ML15132A527

2014 Annual Radiological Environmental Operating Report

ML15132A527
Person / Time
Site:	Millstone
Issue date:	04/26/2015
From:	Blakeney D Dominion Nuclear Connecticut
To:	Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
15-193
Download: ML15132A527 (95)

Text

Dominion Nuclear Connecticut, Inc.

Rope Ferry Rd., Waterford, CT 06385 OrDomi nionl Mailing Address: P.O. Box 128 Waterford, CT 06385 APR 2 6 2015 donicOnl U.S. Nuclear Regulatory Commission Serial No.15-193 Attention: Document Control Desk MPS Lic/GJC RO Washington, DC 20555-0001 Docket Nos. 50-245 50-336 50-423 License Nos. DPR-21 DPR-65 NPF-49 DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNITS 1. 2. AND 3 2014 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT This letter transmits the Annual Radiological Environmental Operating Report for the Millstone Power Station, for the period January 2014 through December 2014. This satisfies the provisions of Section 5.7.2 of Millstone Power Station Unit 1 Permanently Defueled Technical Specifications (PDTS), and Sections 6.9.1.6a and 6.9.1.3 of the Millstone Power Station Units 2 and 3 Technical Specifications, respectively.

If you have any questions or require additional information, please contact Mr.

Mr. Thomas G. Cleary at (860) 447 1791 extension 3232.

Sincerely, D. B. Blakeney Director, Nuclear Station Safety and Licensing

. MS SO

Serial No.15-193 2014 Annual Radiological Environmental Operating Report Page 2 of 4 Attachments: 1 Commitments made in this letter:

1. None.

cc: U. S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 S. J. Giebel NRC Project Manager Millstone Unit 1 U.S. Nuclear Regulatory Commission Two White Flint North, Mail Stop T-8 F5 11545 Rockville Pike Rockville, MD 20852-2738 L. A. Kauffman NRC Inspector U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 H. W Anagnostopoulos NRC Inspector U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 R. V. Guzman NRC Project Manager Millstone Units 2 and 3 U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 C2 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station

Serial No.15-193 2014 Annual Radiological Environmental Operating Report Page 3 of 4 (2copies)

Director Bureau of Air Management Monitoring & Radiation Division Department of Energy and Environmental Protection 79 Elm Street Hartford, CT 06106-5127 A. Honnellio Regional Radiation Representative (EPA Region 1, Boston)

U. S. Environmental Protection Agency (Region 1) 5 Post Office Square Suite 100 Boston, MA 02109 G. Allen Jr.

Department of Health and Human Services U. S. Food and Drug Administration 90 Madison St. Room 402 Worcester, MA 01608 R. Stein Chairman Connecticut Siting Council 10 Franklin Square New Britain, CT 06051 J. P. Kelley Waterford-East Lyme Shellfish Commission Waterford Town Hall Waterford, CT 06385 S. Brietmaier American Nuclear Insurers 95 Glastonbury Blvd.

Glastonbury, CT 06033 D. Carey Connecticut Department of Agriculture Aquaculture Division P. O. Box 97 Millford, CT 06460

Serial No.15-193 2014 Annual Radiological Environmental Operating Report Page 4 of 4 D. Steward First Selectman Town of Waterford Waterford Town Hall Waterford, CT 06385 M. C. Nickerson First Selectman Town of East Lyme PO Box 519 Niantic, CT 06357 University Of Connecticut Library Serials Department Storrs, CT 06268 Mrs. John Mingo 69 Spithead Road Waterford, CT 06385

Serial No.15-193 Docket Nos. 50-245 50-336 50-423 License Nos. DPR-21 DPR-65 NPF-49 ATTACHMENT 1 2014 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION UNITS 1, 2, AND 3 DOMINION NUCLEAR CONNECTICUT, INC. (DNC)

Millstone Power Station 2014 Radiological Environmental Operating Report January 1, 2014 - December 31, 2014 Dominion Nuclear Connecticut, Inc.

Unit License Docket 1 DPR-21 50-245 2 DPR-65 50-336 3 NPF-49 50-423

ýODomionion'

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM 2014 Millstone Power Station Unit 1, DOCKET NO. 50-245 Millstone Power Station Unit 2, DOCKET NO. 50-336 Millstone Power Station Unit 3, DOCKET NO. 50-423 Dominion Nuclear Connecticut, Inc.

Waterford, Connecticut

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014

- TABLE OFCONTENTS EXECUTIVE

SUMMARY

................................................................................................ i

1. INTRODUCTION ....................................................................................... 1-1 1.1 Overview ........................................................................................... 1-1 1.2 Radiation and Radioactivity .............................................................. 1-1 1.3 Sources of Radiation ........................................................................ 1-2 1.4 Nuclear Reactor Operations ............................................................. 1-3 1.5 Radioactive Effluent Control ............................................................. 1-8 1.6 Radiological Im pact on Hum ans ..................................................... 1-10

2. PROGRAM DESCRIPTION ........................................................................... 2.1 2.1 Sam pling Schedule And Locations ................................................... 2.1 2.2 Sam ples Collected During Report Period ......................................... 2-5 2.3 Required Samples Not Collected During the Report Period .......... 2-6

3. RADIOCHEMICAL RESULTS ........................................................................ 3-1 3.1 Sum m ary Table ................................................................................ 3-1 3.2 Data Tables ...................................................................................... 3-7

4. DISCUSSION OF RESULTS ......................................................................... 4-1 4.1 Gam m a Exposure Rate (Table 1) .................................................... 4-1 4.2 Air Particulate Gross Beta Radioactivity (Table 2) ........................... 4-4 4.3 Air Iodine (Table 3) ............................................................... 4-5 4.4 Air Particulate Gam m a (Table 4) ..................................................... 4-5 4.5 Air Particulate Strontium (Table 5) ................................................... 4-5 4.6 Soil (Table 6) ................................................................................... 4-5 4.7 Cow Milk (Table 7) ........................................................................... 4-6 4.8 Goat Milk (Table 8) .......................................................................... 4-6 4.9 Pasture Grass/Hay/Feed (Table 9) .................................................. 4-6 4.10 W ell W ater (Table 10) ...................................................................... 4-6 4.11 Reservoir W ater (Table 11) .............................................................. 4-6 4.12 Fruits and Vegetables (Table 12) .................................................... 4-7 4.13 Broad Leaf Vegetation (Table 13) .................................................... 4-7 4.14 Seawater (Table 14) ........................................................................ 4-7 4.15 Bottom Sedim ent (Table 15) ............................................................ 4-8 4.16 Aquatic Flora (Table 16) .................................................................. 4-8 4.17 Fish (Tables 17A and 17B) .............................................................. 4-8 4.18 Mussels (Table 18) .......................................................................... 4-8 4.19 Oysters (Table 19) ........................................................................... 4-9 4.20 Clam s (Table 20) ........................................................................... 4-11 4.21 Scallops (Table 21) ........................................................................ 4-11 4.22 Lobsters (Table 22) ....................................................................... 4-11

5. REFERENCES ............................................................................ 5-1 APPENDIX A - LAND USE CENSUS FOR 2014 ............................................ A-1 APPENDIX B -

SUMMARY

OF INTERLABORATORY COMPARISONS ............... B-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 I Af I

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 EXECUTIVE

SUMMARY

INTRODUCTION This report summarizes the results of the Radiological Environmental Monitoring Program (REMP) conducted in the vicinity of the Millstone Nuclear Power Station (Millstone) during the period from January 1 to December 31, 2014. This document has been prepared in accordance with the requirements of the separate Technical Specifications for Millstone Units 1, 2 and 3.

The REMP has been established to monitor the radiation and radioactivity released to the environment as a result of Millstone's operation. This program, initiated in April 1967, includes the collection, analysis, and evaluation of radiological data in order to assess the impact of Millstone on the environment and on the general public.

SAMPLING AND ANALYSIS The environmental sampling media collected in the vicinity of Millstone and at distant locations included terrestrial samples in the form of air particulate filters, charcoal cartridges, soil, cow milk, pasture grass, feed, hay, well water, broadleaf vegetation, fruits and vegetables; and aquatic samples in the form of seawater, bottom sediment, aquatic flora, fish, oysters, clams and lobster.

During 2014, there were 799 samples collected from the atmospheric, aquatic, and terrestrial environments. In addition, 176 exposure measurements were obtained using environmental thermoluminescent dosimeters (TLDs). A discussion of all discrepancies from the sample collection requirements in the Millstone Radiological Effluent Monitoring and Offsite Dose Calculation Manual (REMODCM) is given in Section 2.3 of this report.

Teledyne Brown Engineering, Inc. of Knoxville, Tennessee performed the sample analyses and Environmental Dosimetry Company of Sterling, Massachusetts performed the TLD analyses.

LAND USE CENSUS The annual land use census in the vicinity of Millstone was conducted as required by the Millstone REMODCM. Typically the cow milk locations are identified by a review of the annual registration information obtained from the State of Connecticut Department of Agriculture. Gardens are located by a drive-by during the harvest season. Although broadleaf sampling was performed and may be used in lieu of a garden census, gardens were included in the 2014 census. Only vegetable gardens having an area of more than 500 square feet need to be identified. Due to the difficulty of measuring individual gardens, the nearest garden within each directional sector identified by a drive-by survey is listed.

However, for dose calculation, garden distances are based on nearest resident assuming that a resident may plant a new garden. This gives a more conservative dose result. Goat locations are more difficult to determine, but best efforts are made by reviewing membership list of the American Dairy Goat Association records, contacting previous owners and, if necessary, performing visual drive-by inspections.

RADIOLOGICAL IMPACT TO THE ENVIRONMENT The radioactivity detected in some samples was from non-station related sources, such as fallout from past nuclear weapons tests and naturally occurring radionuclides.

All terrestrial samples collected as part of the Millstone REMP did not show any station related activity.

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Monitoring of seawater in the area of the discharge indicated the presence of tritium, a station related radionuclide. Tritium was only found in seawater onsite inside the mixing zone of the quarry discharge at levels that were expected from routine station operation.

Offsite ambient radiation measurements using environmental TLDs beyond the site boundary ranged between 39 and 102 milliRoentgens per year. The range of ambient radiation levels observed with the TLDs is consistent with natural background radiation levels for Connecticut.

RADIOLOGICAL IMPACT TO THE GENERAL PUBLIC During 2014, radiation doses to the general public as a result of Millstone's operation continued to be well below the federal limits and much less than the dose due to other sources of man-made (e.g., X-rays, medical) and naturally-occurring (e.g., cosmic, radon) radiation.

The calculated total body dose to the maximally exposed member of the general public from radioactive effluents and ambient radiation resulting from Millstone operations for 2014 was approximately 0.24 mrem* for the year. This conservative estimate is well below the Environmental Protection Agency's (EPA) annual dose limit to any member of the general public and is a fraction of a percent of the typical dose received from natural and other sources of man-made radiation.

CONCLUSIONS The 2014 REMP for Millstone resulted in the collection and analysis of 975 environmental samples and measurements. The data obtained were used to determine the impact of Millstone's operation on the environment and on the general public.

An evaluation of direct radiation measurements, environmental sample analyses, and dose calculations indicates all applicable federal criteria were met. Furthermore, radiation levels and resulting doses from station operation were a small fraction of those attributed to natural and man-made background radiation.

Based on this information, there is no significant radiological impact on the environment or on the general public due to Millstone's operation.

• The term 'mrem' used in this report is a unit of radiation dose. The letter 'm' is for 'milli', or one-thousandth of a 'rem.' The word 'rem' is an acronym for roentgen equivalent man.

One rem is equal to a rad multiplied by factors to account for type of radiation and distribution within the body. The word 'rad' is an acronym for radiation absorbed dose.

One rad is equal to the absorption of 100 ergs of energy per gram of tissue.

ii

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014

1. INTRODUCTION This section provides an overview of the Millstone REMP. It also includes background information to allow a reader to have an informed understanding of radiation and nuclear power operation.

1.1 Overview The REMP for 2014 performed by Dominion Nuclear Connecticut (DNC) for Millstone is discussed in this report. Since the operation of a nuclear power station results in the release of sn all amounts of radioactivity and low levels of radiation, the Nuclear Regulatory Commission (NRC) requires by regulations and technical specifications that a program be established to monitor radiation and radioactivity in the environment (References 1, 6, 9, 10

& 11). This report, published annually per Millstone's Technical Specifications (section 5.7.2 for Millstone Unit 1, section 6.9.1.6A for Millstone Unit 2 and Section 6.9.1.3 for Millstone Unit 3), summarizes the results of measurements of radiation and radioactivity in the environment in the vicinity of the Millstone and at distant locations during the period January 1 to December 31, 2014.

The REMP consists of taking radiation measurements and collecting samples from the environment, analyzing them for radioactivity content, and interpreting the results. With emphasis on the critical radiation exposure pathways to humans, samples from the aquatic, atmospheric, and terrestrial environments are collected. These samples include, but are not limited to: air, soil, cow milk, pasture grass, hay, well water, broadleaf vegetation, fruits, vegetables, seawater, bottom sediment, aquatic flora, fish, mussels, oysters, clams and lobster. Thermoluminescent dosimeters (TLDs) are placed in the environment to measure gamma radiation levels. The TLDs are processed and the environmental samples are analyzed to measure the very low levels of radiation and radioactivity present in the environment as a result of Millstone operation and other natural and man-made sources.

These results are reviewed by Millstone's radiological staff and have been reported semiannually or annually to the NRC and others for over 30 years.

In order to more fully understand how a nuclear power station impacts humans and the environment, background information on radiation and radioactivity, natural and man-made sources of radiation, reactor operations, radioactive effluent controls, and radiological impact on humans is provided. It is believed that this information will assist the reader in understanding the radiological impact on the environment and humans from the operation of Millstone.

1.2 Radiation and Radioactivity All matter is made of atoms. Nuclear radiation is energy or particles that are given off from atoms in an excited state (e.g., unstable, radioactive atoms).

Radioactive material exists naturally and has always been a part of our environment. The earth's crust, for example, contains radioactive uranium, radium, thorium, and potassium.

Some radioactivity is a result of fallout from nuclear weapons testing. Examples of radioactive fallout that could be present in environmental samples are cesium-137 and strontium-90. Some examples of radioactive materials released from a nuclear power station are hydrogen-3 (tritium), cesium-1 37, iodine-1 31, strontium-90, and cobalt-60.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Radiation is measured in units of mrem, much like temperature is measured in degrees. A mrem (mrem) is a measure of the biological effect of the energy deposited in tissue. The letter 'm' is for 'milli', or one-thousandth of a 'rem.' The word 'rem' is an acronym for roentgen equivalent man. One rem is equal to a 'rad' multiplied by factors to account for type of radiation and distribution within the body. The word 'rad' is an acronym for radiation absorbed dose. One rad is equal to the absorption of 100 ergs of energy per gram of tissue.

The natural and man-made radiation dose received in one year by the average American is 300 to 600 mrem (References 2, 3, 4 & 5). The per capita dose has increased since the mid 1980's because of the increased usage of medical procedures involving exposure to 3).

radiation (see Reference Radioactivity is measured in Curies. Levels of radioactivity commonly seen in the environment are typically a small fraction of a Curie, therefore radioactivity in the environment is typically measured in picocuries. One picocurie (pCi) is one-trillionth of a Curie and is equal to 0.037 disintegrations per second (2.22 disintegrations per minute).

1.3 Sources of Radiation As mentioned previously, naturally occurring radioactivity has always been a part of our environment. Table 1.3 shows the sources and doses of radiation from natural and man-made sources.

Table 1.3 Radiation Sources and Corresponding Doses (1)

NATURAL MAN-MADE Radiation Dose Radiation Dose Source (mrem/year) Source (mrem/year)

Internal, inhalation(2) 228 Medical(3) 300 External, space 33 Consumer(4) 13 Internal, ingestion 29 Industrial, security, 0.3 educational, research External, terrestrial 21 Occupational 0.5 Weapons Fallout < 1 Nuclear Power Stations < 1 Approximate Total 311 Approximate Total 314 (1) information from References 3 and 4 (2) from radon and thoron (3) includes computerized tomography (147 mrem), nuclear medicine (77 mrem), interventional fluoroscopy (43 mrem) and conventional radiography and fluoroscopy (33 mrem)

(4) primarily from cigarette smoking (4.6 mrem), commercial air travel (3.4 mrem), building materials (3.5 mrem) and mining and agriculture (0.8 mrem) 1-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Cosmic radiation (external, space) from the sun and outer space penetrates the earth's atmosphere and continuously bombards us with rays and charged particles. Some of this cosmic radiation interacts with gases and particles in the atmosphere, making them radioactive. These radioactive byproducts from cosmic ray bombardment are referred to as cosmogenic radionuclides. Isotopes such as beryllium-7 and carbon-14 are formed in this way. Exposure to cosmic and cosmogenic sources of radioactivity results in about 30 mrem of radiation dose per year.

AddJitionally, natural radioactivity is in our body and in the food we eat (about 30 mrem/year),

the~ground we walk on (about 20 mrem/year) and the air we breathe (about 230 mrem/year).

The9 majority of a person's annual dose results from exposure to radon and thoron in the air we breathe. These gases and their radioactive decay products arise from the decay of naturally occurring uranium, thorium and radium in the soil and building products such as brick, stone, and concrete. Radon and thoron levels vary greatly with location, primarily due to changes in the concentration of uranium and thorium in the soil. Residents at some locations in Colorado, New York, Pennsylvania, New Jersey and even Connecticut have a higher annual dose as a result of higher levels of radon/thoron gases in these areas. In total, these various sources of naturally-occurring radiation and radioactivity contribute to a total dose of about 310 mrem per year.

In addition to natural radiation, we are normally exposed to radiation from a number of man-made sources. The single largest doses from man-made sources result from therapeutic and diagnostic applications of x-rays and radiopharmaceuticals. The annual dose to an individual in the United States from medical and dental exposure is approximately 300 mrem.

Consumer products/uses, such as cigarettes, building materials and commercial air travel contribute about 10 mrem/year. Much smaller doses result from weapons fallout (less than 1 mrem/year) and nuclear power stations (less than 1 mrem/year). Typically, the average person in the United States receives approximately 310 mrem per year from man-made sources.

1.4 Nuclear Reactor Operations Millstone generates about 2100 megawatts of electricity at full power, which provides approximately one-third of the power consumed in the State of Connecticut. Millstone Unit 2 and Millstone Unit 3 are pressurized water reactors (Millstone Unit 1, which is permanently shutdown, was a boiling water reactor). The nuclear station is located on an approximate 500-acre site about 5 kilometers (three miles) west of New London, Connecticut.

Commercial operation of Millstone Unit 2 began in December 1975 and Millstone Unit 3 in May 1986.

Millstone was operational during most of 2014, with the exception of refueling outages at Millstone Unit 2 in April and at Millstone Unit 3 in October. Both units went offline on May 25 because of loss of offsite power with Unit 2 down for three days and Unit 3 for eight days.

Unit 2 was offline for five days at the end of July because of a failed surveillance on the terry turbine. The annual capacity factor for Millstone Unit 2 was 85.4% and for Millstone Unit 3 was 88.1%.

Nuclear-generated electricity is produced by many of the same techniques used for conventional oil and coal-generated electricity. Both systems use heat to boil water in order to produce steam. The steam turns a turbine, which turns a generator, producing electricity.

In both cases, the steam passes through a condenser where it changes back into water and re-circulates back through the system (see Figure 1.4-1). The cooling water source for Millstone is the Niantic Bay.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 The key difference between nuclear power and conventional power is the source of heat used to boil the water. Conventional stations burn fossil fuels in a boiler, while nuclear stations use uranium fission in a nuclear reactor.

Inside the reactor, a nuclear reaction called fission takes place. Particles, called neutrons, strike the nucleus of a uranium-235 atom, causing it to split into fragments called radioactive fission products. The splitting of the atoms releases both heat and more neutrons. The newly-released neutrons then collide with and split other uranium atoms, thus making more hebt and releasing even more neutrons, and on and on until the uranium fuel is depleted or spent. This process is called a chain reaction. When this chain reaction is self sustaining, the reactor is called "critical."

The operation of a nuclear reactor results in the release of small amounts of radioactivity and low levels of radiation. The radioactivity originates from two major sources, radioactive fission products and radioactive activation products. Radioactive fission products, as illustrated in Figure 1.4-1, originate from the fissioning of the nuclear fuel. These fission products get into the reactor coolant from their release by minute amounts of uranium on the outside surfaces of the fuel cladding, by diffusion through the fuel pellets and cladding and, on occasion, through defects or failures in the fuel cladding. These fission products circulate along with the reactor coolant water and will deposit on the internal surfaces of pipes and equipment. The radioactive fission products on the pipes and equipment emit radiation.

Examples of some fission products are krypton-85 (Kr-85), strontium-90 (Sr-90), iodine-131 (1-131), xenon-133 (Xe-133), and cesium-137 (Cs-137).

SIMPLIFIED DIAGRAM OF A PRESSURIZED WATER REACTOR Pressurized water reactor-

...... (LWR)

Reactor 0J a common type of Light Water C00UNG CONIDEINSER WATE-R TAKING WASTE HEAT TO THE ENVIRONMENT Figure 1.4-1 1-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Nuclear Fission Fission is the splitting of atoms (e.g., uranium-235) by a neutron to release heat and more neutrons, creating a chain reaction. Radiation and fission products are by-products of the process.

Uranium

-," Radiation Uranium Uranium Fission Products Figure 1.4-2 Radioactive Fission Product Formation 1-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Radioactive activation products (see Figure 1.4-3), on the other hand, originate from two sources. The first is by neutron bombardment of the hydrogen, oxygen and other gas (helium, argon, nitrogen) molecules in the reactor cooling water. The second is a result of the fact that the internals of any piping system or component are subject to minute yet constant corrosion from the reactor cooling water. These minute metallic particles (for example: nickel, iron, cobalt, or magnesium) are transported through the reactor core into the fuel region, where neutrons may react with the nuclei of these particles, producing radioactive products. So, activation products are nothing more than ordinary naturally-(.ccurring atoms that are made unstable or radioactive by neutron bombardment. These dctivation products circulate along with the reactor coolant water and will deposit on the initernal surfaces of pipes and equipment. The radioactive activation products on the pipes and equipment emit radiation. Examples of some activation products are manganese-54 (Mn-54), iron-59 (Fe-59), cobalt-60 (Co-60), and zinc-65 (Zn-65).

n-- collision with Stable Radioactive Neutron Cobalt Nucleus Cobalt Nucleus Figure 1.4-3 Radioactive Activation Product Formation At Millstone there are five independent protective barriers that confine these radioactive materials. These five barriers are:

• fuel pellets;

• fuel cladding;

, reactor vessel and associated piping and equipment;

, primary containment and,

, secondary containment (enclosure building).

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 The ceramic uranium fuel pellets provide the first barrier. Most of the radioactive fission products are either physically trapped or chemically bound between the uranium atoms, where they will remain. However, a few fission products that are volatile or gaseous may diffuse through the fuel pellets into small gaps between the pellets and the fuel cladding.

The second barrier, the fuel cladding, consists of zirconium alloy tubes that confine the fuel

'pellets. The small gaps between the fuel and the cladding contain the noble gases and

?Volatile iodines that are types of radioactive fission products. This radioactivity can diffuse to a small extent through the fuel cladding into the reactor coolant water. Radioactivity can also escape into coolant water through cladding defects and failures.

The third barrier consists of the reactor pressure vessel, steel piping and equipment that confine the reactor cooling water. The reactor pressure vessel, which holds the reactor fuel, is typically a steel tank 40 feet high by 14 feet in diameter with walls about five to nine inches thick. These vessels and associated piping provide containment for radioactivity in the primary coolant and the reactor core. However, during the course of operations and maintenance, small amounts of radioactive fission and activation products can escape through valve leaks or upon breaching of the primary coolant system for maintenance.

The fourth barrier is the primary containment. It is a cylindrical enclosure with approximately five-foot thick steel reinforced concrete walls lined by steel on the inside. During operation the containment is closed but small amounts of radioactivity may be released from primary containment by venting during operation to maintain proper containment pressure. During maintenance and refueling outages containment is open and small amounts of radioactivity is released during this time when the fuel has been moved out of the reactor cavity in containment.

The fifth barrier is the secondary containment or enclosure building. The enclosure building is a steel building that surrounds the primary containment. This barrier is an additional safety feature at Millstone's reactor units to contain radioactivity that may escape from the primary containment. This enclosure building is equipped with a filtered ventilation system that is used when needed to reduce the radioactivity that escapes from the primary containment.

The five barriers confine most of the radioactive fission and activation products. However, small amounts of radioactivity do escape via mechanical failures and maintenance on valves, piping, and equipment associated with the reactor cooling water system. The small amounts of radioactive liquids and gases that do escape the various containment systems are further controlled by the liquid purification and ventilation filtration systems. The control of radioactive effluents at Millstone will be discussed in more detail in the next section.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 1.5 Radioactive Effluent Control The small amounts of radioactive liquids and gases that might escape the first two barriers are processed in the liquid and gaseous waste treatment systems, then monitored for radioactivity, and released only if the radioactivity levels are below the federal release limits.

Radioactivity released from the liquid effluent system to the environment is limited, controlled, and monitored by a variety of systems and procedures which include:

• reactor water cleanup system;

• liquid radwaste treatment system;

• sampling and analysis of the liquid radwaste tanks; and,

• liquid waste effluent discharge radioactivity monitor.

The purpose of the reactor water cleanup system is to continuously purify the reactor cooling water by removing radioactive atoms and non-radioactive impurities that may become activated by neutron bombardment. A portion of the reactor coolant water is diverted from the primary coolant system and is directed through ion exchange resins where radioactive elements, dissolved and suspended in the water, are removed through chemical processes.

The net effect is a substantial reduction of the radioactive material that is present in the primary coolant water and consequently the amount of radioactive material that might escape from the system.

Reactor cooling water that might escape the primary cooling system and other radioactive water sources are collected in floor and equipment drains., These drains direct this radioactive liquid waste to large holdup tanks. The liquid waste collected in the tanks is purified again using the liquid radwaste treatment system, which consists of a filter and ion exchange resins.

Processing of liquid radioactive waste results in large reductions of radioactive liquids discharged into Niantic Bay. Wastes processed through liquid radwaste treatment can be purified and, in some cases, re-used in station systems.

Prior to release, the radioactivity in any liquid radwaste tank is sampled and analyzed to determine if the level of radioactivity is below the release limits and to quantify the total amount of radioactive liquid effluent that will be released. If the levels are below the federal release limits, the tank is drained to the liquid effluent discharge header.

This liquid waste effluent discharge line is provided with a shielded radioactivity monitor. This detector is connected to a radiation level meter and a recorder in the Control Room. The radiation alarm is set so that the detector will alarm before radioactivity levels exceed the release limits. The liquid effluent discharge header has an isolation valve. If an alarm is received, the liquid effluent discharge valve will automatically close, thereby terminating the release to the environment and preventing any liquid radioactivity from being released that may exceed the release limits. An audible alarm notifies the Control Room operator that this has occurred.

Some liquid waste sources, which have a low potential for containing radioactivity, and/or may contain very low levels of contamination, may be discharged directly to the environment.

One such source of liquid is the turbine building sump. However, periodic representative samples are collected for analysis of radioactivity content to track the amounts of radioactivity being discharged.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 The preceding discussion illustrates that many controls exist to reduce the radioactive liquid effluents released to the environment to as far below the release limits as is reasonably achievable.

Radioactive releases from the radioactive gaseous effluent system to the environment are limited, controlled, and monitored by a variety of systems and procedures which include:

• containment building ventilation system;

• containment building radioactivity monitors;

• sampling and analysis of containment building vent and purge effluents;

• process gas treatment system;

• auxiliary building (and engineered safeguards and fuel building for Millstone Unit 3) ventilation system;

• Millstone station stack and units' vent effluent radioactivity monitors;

• sampling and analysis of Millstone station stack and units' vent effluents;

• process radiation monitors; and

• steam jet air ejector (SJAE) monitor The primary sources of gaseous radioactive waste are degassing of the primary coolant, gaseous liquid drains, and gaseous vents. Additional sources of gaseous waste activity include ventilation air released from the auxiliary building and purging and venting of the containment building. The radiation level meter and recorders for the effluent radioactivity monitors are located in the Control Room. The station process computer aids in tracking the monitor readings. To supplement the information continuously provided by the detector, air samples are taken periodically from the units' containments, Millstone station stack and units' vents. These samples are analyzed to quantify the total amount of radioactive gases, radioactive iodines, radioactive particulate and tritium released in gaseous effluents.

Gases from the primary coolant are held up in waste gas decay tanks for decay at Millstone Unit 2. Gaseous waste at Millstone Unit 3 is purified through a process gas system, consisting of high-efficiency particulate air filters and charcoal adsorber beds. Gases from periodic venting of the Millstone Unit 2 containment are released through a similar process system (Enclosure Building Filtration System) while gases from the Millstone Unit 3 containment vacuum pumps are released without treatment. If necessary, Millstone Unit 3 containment air can be filtered by an internal particulate and charcoal treatment system.

Containment purges (purge is the forced ventilation process while containment vents are pressure releases) for Millstone Unit 2 are filtered by high-efficiency particulate filters while at Millstone Unit 3 these are not normally filtered. If necessary, particulate and charcoal filters can be used for these purges.

Normally, for Unit 2, the air released from the unit vent is from the ventilation of the auxiliary (which includes the fuel pool), service and enclosure buildings. For Unit 2, fuel pool and enclosure building ventilation can be redirected to the Millstone Site Stack. Normally, for Unit 3, the air released from the unit vent is from the ventilation of the auxiliary, fuel, service, waste disposal and enclosure buildings. For Unit 3, enclosure building ventilation can be redirected to the Millstone Site Stack.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Therefore, for both liquid and gaseous releases, radioactive effluent control systems exist to collect and purify the radioactive effluents in order to reduce releases to the environment to as low as is reasonably achievable. The effluents are always monitored, sampled and analyzed to make sure that radioactivity levels are below the release limits. If the release limits are being approached, isolation valves are closed to stop the release and ensure that federal regulatory limits are always met.

1.6 Radiological Impact on Humans The final step in the effluent control process is the determination of the radiological dose impact to humans and comparison with the federal dose limits to the public. This step is performed in three stages. As mentioned previously, the purpose of continuous radiation monitoring and periodic sampling and analysis is to measure the quantities of radioactivity being released to determine compliance with the radioactivity release limits. This is the first stage for assessing releases to the environment.

The second stage is calculation of the dose impact to the general public from Millstone's radioactive effluents. The purpose of this calculation is to periodically assess the dose to the general public resulting from radioactive effluents to ensure that the dose is being maintained as far below the federal dose limit as is reasonably achievable. This is the second stage for assessing releases to the environment.

The types and quantities of radioactive liquid and gaseous effluents released from Millstone during each year are reported to the NRC annually in the Radiological Effluent Release Report (RERR). Similar to this report, the RERR is submitted annually to the NRC. The liquid and gaseous effluents were well below the federal release limits and were a small percentage of the Millstone REMODCM effluent control limits.

The measurements of the physical and chemical nature of the effluents are used to determine how the radionuclides will interact with the environment and how they can result in radiation exposure to humans. The environmental interaction mechanisms depend upon factors such as the hydrological (water) and meteorological (atmospheric) characteristics in the area. Information on the water flow, wind speed, wind direction, and atmospheric mixing characteristics are used to estimate how radioactivity will distribute and disperse in the ocean and the atmosphere.

The most important type of information that is used to evaluate the radiological impact on humans is data on the use of the environment. Information on fish and shellfish consumption, boating usage, beach usage, locations of cows and goats, locations of residences, locations of gardens, and other usage information are utilized to estimate the amount of radiation and radioactivity received by the general public.

The radiation exposure pathway to humans is the path radioactivity takes from its release point at Millstone to its effect on man. The movement of radioactivity through the environment and its transport to humans is portrayed in Figure 1.6.

1-10

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 EXAMPLES OF Millstone's RADIATION EXPOSURE PATHWAYS LIQUID ................

EFFLUENTS

3. DIRECT RADIATION

4. DIRECT RADIATION

._ (SOIL DEPOSITION)

(AIR SUBMERSION)

1. SHORELINE DIRECT RADIATION 6"l (FISHING, PICNICJNG) 5. CONSUMPTION (VEGETATION) 2' DEPOSITION

2. DIRECT RADIATION (IMMERSION IN OCEAN, BOATING, SWIMMING) 6

.CONSUMPTION DEPOSITION (MILK AND MEAT)

INGESTION 3)

(FH3.

CONSUMPTION (FISH, SHELLFISH)

INGESTION Figure 1.6 Radiation Exposure Pathways 1-11

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 There are four pathways in which liquid effluents affect humans:

• external radiation from liquid effluents that deposit and accumulate on the shoreline;

• external radiation during boating from radioactivity in ocean water;

• external radiation from immersion in ocean water containing radioactivity; and,

• internal radiation from consumption of fish and shellfish containing radioactivity absorbed from the liquid effluents.

There are five major ways in which gaseous effluents affect humans:

• external radiation from immersion in an airborne plume of radioactivity;

• internal radiation from inhalation of airborne radioactivity;

• external radiation from deposition of radioactive effluents on the ground;

• internal radiation from consumption of vegetation containing radioactivity deposited on the vegetation from airborne deposition and absorbed from the soil due to ground deposition of radioactive effluents; and,

• internal radiation from consumption of milk and meat containing radioactivity deposited on forage that is eaten by cattle and other livestock.

Ambient (direct) radiation emitted from sources of radioactivity at Millstone comes from low-level radioactive waste being processed and stored at the site prior to shipping and disposal.

Also, the operation of the Independent Spent Fuel Storage Installation (ISFSI) which began in 2005 results in a small amount of direct radiation at the site boundary.

The radiological dose impact on humans is based both on effluent analyses and modeling and on direct measurements of radiation and radioactivity in the environment. However, the operation of Millstone results in releases of only small amounts of radioactivity, and, as a result of dilution in the atmosphere and ocean, even the most sensitive radioactivity measurement and analysis techniques cannot usually detect these tiny amounts of radioactivity above that which is naturally present in the environment. Therefore, radiation doses are calculated using radioactive effluent release data and computerized dose calculations that are based on conservative NRC-recommended models that tend to result in over-estimates of the resulting dose. These computerized dose calculations are performed by DNC personnel. These computer codes use the guidelines and methodology set forth by the NRC in Regulatory Guide 1.109 (Reference 7). The dose calculations are specified in the Millstone's REMODCM (Reference 8), which has been reviewed by the NRC.

It should be emphasized that because of the conservative assumptions made in the computer code calculations, the maximum hypothetical dose to an individual is considerably higher than the dose that would actually be received by a real individual.

1-12

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 After dose calculations are performed, the results are compared to the dose limits for the public as specified in NRC's technical specifications for Millstone (References 9-11).

The technical specifications limits for the dose to a member of the general public from radioactive material in liquid effluents released to unrestricted areas are:

• less than or equal to 3 mrem per year to the total body; and,

• less than or equal to 10 mrem per yea r to any organ.

The technical specifications limits for dose due to release of radioactivity in gaseous effluents is restricted to:

• less than or equal to 10 mrad per year for gamma radiation from noble gases,

• less than or equal to 20 mrad per year for beta radiation from noble gases and

• less than or equal to 15 mrem per year to any organ from iodine-131, iodine-133, tritium, and all particulate radionuclides with half-lives greater than 8 days.

The technical specifications limits for total dose from all three Millstone units due to release of radioactivity in gaseous and liquid effluents and direct radiation is restricted to:

• less than or equal to 25 mrem per year to the total body;

• less than or equal to 75 mrem per year to the thyroid; and,

• less than or equal to 25 mrem per year to any other organ.

The third stage of assessing releases to the environment is the REMP. The description and results of the REMP at Millstone during 2014 is discussed in Sections 2 through 4 of this report.

1-13

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014

2. PROGRAM DESCRIPTION 2.1 Sampling Schedule and Locations The sample locations and the sample types and frequency of analysis are given in Tables 2-1 and 2-2. The program as described on Table 2-2 only lists the required samples as specified in the REMODCM. However, in order to identify the locations of the extra samples, all locations (both required and extra) are listed in Table 2-1.

2-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Table 2-1 Environmental Monitoring Program Sampling Types and Locations Distance, No.- Direction From Type 1 Location Name Release Point 2 Sample Media 1-1 Onsite - Old Millstone Rd. 0.6 Mi, NNW TLD, Air Particulate, Iodine, Vegetation 2-1 Onsite - Weather Shack 0.3 Mi, S TLD, Air Particulate, Iodine 3-1 Onsite.- Bird Sanctuary 0.3 Mi, NE TLD, Air Particulate, Iodine, Soil 4-1 OnsitE!- Albacore Drive 1.0 Mi, N TLD, Air Particulate, Iodine, Soil 5-1 Onsite - MP3 Discharge 0.1 Mi, SSE TLD 6-1 Onsite - Quarry Discharge 0.3 Mi, SSE TLD 7-1 Onsite - Env. Lab Dock 0.3 Mi, SE TLD 8-1 Onsite - Env. Lab 0.3 Mi, SE TLD 9-1 Onsite - Bay Point Beach 0.4 Mi, W TLD 10-1 Pleasure Beach 1.2 Mi, E TLD, Air Particulate, Iodine, Vegetation 11-1 New London Country Club 1.6 Mi, ENE TLD, Air Particulate, Iodine 12-X Fisher's Island, NY 8.0 Mi, ESE TLD 13-C Mystic, CT 11.5 Mi, ENE TLD 14-C Ledyard, CT 12.0 Mi, NE TLD, Soil 15-C Norwich, CT 14.0 Mi, N TLD, Air Particulate, Iodine 16-C Old Lyme, CT 8.8 Mi, W TLD 17-1 Site Boundary 0.5 Mi, NE Vegetation 22-X Cow 10.5 Mi, WNW Milk 21-I3 Goat Location #1 2.0 Mi, N Milk 24-C 3 Goat Location #3 29.0 Mi, NNW Milk 25-1 Within 10 Miles < 10 Miles Vegetation 25-X Within 10 Miles < 10 Miles Fruits and/or Vegetables4 26-C Beyond 10 Miles > 10 Miles Vegetation 26-X Beyond 10 Miles > 10 Miles Fruits and/or Vegetables 27-1 Niantic 1.7 Mi, WNW TLD, Air Particulate, Iodine 5

28-1 Two Tree Island 0.8 Mi, SSE Mussels , Fish6 6

29-1 West Jordan Cove 0.4 Mi, ENE-ESE Clams, Fish 29-X West Jordan Cove 0.4 Mi, NNE Fucus 5 30-1 Niantic Shoals 1.5 Mi, NNW Mussels

.31-1 Niantic Shoals 1.8 Mi, NW Bottom Sediment, Oysters 32-1 Vicinity of Discharge <0.1 Mi Bottom Sediment, Lobsters7 , Oysters, Fish 5, Seawater 32-X Vicinity of Discharge < 0.1 Mi Fucus 33-1 Seaside Point 1.8 Mi, ESE Bottom Sediment 34-1 Thames River Yacht Club 4.0 Mi, ENE Bottom Sediment 35-1 Niantic Bay <0.5 Mi, SSW-W Lobster, Fish 35-X Niantic Bay 0.3 Mi, WNW Fucus 36-X Black Point 3.0 Mi, WSW Fucus 37-C Giant's Neck 3.5 Mi, WSW Bottom Sediment, Oysters, Seawater 38-1 Waterford Shellfish Bed #1 1.0 Mi, NW Clams 39-X Jordan Cove Bar 0.8 Mi. NE Bottom Sediment 2-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 No.- Distance, Direction From Type* Location Name Release Point** Sample Media 41-1 Myrock Avenue 3.2 Mi, ENE TLD 42-1 Billow Road 2.4 Mi, WSW TLD 43-1 Black Point 2.6 Mi, SW TLD 44-1 Onsite - Schoolhouse 0.1 Mi, NNE TLD 45-1 Onsite - Access Road 0.5 Mi, NNW TLD 46-1 Old Lyme - Hillcrest Ave. 4.6 Mi, WSW TLD 47-1 East Lyrne - W. Main St. 4.5 Mi, W TLD 48-1 East Lyme - Corey Rd. 3.4 Mi, WNW TLD 49-1 East Lyme - Society Rd. 3.6 Mi, NW TLD 50-1 East Lyme - Manwaring Rd. 2.1 Mi, W TLD 51-1 East Lyme - Smith Ave. 1.5 Mi, NW TLD 52-1 Waterford - River Rd. 1.1 Mi, NNW TLD 53-1 Waterford - Gardiners Wood Rd 1.4 Mi, NNE TLD 55-1 Waterford - Magonk Point 1.8 Mi, ESE TLD 56-1 New London - Mott Ave. 3.7 Mi, E TLD 57-1 New London - Ocean Ave. 3.6 Mi, ENE TLD 59-1 Waterford -Miner Ave. 3.4 Mi, NNE TLD 60-1 Waterford - Parkway South 4.0 Mi, N TLD 61-1 Waterford - Boston Post Rd. 4.3 Mi, NNW TLD 62-1 East Lyme - Columbus Ave. 1.9 Mi, WNW TLD 63-1 Waterford - Jordon Cove Rd. 0.8 Mi, NE TLD 64-1 Waterford - Shore Rd. 1.1 Mi, ENE TLD 65-1 Waterford - Bank St. 3.2 Mi, NE TLD 66-X NAP Parking Lot - Fit Center 0.4 Mi, NW TLD 67-X Golden Spur 4.7 Mi, NNW Bottom Sediment 71-1 1-MW-XFMR-03 Onsite Well Water 72-1 MW-GPI-1 Onsite Well Water 73-X Site Switchyard Fence 0.3 Mi, N TLD 74-X Ball Field Foul Pole 0.6 Mi, N TLD 75-X Waterford - Windward Way & Shotgun 0.5 Mi, NE TLD 76-X ISFSI-1 Up-gradient of ISFSI Well Water 77-X ISFSI-2 Down-gradient of ISFSI Well Water 78-X ISFSI-3 Down-gradient of ISFSI Well Water 79-1 M3-MW-1 Onsite Well Water 81-1 S2-MW-1 Onsite Well Water 82-1 MW-6B Onsite Well Water 83-1 S3-MW-2 Onsite Well Water 88-1 DEEP Dock 0.2 Mi, WNW Oysters 7

89-C Aquatic background >0.4 Mi of discharge Lobster 90-X Thames River 4 Mi, E Fucus Footnotes:

1. Key: I - Indicator C - Control X - Extra - sample not required by the REMODCM

2. Release points are the Millstone station stack for terrestrial locations and the quarry cut for aquatic locations.

3. Goat milk sampling was discontinued on July 1 due to lack of availability.

4. A fruit or vegetable sample may count as a required vegetation sample.

5. Beginning on July 1, mussels were not required.

6. Flounder and another type of fish, each required to be sampled at two separate locations. Beginning on July 1, flounder was not required.

7. Beginning on July 1, lobster was not required at vicinity of discharge but was required beyond 0.4 mile of discharge.

2-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Table 2-2 Required Sampling Frequency & Type of Analysis Exposure Pathway No. of Sampling & Collection Frequency Type of Analysis and/or Sample Locations

1. Gamma Dose - 391 Quarterly Gamma Dose - Quarterly Environmental TLD

2. Airborne Particulate 8 Continuous sampler - weekly filter Gross Beta - Weekly change (Jan 1-June 30) and bi- Gamma Spectrum - Quarterly on weekly (July 1-Dec 31) composite (by location), and on individual sample if gross beta is greater than 10 times the mean of the weekly control station's gross beta results

3. Airborne Iodine 8 Continuous sampler - weekly canister 1-131 - Weekly change

4. Vegetation 3 One sample near middle and one Gamma Isotopic on each sample near end of growing season

5. Fruit and vegetables 2 One sample near middle and one Gamma Isotopic on each sample near end of growing season

6. Milk 2 2 Semimonthly when animals are on Gamma Isotopic and 1-131 on pasture; monthly at other times. each sample; Sr-89 and Sr-90 on quarterly composite 6a. Pasture Grass 3 2 Sample as necessary to substitute Gamma Isotopic and 1-131 on for unavailable milk each sample

7. Sea Water 2 Continuous sampler with a monthly Gamma Isotopic and Tritium on collection at indicator location, each sample.

Quarterly at control location -

Composite of 6 weekly grab samples.

8. Well Water 6 Semiannual Gamma Isotopic and Tritium on each sample

9. Bottom Sediment 5 Semiannual Gamma Isotopic on each sample

10. Soil 3 Annually Gamma Isotopic on each sample 4

11. Fin Fish - Flounder 2 Quarterly Gamma Isotopic on each sample and one other type of edible fin fish

.12. Mussels 5 2 Quarterly Gamma Isotopic on each sample (edible portion)

13. Oysters 4 Quarterly Gamma Isotopic on each sample (edible portion)

14. Clams 2 Quarterly Gamma Isotopic on each sample (edible portion) __ _ __ _ __ _Isotopico

15. Lobster 2 Quarterly Gamma Isotopic on each sample (edible portion)

Footnotes

1. Two or more TLDs or TLD with two or more elements per location.

2. Beginning July 1, milk not required.

3. Pasture grass as a substitute for milk not required during the first quarter.

4. Beginning July 1, flounder not required.

5. Beginning July 1, mussel not required.

2-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 2.2 Samples Collected During Report Period The following table summarizes the number of samples of each type collected and analyzed during 2014:

Number of Number of Technical Technical Specification Specification Number of Sample Type Extra Samples Re ' ired Samples Required Samples Analyzed Analyzed Gamma Exposure 156 156 20 (Environmental TLD)

Air Particulates 312 312 0 Air Iodine 312 312 0 Soil 3 3 0 Cow and Goat Milk 161 0 181 Pasture Grass/Feed 42 42 82 Broad Leaf Vegetation, 10 10 6 Fruit, Vegetables Well Water 12 12 24 Sea Water 16 16 0 Bottom Sediment 10 10 2 Aquatic Flora 0 0 20 Fish 12 83 0 Mussels 4 23 0 Oysters 16 16 0 Clams 8 8 0 Lobster 8 8 0 Total All Types 899 877 98 1 Goat milk required; cow milk is extra.

2 Pasture grass sampled as necessary to substitute for unavailable goat milk. Not required during the first quarter. Four samples collected for two months when goats would have been on pasture. Extra samples are feed which are not required.

3 Due to sample unavailability, not all required fish and shellfish samples could be obtained 2-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 2.3 Required Samples Not Collected During the Report Period During 2014 there were 22 required samples not collected. These included, sixteen goat milk, four fish and two mussel samples.

Goat milk samples were not collected during 2014 because the goat owners at the two required locations were not milking, their goats. No other milking goats could be located within ten miles of the station. HbPwever, the REMODCM requires pasture grass as 'a substitute for goat milk when milk is not available. For the months of January thru Ap Ql pasture grass was not available at the two required locations. Feed was substituted for the required pasture grass.

Repeated attempts were made to collect two types of fish (flounder and one other type) at the two required locations during the first quarter (January thru March) but were unsuccessful.

Mussels were not available or the sample collected was too small for analyses at one required locations for first two quarters of the year. Requirement to collect mussels was dropped during second half of year.

2-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014

3. RADIOCHEMICAL RESULTS 3.1 Summary Table In accordance with the REMODCM,Section I.F.1, a summary table of the radiochemical results has been prepared and is presented on the following pages. The mean and range recorded are based only upon detectable measurements.

A more detailed analysis of the data is given in Section 4.0 where a discussion of the variations in the data explains many aspects thiat are not evident in the Summary Table because of th-e basic limitation of data summaries. The data summaries include the extra ("X") sampl6s collected throughout the year. These samples are taken to enhance the monitoring program or replace samples from required locations when they are not available.

3-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2014 Medium or Indicator Control Pathway Analysis Total LLD' Locations Location with Highest Mean Locations Sampled Type Number Mean Distance Mean Mean (Units) (Range) Number Direction (Range) (Range)

Direct Gamma 176 NA 7.7 9 0.04 Mi. 10.9 7.5 Radiation Dose , (4.5-11.8) W (10.4 -11.8) (5.6-9.5)

TLD (uR/hr)

Air Iodine 1-131 312 0.07 <LD NA NA <LLD <LLD (pCi/rn 3)

Air Particulate GR-B 312 0.01 13.8 11 1.6 Mi. 14 13.8 (pCi/rn 3) (5.3-28.2) ENE (7.6-23.6) (8.9-25.6)

GAMMA BE-7 32 NA 107 11 1.6 Mi. 112 102 (66-159) ENE (86-159) (86-119)

Other Note 2 <LLD NA NA <LLD <LLD Gammas Soil GAMMA 3 (pCilgdry) K-40 NA 17.1 3 0.3 Mi. 18.1 13.1 (16.1 - 18.1) NE NA NA CS-137 0.18 0.35 4 1.0 Mi. 0.59 0.79 (0.11 - 0.59) N NA NA Other Note 3 <LLD NA NA <LLD <LLD Gammas Milk - Note 4 SR-89 4 10 NA NA NA NA <LLD (pCi/I)

SR-90 4 2 NA NA NA NA <LLD GAMMA 18 K-40 NA NA NA NA NA 1277 NA (1042 -1469)

Other Note 5 NA NA NA NA <LLD Gammas Pasture Grass/Hay GAMMA 16 (pCi/g wet) K-40 NA 8.0 21 2.7 Mi. 8.0 6.2 (5.5- 12.6) NE (5.5- 12.6) (4.3-9.1) 1-131 0.06 <LLD NA NA NA <LLD CS-137 0.08 <LLD NA NA NA <LLD Other Note 6 <LLD NA NA <LLD <LLD Gammas 3-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2014 Medium or Indicator Control 1

Pathway Analysis Total LLD Locations Location with Highest Mean Locations Sampled Type Numbe Mean Distance Mean Mean (Units) (Range) NumberI Direction (Range) (Range)

Well Water - Note 7 H-3 36 2000 <LLD NA NA NA NA (pCi/I)

GAMMA 36 K-40 N1A 66 82 Onsite 66 NA Other Note 8 <LLD NA NA NA NA Gammas Fruits & Vegetables GAMMA 8 (pCi/g wet) K-40 NA 2.623 25 Within 5 miles 4.21 2.759 (0.789 - 4.269) (4.14 - 4.27) (0.568 - 4.776)

Other Note 9 <LLD NA NA NA NA Gammas Broad Leaf Vegetation GAMMA 12 (pCi/g wet) BE-7 NA 0.555 01 0.6 Mi. 0.555 <LLD NA NNW NA K-40 NA 2.566 01 0.6 Mi. 2.566 <LLD NNW NA CS-137 0.08 <LLD NA NA NA <LLD Other Note 10 <LLD NA NA NA <LLD Gammas Sea Water H-3 16 NA 639 32 < 0.1 Mi 639 <LLD (pCi/I) (209-1170) (209-1170)

GAMMA 16 K-40 NA 285 32 < 0.1 Mi. 285 291 (201 -409) (201 -409) (252- 328)

Other Note 8 <LLD NA NA NA <LLD Gammas Bottom Sediment GAMMA 14 (pCi/g dry) K-40 NA <LLD NA NA NA <LLD CS-137 0.18 <LLD NA NA NA <LLD Other Note 3 <LLD NA NA NA <LLD Gammas 3-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2014 Medium or Indicator Control Pathway Analysis Total LLD' Locations Location with Highest Mean Locations Sampled Type Number Mean Distance Mean Mean (Units) (Range) Number Direction (Range) (Range)

Aquatic Flora - Note 11 GAMMA 20 (pCilg wet) BE-7 NA 0.224 29 < 0.5 Mi. 0.259 0.196 (0.154 - 0.259) SSW to W NA NA K-40 NA 7.21 32 0.1 Mi. 8.26 6.80 (5.58 - 8.40) (8.00 - 8.40) (5.80 - 7.29) 1-131 0.06 <LLD NA NA NA NA Other <LLD NA NA NA NA Gammas Fish - Flounder GAMMA 1 (pCi/g wet) K-40 NA <LLD NA NA NA NA Other Note 12 <LLD NA NA NA NA Gammas Fish - Other GAMMA 7 (pCi'g wet) K-40 NA <LLD NA NA NA NA Other Note 12 <LLD NA NA NA NA Gammas Mussels GAMMA 2 (pCi/g wet) K-40 NA <LLD NA NA NA NA Other Note 12 <LLD NA NA NA NA Gammas Oysters GAMMA 16 (pCi/g wet) K-40 NA <LLD NA NA NA <LLD Other Note 12 <LLD NA NA NA <LLD Gammas Clams GAMMA 8 (pCL/g wet) K-40 NA <LLD NA NA NA NA Other Note 12 <LLD NA NA NA NA Gammas Lobster GAMMA 8 (pCilg wet) K-40 NA <LLD NA NA NA <LLD Other Note 12 <LLD NA NA NA <LLD Gammas 3-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 NOTES FOR

SUMMARY

TABLE 1 - The required LLD. LLD is the smallest concentration of radioactivity that will be detected with 95% confidence that the activity is real. See detailed discussion below.

2 - LLDs for air particulate other gamma are 0.05 pCi/M 3 for Cs-1 34 and 0.06 pCi/M 3 for Cs-1 37.

3 - LLD for soil and sediment other gamma is 0.15 pCi/g for Cs-1 34.

4- Indicator location for milk was goat milk at Location 21 (2.7 miles NE) for January thru June. Goat milk was not avaijable during first half of year. Requirement to collect goalt milk was deleted in second half bf year. Cow milk was collected throughout the yea' at a location 10.5 miles in the WNW direction. This is an extra (not required) sample, but results for this location are shown as a control location.

5 - LLDs for milk other gamma are 1 pCi/I for 1-131, 15 pCi/I for Cs-1 34, 18 pCi/I for Cs-1 37, 70 pCi/I for Ba-140 and 25 pCi/I for La-140.

6- LLD for grass/hay other gamma is 0.15 pCi/g for Cs-134.

7 - One well water had positive K-40 of 66 pCi/I.

8- LLDs for water other gamma are 15 pCi/I for Mn-54, Co-58, Co-60, Nb-95, 1-131, Cs-134 and La-140; 30 pCi/I for Fe-59, Zn-65 and Zr-95; 18 pCi/I for Cs-137 and 60 pCi/I for Ba-140.

9 - LLDs for fruits & vegetables, broadleaf vegetation and aquatic flora for other gamma are 0.06 pCi/M 3 for 1-131, 0.06 pCi/M 3 for Cs-1 34 and 0.08 pCi/M 3 for Cs-1 37.

10 - LLDs for other gamma are 0.06 pCi/g for Cs-1 34 and 1-131.

11 - All aquatic flora locations are extra, non-required samples with Locations 29, 32 and 35 treated as indicators and Location 36 as a control.

12 - LLDs for fish and shellfish for gammas are 0.13 pCi/g for Mn-54, Co-58, Co-60 and Cs-1 34; 0.26 pCi/g for Fe-59 and Zn-65; and 0.15 pCi/g for Cs-137.

3-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Discussion of LLD The LLD at a confidence level of 95% is the smallest concentration of radioactive material in a sample that will be detected with a 5% probability of falsely concluding that a blank observation represents a "real" signal.

For a particular measurement system (which may include radiochemical separation):

LLD- 4.66 Sb E

• V

• 2.22

• Y

• exp (-AAt)

LLD is the lower limit of detection as defined above (as pCi per unit mass or volume)

Sb is the standard deviation of the background counting rate or of the counting rate of a blank sample as appropriate (as counts per minute)

E is the counting efficiency (as counts per transformation)

V is the sample size (in units of mass or volume) 2.22 is the number of transformation per minute per picoCurie Y is the fractional radiochemical yield (when applicable)

A is the radioactive decay constant for the particular radionuclide Xt is the elapsed time between sample collection (or end of the sample collection period) and time of counting The LLD is defined as "a priori" (before the fact) limit representing the capability of a measurement system and not an "a posteriori" (after the fact) limit for a particular measurement.

Analyses was performed in such a manner that the stated LLDs were achieved under routine conditions. Occasionally background fluctuations, unavoidably small sample sizes, the presence of interfering nuclides, or other uncontrollable circumstances may have rendered these a priori LLDs unachievable. In such cases, the contributing factors are identified and described in this report. As shown in the equation above, for composite samples taken over a period of time, the LLD is decayed to the end of the sample period.

3-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 3.2 Data Tables The data reported in this section are strictly counting statistics. The reported error is two times the standard deviation (2a) of the net activity. Unless otherwise noted, the overall error (counting, sample size, chemistry, errors, etc.) is estimated to be 2 to 5 times that listed.

Results are considered positive when the measured value exceeds 1.5 times the listed 2a error (i.e., the measured value exceeds 3 G). Any errors listed as zero are the artifact that there were no background counts in the area of the peak for these nuclides.

Because of counting statistics, negative values, zeros and numbers below the Minimum Detectable Level (MDL) are statistically valid pieces of data. For the purposes of this report, in order to indicate any background biases, all the valid data are presented. This practice was recommended by Health and Safety Laboratory (HASL) ("Reporting of Analytical Results from HASL," letter by Leo B. Higginbotham), NUREG 0475 and NUREG/CR-4007 (Sept.

1984). In instances where zeros are listed after significant digits, this is an artifact of the computer data-handling program.

Data are given according to sample type as indicated below.

1. Gamma Exposure Rate

2. Air Particulates, Gross Beta Radioactivity

3. Air Particulates, Airborne 1-131

4. Air Particulates, Gamma Spectra

5. Air Particulates, Strontium*

6. Soil

7. Milk- Cow

8. Milk - Goat**

9. Pasture Grass/Hay/Feed

10. Well Water

11. Reservoir Water*

12. Fruits & Vegetables

13. Broad Leaf Vegetation

14. Seawater

15. Bottom Sediment

16. Aquatic Flora (Fucus)

17. Fin Fish

18. Mussels**

19. Oysters

20. Clams

21. Scallops*

22. Lobster

• This type of sampling or analysis was not performed.

• • Goat milk and mussels were only collected the first half of year.

3-7

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 1 QUARTERLY GAMMA EXPOSURE RATE (uR/hr)*

LOCATIONS PERIOD 1 2 3 4 5 6(+--- 7 8 9

(+--)

10 11

(+--)

(+1-) (+--) (+--) (+--) (+--) (+--) (+--)

10 7.7 0.5 9.1 0.5 6.9 0.4 7.0 0.5 8.7 0.6 8.3 0.6 5.2 0.5 10.3 0.5 10.5 0.8 9.4 0.5 6.7 0.4 2Q 8.0 1.0 9.8 0.9 7.5 0.8 7.8 0.8 8.8 1.1 8.6 0.9 4.8 0.7 10.6 1.6 10.4 1.0 9.9 1.0 6.7 0.8 3Q 8.1 0.9 9.9 0.9 7.3 0.7 7.4 0.8 9.4 0.7 8.2 0.7 4.5 0.5 10.8 1.1 11.1 0.8 9.4 0.7 6.9 0.7 4Q 8.3 0.5 10.0 0.7 7.9 0.7 8.1 0.5 9.6 0.8 8.9 0.5 5.2 0.5 11.5 1.0 11.8 0.7 10.2 1.0 7.3 0.8 PERIOD 12C 13C 14C 15C 16C 27 41 42 43 44 45

(+/-) (+/-) - )

(+- (+1-) (+--) (+--) (+/-) (+--) (+--)

1Q 7.1 0.4 8.3 0.4 8.1 0.5 6.7 0.3 5.9 0.4 8.2 0.6 6.5 0.6 6.9 0.7 7.2 0.6 7.1 0.8 7.0 0.6 2Q 7.1 0.7 8.3 0.8 9.0 1.0 7.3 0.7 6.0 0.7 8.4 0.9 6.7 0.7 7.3 0.8 7.2 0.8 8.0 1.4 6.8 0.7 3Q 7.0 0.6 8.0 0.6 8.4 0.7 7.3 0.6 5.6 0.5 7.9 0.6 6.4 0.6 7.0 0.6 6.6 0.6 7.6 0.7 6.8 0.6 4Q 7.8 0.5 9.4 0.6 9.5 0.6 7.8 0.5 6.4 0.5 8.7 0.7 6.7 0.5 7.6 0.7 7.6 0.6 8.7 1.0 7.6 0.7 PERIOD 46 47 48 49 50 51 52 53 55 56 57

(+1-) (+--) (+--) (+--) (+--) (+1-) (+1-) (+- -) (+--)

(+/-) (+1-')

1Q 8.2 0.4 7.5 0.6 9.0 0.5 6.6 0.4 7.5 0.8 6.1 0.4 6.9 0.4 6.7 0.6 7.3 0.8 7.1 0.5 7.1 0.4 2Q 8.6 1.0 7.5 0.7 9.5 1.1 7.0 1.0 7.6 0.8 6.0 1.0 7.4 0.8 7.0 0.7 6.8 0.8 7.1 0.7 6.9 1.0 3Q 7.9 0.7 7.0 0.6 9.0 0.8 6.5 0.5 7.1 0.7 5.4 0.6 6.7 1.0 6.7 0.7 6.8 0.7 6.6 0.5 6.7 0.5 4Q 9.2 1.0 8.3 0.6 9.7 0.8 7.5 0.7 8.0 0.7 6.8 0.5 7.3 0.5 7.7 0.6 7.7 0.6 7.4 0.5 7.5 0.7 PERIOD 59 60 61 62 63 64 65 66 73 74 75

(+1-) (+/-) (+1-) (+--) (+--) (+--) (+--) (+--) (+--) (+--) (+/-)

1Q 7.1 0.5 6.2 0.5 6.6 0.5 7.7 0.6 8.9 0.7 7.3 0.4 7.5 0.5 7.0 0.5 7.8 0.6 7.5 0.4 6.5 0.4 2Q 7.8 0.9 6.4 0.7 6.8 0.7 7.8 0.9 8.0 1.0 6.9 0.7 7.3 0.7 6.3 0.7 7.4 0.7 7.0 0.8 6.7 0.7 3Q 7.5 0.6 6.7 0.5 6.8 0.7 7.6 0.7 8.1 0.6 7.1 0.8 7.3 0.7 6.7 0.6 7.2 0.6 7.2 0.6 6.9 0.8 4Q 8.0 0.5 7.1 0.6 7.7 0.7 8.3 0.5 8.6 0.8 7.7 0.6 8.1 0.8 7.2 0.6 7.9 0.7 8.1 0.7 7.1 0.6 READINGS ARE THE AVERAGE OF MULTI CaSo4(Tm) PHOSPHOR ELEMENTS WITHIN ONE PANASONIC TLD BADGE ERRORS ARE TWO SIGMA AND INCLUDE COUNTING, TRANSIT, READER AND FADE UNCERTAINTIES 3-8

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 2 AIR PARTICULATES GROSS BETA RADIOACTIVITY (pCi/rn 3)

LOCATIONS PERIOD

-ENDING 01 --- --- 02 ---- . 03 ---- 04 - -- --- ---- 11 ---- ---- 27 ----- ---- 15C 01/06/14 0.014 0.003 0.012 0.003 0.014 0.003 0.015 0.003 0.016 0.003 M~17 0.003 0.016 0.003 0.019 0.003 01/13/14 0.017 0.004 0.019 0.004 0.015 0.003 0.015 0.003 0.017 0.003 0.021 0.004 0.016 0.003 0.016 0.003 01/21/14 0.016 0.003 0.016 0.003 0.018 0.003 0.016 0.003 0.022 0.004 0.019 0.003 0.020 0.003 0.018 0.003 01/27/14 0.014 0.004 0.012 0.004 0.011 0.003 0.013 0.004 0.014 0.004 0.014 0.004 0.015 0.004 0.013 0.004 02/03/14 0.017 0.004 0.020 0.004 0.018 0.004 0.020 0.004 0.021 0.004 0.020 0.004 0.020- 0.004 0.017 0.004 02/10/14 0.020 0.003 0.020 0.004 0.019 0.003 0.020 0.004 0.021 0.004 0.017 0.003 0.017 0.004 0.017 0.003 02/17/14 0.017 0.003 0.019 0.004 0.015 0.003 0.018 0.004 0.017 0.004 0.018 0.004 0.022 0.004 0.019 0.004 02/24/14 0.013 0.003 0.012 0.004 0.011 0.003 0.011 0.003 0.011 0.003 0.014 0.003 0.013 0.003 0.012 0.003 03/03/14 0.027 0.004 0.024 0.004 0.028 0.004 0.027 0.004 0.028 0.004 0.023 0.004 0.023 0.004 0.026 0.004 03/10/14 0.019 0.004 0.022 0.004 0.019 0.004 0.019 0.004 0.019 0.004 0.024 0.004 0.022 0.004 0.024 0.004 03/17/14 0.019 0.004 0.015 0.004 0.016 0.004 0.016 0.004 0.015 0.004 0.015 0.004 0.016 0.004 0.018 0.004 03/24/14 0.012 0.003 0.012 0.003 0.013 0.003 0.014 0.003 0.010 0.003 0.015 0.004 0.010 0.003 0.011 0.003 03/31/14 0.017 0.003 0.015 0.003 0.013 0.004 0.015 0.004 0.015 0.003 0.016 0.004 0.015 0.003 0.015 0.003 04/07/14 0.017 0.004 0.013 0.003 0.012 0.003 0.013 0.003 0.012 0.003 0.011 0.003 0.012 0.003 0.013 0.003 04/15/14 0.016 0.003 0.016 0.003 0.013 0.004 0.017 0.003 0.016 0.003 0.021 0.004 0.015 0.003 0.015 0.003 04/21/14 0.020 0.004 0.019 0.004 0.019 0.004 0.019 0.004 0.018 0.004 0.017 0.004 0.018 0.004 0.014 0.003 04/28/14 0.009 0.003 0.009 0.003 0.012 0.003 0.013 0.004 0.012 0.003 0.013 0.004 0.012 0.003 0.009 0.003 05/05/14 0.008 0.003 0.010 0.003 0.009 0.003 0.010 0.003 0.008 0.003 0.008 0.003 0.011 0.003 0.009 0.003 05/12/14 0.013 0.003 0.017 0.004 0.013 0.003 0.012 0.004 0.013 0.003 0.013 0.004 0.013 0.003 0.011 0.003 05/19/14 0.014 0.003 0.013 0.003 0.011 0.003 0.010 0.003 0.011 0.003 0.013 0.003 0.012 0.003 0.013 0.003 05/27/14 0.010 0.002 0.010 0.002 0.009 0.002 0.012 0.003 0.011 0.003 0.011 0.002 0.011 0.003 0.012 0.003 06/03/14 0.010 0.003 0.009 0.002 0.009 0.003 0.009 0.003 0.010 0.003 0.010 0.003 0.010 0.003 0.009 0.003 06/10/14 0.011 0.003 0.008 0.003 0.010 0.003 0.009 0.003 0.008 0.003 0.009 0.003 0.009 0.003 0.010 0.003 06/17/14 0.016 0.003 0.016 0.003 0.014 0.003 0.014 0.003 0.014 0.003 0.011 0.003 0.012 0.003 0.014 0.003 06/24/14 0.012 0.003 0.011 0.003 0.013 0.003 0.011 0.003 0.012 0.003 0.010 0.003 0.012 0.003 0.012 0.003 3-9

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 2 AIR PARTICULATES GROSS BETA RADIOACTIVITY (pCi/m 3)

LOCATIONS PERIOD ENDING 01 02 03 04 10 11 27 15C

(+/-) (+/-) (+/-) (+/-) (+/-) (+/-) (+/-) (+/-)

07/01/14* 0.012 0.003 0.008 0.003 0.011 0.003 0.011 0.003 0.010 0.003 0.010 0.003 0.010 0.003 0.010 0.003 07/15/14 0.012 0.002 0.010 0.002 0.012 0.002 0.011 0.002 0.012 0.002 0.011 0.002 0.013 0.002 0.013 0.002 07/29/14 0.012 0.002 0.011 0.002 0.011 0.002 0.010 0.002 0.012 0.002 0.010 0.002 .O0.140 0.002 0.011 0.002 08/12/14 0.011 0.002 0.011 0.002 0.011 0.002 0.011 0.002 0.011 0.002 0.014 0.002 0.012 0.002 0.010 0.002 08/26/14 0.010 0.002 0.011 0.002 0.009 0.002 0.010 0.002 0.012 0.002 0.008 0.002 0.009 0.002 0.010 0.002 09/09/14 0.013 0.002 0.014 0.002 0.012 0.002 0.013 0.002 0.013 0.002 0.013 0.002 0.014 0.002 0.013 0.002 09/23/14 0.011 0.002 0.012 0.002 0.015 0.002 0.012 0.002 0.013 0.002 0.012 0.002 0.011 0.002 0.011 0.002 10/07/14 0.015 0.002 0.013 0.002 0.013 0.002 0.012 0.002 0.014 0.002 0.014 0.002 0.011 0.002 0.013 0.002 10/21/14 0.005 0.001 0.014 0.002 0.015 0.002 0.013 0.002 0.011 0.002 0.012 0.002 0.013 0.002 0.014 0.002 11/04/14 0.012 0.002 0.012 0.002 0.012 0.002 0.012 0.002 0.011 0.002 0.013 0.002 0.014 0.002 0.014 0.002 11/18/14 0.015 0.002 0.014 0.002 0.017 0.003 0.015 0.002 0.014 0.002 0.014 0.002 0.013 0.002 0.016 0.002 12/02/14 0.017 0.002 0.016 0.002 0.015 0.002 0.016 0.002 0.010 0.002 0.015 0.002 0.016 0.002 0.018 0.002 12/16/14 0.012 0.002 0.012 0.002 0.011 0.002 0.011 0.002 0.012 0.002 0.011 0.002 0.011 0.002 0.009 0.002 12/30/14 0.011 0.002 0.012 0.002 0.013 0.002 0.011 0.002 0.010 0.002 0.011 0.002 0.012 0.002 0.013 0.002

• AIR PARTICULATE COLLECTION CHANGED FROM WEEKLY TO BI-WEEKLY 3-10

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 3 AIRBORNE IODINE (pCi/rn 3)

LOCATIONS PERIOD ENDING 01 -C7- - --- 02 03 - --- 04 T7---- ---- 10 (7 --- 11 -,1 -- ----- 27 -+T - - 15C + )

01/06/14 0.014 0.037 0.016 0.040 0.013 0.035 0.016 0.041 -0.038 0.035 -0.041 0.038 -0.038 0.035 -0.039 0.036 01/13/14 0.000 0.012 0.000 0.013 0.000 0.011 0.000 0.013 0.004 0.012 0.004 0.013 0-00A. _~0.013 0.004 0.013 01/21/14 0.018 0.023 0.020 0.027 0.017 0.023 0.020 0.026 -0.018 0.023 -0.020 0.025 -0.020 0.025 -0.019 0.024 01/27/14 0.019 0.025 0.022 0.028 0.019 0.024 0.021 0.028 0.009 0.033 0.010 0.036 0.009 0.034 0.009 0.035 02/03/14 -0.032 0.038 -0.036 0.044 -0.031 0.037 -0.035 0.041 0.016 0.036 0.017 0.038 0.017 0.037 0.017 0.038 02/10/14 0.009 0.018 0.011 0.020 0.009 0.017 0.010 0.019 0.014 0.019 0.015 0.021 0.019 0.026 0.015 0.020 02/17/14 0.012 0.033 0.014 0.038 0.012 0.032 0.013 0.036 0.015 0.039 0.002 0.040 0.015 0.040 0.002 0.040 02/24/14 0.013 0.031 0.015 0.036 0.013 0.031 0.014 0.034 -0.008 0.034 -0.009 0.036 -0.009 0.035 -0.009 0.036 03/03/14 0.005 0.032 0.005 0.037 0.005 0.031 0.005 0.035 -0.006 0.035 -0.006 0.037 -0.006 0.035 -0.006 0.037 03/10/14 -0.001 0.031 -0.002 0.036 -0.001 0.030 -0.001 0.034 -0.020 0.036 -0.021 0.038 -0.020 0.036 -0.021 0.038 03/17/14 -0.028 0.036 -0.033 0.043 -0.028 0.036 -0.032 0.041 0.000 0.028 0.000 0.031 0.000 0.029 0.000 0.030 03/24/14 0.007 0.036 0.008 0.039 0.007 0.035 0.007 0.038 0.009 0.034 0.010 0.037 0.009 0.034 0.010 0.036 03/31/14 -0.006 0.024 -0.006 0.026 -0.007 0.030 -0.006 0.027 -0.009 0.028 -0.009 0.030 -0.009 0.027 -0.009 0.029 04/07/14 -0.012 0.026 -0.013 0.029 -0.014 0.030 -0.013 0.029 0.016 0.029 0.017 0.032 0.015 0.029 0.017 0.031 04/15/14 -0.004 0.025 -0.005 0.028 -0.006 0.036 -0.005 0.028 0.003 0.037 0.003 0.041 0.003 0.037 0.003 0.040 04/21/14 0.000 0.013 0.000 0.014 0.000 0.013 0.000 0.014 -0.002 0.014 -0.003 0.015 -0.002 0.014 -0.002 0.015 04/28/14 0.007 0.020 0.008 0.022 0.008 0.021 0.008 0.022 0.005 0.022 0.006 0.025 0.005 0.022 0.006 0.024 05/05/14 -0.002 0.038 -0.003 0.042 -0.003 0.040 -0.003 0.042 -0.013 0.028 -0.014 0.030 -0.013 0.027 -0.014 0.030 05/12/14 -0.009 0.024 -0.010 0.026 -0.010 0.025 -0.010 0.026 0.008 0.023 0.009 0.027 0.009 0.024 0.009 0.026 05/19/14 0.004 0.036 0.004 0.035 0.004 0.036 0.004 0.037 -0.012 0.037 -0.011 0.035 -0.011 0.036 -0.011 0.037 05/27/14 -0.007 0.022 -0.007 0.021 -0.007 0.021 -0.007 0.022 -0.008 0.020 -0.008 0.019 -0.008 0.020 -0.008 0.020 06/03/14 0.001 0.009 0.001 0.009 0.001 0.009 0.001 0.009 0.010 0.010 0.009 0.010 0.010 0.010 0.010 0.010 06/10/14 -0.013 0.035 -0.013 0.034 -0.013 0.034 -0.014 0.036 -0.016 0.034 -0.015 0.033 -0.016 0.034 -0.016 0.034 06/17/14 0.017 0.028 0.016 0.027 0.016 0.027 0.017 0.028 -0.028 0.028 -0.026 0.026 -0.028 0b.027 -0.028 0.027 06/24/14 -0.008 0.034 -0.008 0.033 -0.008 0.033 -0.008 0.035 0.011 0.038 0.010 0.036 0.010 0.037 0.010 0.036 3-11

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 3 AIRBORNE IODINE (pCi/m 3)

LOCATIONS PERIOD ENDING 01 02 03 04 10 11 27 15C 07/01/14* -0.001 0.022 0.003 0.031 0.003 0.030 0.003 0.030 0.003 0.031 -0.002 0.023 -0.001 0.022 -0.002 0.023 07/15/14 -0.031 0.041 -0.007 0.039 -0.007 0.038 -0.007 0.038 -0.007 0.040 -0.033 0.043 -0.030 0.040 -0.031 0.041 07/29/14 -0.004 0.011 -0.011 0.014 -0.010 0.013 -0.011 0.013 -0.011 0.014 -0.004 0.012 -0.004 0.011 -0.004 0.011 08/12/14 0.013 0.014 0.003 0.015 0.003 0.015 0.003 0.015 0.003 0.016 0.013 0.014 0.012 0.013 0.013 0.014 08/26/14 0.035 0.032 0.006 0.037 0.006 0.036 0.006 0.036 0.006 0.038 0.036 0.033 0.034 0.031 0.037 0.034 09/09/14 -0.002 0.024 -0.014 0.023 -0.015 0.024 -0.014 0.023 -0.015 0.024 -0.002 0.024 -0.002 0.023 -0.002 0.026 09/23/14 0.000 0.013 0.000 0.013 0.000 0.013 0.000 0.013 0.000 0.013 0.000 0.014 0.000 0.013 0.000 0.014 10/07/14 -0.009 0.010 -0.001 0.011 -0.001 0.011 -0.001 0.011 -0.001 0.012 -0.009 0.010 -0.008 0.010 -0.009 0.011 10/21/14 -0.008 0.016 0.022 0.024 0.023 0.026 0.022 0.024 0.024 0.026 -0.008 0.017 -0.007 0.016 -0.008 0.018 11/04114 0.001 0.007 -0.004 0.006 -0.004 0.007 -0.004 0.006 -0.004 0.007 0.002 0.007 0.001 0.007 0.002 0.008 11/18114 -0.019 0.029 0.003 0.006 0.003 0.007 0.006 0.012 0.004 0.007 -0.019 0.029 -0.018 0.027 -0.021 0.031 12/02/14 0.001 0.007 0.001 0.006 0.001 0.007 0.001 0.006 0.001 0.007 0.001 0.007 0.001 0.007 0.001 0.008 12/16/14 -0.026 0.042 -0.014 0.032 -0.017 0.040 -0.015 0.035 -0.017 0.040 -0.027 0.043 -0.024 0.039 -0.029 0.046 12/30/14 -0.020 0.029 0.002 0.021 0.002 0.025 0.002 0.022 0.002 0.025 -0.021 0.030 -0.019 0.028 -0.023 0.034

• AIRBORNE IODINE COLLECTION CHANGED FROM WEEKLY TO BI-WEEKLY 3-12

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 4 AIR PARTICULATES 3

(pCi/m )

GAMMA SPECTRA - QTR 1 (12/30/13 - 03/31/2014)

LOCATION Be-7 Mn-54 Co-58 Co-60 Zn-65 Nb-95 Zr-95

(+/-) (+1-) (+1-) (.--) (+--). (+/-) (+/-)

01 0.1126 0.0307 -0.0007 0.0017 0.0013 0.0028 -0.0012 0.0012 0.0017 0.0032 -0.0002 0.0025 -0.0013 0.0044 02 0.1444 0.0389 0.0002 0.0021 -0.0005 0.0033 0.0018 0.0020 0.0028 0.0043 0.0011 0.0031 -0.0020 0.0060 03 0.1476 0.0344 0.0001 0.0015 0.0011 0.0019 0.0006 0.0012 -0.0004 0.0030 0.0010 0.0023 0.0008 0.0037 04 0.0962 0.0291 -0.0001 0.0012 0.0005 0.0025 -0.0014 0.0018 0.0005 0.0037 -0.0012 0.0027 0.0007 0.0050 10 0.1050 0.0317 0.0006 0.0022 0.0002 0.0026 -0.0008 0.0016 0.0038 0.0039 0.0001 0.0033 0.0016- 0.0056 11 0.0888 0.0315 0.0001 0.0013 -0.0009 0.0022 -0.0004 0.0012 0.0004 0.0024 -0.0007 0.0022 . 0.0011 0.0037 27 0.0955 0.0229 0.0001 0.0011 -0.0003 0.0016 -0.0002 0.0011 0.0009 0.0028 0.0002 0.0019- 0.0002 0.0034 15C 0.0916 0.0256 0.0001 0.0012 0.0019 0.0018 0.0008 0.0011 0.0019 0.0030 -0.0019 0.0023 0.0018 0.0041 LOCATION Ru-103 Ru-106 Cs-134 Cs-137 Ba-140 Ce-141 Ce-144 01 -0.0017 0.0044 -0.0043 0.0141 0.0022 0.0015 0.0007 0.0014 -0.0266 0.1934 0.0017 0.0060 -0.0022 0.0068 02 0.0045 0.0055 -0.0159 0.0180 0.0021 0.0019 -0.0008 0.0018 0.0140 0.1906 -0.0093 0.0079 -0.0012 0.0101 03 0.0009 0.0033 -0.0004 0.0108 0.0010 0.0013 0.0005 0.0011 0.0512 0.1483 0.0017 0.0049 -0.0029 0.0054 04 -0.0028 0.0038 -0.0052 0.0127 -0.0017 0.0015 -0.0001 0.0014 0.0309 0.2056 -0.0014 0.0051 0.0039 0.0062 10 0.0013 0.0047 -0.0009 0.0193 0.0001 0.0018 0.0004 0.0018 0.1164 0.2048 0.0017 0.0072 -0.0013 0.0077 11 0.0003 0.0032 -0.0080 0.0096 0.0001 0.0011 -0.0010 0.0010 -0.0165 0.1760 -0.0027 0.0043 -0.0022 0.0056 27 -0.0003 0.0028 -0.0057 0.0084 0.0001 0.0011 -0.0004 0.0009 0.0301 0.1253 -0.0038 0.0048 -0.0036 0.0053 15C -0.0016 0.0033 -0.0007 0.0117 0.0002 0.0011 -0.0003 0.0011 -0.0568 0.1635 -0.0033 0.0048 0.0008 0.0057 GAMMA SPECTRA - QTR 2 (03/31/14 - 07/01/14)

LOCATION Be-7 Mn-54 Co-58 Co-60 Zn-65 Nb-95 Zr-95

(+/-) (+/-) (+/-) (+/-) (+/-) (71-) (+1-)

01 0.1061 0.0303 0.0006 0.0013 -0.0018 0.0021 0.0001 0.0014 0.0023 0.0033 -0.0014 0.0023 0.0022 0.0043 02 0.1112 0.0364 0.0007 0.0014 -0.0014 0.0023 -0.0005 0.0010 0.0008 0.0032 0.0002 0.0021 0.0010 0.0041 03 0.1146 0.0303 -0.0003 0.0011 -0.0001 0.0019 -0.0002 0.0013 0.0013 0.0031 0.0004 0.0022 -0.0020 0.0035 04 0.1418 0.0420 0.0004 0.0023 -0.0001 0.0036 0.0008 0.0017 0.0022 0.0050 0.0023 0.0036 -0.0034 0.0069 10 0.1399 0.0558 -0.0004 0.0011 -0.0026 0.0022 0.0003 0.0011 -0.0006 0.0028 0.0001 0.0023 0.0013 0.0036 11 0.1593 0.0478 0.0001 0.0021 0.0034 0.0033 0.0020 0.0019 -0.0013 0.0049 -0.0001 0.0035 -0.0031 0.0065 27 0.0852 0.0302 -0.0018 0.0020 -0.0003 0.0033 -0.0004 0.0015 -0.0013 0.0037 0.0010 0.0032 0.0017 0.0058 15C 0.1197 0.0320 0.0007 0.0010 -0.0016 0.0017 0.0006 0.0010 0.0001 0.0025 0.0016 0.0022 -0.0022 0.0037 LOCATION Ru-103 Ru-106 Cs-134 Cs-137 Ba-140 Ce-141 Ce-144

(+/-) F./) ----(,/ )--- -------(*/)--- ------ --- ).7 (+/-) (+/-)

01 -0.0003 0.0028 0.0039 0.0093 0.0004 0.0011 0.0009 0.0012 0.0157 0.1769 -0.0014 0.0034 -0.0036 0.0041 02 -0.0021 0.0040 -0.0061 0.0120 0.0007 0.0014 0.0004 0.0011 -0.0799 0.2270 0.0030 0.0060 0.0007 0.0060 03 -0.0028 0.0028 -0.0057 0.0119 0.0000 0.0011 0.0002 0.0009 -0.0533 0.2089 0.0042 0.0054 -0.0029 0.0054 04 0.0029 0.0058 -0.0037 0.0177 0.0002 0.0017 0.0006 0.0017 0.0278 0.3470 0.0006 0.0065 0.0029 0.0065 10 -0.0015 0.0036 0.0043 0.0119 0.0003 0.0012 0.0003 0:0011 -0.1497 0.1948 0.0007 0.0059 0.0031 0.0066 11 -0.0005 0.0112 0.0016 0.0199 0.0016 0.0019 -0.0002 0.0019 -0.0258 0.3443 0.0034 0.0091- " "-0.0004 0.0100 27 -0.0030 0.0064 -0.0112 0.0197 0.0008 0.0018 -0.0002 0.0017 -0.0532 0.3276 -0.0046 0.0078 -0.0019 0.0085 15C 0.0009 0.0029 0.0029 0.0085 0.0009 0.0009 -0.0002 0.0011 -0.0049 0.1661 -0.0032 0.0042 -0.0023 0.0045 3-13

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 4 AIR PARTICULATES 3

(PCi/m )

GAMMA SPECTRA - QTR 3 (07/01/14 - 10/07/14)

Be-7 Co-60 Zn-65 Nb-95 Zr-95 0-.0-001Mn-540.0.77 LOCATION Co-58

---

T--

. . ---------- - . ------------ F ----- ----- VT----

01 0.0748 0.0202 0.0001 0.0007 -0.0011 0.0011 0.0005 0.0006 0.0009 0.0019 0.0003 0.0013 0.0007 0.0018 02 0.1243 0.0300 0.0001 0.0012 -0.0002 0.0020 0.0010 0.0010 0.0026 0.0033 -0.0009 0.0020 0.0012 0.0033 03 0.1098 0.0280 0.0000 0.0009 -0.0003 0.0014 0.0000 0.0007 0.0003 0.0023 0.0006 0.0018 -0.0003 0.0030 04 0.1088 0.0251 -0.0010 0.0011 -0.0001 0.0017 -0.0006 0.0012 0.0003 0.0027 0.0008 0.0018 0.0009 0.0036 10 0.0981 0.0203 0.0001 0.0010 -0.0002 0.0017 0.0000 0.0008 0.0006 0.0022 -0.0010 0.0016 0.0003 0.0028 11 0.1121 0.0283 0.0002 0.0009 -0.0004 0.0015 0.0003 0.0008 -0.0001 0.0022 -0.0005 0.0017 0.0061 0.0037 27 0.1088 0.0335 0.0001 0.0006 0.0008 0.0010 0.0006 0.0006 0.0004 0.0015 0.0000 0.0011. .- -0.0002 0.0023 15C 0.0985 0.0374 0.0002 0.0010 0.0011 0.0013 0.0001 0.0009 0.0007 0.0024 -0.0005 0.0018 0.0006 0.0030 LOCATION Ru-103 Ru-106 Cs-134 Cs-137 Ba-140 Ce-141 Ce-144

---

T-- ---Fr-- -- T;T-3'

-0.0002 0.T-002 01 -0.0002 0.0022 -0.0043 0.0065 0.0003 0.0008 -0.0001 0.0005 0.0480 0.0926 -0.0002 0.0045 0.0015 0.0056 02 0.0001 0.0032 -0.0017 0.0099 0.0016 0.0014 0.0003 0.0012 -I0.1037 0.1536 0.0015 0.0086 -0.0030 0.0100 03 -0.0016 0.0025 0.0020 0.0084 0.0000 0.0009 0.0003 0.0008 -I0.0807 0.1229 -0.0023 0.0043 0.0006 0.0050 04 0.0014 0.0026 -0.0081 0.0114 0.0011 0.0012 -0.0003 0.0010 -I0.0993 0.1359 -0.0018 0.0039 -0.0002 0.0047 10 -0.0016 0.0027 -0.0049 0.0096 0.0013 0.0010 -0.0003 0.0008 -I0.0248 0.1182 -0.0001 0.0038 -0.0001 0.0042 11 0.0003 0.0027 -0.0053 0.0073 -0.0009 0.0009 -0.0004 0.0008 -I0.0004 0.1215 -0.0013 0.0029 0.0028 0.0035 27 0.0007 0.0016 0.0022 0.0045 0.0000 0.0007 -0.0002 0.0007 0.0442 0.0880 0.0039 0.0025 0.0004 0.0028 15C 0.0007 0.0028 -0.0032 0.0084 0.0001 0.0009 0.0004 0.0008 0.0295 0.1330 0.0011 0.0039 0.0002 0.0049 GAMMA SPECTRA - QTR 4 (10/07/14 - 12/30/14)

LOCATION Be-7 Mn-54

-0.0002"0.0-0 Co-58 Co-60 Zn-65 Nb-95

-0.0014-- Zr-95 0.-0T0

---T-- - - T- - r.. - -0.0002 0.0020 ---

01 0.0800 0.0262 -0.0002 0.0010 -0.0001 0.0020 -0.0005 0.0010 0.0023 0.0022 -0.0006 0.0021 -0.0014 0.0035 02 0.0657 0.0249 0.0005 0.0011 -0.0007 0.0018 0.0004 0.0009 - 0.0012 0.0026 -0.0013 0.0022 -0.0003 0.0034 03 0.0698 0.0270 -0.0010 0.0017 -0.0011 0.0022 0.0007 0.0013 0.0012 0.0025 0.0011 0.0038 0.0011 0.0025 -0.0041 0.0039 04 0.0973 0.0297 0.0000 0.0010 0.0013 0.0024 0.0007 0.0011 0.0007 0.0030 0.0010 0.0036 10 0.0916 0.0363 -0.0005 0.0022 0.0006 0.0039 0.0007 0.0027 - 0.0026 0.0049 0.0006 0.0061 11 0.0859 0.0324 -0.0004 0.0011 -0.0008 0.0018 -0.0008 0.0012 0.0010 0.0030 0.0001 0.0020 -0.0028 0.0037 27 0.1189 0.0399 0.0012 0.0022 0.0004 0.0029 -0.0004 0.0015 0.0013 0.0035 -0.0017 0.0032 0.0046 0.0061 15C 0.0981 0.0369 0.0000 0.0014 -0.0002 0.0025 -0.0006 0.0011 0.0038 0.0030 -0.0017 0.0028 0.0004 0.0048 LOCATION Ru-103 Ru-106 Cs-134 Cs-1i37 Ba-140 Ce-141 Ce-144

(+--)

01 -0.0035 0.0028 0.0029 0.0093 -0.0001 0.0011 0.0005 0.0010 - 0.0491 0.1258 -0.0003 0.0039 0.0020 0.0044 02 0.0010 0.0030 -0.0036 0.0095 0.0010 0.0010 -0.0003 0.0010 0.0567 0.1296 -0.0014 0.0046 0.0005 0.0053 03 0.0019 0.0037 0.0052 0.0095 0.0002 0.0013 -0.0004 0.0012 - 0.0479 0.1704 -0.0016 0.0053 0.0007 0.0057 04 0.0033 0.0032 0.0130 0.0106 0.0014 0.0012 -0.0008 0.0012 - 0.1066 0.1757 0.0007 0.00-9 -0.0020 0.0072 10 -0.0010 0.0061 0.0061 0.0156 -0.0001 0.0017 0.0006 0.0019 0.1117 0.3091 -0.0012 00063 0.0001 0.0073 11 -0.0003 0.0035 -0.0026 0.0102 -0.0003 0.0010 0.0004 0.0009 - 0.0334 0.1528 -0.0036 0.0052 -0.0065 0.0059 27 -0.0008 0.0054 -0.0073 0.0163 0.0014 0.0017 0.0009 0.0016 0.2612 0.2775 0.0001 0.0087 -0.0040 0.0093 15C 0.0022 0.0065 -0.0027 0.0134 0.0014 0.0014 0.0004 0.0013 0.0076 0.2063 0.0045 0.0081 0.0021 0.0090 3-14

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 5 AIR PARTICULATES Strontium Analyses for strontium in air particulate filters were not analyzed in 2014.

See discussion in Section 4.5.

3-15

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 6 SOIL (pCi/g dry wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 - Fe-59

(+/-)

03 11/05/14 0.076 0.391 18.060 1.708 -0.031 0.485 -0.035 0.044 -0.014 0.047 -0.078 0.108 04 11/04/14 0.031 0.594 16.110 1.847 -0.595 0.662 -0.053 0.064 0.067 0.066 0.010 0.135 14C 10/31/14 -0.049 0.492 13.120 1.585 0.030 0.590 -0.040 0.051 -0.034 0.053 0.106 0.118 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-)

03 11/05/14 0.002 0.038 -0.035 0.102 0.004 0.051 0.098 0.089 -0.003 0.050 0.090 0.380 04 11/04/14 -0.036 0.060 0.041 0.158 0.123 0.077 0.037 0.129 0.010 0.077 0.060 0.517 14C 10/31/14 0.009 0.042 -0.001 0.102 0.005 0.060 0.029 0.097 -0.029 0.062 0.040 0.433 COLLECTION LOCATION DATE Sb-1 25 Cs- 134 Cs-137 Ce-141 Ce-144 Ac-228

(+/-)

03 11/05/14 -0.029 0.105 0.029 0.039 0.113 0.070 0.100 0.081 -0.024 0.253 0.842 0.246 04 11/04/14 0.067 0.159 0.030 0.064 0.591 0.105 0.145 0.112 -0.221 0.346 0.072 0.556 14C 10/31/14 -0.033 0.119 0.041 0.048 0.786 0.106 0.028 0.093 -0.062 0.269 0.221 0.378 3-16

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 7 COW MILK (pCi/I)

COLLECTION LOCATION DATE 1-131 Sr-89 Sr-90 K-40 Cs-134 Cs-1 37 *--ýBa-140 La-140 C;/-) -- )7--

(+/---- (+/-)

22 01/23/14 -0.141 0.664 1373 125 -4.218 2.791 2.156 2.713 -30.080 19.940 7.910 6.680 02/19/14 -0.055 0.460 1283 170 -4.362 3.998 0.290 4.186 6.598 19.560 3.143 5.824 03/11/14 -0.172 0.405 6.8 4.8 -0.5 0.4 1469 166 -2.463 4.939 2.837 4.191 0.822 20.870 2.431 5.729 04/23/14 -0.325 0.293 1314 148 -1.773 3.292 1.847 3.382 -5.289 15.330 -2.591 5.474 05/14/14 -0.077 0.472 1042 153 -3.186 4.450 -3.581 4.678 4.094 17.070 -4.625 5.341 05/29/14 -0.063 0.306 1386 125 -2.390 3.053 -0.395 3.195 5.451 12.420 -0.707 3.716 06/11/14 -0.573 0.435 1165 171 3.545 4.987 -3.296 5.943 -9.067 23.690 -0.360 7.710 06/25/14 -0.455 0.344 3.0 3.0 0.2 0.5 1239 169 -8.319 4.491 -0.375 4.022 10.150 20.000 2.352 5.477 07/16/14 -0.182 0.324 1093 179 -6.127 5.780 4.977 5.315 -8.809 22.370 -3.194 6.001 07130/14 -0.122 0.246 1306 119 -3.407 3.643 1.052 3.568 -4.454 16.520 -3.305 2.885 08/13/14 -0.333 0.312 1336 121 -2.910 2.864 0.069 3.037 1.053 17.110 0.911 4.192 08/26/14 0.162 0.323 1297 151 -0.596 4.089 1.261 4.534 -7.438 25.800 2.085 8.779 09/03/14 -0.018 0.326 1246 118 -1.789 3.754 0.202 4.106 12.820 26.030 -1.668 4.848 09/15/14 -0.743 0.393 3.5 3.8 1.2 1.2 1301 126 -4.702 3.101 1.110 2.775 -0.647 14.530 -2.637 4.051 10/07/14 -0.410 0.178 1275 164 -6.601 2.025 -0.514 1.859 0.725 9.549 0.209 2.864 10/22/14 -0.188 0.237 1250 112 -5.349 3.437 -0.028 3.318 8.716 24.040 -1.078 6.102 11/19/14 -0.236 0.274 1367 128 2.415 2.958 2.792 3.098 0.785 25.250 -2.680 5.669 12/08/14 -0.421 0.458 8.0 5.2 0.3 1.0 1241 146 -1.886 4.012 -2.994 3.945 -13.150 25.320 0.898 7.576 3-17

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE8 GOAT MILK Goat Milk samples we[e not available during 2014. See discussion inSection 4.5 3-18

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 9 PASTURE GRASS / HAY (pCi/g wet wt.)

Location 21 COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60

(+1-) (+/-) (+1-) (+/-)

01/23/14 -0.128 0.100 9.456 0.511 -0.019 0.113 0.004 0.011 0.001 0.011 -0.008 0.027 0.000 0.015 02/20/14 0.083 0.127 10.840 0.686 0.059 0.110 0.000 0.014 -0.008 0.014 0.001 0.033 0.036 0.022 03/11/14 0.107 0.156 12.630 0.827 0.016 -0.160 -0.003 0.019 0.001 0.017 -0.020 0.048 0.021 0.029 04/23/14 0.042 0.129 10.990 0.763 -0.115 0.150 0.003 0.015 -0.011 0.015 -0.018 0.041 0.009 0.019 05/14/14 0.260 0.142 6.692 0.504 -0.036 0.094 -0.001 0.010 -0.002 0.010 0.010 0.026 0.003 0.012 05/29/14 0.207 0.114 5.543 0.512 -0.046 0.106 0.003 0.013 -0.008 0.013 0.019 0.029 0.024 0.013 06/11/14 0.188 0.187 5.830 0.539 -0.031 0.173 0.004 0.015 -0.016 0.017 -0.005 0.037 0.006 0.015 06/24/14 0.414 0.243 5.996 0.637 0.029 0.160 -0.006 0.017 0.001 0.018 -0.058 0.040 0.003 0.018 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131

(+1-) (+/-) (+/-)

01/23/14 -0.025 0.028 0.007 0.011 0.005 0.020 -0.011 0.013 0.028 0.089 0.011 0.028 0.012 0.035 02/20/14 -0.025 0.041 -0.003 0.014 0.002 0.027 -0.001 0.013 0.053 0.142 -0.011 0.036 0.005 0.019 03/11/14 -0.055 0.051 0.009 0.020 -0.022 0.033 0.001 0.018 -0.191 0.146 -0.008 0.045 -0.013 0.028 04/23/14 -0.009 0.042 0.004 0.014 -0.021 0.028 0.002 0.017 0.012 0.154 0.035 0.039 0.007 0.029 05/14/14 -0.034 0.029 -0.001 0.011 0.000 0.018 -0.003 0.011 -0.056 0.103 0.018 0.029 0.002 0.016 05/29/14 0.007 0.031 0.000 0.012 0.005 0.020 -0.004 0.011 -0.096 0.108 -0.039 0.034 0.000 0.018 06/11/14 0.012 0.039 0.017 0.017 -0.018 0.031 0.012 0.022 0.168 0.172 -0.013 0.051 0.019 0.033 06/24/14 -0.011 0.046 0.011 0.019 0.012 0.030 -0.001 0.018 -0.081 0.155 -0.017 0.049 -0.001 0.033 Cs-1 34 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-) (+1-)

01/23/14 0.003 0.012 0.000 0.011 -0.017 0.079 -0.010 0.019 -0.028 0.022 0.012 0.074 -0.003 0.043 02/20/14 -0.003 0.015 -0.011 0.015 0.006 0.058 0.006 0.015 -0.005 0.020 0.059 0.082 0.012 0.064 03/11/14 -0.019 0.018 -0.008 0.017 0.008 0.088 0.001 0.025 0.005 0.026 0.023 0.102 0.051 0.074 04/23/14 -0.015 0.017 -0.003 0.016 0.009 0.073 0.001 0.018 0.002 0.026 -0.016 0.106 0.004 0.062 05/14/14 -0.002 0.013 0.001 0.011 0.041 0.045 0.005 0.014 -0.001 0.018 -0.001 0.070 0.057 0.057 05/29/14 -0.020 0.012 0.006 0.012 -0.038 0.048 0.003 0.012 -0.005 0.020 0.049 0.079 0.041 0.046 06/11/14 0.035 0.022 0.014 0.017 -0.037 0.084 0.001 0.016 0.022 0.035 -0.126 0.139 -0.020 0.065 06/24/14 0.011 0.021 0.005 0.019 -0.088 0.084 0.009 0.023 0.005 0.032 0.049 0.128 0.073 0.067 3-19

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 9 PASTURE GRASS / HAY (pCi/g wet wt.)

Location 24C COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60

(+/-) (+/-)

01/23/14 0.585 0.209 6.884 0.505 0.016 0.115 0.002 0.011 0.006 0.011 -0.010 0.027 -0.013 0.011 02/19/14 0.243 0.285 7.898 0.668 -0.013 0.186 -0.004 0.019 0.010 0.018 0.020 0.040 -0.007 0.021 03/11/14 0.168 0.154 6.224 0.489 -0.181 0.168 0.009 0.016 -0.008 0.015 -0.011 0.032 0.010 0.017 04/23/14 -0.165 0.151 9.131 0.888 -0.039 0.166 -0.006 0.020 0.017 0.021 0.004 0.052 0.008 0.020 05/14/14 0.385 0.182 6.680 0.531 0.014 0.116 0.012 0.012 -0.003 0.013 -0.007 0.029 0.000 0.014 05/29/14 0.302 0.206 4.583 0.615 -0.019 0.125 -0.001 0.015 0.008 0.016 -0.008 0.028 0.001 0.012 06/11/14 0.266 0.202 4.308 0.687 -0.097 0.186 0.008 0.019 0.009 0.018 -0.032 0.040 0.002 0.020 06/24/14 0.291 0.179 6.239 0.657 -0.023 0.202 0.001 0.017 -0.005 0.017 -0.016 0.038 -0.003 0.016 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 01/23/14 0.016 0.024 -0.003 0.012 -0.001 0.021 0.000 0.012 0.072 0.092 0.020 0.029 -0.013 0.035 02/19/14 -0.029 0.040 0.009 0.018 0.017 0.032 -0.011 0.020 0.109 0.174 0.002 0.048 0.006 0.032 03/11/14 -0.059 0.034 0.007 0.016 -0.001 0.029 0.002 0.018 0.025 0.148 -0.039 0.044 0.005 0.033 04/23/14 -0.052 0.055 0.002 0.021 -0.008 0.038 -0.012 0.020 0.007 0.183 0.020 0.051 0.000 0.031 05/14/14 -0.048 0.032 -0.003 0.013 0.003 0.025 0.010 0.014 0.015 0.119 -0.023 0.036 -0.002 0.023 05/29/14 -0.002 0.038 0.001 0.015 -0.025 0.026 -0.004 0.017 0.056 0.123 0.033 0.037 -0.025 0.021 06/11/14 -0.066 0.047 -0.004 0.022 -0.030 0.036 0.001 0.022 0.011 0.191 0.026 0.061 0.000 0.036 06/24/14 -0.034 0.037 0.000 0.020 -0.003 0.031 0.002 0.020 -0.069 0.176 -0.010 0.0-54 -0.004 0.035 Cs-134 Cs- 137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-)

01/23/14 0.003 0.011 0.060 0.037 0.007 0.081 -0.008 0.021 -0.033 0.027 -0.032 0.076 0.017 0.067 02/19/14 -0.009 0.023 0.023 0.042 0.023 0.087 0.002 0.022 0.000 0.036 0.021 0.140 0.068 0.123 03/11/14 -0.059 0.018 0.059 0.035 0.034 0.087 -0.006 0.021 0.012 0.031 0.009 0.120 0.028 0.070 04/23/14 -0.002 0.021 -0.002 0.019 0.032 0.099 0.002 0.029 -0.006 0.022 -0.044 0.086 -0.093 0.087 05/14/14 -0.022 0.014 0.004 0.015 -0.025 0.058 -0.011 0.017 0.005 0.020 -0.034 0.090 0.028 0.052 05/29/14 -0.002 0.013 -0.015 0.015 -0.010 0.061 -0.008 0.019 -0.012 0.021 -0.014 0.078 -0.012 0.053 06/11/14 -0.003 0.023 0.031 0.020 -0.008 0.100 0.014 0.029 0.029 0.031 -0.024 0.131 0.082 0.076 06/24/14 0.016 0.020 -0.009 0.018 0.003 0.092 -0.012 0.021 -0.040 0.040 0.073 0.155 0.010 0.071 NOTE: ON JULY 1ST, THE REQUIREMENT FOR GOAT MILK WAS DROPPED; THEREFORE SUBSTITUTE PASTURE GRASS SAMPLING IS NO LONGER REQUIRED 3-20

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 10 WELL WATER (pCi/I)

COLLECTION LOCATION DATE H-3 Be-7 K-40 Cr-51 Mn-54 Co-58(+--) Fe-59(+--) Co-60

(+1-) (+/-) (+I-) (+/-) (+1-)

71 03/19/14 825 1020 3.8 19.7 -9.4 31.6 -5.4 25.5 0.5 2.2 -0.7 2.2 1.9 4.6 2.0 2.2 06/23/14 542 871 9.8 32.9 20.0 36.4 9.0 39.5 0.0 2.4 -1.2 3.3 -0.2 6.2 5.8 2.7 09/16/14 401 904 -0.5 26.2 25.4 51.8 -4.8 30.6 0.0 3.1 -0.7 2.9 -1.6 6.1 2.1 3.1 11/12/14 -138 841 5.0 42.1 60.4 76.0 7.1 45.4 3.1 3.9 -3.3 4.6 -1.2 8.9 -0.6 4.9 72 03/19/14 396 961 7.2 22.3 -8.4 42.0 20.7 27.4 -2.3 2.5 0.7 2.3 0.1 4.9 2.5 2.2 06/23/14 -308 730 -2.5 37.2 -15.4 54.3 -44.4 44.7 0.5 3.9 -3.2 4.1 -2.4 8.6 -2.9 3.6 09/16/14 400 903 -5.3 34.2 41.6 74.8 8.7 41.9 -1.1 3.4 0.0 4.0 -1.1 8.1 1.9 3.8 11/12/14 654 945 -2.4 43.3 -31.2 58.9 31.2 51.0 -2.2 4.5 -1.3 5.0 -2.0 9.0 0.9 4.6 76 03/14/14 976 1030 0.8 20.7 3.5 28.6 -3.5 25.2 1.6 2.0 -2.6 2.4 2.3 4.1 -0.5 2.4 06/12/14 -178 804 0.4 20.5 3.4 45.6 6.6 23.9 0.7 1.9 0.7 2.1 0.9 4.3 1.0 2.0 09/11/14 407 906 11.6 31.7 1.1 47.5 9.2 36.8 0.0 3.1 0.8 3.7 -1.2 7.2 0.6 3.8 11/12/14 37 844 -9.1 34.3 44.1 89.3 16.8 39.3 2.6 4.1 -4.0 4.0 -4.7 6.6 0.5 3.8 77 03/14/14 402 959 -8.2 33.8 17.5 59.7 12.6 41.7 -0.9 3.1 -2.6 3.5 3.9 - .9. 5.7 4.3 06/12/14 -132 811 -7.9 23.8 13.9 39.4 -7.1 30.0 -0.2 2.4 -0.5 2.5 0.1 5.6 -0.5 2.1 09/11/14 -242 810 -14.8 28.7 21.8 45.5 3.0 34.3 0.4 3.0 1.0 3.4 0.2 6.6 -0.2 2.6 11/12/14 -650 756 -6.1 12.4 25.0 35.6 -1.0 13.7 -2.3 1.5 -1.8 1.6 1.5 3.3 0.2 1.5 78 03/14/14 -32 890 -6.2 27.8 -12.4 37.2 -26.9 31.6 1.0 2.7 -1.8 2.8 1.5 5.7 -0.9 2.8 06/11/14 195 851 8.6 26.5 3.4 40.7 -2.8 30.0 1.7 2.6 -0.1 2.7 -1.8 6.1 0.4 2.4 09/11/14 637 938 12.6 27.7 7.8 44.1 9.5 31.0 1.9 2.9 0.8 3.0 3.8 4.9 0.3 3.4 11/12/14 -12 847 2.3 11.3 -7.6 20.4 -9.5 12.9 -0.8 1.2 -0.6 1.3 0.3 2.8 2.2 1.3 79 03/18/14 0 925 31.1 24.3 35.9 63.5 -21.1 27.3 -0.8 2.7 0.7 2.7 -4.1 6.7 1.6 2.8 06/23/14 -297 737 -28.9 34.0 21.4 47.4 17.9 33.6 1.0 3.5 1.6 3.3 -1.4 6.6 4.6 3.5 09/16/14 248 882 -21.8 35.6 52.0 87.8 41.9 44.3 -0.7 4.8 -0.6 4.9 3.8 10.3 -0.3 5.0 11/12/14 37 855 13.2 24.4 8.9 46.8 -15.3 28.1 -2.0 2.8 0.6 2.8 2.0 6.0 1.8 2.5 81 03/18/14 204 960 9.3 20.8 -9.7 33.6 -14.5 26.3 -1.1 1.9 0.5 2.2 3.0 4.7 -0.5 2.4 06/23/14 671 890 23.4 38.3 25.8 79.5 -34.0 47.0 -0.6 3.7 -1.3 3.7 2.2 7.1 0.8 4.0 09/16/14 64 855 -2.3 25.4 -45.7 32.7 -26.7 28.7 -1.5 2.8 -0.6 2.8 -0.2 5.4 -1.3 2.5 11/12/14 -478 800 -7.8 32.1 -2.0 53.6 -0.5 34.9 1.4 3.2 -1.4 3.7 10.1 6.9 -1.3 3.9 82 03/19/14 75 902 -13.3 25.8 65.7 41.3 6.8 31.6 -0.9 2.3 -0.8 2.7 -1.5 5.0 0.4 2.2 06/23/14 810 901 -31.4 39.1 3.9 70.8 16.5 48.2 4.4 4.0 -0.1 4.2 2.7 7.3 0.0 3.6 09/16/14 -197 816 -10.3 32.7 70.9 65.3 -18.2 36.0 -3.1 3.2 0.7 3.4 -3.5 6.5 1.0 2.9 11/12/14 -63 852 -23.1 36.8 -69.2 63.4 -12.0 38.6 0.2 4.1 -1.2 4.8 -3.0 8.5 0.2 5.2 83 03/18/14 85 939 0.2 19.2 4.4 35.3 -3.9 23.0 -0.1 2.0 -0.9 2.1 1.4 4.8 0.2 1.9 06/23/14 116 808 -17.8 35.6 -23.0 59.4 -11.5 43.9 -3.0 3.8 -1.4 4.0 -0.3 7.7 -1.5 4.0 09/16/14 369 899 6.2 30.7 68.7 51.1 -12.7 36.0 0.4 3.6 -2.5 3.9 -0.6 6.7 0.5 3.4 11/12/14 461 907 -0.2 41.2 60.5 57.3 50.2 48.5 2.0 4.3 0.7 4.8 1.2 8.8 -2.3 4.5 3-21

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 10 WELL WATER (pCi/I)

COLLECTION LOCATION DATE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-13 1 Cs-1i34

(+/-) (+/-) (+/-)

71 03/19/14 1.9 4.4 1.4 2.3 -0.8 3.8 -1.0 2.7 -2.2 19.1 -0.3 6.1 -2.1 7.3 1.1 2.1 06/23/14 4.5 6.1 -0.4 3.2 2.0 5.5 0.6 3.3 -36.4 30.4 3.3 9.9 2.4 7.4 -3.4 3.7 09/16/14 1.7 4.8 0.2 3.0 -2.4 4.8 -1.0 3.1 -4.9 25.3 1.8 8.0 -3.6 5.6 1.6 3.0 11/12/14 1.1 10.7 -2.0 4.7 -8.4 8.3 -2.0 4.4 41.6 39.9 10.3 12.1 -2.8 7.8 -0.2 4.7 72 03/19/14 -4.3 5.7 1.5 2.4 0.6 4.1 -1.5 2.9 -7.0 19.4 -6.5 6.4 1.4 7.8 1.6 2.2 06/23/14 -6.4 8.0 3.2 4.0 4.8 7.1 -0.1 4.9 11.4 41.7 2.1 12.6 -2.4 8.5 0.2 4.9 09/16/14 -10.4 8.6 2.0 3.7 -3.2 7.3 -4.7 4.8 -1.2 32.0 2.7 11.2 2.2 8.1 0.5 3.9 11/12/14 12.8 12.4 5.0 5.4 -4.2 9.4 1.4 5.3 35.2 47.9 -9.2 14.5 -6.2 9.5 15.5 7.0 76 03/14/14 -2.5 4.9 0.1 2.2 -0.8 4.1 0.5 2.6 2.2 20.8 -2.3 5.7 2.3 5.3 -1.1 2.7 06/12/14 -3.7 4.8 -1.7 2.3 -2.6 3.7 0.0 2.7 -3.8 20.1 -1.9 6.2 0.0 5.8 -9.6 2.6 09/11/14 1.6 7.7 2.1 3.4 10.9 6.5 -3.1 4.5 -17.4 33.7 -3.7 9.2 -8.4 9.5 -0.9 4.0 11/12/14 -11.3 9.2 4.1 4.2 1.1 6.7 -0.7 4.0 9.9 34.3 -0.1 10.3 -0.3 7.4 -0.2 4.3 77 03/14/14 -1.7 8.0 4.3 3.8 -2.0 5.6 -0.2 4.0 8.0 31.0 -5.4 10.2 -7.0 9.5 -3.0 4.0 06/12/14 -0.1 5.7 3.1 2.8 1.4 4.6 4.2 3.0 1.1 22.5 5.2 7.7 1.6..,.7.2 -0.8 2.8 09/11/14 -0.7 6.3 3.0 4.0 2.8 5.7 -1.1 3.8 16.5 26.6 -3.7 8.9 -0.9 9.0 .0.1 3.4 11/12/14 -0.1 3.7 2.8 1.9 0.1 2.7 -0.3 1.6 2.8 13.3 1.2 3.8 1.3 2.9 0.9 1.5 78 03/14/14 -3.3 5.8 0.8 2.7 2.9 4.7 2.6 3.2 0.2 24.6 -1.8 7.9 -4.9 7.4 -7.4 3.3 06/11/14 -7.7 6.0 -1.4 2.7 0.3 4.9 -4.2 3.3 -7.8 24.2 8.0 7.1 -2.0 7.8 -1.7 3.1 09/11/14 -10.0 6.9 1.0 3.2 -2.6 4.5 0.4 3.4 9.3 26.0 -3.0 7.1 -0.2 7.6 -0.7 3.6 11/12/14 1.1 3.0 1.4 1.4 1.8 2.3 -0.6 1.4 3.7 11.4 1.1 3.3 -0.2 2.5 0.2 1.5 79 03/18/14 -5.9 6.3 0.2 2.8 -2.5 5.5 -0.9 3.4 6.4 24.9 0.2 6.6 0.0 7.9 -1.3 2.9 06/23/14 -3.1 7.8 5.1 3.7 -0.3 6.4 -0.4 4.2 7.6 32.8 -0.3 10.8 -3.0 7.6 -2.1 4.1 09/16/14 -13.6 12.0 -1.8 4.9 -2.1 7.3 -1.4 5.2 31.4 42.3 -3.8 12.1 2.5 8.9 -0.3 5.5 11/12/14 -1.8 6.2 3.6 3.0 0.7 4.8 -0.2 3.2 -21.2 24.6 -2.7 7.4 -3.6 5.2 3.0 3.6 81 03/18/14 -6.0 4.5 0.5 2.1 3.7 3.9 -2.4 2.8 -0.9 20.1 -3.0 6.3 -6.1 7.6 -0.2 2.3 06/23/14 -9.0 9.7 -0.9 4.1 -6.0 7.1 -5.5 5.0 24.7 36.5 0.7 11.4 -0.6 8.6 -1.7 4.4 09/16/14 -1.7 5.8 3.6 3.1 8.6 4.7 -3.3 3.1 0.0 27.3 1.8 8.2 0.5 6.1 -1.1 3.0 11/12/14 5.8 8.4 4.6 4.0 1.1 6.0 -0.4 4.0 -30.3 32.4 -3.4 9.9 -3.3 6.8 0.7 4.0 82 03/19/14 4.1 5.5 5.0 2.8 -1.8 4.5 3.0 3.3 -1.8 22.4 -7.4 7.7 5.4 8.8 6.8 3.1 06/23/14 38.1 10.6 13.7 4.8 3.6 7.8 3.8 4.7 50.0 40.9 -0.6 12.8 4.8 9.6 47.0 7.0 09/16/14 -0.2 6.5 1.1 4.0 -6.0 5.9 1.9 3.7 5.2 28.7 -4.1 10.0 2.3 6.9 0.2 3.4 11/12/14 8.3 9.9 1.4 5.5 2.6 8.3 -1.6 4.8 9.6 37.5 3.7 12.6 2.5 7.2 0.7 4.9 83 03/18/14 0.6 4.5 2.9 2.4 0.9 3.2 -2.5 2.6 -0.8 16.1 4.0 5.6 -0.1 6.8 0.1 2.0 06/23/14 5.1 8.1 -0.2 4.7 1.3 7.5 -0.6 4.2 -11.8 37.7 -5.5 13.0 5.2 8.3 1.5 4.3 09/16/14 0.2 8.8 2.0 3.8 0.2 5.9 0.1 4.1 2.9 29.3 -0.4 10.6 1.3 7.2 0.5 3.7 11/12/14 24.6 13.4 2.4 5.3 3.2 9.1 1.0 5.4 -0.5 46.4 0.8 14.0 -5.7 9.0 30.5 7.1 3-22

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 10 WELL WATER (pCi/I)

COLLECTION LOCATION DATE Cs-137 Ba-140 La-140

(+/-) Ac-228

(*/-) -+- (+1-)

71 03/19/14 1.4 2.2 -3.2 15.6 0.4 5.1 0.1 8.4 06/23/14 -3.9 3.5 -0.9 17.6 -1.4 4.6 7.6 9.7 09/16/14 0.1 3.1 5.4 16.4 0.6 4.8 -2.1 11.0 11/12/14 0.1 4.7 4.7 23.8 -4.2 7.5 13.7 16.6 72 03/19/14 -0.9 2.2 -5.9 15.9 -2.3 5.7 -0.9 9.0 06/23/14 0.6 4.0 5.0 22.0 1.4 7.6 -8.4 14.0 09/16114 -1.2 4.0 -8.5 24.0 1.8 6.1 4.8 14.3 11/12/14 -1.9 5.5 -13.3 25.3 -8.6 7.4 7.6 18.6 76 03/14/14 0.7 2.2 9.8 12.7 -1.4 4.2 -5.4 9.1 06/12/14 1.0 2.1 1.1 13.4 -1.0 4.0 -3.7 8.2 09/11/14 1.1 3.7 0.6 23.9 -1.3 7.7 10.6 14.4 11/12/14 -4.6 4.2 -3.7 19.8 0.6 6.5 6.0 17.9 77 03/14/14 -0.5 3.5 5.1 20.4 -3.7 7.2 -1.6 13.2 06/12/14 -0.3 2.5 -20.8 16.0 0.5 5.2 -0.5 9.4 09/11/14 0.8 2.9 15.1 18.6 1.1 6.0 0.8 11.4 11/12/14 -0.9 1.5 -7.2 7.5 -0.5 2.6 -0.4 6.5 78 03/14/14 -1.8 2.9 -1.2 16.8 -4.0 4.8 1.2 10.0 06/11/14 -0.4 3.0 -15.0 19.5 1.0 7.2 -4.4 9.7 09/11/14 1.0 3.1 13.6 17.1 5.1 8.0 -1.9 11.5 11/12/14 -0.7 1.3 -0.3 6.9 0.7 2.3 1.6 5.3 79 03/18/14 0.7 2.7 16.1 19.2 1.7 6.0 -11.9 10.5 06/23/14 -0.5 3.5 3.9 18.0 -0.3 6.0 3.5 12.6 09/16/14 3.9 5.3 -5.7 22.6 3.1 7.6 -10.8 16.5 11/12114 0.9 3.1 0.0 15.2 0.2 4.0 23.8 14.2 81 03/18/14 1.1 2.2 1.2 15.3 -0.8 4.5 4.7 11.9 06/23/14 -0.5 3.9 3.7 22.9 1.1 5.4 -2.9 16.8 09/16/14 4.0 3.2 0.2 14.9 3.3 4.6 3.3 12.3 11/12/14 0.2 3.7 11.8 17.9 -1.5 5.6 -2.1 12.1 82 03/19/14 1.6 2.7 -9.1 18.5 -0.2 4.6 1.1 9.0 06/23/14 5.2 4.1 -20.2 22.5 0.6 5.7 3.8 14.5 09/16/14 1.1 3.8 6.5 17.1 0.8 5.3 2.9 12.2 11/12/14 1.4 4.4 4.0 20.3 -3.9 7.3 -6.0 14.6 83 03/18/14 0.0 2.1 0.7 15.8 -0.4 4.4 -4.9 7.5 06/23/14 -1.4 4.5 -2.7 20.5 -3.0 7.2 -6.6 16.1 09/16/14 -4.3 3.8 10.9 17.2 3.6 5.8 -10.8 13.5 11/12/14 8.0 5.2 -3.1 23.2 3.0 6.6 11.6 17.3 3-23

.1 . -

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 11 RESERVOIR WATER (pCi/1)

Reservoir water was not sampled in 2014. See discussion in Section 4.11.

3-24

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 12 FRUITS & VEGETABLES (pCi/g wet wt.)

LOCATION 25 COLLECTION DATE" Type Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60

(+/-) (*/-) (+/-) (+/-) (+1-) (+/-) (+1-)

07/24/14 Greens 0.106 0.096 4.140 0.486 -0.108 0.104 0.006 0.009 -0.004 0.011 -0.013 0.024 0.005 0.012 07/24/14 Blueberries -0.003 0.092 0.789 0.200 -0.039 0.093 0.004 0.010 -0.003 0.010 0.006 0.021 0.002 0.010 10/20/14 Greens 0.244 0.291 4.269 0.573 -0.108 0.141 -0.002 0.016 0.008 0.014 -0.021 0.034 0.005 0.015 10/20/14 Apples 0.092 0.136 1.293 0.367 0.061 0.135 0.011 0.014 0.011 0.015 -0.013 0.034 -0.006 0.013 COLLECTION DATE Type Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 3b-125 1-131

(+/-) (+/-) (+0-) (+1-) (+/-) (+/-) (+1-)

07/24/14 Greens -0.021 0.028 -0.001 0.011 0.003 0.019 -0.009 0.012 -0.031 0.104 0.001 0.032 -0.006 0.019 07/24/14 Blueberries 0.000 0.021 0.000 0.011 -0.007 0.017 0.001 0.012 0.074 0.086 0.004 0.027 0.014 0.017 10/20/14 Greens -0.050 0.042 0.010 0.015 0.017 0.026 -0.004 0.017 -0.117 0.132 -0.001 0.044 -0.019 0.034 10/20/14 Apples -0.023 0.033 0.007 0.015 0.021 0.026 -0.002 0.017 -0.029 0.136 0.012 0.040 0.000 0.033 COLLECTION DATE Type Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-) (+/-) (+/-) (+/-) (+/-) (+/-) (+/-)

07/24/14 Greens -0.019 0.012 -0.004 0.012 -0.021 0.059 -0.001 0.014 -0.002 0.020 -0.008 0.082 -0.020 0.046 07/24/14 Blueberries 0.003 0.011 -0.002 0.011 -0.004 0.045 0.001 0.014 0.007 0.016 -0.002 0.065 -0.005 0.037 10/20/14 Greens 0.005 0.016 -0.012 0.013 0.135 0.087 0.005 0.022 -0.004 0.028 -0.035 0.103 -0.039 0.056 10/20/14 Apples -0.013 0.017 0.011 0.017 -0.017 0.078 -0.019 0.029 0.023 0.023 -0.033 0.083 -0.040 0.056 3-25

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 12 FRUITS & VEGETABLES (pCi/g wet wt.)

LOCATION 26C COLLECTION DATE Type Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60 07/24/14 Greens -0.031 0.108 4.776 0.515 0.066 0.105 -0.002 0.012 -0.004 0.012 0.001 0.028 0.001 0.010 07/24/14 Blueberries 0.060 0.084 0.568 0.251 -0.019 0.084 0.005 0.009 0.003 0.009 0.011 0.017 -0.005 0.010 10/20/14 Greens 0.197 0.130 4.715 0.480 -0.036 0.109 -0.007 0.010 0.000 0.012 0.029 0.026 -0.009 0.009 10/20/14 Apples 0.086 0.091 0.977 0.299 0.009 0.106 -0.003 0.011 -0.002 0.010 0.004 0.026 -0.004 0.013 COLLECTION DATE Type Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131

(+1-) (*/-)

07/24/14 Greens -0.005 0.031 -0.006 0.012 -0.001 0.021 -0.003 0.013 -0.018 0.113 -0.012 0.032 -0.002 0.020 07/24/14 Blueberries 0.009 0.020 -0.001 0.009 0.000 0.015 0.004 0.010 -0.020 0.083 0.030 0.027 0.001 0.014 10/20/14 Greens -0.027 0.030 0.001 0.012 0.010 0.018 0.000 0.013 0.058 0.102 0.001 0.031 0.009 0.024 10/20/14 Apples -0.022 0.028 0.002 0.012 -0.002 0.020 -0.005 0.013 0.088 0.114 0.000 0.026 -0.009 0.023 COLLECTION DATE Type Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-)

07/24/14 Greens -0.008 0.011 0.003 0.012 0.004 0.062 -0.015 0.014 -0.014 0.019 -0.013 0.076 0.013 0.048 07/24/14 Blueberries -0.012 0.009 0.001 0.009 0.011 0.042 -0.005 0.012 -0.002 0.015 -0.020 0.065 0.050 0.038 10/20/14 Greens 0.000 0.010 -0.015 0.012 0.005 0.062 -0.006 0.023 -0.002 0.020 -0.006 0.077 0.016 0.044 10/20/14 Apples 0.012 0.011 -0.011 0.013 0.099 0.063 0.007 0.017 -0.004 0.014 0.013 0.053 -0.021 0.042 3-26

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 13 BROADLEAF VEGETATION (pCiig wet wt.)

LOCATION 1 COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60

(+1-) (+/-) (+/-) (+0-) (+1-) (+/-) (+1-)

07/15/14 0.555 0.189 2.566 0.440 -0.094 0.148 -0.002 0.013 0.003 0.013 -0.001 0.029 -0.011 0.014 10/15/14 1.762 0.278 2.870 0.371 0.025 0.126 -0.004 0.013 0.002 0.011 0.012 0.020 0.007 0.010 Zn-65 Nb-95 Zr-95 Ru-1 03 Ru-106 Sb-125 1-131

(+/-) (+1-) (+1-) (+1-) (+1-) (+1-) (+1-)

07/15/14 -0.001 0.035 0.005 0.015 0.006 0.029 -0.016 0.017 -0.132 0.130 0.039 0.045 -0.014 0.028 10/15/14 0.000 0.027 -0.002 0.011 0.018 0.022 -0.004 0.013 0.033 0.105 0.030 0.032 0.009 0.023 Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-) (+/-) (+1-) (+1-) (+--)

07/15/14 -0.014 0.016 -0.017 0.017 0.029 0.076 -0.022 0.026 -0.014 0.029 -0.100 0.113 0.076 0.056 10/15/14 -0.002 0.013 0.008 0.013 -0.036 0.054 0.003 0.016 0.007 0.029 -0.025 0.121 0.028 0.075 LOCATION 10 COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60

(+/-) (+/-) (+/-) (+/-) (+1-)

07/15/14 0.406 0.206 4.019 0.492 0.108 0.112 0.001 0.016 0.004 0.015 0.006 0.028 0.002 0.013 10/15/14 0.705 0.226 3.266 0.453 -0.054 0.132 0.000 0.015 0.004 0.015 -0.014 0.031 0.008 0.013 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131

(+/-) (+/-) (+/-) (+001 (+/-) (+/-)

07/15/14 -0.005 0.033 0.000 0.015 0.009 0.023 -0.008 0.015 0.032 0.116 0.018 0.039 0.011 0.025 10/15/14 -0.030 0.034 -0.001 0.013 -0.009 0.025 0.006 0.015 0.128 0.139 -0.022 0.035 -0.004 0.026 Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-) (+/-) (+/-) (+/-) (+/-) (+/-)

07/15/14 -0.016 0.015 -0.003 0.015 0.015 0.071 0.000 0.018 0.015 0.020 -0.005 0.077 0.037 0.054 10/15/14 -0.033 0.015 0.007 0.014 -0.011 0.070 -0.003 0.019 0.012 0.029 -0.007 0.111 0.073 0.059 3-27

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 13 BROADLEAF VEGETATION (pCi/g wet wt.)

LOCATION 17 COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60 07/15/14 0.406 0.285 2.702 0.556 0.083 0.131 -0.012 0.014 0.010 0.014 -0.043 0.034 0.001 0.014 10/15/14 0.881 0.227 3.615 0.542 -0.058 0.127 0.002 0.015 -0.001 0.016 0.025 0.035 0.009 0.016 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 07/15/14 -0.007 0.032 0.000 0.013 -0.007 0.022 -0.007 0.014 -0.058 0.121 -0.007 0.036 0.002 0.026 10/15/14 -0.033 0.034 0.002 0.016 -0.006 0.026 -0.010 0.014 0.011 0.131 -0.016 0.036 -0.013 0.026 Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228 07/15/14 0.003 0.014 0.007 0.014 0.005 0.068 0.015 0.023 -0.004 0.024 0.052 0.085 0.143 0.108 10/15/14 0.002 0.013 0.011 0.016 -0.025 0.065 -0.002 0.016 -0.001 0.018 -0.023 0.070 0.054 0.065 LOCATION 26C COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60 07/15/14 0.664 0.193 3.417 0.533 -0.114 0.140 -0.006 0.015 0.005 0.015 0.005 0.035 0.009 0G015 10/15/14 1.391 0.176 3.942 0.394 0.014 0.102 -0.001 0.010 -0.005 0.010 0.001 0.021 0.002 0.011 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 07/15/14 -0.059 0.038 -0.011 0.015 0.008 0.024 -0.006 0.014 0.048 0.113 0.010 0.037 0.000 0.027 10/15/14 -0.003 0.023 0.003 0.010 0.015 0.017 0.005 0.010 0.028 0.092 0.008 0.026 -0.018 0.020 Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228 07/15/14 0.000 0.016 0.004 0.015 0.051 0.069 0.001 0.017 -0.014 0.023 -0.031 0.087 0.096 0.057 10/15/14 -0.008 0.012 0.006 0.012 0.037 0.044 -0.001 0.013 -0.004 0.019 -0.028 0.073 0.026 0.124 3-28

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 14 SEA WATER (pCi/I)

LOCATION 32 COLLECTION DATE H-3 Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59

(+I.-)

01/27/14 209 122 3.8 19.2 201 56 -4.8 23.1 1.1 2.0 -1.1 2.3 3.1 4.8 02/24114 801 201 -4.2 24.6 325 67 0.7 27.4 -1.6 2.7 -0.3 2.6 -0.9 6.5 03/31/14 1170 171 -11.7 24.6 274 69 3.7 25.7 -1.7 2.8 -0.7 3.0 2.4 5.4 04/28/14 539 117 13.4 26.5 409 66 -20.6 32.3 -2.8 3.1 1.0 3.1 -2.6 6.5 05/27/14 33 124 -3.4 33.0 276 101 -0.1 36.3 0.9 4.1 -0.8 4.0 1.9 7.4 06/24/14 525 148 -23.2 29.3 289 90 -3.6 28.2 -2.3 3.3 0.3 3.4 2.1 7.1 07/29/14 960 154 38.9 33.9 242 79 -13.7 36.9 0.6 2.6 2.7 3.1 0.5 6.7 08/26/14 745 138 4.9 18.3 264 46 14.2 22.4 2.1 1.7 -0.6 2.0 -1.6 4.2 09/30/14 331 132 13.1 17.2 273 72 5.8 22.7 0.3 1.8 -0.8 2.1 4.4 4.7 10/28/14 874 160 4.0 22.6 291 63 0.2 27.6 -1.2 2.3 0.0 2.2 0.6 4.8 11/25114 662 151 13.3 27.2 312 59 1.3 32.2 2.0 2.5 1.4 2.6 -3.3 5.0 12/30/14 209 109 21.5 31.2 266 79 21.7 35.0 -0.5 3.0 1.1 3.4 5.8 7.2 Co-60 Zn-65 Nb-95 Zr-95 Ru-1 03 Ru-1 06 Sb-125 01/27/14 0.6 2.0 -3.2 4.7 0.7 2.3 0.2 4.1 -0.5 2.5 10.6 17.4 4.9 5.4 02/24/14 2.5 2.9 -4.2 6.8 1.6 3.0 -3.5 4.9 -2.3 3.1 10.6 23.7 -4.2 8.5 03/31/14 0.9 3.2 -4.3 6.3 0.1 2.8 -2.1 4.7 -1.2 3.2 0.7 27.1 -8.1 8.0 04128/14 -1.7 3.4 -0.9 6.4 0.6 3.3 0.2 6.0 -0.2 3.7 -20.9 27.4 -2.1 8.5 05/27/14 -0.9 4.2 -12.4 9.1 0.1 4.3 -6.8 7.6 2.7 3.7 2.8 35.7 2.8 10.1 06/24/14 1.0 3.3 -10.2 7.7 1.9 2.9 3.9 5.8 -0.4 3.3 12.9 28.6 -5.9 8.5 07/29/14 13.0 4.9 2.1 7.0 4.7 3.2 0.1 5.7 -0.6 4.1 9.7 32.8 -5.6 10.4 08/26/14 0.8 1.7 -2.0 3.7 -0.5 1.9 0.8 3.5 -0.7 2.2 -0.7 16.3 -1.5 5.1 09/30/14 0.1 1.9 4.5 4.2 0.8 2.1 1.0 3.6 0.5 2.5 6.4 17.4 -1.0 5.5 10/28/14 -0.3 2.5 -6.0 5.4 -0.2 2.2 -0.5 4.0 0.1 2.9 18.4 19.7 0.4 6.2 11/25/14 0.6 2.2 -2.3 5.0 0.9 2.7 -3.1 4.9 1.1 3.3 6.4 23.5 -1.9 8.1 12/30/14 -0.6 3.4 -2.5 7.8 1.6 3.1 5.2 5.3 -1.5 3.8 -13.4 26.8 -3.7 10.2 1-131 Cs-134 Cs-137 Ba-140 La-140 Ac-228

(+/-) (+I-) (4/-) (+I-)

01/27/14 -3.7 7.6 0.4 2.0 -0.7 1.8 3.5 15.1 -4.5 4.2 -2.1 7.9 02/24/14 3.1 5.6 0.8 3.5 -0.6 2.8 6.3 15.8 1.8 4.5 11.0 11.8 03/31/14 -3.5 6.6 -1.9 3.1 -1.2 2.9 -8.4 17.2 -2.4 5.7 -1.6 10.4 04/28/14 1.7 6.4 -0.7 3.2 0.2 3.2 -1.6 16.2 -0.3 3.8 5.8 11.6 05/27/14 0.7 6.8 -2.5 4.1 -3.4 3.7 9.8 18.5 2.6 5.2 14.9 15.8 06/24/14 2.2 5.9 -3.5 3.6 -0.6 3.4 2.8 16.2 -0.6 5.5 -9.2 12.0 07/29/14 5.8 6.8 -3.3 3.5 -0.3 3.8 -9.4 17.9 -3.1 4.9 4.5 11.5 08/26/14 -0.7 6.9 -0.1 1.6 -0.8 1.9 -5.2 14.0 -1.9 3.8 -0.9 7.0 09/30/14 -2.2 7.5 1.3 1.7 0.3 1.7 3.9 13.7 -3.1 5.2 -0.7 8.4 10/28/14 -0.8 8.1 -6.7 2.5 0.6 2.2 -3.7 17.4 0.8 5.2 -2.3 8.4 11/25/14 8.7 6.4 -0.7 2.9 0.8 2.9 3.1 16.0 -3.8 3.2 -2.6 9.5 12/30/14 3.0 6.1 -6.6 3.6 -1.2 3.2 -9.9 17.1 0.5 4.9 13.8 12.6 3-29

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 14 SEA WATER (pCi/I)

LOCATION 37C COLLECTION DATE H-3 Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59

(+1-)

03/17/14 75 104 -10.2 30.3 328 89 -5.46 37.09 -0.5 3.4 0.9 3.7 8.3 7.1 06/10/14 88 102 -2.5 26.4 252 74 -8.57 32.06 -2.2 2.9 1.3 3.1 1.1 5.4 09/09/14 -19 150 -22.6 20.8 291 65 -12.76 28.35 0.2 2.2 -1.5 2.2 -0.9 5.3 12/08/14 -57 113 24.2 28.2 292 82 6.54 26.69 1.7 3.0 -2.1 3.5 0.8 7.1 CO-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 03/17/14 3.2 3.9 3.6 8.4 4.2 3.8 0.2 6.1 0.5 3.7 23.6 33.7 -5.4 10.8 06/10/14 -0.8 2.7 -8.7 5.9 4.0 3.2 -1.8 4.9 2.0 3.4 5.0 25.4 1.0 9.2 09/09/14 0.2 2.1 2.0 5.2 0.0 2.4 0.4 4.2 -0.9 2.9 -2.6 20.1 -1.5 6.9 12/08/14 3.0 3.0 -16.8 6.9 2.1 3.3 0.5 5.5 -3.8 3.5 -7.1 29.8 -3.5 8.5 1-131 Cs-134 Cs-137 Ba-140 La-140 Ac-228 03/17/14 0.2 4.7 2.5 4.3 1.2 3.7 0.7 15.1 0.9 5.0 2.3 16.0 06/10/14 -3.3 5.9 -2.8 3.2 1.3 3.0 -3.1 14.9 -1.7 5.3 -1.8 11.2 09/09/14 -8.4 8.2 2.4 2.3 -3.4 2.3 -15.2 15.4 0.5 4.7 -5.3 8.5 12/08/14 0.3 6.0 -4.4 3.2 -1.7 3.8 -3.0 16.1 -0.4 5.8 -2.6 12.4 3-30

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59

(+1-) (+/-) (+-5) 31 01/06/14 0.029 0.265 17.66 1.25 0.076 0.344 0.005 0.026 -0.005 0.031 0.071 0.077 31 03/25/14 0.011 0.291 16.99 1.35 -0.243 0.328 0.011 0.039 -0.002 0.034 -0.049 0.072 31 09/15/14 0.216 0.279 21.10 1.49 0.288 0.323 0.027 0.034 0.009 0.034 -0.015 0.070 32 06/25/14 0.112 0.156 13.97 0.60 -0.174 0.195 0.010 0.018 -0.007 0.018 -0.019 0.039 32 12/05/14 0.241 0.278 14.75 1.17 -0.193 0.315 0.013 0.029 -0.011 0.032 -0.033 0.070 33 06/06/14 0.036 0.256 14.54 1.03 0.091 0.312 -0.012 0.027 -0.007 0.028 0.007 0.067 33 10/02/14 0.122 0.296 23.20 1.25 0.070 0.393 -0.002 0.031 0.002 0.035 -0.010 0.100 34 01/24/14 0.106 0.266 15.41 1.09 0.115 0.307 0.010 0.028 0.026 0.032 -0.055 0.073 34 06/06/14 -0.043 0.230 16.07 1.23 0.004 0.232 0.004 0.025 0.000 0.026 -0.039 0.067 34 08/06/14 -0.078 0.213 21.07 1.41 0.016 0.218 0.008 0.027 0.003 0.026 -0.016 0.079 37 06/06/14 -0.720 0.257 16.08 1.18 -0.093 0.294 -0.010 0.027 0.006 0.030 -0.015 0.068 37 09/15/14 -0.074 0.226 15.54 1.27 0.051 0.263 0.007 0.027 0.002 0.028 0.030 0.068 39 06/25/14 -0.047 0.208 18.06 0.98 -0.157 0.267 0.011 0.023 -0.024 0.024 -0.064 0.059 67 06/16/14 0.390 0.277 20.23 1.33 -0.058 0.264 -0.012 0.031 -0.004 0.030 -0.036 0.076 3-31

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 31 01/06/14 -0.001 0.034 0.017 0.071 _ 0.006 0.032 0.001 0.056 0.002 0.037 0.084 0.212 31 03/25/14 0.012 0.032 -0.206 0.090 0.020 0.040 0.077 0.066 -0.013 0.035 -0.101 0.316 31 09/15/14 -0.004 0.032 0.034 0.080 0.003 0.038 -0.018 0.064 -0.014 0.034 0.165 0.296 32 06/25/14 -0.003 0.015 0.024 0.045 0.051 0.021 0.025 0.032 -0.009 0.019 0.110 0.144 32 12/05/14 0.000 0.028 -0.032 0.081 -0.020 0.035 0.005 0.051 0.005 0.032 -0.245 0.251 33 06/06/14 0.020 0.028 0.076 0.073 -0.005 0.035 0.052 0.057 0.009 0.032 -0.065 0.245 33 10/02/14 -0.003 0.027 0.010 0.092 0.034 0.036 -0.065 0.061 -0.037 0.039 -0.009 0.268 34 01/24/14 -0.016 0.036 -0.020 0.090 0.015 0.030 -0.008 0.053 -0.035 0.032 -0.028 0.234 34 06/06/14 -0.010 0.027 -0.137 0.075 -0.002 0.030 0.029 0.049 0.027 0.027 -0.087 0.201 34 08/06/14 -0.019 0.028 -0.082 0.077 -0.012 0.031 -0.029 0.049 -0.022 0.027 0.067 0.214 37 06/06/14 0.021 0.029 -0.060 0.075 0.011 0.031 -0.010 0.053 -0.011 0.031 -0.102 0.241 37 09/15/14 0.002 0.027 -0.017 0.070 0.016 0.029 -0.020 0.052 -0.018 0.029 0.075 0.288 39 06/25/14 0.033 0.029 -0.153 0.067 0.017 0.029 0.044 0.046 -0.009 0.027 0.037 0.214 67 06/16/14 -0.001 0.029 -0.103 0.081 0.010 0.032 0.030 0.057 -0.007 0.029 0.174 0.265 3-32

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

COLLECTION LOCATION DATE Ag-11iM Sb-1 25 1-131 Cs- 134 Cs- 137 Ac-228

(+/-)

31 01/06/14 -0.001 0.025 -0.050 0.067 0.109 0.187 -0.014 0.028 0.005 0.026 0.117 0.217 31 03/25/14 -0.017 0.036 0.047 0.093 -0.036 0.066 0.005 0.034 0.004 0.037 0.281 0.384 31 09/15/14 -0.005 0.032 0.000 0.086 -0.033 0.074 0.012 0.035 -0.003 0.036 1.529 0.268 32 06/25/14 -0.019 0.016 0.031 0.046 -0.014 0.063 0.002 0.018 0.017 0.017 1.107 0.122 32 12/05/14 -0.010 0.027 -0.010 0.072 0.069 0.102 0.025 0.026 0.001 0.030 0.902 0.232 33 06/06/14 -0.009 0.028 0.036 0.075 -0.027 0.088 0.027 0.034 0.014 0.029 0.015 0.257 33 10/02/14 0.025 0.028 0.006 0.075 0.044 0.225 -0.012 0.033 -0.005 0.030 0.128 0.211 34 01/24/14 0.004 0.027 -0.023 0.064 0.065 0.120 0.006 0.029 0.010 0.029 0.095 0.107 34 06/06/14 -0.013 0.024 0.017 0.060 -0.045 0.072 -0.014 0.028 0.020 0.026 0.091 0.117 34 08/06/14 -0.024 0.023 0.006 0.062 0.048 0.062 0.006 0.025 -0.011 0.027 0.239 0.167 37 06/06/14 -0.010 0.028 0.055 0.069 0.054 0.085 -0.003 0.030 -0.007 0.030 0.053 0.279 37 09/15/14 0.011 0.022 0.036 0.071 0.039 0.060 -0.014 0.029 -0.011 0.026 0.217 0.139 39 06/25/14 0.014 0.025 0.024 0.059 -0.054 0.080 0.013 0.023 0.113 0.037 0.985 0.187 67 06/16/14 -0.054 0.030 0.005 0.074 0.052 0.055 0.034 0.031 0.038 0.035 0.112 0.277 3-33

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 16 AQUATIC FLORA - FUCUS (pCi/g wet wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 29 02/19/14 0.2591 0.1219 5.5840 0.3271 0.0281 0.0766 -0.0037 0.0077 -0.0020 0.0079 0.0069 0.0188 29 06/03/14 0.0535 0.0911 5.9590 0.4139 0.0306 0.0860 0.0082 0.0091 -0.0010 0.0103 -0.0085 0.0222 29 08/07/14 0.0770 0.0787 8.0350 0.5114 -0.0228 0.0905 0.0016 0.0098 -0.0008 0.0111 0.0261 0.0265 29 10/01/14 0.0075 0.0916 7.1570 0.4945 -0.0168 0.1009 0.0026 0.0095 -0.0073 0.0101 0.0282 0.0224 32 02/19/14 0.1162 0.0968 8.3640 0.4136 -0.0213 0.0813 -0.0070 0.0084 0.0022 0.0082 -0.0011 0.0196 32 06/03/14 0.0317 0.1010 8.4000 0.4995 -0.0273 0.1030 -0.0002 0.0104 0.0026 0.0101 -0.0040 0.0231 32 08/07/14 0.0573 0.0645 8.0000 0.3774 -0.0252 0.0655 0.0036 0.0066 -0.0003 0.0071 0.0185 0.0174 32 10/01/14 0.0843 0.1167 8.2660 0.6487 -0.0165 0.1297 -0.0045 0.0136 -0.0002 0.0149 -0.0089 0.0371 35 02/26/14 0.2579 0.1691 6.4860 0.4517 0.0291 0.0840 -0.0067 0.0100 -0.0010 0.0099 0.0213 0.0268 35 06/03/14 0.1628 0.1209 7.1670 0.5471 -0.0673 0.1358 0.0053 0.0136 -0.0005 0.0153 0.0009 0.0345 35 08/07/14 0.0904 0.0747 8.0590 0.4106 0.0176 0.0865 -0.0084 0.0083 -0.0054 0.0092 0.0073 0.0219 35 10/01/14 0.0179 0.0898 7.5450 0.5066 -0.0236 0.1104 0.0025 0.0110 0.0018 0.0109 -0.0003 0.0290 36 03/25/14 0.1239 0.1881 6.4190 0.4727 0.0279 0.0890 -0.0028 0.0099 0.0049 0.0106 0.0198 0.0258 36 06/06/14 0.1541 0.1201 5.8160 0.5173 0.0837 0.0982 -0.0058 0.0108 0.0042 0.0127 0.0010 0.0277 36 09/15/14 0.0744 0.1111 6.8600 0.6160 -0.0111 0.1228 0.0008 0.0150 -0.0120 0.0148 0.0189 0.0389 36 10/15/14 0.1464 0.0920 7.8490 0.5087 0.0075 0.0878 -0.0002 0.0090 0.0044 0.0109 0.0001 0.0240 90 01/24/14 0.1961 0.0915 5.7980 0.2449 0.0439 0.0599 -0.0016 0.0059 -0.0039 0.0064 -0.0152 0.0166 90 06/06/14 0.0664 0.1053 7.2600 0.5126 -0.0166 0.1137 -0.0022 0.0106 -0.0098 0.0113 0.0037 0.0268 90 08/06114 -0.0284 0.1114 7.2690 0.6273 0.0424 0.1099 -0.0009 0.0125 0.0046 0.0136 -0.0192 0.0328 90 10/02/14 -0.0151 0.1125 6.8260 0.6544 -0.0523 0.1199 -0.0142 0.0128 0.0075 0.0133 0.0068 0.0342 3-34

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 16 AQUATIC FLORA - FUCUS (pCi/g wet wt.)

COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-) (+1-) (*/-)

29 02/19/14 0.0003 0.0092 -0.0287 0.0211 0.0006 0.0081 0.0000 0.0149 0.0086 0.0086 0.0018 0.0687 29 06/03/14 0.0077 0.0105 -0.0123 0.0248 -0.0072 0.0088 0.0080 0.0171 -0.0027 0.0096 -0.0388 0.0865 29 08/07/14 0.0038 0.0102 -0.0090 0.0281 0.0030 0.0114 -0.0198 0.0183 0.0038 0.0108 -0.0604 0.0948 29 10/01/14 -0.0016 0.0122 -0.0068 0.0241 0.0063 0.0101 0.0110 0.0187 -0.0019 0.0112 -0.0471 0.0841 32 02/19/14 -0.0039 0.0095 -0.0132 0.0203 0.0098 0.0082 0.0161 0.0135 -0.0035 0.0085. -0.0057 0.0656 32 06/03/14 -0.0062 0.0104 0.0010 0.0251 0.0087 0.0105 -0.0023 0.0202 0.0008 0.0119 -0.0353 0.0890 32 08/07/14 0.0065 0.0072 -0.0132 0.0190 -0.0056 0.0080 -0.0053 0.0127 -0.0022 0.0074 0.0270 0.0564 32 10/01/14 0.0094 0.0144 -0.0162 0.0361 0.0176 0.0152 -0.0105 0.0274 -0.0085 0.0134 -0.0067 0.1092 35 02/26/14 0.0064 0.0145 -0.0299 0.0269 -0.0014 0.0113 -0.0056 0.0178 0.0002 0.0104 0.0662 0.0937 35 06/03/14 -0.0081 0.0124 0.0136 0.0355 -0.0040 0.0133 0.0020 0.0246 0.0103 0.0154 -0.0414 0.1317 35 08/07/14 -0.0080 0.0086 -0.0289 0.0213 0.0049 0.0080 0.0122 0.0157 0.0049 0.0089 -0.0080 0.0703 35 10/01/14 -0.0056 0.0113 0.0041 0.0255 0.0071 0.0114 0.0176 0.0189 0.0012 0.0116 -0.0012 0.0889 36 03/25/14 -0.0028 0.0085 -0.0309 0.0260 0.0015 0.0095 -0.0095 0.0159 0.0021 0.0108 0.0533 0.0817 36 06/06/14 0.0040 0.0115 -0.0470 0.0299 -0.0005 0.0113 0.0079 0.0197 0.0022 0.0108 -0.0888 0.0818 36 09/15/14 -0.0107 0.0156 -0.0187 0.0394 0.0098 0.0151 0.0048 0.0248 0.0038 0.0155 0.0011 0.1307 36 10/15/14 -0.0097 0.0086 0.0122 0.0241 0.0042 0.0099 0.0001 0.0195 0.0051 0.0098 -0.0547 0.0924 90 01/24/14 -0.0004 0.0080 -0.0123 0.0151 0.0018 0.0064 0.0152 0.0114 -0.0047 0.0067 -0.0442 0.0530 90 06/06/14 -0.0028 0.0114 -0.0304 0.0293 0.0043 0.0119 0.0161 0.0200 -0.0002 0.0126 -0.0033 0.0954 90 08/06/14 0.0045 0.0149 -0.0311 0.0349 0.0051 0.0116 -0.0027 0.0229 -0.0190 0.0145 -0.0157 0.1037 90 10/02/14 0.0034 0.0145 -0.0668 0.0359 -0.0103 0.0156 -0.0086 0.0269 0.0001 0.0149 0.0052 0.1095 3-35

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 16 AQUATIC FLORA - FUCUS (pCi/g wet wt.)

COLLECTION LOCATION DATE Ag-1 10M Sb-125 1-131 Cs-134 Cs-137 Ac-228

(+1-) (+1-) (+/-)

29 02/19/14 0.0018 0.0074 -0.0047 0.0198 0.0053 0.0247 -0.0197 0.0086 -0.0042 0.0076 0.1177 0.0551 29 06/03/14 0.0071 0.0087 -0.0024 0.0229 0.0124 0.0184 -0.0087 0.0099 0.0017 0.0096 0.0605 0.0711 29 08/07/14 0.0007 0.0094 -0.0055 0.0266 0.0047 0.0263 -0.0059 0.0114 0.0063 0.0105 0.0791 0.0726 29 10/01/14 -0.0015 0.0091 0.0165 0.0252 -0.0082 0.0253 -0.0139 0.0097 0.0081 0.0090 0.0462 0.0718 32 02/19/14 0.0065 0.0076 -0.0192 0.0193 0.0211 0.0246 -0.0012 0.0076 -0.0024 0.0080 0.0351 0.0630 32 06/03/14 0.0078 0.0114 0.0016 0.0271 0.0138 0.0225 -0.0175 0.0111 -0.0168 0.0119 0.0721 0.0767 32 08/07/14 0.0086 0.0070 -0.0158 0.0174 0.0153 0.0193 -0.0025 0.0073 -0.0045 0.0075 0.0067 0.0515 32 10/01/14 0.0007 0.0125 -0.0065 0.0340 0.0169 0.0313 -0.0215 0.0127 0.0004 0.0145 0.0968 0.0594 35 02/26/14 -0.0052 0.0099 0.0067 0.0248 0.0093 0.0173 0.0015 0.0109 0.0063 0.0108 0.0761 0.0653 35 06/03/14 -0.0028 0.0132 -0.0201 0.0360 0.0206 0.0294 -0.0090 0.0136 0.0033 0.0140 0.1063 0.0643 35 08/07/14 -0.0028 0.0080 0.0034 0.0215 0.0070 0.0230 -0.0035 0.0091 0.0004 0.0088 0.0883 0.0492 35 10/01/14 0.0018 0.0095 -0.0010 0.0273 -0.0046 0.0289 -0.0105 0.0109 -0.0047 0.0104 0.0577 0.0469 36 03/25/14 0.0008 0.0093 -0.0126 0.0267 0.0097 0.0182 0.0024 0.0102 0.0043 0.0100 0.0446 0.0427 36 06/06/14 0.0077 0.0097 0.0092 0.0260 0.0268 0.0282 0.0044 0.0103 -0.0140 0.0108 0.0449 0.0498 36 09/15/14 -0.0056 0.0147 -0.0234 0.0355 -0.0037 0.0276 -0.0032 0.0161 -0.0086 0.0161 0.0474 0.0605 36 10/15/14 -0.0037 0.0094 0.0061 0.0277 0.0055 0.0181 -0.0029 0.0098 0.0037 0.0102 0.0806 0.0536 90 01/24/14 0.0031 0.0053 0.0034 0.0131 0.0056 0.0234 -0.0024 0.0062 -0.0027 0.0056 0.0596 0.0403 90 06/06/14 -0.0020 0.0098 0.0221 0.0288 0.0106 0.0298 -0.0037 0.0119 0.0169 0.0114 0.1272 0.0643 90 08/06/14 0.0090 0.0123 -0.0225 0.0340 -0.0051 0.0250 -0.0173 0.0125 -0.0042 0.0141 0.0526 0.0526 90 10/02/14 0.0007 0.0121 0.0024 0.0338 0.0389 0.0311 -0.0067 0.0126 0.0031 0.0136 -0.0010 0.0517 3-36

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 17A FISH - FLOUNDER (pCi/g wet wt.)

COLLECTION LOCATION DATE Be-7 (+--) K-40 Cr-51 Mn-54 Co-58 Fe-59

(+1-)

35 05/07/2014 0.018 0.203 4.570 0.797 0.027 0.208 -0.006 0.027 0.018 0.023 0.039 0.048 Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+1-)

35 05/07/2014 -0.019 0.026 -0.050 0.057 0.009 0.023 0.000 0.043 0.016 0.026 -0.011 0.230 Ag-110M Sb-125 1-131 Cs- 134 Cs-137 Ac-228

(+1-) (+--)

0.020 0.026 -0.003 0.091 35 05/07/2014 -0.014 0.024 -0.011 0.063 0.036 0.040 -0.010 0.029 3-37

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 17B FISH - OTHER (pCi/g wet wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59

(+/-)

29 06/18/14 0.042 0.056 4.577 0.310 0.010 0.070 0.005 0.006 -0.003 0.006 -0.005 0.015 29 08/27/14 0.035 0.093 4.709 0.362 0.023 0.113 0.004 0.009 -0.002 0.010 0.001 0.023 32 04/03/14 0.090 0.128 5.755 0.405 -0.098 0.153 0.004 0.013 0.005 0.014 -0.002 0.029 32 10/17/14 -0.028 0.056 4.206 0.514 0.029 0.070 -0.002 0.006 0.002 0.007 -0.005 0.017 35 05/27/14 0.034 0.111 6.456 0.435 -0.045 0.123 -0.014 0.013 -0.004 0.013 0.008 0.028 35 07/29/14 0.046 0.147 4.688 0.537 0.043 0.167 0.006 0.016 -0.002 0.017 0.034 0.043 35 10/21/14 0.039 0.098 4.285 0.528 0.083 0.118 0.001 0.010 -0.006 0.010 -0.014 0.022 Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+1-) (+/-) (+7-) (+/-) (+77-, (+/-)

29 06/18/14 -0.001 0.005 -0.001 0.012 -0.002 0.007 -0.008 0.012 -0.007 0.008 -0.044 0.049 29 08/27/14 0.011 0.009 -0.004 0.021 -0.004 0.010 0.011 0.019 -0.005 0.012 -0.085 0.081 32 04/03/14 0.014 0.013 0.031 0.033 0.026 0.015 -0.004 0.026 0.008 0.016 0.025 0.129 32 10/17/14 -0.001 0.006 0.010 0.012 -0.001 0.007 0.004 0.014 0.000 0.009 0.060 0.064 35 05/27/14 -0.002 0.014 -0.062 0.031 0.003 0.014 0.021 0.023 -0.006 0.014 0.096 0.118 35 07/29/14 0.017 0.016 -0.078 0.046 0.001 0.016 0.002 0.029 -0.004 0.019 -0.090 0.133 35 10/21/14 -0.001 0.009 0.006 0.021 0.004 0.011 -0.004 0.018 0.003 0.012 -0.010 0.089 A*-1i0M Sb-125 1-131 Cs-134 Cs-137 Ac-228

(+/-) (*/-)

29 06/18/14 0.000 0.005 0.001 0.014 0.003 0.045 -0.001 0.005 0.003 0.006 0.000 0.052 29 32 08/27/14 -0.006 0.008 -0.010 0.024 -0.050 0.052 -0.009 0.010 0.004 0.009 -0.045 0.045 32 04/03/14 0.002 0.014 0.000 0.037 0.056 0.043 -0.002 0.017 0.004 0.015 0.007 0.081 10/17/14 -0.003 0.006 0.010 0.017 -0.008 0.032 -0.001 0.006 0.003 0.006 0.093 0.100 35 35 05/27/14 0.002 0.012 -0.013 0.035 0.013 0.026 -0.005 0.014 -0.003 0.014 0.011 0.059 35 07/29/14 -0.007 0.014 -0.018 0.043 -0.008 0.056 0.000 0.017 -0.004 0.015 0.019 0.062 10/21/14 0.003 0.009 0.024 0.026 0.007 0.040 -0.006 0.011 -0.008 0.010 0.018 0.038 3-38

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 18 MUSSELS (pCi/g wet wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59

(+/-) (+/-) (+/-) (+/-) (+/-) (+/-)

30 03/07/14 0.146 0.273 1.774 0.776 0.087 0.288 -0.005 0.033 -0.020 0.028 0.016 0.061 30 06/10/14 -1.049 0.449 1.566 0.948 -0.116 0.428 0.001 0.047 -0.027 0.040 0.100 0.102 Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-) (+/-) (+/-)

30 03/07/14 0.039 0.033 -0.034 0.061 0.009 0.032 0.031 0.062 -0.013 0.035 0.051 0.274 30 06/10/14 0.020 0.041 -0.064 0.110 0.008 0.047 -0.042 0.079 -0.032 0.050 -0.032 0.413 Ag-110M Sb-125 1-131(+/-) Cs-1 34

(+/-) Cs-1 37 -) Ac-228

(+/-)

(+1-) (+/-) (+-

30 03/07/14 0.018 0.030 -0.016 0.070 0.049 0.074 -0.025 0.028 -0.004 0.035 0.047 0.115 30 06/10/14 -0.007 0.044 -0.057 0.131 -0.069 0.098 0.004 0.049 0.023 0.050 -0.094 0.174 3-39

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 19 OYSTERS (pCi/g wet wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59

(+/-) (+/-) (+/-) (+/-) (+/-) (+/-)

31 02/25/14 0.096 0.209 1.886 0.473 -0.088 0.212 0.010 0.023 -0.008 0.024 0.011 0.044 31 06/03/14 0.266 0.228 1.964 0.577 -0.017 0.228 -0.019 0.023 0.014 0.024 0.039 0.052 31 07/08/14 0.061 0.149 2.124 0.547 -0.104 0.154 -0.010 0.017 0.006 0.018 0.017 0.033 31 12/17/14 0.143 0.269 0.437 0.716 0.219 0.314 -0.013 0.024 0.006 0.028 0.010 0.047 32 03/05/14 0.080 0.280 2.428 0.711 -0.091 0.302 0.003 0.029 -0.009 0.029 0.025 0.052 32 05/27/14 0.472 0.352 2.549 0.919 0.107 0.360 0.011 0.038 0.000 0.042 0.041 0.075 32 07/11/14 0.048 0.222 1.986 0.538 -0.067 0.236 0.008 0.025 0.003 0.020 0.007 0.050 32 12/17/14 -0.325 0.392 1.889 1.030 -0.217 0.445 -0.015 0.041 0.002 0.043 -0.022 0.078 37 03/11/14 0.140 0.251 1.275 0.779 -0.029 0.249 -0.011 0.029 -0.015 0.032 -0.010 0.049 37 06/04114 -0.026 0.330 1.693 0.787 -0.118 0.403 -0.001 0.035 -0.001 0.038 0.071 0.070 37 07/09/14 0.077 0.119 1.701 0.359 -0.033 0.124 0.000 0.013 0.001 0.013 0.003 0.028 37 12/16/14 0.055 0.234 1.887 0.684 -0.025 0.338 0.005 0.034 -0.009 0.035 0.051 0.077 88 02/27/14 -0.051 0.169 1.627 0.454 0.018 0.152 0.001 0.017 -0.008 0.019 0.022 0.040 88 05/27/14 0.038 0.333 2.016 0.939 0.345 0.329 0.016 0.039 -0.017 0.036 0.003 0.070 88 07/15/14 0.039 0.241 2.357 0.639 0.000 0.269 -0.010 0.030 -0.011 0.028 -0.025 0.056 88 12/16/14 0.003 0.304 3.731 0.613 0.002 0.375 -0.029 0.032 -0.011 0.033 -0.008 0.064 3-40

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 19 OYSTERS (pCi/g wet wt.)

COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-1 03 Ru- 106

(+0-)

31 02/25/14 0.014 0.021 -0.012 0.060 0.012 0.021 0.036 0.036 0.009 0.025 -0.039 0.203 31 06/03/14 0.017 0.032 0.015 0.051 -0.007 0.024 0.029 0.048 -0.009 0.026 -0.019 0.238 31 07/08/14 -0.003 0.018 -0.029 0.042 -0.011 0.020 -0.010 0.030 0.005 0.016 0.054 0.148 31 12/17/14 0.004 0.017 0.002 0.043 -0.021 0.029 0.003 0.055 -0.008 0.033 0.156 0.221 32 03/05/14 0.005 0.034 -0.062 0.064 0.031 0.032 -0.005 0.063 0.005 0.034 0.368 0.294 32 05/27/14 0.012 0.040 -0.089 0.099 0.044 0.063 -0.001 0.070 -0.040 0.044 -0.087 0.386 32 07/11/14 -0.015 0.025 -0.068 0.058 0.009 0.025 -0.012 0.044 -0.007 0.027 0.081 0.218 32 12/17/14 0.023 0.041 -0.007 0.096 0.013 0.045 0.011 0.073 -0.001 0.048 -0.124 0.356 37 03/11/14 0.036 0.034 0.028 0.071 0.004 0.027 0.012 0.041 0.014 0.027 -0.243 0.257 37 06/04/14 -0.006 0.036 -0.090 0.076 -0.008 0.038 -0.027 0.062 -0.061 0.045 0.224 0.360 37 07/09/14 0.002 0.014 0.008 0.030 -0.001 0.013 0.006 0.024 0.001 0.013 0.026 0.120 37 12/16/14 -0.011 0.023 -0.040 0.076 0.030 0.030 0.002 0.059 -0.008 0.035 -0.089 0.200 88 02/27/14 0.022 0.022 -0.024 0.041 0.024 0.019 0.042 0.032 -0.007 0.018 -0.066 0.165 88 05/27/14 0.027 0.036 0.026 0.082 -0.004 0.039 -0.003 0.065 -0.011 0.040 -0.141 0.352 88 07/15/14 0.006 0.028 -0.062 0.067 0.003 0.029 0.007 0.050 0.008 0.031 -0.062 0.272 88 12/16/14 -0.007 0.032 -0.002 0.070 0.035 0.034 -0.021 0.058 0.024 0.039 0.122 0.330 3-41

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 19 OYSTERS (pCi/g wet wt.)

COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-134 Cs-137 Ac-228

(+1-) (+1-) (+1-) (+/-) (+/-) (+/-)

31 02/25/14 0.013 0.022 -0.005 0.059 -0.006 0.047 0.004 0.026 -0.013 0.024 -0.069 0.088 31 06/03/14 0.005 0.024 -0.019 0.064 0.002 0.050 -0.031 0.026 -0.001 0.026 -0.067 0.106 31 07/08/14 0.000 0.015 -0.002 0.045 -0.008 0.031 -0.011 0.020 -0.001 0.018 0.014 0.063 31 12/17/14 0.015 0.025 -0.035 0.074 -0.073 0.083 -0.020 0.026 -0.007 0.028 0.015 0.116 32 03/05/14 0.063 0.036 0.018 0.087 -0.001 0.063 -0.023 0.034 -0.051 0.042 -0.032 0.112 32 05/27/14 0.485 0.059 0.002 0.108 0.047 0.079 -0.011 0.041 0.020 0.048 0.097 0.154 32 07/11/14 0.012 0.024 -0.035 0.070 -0.009 0.058 0.004 0.025 -0.014 0.027 -0.010 0.092 32 12/17/14 0.028 0.043 0.055 0.112 0.012 0.126 0.032 0.047 0.028 0.046 -0.065 0.160 37 03/11/14 0.017 0.024 -0.009 0.076 0.010 0.049 -0.005 0.031 -0.004 0.026` -0.011 0.114 37 06/04/14 0.013 0.029 0.028 0.100 -0.063 0.122 -0.003 0.042 -0.011 0.036 0.082 0.189 37 07/09/14 0.002 0.013 0.018 0.036 -0.004 0.022 -0.003 0.014 -0.009 0.015 0.008 0.052 37 12/16/14 0.008 0.031 -0.051 0.084 -0.048 0.093 -0.010 0.029 -0.029 0.034 0.001 0.140 88 02/27/14 -0.001 0.017 -0.031 0.047 -0.002 0.029 0.000 0.020 0.001 0.019 0.026 0.058 88 05/27/14 -0.002 0.032 -0.013 0.103 0.017 0.072 0.012 0.040 -0.024 0.035 -0.069 0.150 88 07/15/14 0.002 0.028 -0.023 0.079 -0.039 0.053 0.010 0.033 0.019 0.031 0.005 0.107 88 12/16/14 -0.027 0.028 -0.047 0.098 0.094 0.108 0.089 0.041 -0.023 0.031 -0.057 0.116 3-42

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 20 CLAMS (pCi/g wet wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59

(+/-) (+1-) (+/-) (+/-) (+/-) (+1-)

29 02/21/14 0.159 0.187 2.448 0.546 0.080 0.228 0.012 0.018 0.003 0.021 -0.011 0.044 29 06/19/14 -0.048 0.258 2.420 0.530 -0.082 0.306 0.015 0.022 -0.001 0.025 0.008 0.055 29 08/20/14 -0.059 0.163 2.031 0.678 -0.201 0.168 -0.015 0.020 -0.009 0.026 0.034 0.041 29 10/07/14 0.096 0.358 2.322 0.752 -0.081 0.388 -0.007 0.043 0.031 0.038 0.031 0.090 38 03/20/14 0.164 0.369 2.103 0.814 -0.074 0.482 0.002 0.035 -0.011 0.037 0.027 0.073 38 06/20/14 -0.174 0.253 2.243 0.551 -0.249 0.341 0.015 0.024 0.001 0.026 -0.012 0.059 38 08/19/14 -0.203 0.315 1.868 0.771 -0.048 0.337 -0.001 0.038 -0.009 0.031 0.064 0.062 38 11/12/14 0.112 0.212 2.104 0.628 -0.113 0.251 0.003 0.028 0.009 0.029 0.021 0.053 Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-) (+/-) (+1-) (+1-) (+1-) (+1-)

29 02/21/14 0.007 0.022 -0.024 0.043 0.008 0.025 -0.024 0.041 -0.022 0.025 -0.052 0.195 29 06/19/14 -0.007 0.020 -0.009 0.050 0.010 0.027 -0.009 0.047 -0.009 0.031 -0.134 0.206 29 08/20/14 0.017 0.021 -0.001 0.051 -0.013 0.027 -0.014 0.040 0.009 0.020 0.087 0.188 29 10/07/14 0.009 0.035 0.081 0.098 -0.013 0.041 0.001 0.071 -0.026 0.044 -0.101 0.371 38 03/20/14 0.037 0.034 -0.025 0.075 0.025 0.037 -0.056 0.067 0.008 0.046 -0.065 0.404 38 06/20/14 0.007 0.020 -0.028 0.055 0.017 0.027 0.028 0.050 -0.017 0.037 -0.077 0.251 38 08/19/14 0.011 0.038 -0.002 0.088 0.011 0.036 0.069 0.066 0.016 0.037 -0.144 0.334 38 11/12/14 0.044 0.027 0.010 0.068 -0.010 0.027 0.016 0.050 0.013 0.029 -0.027 0.258 Ag-i10M Sb-125 1-131 Cs-134 Cs-137 Ac-228 29 02/21/14 -0.015 0.018 -0.064 0.054 0.021 0.062 -0.018 0.023 0.017 0.020 -0.001 0.076 29 06/19/14 -0.017 0.023 -0.047 0.059 0.076 0.180 -0.003 0.027 0.009 0.023 0.045 0.083 29 08/20/14 0.001 0.021 -0.023 0.057 0.010 0.035 0.013 0.025 0.014 0.025 0.050 0.099 29 10/07/14 0.006 0.041 -0.032 0.101 -0.016 0.109 -0.009 0.054 -0.027 0.046 0.064 0.147 38 03/20/14 0.017 0.037 -0.014 0.107 0.032 0.132 0.008 0.042 0.040 0.040 -0.008 0.121 38 06/20/14 -0.015 0.025 0.005 0.068 0.043 0.177 -0.021 0.024 -0.014 0.025 -0.088 0.079 38 08/19/14 -0.020 0.032 0.023 0.104 -0.017 0.066 -0.003 0.041 0.011 0.037 0.053 0.137 38 11/12/14 0.023 0.026 -0.040 0.070 -0.081 0.069 -0.043 0.030 -0.017 0.027 0.081 0.104 3-43

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 21 SCALLOPS Scallops were not sampled in 2014. See discussion in Section 4.21 3-44

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE 22 LOBSTERS (pCi/g wet wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59

(+1-) (+1-) (+1-) (+1-) (+1-) (+/-)

32 02/26/14 0.051 0.328 2.875 0.979 0.087 0.395 -0.029 0.038 0.018 0.034 0.019 0.069 32 05106/14 0.016 0.378 3.344 1.121 -0.093 0.423 0.003 0.040 0.000 0.035 -0.047 0.085 35 02/20/14 0.253 0.320 4.422 0.933 0.034 0.382 -0.001 0.035 0.003 0.038 0.040 0.084 35 05/06/14 -0.643 0.439 2.535 1.146 -0.047 0.483 -0.044 0.053 0.025 0.051 -0.056 0.114 35 07/28/14 0.374 0.411 3.526 0.897 0.233 0.448 0.015 0.036 0.007 0.042 -0.023 0.088 35 10/31/14 0.191 0.541 4.961 1.296 0.034 0.581 0.020 0.053 0.021 0.062 0.009 0.115 89 08/06/14 0.202 0.302 3.388 0.902 -0.038 0.374 0.013 0.039 -0.009 0.037 0.038 0.077 89 12/15/14 0.277 0.532 1.716 1.596 -0.242 0.646 -0.056 0.055 0.003 0.047 -0.005 0.102 CO-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-) (+/-) (+/-) (+/-) (+/-)(+-.

32 02/26/14 0.012 0.035 0.022 0.081 0.033 0.043 0.040 0.064 0.019 0.043 0.564 0.363 32 05/06/14 -0.043 0.042 -0.014 0.096 0.015 0.038 0.028 0.076 0.003 0.054 0.144 0.391 35 02/20/14 0.020 0.039 -0.095 0.081 0.018 0.036 0.001 0.072 0.027 0.042 0.129 0.316 35 05/06/14 -0.005 0.050 0.055 0.118 -0.007 0.064 0.000 0.092 -0.020 0.056 -0.247 0.465 35 07/28/14 -0.036 0.045 -0.008 0.110 0.012 0.042 -0.009 0.073 0.014 0.049 -0.033 0.366 35 10/31/14 0.032 0.057 -0.048 0.134 -0.013 0.063 0.052 0.117 0.055 0.071 -0.072 0.539 89 08/06/14 0.025 0.041 -0.055 0.112 -0.001 0.038 0.040 0.071 -0.016 0.037 0.059 0.295 89 12/15/14 0.005 0.036 -0.150 0.139 0.011 0.069 -0.047 0.097 -0.011 0.076 -0.150 0.619 Ag-110M Sb-125 1-131 Cs-134 Cs-137 Ac-228

(+/-) (+/-) +1 --

) -- (+/-) (+/-) (777-,

32 02/26/14 -0.025 0.036 -0.039 0.106 0.040 0.074 0.005 0.044 -0.011 0.041 0.235 0.211 32 05106/14 -0.014 0.045 -0.123 0.120 -0.021 0.093 -0.109 0.049 -0,012 0.045 -0.088 0.181 35 02/20/14 0.024 0.035 -0.053 0.102 0.072 0.106 -0.036 0.042 -0.006 0.037 -0.157 0.137 35 05/06/14 -0.044 0.045 -0.008 0.134 0.065 0.103 -0.072 0.053 0.009 0.052 -0.113 0.220 35 07/28/14 -0.010 0.036 0.083 0.092 -0.033 0.150 -0.083 0.049 -0.009 0.038 -0.042 0.149 35 10/31/14 0.054 0.061 -0.076 0.164 0.011 0.182 -0.030 0.061 0.045 0.067 -0.088 0.234 89 08/06/14 0.003 0.035 0.023 0.096 -0.060 0.078 -0.016 0.044 0.028 0.039 0.174 0.157 89 12/15/14 -0.016 0.062 0.066 0.181 0.136 0.202 -0.013 0.061 0.054 0.062 0.013 0.160 3-45

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014

4. DISCUSSION OF RESULTS This section summarizes the results of the analyses on the REMP samples. DNC has carefully examined the data throughout the year and has presented in this section all cases where station related radioactivity could be detected. The results are compared with previous environmental surveillance data.

Few impacts of the station operation on the environment were observed. Sub-sections contain a description of each particular media or potential exposure pathway. Naturally occurring nuclides such as Be-7, K-40, and Th-232 (and its daughters Th-228 and Ac-228) were detected in numerous samples. Be-7, which is produced by cosmic processes, was observed predominantly in airborne and vegetation samples. Th-232 and daughter results were variable and are generally at levels higher than station related radionuclides.

Cs-137 and Sr-90 from atmospheric nuclear weapons testing in the 1960's have been observed in the past. During 2014 Cs-137 from weapons was detected in soil samples and in one sediment sample. Sr-90 was not detected in 2014.

4.1 Gamma Exposure Rate (Table 1)

Gamma exposure rate is determined from the integrated exposure measured over a calendar quarter using TLDs. Prior to 1990, Victoreen CaF 2 (Mn) glass bulb dosimeters were used for these measurements. In 1990, these were replaced by Harshaw CaF 2(Mn) chips. In 2000, the CaF 2(Mn) TLDs, were replaced with the CaSO4 (Tm) Panasonic model UD-804 ASx TLDs. The Panasonic TLD design currently being used in the program is described in the vendor manual (Reference 19). Readings are recorded as uR/hr. The unit uR stands for

.micro (u)-roentgen' with a 'micro' being one-millionth of a roentgen. A roentgen is the quantity of radiation equal to 87.6 ergs of energy per gram of air.

The dosimeters are strategically placed at a number of on-site locations, as well as at inner and outer off-site locations. Starting in 2001, the collection of TLDs was changed from monthly to quarterly and additional measurement locations were incorporated into the REMP requirements listed in the REMODCM (Reference 8). Three more locations (73-75) were added in mid-2003 to prepare for monitoring the potential effect from the ISFSI. Two Dry Cask Containers were loaded in the first quarter 2005. Three containers were loaded in mid 2006, three in October 2007, three in April 2009, and three in October 2010. None were loaded in 2008 or from 2011 to 2014. The exposure rate measurements at two of the three additional TLD locations remain basically unchanged from the background measurements performed prior to any cask loading (six quarter background average mid 2003 - 2004: 9.1 uR/hour at Location 73, 7.4 uR/hour at Location 74 and 6.7 uR/hour at Location 75). At Location 73 the readings in 2014 were lower.

4-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Table 1 lists the exposure rate measurements for all 44 monitored locations. Trends similar to those of past years are apparent. These measurements demonstrate the general variations in background radiation between the various onsite and offsite locations and include gamma exposure from all sources of radioactivity. For example, the Weather Shack (Location 2), Millstone Unit 3 Discharge (Location 5), Environmental Laboratory (Location 8),

Bay Point Beach (Location 9), Pleasure Beach (Location 10), Corey Road (Location 48), and Site Switchyard Fence (Location 73) experience higher exposure rates due to their proximity to granite beds and stonewalls. In addition, the Mystic (Location 13C) and Ledyard (Location 14C) control locations experience relatively higher background exposure rate than the other control locations at Norwich and Old Lyme (Locations 15C and 16C).

The only appreciable effect seen in the recent TLD data is that attributable to the variation in the background radiation that is consistent with previous years. Figure 4.1-1 shows a historical trend of TLD exposure rate measurements, comparing an annual average of all indicator TLDs, an annual average of all control TLDs, and the annual average of the two most critical indicator locations which are used to represent the two closest site boundary residences in the North-northwest and Northeast directions. Examination of the average measurements since 1990, shows interesting site changes and site characteristics. For example, the averages of all indicator locations for the period when Millstone Unit 1 was still in operation (through 1999) exhibit the effects of N-16 BWR turbine building skyshine to immediate areas onsite. As discussed in previous annual reports, the effects of skyshine at onsite monitoring stations were increased exposure rates as high as 6 uR/hr at certain onsite locations. The elevated exposure rates from skyshine decreased rapidly with distance to levels indistinguishable from normal background measurements at even the nearest offsite monitoring stations. Also apparent in Figure 4.1-1 is a change of the type of TLD dosimeter in the year 2000. The difference in response between the two types of TLD dosimeters is apparent, with the new type reading 15% to 20% lower. This lower response is consistent for all locations, including both indicator and control locations.

Figure 4.1-1 also relates the difference in critical indicator locations 1 and 3 and the annual average of all indicator TLDs to the annual average of the control TLDs collected and measured during coincident periods throughout the year. As discussed earlier, the exposure measurements of many indicator locations onsite (and two of the control locations) are influenced by natural background exposure differences caused by the many granite out-croppings typical of the local area. Figure 4.1-1 shows the annual average at indicator Location 1 is slightly higher in gamma exposure rate than the average control gamma exposure rate. An opposite trend is shown for Location 3. These differences are the result of the differences in granite at these locations. Location 3 was moved in the second quarter 2009 to minimize the effect of tree covering for the air sampler also located at this location.

The 2009 to 2014 data for Location 3 shows an increase likely attributable to the being closer to granite at the new location.

4-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Figure 4.1-4 Atutual Giuiuua Exposure Rate - 20 Year Hisloiy uR/hr mAlU Indicators a Al Controls 10- I mIndicator Loc 1 I =Indtcator Loc 3 a- I In ýý =MrF- ff- M W M W 6-4-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 4.2 Air Particulate Gross Beta Radioactivity (Table 2)

Air is continuously sampled at seven inner ring (0 to 2 miles) locations and one control location (14 miles N) by passing it through glass fiber particulate filters. These samples are collected weekly for the first six months and every two weeks for the second six months and analyzed for gross beta radioactivity. Results are shown on Figure 4.2-1 and Table 2.

Gross beta activity remained at levels similar to that seen over the last decade. Inner and control monitoring locations continue to show no significant variation in measured activities (see Figure 4.2-2). This indicates that any station contribution is not measurable.

Figure 4.2-1 3

pCi/M Air Particulate Gross Beta Activity Monthly Average - 2014 0.02 00 0.0200 -Indicators Control 0.0180 0.0160 0.0140 0.0120 0,0100 0.0080 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Figure 4.2-2 Air Particulate Gross Beta Activity Monthly Averages- 5 Year Trend pCi/m3 0.030 In(

0.025 0.020 0.015 0.010 0.005 1 . . . . . . . . .

o ~0 0 - - 0-- - a ( e fu fu c ~ r . . n 4, . 8 .

4-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 4.4 Airborne Iodine (Table 3)

Charcoal cartridges are included at all of the air particulate monitoring stations for the collection of atmospheric iodine. These cartridges were analyzed for 1-131 on a weekly for the first half of the year and every two weeks for the second half of the year. No detectable levels of 1-131 were seen in the 2014 charcoal samples.

4.4 Air Particulate Gamma (Table 4)

The air particulate samples that are utilized for the gross beta analyses are composited quarterly and analyzed for gamma emitting isotopes. The results, as shown in Table 4, indicate the presence of naturally occurring Be-7, which is produced by cosmic radiation. No other positive results are seen. These analyses indicate the lack of station effects.

4.5 Air Particulate Strontium (Table 5)

Prior to 1989 Table 5 was used for listing the data for measurements of Sr-89 and Sr-90 in quarterly composite air particulate filters. The historical data indicated the lack of any detectable station related activity. Since these analyses are not listed in NUREG-1301 (Reference 15), these measurements were discontinued. In the event of widespread station related contamination or other unusual events, these measurements could be made.

Historically, when world events created conditions that caused detectable measurements of these nuclides, there was no difference noted between indicator and control locations. This further confirms that any of the detectable levels for these nuclides were not station related.

4.6 Soil (Table 6)

This media is collected annually from one control and two indicator locations. Millstone has collected and analyzed soil since 2001. Prior to 2001, soil had not been sampled for over fifteen years because station related detectable activity had not been detected. Similarly, since 2001, no station detectable activity has been seen in these samples. Naturally occurring K-40 and Ac-228 is detected in soil. Also detected is Cs-137 from nuclear weapons testing. The results of these samples, allows for the determination of baseline activity levels in soil. This is particularly important for Cs-137, since significant levels from past weapons testing fallout remain in the soil. Figure 4.6-1 shows the trend of Cs-137 in soil samples. Except for Location 4, the trend appears to be declining with time. Baseline levels should be useful in the future, when site characterization and decommissioning of the station become the focus during preparations for license termination.

Figure 4.6-1 pci/gm Cs-137 ir Soil 18--Loc 3 ---0 Loc4 1.6 1.4 _

1.2-0.8- 0 .8. .. . . ... . . .. . ... .. . ... 0,.......  :. -  :

0.6 . . . . . ...

0.4 - -.

O .Z ... . .....

2000 2002 2004 2006 2008 2010 2012 2014 Year 4-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 4.7 Cow Milk (Table 7)

Typically, the most sensitive indicator of fission product existence in the terrestrial environment is the radiological analysis of milk samples. Milk is a widely consumed food, therefore it is usually one of the most critical exposure pathways. Since 1996 all dairy (cow) farms close enough to Millstone to be considered an indicator location (i.e. within 10 miles) have ceased operation. One cow milk location, about ten and half miles from the station, was sampled as an extra (i.e.; not required) sample and results are shown in Table 7.

Naturally occurring K-40 is the only positive result seen in cow milk.

Each year the Land Use Census is used to identify locations of milk animals that should be included in the monitoring program. It is performed annually and is maintained by observations, door-to-door surveys and consulting with local agriculture authorities. The 2014 census is listed in Appendix A. If a new dairy farm is identified close enough to Millstone to be considered an indicator location, the collection of cow milk at that location would be added.

4.8 Goat Milk (Table 8)

When available, these samples are collected twice per month during grazing season and once per month during the rest of the year. Because goat milk was not available in 2014, no samples were collected.

4.9 Pasture Grass/Hay/Feed (Table 9)

Per REMODCM requirements, pasture grass is collected as a substitute when goat milk is not available. Although not required by the REMODCM, hay or feed is substituted when pasture grass is not available. During the winter months and early spring, insufficient growth often prohibits sampling of pasture grass. No station effects are noted in these samples.

Cosmic produced Be-7 was observed in the samples of pasture grass which were taken during the warmer months. Naturally occurring K-40 was present in all samples being approximately two times higher in hay and feed compared to pasture grass samples.

4.10 Well Water (Table 10)

There were no station related activity detected in the samples collected as part of the REMP.

Additional samples from this well, and other wells, were obtained as part of the Groundwater Protection Program (GWPP). Results from the GWPP are reported in the Millstone annual "Radioactive Effluent Release Report" for 2014.

4.11 Reservoir Water (Table 11)

Reservoir water samples are special samples not required by the REMP. Previous data has shown the lack of detectable station activity in this media. This fact and the extremely unlikely possibility of observing routine station effluents in this media have resulted in discontinuing these samples. In the event of widespread station related contamination, these samples may be collected.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 4.12 Fruits and Vegetables (Table 12)

Consistent with past years, this media did not show any station effects. Naturally occurring K-40 was detected in all samples.

4.13 Broad Leaf Vegqetation (Table 13)

Consistent with past years, this media did not show any station effects. Most samples had detectable levels of cosmic produced Be-7 and naturally occurring K-40 at levels consistent with previous years. Occasionally these samples indicate positive levels of Cs-137 in the past. This can be attributed to fallout from weapons testing which has been widespread in terrestrial samples for many years.

4.14 Seawater (Table 14)

The guidance in Reference 15 specifies one sample upstream (control - beyond significant influence of the discharge) and one sample downstream (indicator - beyond but near the mixing zone) for surface water samples. Historically the downstream sample for Millstone has been located in the vicinity of discharge (location 32 - see Reference 8) which is prior to the mixing zone. This location was chosen since it was readily accessible and not affected by cold weather conditions. Operation of an automatic sampler at the indicator location is necessary for providing a representative sample. Any dose consequences can be assessed by use of the appropriate dilution factors. It's not as necessary to have a continuous sampler at the control location due to the historical relative consistency noted in seawater background activity near the Millstone.

A technician collects an aliquot from the automatic sampler at Location 32 on a weekly frequency. These samples are composited for monthly analyses. For the Control Location, Giant's Neck (Location 37C), six weekly grab samples are obtained for quarterly compositing.

Naturally occurring K-40 was the only detectable gamma activity seen in these samples.

Measured station related levels of H-3 inseawater from the immediate vicinity of discharge (location 32) were observed in most samples. Tritium releases are typically higher near outages due to the need for increased liquid processing during these times. As mentioned above, these samples are taken directly from liquid effluent flow prior to dilution into the Long Island Sound. Dilution studies performed for this discharge have determined that a dilution factor of 3 is appropriate to estimate concentrations immediately outside the quarry within a near-field area.

Tritium builds up in the reactor coolant during each fuel cycle. It is generated during station operation from fission and neutron reactions. Between 1992 and 2002, H-3 was not typically detected. However, due to the enhanced detection sensitivity, H-3 levels are now often detected at the indicator location. Figure 4.14-1 shows an eighteen-year trend of H-3 releases in the Millstone liquid effluents versus the measured environmental concentrations from the vicinity of discharge location.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Figure 4.14-1 H-3 Curies Released versus Seawater Concentration 18 Year Trend 1700 1600 1500 T* . Curies discharaed 1400 .. REMP pCi/liter 1300 1200 1100 1000 9000 goo 9J I II Soo -i 700 i 300 200 100 0 i r- I1' co 000 CD 0 Q0 00 0

Ul) 0 go 0

4a 0

r-05 0 00 0

00 0 40 Q N V

04 el 0 00 0 00 0 40 0D 0 Q 0 V 04 V Cl 00 N V 0 M N V- Cl 00 4 - IV 00 NM V- 0 N 4.15 Bottom Sediment (Table 15)

There was no station related radioactivity detected in bottom sediment samples in 2014.

Naturally occurring K-40 is seen in all samples and naturally occurring Ac-228 in some samples. Cs-137 from nuclear weapons testing was seen in one sample from Location #39.

This location is where inland streams deposit sediment and can be correlated to soil sample results for Cs-137. Bottom sediment is not a significant dose pathway to man, especially at areas not typically used by the public.

4.16 Aquatic Flora (Table 16)

Although sampling of this media is not required, it provides useful information since it a very sensitive indicator of radioactivity in the environment. Naturally occurring Be-7 and Ac-228 appear in some samples and K-40 in all samples. Low levels of man-made radioactivity (e.g., Mn-54, Co-58, Co-60, Zn-65, 1-131 and Ag-1 1Om) have been detected in the past but not in 2014.

4.17 Fish (Tables 17A and 17B)

The activity in Flounder (Table 17A) and Other Fish (Table 17B) is the same as that seen in the past. No activity was observed except for the naturally occurring K-40.

4.18 Mussels (Table 18)

Similar to the last several years, this sampling media showed no activity except for the naturally occurring K-40. Mussels were not available at Two Three Island (Location #28) and were only available at Niantic Shoals (Location #30) for two quarters during 2014.

4-8

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 4.19 Oysters (Table 19)

All locations utilize oysters stocked in trays. The stocked trays are kept at sampling areas and represent conditions in those areas. Due to safety concerns Location #32 was moved over eight years ago to a more accessible area in the middle of the quarry. Although it is labeled as vicinity of the discharge, it was previously located at the end of the quarry. For 2014, no Millstone activity was observed in oysters both in the quarry and beyond the Millstone discharge area. The near-field dilution factor for liquid discharges from the Millstone Quarry discharge is a factor of 3.

Naturally occurring K-40 is seen in most samples. Millstone related Ag-1 10m and Zn-65 in oysters collected at Location #32 have been seen historically. Oysters have a high capacity for accumulating silver and zinc. Studies have shown that oysters can accumulate as much as 50 times or more the amount of zinc compared to most other seafood. A remarkable correlation existed between the Zn-65 concentration measured in the native quarry oysters and the amount of Zn-65 discharged into the environment. However, since the permanent shutdown of Millstone Unit 1 in 1996, the amount of Zn-65 in liquid effluents has decreased significantly. Starting in 2001, no Zn-65 has been detected in either the liquid effluents or in oysters. Figure 4.19-1, shows a historical trend that existed between Zn-65 releases and measured concentrations in quarry oysters. The decreasing trend in effluent radioactive releases is apparent in both the curies released and the measured concentrations in oysters.

Figure 4.19-2 shows the trend of Ag-1 1Om concentration in quarry oysters compared to the liquid effluents discharged. Similar to Zn-65, the correlation between Ag-11 On discharged and the Ag-i 1Om concentration measured in the native quarry oysters is apparent. Per regulatory guidance (Reference 7), the bioaccumulation factors for both zinc and silver were adjusted based upon several years of historical data to account for the higher measured uptakes.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 Figure 4.19-1 Zn-65 COMPARISON Curies Curies Discharged vs. Native Oyster Concentration pCI/grm 0.1 100

- Curies Discharged 0.01 R--e-- Oyster Conc.

0.001 v1 0.0001 0.1 0.00001 0.01 0.000001 0.001 w w C0Qr .

Quarter- - - -

Figure 4.19-2 Curies Ag-110m COMPARISON Oyster Discharge Curies Discharged vs. Oyster Concentration Concentration 0.25 0.0025

- - - Oyster concentration -- Curies discharge

• 9 0.2 II 9 0.002 II iI I II1 0.15 0.0015

.1 0.1 . :r' " 0.001 0.05 0.0005 0 t- ---- - - -'"0- -

Quarter 4-10

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 4.20 Clams (Table 20)

Occasionally this media indicates the presence of station related radioactivity. In 2014 no activity was observed except for the naturally occurring K-40.

4.21 Scallops (Table 21)

No scallop samples have been available for several years.

4.22 Lobsters (Table 22)

No activity was observed except for the naturally occurring K-40.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014

5. REFERENCES

1) United States of America, Code of Federal Regulations, Title 10, Part 50, Appendix A Criteria 64.

2) Donald T. Oakley, "Natural Radiation Exposure in the United States." U. S.

Environmental Protection Agency, ORP/SID 72-1, June 1972.

3) National Council on Radiation Protection and Measurements, Report No. 160, "Ionizing Radiation Exposures of the Population of the United States," March 2009.

4) National Council on Radiation Protection and Measurements, Report No. 94, "Exposure of the Populationtof the United States and Canada from Natural Background Radiation,"

December 1987.

5) United States Nuclear Regulatory Commission, Regulatory Guide 8.29, "Instructions Concerning Risks from Occupational Radiation Exposure," Revision 0, July 1981.

6) United States of America, Code of Federal Regulations, Title 10, Part 20.1302.

7) United States Nuclear Regulatory Commission, Regulatory Guide 1.109, "Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Evaluating Compliance with 10 CFR Part 50, Appendix I," Revision 1, October 1977.

8) Millstone Power Station Radiological Effluent Monitoring and Offsite Dose Calculation Manual, Revision 027-00, March 13, 2014.

9) Millstone Nuclear Power Station Unit 1 Defueled Technical Specifications.

10) Millstone Nuclear Power Station Unit 2 Technical Specifications, License No. DPR-65.

11) Millstone Nuclear Power Station Unit 3 Technical Specifications, License No. NPF-49.

12) United States Nuclear Regulatory Commission, Regulatory Guide 4.1, "Program for Monitoring Radioactivity in the Environs of Nuclear Power Plants," Rev. 1, April 1975.

13) ICNlTracerLab, "Millstone Nuclear Power Station Pre-operational Environmental Radiation Survey Program, Quarterly Reports," April 1967 to June 1970.

14) International Commission of Radiological Protection, Publication No. 43, "Principles of Monitoring for the Radiation Protection of the Population," May 1984.

15) United States Nuclear Regulatory Commission, NUREG-1 301, "Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Pressurized Water Reactors," April 1991.

16) United States Nuclear Regulatory Commission, Branch Technical Position, "An Acceptable Radiological Environmental Monitoring Program," Rev. 1, November 1979.

17) Reassessment of Millstone Power Station's Environmental Monitoring Data, Connecticut Department of Environmental Protection, Division of Radiation, March 2006.

18) Nuclear Regulatory Commission Regulatory Guide 4.1, Radiological Environmental Monitoring for Nuclear Power Plants, Revision 2, June 2009.

19) Environmental Dosimetry Company Quality System Manual, Manual 1, Revision 3, Aug. 1,2012.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 APPENDIX A LAND USE CENSUS FOR 2014 A-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 The annual land use census in the vicinity of Millstone was conducted as required by the Millstone REMODCM. Typically the cow milk locations are identified by a review of the annual registration information obtained from the State of Connecticut Department of Agriculture. Gardens are located by a drive-by during the harvest season. Although broadleaf sampling was performed and may be used in lieu of a garden census, gardens were included in the 2014 census. Only vegetable gardens having an area of more than 500 square feet need to be identified. Due to the difficulty of measuring individual gardens, the nearest garden within each directional sector identified by a drive-by survey is listed.

Garden distances are based on nearest resident assuming that a resident may plant a new garden.

Goat locations are more difficult to determine, but best efforts are made to consult goat association records, contact previous owners or perform drive-bys, if necessary.

Results of the land use census are given in Tables A-1 through A-3. No new dairy animals within 10 miles of the Millstone were located during the census. From 2013 to 2014 one dairy cow locations was deleted and two locations were added. For goat milk locations, four were deleted and three added from 2013 to 2014. The closest goat location at 2.1 miles has not had milk available for three years and was dropped from the sampling program in 2014. The control location at 20.8 miles was also dropped.

Distances to closest resident and garden were changed in three downwind directions.

The dose modeling incorporates the distances listed in Tables A-1, A-2 and A-3.

TABLE A-1 Active Dairy Cows Within 20 Miles of Millstone Point - 2014 Direction Distance Location miles meters N 18.0 29,000 Bozrah N 18.5 29,800 North Franklin N 19.3 31,100 North Franklin N 19.5 31,400 North Franklin NNE 15.3 24,600 Preston NNE 16.2 26,100 Preston NNE 16.6 26,700 Norwich NNE 17.7 28,500 Preston NNE 17.9 28,800 Preston NE 15.3 24,600 Preston NE 18.9 30,400 North Stonington NE 19.3 31,100 North Stonington ENE 17.9 28,800 North Stonington WNW 10.3 16,600 Lyme (REMP Location #22)

NNW 19.5 31,400 Lebanon A-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE A-2 Dairy Goats Within 20 Miles of Millstone Point - 2014 Direction Distance Location miles meters N 2.1 3,400 Waterford (REMP Location #21 discontinued on 7/1/14)

N 10.0 16,100 Oakdale N 17.3 27,800 Lebanon N 19.2 30,900 Lebanon NNE 17.1 27,500 Preston NE 17.9 28,800 North Stonington ENE 11.5 19,000 Stonington (Mystic)

ENE 12.8 20,600 Stonington ENE 13.3 21,400 Stonington (Mystic)

ENE 17.8 28,600 North Stonington WNW 7.3 11,700 Old Lyme WNW 14.6 23,500 Hadlyme WNW 17.6 28,300 Haddam NW 17.9 28,800 East Haddam NNW 12.2 19,600 Salem NNW 18.1 29,100 Colchester NNW 19.5 31,400 Lebanon NNW 20.8 33,500 Hebron (REMP Location #24 discontinued on 7/1/14)

A-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 TABLE A-3 2014 Resident and Garden Survey Closest Distance For:

Downwind Resident Garden Direction miles meters I miles meters N 0.96 1552 0.96 1552 NNE 0.53 851 0.53 851 NE 0.46 741 0.46 741 ENE* 1.00 1601 1.00 1601 E 0.91 1457 0.91 1457 ESE 1.06 1698 1.06 1698 SE N/A N/A N/A N/A SSE N/A N/A N/A N/A S N/A N/A N/A N/A SSW N/A N/A N/A N/A SW* 2.26 3643 2.26 3643 WSW 1.98 3184 1.98 3184 W 1.77 2846 1.77 2846 WNW* 1.50 2418 1.48 2381 NW 1.34 2152 1.34 2152 NNW 0.51 816 0.51 816

• New location for 2014 N/A - not applicable (over water sectors)

A-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 APPENDIX B

SUMMARY

OF INTERLABORATORY COMPARISONS B-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014 INTRODUCTION This appendix summarizes the Intercomparison Program of the Teledyne Brown Engineering (TBE)

Laboratory as required by technical specifications for each Millstone unit. Teledyne uses QA/QOC samples provided by Eckert & Ziegler Analytics, by the Environmental Resource Associates (ERA)

Proficiency Test (PT) Program and by the Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) to monitor the quality of analytical processing associated with the REMP.

The suite of samples are comparable with the pre-1996 US EPA Interlaboratory Cross-Check Program in terms of sample number, matrices, and nuclides. It includes:

• milk for gamma (9 nuclides) analyses once per quarter

• milk for low level Iodine-1 31 analyses once per quarter

• milk for Sr-89 and Sr-90 analyses once per quarter

• water for gamma (6 to 8 nuclides) once per quarter

• water for tritium analyses once per quarter

• water for Sr-90 analyses three of four quarters

• water for gamma Sr-89 analyses twice per year

• air filter for gamma (9 nuclides) analyses once per quarter

• air filter for gross beta analysis twice per year

• charcoal filter for 1-131 once per quarter

• air filter for Sr-90 analyses twice per year

" soil for gamma (7 or 9 nuclides) analyses twice per year

• vegetation for gamma (6 nuclides) analyses twice per year

" vegetation for Sr-90 analyses twice per year Intercomparison program results are evaluated using the laboratory's internal bias acceptance criterion.

Teledyne Brown's acceptance criterion is defined as within 20% of the known value. Sample results which are less or greater than 20% of the known value but within 30% is acceptable with warning.

Samples results outside 30% of the known value are not acceptable. All sample analyses which are not acceptable are investigated.

RESULTS For the TBE laboratory, 163 out of 169 analyses performed met the specified acceptance criteria. Six analyses did not meet the specified acceptance criteria or internal QA requirements. This included Ni-63, K-40 and 1-131 in water and two Sr-90 and one Gross Alpha in air filters. (Although Sr-90 and Gross Alpha in air filters is not applicable to the Millstone REMP it is included here as a check on the overall vendor program.) The six analyses which did not meet acceptance criteria are discussed below:

1. Teledyne Brown Engineering's MAPEP March 2014 Ni-63 in water result of 32.7 +/- 1.69 Bq/L was overlooked when reporting the data but would have passed the acceptance range of 23.9 - 44.2 Bq/L.

2. Teledyne Brown Engineering's MAPEP March 2014 K-40 in water result of 1.63 +/- 2.49 Bq/L was overlooked when reporting the data but would have passed the false positive test.

3. Teledyne Brown Engineering's ERA November 2014 1-131 in water result of 15.8 pCi/L was lower than the known value of 20.3 pCi/L, failing below the lower acceptance limit of 16.8. The result was evaluated as failed with a found to known ratio of 0.778. No cause could be found for the slightly low result. All ERA 1-131 evaluations since 2004 have been acceptable.

B-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2014

4. Teledyne Brown Engineering's MAPEP March 2014 Sr-90 in AP result of 0.822 Bq/sample was lower than the known value of 1.18 Bq/sample, failing below the lower acceptance limit of 0.83 Bq/sample. The rerun result was still low, but fell within the lower acceptance range of 0.836. The rerun result was statistically the same number as the original result. No cause could be found for the slightly low results.

5. Teledyne Brown Engineering's MAPEP September 2014 Sr-90 in AP result of 0.310 Bq/sample was lower than the known value of 0.703 Bq/sample. The gravimetric yield of 117% was very high (we normally see yields of 60% to 70 %) and could account for the low activity.

6. Teledyne Brown Engineering's MAPEP September 2014 Gr-Alpha in AP result of 0.153 Bq/sample was lower than the known value of 0.53 Bq/sample. The AP sample was counted on the wrong side. The AP was flipped over and recounted with acceptable results.

B-3