF - BCO)

Bear Creek Operations 1

Hittman Transport Services Energy Solutions - BWF Clive Disposal Site - Bulk Waste Facility 12 Hittman Transport Services Energy Solutions LLC Clive Disposal Site - Containerized Waste Facility 1

Landstar - Ranger Energy Solutions Services. (CVRF - BCO) 33 Total IRRADIATED FUEL DISPOSITION Table 17, Irradiated Fuel Shipments Disposition Peach Bottom Clean Energy Center Number of Shipments Mode of Transportation Destination 0

0 Total 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 39 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center

, Meteorological Data METEOROLOGICAL DATA

SUMMARY

1.1 Stability class Table 18, 2024 Classification of Atmospheric Stability Stability Condition Pasquill Categories Percentage Extremely Unstable A

12.13 Moderately Stable B

9.97 Slightly Unstable C

5.61 Neutral D

33.54 Slightly Stable E

26.42 Moderately Stable F

7.27 Extremely Stable G

4.92 Total 99.87

Annual Radioactive Effluent Release Report YEAR: 2024 Page 40 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data 1.2 Data Recovery Table 19, 2024 Meteorological Sensor Data Recovery Measurement Elevation Recovered Hours Recovered Percent Lost Hours Wind Speed 33 ft.

8769 99.8 15 Wind Speed 75 ft.

8769 99.8 15 Wind Speed 320 ft.

8771 99.9 13 Wind Direction 33 ft.

8769 99.8 15 Wind Direction 75 ft.

8769 99.8 15 Wind Direction 320 ft.

8771 99.9 13 Ambient Temperature 33 ft.

8769 99.8 15 Differential Temperature 150-33 ft.

8769 99.8 15 Differential Temperature 316-33 ft.

8769 99.8 15 Dew Point 33 ft.

8769 99.8 15 Precipitation 8 ft.

8769 99.8 15 Average*

99.8

Average of priority parameters (all except precipitation and dew point)

Valid Hours Recovered Percent Lost Hours Lower-Level Joint Frequency %

8769 99.8 15 Middle-Level Joint Frequency %

8769 99.8 15 Upper-Level Joint Frequency %

8764 99.8 20

Annual Radioactive Effluent Release Report YEAR: 2024 Page 41 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data 1.3 Joint Frequency Distributions

1.

Period of Record: 2024

2.

Stability Class: All

a.

Periods of calm 33 foot (percent): 0.11%

b.

Periods of calm (320 foot (percent): 0.02%

c.

Hours of missing data: 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br />

d.

Meteorological data are reported in percentage of total hours for all stability classes.

3.

Elevation: 320 ft

Annual Radioactive Effluent Release Report YEAR: 2024 Page 42 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Extremely Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 0 0 0 0 3 NNE 0 16 0 0 0 0 16 NE 3 5 0 0 0 0 8 ENE 11 7 0 0 0 0 18 E 8 23 0 0 0 0 31 ESE 3 9 5 0 0 0 17 SE 1 2 1 1 0 0 5 SSE 0 3 2 0 0 0 5 S 0 0 5 0 0 0 5 SSW 0 0 1 0 0 0 1 SW 0 0 3 1 0 0 4 WSW 1 0 1 2 0 0 4 W 0 0 4 0 0 0 4 WNW 0 1 11 5 0 0 17 NW 0 4 7 4 0 0 15 NNW 2 5 4 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 29 78 44 13 0 0 164 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 43 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Moderately Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 10 3 0 0 0 14 NNE 1 11 0 0 0 0 12 NE 1 4 2 0 0 0 7 ENE 8 2 0 0 0 0 10 E 7 7 1 0 0 0 15 ESE 1 4 0 3 0 0 8 SE 3 4 5 1 0 0 13 SSE 0 2 7 0 0 0 9 S 0 4 3 0 0 0 7 SSW 0 1 3 0 0 0 4 SW 0 0 0 4 0 0 4 WSW 0 1 1 1 0 0 3 W 1 3 10 5 0 0 19 WNW 0 4 11 7 0 0 22 NW 0 0 11 16 2 0 29 NNW 3 4 12 1 0 0 20 Variable 0 0 0 0 0 0 0 Total 26 61 69 38 2 0 196 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 44 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Slightly Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 8 1 0 0 0 11 NNE 2 4 0 0 0 0 6 NE 1 0 0 0 0 0 1 ENE 7 2 0 0 0 0 9 E 2 8 0 0 0 0 10 ESE 0 5 1 0 0 0 6 SE 2 3 0 0 0 0 5 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 1 0 0 0 0 1 SW 1 1 3 0 0 0 5 WSW 0 1 2 1 0 0 4 W 0 6 4 4 2 0 16 WNW 0 5 4 0 0 0 9 NW 0 3 16 10 0 0 29 NNW 0 12 15 1 0 0 28 Variable 0 0 0 0 0 0 0 Total 17 59 46 16 2 0 140 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 45 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Neutral - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 11 33 10 0 0 0 54 NNE 12 17 1 0 0 0 30 NE 29 6 0 0 0 0 35 ENE 41 10 0 0 0 0 51 E 36 17 5 0 0 0 58 ESE 16 32 10 0 0 0 58 SE 10 23 15 0 0 0 48 SSE 9 27 16 1 0 0 53 S 8 9 17 0 0 0 34 SSW 2 8 5 0 0 0 15 SW 4 6 4 3 0 0 17 WSW 4 12 10 8 0 0 34 W 4 27 18 14 3 0 66 WNW 3 45 51 22 1 0 122 NW 4 44 71 25 0 0 144 NNW 7 58 69 16 4 0 154 Variable 0 0 0 0 0 0 0 Total 200 374 302 89 8 0 973 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 46 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Slightly Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 15 3 1 0 0 0 19 NNE 13 0 0 0 0 0 13 NE 14 0 0 0 0 0 14 ENE 14 0 0 0 0 0 14 E 32 2 0 0 0 0 34 ESE 30 4 0 0 0 0 34 SE 12 6 0 0 0 0 18 SSE 18 13 0 0 0 0 31 S 11 12 6 0 0 0 29 SSW 9 10 0 0 0 0 19 SW 4 11 1 0 0 0 16 WSW 5 30 2 0 0 0 37 W 17 60 9 0 0 0 86 WNW 18 28 3 0 0 0 49 NW 18 24 4 0 0 0 46 NNW 16 19 1 0 0 0 36 Variable 0 0 0 0 0 0 0 Total 246 222 27 0 0 0 495 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 47 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Moderately Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 0 0 0 0 0 6 NNE 5 0 0 0 0 0 5 NE 4 0 0 0 0 0 4 ENE 11 0 0 0 0 0 11 E 12 0 0 0 0 0 12 ESE 8 0 0 0 0 0 8 SE 1 0 0 0 0 0 1 SSE 2 0 0 0 0 0 2 S 2 0 0 0 0 0 2 SSW 4 1 0 0 0 0 5 SW 5 2 0 0 0 0 7 WSW 12 9 0 0 0 0 21 W 11 2 0 0 0 0 13 WNW 12 0 0 0 0 0 12 NW 3 4 0 0 0 0 7 NNW 7 1 0 0 0 0 8 Variable 0 0 0 0 0 0 0 Total 105 19 0 0 0 0 124 Hours of calm in this stability class: 5 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 48 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Extremely Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 0 0 0 0 0 3 NNE 2 0 0 0 0 0 2 NE 6 0 0 0 0 0 6 ENE 2 0 0 0 0 0 2 E 3 0 0 0 0 0 3 ESE 1 0 0 0 0 0 1 SE 3 0 0 0 0 0 3 SSE 4 0 0 0 0 0 4 S 4 0 0 0 0 0 4 SSW 3 0 0 0 0 0 3 SW 6 0 0 0 0 0 6 WSW 6 3 0 0 0 0 9 W 8 0 0 0 0 0 8 WNW 6 0 0 0 0 0 6 NW 6 0 0 0 0 0 6 NNW 4 0 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 67 3 0 0 0 0 70 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 49 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Extremely Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 1 0 0 0 1 NE 0 0 0 1 0 0 1 ENE 0 1 0 0 0 0 1 E 0 1 0 0 0 0 1 ESE 0 0 2 0 0 0 2 SE 0 0 0 1 0 0 1 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 2 3 2 0 0 7 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 50 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Moderately Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 0 0 0 1 NNE 0 0 4 0 0 0 4 NE 0 1 0 0 0 0 1 ENE 0 1 0 0 0 0 1 E 0 6 0 0 0 0 6 ESE 0 4 2 0 0 0 6 SE 0 0 1 2 0 0 3 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 2 0 0 2 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 12 8 4 0 0 24 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 51 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Slightly Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 2 2 0 0 0 4 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 3 0 0 0 0 3 ESE 0 6 1 0 0 0 7 SE 0 0 1 2 0 0 3 SSE 0 0 0 0 0 0 0 S 0 0 0 1 0 0 1 SSW 0 0 0 0 0 0 0 SW 0 0 0 1 1 0 2 WSW 0 0 0 1 0 0 1 W 0 0 0 5 0 0 5 WNW 0 0 0 6 7 3 16 NW 0 0 0 1 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 11 4 17 8 3 43 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 3 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 52 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Neutral - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 23 42 18 2 0 86 NNE 1 9 18 2 0 0 30 NE 4 14 18 2 4 0 42 ENE 4 24 14 3 0 0 45 E 2 27 18 2 0 0 49 ESE 0 31 28 22 10 8 99 SE 2 24 35 26 2 3 92 SSE 2 9 21 10 3 0 45 S 1 10 18 20 8 0 57 SSW 0 4 5 4 3 0 16 SW 1 8 7 9 8 0 33 WSW 3 6 12 10 10 8 49 W 1 5 12 25 16 23 82 WNW 1 4 21 80 49 28 183 NW 2 13 37 80 54 14 200 NNW 1 30 49 47 13 4 144 Variable 0 0 0 0 0 0 0 Total 26 241 355 360 182 88 1252 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 1 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 53 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Slightly Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 14 12 4 0 0 32 NNE 3 16 4 2 0 0 25 NE 4 9 4 1 0 0 18 ENE 11 13 7 0 0 0 31 E 4 9 10 1 0 0 24 ESE 3 22 20 6 0 1 52 SE 1 19 22 1 0 0 43 SSE 2 8 11 2 0 1 24 S 0 14 28 12 7 1 62 SSW 2 6 11 5 3 0 27 SW 0 2 9 14 0 0 25 WSW 2 5 9 19 4 0 39 W 1 3 8 12 8 0 32 WNW 5 3 14 44 10 0 76 NW 4 3 31 29 6 0 73 NNW 2 8 32 10 3 0 55 Variable 0 0 0 0 0 0 0 Total 46 154 232 162 41 3 638 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 54 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Moderately Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 0 0 0 0 6 NNE 1 5 3 0 0 0 9 NE 1 3 1 0 0 0 5 ENE 0 5 2 0 0 0 7 E 3 3 0 0 0 0 6 ESE 1 3 3 1 0 0 8 SE 2 4 10 1 0 0 17 SSE 0 0 2 0 0 0 2 S 1 1 0 0 0 0 2 SSW 1 5 4 0 0 0 10 SW 0 10 8 1 0 0 19 WSW 3 7 8 6 0 0 24 W 1 2 3 5 0 0 11 WNW 0 2 2 4 0 0 8 NW 2 1 4 1 0 0 8 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 16 57 50 19 0 0 142 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 55 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: January - March 2024 Stability Class - Extremely Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 0 0 0 1 NNE 1 1 0 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 2 1 0 0 0 3 SW 0 4 11 0 0 0 15 WSW 2 2 4 3 0 0 11 W 0 0 7 6 0 0 13 WNW 0 1 2 0 0 0 3 NW 1 1 6 1 0 0 9 NNW 0 4 2 1 0 0 7 Variable 0 0 0 0 0 0 0 Total 4 15 34 11 0 0 64 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 8

Annual Radioactive Effluent Release Report YEAR: 2024 Page 56 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Extremely Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 12 2 0 0 0 18 NNE 8 15 0 0 0 0 23 NE 4 6 0 0 0 0 10 ENE 29 4 0 0 0 0 33 E 25 9 0 0 0 0 34 ESE 12 20 0 0 0 0 32 SE 2 29 1 1 0 0 33 SSE 2 13 8 0 0 0 23 S 1 21 26 4 0 0 52 SSW 0 7 6 0 0 0 13 SW 0 5 4 0 0 0 9 WSW 0 3 0 0 0 0 3 W 0 1 7 1 0 0 9 WNW 1 4 9 3 0 0 17 NW 0 2 8 0 0 0 10 NNW 3 6 20 4 0 0 33 Variable 0 0 0 0 0 0 0 Total 91 157 91 13 0 0 352 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 57 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Moderately Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 5 2 0 0 0 11 NNE 5 7 0 0 0 0 12 NE 4 4 0 0 0 0 8 ENE 15 2 0 0 0 0 17 E 13 5 0 0 0 0 18 ESE 9 3 0 0 0 0 12 SE 7 4 2 3 0 0 16 SSE 1 8 7 0 0 0 16 S 0 14 7 4 0 0 25 SSW 0 5 3 0 0 0 8 SW 0 4 5 1 0 0 10 WSW 0 2 5 0 0 0 7 W 0 2 10 1 0 0 13 WNW 0 2 6 3 0 0 11 NW 0 5 7 1 0 0 13 NNW 3 13 23 8 0 0 47 Variable 0 0 0 0 0 0 0 Total 61 85 77 21 0 0 244 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 58 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Slightly Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 4 2 0 0 0 9 NNE 2 5 0 0 0 0 7 NE 4 2 0 0 0 0 6 ENE 7 7 0 0 0 0 14 E 8 2 1 0 0 0 11 ESE 4 4 0 0 0 0 8 SE 4 2 2 1 0 0 9 SSE 0 6 5 0 0 0 11 S 1 3 7 0 0 0 11 SSW 0 2 0 0 0 0 2 SW 1 0 1 0 0 0 2 WSW 2 2 4 2 0 0 10 W 1 2 1 0 0 0 4 WNW 0 1 1 2 0 0 4 NW 2 2 6 0 0 0 10 NNW 2 9 5 2 0 0 18 Variable 0 0 0 0 0 0 0 Total 41 53 35 7 0 0 136 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 59 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Neutral - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 15 15 9 0 0 0 39 NNE 18 10 1 0 0 0 29 NE 26 1 0 0 0 0 27 ENE 19 3 0 0 0 0 22 E 27 10 0 0 0 0 37 ESE 14 4 0 0 0 0 18 SE 22 27 7 4 0 0 60 SSE 26 91 23 0 0 0 140 S 15 39 15 0 0 0 69 SSW 9 15 2 0 0 0 26 SW 9 15 6 1 0 0 31 WSW 6 3 5 9 0 0 23 W 3 10 10 6 0 0 29 WNW 6 15 12 0 0 0 33 NW 8 20 14 1 0 0 43 NNW 8 28 15 2 0 0 53 Variable 0 0 0 0 0 0 0 Total 231 306 119 23 0 0 679 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 60 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Slightly Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 3 1 0 0 0 12 NNE 22 1 0 0 0 0 23 NE 13 0 0 0 0 0 13 ENE 11 0 0 1 0 0 12 E 8 2 0 0 0 0 10 ESE 28 2 0 0 0 0 30 SE 20 10 0 0 0 0 30 SSE 39 17 0 0 0 0 56 S 35 27 4 0 0 0 66 SSW 26 9 0 0 0 0 35 SW 15 11 1 0 0 0 27 WSW 20 18 1 0 0 0 39 W 18 38 4 0 0 0 60 WNW 26 20 1 0 0 0 47 NW 24 25 7 0 0 0 56 NNW 12 11 1 0 0 0 24 Variable 0 0 0 0 0 0 0 Total 325 194 20 1 0 0 540 Hours of calm in this stability class: 15 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 61 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Moderately Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 0 0 0 0 0 2 NNE 3 0 0 0 0 0 3 NE 0 0 0 0 0 0 0 ENE 5 0 1 0 0 0 6 E 4 0 0 0 0 0 4 ESE 8 0 0 0 0 0 8 SE 7 0 0 0 0 0 7 SSE 1 0 0 0 0 0 1 S 5 0 0 0 0 0 5 SSW 8 0 0 0 0 0 8 SW 19 1 0 0 0 0 20 WSW 15 15 0 0 0 0 30 W 9 19 0 0 0 0 28 WNW 7 3 0 0 0 0 10 NW 8 2 0 0 0 0 10 NNW 2 2 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 103 42 1 0 0 0 146 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 62 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Extremely Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 0 0 0 0 0 1 NNE 1 0 0 0 0 0 1 NE 1 0 0 0 0 0 1 ENE 1 0 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 1 0 0 0 0 0 1 SW 3 4 0 0 0 0 7 WSW 10 9 0 0 0 0 19 W 10 7 0 0 0 0 17 WNW 3 1 0 0 0 0 4 NW 3 0 0 0 0 0 3 NNW 2 0 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 36 21 0 0 0 0 57 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 63 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Extremely Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 1 0 0 0 0 1 NE 0 4 2 0 0 0 6 ENE 0 0 1 0 0 0 1 E 0 14 1 2 0 0 17 ESE 0 1 10 5 0 0 16 SE 0 0 3 2 0 0 5 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 20 17 9 0 0 46 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 64 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Moderately Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 0 0 0 0 2 NNE 0 3 0 0 0 0 3 NE 0 1 0 0 0 0 1 ENE 1 1 0 0 0 0 2 E 0 5 0 1 0 0 6 ESE 0 7 4 1 0 0 12 SE 0 1 5 1 0 0 7 SSE 0 0 0 0 0 0 0 S 0 0 5 3 0 0 8 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 1 0 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 1 20 14 7 0 0 42 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 65 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Slightly Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 1 1 0 0 5 NNE 0 1 1 0 0 0 2 NE 2 4 0 0 0 0 6 ENE 0 3 1 0 0 0 4 E 0 3 0 0 0 0 3 ESE 0 2 3 0 0 0 5 SE 0 0 8 1 0 0 9 SSE 0 0 7 0 0 0 7 S 0 2 17 5 4 0 28 SSW 0 0 2 1 0 0 3 SW 0 0 1 1 0 0 2 WSW 0 0 0 2 0 0 2 W 0 1 0 3 1 1 6 WNW 0 2 3 7 1 3 16 NW 0 0 4 7 2 0 13 NNW 0 1 6 1 1 0 9 Variable 0 0 0 0 0 0 0 Total 2 22 54 29 9 4 120 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 66 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Neutral - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 14 10 23 1 0 50 NNE 4 18 10 6 0 0 38 NE 6 10 12 6 0 0 34 ENE 12 10 17 3 0 0 42 E 8 16 25 24 6 0 79 ESE 11 30 24 30 5 0 100 SE 3 21 63 31 5 6 129 SSE 2 14 48 23 2 0 89 S 4 32 59 44 4 1 144 SSW 1 11 25 3 0 0 40 SW 3 11 16 15 0 1 46 WSW 3 7 8 10 3 11 42 W 1 5 10 15 12 5 48 WNW 0 12 14 23 11 2 62 NW 3 25 32 37 11 2 110 NNW 2 22 28 18 8 1 79 Variable 0 0 0 0 0 0 0 Total 65 258 401 311 68 29 1132 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 67 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Slightly Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 6 5 8 1 0 22 NNE 3 2 4 0 0 0 9 NE 5 2 10 1 0 0 18 ENE 1 3 11 0 0 0 15 E 4 4 8 1 1 1 19 ESE 0 13 7 2 0 0 22 SE 3 8 11 7 1 0 30 SSE 5 15 33 9 0 0 62 S 5 19 59 22 4 0 109 SSW 5 22 31 9 0 0 67 SW 4 17 17 8 3 0 49 WSW 4 6 9 7 0 0 26 W 1 1 9 17 3 0 31 WNW 7 7 15 27 4 0 60 NW 2 10 45 21 5 0 83 NNW 2 11 12 9 4 0 38 Variable 0 0 0 0 0 0 0 Total 53 146 286 148 26 1 660 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 68 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Moderately Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 4 1 0 0 0 7 NNE 1 0 1 0 0 0 2 NE 1 3 2 0 0 0 6 ENE 1 1 0 0 0 0 2 E 1 2 0 0 0 0 3 ESE 0 1 0 0 0 0 1 SE 0 4 3 0 0 0 7 SSE 1 2 1 0 0 0 4 S 0 1 2 0 0 0 3 SSW 3 1 4 0 0 0 8 SW 0 8 7 8 0 0 23 WSW 1 5 7 8 0 0 21 W 1 1 3 6 2 0 13 WNW 4 0 3 7 0 0 14 NW 1 2 12 4 0 0 19 NNW 1 5 4 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 18 40 50 33 2 0 143 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 69 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: April - June 2024 Stability Class - Extremely Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 2 0 0 0 4 NNE 1 3 0 0 0 0 4 NE 1 1 1 0 0 0 3 ENE 1 0 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 1 0 0 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 1 1 0 0 0 0 2 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 1 0 0 0 1 W 0 1 0 1 0 0 2 WNW 1 0 1 0 0 0 2 NW 1 1 3 2 0 0 7 NNW 1 5 4 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 8 14 12 3 0 0 37 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3

Annual Radioactive Effluent Release Report YEAR: 2024 Page 70 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Extremely Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 13 15 2 0 0 0 30 NNE 18 17 0 0 0 0 35 NE 21 1 0 0 0 0 22 ENE 27 1 0 0 0 0 28 E 30 2 0 0 0 0 32 ESE 21 3 0 0 0 0 24 SE 6 23 0 0 0 0 29 SSE 0 41 10 3 0 0 54 S 2 9 16 2 0 0 29 SSW 0 2 5 0 0 0 7 SW 2 2 0 0 0 0 4 WSW 4 6 1 0 0 0 11 W 1 6 3 0 0 0 10 WNW 2 4 2 0 0 0 8 NW 2 1 0 0 0 0 3 NNW 4 13 8 0 0 0 25 Variable 0 0 0 0 0 0 0 Total 153 146 47 5 0 0 351 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 71 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Moderately Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 7 8 1 0 0 0 16 NNE 5 7 0 0 0 0 12 NE 19 0 0 0 0 0 19 ENE 10 1 0 0 0 0 11 E 6 0 0 0 0 0 6 ESE 4 3 0 0 0 0 7 SE 1 3 0 0 0 0 4 SSE 5 13 3 0 0 0 21 S 1 17 6 1 0 0 25 SSW 1 2 1 0 0 0 4 SW 1 13 2 0 0 0 16 WSW 1 8 3 0 0 0 12 W 4 11 0 0 0 0 15 WNW 1 14 1 0 0 0 16 NW 2 7 3 0 0 0 12 NNW 3 21 11 0 0 0 35 Variable 0 0 0 0 0 0 0 Total 71 128 31 1 0 0 231 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 72 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Slightly Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 3 1 0 0 0 10 NNE 2 1 0 0 0 0 3 NE 4 0 0 0 0 0 4 ENE 7 0 0 0 0 0 7 E 3 0 0 0 0 0 3 ESE 2 0 0 0 0 0 2 SE 0 4 1 0 0 0 5 SSE 2 4 2 0 0 0 8 S 1 7 2 0 0 0 10 SSW 2 1 0 0 0 0 3 SW 0 1 0 0 0 0 1 WSW 1 3 0 0 0 0 4 W 1 2 0 0 0 0 3 WNW 2 6 1 0 0 0 9 NW 2 3 0 0 0 0 5 NNW 1 15 4 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 36 50 11 0 0 0 97 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 73 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Neutral - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 33 11 6 0 0 0 50 NNE 50 2 0 0 0 0 52 NE 18 0 0 0 0 0 18 ENE 13 0 0 0 0 0 13 E 15 0 0 0 0 0 15 ESE 10 8 0 0 0 0 18 SE 14 23 6 3 0 0 46 SSE 17 56 9 3 0 0 85 S 13 30 7 0 0 0 50 SSW 15 10 2 0 0 0 27 SW 11 6 1 0 0 0 18 WSW 13 10 2 0 0 0 25 W 9 5 0 0 0 0 14 WNW 16 12 0 0 0 0 28 NW 14 15 1 1 0 0 31 NNW 15 19 23 0 0 0 57 Variable 0 0 0 0 0 0 0 Total 276 207 57 7 0 0 547 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 74 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Slightly Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 22 17 0 0 0 0 39 NNE 27 0 0 0 0 0 27 NE 20 0 0 0 0 0 20 ENE 16 0 0 0 0 0 16 E 12 0 0 0 0 0 12 ESE 10 0 0 0 0 0 10 SE 16 11 1 0 0 0 28 SSE 35 41 2 0 0 0 78 S 43 33 1 0 0 0 77 SSW 33 12 0 0 0 0 45 SW 33 11 3 0 0 0 47 WSW 39 10 0 0 0 0 49 W 40 13 0 0 0 0 53 WNW 29 19 0 0 0 0 48 NW 24 24 1 0 0 0 49 NNW 22 18 2 0 0 0 42 Variable 0 0 0 0 0 0 0 Total 421 209 10 0 0 0 640 Hours of calm in this stability class: 8 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 75 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Moderately Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 0 0 0 0 0 4 NNE 1 0 0 0 0 0 1 NE 1 0 0 0 0 0 1 ENE 1 0 0 0 0 0 1 E 3 0 0 0 0 0 3 ESE 3 0 0 0 0 0 3 SE 2 1 0 0 0 0 3 SSE 6 0 0 0 0 0 6 S 4 2 0 0 0 0 6 SSW 4 0 0 0 0 0 4 SW 16 2 0 0 0 0 18 WSW 25 8 0 0 0 0 33 W 35 11 0 0 0 0 46 WNW 18 5 0 0 0 0 23 NW 10 5 0 0 0 0 15 NNW 9 1 0 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 142 35 0 0 0 0 177 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 76 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Extremely Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 1 0 0 0 0 0 1 SW 23 15 0 0 0 0 38 WSW 55 23 0 0 0 0 78 W 21 7 0 0 0 0 28 WNW 3 1 0 0 0 0 4 NW 3 1 0 0 0 0 4 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 106 47 0 0 0 0 153 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 77 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Extremely Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 3 0 0 0 3 ENE 1 1 5 0 0 0 7 E 0 17 3 2 0 0 22 ESE 0 1 2 1 0 0 4 SE 0 2 2 0 0 0 4 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 1 21 15 3 0 0 40 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 78 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Moderately Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 2 0 0 0 2 NNE 0 3 4 0 0 0 7 NE 0 4 2 0 0 0 6 ENE 0 4 2 0 0 0 6 E 0 13 2 0 0 0 15 ESE 0 3 3 0 0 0 6 SE 0 3 3 0 0 0 6 SSE 0 0 0 2 0 0 2 S 0 0 0 0 0 0 0 SSW 0 0 0 1 0 0 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 30 18 3 0 0 51 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 79 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Slightly Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 4 0 0 0 5 NNE 0 8 2 0 0 0 10 NE 2 3 0 0 0 0 5 ENE 4 2 3 0 0 0 9 E 4 11 2 0 0 0 17 ESE 0 4 0 2 0 0 6 SE 0 3 4 0 0 0 7 SSE 0 1 4 6 3 0 14 S 0 1 3 5 0 0 9 SSW 0 0 0 0 0 0 0 SW 0 0 1 0 0 0 1 WSW 0 0 2 0 0 0 2 W 0 0 3 1 0 0 4 WNW 0 0 1 0 0 0 1 NW 0 1 0 1 0 0 2 NNW 0 1 4 4 3 0 12 Variable 0 0 0 0 0 0 0 Total 10 36 33 19 6 0 104 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 80 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Neutral - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 7 9 8 0 0 28 NNE 4 7 6 1 0 0 18 NE 6 10 36 3 0 0 55 ENE 11 26 40 4 0 0 81 E 7 18 40 9 0 0 74 ESE 4 22 23 26 1 0 76 SE 3 25 37 12 7 2 86 SSE 4 21 30 10 1 1 67 S 6 14 52 18 6 1 97 SSW 1 7 13 5 2 0 28 SW 4 8 18 2 0 0 32 WSW 2 11 18 1 0 0 32 W 3 15 28 3 0 0 49 WNW 1 11 17 6 1 0 36 NW 0 25 31 25 4 0 85 NNW 6 25 18 17 5 0 71 Variable 0 0 0 0 0 0 0 Total 66 252 416 150 27 4 915 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 81 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Slightly Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 5 27 6 0 0 40 NNE 1 7 10 0 0 0 18 NE 1 8 13 4 0 0 26 ENE 8 23 22 2 0 0 55 E 3 19 30 13 0 0 65 ESE 2 20 10 8 0 0 40 SE 5 16 33 12 1 0 67 SSE 3 13 44 18 0 0 78 S 3 19 52 31 1 0 106 SSW 2 19 37 6 0 0 64 SW 3 23 19 5 5 0 55 WSW 3 15 9 5 0 0 32 W 1 15 8 7 3 0 34 WNW 3 10 16 8 0 0 37 NW 4 10 17 18 1 1 51 NNW 4 6 19 19 0 0 48 Variable 0 0 0 0 0 0 0 Total 48 228 366 162 11 1 816 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 82 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Moderately Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 3 6 0 0 0 13 NNE 2 3 5 0 0 0 10 NE 2 3 7 0 0 0 12 ENE 1 12 1 0 0 0 14 E 1 0 0 0 0 0 1 ESE 3 1 0 0 0 0 4 SE 2 3 0 0 0 0 5 SSE 0 1 1 0 0 0 2 S 0 2 4 2 0 0 8 SSW 0 5 4 1 0 0 10 SW 3 6 1 0 0 0 10 WSW 0 6 5 5 0 0 16 W 1 3 11 1 0 0 16 WNW 1 8 2 4 0 0 15 NW 4 10 8 5 0 0 27 NNW 1 4 17 1 0 0 23 Variable 0 0 0 0 0 0 0 Total 25 70 72 19 0 0 186 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 83 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: July - September 2024 Stability Class - Extremely Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 5 1 0 0 0 6 NNE 2 4 1 0 0 0 7 NE 0 7 3 0 0 0 10 ENE 2 2 0 0 0 0 4 E 0 3 0 0 0 0 3 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 1 0 0 0 0 1 SSW 0 0 0 0 0 0 0 SW 0 3 0 1 0 0 4 WSW 1 2 2 1 0 0 6 W 2 6 2 5 0 0 15 WNW 0 8 1 7 0 0 16 NW 1 0 4 0 0 0 5 NNW 3 9 5 0 0 0 17 Variable 0 0 0 0 0 0 0 Total 11 50 19 14 0 0 94 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0

Annual Radioactive Effluent Release Report YEAR: 2024 Page 84 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Extremely Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 10 4 0 0 0 14 NNE 3 4 0 0 0 0 7 NE 13 1 0 0 0 0 14 ENE 15 0 0 0 0 0 15 E 11 5 0 0 0 0 16 ESE 6 12 0 0 0 0 18 SE 4 6 0 0 0 0 10 SSE 0 11 5 0 0 0 16 S 0 9 13 0 0 0 22 SSW 0 5 3 0 0 0 8 SW 0 4 5 0 0 0 9 WSW 1 3 5 0 0 0 9 W 0 3 1 0 0 0 4 WNW 0 1 3 2 0 0 6 NW 1 0 6 4 0 0 11 NNW 0 1 10 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 54 75 55 6 0 0 190 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 85 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Moderately Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 8 0 0 0 0 10 NNE 4 6 0 0 0 0 10 NE 4 0 0 0 0 0 4 ENE 4 0 0 0 0 0 4 E 11 1 0 0 0 0 12 ESE 7 1 0 0 0 0 8 SE 0 3 2 0 0 0 5 SSE 0 5 0 0 0 0 5 S 0 1 5 1 0 0 7 SSW 0 2 3 0 0 0 5 SW 1 1 4 0 0 0 6 WSW 0 2 4 1 0 0 7 W 0 2 12 8 1 0 23 WNW 2 2 12 3 0 0 19 NW 0 5 15 4 0 0 24 NNW 0 16 29 6 0 0 51 Variable 0 0 0 0 0 0 0 Total 35 55 86 23 1 0 200 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 86 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Slightly Unstable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 2 0 0 0 0 0 2 NE 4 0 0 0 0 0 4 ENE 7 0 0 0 0 0 7 E 3 1 0 0 0 0 4 ESE 2 1 0 0 0 0 3 SE 1 1 1 0 0 0 3 SSE 1 2 2 2 0 0 7 S 0 2 2 0 0 0 4 SSW 1 0 0 0 0 0 1 SW 0 0 0 0 0 0 0 WSW 0 1 4 1 0 0 6 W 0 2 4 7 0 0 13 WNW 0 3 3 2 0 0 8 NW 1 6 7 5 0 0 19 NNW 1 13 15 6 0 0 35 Variable 0 0 0 0 0 0 0 Total 23 33 38 23 0 0 117 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 87 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Neutral - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 21 15 11 0 0 0 47 NNE 34 4 0 0 0 0 38 NE 34 0 0 0 0 0 34 ENE 34 1 0 0 0 0 35 E 18 8 0 0 0 0 26 ESE 9 6 1 0 0 0 16 SE 11 22 2 1 0 0 36 SSE 11 23 5 2 0 0 41 S 5 22 15 0 0 0 42 SSW 2 5 3 1 0 0 11 SW 5 11 9 0 0 0 25 WSW 4 17 13 4 0 0 38 W 3 16 40 4 0 0 63 WNW 2 34 34 6 0 0 76 NW 4 41 62 5 0 0 112 NNW 9 41 36 2 0 0 88 Variable 0 0 0 0 0 0 0 Total 206 266 231 25 0 0 728 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 88 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Slightly Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 20 3 0 0 0 0 23 NNE 19 2 0 0 0 0 21 NE 23 0 0 0 0 0 23 ENE 12 1 0 0 0 0 13 E 17 2 0 0 0 0 19 ESE 18 0 0 0 0 0 18 SE 20 6 0 0 0 0 26 SSE 16 18 0 0 0 0 34 S 16 23 1 0 0 0 40 SSW 9 11 1 0 0 0 21 SW 17 15 6 0 0 0 38 WSW 22 42 3 0 0 0 67 W 28 69 10 0 0 0 107 WNW 27 46 2 0 0 0 75 NW 14 47 6 0 0 0 67 NNW 12 19 0 0 0 0 31 Variable 0 0 0 0 0 0 0 Total 290 304 29 0 0 0 623 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 89 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Moderately Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 0 0 0 0 0 2 NNE 3 0 0 0 0 0 3 NE 2 0 0 0 0 0 2 ENE 5 0 0 0 0 0 5 E 10 0 0 0 0 0 10 ESE 9 0 0 0 0 0 9 SE 9 0 0 0 0 0 9 SSE 3 1 0 0 0 0 4 S 3 0 0 0 0 0 3 SSW 10 0 0 0 0 0 10 SW 12 0 0 0 0 0 12 WSW 20 33 0 0 0 0 53 W 9 9 0 0 0 0 18 WNW 22 6 0 0 0 0 28 NW 7 6 0 0 0 0 13 NNW 4 1 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 130 56 0 0 0 0 186 Hours of calm in this stability class: 4 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 90 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Extremely Stable - 150Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 0 0 0 0 0 3 NNE 1 0 0 0 0 0 1 NE 1 0 0 0 0 0 1 ENE 0 0 0 0 0 0 0 E 8 0 0 0 0 0 8 ESE 3 0 0 0 0 0 3 SE 4 0 0 0 0 0 4 SSE 0 0 0 0 0 0 0 S 3 1 0 0 0 0 4 SSW 5 0 0 0 0 0 5 SW 28 5 0 0 0 0 33 WSW 49 15 0 0 0 0 64 W 8 9 0 0 0 0 17 WNW 4 0 0 0 0 0 4 NW 2 0 0 0 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 119 30 0 0 0 0 149 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 91 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Extremely Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 3 0 0 0 3 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 3 0 0 0 3 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 92 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Moderately Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 0 0 0 0 2 NNE 0 0 0 0 0 0 0 NE 0 2 0 0 0 0 2 ENE 0 0 0 1 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 2 1 0 0 3 SE 0 0 0 1 0 0 1 SSE 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 4 2 3 0 0 9 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 93 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Slightly Unstable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 0 1 2 0 0 4 NNE 0 2 1 0 0 0 3 NE 0 3 0 0 0 0 3 ENE 1 1 0 1 0 0 3 E 0 2 1 0 0 0 3 ESE 0 0 3 2 0 0 5 SE 0 0 0 0 0 0 0 SSE 0 0 2 0 0 0 2 S 0 0 3 3 0 0 6 SSW 0 0 0 2 0 0 2 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 W 0 0 0 0 0 1 1 WNW 0 0 0 2 0 0 2 NW 0 0 1 2 0 0 3 NNW 0 1 0 1 0 0 2 Variable 0 0 0 0 0 0 0 Total 2 9 12 15 0 1 39 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 94 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Neutral - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 10 9 24 1 0 45 NNE 5 4 3 15 0 0 27 NE 7 6 11 24 0 0 48 ENE 5 12 13 17 0 0 47 E 2 9 13 16 0 0 40 ESE 3 10 6 14 3 0 36 SE 1 8 12 9 8 2 40 SSE 1 8 21 8 0 8 46 S 0 4 18 29 3 2 56 SSW 1 2 4 10 3 0 20 SW 0 2 14 17 1 1 35 WSW 0 1 8 16 22 6 53 W 0 6 17 42 33 22 120 WNW 1 5 15 38 32 11 102 NW 1 19 40 73 60 15 208 NNW 2 10 19 36 18 0 85 Variable 0 0 0 0 0 0 0 Total 30 116 223 388 184 67 1008 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 95 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Slightly Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 6 27 7 0 0 43 NNE 3 1 8 11 0 0 23 NE 1 4 2 7 0 0 14 ENE 0 5 7 11 0 0 23 E 1 9 6 11 0 0 27 ESE 3 13 5 14 2 0 37 SE 3 16 11 20 1 0 51 SSE 2 8 17 31 8 0 66 S 1 9 26 41 9 1 87 SSW 1 7 14 20 6 0 48 SW 4 5 7 15 8 1 40 WSW 1 5 13 17 8 0 44 W 1 3 23 57 14 1 99 WNW 0 3 19 40 9 1 72 NW 1 5 27 61 11 0 105 NNW 1 4 27 28 1 0 61 Variable 0 0 0 0 0 0 0 Total 26 103 239 391 77 4 840 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 96 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Moderately Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 1 2 0 0 0 4 NNE 0 0 2 0 0 0 2 NE 0 2 0 0 0 0 2 ENE 1 1 0 0 0 0 2 E 2 1 1 0 0 0 4 ESE 1 6 4 0 0 0 11 SE 0 3 3 5 0 0 11 SSE 0 5 1 1 1 0 8 S 2 5 5 3 0 0 15 SSW 1 4 6 5 0 0 16 SW 0 2 3 2 0 0 7 WSW 1 4 18 8 1 0 32 W 3 9 14 5 1 0 32 WNW 0 3 7 6 1 0 17 NW 0 5 5 8 0 0 18 NNW 1 3 7 3 0 0 14 Variable 0 0 0 0 0 0 0 Total 13 54 78 46 4 0 195 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 97 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station Period of Record: October - December2024 Stability Class - Extremely Stable - 316Ft-33Ft Delta-T (F)

Winds Measured at 320 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 5 2 0 0 0 7 NNE 2 0 0 0 0 0 2 NE 0 1 0 0 0 0 1 ENE 1 0 1 0 0 0 2 E 0 1 0 2 0 0 3 ESE 0 1 0 0 0 0 1 SE 0 3 2 5 0 0 10 SSE 0 3 1 0 0 0 4 S 0 2 0 0 0 0 2 SSW 0 1 1 0 0 0 2 SW 3 4 4 2 0 0 13 WSW 2 0 10 4 0 0 16 W 2 4 4 1 0 0 11 WNW 0 13 10 0 0 0 23 NW 0 3 1 3 0 0 7 NNW 3 0 1 1 0 0 5 Variable 0 0 0 0 0 0 0 Total 13 41 37 18 0 0 109 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 4

Annual Radioactive Effluent Release Report YEAR: 2024 Page 98 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station January-December 2024 33 ft. Wind Speed and Direction 150Ft-33Ft Delta-T (F)

Number of Observations = 8725 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 A N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 L SS 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.08 0.08 M MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.02 0.02 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 EU 0.19 0.33 0.47 0.94 0.85 0.48 0.15 0.02 0.03 0.00 0.02 0.07 0.01 0.03 0.03 0.10 3.75 3.75 MU 0.16 0.17 0.32 0.42 0.42 0.24 0.13 0.07 0.01 0.01 0.02 0.01 0.06 0.03 0.02 0.10 2.21 2.21 1 SU 0.13 0.09 0.15 0.32 0.18 0.09 0.08 0.03 0.02 0.03 0.02 0.03 0.02 0.02 0.06 0.05 1.34 1.34

- N 0.92 1.31 1.23 1.23 1.10 0.56 0.65 0.72 0.47 0.32 0.33 0.31 0.22 0.31 0.34 0.45 10.46 10.46 3 SS 0.74 0.93 0.80 0.61 0.79 0.99 0.78 1.24 1.20 0.88 0.79 0.99 1.18 1.15 0.92 0.71 14.69 14.69 MS 0.16 0.14 0.08 0.25 0.33 0.32 0.22 0.14 0.16 0.30 0.60 0.83 0.73 0.68 0.32 0.25 5.50 5.50 ES 0.08 0.05 0.09 0.03 0.13 0.05 0.08 0.05 0.08 0.11 0.69 1.38 0.54 0.18 0.16 0.07 3.76 3.76 41.72 EU 0.46 0.60 0.15 0.14 0.45 0.50 0.69 0.78 0.45 0.16 0.13 0.14 0.11 0.11 0.08 0.29 5.23 5.23 MU 0.36 0.36 0.09 0.06 0.15 0.13 0.16 0.32 0.41 0.11 0.21 0.15 0.21 0.25 0.19 0.62 3.77 3.77 4 SU 0.18 0.11 0.02 0.10 0.13 0.11 0.11 0.14 0.14 0.05 0.02 0.08 0.14 0.17 0.16 0.56 2.23 2.23

- N 0.85 0.38 0.08 0.16 0.40 0.57 1.09 2.26 1.15 0.44 0.44 0.48 0.66 1.21 1.38 1.67 13.21 13.21 7 SS 0.30 0.03 0.00 0.01 0.07 0.07 0.38 1.02 1.09 0.48 0.55 1.15 2.06 1.30 1.38 0.77 10.65 10.65 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.01 0.06 0.74 0.47 0.16 0.19 0.06 1.74 1.74 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.28 0.57 0.26 0.02 0.01 0.00 1.16 1.16 37.99 EU 0.09 0.00 0.00 0.00 0.00 0.06 0.02 0.29 0.69 0.17 0.14 0.08 0.17 0.29 0.24 0.48 2.72 2.72 MU 0.07 0.00 0.02 0.00 0.01 0.00 0.10 0.19 0.24 0.11 0.13 0.15 0.37 0.34 0.41 0.86 3.01 3.01 8 SU 0.05 0.00 0.00 0.00 0.01 0.01 0.05 0.10 0.13 0.00 0.05 0.11 0.10 0.10 0.33 0.45 1.49 1.49

- N 0.41 0.02 0.00 0.00 0.06 0.13 0.34 0.61 0.62 0.14 0.23 0.34 0.78 1.11 1.70 1.64 8.13 8.13 1 SS 0.02 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.14 0.01 0.13 0.07 0.26 0.07 0.21 0.05 0.99 0.99 2 MS 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 16.34 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.03 0.07 0.00 0.01 0.02 0.01 0.11 0.09 0.05 0.42 0.42 1 MU 0.00 0.00 0.00 0.00 0.00 0.03 0.05 0.00 0.07 0.00 0.06 0.02 0.16 0.15 0.24 0.17 0.95 0.95 3 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.00 0.00 0.00 0.05 0.13 0.05 0.17 0.10 0.53 0.53

- N 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.07 0.00 0.01 0.05 0.24 0.28 0.32 0.37 0.23 1.65 1.65 1 SS 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 8 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.56

Annual Radioactive Effluent Release Report YEAR: 2024 Page 99 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station January-December 2024 33 ft. Wind Speed and Direction 150Ft-33Ft Delta-T (F)

SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.02 0.00 0.03 0.03 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.02 0.02

- N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.01 0.00 0.05 0.09 0.09 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 TOT 5.17 4.52 3.51 4.33 5.08 4.34 5.23 8.15 7.22 3.36 4.93 8.02 9.01 8.19 9.07 9.77 99.89 12.13 9.98 5.62 33.55 26.42 7.28 4.92 99.89 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.74 0.93 0.62 1.09 1.30 1.04 0.88 1.12 1.24 0.33 0.30 0.31 0.31 0.55 0.45 0.92 12.13 Extremely Unstable 0.58 0.53 0.44 0.48 0.58 0.40 0.44 0.58 0.73 0.24 0.41 0.33 0.80 0.78 0.89 1.75 9.98 Moderately Unstable 0.36 0.21 0.17 0.42 0.32 0.22 0.25 0.30 0.29 0.08 0.09 0.28 0.41 0.34 0.72 1.16 5.62 Slightly Unstable 2.18 1.71 1.31 1.39 1.56 1.26 2.18 3.66 2.23 0.91 1.04 1.38 1.97 2.97 3.78 4.03 33.55 Neutral 1.07 0.96 0.80 0.65 0.86 1.05 1.17 2.29 2.44 1.38 1.47 2.20 3.51 2.51 2.53 1.52 26.42 Slightly Stable 0.16 0.14 0.08 0.26 0.33 0.32 0.23 0.15 0.19 0.31 0.65 1.58 1.20 0.84 0.52 0.31 7.28 Moderately Stable 0.08 0.05 0.09 0.03 0.13 0.05 0.08 0.05 0.09 0.11 0.96 1.95 0.80 0.21 0.17 0.07 4.92 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 C A L M 2.38 3.01 3.14 3.81 3.81 2.73 2.09 2.27 1.98 1.66 2.48 3.61 2.76 2.41 1.86 1.73 41.72 < 3.5 mph 2.14 1.48 0.34 0.47 1.19 1.39 2.44 4.53 3.27 1.25 1.67 3.31 3.92 3.23 3.39 3.97 37.99 3.6 - 7.5 mph 0.64 0.02 0.02 0.01 0.08 0.19 0.53 1.21 1.81 0.44 0.66 0.76 1.68 1.91 2.89 3.47 16.34 7.6 - 12.5 mph 0.00 0.00 0.00 0.01 0.00 0.03 0.17 0.13 0.14 0.01 0.11 0.33 0.57 0.63 0.87 0.55 3.56 12.6 - 18.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.01 0.02 0.05 0.15 18.6 - 24.5 mph 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 > 24.5 mph

Annual Radioactive Effluent Release Report YEAR: 2024 Page 100 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station January-December 2024 320 ft. Wind Speed and Direction 316Ft-33Ft Delta-T (F)

Number of Observations = 8763 Values are Percent Occurrence SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 A N 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 L SS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 M MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 EU 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 MU 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 1 SU 0.01 0.00 0.05 0.06 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.16

- N 0.09 0.16 0.26 0.37 0.22 0.21 0.10 0.10 0.13 0.03 0.09 0.09 0.06 0.03 0.07 0.13 2.13 2.13 3 SS 0.10 0.11 0.13 0.23 0.14 0.09 0.14 0.14 0.10 0.11 0.13 0.11 0.05 0.17 0.13 0.10 1.97 1.97 MS 0.08 0.05 0.05 0.03 0.08 0.06 0.05 0.01 0.03 0.06 0.03 0.06 0.07 0.06 0.08 0.03 0.82 0.82 ES 0.00 0.07 0.01 0.05 0.00 0.01 0.00 0.00 0.01 0.00 0.03 0.06 0.05 0.01 0.03 0.08 0.41 0.41 5.52 EU 0.00 0.01 0.05 0.02 0.37 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.49 0.49 MU 0.05 0.07 0.09 0.07 0.27 0.16 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.75 0.75 4 SU 0.05 0.15 0.11 0.07 0.22 0.14 0.03 0.01 0.03 0.00 0.00 0.00 0.01 0.02 0.01 0.03 0.89 0.89

- N 0.62 0.43 0.46 0.82 0.80 1.06 0.89 0.59 0.68 0.27 0.33 0.29 0.35 0.37 0.94 0.99 9.89 9.89 7 SS 0.35 0.30 0.26 0.50 0.47 0.78 0.67 0.50 0.70 0.62 0.54 0.35 0.25 0.26 0.32 0.33 7.20 7.20 MS 0.16 0.09 0.13 0.22 0.07 0.13 0.16 0.09 0.10 0.17 0.30 0.25 0.17 0.15 0.21 0.14 2.52 2.52 ES 0.14 0.09 0.10 0.02 0.05 0.01 0.03 0.03 0.05 0.03 0.13 0.05 0.13 0.25 0.06 0.21 1.37 1.37 23.12 EU 0.00 0.01 0.06 0.07 0.05 0.19 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.43 0.43 MU 0.03 0.09 0.02 0.02 0.02 0.13 0.10 0.00 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.48 0.48 8 SU 0.07 0.07 0.00 0.05 0.03 0.08 0.15 0.15 0.26 0.02 0.02 0.02 0.03 0.05 0.06 0.11 1.18 1.18

- N 0.80 0.42 0.88 0.96 1.10 0.92 1.68 1.37 1.68 0.54 0.63 0.52 0.76 0.76 1.60 1.30 15.92 15.92 1 SS 0.81 0.30 0.33 0.54 0.62 0.48 0.88 1.20 1.88 1.06 0.59 0.46 0.55 0.73 1.37 1.03 12.82 12.82 2 MS 0.10 0.13 0.11 0.03 0.01 0.08 0.18 0.06 0.13 0.21 0.22 0.43 0.35 0.16 0.33 0.32 2.85 2.85 ES 0.07 0.01 0.05 0.01 0.00 0.00 0.02 0.01 0.00 0.02 0.17 0.19 0.15 0.16 0.16 0.14 1.16 1.16 34.84 EU 0.00 0.00 0.01 0.00 0.05 0.07 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 0.16 1 MU 0.00 0.00 0.00 0.01 0.01 0.02 0.05 0.02 0.03 0.01 0.00 0.02 0.01 0.00 0.00 0.00 0.19 0.19 3 SU 0.03 0.00 0.00 0.01 0.00 0.05 0.03 0.07 0.16 0.03 0.02 0.03 0.10 0.17 0.13 0.07 0.91 0.91

- N 0.83 0.27 0.40 0.31 0.58 1.05 0.89 0.58 1.27 0.25 0.49 0.42 0.97 1.68 2.45 1.35 13.80 13.80 1 SS 0.29 0.15 0.15 0.15 0.30 0.34 0.46 0.68 1.21 0.46 0.48 0.55 1.06 1.36 1.47 0.75 9.85 9.85 8 MS 0.00 0.00 0.00 0.00 0.00 0.01 0.07 0.01 0.06 0.07 0.13 0.31 0.19 0.24 0.21 0.05 1.34 1.34 ES 0.00 0.00 0.00 0.00 0.02 0.00 0.06 0.00 0.00 0.00 0.03 0.09 0.15 0.08 0.07 0.02 0.52 0.52 26.77

Annual Radioactive Effluent Release Report YEAR: 2024 Page 101 of 101 Company: Constellation Energy Generation Plant:

Peach Bottom Clean Energy Center, Meteorological Data Peach Bottom Nuclear Station January-December 2024 320 ft. Wind Speed and Direction 316Ft-33Ft Delta-T (F)

SPEED ---------------------------------- WIND DIRECTION CLASSES ---------------------------------- --------- STABILITY CLASSES ----------

CLASS N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL EU MU SU N SS MS ES TOTAL EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9 SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.05 0.00 0.01 0.00 0.01 0.09 0.02 0.05 0.26 0.26

- N 0.05 0.00 0.05 0.00 0.07 0.22 0.25 0.07 0.24 0.09 0.10 0.40 0.70 1.06 1.47 0.50 5.26 5.26 2 SS 0.01 0.00 0.00 0.00 0.01 0.02 0.03 0.09 0.24 0.10 0.18 0.14 0.32 0.26 0.26 0.09 1.77 1.77 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.01 0.03 0.01 0.00 0.00 0.07 0.07 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 7.36 EU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 G MU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 T SU 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.07 0.00 0.00 0.09 0.09 N 0.00 0.00 0.00 0.00 0.00 0.09 0.15 0.10 0.05 0.00 0.02 0.29 0.57 0.47 0.35 0.06 2.15 2.15 2 SS 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.01 0.02 0.00 0.01 0.00 0.01 0.01 0.01 0.00 0.10 0.10 4 MS 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 ES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.34 TOT 4.74 2.99 3.74 4.63 5.59 6.42 7.23 5.96 9.16 4.17 4.69 5.15 7.13 8.68 11.80 7.89 99.98 1.10 1.44 3.49 49.15 33.72 7.60 3.48 99.98 Wind Direction by Stability N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -STABILITY CLASSES-0.00 0.02 0.11 0.10 0.46 0.29 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.10 Extremely Unstable 0.08 0.16 0.11 0.11 0.31 0.31 0.19 0.02 0.09 0.01 0.00 0.02 0.01 0.00 0.00 0.00 1.44 Moderately Unstable 0.16 0.22 0.16 0.18 0.30 0.26 0.22 0.26 0.50 0.06 0.06 0.06 0.18 0.40 0.22 0.26 3.49 Slightly Unstable 2.39 1.29 2.04 2.45 2.76 3.55 3.96 2.82 4.04 1.19 1.67 2.01 3.41 4.37 6.88 4.33 49.15 Neutral 1.56 0.86 0.87 1.42 1.54 1.72 2.18 2.62 4.15 2.35 1.93 1.61 2.24 2.80 3.56 2.32 33.72 Slightly Stable 0.34 0.26 0.29 0.29 0.16 0.27 0.46 0.18 0.32 0.50 0.67 1.06 0.82 0.62 0.82 0.54 7.60 Moderately Stable 0.21 0.18 0.16 0.08 0.07 0.02 0.11 0.05 0.06 0.06 0.37 0.39 0.47 0.50 0.32 0.45 3.48 Extremely Stable Wind Direction by Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL -WIND SPEED CLASSES-0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 C A L M 0.29 0.39 0.49 0.75 0.48 0.37 0.29 0.25 0.27 0.21 0.29 0.32 0.22 0.27 0.31 0.34 5.52 < 3.5 mph 1.36 1.14 1.20 1.72 2.24 2.29 1.86 1.23 1.56 1.10 1.29 0.94 0.91 1.05 1.53 1.70 23.12 3.6 - 7.5 mph 1.88 1.03 1.45 1.68 1.83 1.88 3.07 2.78 4.01 1.85 1.63 1.63 1.85 1.86 3.51 2.90 34.84 7.6 - 12.5 mph 1.15 0.42 0.56 0.48 0.96 1.54 1.59 1.37 2.73 0.82 1.15 1.43 2.49 3.53 4.33 2.24 26.77 12.6 - 18.5 mph 0.06 0.00 0.05 0.00 0.08 0.24 0.29 0.21 0.52 0.19 0.30 0.55 1.06 1.43 1.76 0.64 7.36 18.6 - 24.5 mph 0.00 0.00 0.00 0.00 0.01 0.10 0.15 0.11 0.07 0.00 0.03 0.29 0.60 0.55 0.37 0.06 2.34 > 24.5 mph

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