Text

Submittal of 2020 Annual Radiological Effluent Release Report
	ML21119A129
Person / Time
Site:	Crane
Issue date:	04/27/2021
From:	Orth T; Exelon Generation Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	TMI-21-017
	Download: ML21119A129 (54)
	v • d • e

Three Mile Island Nuclear Station, Unit 1 441 S. P.O. Box 480 Middletown, PA 17057 TMI-21-017 April 27, 2021 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Three Mile Island Nuclear Station, Unit 1 Renewed Facility License No. DPR-50 NRC Docket Nos. 50-289 Three Mile Island Nuclear Station, Unit 2 Possession Only License No. DPR-73 NRC Docket No. 50-320

Subject:

2020 Annual Radiological Effluent Release Report The 2020 Annual Radioactive Effluent Release Reports required by TMI-1 Technical Specification (TMI-1 TS) 6.9.3.1, TMI-2 Technical Specifications (TMI-2 TS) 6.8.1.2, and Offsite Dose Calculation Manual with description of changes and approval paper required by TM-1 TS 6.14.11 and TMI-2 6.12, are attached. provides the 2020 Annual Radioactive Effluent Release Report with eleven attachments as follows.

contains a summary of the quantities of radioactive liquid and gaseous effluents released from the site as out lined in Reg. Guide 1.21, Rev. 1, with data summarized on a quarterly basis following the format of Appendix B thereof.

contains information for each type of solid waste shipped offsite during the report period including the container volume, total curie quantity, principal radionuclides and type of waste.

includes a summary of unplanned releases from the site to unrestricted areas of radioactive materials in gaseous and liquid effluents made during the reporting period.

describes any changes made during 2020 to the Process Control Program (PCP) documents or to the Offsite Dose Calculation Manual (ODCM) and a listing of new locations for dose calculations and/or environmental monitoring identified by the land use census pursuant to Part 3, Section 8.2 of the ODCM.

TMI-21-017 April 27, 2021 U.S. Nuclear Regulatory Commission Page 2

reports all instrumentation not returned to operable status within 30 days per the TMI ODCM Part 1, Sections 2.1.1.b and 2.1.2.b, and Part 2, Section 2.1.2.b.

is quarterly summaries of hourly meteorological data collected for 2020 in the form of joint frequency distribution of wind speed, wind direction and atmospheric stability.

is an assessment of the radiation doses due to the radioactive liquid and gaseous effluents released from the respective unit during 2020.

is an assessment of the radiation doses from the radioactive liquid and gaseous effluents to members of the public due to their activities inside the site boundary during 2020.

is an assessment of the radiation doses to the most likely exposed real individual from reactor releases and other nearby uranium fuel cycle sources including doses from primary effluent pathways and direct radiation for 2020.

0 is a summation of deviations from the sampling and analysis regime specified in the ODCM for TMI-1 and TMI-2.

1 is a summary of Major Changes to Radioactive Waste Treatment Systems IAW FSAR Section 11.2.6.

TMI Process Control Program, RW-AA-100, Revision 12 was not revised in 2020.

There are no commitments in this letter.

Should you have any questions concerning this letter, please contact Mr. Daniel Jordan, Chemistry/Environmental Specialist, at (717) 948-8470.

Respectfully, Trevor L. Orth Site Decommissioning Director Three Mile Island Nuclear Station, Unit 1

TMI-21-017 April 27, 2021 U.S. Nuclear Regulatory Commission Page 3

Enclosure:

1.

Three Mile Island 2020 Annual Radioactive Effluent Release Report cc: w/ Enclosure Regional Administrator - NRC Region I NRC Project Manager, NMSS - Three Mile Island, Unit 1 and Unit 2 W. Dehaas - Commonwealth of Pennsylvania - Bureau of Radiation Protection G. Van Noordennen - TMI-2 Solutions, LLC Three Mile Island 2020 Annual Radioactive Effluent Release Report : Summary of Radioactive Liquid and Gaseous Effluents Released from TMI during 2020 : Solid Waste Shipped Offsite During 2020 : Summary of Unplanned Releases from the TMI Site During 2020 : Changes to the Process Control Program and the Offsite Dose Calculation Manual During 2020 and a Listing of New Locations for Dose Calculations and/or Environmental Monitoring Identified by the Land use Census : Instrumentation Not Returned to Operable Status within 30 days During 2020 : Annual Summary of Hourly Meteorological Data During 2020 : Assessment of Radiation Doses due to Radioactive Liquid and Gaseous Effluents Released from TMI During 2020 : Assessment of Radiation Doses Liquid and Gaseous Effluents Releases to Members of the Public within the TMI Site Boundaries During 2020 : Assessment of Radiation Dose to Most Likely Exposed Real Individual per 40 CFR 190 0: Deviations from the ODCM Sampling and Analysis Regime During 2020 1: Major Changes to Radioactive Waste Treatment Systems

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 17 Summary of Radioactive Liquid and Gaseous Effluents Released from TMI during 2020

2020 Annual Radioactive Effluent Release Report for TMI - Page 2 of 17 TABLE 1A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES TMI-1 UNIT QUARTER 1 QUARTER 2 QUARTER 3 QUARTER 4 EST TOTAL ERROR %

A. FISSION AND ACTIVATION GASES

1. Total Release Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25%

2. Avg release rate for period

µCi/S 0.00E+00 0.00E+00 0.00E+00 0.00E+00

3. Percent of applicable limit B. IODINES

1. Total Iodine 1131 Ci

<LLD

<LLD 25%

2. Avg Release Rate for Period

µCi/S N/A N/A N/A N/A

3. Percent of applicable limit C. PARTICULATES

1. Part With half-life >8 days Ci

<LLD

<LLD 25%

2. Avg Release Rate for Period

µCi/S N/A N/A N/A N/A

3. Percent of applicable limit D. TRITIUM

1. Total Release Ci 4.16E+01 3.82E+01 2.98E+01 1.27E+01 15%

2. Avg Release Rate for Period

µCi/S 5.29E+00 4.85E+00 3.75E+00 1.60E+00

3. Percent of applicable limit E. GROSS ALPHA

1. Total Release Ci

<LLD

<LLD 25%

2. Avg release rate for period

µCi/S N/A N/A N/A N/A

3. Percent of applicable limit

µCi/S F. CARBON 14

1. Total Release Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00

2. Avg release rate for period

µCi/S 0.00E+00 0.00E+00 0.00E+00 0.00E+00

3. Percent of applicable limit

µCi/S Note:

Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD)

ODCM Limits - Listed on Dose Summary Table

- C-14 production was estimated using EPRI Technical Report 1021106 Methodology.

2020 Annual Radioactive Effluent Release Report for TMI Page 3 of 17 TABLE 1B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT GASEOUS EFFLUENTS - GROUND-LEVEL RELEASES - BATCH MODE TMI-1 Fission And Activation Gasses Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Ar-41 Ci

<LLD

<LLD Kr-85 Ci

<LLD

<LLD Kr-85m Ci

<LLD

<LLD Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-131m Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-133m Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Xe-135m Ci

<LLD

<LLD Xe-138 Ci

<LLD

<LLD Total Ci N/A N/A

<LLD N/A Radioiodines Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 I-131 Ci

<LLD

<LLD I-132 Ci

<LLD

<LLD I-133 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Particulates Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Cr-51 Ci

<LLD

<LLD Mn-54 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Fe-59 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD Sr-89 Ci

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Mo-99 Ci

<LLD

<LLD Ag-110m Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD

<LLD Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Ce-141 Ci

<LLD

<LLD Ce-144 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Tritium Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H3 Ci

<LLD

<LLD Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI Page 4 of 17 TABLE 1B (continued)

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 GASEOUS EFFLUENTS - GROUND-LEVEL RELEASES - CONTINUOUS MODE TMI-1 Fission And Activation Gasses Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Ar-41 Ci

<LLD

<LLD Kr-85 Ci

<LLD

<LLD Kr-85m Ci

<LLD

<LLD Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-133m Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Xe-138 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Radioiodines Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 I-131 Ci

<LLD

<LLD I-132 Ci

<LLD

<LLD I-133 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Particulates Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Cr-51 Ci

<LLD

<LLD Mn-54 Ci

<LLD

<LLD Fe-55 Ci

<LLD

<LLD Co-57 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Fe-59 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD Ni-63 Ci

<LLD

<LLD Sr-89 Ci

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Nb-95 Ci

<LLD

<LLD Zr-95 Ci

<LLD

<LLD Mo-99 Ci

<LLD

<LLD Ag-110m Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD

<LLD Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Ce-141 Ci

<LLD

<LLD Ce-144 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Tritium Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H3 Ci

<LLD

<LLD 1.27E-03 Carbon 14 Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 C-14 Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI Page 5 of 17 TABLE 1D EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 GASEOUS EFFLUENTS - MIXED MODE RELEASES - BATCH MODE Fission And Activation Gasses Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Ar-41 Ci

<LLD

<LLD Kr-85 Ci

<LLD

<LLD Kr-85m Ci

<LLD

<LLD Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-131m Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-133m Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Xe-135m Ci

<LLD

<LLD Xe-138 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Radioiodines Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 I-131 Ci

<LLD

<LLD I-132 Ci

<LLD

<LLD I-133 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Particulates Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Cr-51 Ci

<LLD

<LLD Mn-54 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Fe-59 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD Sr-89 Ci

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Mo-99 Ci

<LLD

<LLD Ag-110m Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD

<LLD Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Ce-141 Ci

<LLD

<LLD Ce-144 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Tritium Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H3 Ci

<LLD

<LLD Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI Page 6 of 17 TABLE 1D (continued)

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 GASEOUS EFFLUENTS - MIXED MODE RELEASES - CONTINUOUS MODE TMI-1 Fission And Activation Gasses Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Ar-41 Ci

<LLD

<LLD Kr-85 Ci

<LLD

<LLD Kr-85m Ci

<LLD

<LLD Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-133m Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Xe-138 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Radioiodines Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 I-131 Ci

<LLD

<LLD I-132 Ci

<LLD

<LLD I-133 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Particulates Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Cr-51 Ci

<LLD

<LLD Mn-54 Ci

<LLD

<LLD Fe-55 Ci

<LLD

<LLD Co-57 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Fe-59 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD Ni-63 Ci

<LLD

<LLD Sr-89 Ci

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Nb-95 Ci

<LLD

<LLD Zr-95 Ci

<LLD

<LLD Mo-99 Ci

<LLD

<LLD Ag-110m Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD

<LLD Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Ce-141 Ci

<LLD

<LLD Ce-144 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Tritium Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H3 Ci 4.16E+01 3.19E+01 2.98E+01 1.27E+01 Carbon 14 Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 C-14 Ci N/A N/A N/A N/A Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI Page 7 of 17 TABLE 2A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES TMI-1 EST TOTAL UNIT QUARTER 1 QUARTER 2 QUARTER 3 QUARTER 4 ERROR %

A. Fission and Activation Products

1.

Total Release(Not incl.

Tritium,gases,alpha)

Ci 3.52E-05 3.15E-04 2.28E-04 4.48E-04 25%

2. Avg diluted concentration during period

µCi/ml 9.90E-12 4.98E-11 4.93E-11 1.07E-10

3. Percent of applicable limit B. Tritium

1. Total Release Ci 3.23E+01 1.40E+02 5.21E+01 4.93E+01 25%

2. Avg diluted concentration during period

µCi/ml 9.09E-06 2.22E-05 1.13E-05 1.18E-05

3. Percent of applicable limit C. Dissolved and Entrained Gases

1. Total Release Ci

<LLD

<LLD 15%

2. Avg diluted concentration during period

µCi/ml 0.00E-00 0.00E-00 0.00E-00 0.00E+00 0.00E+00

3. Period of applicable limit D. Gross Alpha Activity

1. Total Release Ci

<LLD

<LLD 25%

E. VOLUME OF WASTE RELEASE (PRIOR TO DILUTION)

LITERS 8.45E+07 8.50E+07 8.52E+07 8.80E+07 10%

F. VOLUME OF DILUTION WATER USED LITERS 3.47E+09 6.24E+09 4.54E+09 4.11E+09 10%

2020 Annual Radioactive Effluent Release Report for TMI Page 8 of 17 TABLE 2B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 LIQUID EFFLUENTS - BATCH MODE TMI-1 Fission and Activation Products Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H-3 Ci 3.23E+01 1.40E+02 5.21E+01 3.80E+01 Cr-51 Ci

<LLD

<LLD Mn-54 Ci

<LLD

<LLD Fe-55 Ci

<LLD

<LLD Co-58 Ci 3.21E-06 9.54E-05 1.12E-05 4.53E-06 Fe-59 Ci

<LLD

<LLD Co-60 Ci 9.72E-06 2.05E-04 1.94E-04 1.86E-04 Zn-65 Ci

<LLD

<LLD Sr-89 Ci Ci

<LLD

<LLD Sr-90 Zr-95 Ci

<LLD

<LLD Nb-95 Ci

<LLD

<LLD Mo-99 Ci Ci

<LLD

<LLD Tc-99m Ag-110m Ci

<LLD

<LLD I-131 Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci 2.23E-05 7.17E-06 2.31E-05 1.81E-05 Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Ce-141 Ci

<LLD

<LLD Ce-144 Ci

<LLD

<LLD Total Ci 3.23E+01 1.40E+02 5.21E+01 3.80E+01 Dissolved and Entrained Gases Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-133m Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Note:

Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI Page 9 of 17 TABLE 2B (continued)

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 LIQUID EFFLUENTS - CONTINUOUS MODE TMI-1 Fission and Activation Products Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H-3 Ci 3.10E-03 6.84E-03 3.44E-03 1.13E+01 Cr-51 Ci

<LLD

<LLD Mn-54 Ci

<LLD

<LLD Fe-55 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Fe-59 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD Zn-65 Ci

<LLD

<LLD Sr-89 Ci

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Zr-95 Ci

<LLD

<LLD Nb-95 Ci

<LLD

<LLD Mo-99 Ci

<LLD

<LLD Tc-99m Ci

<LLD

<LLD Ag-110m Ci

<LLD

<LLD I-131 Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD 7.49E-06

<LLD 2.39E-04 Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Ce-141 Ci

<LLD

<LLD Ce-144 Ci

<LLD

<LLD Total Ci 3.10E-03 6.85E-03 3.44E-03 1.13E+01 Dissolved and Entrained Gases Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-133m Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI Page 10 of 17 EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 SUPPLEMENTAL INFORMATION FACILITY: TMI UNIT 1 LICENSE: DPR 50-289

1.

Regulatory Limits -- Please refer to TMI Offsite Dose Calculation Manual A.

Fission and Activation Gases:

B.

Iodines:

C.

Particulates, Half-Lives > 8 Days:

D.

Liquid Effluents:

2.

Maximum Effluent Concentrations -- 10 Times CFR 20, Appendix B Table II Provide the maximum effluent concentrations used in determining allowable release rates or concentrations A.

Fission and Activation Gases:

B.

Iodines:

C.

Particulates, Half-Lives > 8 Days:

D.

Liquid Effluents:

3.

Average Energy Provide the average energy (E-BAR) of the radionuclide mixture in releases of fission and activation gases, if applicable N/A

4.

Measurements and Approximations of Total Radioactivity Provide the methods to measure or approximate the total radioactivity in effluents and the methods used to determine radionuclide composition:

A.

B.

Fission and Activ. Gases:

Iodines:

HPGE Spectrometry, Liquid Scintillation HPGE Spectrometry C.

D.

Particulates:

Liquid Effluents:

HPGE Spectrometry, Gas Flow Proportional, Beta Spectrometry HPGE Spectrometry, Liquid Scintillation E.

F.

Gross Alpha Carbon 14 Gas Flow Proportional Estimated using the methodology included in the EPRI Technical Report 1021106.

5.

Batch Releases Provide the following information relating to batch releases of radioactive materials in liquid and gaseous effluents.

Quarter 1 Quarter 2 Quarter 3 Quarter 4 A. LIQUID (ALL TIMES IN MINUTES)

1.

Number of batch releases 7

37 19 28

2.

Total time period for batch releases (min) 3192 17340 13370 82,250

3.

Maximum time period for a batch release (min) 1005 815 1095 720

4.

Average time period for a batch release (min) 456 469 704 294

5.

Minimum time period for a batch release (min) 227 227 15 190

6.

Average stream flow during periods of release of effluent into a flowing stream (cfm) 6.37E+06 2.30E+06 4.09E+05 8.38E+05 B. GASEOUS

1.

Number of batch releases N/A N/A N/A N/A

2.

Total time period for batch releases (min)

N/A N/A N/A N/A

3.

Maximum time period for a batch release (min)

N/A N/A N/A N/A

4.

Average time period for a batch release (min)

N/A N/A N/A N/A

5.

Minimum time period for a batch release (min)

N/A N/A N/A N/A

6.

Abnormal Releases Quarter 1 Quarter 2 Quarter 3 Quarter 4 A. LIQUID

1.

Number of releases 3

3 3

3

2.

Total activity released (curies) 2.75E-03 2.75E-03 2.78E-03 2.78E-03 B. GASEOUS

1.

Number of releases 0

0 0

1

2.

Total activity released (curies) 0 0

0 1.27E-03

2020 Annual Radioactive Effluent Release Report for TMI - Page 11 of 17 TABLE 1A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES TMI-2 UNIT QUARTER 1 QUARTER 2 QUARTER 3 QUARTER 4 EST TOTAL ERROR %

A. FISSION AND ACTIVATION GASES

1. Total Release Ci

<LLD

<LLD 25%

2. Avg release rate for period

µCi/S N/A N/A N/A N/A

3. Percent of applicable limit B. IODINES

1. Total Iodine I131 Ci N/A N/A N/A N/A 25%

2. Avg release rate for period

µCi/S N/A N/A N/A N/A

3. Percent of applicable limit C. PARTICULATES

1. Part. With half-life >8 days Ci

<LLD

<LLD 25%

2. Avg release rate for period

µCi/S N/A N/A N/A N/A

3. Percent of applicable limit

4. Gross alpha radioactivity Ci

<LLD

<LLD D. TRITIUM

1. Total Release Ci 2.31E-02 6.29E-02 4.99E-02 1.01E-01 25%

2. Avg release rate for period

µCi/S 2.94E-03 8.01E-03 6.28E-03 1.27E-02

3. Percent of applicable limit Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

ODCM Limits - Listed on Dose summary Table

2020 Annual Radioactive Effluent Release Report for TMI - Page 12 of 17 TABLE 1D EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 GASEOUS EFFLUENTS - MIXED MODE RELEASES - BATCH MODE TMI-2 Fission And Activation Gasses Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Ar-41 Ci N/A N/A N/A N/A Kr-85 Ci N/A N/A N/A N/A Kr-85m Ci N/A N/A N/A N/A Kr-87 Ci N/A N/A N/A N/A Kr-88 Ci N/A N/A N/A N/A Xe-133 Ci N/A N/A N/A N/A Xe-135 Ci N/A N/A N/A N/A Xe-135m Ci N/A N/A N/A N/A Xe-138 Ci N/A N/A N/A N/A Total Ci N/A N/A N/A N/A Radioiodines Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 I-131 Ci N/A N/A N/A N/A I-133 Ci N/A N/A N/A N/A I-135 Ci N/A N/A N/A N/A Total Ci N/A N/A N/A N/A Particulates Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Cr-51 Ci N/A N/A N/A N/A Mn-54 Ci N/A N/A N/A N/A Co-58 Ci N/A N/A N/A N/A Fe-59 Ci N/A N/A N/A N/A Co-60 Ci N/A N/A N/A N/A Sr-89 Ci N/A N/A N/A N/A Sr-90 Ci N/A N/A N/A N/A Mo-99 Ci N/A N/A N/A N/A Ag-110m Ci N/A N/A N/A N/A Cs-134 Ci N/A N/A N/A N/A Cs-137 Ci N/A N/A N/A N/A Ba-140 Ci N/A N/A N/A N/A La-140 Ci N/A N/A N/A N/A Ce-141 Ci N/A N/A N/A N/A Ce-144 Ci N/A N/A N/A N/A Total Ci N/A N/A N/A N/A Tritium Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H3 Ci N/A 4.50E-04 N/A N/A Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI - Page 13 of 17 TABLE 1D (continued)

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 GASEOUS EFFLUENTS - MIXED MODE RELEASES - CONTINUOUS MODE TMI-2 Fission And Activation Gasses Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Ar-41 Ci

<LLD

<LLD Kr-85 Ci

<LLD

<LLD Kr-85m Ci

<LLD

<LLD Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Xe-135m Ci

<LLD

<LLD Xe-138 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Radioiodines Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 I-131 Ci N/A N/A N/A N/A I-133 Ci N/A N/A N/A N/A I-135 Ci N/A N/A N/A N/A Total Ci N/A N/A N/A N/A Particulates Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Cr-51 Ci

<LLD

<LLD Mn-54 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Fe-59 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD Sr-89 Ci

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Mo-99 Ci

<LLD

<LLD Ag-110m Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci

<LLD

<LLD Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Ce-141 Ci

<LLD

<LLD Ce-144 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Tritium Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H3 Ci 2.31E-02 6.25E-02 4.99E-02 1.01E-01 Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI - Page 14 of 17 TABLE 2A EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES TMI-2 UNIT QUARTER 1 QUARTER 2 QUARTER 3 QUARTER 4 EST TOTAL ERROR %

A. FISSION AND ACTIVATION PRODUCTS

1. Total Release (Not incl. Tritium, gases, alpha)

Ci 1.27E-06 4.72E-06 6.49E-06 3.11E-06 25%

2. Avg diluted concentration during period

µCi/ml 1.28E-09 3.07E-09 1.26E-09 4.36E-09

3. Percent of applicable limit B. TRITIUM

1. Total Release Ci 3.08E-06

<LLD 2.73E-06

<LLD 25%

2. Avg diluted concentration during period

µCi/ml 3.11E-09 N/A 5.28E-10 N/A

3. Percent of applicable limit C. DISSOLVED AND ENTRAINED GASES

1. Total Release Ci

<LLD

<LLD 25%

2. Avg diluted concentration during period

µCi/ml N/A N/A N/A N/A

3. Percent of applicable limit D. GROSS ALPHA RADIOACTIVITY

1. Total Release Ci

<LLD

<LLD 25%

E. VOLUME OF WASTE RELEASE (PRIOR TO DILUTION)

LITERS 1.21E+03 3.47E+03 1.52E+04 2.49E+03 10%

F. VOLUME OF DILUTION WATER USED LITERS 9.89E+05 1.54E+06 5.15E+06 7.12E+05 10%

Note: Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

ODCM Limits - Listed on Dose summary Table

2020 Annual Radioactive Effluent Release Report for TMI - Page 15 of 17 TABLE 2B EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 LIQUID EFFLUENTS - BATCH MODE TMI-2 Fission and Activation Products Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H-3 Ci 3.08E-06

<LLD 2.73E-06

<LLD Cr-51 Ci

<LLD

<LLD Mn-54 Ci

<LLD

<LLD Fe-55 Ci

<LLD

<LLD Co-58 Ci

<LLD

<LLD Fe-59 Ci

<LLD

<LLD Co-60 Ci

<LLD

<LLD Zn-65 Ci

<LLD

<LLD Sr-89 Ci

<LLD

<LLD Sr-90 Ci

<LLD

<LLD Zr-95 Ci

<LLD

<LLD Nb-95 Ci

<LLD

<LLD Mo-99 Ci

<LLD

<LLD Tc-99m Ci

<LLD

<LLD Ag-110m Ci

<LLD

<LLD I-131 Ci

<LLD

<LLD Cs-134 Ci

<LLD

<LLD Cs-137 Ci 1.27E-06 4.72E-06 6.47E-06 3.11E-06 Ba-140 Ci

<LLD

<LLD La-140 Ci

<LLD

<LLD Ce-141 Ci

<LLD

<LLD Ce-144 Ci

<LLD

<LLD Total Ci 4.35E-06 4.72E-06 9.22E-06 3.11E-06 Dissolved and Entrained Gases Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Kr-87 Ci

<LLD

<LLD Kr-88 Ci

<LLD

<LLD Xe-133 Ci

<LLD

<LLD Xe-133m Ci

<LLD

<LLD Xe-135 Ci

<LLD

<LLD Total Ci N/A N/A N/A N/A Note:

Table 3 contains a listing of TMI ODCM Lower Limit of Detection (LLD).

2020 Annual Radioactive Effluent Release Report for TMI - Page 16 of 17 TABLE 2B (continued)

EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT 2020 LIQUID EFFLUENTS - CONTINUOUS MODE TMI-2 Fission and Activation Products Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 H-3 Ci N/A N/A N/A N/A Cr-51 Ci N/A N/A N/A N/A Mn-54 Ci N/A N/A N/A N/A Fe-55 Ci N/A N/A N/A N/A Co-58 Ci N/A N/A N/A N/A Fe-59 Ci N/A N/A N/A N/A Co-60 Ci N/A N/A N/A N/A Zn-65 Ci N/A N/A N/A N/A Sr-89 Ci N/A N/A N/A N/A Sr-90 Ci N/A N/A N/A N/A Zr-95 Ci N/A N/A N/A N/A Nb-95 Ci N/A N/A N/A N/A Mo-99 Ci N/A N/A N/A N/A Tc-99m Ci N/A N/A N/A N/A Ag-110m Ci N/A N/A N/A N/A I-131 Ci N/A N/A N/A N/A Cs-134 Ci N/A N/A N/A N/A Cs-137 Ci N/A N/A N/A N/A Ba-140 Ci N/A N/A N/A N/A La-140 Ci N/A N/A N/A N/A Ce-141 Ci N/A N/A N/A N/A Ce-144 Ci N/A N/A N/A N/A Total Ci N/A N/A N/A N/A Dissolved and Entrained Gases Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Kr-87 Ci N/A N/A N/A N/A Kr-88 Ci N/A N/A N/A N/A Xe-133 Ci N/A N/A N/A N/A Xe-133m Ci N/A N/A N/A N/A Xe-135 Ci N/A N/A N/A N/A Total Ci N/A N/A N/A N/A

2020 Annual Radioactive Effluent Release Report for TMI - Page 17 of 17 TABLE 3 ODCM REQUIRED LOWER LIMIT OF DETECTION (LLD)

Gaseous Sampling Radioisotope:

Tritium LLD Value 1E-06 µCi/ml Principal Gamma Emitters Gas (Kr-87, Kr-88, Xe-133, Xe-133m, Xe-135 1E-04 µCi/ml Principal Gamma Emitters Particulate Mn-54 1E-11 µCi/ml Fe-59 1E-11 µCi/ml Co-58 1E-11 µCi/ml Co-60 1E-11 µCi/ml Zn-65 1E-11 µCi/ml Mo-99 1E-11 µCi/ml Cs-137 1E-11 µCi/ml Ce-141 1E-11 µCi/ml Ce-144 1E-11 µCi/ml Iodine 131 1E-12 µCi/ml Gross Alpha 1E-11 µCi/ml Sr-89 1E-11 µCi/ml Sr-90 1E-11 µCi/ml Liquid Sampling Radioisotope:

Tritium LLD Value 1E-05 µCi/ml Principal Gamma Emitters Mn-54 5E-07 µCi/ml Fe-59 5E-07 µCi/ml Co-58 5E-07 µCi/ml Co-60 5E-07 µCi/ml Zn-65 5E-07 µCi/ml Mo-99 5E-07 µCi/ml Cs-134 5E-07 µCi/ml Cs-137 5E-07 µCi/ml Ce-141 5E-07 µCi/ml Ce-144 5E-07 µCi/ml Iodine 131 1E-06 µCi/ml Dissolved and Entrained Gases (Kr-87, Kr-88, Xe-133, Xe-133m, Xe-135) 1E-05 µCi/ml Fe-55 1E-06 µCi/ml Gross Alpha Sr-89 Sr-90 1E-07 µCi/ml 5E-08 µCi/ml 5E-08 µCi/ml

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 4 Solid Waste Shipped Offsite During 2020

2020 Annual Radioactive Effluent Release Report for TMI - Page 2 of 4 2020 Annual Radioactive Effluent Release Report Solid Waste and Irradiated Fuel Shipments TMI-1 A.

Solid Waste Shipped Offsite for Burial or Disposal (Not irradiated fuel)

1. Types of Waste Types of Waste Total Quantity (m3 )

Total Activity (Ci)

Period Est.

Total Error %

a. Spent resins, filters, evaporator bottoms, etc.

0 0

01/01/20-12/31/20

+/- 25%

b. Dry compressible waste, contaminated equip, etc.

1.35E+02 7.20E-03 01/01/20-12/31/20

+/- 25%

c. Irradiated components, control rods, etc.

0 0

01/01/20-12/31/20

+/- 25%

d. Other (Oil, Sludge, Sealed Sources) 0 0

01/01/20-12/31/20

+/- 25%

2. Estimate of major nuclide composition (by waste type)

Major Nuclide Composition

a. None

b.

Co-60 38.52 Ni-63 39.40 c

None

d. None

2020 Annual Radioactive Effluent Release Report for TMI - Page 3 of 4 2020 Annual Radioactive Effluent Release Report Solid Waste and Irradiated Fuel Shipments TMI-1

3. Solid Waste Disposition Number of Shipments 1

Mode of Transportation Hittman Transport Services Destination Energy Solutions LLC 1560 Bear Creek Rd Oak Ridge, TN 4

Hittman Transport Services Energy Solutions LLC 628 Gallaher Road Kingston, TN B.

Irradiated Fuel Shipments (disposition)

Number of Shipments Mode of Transportation Destination None None None C.

Changes to the Process Control Program None

2020 Annual Radioactive Effluent Release Report for TMI - Page 4 of 4 2020 Annual Radioactive Effluent Release Report Solid Waste and Irradiated Fuel Shipments TMI-2 A.

Solid Waste Shipped Offsite for Burial or Disposal (Not irradiated fuel)

1. Types of Waste Types of Waste Total Quantity (m3 )

Total Activity (Ci)

Period Est. Total Error %

a.

Spent resins, filter sludges, evaporator bottoms, etc.

0.00E+00 0.00E+00 01/01/20-12/31/20

+/- 25%

b.

Dry compressible waste, contaminated equip, etc.

0.00E+00 0.00E+00 01/01/20-12/31/20

+/- 25%

c.

Irradiated components, control rods, etc.

0.00E+00 0.00E+00 01/01/20-12/31/20

+/- 25%

d.

Other (describe) radwaste system sump excess water from rain intrusion 0.00E+00 0.00E+00 01/01/20-12/31/20

+/- 25%

2. Estimate of major nuclide composition (by waste type)

Major Nuclide Composition

a.

None

b.

None

c.

None

d.

None

3. Solid Waste Disposition Number of Shipments Mode of Transportation Destination None None None B.

Irradiated Fuel Shipments (disposition)

Number of Shipments Mode of Transportation Destination None None None

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 1 Summary of Unplanned Releases from the TMI Site During 2020 There were no unplanned releases from TMI-2 in 2020. The unplanned releases for TMI-1 are summarized in the supplemental information in Attachment 1. The information is reported separately for liquid and gaseous releases, and the number of releases is reported for each quarter with a total curies released. The activity for these releases is also included in Tables 2A and 2B.

The abnormal liquid releases are monthly releases to account for the tritium in groundwater released into the river.

There was one unplanned gaseous release for TMI-1. During drain down of the Borated Water Storage Tank (BWST), the flange was removed to facilitate draining and venting. The release was captured in permit G-20201013-531-C. It was considered an unplanned release due to this point not normally being a release pathway.

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 1 CHANGES TO THE PROCESS CONTROL PROGRAM AND THE OFFSITE DOSE CALCULATION MANUAL DURING 2020 AND A LISTING OF NEW LOCATIONS FOR DOSE CALCULATIONS AND/OR ENVIRONMENTAL MONITORING IDENTIFIED BY THE LAND USE CENSUS

1.

Changes to the Process Control Program There were no changes to the TMI Process Control Program in 2020.

2.

Changes to the Offsite Dose Calculation Manual There were no changes to the Offsite Dose Calculation Manual.

3.

A listing of new locations for dose calculations and/or environmental monitoring identified by the Land Use Census.

Based on the results of the 2020 Land Use Census, no changes were required to the Radiological Environmental Monitoring Program. There were residences in all sixteen (16) meteorological sectors as identified in this report.

There were gardens identified in all sixteen sectors. The nearest gardens in sectors ESE and SE were updated due to a large cornfield that spans both sectors have been planted since trees were cleared to support the sub-station during the 2019-2020 time frame.

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 1 Instrumentation Not Returned to Operable Status Within 30 Days During 2020 There were no instruments not returned to operable status within 30 days during 2020.

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 17 Annual Summary of Hourly Meteorological Data for 2020 The percent data recovery for meteorological information for 2020 was 99.8 percent. The data is presented by quarter.

2020 Annual Radioactive Effluent Release Report for TMI - Page 2 of 17 Three Mile Island Alpha Period of Record: January - March 2020 Stability Class - Extremely Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

1 2

1 0

7 NNE 0

0 0

1 0

0 1

NE 0

0 0

ENE 0

1 0

0 0

0 1

E 0

1 0

0 0

0 1

ESE 0

2 1

0 0

0 3

SE 0

3 8

0 0

0 11 SSE 0

3 0

0 0

0 3

S 2

4 2

0 0

0 8

SSW 0

4 4

0 0

0 8

SW 0

5 3

0 0

0 8

WSW 0

0 0

W 3

0 0

0 3

WNW 1

1 0

0 0

0 2

NW 3

1 2

0 0

0 6

NNW 4

7 3

2 2

0 18 Variable 0

0 0

Total 14 34 24 5

3 0

80 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 Three Mile Island Alpha Period of Record: January - March 2020 Stability Class - Moderately Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

0 1

1 0

0 0

2 NNE 0

0 0

NE 0

0 0

ENE 0

1 0

0 0

0 1

E 0

0 0

ESE 0

1 0

0 2

SE 0

1 1

1 0

0 3

SSE 0

1 0

0 0

0 1

S 1

3 1

0 0

0 5

SSW 0

2 0

1 0

0 3

SW 1

0 2

0 0

0 3

WSW 1

0 0

0 1

W 0

1 3

1 0

0 5

WNW 0

0 0

NW 1

1 2

4 0

0 8

NNW 1

4 0

5 2

0 12 Variable 0

0 0

Total 5

16 10 13 2

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:

0

2020 Annual Radioactive Effluent Release Report for TMI - Page 3 of 17 Three Mile Island Alpha Period of Record: January - March 2020 Stability Class - Slightly Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

0 1

2 3

0 0

6 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 0

2 1

1 0

0 4

SSE 0

0 1

0 0

0 1

S 0

3 0

0 0

0 3

SSW 0

1 2

0 0

0 3

SW 1

0 3

0 0

0 4

WSW 0

1 1

0 0

0 2

W 0

0 4

1 0

0 5

WNW 1

0 1

1 0

0 3

NW 4

0 2

1 0

0 7

NNW 2

2 2

1 4

1 12 Variable 0

0 0

Total 8

10 19 8

4 1

50 Hours of calm in this stability class:

0 Hours of missing win d measuremen ts in this stability cla 0

Hours of missing sta bility measurem ents in all stability classes:

0 Three Mile Island Alpha Period of Record: January - March 2020 Stability Class - Neutral - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

4 21 23 11 1

0 60 NNE 8

14 0

0 0

0 22 NE 8

14 4

0 0

0 26 ENE 11 20 2

0 0

0 33 E

11 37 5

0 0

0 53 ESE 11 62 17 3

1 0

94 SE 15 39 25 6

0 0

85 SSE 7

28 10 0

0 0

45 S

10 18 8

1 0

0 37 SSW 4

14 8

4 0

0 30 SW 1

4 8

2 0

0 15 WSW 1

12 6

0 0

0 19 W

7 20 22 41 12 0

102 WNW 2

16 35 44 6

1 104 NW 4

16 49 61 24 8

162 NNW 7

18 49 27 12 2

115 Variable 0

0 0

Total 111 353 271 200 56 11 1002 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

2020 Annual Radioactive Effluent Release Report for TMI - Page 4 of 17 Three Mile Island Alpha Period of Record: January - March 2020 Stability Class - Slightly Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

26 29 7

1 0

0 63 NNE 20 20 1

0 0

0 41 NE 12 3

0 0

15 ENE 13 3

0 0

16 E

25 14 2

0 0

0 41 ESE 21 20 3

3 0

0 47 SE 18 26 5

1 0

0 50 SSE 24 13 1

0 0

0 38 S

14 10 16 4

0 0

44 SSW 14 14 4

5 0

0 37 SW 14 14 11 5

1 0

45 WSW 4

21 5

3 0

0 33 W

10 19 7

4 0

0 40 WNW 6

18 17 10 1

0 52 NW 15 25 23 22 2

0 87 NNW 21 21 11 11 2

0 66 Variable 0

0 0

Total 257 270 113 69 6

0 715 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 Three Mile Island Alpha Period of Record: January - March 2020 Stability Class - Moderately Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

7 4

0 0

11 NNE 8

1 0

0 0

0 9

NE 7

0 0

0 7

ENE 3

0 0

0 3

E 10 0

0 0

10 ESE 13 5

0 0

18 SE 12 4

0 0

16 SSE 9

2 0

0 0

0 11 S

9 4

0 0

13 SSW 11 6

0 0

17 SW 3

6 0

0 0

0 9

WSW 10 6

1 0

0 0

16 W

9 2

0 0

11 WNW 4

2 1

0 0

0 6

NW 5

1 1

0 1

0 8

NNW 4

4 1

1 0

0 10 Variable 0

0 0

Total 124 47 2

1 1

0 175 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

2020 Annual Radioactive Effluent Release Report for TMI - Page 5 of 17 Three Mile Island Alpha Period of Record: January - March 2020 Stability Class - Extremely Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

5 3

0 0

8 NNE 0

0 0

NE 4

0 0

0 4

ENE 1

0 0

0 1

E 4

3 0

0 0

0 7

ESE 16 1

0 0

17 SE 6

3 0

0 0

0 9

SSE 11 1

0 0

12 S

9 0

0 0

9 SSW 11 3

0 0

14 SW 10 0

0 0

10 WSW 3

2 0

0 0

0 5

W 4

2 0

0 0

0 6

WNW 0

0 0

NW 0

0 0

NNW 2

1 0

0 0

0 3

Variable 0

0 0

Total 86 19 0

0 0

0 105 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

2020 Annual Radioactive Effluent Release Report for TMI - Page 6 of 17 Three Mile Alpha 2020 Period of Record: April - June 2020 Stability Class - Extremely Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

0 3

0 0

3 NNE 0

1 0

0 0

0 1

NE 0

0 0

ENE 1

2 3

0 0

0 6

E 0

3 1

1 1

0 6

ESE 0

4 3

5 0

0 12 SE 0

4 4

2 0

0 10 SSE 0

1 2

0 0

0 3

S 0

1 5

0 0

0 6

SSW 0

4 8

3 0

0 15 SW 0

3 11 0

0 0

14 WSW 1

0 0

0 1

W 1

3 2

0 0

0 6

WNW 5

3 2

0 0

0 10 NW 2

5 10 1

0 0

18 NNW 1

13 7

0 1

1 23 Variable 0

0 0

Total 11 50 58 12 2

1 134 Hours of calm in this stability class:

0 Hours of missing wind measurements in this stability class:

0 Hours of missing stab ility measurements in all stability classes:

3 Three Mile Island Alpha Period of Record: April - June 2020 Stability Class - Moderately Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

0 3

2 0

0 0

5 NNE 0

0 0

NE 0

1 0

0 0

0 1

ENE 0

2 0

0 0

0 2

E 0

3 3

1 0

0 7

ESE 1

3 3

6 0

0 13 SE 0

5 4

1 1

0 11 SSE 0

3 2

0 0

0 5

S 0

1 0

0 0

0 1

SSW 1

3 2

2 0

0 8

SW 1

3 1

0 0

0 5

WSW 1

1 1

0 0

0 3

W 1

1 0

0 3

WNW 1

2 3

0 0

0 6

NW 0

1 5

3 1

0 10 NNW 0

2 5

3 0

0 10 Variable 0

0 0

Total 6

34 31 17 2

0 90 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

2020 Annual Radioactive Effluent Release Report for TMI - Page 7 of 17 Three Mile Island Alpha Period of record: April - June 2020 Stability Class - Slightly Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

2 0

0 0

0 2

ENE 0

3 0

0 0

0 3

E 0

2 1

0 0

0 3

ESE 0

3 2

1 0

0 6

SE 0

2 4

1 0

0 7

SSE 1

5 2

0 0

0 8

S 0

3 0

0 0

0 3

SSW 3

3 4

1 0

0 11 SW 2

1 1

0 0

0 4

WSW 0

0 1

0 0

0 1

W 1

0 2

1 0

0 4

WNW 1

5 4

7 2

2 21 NW 3

2 8

8 1

1 23 NNW 1

6 6

4 0

0 17 Variable 0

0 0

Total 12 37 35 23 3

3 113 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 Three Mile Island Alpha Period of Record: April - June 2020 Stability Class - Neutral - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

4 15 16 4

2 0

41 NNE 2

16 1

1 0

0 20 NE 8

13 2

0 0

0 23 ENE 4

25 0

0 0

0 29 E

6 49 9

3 0

0 67 ESE 6

42 29 11 2

0 90 SE 11 40 25 1

0 0

77 SSE 8

39 24 2

0 0

73 S

7 25 15 1

0 0

48 SSW 6

28 19 3

0 0

56 SW 8

19 8

0 0

0 35 WSW 3

12 9

3 1

0 28 W

5 16 23 13 2

0 59 WNW 7

16 53 49 11 3

139 NW 3

15 61 55 26 8

168 NNW 7

17 44 34 9

1 112 Variable 0

0 0

Total 95 387 338 180 53 12 1065 Hours of calm in this stability class:

0 Hours of missing win d measuremen ts in this stability cla 0

Hours of missing sta bility measurem ents in all stability classes:

3

2020 Annual Radioactive Effluent Release Report for TMI - Page 8 of 17 Three Mile Island Alpha Period of Record: April - June 2020 Stability Class - Slightly Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

9 27 6

1 0

0 43 NNE 6

13 1

0 0

0 20 NE 4

11 0

0 0

0 15 ENE 6

8 0

0 0

0 14 E

12 14 0

0 0

0 26 ESE 16 19 0

0 0

0 35 SE 25 10 2

5 0

0 42 SSE 14 13 1

0 0

0 28 S

16 15 4

0 0

0 35 SSW 14 16 5

2 0

0 37 SW 9

12 5

1 0

0 27 WSW 11 19 7

0 0

0 37 W

6 24 8

4 0

0 42 WNW 10 18 5

0 2

0 35 NW 3

12 21 10 1

0 47 NNW 1

14 8

1 3

0 27 Variable 0

0 0

Total 162 245 73 24 6

0 510 Three Mile Island Alpha Period of Record: April - June 2020 Stability Class - Moderately Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

4 3

0 0

7 NNE 4

0 0

0 4

NE 5

0 0

0 5

ENE 8

6 0

0 0

0 14 E

5 4

0 0

9 ESE 10 6

0 0

16 SE 19 4

0 0

23 SSE 13 2

0 0

15 S

18 2

0 0

20 SSW 13 0

0 0

13 SW 8

2 0

0 0

0 10 WSW 4

0 0

0 4

W 10 3

0 0

13 WNW 6

0 0

0 6

NW 6

5 1

0 0

0 12 NNW 10 6

0 0

16 Variable 0

0 0

Total 143 43 1

0 0

0 187 Hours of calm in this stability class:

1 Hours of missing win d measuremen ts in this stability cla 0

Hours of missing sta bility measurem ents in all stability classes:

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:

3

2020 Annual Radioactive Effluent Release Report for TMI - Page 9 of 17 Three Mile Island Alpha Period of Record: April - June 2020 Stability Class - Extremely Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

4 0

0 0

4 NNE 0

1 0

0 0

0 1

NE 2

0 0

0 2

ENE 0

0 0

E 2

1 0

0 0

0 3

ESE 4

3 0

0 0

0 7

SE 4

3 0

0 0

0 7

SSE 9

0 0

0 9

S 16 0

0 0

16 SSW 12 0

0 0

12 SW 9

0 0

0 9

WSW 1

1 0

0 0

0 2

W 1

0 0

0 1

WNW 2

0 0

0 2

NW 1

2 0

0 0

0 3

NNW 2

1 0

0 0

0 3

Variable 0

0 0

Total 69 12 0

0 0

0 81 Hours of calm in this stability class:

0 Hours of missing win d measuremen ts in this stability cla 0

Hours of missing sta bility measurem ents in all stability classes:

3

2020 Annual Radioactive Effluent Release Report for TMI - Page 10 of 17 Three Mile Island Alpha Period of Record: July - September 2020 Stability Class - Extremely Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

1 4

0 0

5 NNE 0

5 1

0 0

0 6

NE 0

2 1

0 0

0 3

ENE 0

6 0

0 0

0 6

E 0

3 1

0 0

0 4

ESE 0

0 0

SE 0

5 3

0 0

0 8

SSE 0

3 0

0 0

0 3

S 0

2 2

0 0

0 4

SSW 0

9 7

2 0

0 18 SW 2

5 4

0 0

0 11 WSW 5

0 0

2 0

0 7

W 1

0 2

0 0

0 3

WNW 10 5

0 0

15 NW 6

5 3

0 0

0 14 NNW 3

16 1

0 0

0 20 Variable 0

0 0

Total 28 70 25 4

0 0

127 Hours of calm in this stability class:

0 Hours of missing win d measuremen ts in this stability cla 0

Hours of missing sta bility measurem ents in all stability classes:

0 Three Mile Island Alpha Period of Record: July - September 2020 Stability Class - Moderately Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

1 3

2 0

0 0

6 NNE 0

2 0

0 0

0 2

NE 1

0 0

0 1

ENE 0

5 0

0 0

0 5

E 0

2 0

0 0

0 2

ESE 0

1 1

0 0

0 2

SE 0

6 0

0 0

0 6

SSE 0

3 0

0 0

0 3

S 0

7 1

0 0

0 8

SSW 1

6 5

0 0

0 12 SW 1

12 2

1 0

0 16 WSW 1

2 0

1 0

0 4

W 1

1 0

0 0

0 2

WNW 1

2 1

0 0

0 4

NW 7

4 1

2 0

0 14 NNW 4

7 3

1 0

0 15 Variable 0

0 0

Total 18 63 16 5

0 0

102 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

2020 Annual Radioactive Effluent Release Report for TMI - Page 11 of 17 Three Mile Island Alpha Period of Record: July - September 2020 Stability Class - Slightly Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

1 2

2 1

0 0

6 NNE 0

3 0

0 0

0 3

NE 0

3 0

0 0

0 3

ENE 0

3 2

0 0

0 5

E 0

1 2

0 0

0 3

ESE 0

5 2

0 0

0 7

SE 0

6 5

0 0

0 11 SSE 1

3 1

0 0

0 5

S 2

7 0

0 0

0 9

SSW 0

8 4

0 0

0 12 SW 1

9 0

0 0

0 10 WSW 1

3 1

1 0

0 6

W 4

0 5

1 0

0 10 WNW 4

5 1

0 0

0 10 NW 5

5 5

1 0

0 16 NNW 3

4 1

4 0

0 22 Variable 0

0 0

Total 22 67 31 8

0 0

128 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 Three Mile Island Alpha Period of Record: July - September 2020 Stability Class - Neutral - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

10 14 13 5

0 0

42 NNE 8

15 2

0 0

0 25 NE 13 20 0

0 0

0 33 ENE 13 25 4

0 0

0 42 E

14 19 2

1 0

0 36 ESE 13 27 6

0 0

0 46 SE 14 65 30 1

0 0

110 SSE 11 34 6

0 0

0 51 S

13 37 3

0 0

0 53 SSW 18 43 13 1

0 0

75 SW 25 28 9

1 0

0 63 WSW 16 19 12 1

0 0

48 W

11 16 21 8

1 0

57 WNW 7

6 16 1

0 0

30 NW 15 6

38 7

0 0

66 NNW 16 14 13 9

0 0

52 Variable 0

0 0

Total 217 388 188 35 1

0 829 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

2020 Annual Radioactive Effluent Release Report for TMI - Page 12 of 17 Three Mile Island Alpha Period of Record: July - September 2020 Stability Class - Slightly Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

15 36 7

0 0

0 58 NNE 10 13 1

0 0

0 24 NE 10 6

0 0

16 ENE 18 7

0 0

25 E

31 16 0

0 0

0 47 ESE 31 15 0

0 0

0 46 SE 35 17 0

0 0

0 52 SSE 30 18 0

0 0

0 48 S

31 17 0

0 0

0 48 SSW 15 21 2

0 0

0 38 SW 22 30 5

0 0

0 57 WSW 20 23 2

0 0

0 45 W

10 47 6

0 0

0 63 WNW 11 20 6

0 0

0 37 NW 13 9

11 2

0 0

35 NNW 3

19 7

1 0

0 30 Variable 0

0 0

Total 305 314 47 3

0 0

669 Hours of calm in this stability class:

5 Hours of missing wind measurement s in this stability c lass:

0 Hours of missing stability measurem ents in all stability classes:

0 Three Mile Island Alpha Period of Record: July - September 2020 Stability Class - Moderately Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

4 10 0

0 0

0 14 NNE 2

0 0

0 2

NE 1

2 0

0 0

0 3

ENE 6

2 0

0 0

0 8

E 9

9 0

0 0

0 18 ESE 26 6

0 0

32 SE 21 4

0 0

25 SSE 42 1

0 0

43 S

33 1

0 0

34 SSW 26 0

0 0

26 SW 12 1

0 0

13 WSW 18 5

0 0

23 W

3 4

0 0

7 WNW 10 3

1 0

0 0

14 NW 5

3 0

0 0

0 8

NNW 13 3

0 0

16 Variable 0

0 0

Total 231 54 1

0 0

0 286 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:

0

2020 Annual Radioactive Effluent Release Report for TMI - Page 13 of 17 Three Mile Island Alpha Period of Record: July - September 2020 Stability Class - Extremely Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

1 1

0 0

2 NNE 2

0 0

0 2

NE 1

0 0

0 1

ENE 1

0 0

0 1

E 0

0 0

ESE 4

1 0

0 0

0 5

SE 3

0 0

0 3

SSE 6

0 0

0 6

S 5

0 0

0 5

SSW 12 0

0 0

12 SW 7

0 0

0 7

WSW 2

1 0

0 0

0 3

W 2

1 0

0 0

0 3

WNW 4

0 0

0 4

NW 0

1 0

0 0

0 1

NNW 2

1 0

0 0

0 3

Variable 0

0 0

Total 52 6

0 0

58 Hours of calm in this stability class:

1 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measureme in all stability classes:

0

2020 Annual Radioactive Effluent Release Report for TMI - Page 14 of 17 Three Mile Island Alpha Period of Record: October - December 2020 Stability Class - Extremely Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

0 3

0 0

3 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 1

0 0

0 1

SSE 0

2 1

0 0

0 3

S 0

1 6

0 0

0 7

SSW 0

2 2

1 0

0 5

SW 0

3 3

0 0

0 6

WSW 0

1 1

0 0

0 2

W 1

0 0

0 1

WNW 0

2 1

0 0

0 3

NW 0

1 6

0 0

0 7

NNW 0

4 3

0 0

0 7

Variable 0

0 0

Total 2

19 23 1

0 0

45 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 Three Mile Island Alpha Period of Record: October - December 2020 Stability Class - Moderately Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 0

0 0

ESE 0

0 0

SE 1

1 0

0 0

0 2

SSE 0

1 0

0 0

0 1

S 0

6 1

0 0

0 7

SSW 0

2 1

2 0

0 5

SW 1

1 2

0 0

0 4

WSW 0

1 0

0 0

0 1

W 0

0 2

0 0

0 2

WNW 0

1 2

0 0

0 3

NW 0

0 4

2 0

0 6

NNW 1

0 3

2 0

0 6

Variable 0

0 0

Total 3

13 15 6

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

2020 Annual Radioactive Effluent Release Report for TMI - Page 15 of 17 Three Mile Island Alpha Period of Record: October - December 2020 Stability Class - Slightly Unstable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

0 0

0 NNE 0

0 0

NE 0

0 0

ENE 0

0 0

E 1

0 0

0 1

ESE 1

0 0

0 1

SE 0

1 0

0 0

0 1

SSE 0

4 0

0 0

0 4

S 0

4 3

0 0

0 7

SSW 0

0 0

SW 0

1 1

0 0

0 2

WSW 0

0 1

0 0

0 1

W 0

0 1

0 0

0 1

WNW 0

0 3

0 0

0 3

NW 1

3 1

5 0

0 10 NNW 1

0 3

0 1

0 5

Variable 0

0 0

Total 4

13 13 5

1 0

36 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 Three Mile Island Alpha Period of Record: October - December 2020 Stability Class - Neutral - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

9 20 15 6

0 0

50 NNE 8

8 2

0 0

0 18 NE 8

15 4

0 0

0 27 ENE 5

18 3

0 0

0 26 E

3 14 25 0

0 0

42 ESE 15 17 2

0 0

0 34 SE 8

29 3

0 0

0 40 SSE 15 30 4

0 0

0 49 S

9 15 13 1

0 0

38 SSW 3

8 17 0

0 0

28 SW 5

17 11 4

0 0

37 WSW 8

5 20 11 0

0 44 W

5 17 26 21 0

0 69 WNW 7

15 45 36 7

0 110 NW 12 26 58 62 25 2

185 NNW 10 22 32 18 1

0 83 Variable 0

0 0

Total 130 276 280 159 33 2

880 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

2020 Annual Radioactive Effluent Release Report for TMI - Page 16 of 17 Three Mile Island Alpha Period of Record: October - December 2020 Stability Class - Slightly Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

17 19 2

0 0

0 38 NNE 10 7

0 0

17 NE 18 4

0 0

22 ENE 13 8

1 0

0 0

22 E

17 7

3 0

0 0

27 ESE 24 27 2

0 0

0 53 SE 24 42 9

1 0

0 76 SSE 22 36 7

3 0

0 68 S

17 24 4

1 0

0 46 SSW 11 14 7

0 0

0 32 SW 12 13 5

0 0

0 30 WSW 7

13 2

0 1

0 23 W

10 37 23 6

1 0

77 WNW 5

27 22 9

0 0

63 NW 16 21 18 12 2

0 69 NNW 15 24 5

5 0

0 49 Variable 0

0 0

Total 238 323 110 37 4

0 712 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 Three Mile Island Alpha Period of Record: October - December 2020 Stability Class - Moderately Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

9 2

0 0

11 NNE 4

1 0

0 0

0 5

NE 3

0 0

0 3

ENE 6

1 0

0 0

0 7

E 13 2

0 0

15 ESE 22 2

0 0

24 SE 20 6

0 0

26 SSE 28 5

0 0

33 S

29 1

0 0

30 SSW 29 4

3 0

0 0

36 SW 20 2

0 0

22 WSW 12 4

0 0

16 W

15 5

0 0

20 WNW 11 3

0 0

14 NW 6

9 1

0 0

0 16 NNW 7

3 2

0 0

0 12 Variable 0

0 0

Total 234 50 6

0 0

0 290 Hours of calm in this stability class:

10 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3

2020 Annual Radioactive Effluent Release Report for TMI - Page 17 of 17 Three Mile Island Alpha Period of Record: October - December 2020 Stability Class - Extremely Stable - 145Ft-31Ft Delta-T (F)

Winds Measured at 98 Feet Wind Speed (in mph)

Wind Direction 1 - 3 4 - 7 8 - 12 13 - 18 19 - 24

> 24 Total N

4 6

1 0

0 0

11 NNE 1

0 0

0 1

NE 0

1 0

0 0

0 1

ENE 2

0 0

0 2

E 6

0 0

0 6

ESE 17 1

0 0

18 SE 32 2

0 0

34 SSE 24 1

0 0

25 S

26 1

0 0

27 SSW 21 4

0 0

25 SW 8

1 0

0 0

0 9

WSW 2

0 0

0 2

W 5

1 0

0 0

0 6

WNW 2

1 0

0 0

0 3

NW 5

1 1

0 0

0 7

NNW 3

1 0

0 0

0 4

Variable 0

0 0

Total 158 21 2

0 0

0 181 Hours of calm in this stability class:

12 Hours of missing wind measurements in this stability class:

0 Hours of missing stability measurements in all stability classes:

3

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 4 Assessment of Radiation Doses Due to Radioactive Liquid and Gaseous Effluents Released from TMI During 2020 TMI-1 The attached table presents the maximum hypothetical doses to an individual and the general population resulting from TMI-1 releases of gaseous and liquid effluents. Provided below is a brief explanation of the table.

A.

Liquid (Individual)

Calculations were performed on the four age groups and seven organs recommended in Regulatory Guide 1.109. The pathways considered for TMI-1 were the consumption of drinking water and fish. These two pathways are considered to be the primary recreational activities associated with the Susquehanna River in the vicinity of TMI. The "critical receptor" or Receptor 1 was that individual who 1) consumed Susquehanna River water from the nearest downstream drinking water supplier (Wrightsville Water Supply) and 2) consumed fish residing in the vicinity of the TMI-1 liquid discharge.

For the calculated maximum whole body (or total body) dose from TMI-1 liquid effluents was 2.10E-02 mrem to an adult (line 1). The maximum organ dose was 2.69E-02 mrem to the liver of an adult (line 2).

B.

Gaseous (Individual)

There were five major pathways considered in the dose calculations for TMI-1 gaseous effluents. These were: (1) plume exposure (2) inhalation, consumption of; (3) cow milk, (4) vegetables and fruits and (5) meat.

Since there were no noble gases released from TMI-1 during 2020, the gamma and beta doses (lines 3 and 4 respectively) were zero.

The maximum organ dose due to the release of iodines, particulates and tritium from TMI-1 in was 2.39E-02 mrem to the liver, total body, thyroid, kidney, lung and G.I. tract of a child.

This dose again reflects the maximum exposed organ for the appropriate age group (line 5).

For TMI-1 liquid and gaseous effluents resulted in maximum hypothetical doses that were a small fraction of the quarterly and yearly ODCM dose limits.

2020 Annual Radioactive Effluent Release Report for TMI - Page 2 of 4 TMI-1

SUMMARY

OF MAXIMUM INDIVIDUAL DOSES FOR TMI-1 FROM January 1, 2019 through December 31, 2020 Effluent Applicable Organ Estimated Dose (mrem)

Age Group

% of ODCM Dose Limit ODCM Dose Limit (mrem)

Quarter Annual Quarter Annual (1) Liquid (2) Liquid Total Body Liver 2.10E-02 2.69E-02 Adult Adult 1.40E+0 4.86E-01 7.0E-01 2.43E-01 1.5 5

3 10 (3) Noble Gas (4) Noble Gas Air Dose (gamma-mrad)

Air Dose (beta-mrad) 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5

10 10 20 (5) Iodine, Tritium

& Particulates Liver, Total Body, Thyroid, Kidney, Lung, GI Tract 2.39E-02 Child 3.19E-01 1.60E-01 7.5 15

2020 Annual Radioactive Effluent Release Report for TMI - Page 3 of 4 TMI-2 The attached table presents the maximum hypothetical doses to an individual and the general population resulting from TMI-2 releases of gaseous and liquid effluents. Provided below is a brief explanation of the table.

A.

Liquid (Individual)

Calculations were performed on the four age groups and seven organs recommended in Regulatory Guide 1.109. The pathways considered for TMI-2 were the consumption of drinking water and fish. These two pathways are considered to be the primary recreational activities associated with the Susquehanna River in the vicinity of TMI. The "critical receptor" or Receptor 1 was that individual who 1) consumed Susquehanna River water from the nearest downstream drinking water supplier (Wrightsville Water Supply) and

2) consumed fish residing in the vicinity of the TMI-2 liquid discharge.

For the calculated maximum whole body (or total body) dose from TMI-2 liquid effluents was 4.74E-04 mrem to an adult (line 1). The maximum organ dose was 7.54E-04 mrem to the liver of a teen (line 2).

B.

Gaseous (Individual)

There were five major pathways considered in the dose calculations for TMI-2 gaseous effluents. These were: (1) plume exposure (2) inhalation, consumption of; (3) cow milk, (4) vegetables and fruits and (5) meat.

Since there were no noble gases released from TMI-2 during 2020, the gamma and beta air doses (lines 3 and 4, respectively) were zero.

The maximum organ dose due to the release of particulates and tritium from TMI-2 in was 4.62E-05 mrem to the liver, total body, thyroid, kidney, lung, and GI tract of a child (line 5).

For TMI-2 liquid and gaseous effluents resulted in maximum hypothetical doses that were a small fraction of the quarterly and yearly ODCM dose limits.

2020 Annual Radioactive Effluent Release Report for TMI - Page 4 of 4 TMI-2

SUMMARY

OF MAXIMUM INDIVIDUAL DOSES FOR TMI-2 FROM January 1, 2019 through December 31, 2020 Effluent Applicable Organ Estimated Dose (mrem)

Age Group

% of ODCM Dose Limit ODCM Dose Limit (mrem)

Quarter Annual Quarter Annual (1) Liquid (2) Liquid Total Body Liver 4.74E-04 7.54E-04 Adult Teen 3.16E-02 1.51E-02 1.58E-02 7.54E-03 1.5 5

3 10 (3) Noble Gas (4) Noble Gas Air Dose (gamma-mrad)

Air Dose (beta-mrad) 0 0

0 0

5 10 10 20 (5) Tritium &

Particulate Liver, Total Body, Thyroid, Kidney, Lung &

GI Tract 4.62E-05 Child 6.16E-04 3.08E-04 7.5 15

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 2 Assessment of Radiation Doses from Liquid and Gaseous Effluents Releases to Members of the Public within the TMI Site Boundaries During 2020 The Offsite Dose Calculation Manual requires an assessment of the radiation doses from radioactive liquid and gaseous effluents to members of the public due to their activities inside the site boundary during the reporting period. The estimated dose to a member of the public at or within the TMI Site Boundary 1.89E-2 mrem for 2020.

The following are the assumptions made in this assessment:

Access to the TMI Owner Controlled Area is limited to only those persons who have business related activities that support the operation of the facility. Therefore, based on the definition of a member of the public in NUREG-1301, there is no credible scenario for this individual to receive non-occupational dose inside the TMI Owner Controlled Area.

The scenario selected will be recreational use of the Susquehanna River and shoreline next to the Owner Controlled Area fence. Based on the two definitions of Site Boundary in the ODCM, this scenario is AT the Site Boundary for liquid releases but INSIDE the Site Boundary for gaseous releases.

A member of the public stays next to the owner controlled area for 67 hours7.75463e-4 days 0.0186 hours 1.107804e-4 weeks 2.54935e-5 months . The 67 hours7.75463e-4 days 0.0186 hours 1.107804e-4 weeks 2.54935e-5 months is based upon Reg. Guide 1.109 shoreline recreation period given in Table E-5.

This is a table of recommended values to be used for the maximum exposed individual in lieu of site-specific data. Three Mile Island is co-located with other islands in the Lake Frederick area of the Susquehanna River. This area is used recreationally for boating and fishing over the summer months. The application of the 67 hours7.75463e-4 days 0.0186 hours 1.107804e-4 weeks 2.54935e-5 months of recreational use from Reg. Guide 1.109 is appropriate.

The highest dose from liquid releases is characterized by release L20201019-927-C. This release was from U-1 Turbine Plant Discharge. The total body dose from release L20201019-927-C was 4.47E-03 mrem.

The highest dose from a single airborne release is characterized by release G20200107-475-C. This release was from TMIs Unit 1 ventilation system. The release contained airborne tritium from spent fuel pool evaporation. This release occurred over 167.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months . The entire dose from this release will be applied to the 67 hour7.75463e-4 days 0.0186 hours 1.107804e-4 weeks 2.54935e-5 months recreational use period. The application of the total dose from this release to 67 hours7.75463e-4 days 0.0186 hours 1.107804e-4 weeks 2.54935e-5 months is conservative. The maximum individual dose from release G20200107-475-C was 1.44E-02 mrem to the thyroid of a child.

2020 Annual Radioactive Effluent Release Report for TMI - Page 2 of 2 The highest fenceline direct radiation result (assumed to be equal to dose) will be added to the dose from the highest liquid and gaseous releases to yield the hypothetical maximum dose to a member of the public within the site boundaries.

Using the new ANSI/HPS Standard N13.37, Environmental Dosimetry, as suggested in DG-4019 to calculate facility related dose, the highest facility related dose detected at any of the monitoring locations was 0.000 mR.

Calculations:

The dose from liquid release L20201019-927-C was 0.00447 mrem.

The dose from gas release G20200107-475-C was 0.0144 mrem.

Total Dose Calculation 0.00447 mrem + 0.0144 mrem + 0.000 mrem = 0.0189 mrem

2020 Annual Radioactive Effluent Release Report for TMI - Page 1 of 1 Assessment of Radiation Dose to Most Likely Exposed Real Individual per 40 CFR 190 Dose calculations were performed to demonstrate compliance with 40 CFR 190 (ODCM Part IV Section 2.10). Gaseous and liquid effluents released from TMI-1 and TMI-2 in 2020 resulted in maximum individual doses (regardless of age group) of 0.034 mrem to the thyroid and 0.052 mrem to any other organ including the whole (total) body.

2020 Annual Radioactive Effluent Release Report for TMI 0 - Page 1 of 1 Deviations from the ODCM Sampling and Analysis Regime During 2020 Per Table 3.2-1, a weekly composite is required from a continuous release source. On two occasions, there was no sample in the compositor for the turbine building sump. On both occasions, the flow totalizer for the turbine building sump was unchanged. This indicated there was no flow from this sump for the week. Therefore, there was nothing to collect. There was no sampling equipment malfunction. These events are documented in IRs 04369213 and 04391433.

There were no other sampling deviations.

2020 Annual Radioactive Effluent Release Report for TMI 1 - Page 1 of 1 Major Changes to Radioactive Waste Treatment Systems The following information is for inclusion in the TMI-1/2 Radiological Effluents Report pursuant to Tech Spec Amendment 284.

UFSAR Section 11.2.6 requires reporting of Major changes to Radioactive Waste Treatment Systems. Major changes are interpreted to mean changes that would alter how the system functions or changes that would affect operational exposures, offsite dose rates or integrated doses. There were no major changes to the liquid, gaseous, or solid radioactive waste treatment systems at TMI-1 during the year of 2020.

TMI-21-017, Submittal of 2020 Annual Radiological Effluent Release Report

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TMI-21-017, Submittal of 2020 Annual Radiological Effluent Release Report

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