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Annual Radiological Groundwater Protection Program Report 1 January 2015 Through 31 December 2015
	ML16153A190
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Site:	Peach Bottom
Issue date:	05/31/2016
From:	; Teledyne Brown Engineering Environmental Services
To:	; Office of Nuclear Reactor Regulation
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Docket No: 50-277 50-278 PEACH BOTTOM ATOMIC POWER STATION UNITS 2 and 3 Annual Radiological Groundwater Protection Program Report 1 January 2015 Through 31 December 2015 Prepared By Teledyne Brown Engineering Environmental Services

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Peach Bottom Atomic Power Station Delta, PA 17314 May 2016

Table of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction ...................................................................................................................... 2 A. Objectives of the RGPP ....................................................................................... 2

8. Implementation of the Objectives ........................................................................ 3 C. Program Description ............................................................................................ 3 D. Characteristics of Tritium (H-3) ............................................................................ 4 Ill. Program Description ....................................................................................................... 5 A. Sample Analysis .................................................................................................. 5 B. Data Interpretation ................................................................................................ 5 C. Background Analysis ........................................................................................... 6

1. Background Concentrations of Tritium ...................................................... 6 IV. Results and Discussion ................................................................................................. 8 A. Groundwater Results ........................................................................................... 8

8. Surface Water Results ....................................................................................... 10 C. Precipitation Water Results ............................................................................... 11 D. Drinking Water Well Survey............................................................................... 11 E. Summary of Results - Inter-laboratory Comparison Program ........................... 11 F. Leaks, Spills, and Releases ............................................................................... 11 G. Trends ............................................................................................................... 12 H. Investigations ..................................................................................................... 13 I. Actions Taken .................................................................................................... 14 J. Deviations ........................................................................................................... 15 V. References ................................................................................................................... 15

Appendices Appendix A Sampling Locations, Distance and Direction Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Peach Bottom Atomic Power Station, 2015 Figures Figure A-1 Well Water Locations, Peach Bottom Atomic Power Station, 2015 Figure A-2 RGPP Monitoring Locations, Peach Bottom Atomic Power Station, 2015 Appendix B Data Tables Tables Table B-1.1 Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Groundwater and Seep Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2015.

Table B-1.2 Concentrations of Gamma Emitters in Groundwater and Seep Water Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2015.

Table B-1.3 Concentrations of Hard-to-Detects in Groundwater Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2015.

Table B-11.1 Concentrations of Tritium in Surface Water Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2015.

Table B-11.2 Concentrations of Gamma Emitters in Surface Water Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2015.

Table B-111.1 Concentrations of Tritium in Precipitation Water Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2015.

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I. Summary and Conclusions This report on the Radiological Groundwater Protection Program (RGPP) conducted for the Peach Bottom Atomic Power Station (PBAPS) by Exelon Nuclear covers the period 01 January 2015 through 31 December 2015. This evaluation involved numerous station personnel and contractor support personnel. At PBAPS, there are 31 permanent groundwater monitoring wells.

Installation of the wells began in 2006. Of these monitoring locations, none were assigned to the station's Radiological Environmental Monitoring Program (REMP). This is the ninth in a series of annual reports on the status of the RGPP conducted at PBAPS. This report covers groundwater, surface water, seep 1

water and precipitation water samples collected from the environment on station property in 2015. During that time period, 686 analyses were performed on more than 218 samples from 41 locations. These 41 locations include 27 groundwater monitoring wells, 3 surface water sample points, 3 groundwater seeps and 2 yard drain sumps (groundwater) and 6 precipitation water sampling points. Phase 1 of the monitoring was part of a comprehensive study initiated by Exelon to determine whether groundwater or surface water in the vicinity of PBAPS had been adversely impacted by any releases of radionuclides. Phase 1 was conducted by Conestoga Rovers and Associates (CRA) and the conclusions were made available to state and federal regulators as well* as the public. Phase 2 of the RGPP was conducted by Exelon corporate and station personnel to initiate follow up of Phase 1 and begin long-term monitoring at groundwater and surface water locations selected during Phase 1. All analytical results from Phase 2 monitoring are reported herein.

Samples supporting the RGPP were analyzed for Tritium, Strontium-89 (Sr-89),

Strontium-90 (Sr-90), gross alpha, gross beta, gamma-emitting radionuclides associated with licensed plant operations and isotopes known as 'hard to detects'.

In assessing all the data gathered for this report, it was concluded that the operation of PBAPS had no adverse radiological impact on the environment and there are currently no known active releases into the groundwater at PBAPS.

Tritium was detected in 3 samples at one location in concentrations greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission [NRC] Reporting Limit) of

.20,000 pCi/L. These samples ranged from 21,100 to 37,700 pCi/L.

Tritium was not detected at concentrations greater than the minimum detectable concentration (MDC) in any surface water, seep water or precipitation water sample locations. Based on the sample data tritium is not migrating off the station property at detectable concentrations.

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II. Introduction PBAPS is located along the Susquehanna River between Holtwood and Conowingo Dams in Peach Bottom Township, York County, Pennsylvania. The initial loading of fuel into Unit 1, a 40 MWe (net) high temperature gas-cooled reactor, began on 5 February 1966, and initial criticality was achieved on 3 March 1966. Shutdown of Peach Bottom Unit 1 for decommissioning was on 31 October 1974. For the purposes of the monitoring program, the beginning of the operational period for Unit 1 was considered to be 5 February 1966. A summary of the Unit 1 preoperational monitoring program was presented in a previous report <1l. PBAPS Units 2 and 3 are boiling water reactors, each with a power output of approximately 1366 MWe. The first fuel was loaded into Peach Bottom Unit 2 on 9 August 1973.

Criticality was achieved on 16 September 1973 and full power was reached on 16 June 1974. The first fuel was loaded into Peach Bottom Unit 3 on 5July1974.

Criticality was achieved on 7 August 1974 and full power was first reached on 21 December 1974. Preoperational summary reports <2l<3l for Units 2 and 3 have been previously issued and summarize the results of all analyses performed on samples collected from 5 February 1966 through ~ August 1973.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2015.

A Objective of the RGPP The objectives of the RGPP are as follows:

. 1. Ensure that the site characterization of geology and hydrology provides an understanding of predominant groundwater gradients based upon current site conditions.

2. Identify site risk based on plant design and work practices.

3. Establish an on-site groundwater monitoring program to ensure timely detection of inadvertent radiological releases to ground water.

4. Establish a remediation protocol to prevent migration of licensed material off-site and to minimize decommissioning impacts.

5. Ensure that records of leaks, spills, remediation efforts are retained and retrievable to meet the requirements of 10 CFR 50. 75(g).

6. Conduct initial and periodic briefings of their site specific Groundwater Protection Initiative (GPI) program with the designated State/Local officials.

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7. Make informal communication as soon as practicable to appropriate State/Local officials, with follow-up notifications to the NRC, as appropriate, regarding significant on-site leaks/spills into groundwater and on-site or off-site water sample results exceeding the criteria in the REMP as described in the OCDM.

8. Submit a written 30-day report to the NRC for any water sample result for on-site groundwater that is or may be used as a source of drinking water that exceeds any of the criteria in the licensee's existing REMP/ODCM for 30-day reporting of off-site water sample results.

9. Document all on-site groundwater sample results and a description of any significant on-site leaks/spills into groundwater for each calendar year in the Annual Radiological Environmental Operating Report (ARE OR) for REMP or the Annual Radioactive ,,Effluent Release Report (ARERR).

10. Perform a self-assessment of the GPI program.

11. Conduct a review of the GPI program, including at a minimum the licensee's self assessments, under the auspices of the Nuclear Energy Institute (NEI).

B. Implementation of the Objectives The objectives identified have been implemented at PBAPS via Corporate and Site specific procedures. These procedures include:

1. EN-AA-407, Response to Inadvertent Releases of Licensed Materials to Groundwater, Surface Water or Soil.

2. EN-AA-408, Radiological Groundwater Protection Program

3. EN-AA-408-4000, Radiological Groundwater Protection Program Implementation.

4. EN-PB-408-4160, Peach Bottom RGPP Reference Material C. Program Description

1. Sample Collection Sample locations can be found in Table A-1 and Figures A-1 and A-2, Appendix A.

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Groundwater. Surface Water and Precipitation Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures. Groundwater, surface water, and precipitation water are collected. Sample locations, sample collection frequencies and analytical frequencies are controlled in accordance with approved station procedures.

Contractor and/or station personnel are trained in the collection, preservation management and shipment of samples, as well as in documentation of sampling events. Analytical laboratories are subject to internal quality assurance programs, industry cross-check programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables as data are received. .

Analytical data results are reviewed by both station personnel and an independent hydro geologist for adverse trends or changes to hydrogeologic conditions.

D. Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.

Tritiated water behaves the same as ordinary water iri both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food or absorption through skin. Once tritium enters the body it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion essentially all tritium is cleared.

Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity and in special production reactors, where the isotopes lithium-7 (Li-7) and/or boron-10 (B-10) are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

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Tritium has a half-life of approximately 12.3 years. It decays spontaneously to helium-3 (He-3). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium emits a low energy beta particle and leaves the body relatively quickly. Since tritium is almost always found as water, it goes directly into soft tissues and organs.

The associated dose to these tissues is generally uniform and is dependent on the water content of the specific tissue.

Ill. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TSE and Environmental Inc. Midwest Laboratories (EIML) to analyze the environmental samples for radioactivity for the PBAPS RGPP in 2015.

In order to achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of gamma emitters in groundwater and surface water.

2. Concentrations of strontium in groundwater.

3. Concentrations of tritium in groundwater, surface water and precipitation water.

4. Concentrations of 'hard-to-detect' isotopes (Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-233/234, U-235, U-238, Fe-55 and Ni-63) in groundwater. These analyses are required based on tritium results.

B. Data Interpretation The radiological data collected prior to PBAPS becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, PBAPS was considered operational at initial criticality. Several factors were important in the interpretation of the data:

1. Lower Limit of Detection The lower limit of detection (LLD) is a minimum sensitivity value that must be achieved routinely by the analytical parameter.

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2. Laboratory Measurements Uncertainty The estimated uncertainty in measurement of tritium in environmental samples is frequently on the order of 50% of the measurement value.

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated.

Exelon reports the TPU by following the result with plus or minus +/-

the estimated sample standard deviation as TPU that is obtained by propagating all sources of analytical uncertainty in measurements.

Analytical uncertainties are reported at the 95% confidence level in this report for reporting consistency with the AREOR.

Gamma spectroscopy results for each type of sample were grouped as follows:

For groundwater and surface water 12 nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, 1-131, Cs-134, Cs-137, Ba-140 and La-140 are measured.

C. Background Analysis A pre-operational REMP was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, marine life and foodstuffs. The results of the monitoring were detailed in the report entitled PBAPS, Environs Radiation Monitoring Program, Preoperational Summary Report Units 2 and 3, September 1970- August 1973, January 1974 and PBAPS, Environs Radiation Monitoring Program,* Preoperational Summary Report Units 2 and 3, June 1977. The pre-operational REMP contained analytical results from samples collected from the surface water, discharge, well and rain water.

1. Background Concentrations of Tritium The purpose of the following discussion is to summarize 6

background measurements of tritium in various media performed by others. Additional detail may be found by consulting references (CRA 2006)<1>.

a. Tritium Production Tritium is created in the environment from naturally occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, "Cosmogenic" tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle. Below ground, "lithogenic" tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

A major anthropogenic source of tritium and strontium-90 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 1950s and early 1960s and later with additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue to influence tritium concentrations in the environment.

b. Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPA's RadNet database. GNIP provides tritium precipitation concentration data for samples collected worldwide from 1960 to 2006.

RadNet provides tritium precipitation concentration data for samples collected at stations throughout the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric 7

testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations have typically been below 100 pCi/L since around 1980.

Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

c. Surface Water Data Surface water level measurements were collected at the surface water monitoring locations during the groundwater level measurement event. The purpose of the surface water monitoring was to provide surface water elevation data to evaluate the groundwater/surface water interaction at the Station.

The USEPA RadNet surface water data typically has a reported 'Combined Standard Uncertainty' of 35 to 50 pCi/L.

According to USEPA, this corresponds to a+/- 70 to 100 pCi/L 95% confidence bound on each given measurement.

Therefore, the typical background data provided may be subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

The radio-analytical laboratory is counting tritium results to an Exelon specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 -

240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

IV. Results and Discussion A. Groundwater Results Groundwater Samples were collected from on-site wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

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Tritium Samples from 41 locations were analyzed for tritium activity (Tables_

B-1.1, B-11.1 and B-111.1, Appendix B). Tritium values ranged from the detection limit to 37,700 pCi/L. Tritium was not detected in wells at or near the owner-controlled boundary. The location most representative of potential offsite user of drinking water is less than the MDC (Table B-1.1, Appendix B).

Low levels of tritium were detected at concentrations greater than the minimum detectable concentration (MDC) in 12 of 27 groundwater monitoring wells and 1 yard drain sump location. The tritium concentrations ranged from 174 pCi/L to 37,700 pCi/L (Table B-1.1, Appendix B) .

. No tritium was detected in any surface water samples (Table B-11.1, Appendix B). No tritium was detected in any precipitation water samples (Table B-111.1, Appendix B).

Strontium Sr-89 and Sr-90 were not detected in any of the samples {Table B-1.1, Appendix B):

Gross Alpha and Gross Beta (dissolved and suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during 2015.

Gross Alpha (dissolved) was detected in 5 of 25 groundwater locations analyzed. The concentrations ranged from 1.4 to 5.7 pCi/L.

Gross Alpha (suspended) was detected in 6 of 25 groundwater locations analyzed. The concentrations ranged from 1.1 to 12.1 pCl/L.

Gross Beta (dissolved) was detected in all 25 groundwater locations analyzed. The concentrations ranged from 1.2 to 30.3 pCi/L.

Gross Beta (suspended) was detected in 6 of 25 groundwater locations analyzed. The concentrations ranged from 2.4 to 10.4 pCi/L.

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The activity detected is consistent with historical levels. The activity detected is naturally occurring and the levels are considered to be background (Table 8-1.1, Appendix 8).

Hard-To-Detect Hard-To-Detect analyses were performed on a select group of groundwater and surface water locations to establish baseline levels. The analyses for groundwater included iron-55 (Fe-55),

nickel-63 (Ni-63), americium-241 (Am-241), curium-242 (Cm-242),

Cm-243/244, plutonium-238 (Pu-238), Pu-239/240, uranium-234 (U-234), U-235 and U-238.

U-234 was detected in 11 of 22 groundwater monitoring locations analyzed. The concentrations ranged from 0.15 to 10.1 pCi/L.

U-235 was detected in 2 of 22 groundwater monitoring locations analyzed. The concentrations ranged from 0.19 to 0.24 pCi/L.

U-238 was detected in 8 of 22 groundwater monitoring locations analyzed. The concentrations ranged from 0.20 to 8.85 pCi/L. No plant produced radionuclides were detected.

The activity detected is naturally occurring and the levels are considered to be background (Table 8-1.3, Appendix 8).

Gamma Emitters No power-production gamma emitters were detected in any of the samples (Table 8-1.2, Appendix 8).

8. Surface Water Results Surface Water Samples were collected from surface water locations throughout the year in accordance with the station radiological groundwater protection program. Analytical results are discussed below.

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Tritium Samples from three locations were analyzed for tritium activity.

Tritium was not detected in any samples (Table B-11.1, Appendix B).

Gamma Emitters No power-production gamma emitters were detected in any of the samples. No other gamma emitting nuclides were detected (Table B-11.2, Appendix B).

C. Precipitation Water Results Precipitation Water Samples were collected at six locations (1A, 18, 1S, 1SSE, 1Z, and 4M). The following analysis was performed:

Tritium Samples from six locations were analyzed for tritium activity. Tritium activity was not detected in any samples (Table B-111.1, Appendix B).

D. Drinking Water Well Survey A drinking water well survey was conducted during the summer 2006 by CRA (CRA 2006)< 1> around the PBAPS. The water well inventory was updated in 2012<4>, The updated water well database search indicated a new water well off Station property within a one mile radius of the Station.

The well is described as a "test" well and its use is listed as "unused". In summary, there were no significant changes in off Station groundwater use from 2006-2012.

E. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE and Environmental Inc. (Midwest Labs) are presented in the AREOR.

F.

Leaks, Spills and Releases An inadvertent release of licensed material occurred in April 2015, increasing tritium activity in groundwater monitoring wells located east of the Unit 3 Turbine Building.

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Quarterly samples of groundwater monitoring wells were obtained the week of April 6, 2015 in accordance with the requirements of EN-AA-408-4000, Radiological Groundwater Protection Program (RGPP)

Implementation. Results of the sampling were received on April 16, 2015.

The results from groundwater monitoring well samples east of the Unit 3 Turbine Building revealed an increase in tritium activity. Monitoring well MW-PB-25 tritium activity was 37,700 pCi/L from a sample obtained on April 7, 2015. The previous tritium activity in a sample obtained from this well on January 5, 2015 was 8,890 pCi/L.

Increases in tritium activity in three additional wells located east of the Unit 3 Turbine Building were also identified from samples obtained on April 7, 2015. Tritium activity in these wells were as follows; MW-PB-24, 841 pCi/L; MW-PB-26, 1,740 pCi/L; MW-PB-27, 2,500 pCi/L. Tritium activity from these wells ranged from less than minimum detectable activity to 602 pCi/L during the January 2015 sampling.

On April 17, 2015, the elevated activity in MW-PB-25 was confirmed. Per LS-AA-1120, Reportable Event RAD 1.34, voluntary informal communication to designated State/Local officials shall be made before the end of the next business day. On April 20, 2015, voluntary informal communications were delivered to the Nuclear Regulatory Commission, Pennsylvania Bureau of Radiation Protection, American Nuclear Insurers and Nuclear Energy Institute due to the groundwater monitoring well tritium activity increase. The voluntary informal communications were completed within the time limit required by LS-AA-1120, Reportable Event RAD 1.34.

The investigation found that condensed steam pooled on the Unit 3 Turbine Building Moisture Separator Area floor due to a raised floor drain.

This water leaked through a small opening nearby to the ground below, increasing tritium activity in the wells adjacent to the building.

The floor drain was modified to allow water to flow into the drain. Activity in the monitoring wells adjacent to the Unit 3 Turbine Building has been on a decreasing trend since the modification.

G. Trends A tritium plume has been identified northeast of the Unit 3 Turbine Building. The plume extends eastward toward well MW-PB-4. The plume is bounded on the north by wells MW-PB-12 and MW-PB-22. The plume is bounded on the south by wells MW-PB-20 and MW-PB-21.

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Wells MW-PB-24, 25, 26 and 27 were each sampled and analyzed 20 times during 2015. On all occasions, MW-PB-25 samples had the highest tritium activity.

After modifications to the floor drain as described above, the wells exhibited decreasing or steady trends for the remainder of 2015.

H. Investigations MW-PB-4 In 2006, monitoring wells MW-PB-1 through MW-PB-14 were installed. Tritium activity was detected in MW-PB-4, located north of the

unit 3 Circulating Water Pump Structure and MW-PB-12, north of the Administration Building. Groundwater flow on site is from west to east.

Monitoring wells were installed to the west, southwest and northwest of monitoring wells MW-PB-4 and MW-PB-12. The wells with the highest tritium activity are the wells installed directly east of and adjacent to the Unit 3 Turbine Building, wells MW-PB-24, 25, 26 and 27.

Investigation of potential sources identified that the likely source of groundwater contamination was due to degraded floor seams in the Unit 3 Turbine Building Moisture Separator area 116' elevation. Leaks internal to the building entered the groundwater through the degraded floor seams.

The floor seams were repaired in August 2010. The floor in the Unit 3 Turbine Building Moisture Separator area 116' elevation was sealed and recoated in October 2011.

MW-PB-29, 30 and 31 An extent-of-condition inspection of the Unit 2 Turbine-Building Moisture Separator area 116' elevation floor was performed in October 2010. Minor degradation of the floor seams was identified and repaired.

In May 2011, monitoring wells MW-PB-29 and 30 were installed directly east of and adjacent to the Unit 2 Turbine Building; MW-PB-31 was installed southeast of and adjacent to the Unit 2 Turbine Building. These wells were installed to determine if a condition existed east of the Unit 2 Turbine Building that is similar to the condition east of the Unit 3 Turbine Building.

Wells MW-PB-29, 30 and 31 were sampled quarterly in 2015. Tritium activity in the wells ranged from less than the MDC to 841 pCi/L. Samples from these wells were also analyzed for gamma emitting isotopes and hard to detect radionuclides. All results were less than the MDC for each isotope.

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The Unit 2 Turbine Building Moisture Separator area 116' elevation floor was sealed and recoated in October 2012. Groundwater intrusion into a ventilation pit on the east side of the area was identified. The groundwater was removed and degraded seams in the ventilation pit were successfully repaired.

MW-PB-24, 25, 26 and 27 Wells MW-PB-24, 25, 26 and 27 are considered the wells of primary interest. These wells were sampled on a frequency ranging from weekly to quarterly. Below are 3 tables. The first lists the highest tritium activity of the wells of primary interest and the date of the sampling. The second table lists the highest tritium activity of the wells during 2015. The third table lists the activity of the wells from the last sampling of 2015. The tritium activity is in pCi/L.

Well# Tritium Activity Date MW-PB-24 33,500 3/15/2010 MW-PB-25 161,000 3/8/2010 MW-PB-26 196,000 3/8/2010 MW-PB-27 71,800 2/22/2010 Well# Tritium Activity Date MW-PB-24 2,180 8/2/2015 MW-PB-25 37,700 4/8/2015 MW-PB-26 1,740 4/8/2015 MW-PB-27 2,500 4/8/2015 Well# Tritium Activity Date MW-PB-24 619 12/15/2015 MW-PB-25 8,680 12/15/2015 MW-PB-26 324 12/15/2015 MW-PB-27 1,170 12/15/2015 Potential sources of tritium in the groundwater are investigated via procedural processes and documented in the corrective action program.

The most likely pathway for tritium to enter the groundwater has been determined to be leaks internal to the Unit 3 Turbine Building Moisture Separator 116', migrating through degraded floor seams or other unidentified openings in the floor.

I. Actions Taken

1. As previously described, a floor drain in the Unit 3 Turbine Building M/S area was modified to allow water to flow into the drain. Activity in 14

the monitoring wells adjacent to the Unit 3 Turbine Building has been on a decreasing trend since the modification.

2. Installation of Monitoring Wells No groundwater monitoring wells were installed in 2015.

3. Actions to Recover/Reverse Plumes There were no actions to recover the plume.

J. Deviations The data tables show that duplicate samples were obtained at several wells during 2015. These duplicate samples were obtained and analyzed for quality control purposes.

There are no additional deviations to report.

V. References

1. Conestoga Rovers and Associates, Fleetwide Assessment, Peach Bottom Atomic Power Station, Delta, PA, Fleetwide Assessment, Rev. 1, September 1, 2006.

2. Peach Bottom Atomic Power Station, Environs Radiation Monitoring Program, Preoperational Summary Report units 2 and 3, June 1977.

3. Peach Bottom Atomic Power Station, Environs Radiation Monitoring Program, Preoperational Summary Report units 2 and 3, September 1970-August 1973, January 1974.

4. Conestoga Rovers and Associates, Hydrogeologic Investigation Report, Peach Bottom Atomic Power Station, November 2012.

5. AMO Environmental Decisions, 2015 RGPP Summary Monitoring Report, May2015, July 2015, October 2015 and February 2016.

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APPENDIX A SAMPLING LOCATIONS, DISTANCE AND DIRECTION

TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Peach Bottom Atomic Power Station, 2015 Site Site Type Sector Distance (ft.)

MW-PB-1 Groundwater Well SW 1, 166.6 MW-PB-2 Groundwater Well WNW 309.0 MW-PB-3 Groundwater Well SSE 709.7 MW-PB-4 Groundwater Well ENE 350.2 MW-PB-5 Groundwater Well NNW 1,146.1 MW-PB-6 Groundwater Well NE 1,072.4 MW-PB-7 Groundwater Well SE 813.9 MW-PB-8 Groundwater Well SE 1,167.0 MW-PB-9 Groundwater Well SE 2,816.9 MW-PB-10 Groundwater Well SSE 1,125.1 MW-PB-11 Groundwater Well SE 438.4 MW-PB-12 Groundwater Well NNE 317.2 MW-PB-13 Groundwater Well NW 329.4 MW-PB-14 Groundwater Well s 1,231.2 MW-PB-15 Groundwater Well SE 1,087.9 MW-PB-16 Groundwater Well SE 1, 101.6 MW-PB-17 Groundwater Well SE 1,005.4 MW-PB-18 Groundwater Well SE 1,010.0 MW-PB-19 Groundwater Well NW 226.8 MW-PB-20 Groundwater Well E 260.5 MW-PB-21 Groundwater Well E 363.3 MW-PB-22 Groundwater Well NE 315.4 MW-PB-24 Groundwater Well N 185.9 MW-PB-25 Groundwater Well N 159.7 MW-PB-26 Groundwater Well NNE 121.1 MW-PB-27 Groundwater Well NNE 139.1 MW-PB-28 Groundwater Well NW 249.6 MW-PB-29 Groundwater Well SE 325.0 MW-PB-30 Groundwater Well SE 379.2 MW-PB-31 Groundwater Well SE 450.1 SW-PB-1 Surface Water NNW 2,850.5 SW-PB-5 Surface Water SE 675.1 SW-PB-6 Surface Water SE 1,305.9 SP-PB-1 Groundwater Seep s 514.2 SP-PB-2 Groundwater Seep WNW 311.6 SP-PB-3 Groundwater Seep NNW 1,281.1 U/2 YARD DRAIN SUMP Groundwater SSE 498.7 U/3 YARD DRAIN SUMP Groundwater WSW 175.8 1A Precipitation Water ESE 1,271 1B Precipitation Water NW 2,587 1S Precipitation Water s 1,315 1SSE Precipitation Water SSE 1,312 1Z Precipitation Water SE 1,763 4M Precipitation Water SE 45,989 A-1

0 1-MILE RADIUS 0

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INFORM.\ llON CENTER LEGEND 12 13 1.-

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.# PROPERTY BOUNDARY ALL LOCATIONS APPROXIMATE (NOT FIELD VER IFIED)

SOURCE USGS QUADRANGLE MAPS, HOLTV\IOOO. PA - 19116 WAKEFlfLO PA

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!~ LON - SOI/TH SUBSTATION EXELON SUPPLY WELL (NON-POTABLE) 21 '48311113 STOL'IZFUS WATER WELL LOCATIONS Exelon_ PEACH BOTTOM ATOMIC POWER STATION EXELON GENERATION COMPANY, LLC

~ Delta, Pennsylvania 53539-12(005)GN-WA008 NOV 612012 Figure A-1 Well Water Locations, Peach Bottom Atomic Power Station, 2015 A-2

SWPB-1 SP-PB-3

IWV-PB-6 rvw-PB-12 IWV-PB-13 # # # IWV-PB-22 rvw-PB-19 # # IWV-PB4 rvw-PB-27 IWV-PB-2 # IWV-PB-26 #

rvw-PB-28 _ _ _ ____,/ rvw-PB-~ rvw-PB-21 U'3 Yard Drain fl SP-PB-2 IWV-Pf29 # IWV-PB-11 U'2 Yard Drain# # 1WV-PB-30 # SWPB-5 11

IWV-PB-31 0 #

SP-PB-1 IWV-PB-7 IWV-Pft-3

rvw-PB-17

rvw-PB-18 rvw-PB-1 IWV-PB-15 t IWV-PB-16 rvw-PB-10 # rvw-PB-8

SWPB-6 IWV-PB-14 rvw-PB-9 1000 0 1000 Fea

RGFP S...rface Weter and Groundwater Sn1>fe Loations Figure A-2 RGPP Monitoring Locations, Peach Bottom Atomic Power Station , 2015 A-3

APPENDIX B DATA TABLES

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER AND SEEP SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-8 (Dis) Gr-8 (Sus)

MW-P8-1 04/10/15 < 190 MW-P8-10 01/07/15 < 163 MW-P8-10 04/06/15 < 193 < 2.9 < 0.9 < 8.7 < 5.5 9.7 +/- 5.0 10.4 +/- 2.8 MW-P8-10 07/08/15 < 193 MW-P8-10 11/04/15 < 191 MW-P8-11 01/06/15 < 162 MW-P8-11 01/06/15 < 165 MW-P8-11 04/08/15 < 194 < 4.4 < 0.7 < 1.5 1.7 +/- 1.0 2.8 +/- 0.9 < 1.7 MW-P8-11 07/07/15 < 191 MW-P8-11 11/04/15 < 192 MW-P8-12 01/06/15 < 164 MW-P8-12 04/06/15 < 192 < 5.2 < 0.6 < 0.6 < 0.8 1.2 +/- 0.6 < 1.6 MW-P8-12 07/07/15 < 192 MW-P8-12 12/04/15 Original 191 +/- 125 MW-P8-12 12/04/15 Recount 219 +/- 130 MW-P8-12 12/04/15 Rerun 323 +/- 135 MW-P8-13 01/06/15 < 166 MW-P8-13 04/07/15 Original < 197 < 3.8 < 0.4 < 16.0 < 4.1 30.3 +/- 8.0 < 3.5 MW-P8-13 04/23/15 Original 401 +/- 138 MW-P8-13 04/23/15 Rerun 443 +/- 133 MW-P8-13 05/11/15 206 +/- 113 MW-P8-13 07/07/15 240 +/- 133 MW-P8-13 08/03/15 337 +/- 136 MW-P8-13 11/04/15 252 +/- 133 MW-P8-14 04/06/15 < 188 MW-P8-15 01/07/15 < 166 MW-P8-15 04/06/15 < 192 < 4.1 < 0.5 < 1.2 < 0.8 12.2 +/- 1.5 < 1.6 MW-P8-15 07/08/15 < 194 MW-P8-15 11/05/15 < 189 MW-P8-16 01/07/15 < 164 MW-P8-16 04/06/15 < 189 < 5.0 < 0.6 5.7 +/- 1.2 5.9 +/- 1.5 9.4 +/- 1.0 2.4 +/- 1.2 MW-P8-16 07/08/15 < 192 MW-P8-16 11/05/15 < 189 MW-P8-19 01/06/15 < 165 MW-P8-19 01/06/15 < 163 MW-P8-19 04/07/15 < 187 < 5.4 < 0.8 < 0.6 < 1.1 2.1 +/- 0.6 < 1.6 MW-P8-19 07107115 < 196 MW-P8-19 07/07/15 TBE < 195 MW-P8-19 07107115 EIML 215 +/- 86 MW-P8-19 11/04/15 T8E < 171 MW-P8-19 11/04/15 T8E < 193 MW-P8-19 11/04/15 EIML < 151 MW-P8-2 01/06/15 < 168 MW-P8-2 04/07/15 < 195 < 2.2 < 0.8 1.4 +/- 0.9 < 1.1 7.8 +/- 0.9 < 2.8 MW-P8-2 07/07/15 < 192 MW-P8-2 11/04/15 < 193 MW-P8-20 01/06/15 < 161 MW-P8-20 04/08/15 < 192 < 4.1 < 0.5 < 4.8 < 4.1 7.6 +/- 4.0 < 3.8 MW-P8-20 07/07/15 < 189 MW-P8-20 11/05/15 < 193 MW-P8-21 01/06/15 < 164 MW-P8-21 04/08/15 < 190 < 5.8 < 0.7 < 2.2 < 0.5 17.1 +/- 1.6 < 1.5 MW-P8-21 07/07/15 < 189 MW-P8-21 11/05/15 < 192 MW-P8-22 01/06/15 617 +/- 136 MW-P8-22 04/08/15 314 +/- 136 < 4.0 < 0.5 < 1.3 < 0.6 1.7 +/- 0.8 < 1.7 MW-P8-22 04108115 333 +/- 129 < 5.2 < 0.5 < 0.8 < 0.6 2.8 +/- 0.9 < 1.6 MW-P8-22 07/07/15 761 +/- 154 B-1

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER AND SEEP SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A~Sus) Gr-B ~Dis~ Gr-B (Sus~

MW-PB-22 11/05/15 Original 984 +/- 169 MW-PB-22 11/05/15 Rerun 803 +/- 165 MW-PB-24 01/06/15 < 180 MW-PB-24 04/07/15 Original 841 +/- 159 < 4.4 < 0.5 < 1.5 < 1.2 3.5 +/- 1.1 < 2.9 MW-PB-24 04/07/15 Recount 842 +/- 155 MW-PB-24 04/07/15 Rerun 993 +/- 165 MW-PB-24 04/17/15 907 +/- 165 MW-PB-24 04/23/15 Original 1740 +/- 220

. MW-PB-24 04/23/15 Rerun 1870 +/- 234 MW-PB-24 04/27/15 1390 +/- 197 MW-PB-24 05/04/15 892 +/- 154 MW-PB-24 05/11/15 701 +/- 144 MW-PB-24 05/18/15 200 +/- 119 MW-PB-24 05/26/15 < 183 MW-PB-24 06/01/15 302 +/- 131 MW-PB-24 06/04/15 1050 +/- 162 MW-PB-24 06/08/15 1600 +/- 222 MW-PB-24 06/15/15 1420 +/- 217 MW-PB-24 06/22/15 772 +/- 164 MW-PB-24 06/29/15 333 +/- 122 MW-PB-24 07/06/15 1270 +/- 182 MW-PB-24 08/03/15 Original 2180 +/- 276 MW-PB-24 08/03/15 Recount 2090 +/- 267 MW-PB-24 09/03/15 1670 +/- 229 MW-PB-24 11/04/15 569 +/- 147 MW-PB-24 12/14/15 619 +/- 147 MW-PB-25 01/06/15 8890 +/- 928 MW-PB-25 04/07/15 Original 37700 +/- 3800 < 3.5 < 0.4 < 1.2 < 0.5 11.9 +/- 2.3 < 1.5 MW-PB-25 04/07/15 Recount 36000 +/- 3630 MW-PB-25 04/07/15 Rerun 38100 +/- 3850 MW-PB-25 04/17/15 21100 +/- 2150 MW-PB-25 04/23/15 Original 24200 +/- 2450 MW-PB-25 04/23/15 Rerun 26100 +/- 2640 MW-PB-25 04/27/15 11700 +/- 1210 MW-PB-25 05/04/15 9410 +/- 973 MW-PB-25 05/11/15 7570 +/- 796 MW-PB-25 05/18/15 7950 +/- 833 MW-PB-25 05/26/15 5960 +/- 640 MW-PB-25 06/01/15 14100 +/- 1460 MW-PB-25 06/04/15 7350 +/- 777 MW-PB-25 06/08/15 5520 +/- 602 MW-PB-25 06/15/15 5650 +/- 620 MW-PB-25 06/22/15 6540 +/- 707 MW-PB-25 06/29/15 6880 +/- 735 MW-PB-25 07/06/15 6480 +/- 689 MW-PB-25 08/03/15 6660 +/- 716 MW-PB-25 09/03/15 Original 9980 +/- 1050 MW-PB-25 09/03/15 Recount 8980 +/- 954 MW-PB-25 11/04/15 5600 +/- 607 MW-PB-25 12/14/15 Original 8680 +/- 919 MW-PB-25 . 12/14/15 Recount 7880 +/- 840 MW-PB-26 01/06/15 407 +/- 137 MW-PB-26 04/07/15 Original 1740 +/- 226 < 3.2 < 0.5 2.2 +/- 1.0 12.1 +/- 2.0 5.2 +/- 0.9 9.0 +/- 1.6 MW-PB-26 04/07/15 Recount 1700 +/- 225 MW-PB-26 04/07/15 Rerun 1710 +/- 221 MW-PB-26 04/17/15 876 +/- 164 MW-PB-26 04/23/15 596 +/- 138 MW-PB-26 04/27/15 577 +/- 151 B-2

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER AND SEEP SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A(Disl Gr-A ~Sus) Gr-8 (Dis) Gr-8 (Susl MW-P8-26 05/04/15 741 +/- 148 MW-P8-26 05/11/15 536 +/- 137 MW-P8-26 05/18/15 559 +/- 139 MW-P8-26 05/26/15 295 +/- 126 MW-P8-26 06/01/15 362 +/- 135 MW-P8-26 06/04/15 551 +/- 137 MW-PB-26 06/08/15 449 +/- 146 MW-P8-26 06/15/15 488 +/- 157 MW-P8-26 06/22/15 448 +/- 144 MW-P8-26 06/29/15 498 +/- 135 MW-PB-26 07/06/15 793 +/- 149 MW-PB-26 08/03/15 323 +/- 135 MW-PB-26 09/03/15 383 +/- 135 MW-P8-26 11/04/15 425 +/- 137 MW-PB-26 12/14/15 324 +/- 130 MW-P8-27 01/06/15 555 +/- 143 MW-PB-27 01/06/15 602 +/- 144 MW-P8-27 04/07/15 Original 2120 +/- 259 < 3.4 < 0.5 2.7 +/- 1.0 < 0.5 5.0 +/- 0.9 < 1.5 MW-PB-27 04/07/15 Recount 2210 +/- 269 MW-PB-27 04/07/15 Rerun 2180 +/- 267.

MW-PB-27 04/07/15 Original 2500 +/- 297 < 4".2 < 0.4 4.0 +/- 1.0. 1.1 +/- 0.7 5.3 +/- 1.0 < 1.5 MW-P8-27 04/07/15 Recount 2240 +/- 273 MW-PB-27 04/07/15 Rerun 2480 +/- 294 MW-P8-27 04/17/15 2330 +/- 283 MW-PB-27 04/23/15 1920 +/- 238 MW-P8-27 04/27/15 1850 +/- 243 MW-PB-27 05/04/15 2030 +/- 244 MW-P8-27 05/11/15 1850 +/- 232 MW-PB-27 05/18/15 2310 +/- 276 MW-PB-27 05/26/15 2030 +/- 257 MW-PB-27 06/01/15 1830 +/- 241 MW-PB-27 06/04/15 1500 +/- 201 MW-PB-27 06/08/15 1980 +/- 256 MW-P8-27 06/15/15 1110 +/- 185 MW-PB-27 06/22/15 1490 +/- 214 MW-P8-27 06/29/15 1600 +/- 216 MW-PB-27 07/06/15 1230 +/- 177 MW-P8-27 08/03/15 1560 +/- 217 MW-PB-27 09/03/15 1250 +/- 190 MW-P8-27 11/04/15 834 +/- 159 MW-PB-27 12/14/15 Original 1170 +/- 183 MW-P8-27 12/14/15 Recount 1020 +/- 173 MW-PB-28 01/06/15 < 162 MW-P8-28 04/07/15 < 189 < 3.9 < 0.8 < 1.0 2.9 +/- 1.1 1.9 +/- 0.7 7.8 +/- 1.6 MW-P8-28 07/07/15 Original 309 +/- 137 MW-P8-28 07/07/15 Recount 272 +/- 136 MW-PB-28 07/07/15 Rerun 422 +/- 120 MW-P8-28 08/03/15 < 194 MW-P8-28 11/04/15 < 193 MW-PB-29 01/06/15 439 +/- 123 MW-P8-29 04/08/15 290 +/- 128 < 4.6 < 0.7 < 0.7 < 0.5 2.0 +/- 0.7 < 1.5 MW-P8-29 07/07/15 TBE 292 +/- 136 MW-P8-29 07/07/15 TBE 223 +/- 131 MW-P8-29 07/07/15 EIML 169 +/- 86 MW-P8-29 11/04/15 241 +/- 131 MW-PB-3 01/06/15 < 167 MW-P8-3 04/08/15 < 189 < 2.6 < 0.8 < 1.3 < 0.8 2.8 +/- 0.8 < 1.6 MW-PB-3 07/07/15 < 191 B-3

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN GROUNDWATER AND SEEP SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A~Dis) Gr-A (Sus) Gr-8 (Dis) Gr-8 (Sus)

MW-P8-3 11/04/15 T8E < 191 MW-P8-3 11/04/15 T8E < 189 MW-P8-3 11/04/15 EIML 166 +/- 83 MW-P8-30 01/06/15 < 163 MW-P8-30 04/08/15 < 184 < 5.3 < 0.6 < 0.5 2.0 +/- 0.9 2.6 +/- 0.7 2.9 +/- 1.2 MW-P8-30 07/07/15 Original 826 +/- 166 MW-P8-30 07/07/15 Recount 790 +/- 163 MW-P8-30 07/07/15 Rerun 940 +/- 147 MW-P8-30 11/04/15 T8E Original 602 +/- 148 MW-P8-30 11/04/15 T8E Rerun 718 +/- 161 MW-P8-30 11/04/15 T8E Original 841 +/- 158 MW-P8-30 11/04/15 T8E Rerun 722 +/- 160 MW-P8-30 11/04/15 EIML 511 +/- 99 MW-P8-31 01/06/15 174 +/- 108 MW-P8-31 07/07/15 < 193 MW-P8-31 12/04/15 < 190 MW-P8-4 01/06/15 317 +/- 132 MW-P8-4 04/08/15 200 +/- 124 < 3.0 < 0.8 < 5.4 < 1.1 11.0 +/- 1.8 < 2.8 MW-P8-4 04/23/15 368 +/- 135 MW-P8-4 04/27/15 356 +/- 136 MW-P8-4 05/04/15 359 +/- 125 .

MW-P8-4 05/11/15 < 168 MW-P8-4 05/18/15 183 +/- 117 MW-P8-4 05/26/15 < 175 MW-PB-4 06/01/15 213 +/- 128 MW-PB-4 06/04/15 357 +/- 128 MW-PB-4 06/08/15 242 +/- 132 MW-PB-4 06/15/15 363 +/- 125 MW-PB-4 06/22/15 208 +/- 134 MW-P8-4 06/29/15 Recount 1 196 +/- 117 MW-P8-4 06/29/15 Recount2 212 +/- 128 MW-PB-4 07/06/15 313 +/- 123 MW-PB-4 08/03/15 275 +/- 133 MW-PB-4. 09/03/15 197 +/- 126 MW-PB-4 11/05/15 205 +/- 125 MW-PB-5 06/08/15 < 190 MW-PB-6 04/10/15 < 191 MW-PB-7 01/07/15 < 154 MW-PB-7 04/10/15 < 186 < 2.8 < 0.7 < 3.5 < 0.8 8.3 +/- 1.5 < 1.6 MW-PB-7 11/05/15 < 189 MW-PB-8 01/07/15 < 165 MW-PB-8 04/06/15 < 189 < 2.9 < 0.8 < 5.1 < 0.8 17.0 +/- 3.3 2.5 +/- 1.2 MW-PB-8 07/06/15 < 191 MW-PB-8 11/05/15 < 188 SP-P8-1 03/24/15 < 192 SP-P8-1 06/10/15 < 200 SP-P8-2 01/06/15 < 166 U/2 YARD DRAIN 04/23/15 < 193 < 4.4 < 0.5 < 1.0 < 0.4 1.8 +/- 0.9 < 1.5 U/2 YARD DRAIN 07/30/15 Original 206 +/- 129 U/2 YARD DRAIN 07/30/15 Recount 267 +/- 133 U/3 YARD DRAIN 03/13/15 < 188 U/3 YARD DRAIN 06/10/15 < 183 U/3 YARD DRAIN 07/30/15 < 194 U-3 YARD DRAIN 11/04/15 < 184 B-4

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER AND SEEP WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 DATE MW-PB-1 04/10/15 <6 <6 < 13 <7 < 12 < 8 < 11 < 10 <6 <7 <~ < 11 MW-PB-10 04/06/15 < 3 <4 <7 < 3 < 8 <4 <6 <8 <4 <4 <~ < 6 MW-PB-10 11/04/15 <7 <7 < 13 <6 < 16 <7 < 11 < 14 <5 <6 <~ < 5 MW-PB-11 04/08/15 <4 <4 < 7 <3 <7 <5 <7 <8 <4 < 5 <~ <7 MW-PB-12 04/06/15 <6 < 6 < 15 < 6 < 14 <8 < 10 < 13 <6 <8 <~ < 10 MW-PB-13 04/07/15 <7 <6 < 13 <7 < 13 <8 < 12 < 12 <7 <6 <W < 12 MW-PB-14 04/06/15 <6 <6 < 11 <5 < 12 <7 < 8 < 12 <5 < 6 <~ < 9 MW-PB-15 01/07/15 < 8 <8 < 15 <8 < 14 < 10 < 13 < 13 < 8 < 9 <~ < 11 MW-PB-15 04/06/15 <5 <5 < 10 <4 < 10 <6 <9 < 10 <5 < 5 <~ < 7 MW-PB-15 07/08/15 < 5 <6 < 10 < 5 <8 <5 <9 < 11 <5 <5 <~ < 10 MW-PB-15 11/05/15 <5 < 5 < 10 <4 < 12 <6 <9 < 11 <6 <5 <~ <9 MW"PB-16 01/07/15 < 3 <3 < 5 < 3 <7 <4 <6 <5 < 3 < 3 < 16 <4 MW-PB-16 04/06/15 <7 <7 < 13 <8 < 14 <9 < 12 < 15 < 8 <7 <~ < 11 to <7 <7 < 17 <7 < 16 <8 < 13 < 15 < 8 < 8 <~ < 13 I MW-PB-16 07/08/15 Vl MW-PB-16 11/05/15 <6 < 6 < 12 <6 < 12 < 8 < 10 < 13 < 6 <6 <~ < 10 MW-PB-19 04/07/15 <5 <5 < 13 <5 < 12 <7 < 9 < 11 < 6 < 6 <W <6 MW-PB-2 04/07/15 < 5 <4 <7 <5 <7 <5 <7 <9 <4 < 5 <~ <7 MW-PB-20 04/08/15 < 5 <5 < 12 <5 < 9 <6 <8 < 8 < 5 <6 <~ < 10 MW-PB-21 04/08/15 < 5 <4 <8 <4 <7 <4 < 8 <7 <4 <5 < 18 < 5 MW-PB-22 04/08/15 < 5 <5 < 12 < 5 < 11 < 5 <8 < 8 <5 <5 <~ < 9 MW-PB-22 04/08/15 <7 <9 < 16 <9 < 16 <7 < 12 < 13 <8 < 6 <~ < 12 MW-PB-24 04/07/15 <5 <4 < 10 < 5 < 11 <6 <9 <9 <5 < 5 <~ < 9 MW-PB-24 11/04/15 <5 <5 < 11 < 5 < 11 <7 <8 < 11 <5 < 5 <~ < 10 MW-PB-25 04/07/15 <4 <4 <7 <4 <8 <5 < 9 <9 <4 < 5 <~ <7 MW-PB-25 11/04/15 <5 <4 < 10 < 5 < 11 <6 < 10 < 14 < 5 < 5 <~ < 9 MW-PB-26 04/07/15 <5 <7 < 13 <6 < 14 <7 < 9 < 11 < 5 < 6 <~ < 10 MW-PB-26 11/04/15 <6 <6 < 17 <6 < 12 <6 < 11 < 13 < 6 < 6 <~ < 10 MW-PB-27 04/07/15 <6 <6 < 12 <6 < 12 <7 < 11 < 14 < 6 < 5 <~ < 13 MW-PB-27 04/07/15 <6 < 6 < 13 <5 < 10 <7 < 11 < 12 <5 < 6 <W < 9 MW-PB-27 11/04/15 '< 5 < 5 < 10 < 5 <9 <6 < 11 < 15 <6 < 7 <~ < 10 MW-PB-28 04/07/15 -< 6 < 6 < 12 <6 < 11 < 8 < 10 < 12 <5 <6 <W < 11 MW-PB-29 04/08/15 <6 <5 < 12 <7 <8 <6 <9 < 9 <6 < 5 <~ < 8 MW-PB-3 04/08/15 <4 <4 <9 < 5 < 9 <5 < 8 <9 <4 <4 <~ <7 MW-PB-30 04/08/15 <6 <6 < 10 <6 < 10 <6 < 8 < 11 <5 < 6 <~ <9 MW-PB-4 04/08/15 <4 <4 < 10 <4 <7 < 5 < 8 <8 <4 <4 < 21 < 5 MW-PB-5 06/08/15 < 10 <8 < 15 <7 < 15 < 10 < 15 < 12 <8 < 8 <~ < 12 MW-PB-6 04/10/15 <6 <5 < 11 <5 < 12 <5 < 10 < 8 <5 < 6 <~ <6 MW-PB-7 04/10/15 <4 <4 <8 <4 <9 <4 < 7 <7 <4 <5 <~ <5 MW-PB-8 01/07/15 <7 <5 < 14 <8 < 11 < 8 < 12 < 12 <7 < 9 <~ < 11 MW-PB-8 04/06/15 <4 <4 <9 <4 < 10 <5 < 7 <9 <4 <4 <~ <7

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER AND SEEP WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 DATE MW-PB-8 07/06/15 <4 <4 < 9 <4 < 12 <5 <7 < 12 <4 <5 < 31 <8 MW-PB-8 11/05/15 < 5 < 5 < 11 <4 < 8 <5 <7 < 10 <4 <5 < 24 <8 U2 YARD DRAIN 04/23/15 <2 <2 <5 <2 < 5 <3 < 5 < 13 <2 <2 < 22 <5 U3 YARD DRAIN 06/10/15 <5 <5 < 14 <6 < 12 <6 < 10 < 11 <5 <6 < 26 <9

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA SITE COLLECTION Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-234 U-235 U-238 Fe-55 Ni-63 DATE MW-PB-10 04/06/15 < 0.11 < 0.06 < 0.06 < 0.15 < 0.12 0.24 +/- 0.12 < 0.06 < 0.03 MW-PB-11 04/08/15 < 0.03 < 0.03 < 0.05 < 0.07 < 0.15 0.15 +/- 0.10 < 0.06 < 0.11 MW-PB-12 04/06/15 < 0.09 < 0.06 < 0.02 < 0.10 < 0.17 < 0.03 < 0.04 < 0.05 MW-PB-13 04/07/15 < 0.07 < 0.02 < 0.08 < 0.05 < 0.14 10.1 +/- 1.73 0.19 +/- 0.11 8.85 +/- 1.53 MW-PB-15 04/06/15 < 0.07 < 0.04 < 0.14 < 0.07 < 0.09 < 0.10 < 0.06 < 0.07 MW-PB-16 04/06/15 < 0.11 < 0.11 < 0.11 < 0.15 < 0.14 < 0.10 < 0.03 < 0.16 MW-PB-19 04/07/15 < 0.06 < 0.02 < 0.02 < 0.16 < 0.05 0.31 +/- 0.14 < 0.04 0.20 +/- 0.12 MW-PB-2 04/07/15 < 0.11 < 0.07 < 0.02 < 0.06 < 0.11 3.31 +/- 0.45 < 0.06 2.10 +/- 0.34 MW-PB-20 04/08/15 < 0.11 < 0.07 < 0.02 < 0.16 < 0.10 < 0.12 < 0.20 < 0.19 MW-PB-21 04/08/15 < 0.05 < 0.03 < 0.04 < 0.03 < 0.11 < 0.12 < 0.10 < 0.14 MW-PB-22 04/08/15 < 0.15 < 0.07 < 0.08 < 0.12 < 0.11 < 0.11 < 0.08 < 0.09 MW-PB-22 04/08/15 < 0.14 < 0.08 < 0.10 < 0.13 < 0.15 < 0.12 < 0.07 < 0.13 to MW-PB-24 04/07/15 < 0.10 < 0.05 < 0.07 < 0.15 < 0.06 < 0.07 < 0.04 < 0.07 < 182 < 3.2 I

-i MW-PB-25 04/07/15 < 0.08 < 0.03 < 0.16 < 0.17 < 0.13 1.17 +/- 0.28 < 0.08 0.66 +/- 0.20 < 124 < 3.3 MW-PB-26 04/07/15 < 0.08 < 0.08 < 0.08 < 0.10 < 0.08 5.05 +/- 0.66 < 0.07 2.18 +/- 0.40 < 193 < 3.1 MW-PB-27 04/07/15 < 0.14 < 0.04 < 0.07 < 0.17 < 0.15 5.20 +/- 0.68 0.24 +/- 0.13 2.04 +/- 0.38 < 185 < 3.1 MW-PB-27 04/07/15 < 0.12 < 0.02 < 0.11 < 0.09 < 0.09 5.76 +/- 0.71 < 0.07 2.16 +/- 0.38 < 199 < 3 MW-PB-28 04/07/15 < 0.10 < 0.05 < 0.06 < 0.07 < 0.13 0.54 +/- 0.20 < 0.09 0.45 +/- 0.19 MW-PB-29 04/08/15 < 0.02 < 0.13 < 0.08 < 0.11 < 0.16 < 0.10 < 0.09 < 0.12 MW-PB-3 04/08/15 < 0.02 < 0.02 < 0.09 < 0.04 < 0.13 2.70 +/- 0.41 < 0.04 1.57 +/- 0.30 MW-PB-30 04/08/15 < 0.09 < 0.18 < 0.03 < 0.11 < 0.12 < 0.09 < 0.10 < 0.11 MW-PB-31 04/08/15 < 0.13 < 0.10 < 0.12 < 0.17 < 0.12 0.30 + 0.14 < 0.06 < 0.11 MW-PB-4 04/08/15 < 0.05 < 0.02 < 0.07 < 0.17 < 0.08 < 0.06 < 0.09 < 0.11 < 185 < 3.3 MW-PB-7 04/10/15 < 0.12 < 0.15 < 0.06 < 0.20 < 0.17 < 0.08 < 0.07 < 0.09 MW-PB-7 04/10/15 < 0.19 < 0.08 < 0.10 < 0.12 < 0.08 < 0.07 < 0.05 < 0.09 MW-PB-8 04/06/15 < 0.19 < 0.02 < 0.10 < 0.04 < 0.04 < 0.13 < 0.03 < 0.13

TABLE B*ll.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SW-PB-1 01/05/15 < 157 SW-PB-1 04/08/15 < 182 SW-PB-1 04/08/15 < 185 SW-PB-1 07/06/15 < 187 SW-PB-1 07/06/15 TBE < 189 SW-PB-1 07/06/15 EIML < 155 SW-PB-1 11/03/15 < 190 SW-PB-5 01/05/15 < 162 SW-PB-5 04/08/15 < 182 SW-PB-5 07/06/15 < 191 SW-PB-5 11/03/15 < 189 SW-PB-5 11/03/15 < 190 SW-PB-5 11/03/15 < 151 SW-PB-6 01/05/15 < 165 SW-PB-6 01/05/15 < 167 SW-PB-6 04/08/15 < 185 SW-PB-6 07/06/15 < 185 SW-PB-6 11/03/15 < 194 B-8

TABLE B-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 DATE SW-PB-1 04/08/15 <6 <6 < 13 <6 < 12 <7 < 11 <9 <6 <6 < 28 <7 SW-PB-1 04/08/15 <6 <7 < 11 <7 < 12 <6 <7 < 13 <6 <5 < 28 <9 SW-PB-5 04/08/15 <6 <7 < 12 <5 < 12 <7 < 13 < 13 <6 <7 < 36 < 10 SW-PB-6 04/08/15 <5 <7 < 12 <6 < 12 <6 < 10 < 12 <6 <7 < 28 <8

TABLE B-111.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 1A 12/31/14 < 172 1A 01/28/15 < 184 1A 02/25/15 < 186 1A 03/25/15 < 193 1A 04/30/15 < 181 1A 05/28/15 < 192 1A 07/02/15 < 184 1A 07/30/15 < 190 1A . 08/27/15 < 188 1A 10/01/15 < 194 1A 10/29/15 < 195 1A 11/25/15 < 195 18 12/31/14 < 172 18 01/28/15 < 181 18 02/25/15 < 183 18 03/25/15 < 194 18 04/30/15 < 190 18 05/28/15 < 177 18 07/02/15 < 188 18 07/30/15 < 186 18 08/27/15 < 189 18 10/01/15 < 195 18 10/29/15 < 193 18 11/25/15 < 198 18 12/31/14 < 168 18 01/28/15 < 181 18 02/25/15 < 176 1S 03/25/15 < 195 1S 04/30/15 < 182 1S 05/28/15 < 178 18 07/02/15 < 186 1S 07/30/15 < 173 1S 08/27/15 < 185 1S 10/01/15 < 193 1S 10/29i15 < 197 1S 11/25/15 < 195 1SSE 12/31/14 < 168 1SSE 01/28/15 < 183 1SSE 02/25/15 < 180 1SSE 03/25/15 < 176 1SSE 04/30/15 < 182 1SSE 05/28/15 < 180 1SSE 07/02/15 < 187 1SSE 07/30/15 . < 171 1SSE 08/27/15 < 186 1SSE 10/01/15 < 193 1SSE 10/29/15 < 196 1SSE 11/25/15 < 193 1Z 12/31/14 < 171 1Z 01/28/15 < 183 1Z 02/25/15 < 187 1Z 03/25/15 < 192 1Z 04/30/15 < 181 1Z 05/28/15 < 179 1Z 07/02/15 < 186 1Z 07/30/15 < 191 1Z 08/27/15 < 187 1Z 10/01/15 < 194 B-10

TABLE B-111.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION .

PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2015 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 1Z 10/29/15 < 194 1Z 11/25/15 < 194 4M 12/31/14 < 170 4M 01/28/15 < 180 4M 02/25/15 < 188 4M 03/25/15 < 191 4M 04/30/15 < 178 4M 05/28/15 < 182 4M 07/02/15 < 188 4M 07/30/15 < 187 4M 08/27/15 < 189 4M 10/01/15 < 191 4M 10/29/15 < 192 4M 11/25/15 < 193 B-11

Docket No: 50-277 50-278 PEACH BOTTOM ATOMIC POWER STATION UNITS 2 and 3 Annual Radiological Groundwater Protection Program Report 1 January 2015 Through 31 December 2015 Prepared By Teledyne Brown Engineering Environmental Services

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