Text

Annual Radiological Environmental Operating Report
	ML13129A317
Person / Time
Site:	Millstone
Issue date:	04/24/2013
From:	Macmanus R; Dominion, Dominion Nuclear Connecticut
To:	; Document Control Desk, NRC/FSME, Office of Nuclear Reactor Regulation
References
	13-214
	Download: ML13129A317 (106)
	v • d • e

Dominion Nuclear Connecticut, Inc.

Rope Ferry Road, Watero*ord. CT 06385

\Web Address: www.dorn.cool IPvominion APR 2 4 2013 U.S. Nuclear Regulatory Commission Serial No.13-214 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 2012 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT This letter transmits the Annual Radiological Environmental Operating Report for the Millstone Power Station, for the period January 2012 through December 2012. 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. William D. Bartron at (860) 444 4301.

SincereI R. K. MacManus Director, Nuclear Station Safety and Licensing

Serial No.13-214 2012 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 R. G. Rolph NRC Inspector U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 J. S. Kim NRC Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08-C2A 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station

Serial No.13-214 2012 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 P. Kelley Waterford-East Lyme Shellfish Commission Waterford Town Hall Waterford, CT 06385 J. A. Martinez 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.13-214 2012 Annual Radiological Environmental Operating Report Page 4 of 4 D. Steward First Selectman Town of Waterford Waterford Town Hall Waterford, CT 06385 P. M. Formica 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.13-214 Docket Nos. 50-245 50-336 50-423 License Nos. DPR-21 DPR-65 NPF-49 ATTACHMENT 1 2012 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION UNITS 1, 2, AND 3 DOMINION NUCLEAR CONNECTICUT, INC. (DNC)

Millstone Power Station 2012 Radiological Environmental Operating Report January 1, 2012 - December 31, 2012 Dominion Nuclear Connecticut, Inc.

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

'Dominion

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM 2012 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 2012

- TABLE OF CONTENTS EXECUTIVE

SUMMARY

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

1. INTRO DUCTIO N ....................................................................................... 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 O perations ............................................................. 1-3 1.5 Radioactive Effluent Control ............................................................. 1-8 1.6 Radiological Impact on Hum ans .................................................... 1-11

2. PROGRAM DESCRIPTION .......................................................................... 2-1 2.1 Sam pling Schedule and Locations ................................................... 2-1 2.2 Sam ples Collected During Report Period ......................................... 2-5

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

4. DISCUSSION OF RESULTS ........................................................................ 4-1 4.1 Gam ma Exposure Rate (Table 1) ................................................... 4-1 4.2 Air Particulate Gross Beta Radioactivity (Table 2) .......................... 4-3 4.3 Airborne Iodine (Table 3) ................................................................ 4-4 4.4 Air Particulate Gam m a (Table 4) ..................................................... 4-4 4.5 Air Particulate Strontium (Table 5) .................................................. 4-4 4.6 Soil (Table 6) ................................................................................... 4-5 4.7 Cow Milk (Table 7) .......................................................................... 4-5 4.8 Goat Milk (Table 8) .......................................................................... 4-5 4.9 Pasture Grass and Feed (Table 9) .................................................. 4-5 4.10 Well W ater (Table 10) ..................................................................... 4-5 4.11 Reservoir W ater (Table 11) .............................................................. 4-6 4.12 Fruits and Vegetables (Table 12) .................................................... 4-6 4.13 Broad Leaf Vegetation (Table 13) ................................................... 4-6 4.14 Seawater (Table 14) ...................................................................... 4-76 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 4.17.1 Flounder (Table 17A) ........................................................ 4.8 4.17.2 Fish - Other (Table 17B) .................................................... 4.8 4.18 Mussels (Table 18) .......................................................................... 4-8 4.19 Oysters (Table 19) .......................................................................... 4-9 4.20 Clams (Table 20) .......................................................................... 4-11 4.21 Scallops (Table 21) ....................................................................... 4-11 4.22 Lobsters (Table 22) ....................................................................... 4-11

5. DISCUSSION ................................................................................ 5-1

6. REFERENCES ............................................................................. 6-1 APPENDIX A - LAND USE CENSUS FOR 2012 ............................................ A-1 APPENDIX B -

SUMMARY

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

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 EXECUTIVE

SUMMARY

INTRODUCTION This report summarizes the results of the Radiological Environmental Monitoring Program (REMP) conducted in the vicinity of MPS during the period from January 1 to December 31, 2012. This document has been prepared in accordance with the requirements of the MPS Units 1, 2 and 3 (MPS1, 2 and 3) Technical Specifications.

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

SAMPLING AND ANALYSIS The environmental sampling media collected in the vicinity of MPS and at distant locations included terrestrial samples in the form of air particulate filters, charcoal cartridges, soil, and cow milk, pasture grass, 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 2012, there were 1056 samples collected from the atmospheric, aquatic, and terrestrial environments. In addition, 174 exposure measurements were obtained using environmental thermoluminescent dosimeters (TLDs). A description of all discrepancies from the sample collection requirements in the Millstone Radiological Effluent Monitoring and Offsite Dose Calculation Manual (REMODCM) is presented in the Notes for the Data Tables of this report.

There were 1125 analyses performed on the environmental media samples. Teledyne Brown Engineering, Inc. of Knoxville, Tennessee performed the analyses as required by the MPS REMODCM.

LAND USE CENSUS The annual land use census in the vicinity of MPS was conducted as required by the MPS REMODCM during 2012. Although broadleaf sampling may be used in lieu of a garden census, gardens were included in the 2012 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 in Appendix A. No new dairy animals within 10 miles of the MPS were located during the census. Monthly broad leaf sampling was also performed; it may be used in lieu of the garden census.

RADIOLOGICAL IMPACT TO THE ENVIRONMENT The predominant radioactivity for many samples was from non-plant related sources, such as fallout from nuclear weapons tests and naturally occurring radionuclides.

There was no plant related activity detected in any of the terrestrial samples collected as part of the MPS REMP.

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Several aquatic samples did show plant related activity. Monitoring of seawater in the area of the discharge indicated the presence of the tritium, a station related radionuclide. Tritium was only found onsite inside the mixing zone of the quarry discharge at levels that were expected from routine plant operation. Radioactive iodine was found in three flora (seaweed) samples, one at the discharge point, one in Niantic Bay adjacent to the plant and one in Jordon Cove just east of the discharge point. Ag-1 1Om was found in two oysters taken onstie from the Millstone Quarry. No radioactivity was found in edible seafood sampled beyond the discharge point.

Offsite ambient radiation measurements using environmental TLDs beyond the site boundary ranged between 53 and 103 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 2012, radiation doses to the general public as a result of MPS'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 MPS operations for 2012 was approximately 0.2 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.

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.

CONCLUSIONS The 2012 REMP for MPS resulted in the collection and analysis of over a thousand environmental samples and measurements. The data obtained were used to determine the impact of MPS'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 MPS's operation.

iJ

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012

1. INTRODUCTION This section provides an overview of the MPS 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 2012 performed by Dominion Nuclear Connecticut (DNC) for MPS is discussed in this report. Since the operation of a nuclear power plant results in the release of small amounts of radioactivity and low levels of radiation, the Nuclear Regulatory Commission (NRC) requires a program be established to monitor radiation and radioactivity in the environment (References 1, 6 & 10). This report, published annually per MPS's Technical Specifications (section 5.7.2 for MPS1, section 6.9.1.6 for MPS2 and Section 6.9.1.3 for MPS3), summarizes the results of measurements of radiation and radioactivity in the environment in the vicinity of the MPS and at distant locations during the period January 1 to December 31, 2012.

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 and goat 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 MPS operation and other natural and man-made sources. These results are reviewed by MPS'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 plant 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 MPS.

1.2 Radiation and Radioactivity All matter is made of atoms. An atom is the smallest component into which matter can be broken down and still maintain all its chemical properties. Nuclear radiation is energy, in the form of waves or particles that is 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 nuclear weapons testing. Examples of radioactive fallout that is normally present in environmental samples are cesium-137 and strontium-90. Some examples of radioactive materials released from a nuclear power plant are cesium-137, iodine-131, strontium-90, and cobalt-60.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 substantially since the mid 1980's because of the increased usage of medical procedures involving exposure to radiation (see Reference 3).

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 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, (5) 0.3 External, terrestrial 21 Occupational 0.5 Weapons Fallout < 1 Nuclear Power Plants < 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)

(5) Industrial, security, medical, educational and research 1-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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.

Additionally, 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).

The 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 plants (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 MPS generates about 2100 megawatts of electricity at full power, which provides approximately one-third of the power consumed in the State of Connecticut. MPS2 and MPS3 are pressurized water reactors (MPS1, 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 MPS2 began in December 1975 and MPS3 in May 1986.

MPS was operational during most of 2012, with the exception of a refueling outage at MPS2 in October. The annual capacity factor for MPS2 was 82.1% and for MPS3 was 100.5%.

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. The cooling water source for MPS is the Niantic Bay.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 The key difference between nuclear power and conventional power is the source of heat used to boil the water. Conventional plants burn fossil fuels in a boiler, while nuclear plants 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 heat 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).

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 Neutrons Uranium Fission Products Figure 1.4-1 Radioactive Fission Product Formation 1-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Radioactive activation products (see Figure 1.4-2), 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-occurring atoms that are made unstable or radioactive by neutron bombardment. These activation products circulate along with the reactor coolant water and will deposit on the internal 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 1.4-2 Radioactive Activation Product Formation At MPS there are five independent protective barriers that confine these radioactive materials. These five barriers, which are shown in Figure 1.4-3, are:

0 fuel pellets; 0 fuel cladding; 0 reactor vessel and associated piping and equipment; 0 primary containment and, 0 secondary containment (enclosure building).

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 SIMPLIFIED DIAGRAM OF A PRESSURIZED WATER REACTOR Pressurized water reactor-a common type of Light Water COOLING E40 WLATER1 CONDENSER G

WASTE HEAT TO THE ENYKRONMENT Figure 1.4-3 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.

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. Small amounts of radioactivity may be released from primary containment during operation to maintain proper containment pressure and during maintenance and refueling outages.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 MPS'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. Also, prior to a release to the environment, 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 control of radioactive effluents at MPS will be discussed in more detail in the next section.

1.5 Radioactive Effluent Control The small amounts of radioactive liquids and gases that might escape the first two barriers are purified 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 when necessary the processed liquid is re-used in plant systems.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Prior to release, the radioactivity in the 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 would 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 Niantic Bay 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 Long Island Sound. 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.

Another means for adjusting liquid effluent concentrations to below federal limits is by mixing plant cooling water from the condenser with the liquid effluents prior to release to the discharge canal. This larger volume of cooling water further lowers the radioactivity levels to below the release concentration limits.

The preceding discussion illustrates that many controls exist to reduce the radioactive liquid effluents released to the Niantic Bay 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 MPS3) ventilation system;

stack and vent effluent radioactivity monitors;

sampling and analysis of stack and 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 plant process computer aids in tracking the monitor readings. To supplement the information continuously provided by the detector, air samples are taken periodically from the containment, stack and vents. These samples are analyzed to quantify the total amount of tritium and radioactive gaseous and particulate effluents released.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Gases from the primary coolant are held up in waste gas decay tanks for decay at MPS2.

Gaseous waste at MPS3 is purified through a process gas system, consisting of high-efficiency particulate air filters and charcoal adsorber beds. Gases from periodic venting of the MPS2 containment are released through a similar process system (Enclosure Building Filtration System) while gases from the MPS3 containment vacuum pumps are released without treatment. If necessary, MPS3 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 MPS2 are filtered by high-efficiency particulate filters while at MPS3 these are not normally filtered. If necessary, particulate and charcoal filters can be used for these purges.

The auxiliary building ventilation system provides for ventilation of the auxiliary building and enclosure building (and service building and contiguous areas, waste disposal building, and fuel building for MPS3, for MPS2 these are all part of the auxiliary building). Normally, the air from the ventilation of these areas will exhaust through the ventilation vent (which has a particulate filter for MPS2). If exhaust from these areas reaches a predetermined level, the ventilation flow can be diverted by operator control to a particulate and charcoal filtration system.

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 in some of the waste effluent lines will automatically shut to stop the release, or Control Room operators can implement procedures to ensure that federal regulatory limits are always met.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 1.6 Radiologqical 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 calculations of the dose impact to the general public from MPS's radioactive effluents are performed. The purpose of these calculations is to periodically assess the doses to the general public resulting from radioactive effluents to ensure that these doses are being maintained as far below the federal dose limits 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 MPS during each given 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. Section 5 of this report discusses the detailed dose calculations from the RERR and provides a comparison to REMP dose calculations. The liquid and gaseous effluents were well below the federal release limits and were a small percentage of the MPS 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, drinking water supplies, 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 MPS to its effect on man. The movement of radioactivity through the environment and its transport to humans is portrayed in Figure 1.6.

1-11

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 EXAMPLES OF MPS'S RADIATION EXPOSURE PATHWAYS c-c---.

>GASEOUS kEFFLUENTS)

LIQUID EFFLUENTS (4. (SOIL DIRECT DEPOSITION)

RADIATION (AIR SUBMERSION)

C'/

1. SHORELINE DIRECT RADIATION (FISHING, PICNICING) >t 5. CONSUMPTION (VEGETATION) q.. DEPOSITION

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

6. CONSUMPTION (MILK AND MEAT) DEPOSITION INGESTION I / ---% b

3. CONSUMPTION (FISH, SHELLFISH)

INGESTION Figure 1.6 Radiation Exposure Pathways 1-12

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 There are three major pathways in which liquid effluents affect humans:

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

external radiation from immersion in ocean water containing radioactive liquids; and,

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

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

external radiation from an airborne plume of radioactivity;

internal radiation from inhalation of airborne radioactivity;

external radiation from deposition of radioactive effluents on soil;

ambient (direct) radiation from contained sources at the power plant;

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.

In addition, ambient (direct) radiation emitted from contained sources of radioactivity at MPS contributes to radiation exposure in the vicinity of the plant. For example, small amounts of ambient radiation result 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 very small amounts 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. When MPS-related radioactivity is detected in samples that represent a plausible exposure pathway, the resulting dose from such exposure is assessed (see Sections 4 and 5). However, the operation of MPS 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 documented and described in detail in the MPS'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.

After dose calculations are performed, the results are compared to the federal dose limits for the public. The two federal agencies that are charged with the responsibility of protecting the public from radiation and radioactivity are the NRC and the EPA.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 The NRC, in 10 CFR 20.1301 (Reference 9) limits the levels of radiation to unrestricted areas resulting from the possession or use of radioactive materials such that they limit any individual to a dose of:

less than or equal to 100 mrem per year to the total body.

In addition to this dose limit, the NRC has established design objectives for nuclear plant licensees. Conformance to these guidelines ensures that nuclear power reactor effluents are maintained as far below the legal limits as is reasonably achievable.

The NRC, in 10 CFR 50 Appendix I (Reference 10) establishes design objectives for the dose to a member of the general public from radioactive material in liquid effluents released to unrestricted areas to be limited to:

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

less than or equal to 10 mrem per year to any organ.

The air dose due to release of noble gases in gaseous effluents is restricted to:

less than or equal to 10 mrad per year for gamma radiation; and,

less than or equal to 20 mrad per year for beta radiation.

The dose to a member of the general public from iodine-131, tritium, and all particulate radionuclides with half-lives greater than 8 days in gaseous effluents is limited to:

less than or equal to 15 mrem per year to any organ.

The EPA, in 40 CFR 190.10 (Reference 11), sets forth the environmental standards for the uranium fuel cycle. During normal operation, the annual dose to any member of the public, at or beyond the site boundary, from the entire uranium fuel cycle shall be limited 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 summary of the 2012 radiological impact for MPS and comparison with the EPA dose limits and Appendix I guidelines is presented in Section 5 of this report.

The third stage of assessing releases to the environment is the REMP. The description and results of the REMP at MPS during 2012 is discussed in Sections 2 through 4 of this report.

1-14

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012

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 and Figures 2.1, 2.2 and 2.3. 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 and shown on the figures.

2-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Table 2-1 Environmental Monitoring Program Sampling Types and Locations Location Direction &

Number* Location Name Distance From Sample Types Release Point**

1-1 On-site - Old Millstone Rd. 0.6 Mi, NNW TLD, Air Particulate, Iodine, Vegetation 2-1 On-site - Weather Shack 0.3 Mi, S TLD, Air Particulate, Iodine 3-1 On-site - Bird Sanctuary 0.3 Mi, NE TLD, Air Particulate, Iodine, Soil 4-1 On-site - Albacore Drive 1.0 Mi, N TLD, Air Particulate, Iodine, Soil 5-1 MP3 Discharge 0.1 Mi, SSE TLD 6-1 Quarry Discharge 0.3 Mi, SSE TLD 7-1 Environmental Lab Dock 0.3 Mi, SE TLD 8-1 Environmental Lab 0.3 Mi, SE TLD 9-1 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-C Fisher's Island, NY 8.0 Mi, ESE TLD 13-X 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 18-X Cow 10.4 Mi, NW Milk 22-X Cow 10.5 Mi, WNW Milk 21-1 Goat Location #1 2.0 Mi, N Milk 24-C Goat Location #3 29.0 Mi, NNW Milk 25-1 Within 10 Miles Nearest garden Fruits & Vegetables 26-C Beyond 10 Miles Beyond 10 Fruits & Vegetables, Vegetation Miles 27-1 Niantic 1.7 Mi, WNW TLD, Air Particulate, Iodine 28-1 Two Tree Island 0.8 Mi, SSE Mussels 29-1 West Jordan Cove 0.4 Mi, NNE Clams, Fish***

29-X West Jordan Cove 0.4 Mi, NNE Fucus 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, Oysters, Lobster, Fish***, 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 34-X Thames River Yacht club 4.0 Mi, ENE Oysters 35-1 Niantic Bay 0.3 Mi, WNW Lobster, Fish***

35-X Niantic Bay 0.3 Mi, WNW Mussels, 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

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

- The release points are the Site Stack for terrestrial locations and the quarry cut for aquatic locations.

- - Flounder and another type of fish, each required to be sampled at two separate locations.

2-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Location Direction & Distance Number* Location Name From Release Point** Sample Types 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 Lyme - 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 & 0.5 Mi, NE TLD Shotgun 76-X ISFSI-1 Up-gradient of ISFSI Well Water 77-X ISFSI-2A Down-gradient of ISFSI Well Water 78-X ISFSI-3 Down-gradient of ISFSI Well Water 79-1 M3-MW-1 Onsite Well Water 80-1 S1 2-MW-2 Onsite Well Water 81-1 S2-MW-1 Onsite Well Water 82-1 MW-GPI-2 Onsite Well Water 88-1 DEEP Dock Onsite Oysters 90-X Thames River 4 Mi, E Fucus

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

- The release points are the Site Stack for terrestrial locations and the quarry cut for aquatic locations.

2-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Table 2-2 Required Samplinq Frequencv & Tvpe of Analysis Exposure Pathway No. of Sampling & Collection Type of Analysis andlor Sample Locations Frequency

1. Gamma Dose - 3 9 a Quarterly Gamma Dose - Quarterly Environmental TLD

2. Airborne Particulate 8 Continuous sampler - weekly Gross Beta - Weekly filter change Gamma Spectrum - Quarterly on 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 1-131 - Weekly canister change

4. Vegetation 5 One sample near middle and Gamma Isotopic on each sample one near end of growing season

5. Milk 2 Semimonthly when animals are Gamma Isotopic and 1-131 on each on pasture; monthly at other sample; Sr-89 and Sr-90 on times. quarterly composite 5a. Pasture Grass 2 Sample as necessary to Gamma Isotopic and 1-131 on each substitute for unavailable milk sample

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

location. Quarterly at control location - Composite of 6 weekly grab samples.

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

8. Bottom Sediment 5 Semiannual Gamma Isotopic on each sample

9. Soil 3 Annually Gamma Isotopic on each sample

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

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

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

13. Clams 2 Quarterly Gamma Isotopic on each sample (edible portion)

14. Lobster 2 Quarterly Gamma Isotopic on each sample I (edible portion) I I I (a) Two or more TLDs or TLD with two or more elements per location.

2-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 2.2 Samples Collected Durinq Report Period The following table summarizes the number of samples of each type collected and analyzed during 2012:

Number of Number of Technical Technical Specification Specification Number of Sample Type Required Samples Required Samples Extra Samples Analyzed Analyzed Gamma Exposure 156 1541 18 (Environmental TLD)

Air Particulates 416 4141 0 Air Iodine 416 4141 0 Soil 3 3 0 Cow and Goat Milk 40 02 18 Pasture Grass/Feed 3 Variable 40 0 Fruit and Vegetables 0 0 10 Broad Leaf Vegetation 10 10 16 Well Water 12 12 20 Sea Water 16 16 0 Bottom Sediment 10 10 4 Aquatic Flora 0 0 20 Fish 16 104 2 Mussels 8 34 1 Oysters 16 16 2 Clams 8 8 0 Lobster 8 8 0 Total All Types 1,135 1,118 111 1 See notes at end of Section 3 for details on loss of some TLDs and air samples.

2 Pasture grass or feed sampled as necessary to substitute for unavailable milk.

3 Depends upon availability of milk samples 4 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 2012

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. There were no non-routine measurements in 2012.

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 that are not evident in the Summary Table because of the basic limitation of data summaries. The data summaries include the extra ("X") samples 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 2012 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2012 Medium or Indicator Control Pathway Analysis Total LLD' Locations Location with Highest Mean Locations Sampled Type Number Mean Distance Mean Mean (Units) (Range) NumberI Direction (Range) (Range)

Direct Gamma 174 NA 7.9 8 0.3 Mile 11.5 8.1 Radiation Dose (6.1 -11.8) SE (11.1 - 11.8) (6.0-10.0)

TLD (uR/hr)

Air Iodine 1-131 414 0.07 <LLD NA NA <LLD <LLD (pCi/rm ')

Air Particulate GR-B 414 0.01 0.0148 15 14.0 Miles 0.0155 0.0155 (pCi/m ) (0.0036 - 0.0376) N (0.0045 - 0.0429) (0.0045 - 0.0429)

GAMMA 32 Be-7 NA 0.115 15 14.0 Miles 0.135 0.135 (0.074 - 0.170) N (0.100 - 0.175) (0.100 - 0.175)

Other Note 2 <LLD NA NA <LLD <LLD Gammas Soil GAMMA 3 (pCi/g dry) Be-7 NA <LLD 14 12.0 Miles 0.540 0.540 NE K-40 NA 16.5 3 0.3 Mile 18.4 13.4 (14.7 - 18.4) NE Cs-137 0.18 0.431 14 12.0 Miles 1.466 1.466 (0.226 - 0.636) NE Other Note 3 <LLD NA NA <LLD <LLD Gammas Milk Sr-89 5 NA <LLD NA NA <LLD NA (pCi'I)

Sr-90 5 NA <LLD NA NA <LLD NA GAMMA 18 K-40 NA 1269 22 10.5 Miles 1308 NA (1129 - 1424) WNW (1161 - 1424)

Other Note 4 <LLD NA NA <LLD NA Gammas Pasture GAMMA 40 GrasslHay Be-7 NA 0.67 24 29.0 Miles 1.13 1.13 (pCi/g wet) (0.00 - 2.61) NNW (0.00 - 2.74) (0.00 - 2.74)

K-40 NA 7.86 21 2.0 Miles 7.86 7.63 (3.44 - 17.8) N (3.44- 17.8) (4.57- 17.7)

Cs-1 37 0.08 Note 5 24 29.0 Miles Note 6 Note 6 NNW Other Note 7 <LLD NA NA <LLD <LLD Gammas 3-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2012 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)

Fruits & GAMMA 8 Vegetables Be-7 NA 0.135 25 <10 Miles 0.135 0.201 (pCi/g wet) (0.000 - 0.290) (0.000 - 0.290)

K-40 NA 2.77 26 >10 Miles 3.69 3.69 (0.670 - 5.12) (0.975 - 7.65) (0.975 - 7.65)

Other Note 10 <LLD NA NA <LLD <LLD Gammas Broad Leaf GAMMA 24 Vegetation Be-7 NA 1.12 01 0.6 Mile 1.4 1.33 (pCi/g wet) (0.479 - 1.85) NNW (1.01 - 1.77) (0.678 - 2.24)

K-40 NA 3.59 10 1.2 Miles 2.95 3.92 (2.50 - 4.71) E (3.04 - 4.71) (3.10 - 4.78)

Cs-137 0.08 Note 11 17 0.5 Mile 0.042 <LLD NE Other Note 10 <LLD NA NA <LLD <LLD Gammas Well Water H-3 32 2000 <LLD NA NA <LLD NA (pCi/l)

GAMMA 32 K-40 NA Note 8 NA Onsite Note 8 NA Other Note 9 <LLD NA NA <LLD <LLD Gammas Sea Water H-3 15 3000 345 32 < 0.1 Mile 345 <LLD (pCi/I) (0-1180) (0-1180)

GAMMA 15 K-40 NA 259 32 < 0.1 Mile 259 237 (230- 357) (230- 357 (215 - 260)

Other Note 9 <LLD NA NA <LLD <LLD Gammas Bottom GAMMA 14 Sediment K-40 NA 17.1 67 4.7 Miles 22.9 19.9 (pCi/gdry) (14.6 - 20.5) NNW (22.5 - 23.3) (16.5 - 23.3)

Cs-137 0.18 Note 12 32 < 0.1 Mile 0.141 (1/2) <LLD Other Note 3 <LLD NA NA <LLD <LLD Gammas 3-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2012 (pCi/g wet) Be-7 NA Note 13 29 0.4 Mile 0.137 Note 14 NNE (0- 0.265)

K-40 NA 7.07 32 < 0.1 Mile 7.97 6.54 (5.93 - 8.74) (6.45 - 8.74) (5.60- 7.9 1) 1-131 0.06 Note 15 90 4.0 Mile Note 15 <LLD E

Other Note 16 <LLD NA NA <LLD NA Gammas Fish - GAMMA 6 Flounder K-40 NA 4.6 32 < 0.1 Mile 4.9 NA (pCi/g wet) (4.1 -5.0) (4.8-5.0)

Other Note 17 <LLD NA NA <LLD NA Gammas Fish - Other GAMMA 6 (pCi/g wet) K-40 NA 4.4 29 0.4 Mile 4.4 NA (3.6-5.2) NNE Other Note 17 <LLD NA NA <LLD NA Gammas Mussels GAMMA 4 (pCi/g wet) K-40 NA 1.5 30 1.5 Miles 1.5 NA (0.9-2.3) NNW (0.9-2.3)

Other Note 17 <LLD NA NA <LLD NA Gammas Oysters GAMMA 18 (pCi/g wet) K-40 NA 2.0 31 1.8 Miles 2.2 1.6 (1.5-2.5) NW (1.7/2.5) (1.5-2.1)

Ag-1 10M NA Note 18 32 < 0.1 Mile Note 18 <LLD Other Note 17 <LLD NA NA <LLD <LLD Gammas Clams GAMMA 8 (pCi/g wet) K-40 NA 2.1 29 0.4 Mile 2.2 NA (1.8-2.5) NNE (1.9-2.5)

Other Note 17 <LLD NA NA <LLD NA Gammas Lobster GAMMA 8 (pCi/g wet) K-40 NA 2.8 35 0.3 Mile 3.1 NA (2.1 -3.3) WNW (2.9- 3.3)

Other Note 17 <LLD NA NA <LLD NA Gammas 3-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 - LLDs for milk other gamma are 1 pCi/I for 1-131, 15 pCi/I for Cs-134, 18 pCi/I for Cs-137, 70 pCi/I for Ba-140 and 25 pCi/I for La-140.

5 - Two samples of pasture grass/hay out of 20 had positive Cs-137 results, with 0.017 and 0.019 pCi/g.

6 - Three samples of pasture grass/hay out of 20 had positive Cs-1 37 results, with 0.035, 0.081 and 0.098 pCi/g.

7 - LLD for grass/hay other gamma is 0.15 pCi/g for Cs-1 34.

8 - One well water had positive K-40 of 43 pCi/I.

9- 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-1 37 and 60 pCi/I for Ba-140.

10 - LLDs for fruits&vegetables and broadleaf vegetation other gamma are 0.06 pCi/M 3 for 1-131, 0.05 pCi/M 3 for Cs-1 34 and 0.08 pCi/M3 for Cs-1 37.

11 - Three samples of broadleaf vegetation out of 18 had positive Cs-1 37 results, with 0.016, 0.032 and 0.042 pCi/g.

12 - Six samples of bottom sediment out of 14 had positive Cs-137 results with 0.085, 0.092, 0.146, 0.178, 0.187 and 0.265 pCi/g.

13 - One flora control out of 4 had positive Be-7 of 0.093 pCi/g.

14 - Two flora samples out of 12 had positive 1-131 results with 0.024 and 0.037 pCi/g.

15 - Two flora samples out of 4 had positive 1-131 results with 0.131 and 0.355 pCi/g.

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

17 - LLDs for fish and shellfish other gamma are 0.13 pCi/g for Mn-54, Co-58, Co-60 and Cs-134; 0.26 pCi/g for Fe-59 and Zn-65; and 0.15 pCi/g for Cs-1 37.

18 - Two oyster samples out of nine had positive Ag-1 10m results with 0.084 and 0.335 pCi/g.

3-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 kt 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 2012 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 2y error (i.e., the measured value exceeds 3c). 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.

3-7

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 1 QUARTERLY GAMMA EXPOSURE RATE (uR/hr)*

LOCATIONS PERIOD 2 3 4 5 6 7 8 9 10 11

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

1Q 8.6 0.3 10.4 0.4 7.4 0.3 8.2 0.3 9.8 0.3 8.2 0.3 7.1 0.4 11.6 0.3 8.9 0.3 11.1 0.3 6.8 0.3 2Q 7.7 0.6 10.0 0.6 7.3 0.4 7.7 0.4 9.7 0.6 7.5 0.4 6.1 0.4 11.1 0.6 8.6 0.5 9.8 0.6 6.4 0.4 3Q 8.7 0.3 10.5 0.5 7.9 0.3 8.6 0.3 10.6 0.3 8.6 0.4 6.4 0.4 11.8 0.5 9.9 0.4 10.8 0.4 7.4 0.3 4Q 8.5 0.3 10.4 0.4 7.6 0.3 7.8 0.4 9.5 0.4 9.4 0.4 See note A 11.6 0.4 10.2 0.4 10.5 0.4 7.1 0.3 PERIOD 12C 13C 14C 15C 16C 27 41 42 43 44 45

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

1Q See note B See note A 10.0 0.3 8.1 0.3 6.6 0.2 8.5 0.5 7.0 0.3 7.6 0.3 7.2 0.3 8.8 0.3 7.7 0.3 2Q See note B 9.9 0.6 8.9 0.6 7.4 0.4 6.0 0.4 7.6 0.5 6.7 0.4 7.0 0.5 7.0 0.4 7.7 0.4 6.9 0.4 3Q 7.5 0.3 9.2 0.3 9.8 0.4 8.4 0.3 6.2 0.3 8.6 0.3 7.1 0.3 7.6 0.4 7.0 0.3 8.2 0.4 7.5 0.3 4Q 7.5 0.3 8.7 0.3 9.4 0.5 7.8 0.3 6.2 0.2 8.1 0.4 7.2 0.3 7.6 0.3 6.9 0.3 8.4 0.4 7.5 0.3 PERIOD 46 47 48 49 50 51 52 53 55 56 57

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

1Q 9.5 0.4 8.1 0.4 9.7 0.3 7.1 0.4 8.3 0.3 6.5 0.2 7.2 0.3 7.7 0.2 8.1 0.3 7.2 0.3 7.3 0.5 2Q 8.5 0.6 7.5 0.4 8.8 0.5 6.6 0.4 7.6 0.6 6.3 0.4 6.9 0.4 7.3 0.4 7.2 0.4 7.1 0.5 6.7 0.4 3Q 8.6 0.5 8.1 0.4 9.5 0.3 7.4 0.3 7.7 0.5 6.4 0.2 6.9 0.4 7.5 0.2 7.5 0.4 7.1 0.3 7.3 0.3 4Q 8.7 0.4 7.9 0.3 9.4 0.3 6.8 0.4 8.0 0.3 6.5 0.3 7.0 0.3 7.4 0.3 7.9 0.3 7.1 0.3 7.6 0.4 PERIOD 59 60 61 62 63 64 65 66 73 74 75

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

1Q 8.0 0.3 6.8 0.3 7.6 0.3 8.4 0.3 8.8 0.4 7.4 0.3 8.2 0.3 7.7 0.3 10.0 0.4 7.9 0.3 7.1 0.3 2Q 7.3 0.5 6.6 0.4 7.2 0.4 8.0 0.4 7.9 0.5 6.8 0.4 7.8 0.4 7.0 0.4 9.2 0.5 7.4 0.4 6.9 0.5 3Q 8.5 0.3 6.6 0.3 7.3 0.2 8.1 0.4 8.8 0.3 8.0 0.3 7.9 0.3 7.3 0.4 8.8 0.3 7.8 0.4 7.1 0.3 4Q 7.9 0.3 6.7 0.3 7.5 0.4 8.0 0.3 8.7 0.3 7.6 0.4 8.3 0.3 7.1 0.4 7.6 0.3 7.5 0.3 6.6 0.3

READINGS ARE THE AVERAGE OF MULTI CASO4TM PHOSPHOR ELEMENTS WITHIN ONE PANASONIC TLD BADGE ERRORS ARE 1 SIGMA AND INCLUDE COUNTING, TRANSIT, READER AND FADE UNCERTAINTIES A - TLD was lost during a storm.

B - TLD was lost when the utility pole on which it was mounted was replaced.

3-8

Domidnion Nuclear Connecticut, Inc. Annual Radiological Enviromnmental Operating Report Millstone Power Station 2012 TABLE 2 AIR PARTICULATES GROSS BETA RADIOACTIVITY (pCi/md)

LOCATIONS PERIOD ENDING 01 02 03 04 10 27 15SC 0.191.0 01/10/12 0.016 0.004 0.017 0.004 0.015 0.004 0.015 0.004 0.014 0.004 0.016 0.004 0.016 0.004 0.019 0.004 01/17/12 0.009 0.003 0.013 0.003 0.016 0.003 0.016 0.003 0.013 0.003 0.012 0.003 0.011 0.003 0.011 0.003 01/24/12 0.014 0.003 0.017 0.004 0.017 0.004 0.017 0.004 0.013 0.003 0.015 0.004 0.015 0.004 0.017 0.004 01/31/12 0.015 0.003 0.014 0.003 0.014 0.003 0.014 0.003 0.017 0.003 0.017 0.003 0.014 0.003 02/07/12 0.017 0.003 0.016 0.003 0.017 0.003 0.019 0.004 0.019 0.004 0.018 0.003 0.021 0.004 0.015 0.003 02/14/12 0.016 0.003 0.016 0.003 0.015 0.003 0.016 0.003 0.012 0.003 0.015 0.003 0.018 0.004 0.012 0.003 02/21/12 0.018 0.004 0.018 0.004 0.017 0.004 0.015 0.004 0.017 0.004 0.020 0.004 0.018 0.004 0.018 0.004 02/28/12 0.016 0.003 0.015 0.003 0.015 0.003 0.017 0.003 0.017 0.003 0.015 0.003 0.015 0.003 0.015 0.003 03/06/12 0.012 0.003 0.013 0.003 0.014 0.003 0.016 0.003 0.014 0.003 0.014 0.003 0.015 0.003 0.013 0.003 03/13/12 0.017 0.003 0.013 0.003 0.016 0.003 0.015 0.003 0.016 0.003 0.016 0.003 0.016 0.003 0.013 0.003 03/20/12 0.014 0.003 0.012 0.003 0.014 0.003 0.014 0.003 0.014 0.003 0.014 0.003 0.014 0.003 0.016 0.003 03/27/12 0.013 0.004 0.015 0.003 0.016 0.004 0.013 0.003 0.012 0.003 0.013 0.004 0.013 0.003 0.017 0.004 04/03/12 0.012 0.003 0.013 0.003 0.012 0.003 0.012 0.003 0.009 0.003 0.011 0.003 0.011 0.003 0.012 0.003 04/10/12 0.013 0.004 0.017 0.004 0.015 0.004 0.015 0.004 0.012 0.003 0.015 0.004 0.016 0.004 0.014 0.004 04/17/12 0.016 0.003 0.016 0.003 0.016 0.003 0.025 0.004 0.018 0.003 0.018 0.003 0.017 0.003 0.018 0.003 04/24/12 0.007 0.003 0.007 0.003 0.006 0.003 0.007 0.003 0.010 0.002 0.005 0.003 0.009 0.003 0.007 0.003 05/01/12 0.019 0.003 0.017 0.003 0.017 0.003 0.016 0.003 0.019 0.003 0.019 0.003 0.021 0.004 0.017 0.003 05/08/12 0.004 0.003 0.006 0.003 0.006 0.003 0.005 0.003 0.005 0.003 0.007 0.003 0.007 0.003 0.005 0.003 05/15/12 0.013 0.003 0.012 0.003 0.016 0.003 0.013 0.003 0.015 0.003 0.012 0.003 0.015 0.003 0.013 0.003 05/22/12 0.008 0.003 0.014 0.003 0.011 0.003 0.008 0.003 0.012 0.003 0.012 0.003 0.010 0.003 0.013 0.003 05/29/12 0.006 0.003 0.008 0.003 0.005 0.003 0.007 0.003 0.006 0.003 0.005 0.002 0.006 0.003 0.007 0.003 06/05/12 0.011 0.003 0.009 0.003 0.012 0.003 0.011 0.003 0.011 0.003 0.009 0.003 0.010 0.003 0.009 0.003 06/12/12 0.010 0.003 0.011 0.003 0.011 0.003 0.010 0.003 0.008 0.003 0.010 0.003 0.007 0.003 0.011 0.003 06/19/12 0.010 0.003 0.009 0.003 0.009 0.003 0.010 0.003 0.007 0.003 0.009 0.003 0.010 0.003 0.008 0.003 06/26/12 0.016 0.003 0.015 0.003 0.016 0.003 0.015 0.003 0.016 0.003 0.019 0.003 0.016 0.003 0.018 0.003 07/03/12 0.017 0.003 0.014 0.003 0.016 0.003 0.016 0.003 0.021 0.004 0.016 0.003 0.018 0.004 0.019 0.004 3-9

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 2 AIR PARTICULATES GROSS BETA RADIOACTIVITY (pCi/m")

LOCATIONS PERIOD ENDING 01 02 03 04 10 11 27 15C 07/10/12 0.015 0.004 0.015 0.004 0.016 0.004 0.015 0.004 0.016 0.004 0.019 0.004 0.016 0.004 0.020 0.004 07/17/12 0.016 0.003 0.017 0.003 0.016 0.003 0.020 0.004 0.020 0.004 0.019 0.003 0.017 0.004 0.016 0.003 07/24/12 0.015 0.004 0.014 0.004 0.018 0.004 0.014 0.004 0.013 0.004 0.012 0.003 0.013 0.004 0.016 0.004 07/31/12 0.015 0.003 0.013 0.003 0.015 0.003 0.015 0.003 0.014 0.003 0.014 0.003 0.013 0.003 0.014 0.003 08/07/12 0.014 0.003 0.016 0.003 0.015 0.003 0.014 0.003 0.016 0.003 0.017 0.003 0.016 0.003 0.016 0.003 08/14/12 0.014 0.003 0.010 0.003 0.015 0.003 0.013 0.003 0.015 0.003 0.016 0.003 0.012 0.003 0.015 0.003 08/21/12 0.015 0.003 0.016 0.003 0.018 0.003 0.017 0.003 0.014 0.003 0.016 0.003 0.016 0.004 0.021 0.004 08/28/12 0.018 0.003 0.024 0.004 0.020 0.004 0.021 0.004 0.018 0.003 0.021 0.003 0.020 0.003 0.023 0.004 09/04/12 0.016 0.004 0.017 0.004 0.015 0.004 0.020 0.004 0.019 0.004 0.017 0.004 0.020 0.004 0.018 0.004 09/11/12 0.015 0.003 0.015 0.003 0.013 0.003 0.016 0.003 0.014 0.003 0.014 0.003 0.015 0.003 0.015 0.003 09/18/12 0.013 0.004 0.014 0.003 0.015 0.004 0.013 0.004 0.014 0.004 0.013 0.003 0.014 0.003 0.017 0.004 09/25/12 0.012 0.003 0.011 0.003 0.014 0.003 0.012 0.003 0.011 0.003 0.012 0.003 0.008 0.003 0.012 0.003 10/02/12 0.015 0.004 0.014 0.003 0.014 0.003 0.015 0.003 0.014 0.003 0.015 0.003 0.015 0.003 0.016 0.004 10/09/12 0.020 0.004 0.020 0.004 0.019 0.004 0.020 0.004 0.017 0.004 0.021 0.004 0.020 0.004 0.022 0.004 10/16/12 0.013 0.003 0.010 0.003 0.010 0.003 0.013 0.003 0.013 0.003 0.013 0.003 0.012 0.003 0.013 0.003 10/23/12 0.016 0.003 0.015 0.003 0.016 0.003 0.017 0.003 0.015 0.003 0.016 0.003 0.015 0.003 0.016 0.004 10/28/12 0.011 0.004 0.016 0.004 0.018 0.004 0.010 0.004 0.017 0.004 0.016 0.004 0.023 0.005 0.017 0.004 11/06/12 0.007 0.002 0.007 0.001 0.009 0.002 0.013 0.009 0.007 0.002 0.007 0.002 0.005 0.001 0.006 0.001 11/13/12 0.015 0.003 0.017 0.003 0.017 0.003 See Note C 0.021 0.004 0.018 0.003 0.020 0.003 0.023 0.004 11/20/12 0.023 0.004 0.020 0.003 0.019 0.003 See Note C 0.021 0.004 0.018 0.003 0.020 0.003 0.022 0.004 11/27/12 0.019 0.004 0.023 0.004 0.023 0.004 0.026 0.004 0.026 0.004 0.022 0.004 0.024 0.004 0.025 0.004 12/04/12 0.027 0.004 0.029 0.004 0.028 0.004 0.031 0.004 0.038 0.005 0.025 0.004 0.037 0.004 0.043 0.005 12/11/12 0.014 0.003 0.011 0.003 0.013 0.003 0.012 0.003 0.016 0.004 0.014 0.003 0.014 0.003 0.016 0.004 12/18/12 0.015 0.003 0.016 0.003 0.013 0.003 0.015 0.003 0.017 0.003 0.015 0.003 0.016 0.003 0.018 0.004 12/26/12 0.013 0.003 0.013 0.003 0.010 0.003 0.012 0.003 0.017 0.003 0.013 0.003 0.010 0.003 0.009 0.003 01/02/13 0.014 0.003 0.014 0.003 0.014 0.003 0.011 0.003 0.014 0.003 0.024 0.004 0.017 0.003 0.014 0.004 C - Air Particulates and lodines had loss of power at Location #4 during November due to a storm. Temporary power was used starting in late November and permanent power was restored later in the year.

3-10

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 3 AIRBORNE IODINE (pCi/ma)

LOCATIONS PERIOD ENDING 01 02 03 04 10 11 15C 27 01/10/12 -0.002 0.024 -0.002 0.022 -0.002 0.024 -0.002 0.026 0.006 0.029 0.005 0.028 0.006 0.028 0.006 0.032 01/17/12 0.000 0.023 0.000 0.021 0.000 0.023 0.000 0.025 -0.011 0.022 -0.011 0.022 -0.010 0.022 -0.012 0.025 01/24/12 0.011 0.018 0.011 0.018 0.011 0.019 0.013 0.021 0.001 0.024 0.001 0.023 0.001 0.024 0.001 0.027 01/31/12 -0.017 0.024 -0.016 0.022 -0.017 0.024 -0.019 0.027 -0.010 0.031 -0.010 0.030 -0.010 0.031 -0.011 0.035 02/07/12 0.013 0.022 0.011 0.020 0.013 0.023 0.014 0.025 0.015 0.028 0.014 0.026 0.015 0.027 0.017 0.031 02/14/12 0.024 0.027 0.022 0.025 0.025 0.026 0.026 0.029 -0.013 0.033 -0.013 0.032 -0.014 0.034 -0.018 0.045 02/21/12 -0.002 0.036 -0.002 0.033 -0.002 0.037 -0.003 0.041 -0.013 0.031 -0.012 0.029 -0.013 0.030 -0.015 0.035 02/28/12 0.001 0.023 0.001 0.020 0.001 0.023 0.001 0.022 0.004 0.027 0.004 0.026 0.004 0.027 0.004 0.025 03/06/12 0.001 0.018 0.000 0.016 0.001 0.019 0.001 0.018 0.009 0.016 0.008 0.015 0.009 0.016 0.008 0.015 03/13/12 0.018 0.021 0.016 0.019 0.019 0.022 0.018 0.021 0.004 0.017 0.004 0.016 0.004 0.018 0.004 0.017 03/20/12 0.017 0.035 0.015 0.031 0.017 0.036 0.016 0.034 0.003 0.030 0.003 0.029 0.003 0.031 0.003 0.029 03/27/12 0.004 0.028 0.003 0.026 0.004 0.030 0.004 0.028 -0.009 0.034 -0.009 0.033 -0.009 0.034 -0.009 0.033 04/03/12 0.013 0.023 0.012 0.020 0.014 0.023 0.013 0.022 -0.023 0.029 -0.022 0.028 -0.024 0.030 -0.023 0.029 04/10/12 0.017 0.024 0.015 0.021 0.017 0.025 0.016 0.023 0.019 0.022 0.018 0.021 0.019 0.022 0.018 0.021 04/17/12 -0.011 0.035 -0.010 0.031 -0.012 0.036 -0.011 0.033 -0.015 0.028 -0.014 0.027 -0.015 0.028 -0.014 0.027 04/24/12 -0.008 0.031 -0.007 0.027 -0.008 0.033 -0.007 0.029 -0.001 0.032 -0.001 0.031 -0.001 0.033 -0.001 0.031 05/01/12 0.018 0.028 0.019 0.028 0.019 0.028 0.019 0.028 0.000 0.028 0.000 0.028 0.000 0.028 0.000 0.027 05/08/12 0.016 0.029 0.018 0.031 0.017 0.029 0.016 0.029 -0.009 0.032 -0.009 0.033 -0.010 0.033 -0.009 0.032 05/15/12 0.017 0.033 0.017 0.033 0.017 0.033 0.017 0.033 -0.016 0.021 -0.016 0.021 -0.017 0.022 -0.017 0.022 05/22/12 0.009 0.035 0.009 0.035 0.010 0.036 0.010 0.036 -0.024 0.031 -0.024 0.031 -0.026 0.033 -0.025 0.032 05/29/12 -0.013 0.031 -0.013 0.032 -0.013 0.032 -0.013 0.031 0.001 0.025 0.001 0.025 0.001 0.025 0.001 0.025 06/05/12 0.018 0.036 0.018 0.035 0.018 0.036 0.018 0.035 -0.011 0.039 -0.011 0.038 -0.012 0.040 -0.012 0.041 06/12/12 0.005 0.026 0.005 0.025 0.005 0.026 0.005 0.025 -0.016 0.023 -0.015 0.022 -0.017 0.024 -0.017 0.024 06/19/12 -0.010 0.031 -0.009 0.031 -0.010 0.031 -0.009 0.030 -0.008 0.027 -0.007 0.026 -0.008 0.027 -0.008 0.027 06/26/12 0.029 0.036 0.028 0.034 0.029 0.035 0.028 0.034 -0.013 0.043 -0.013 0.042 -0.011 0.042 -0.013 0.044 07/03/12 -0.006 0.028 -0.006 0.027 -0.006 0.028 -0.006 0.027 -0.030 0.036 -0.029 0.035 -0.032 0.038 -0.033 0.039 3-11

Dom-inion Nuclear Connecticut, Inc. Annual Radiological Envirornmental Operating Report Millstone Power Station 2012 TABLE 3 AIRBORNE IODINE (pCi/ma)

LOCATIONS PERIOD ENDING 01 02 03 04 10 11 15C 27 07/10/12 -0.028 0.044 -0.027 0.043 -0.027 0.043 -0.027 0.043 -0.054 0.037 -0.050 0.034 -0.054 0.037 -0.055 0.037 07/17/12 0.007 0.022 0.006 0.022 0.007 0.023 0.006 0.021 -0.023 0.027 -0.021 0.025 -0.023 0.027 -0.023 0.027 07/24/12 0.011 0.029 0.010 0.028 0.011 0.029 0.010 0.028 0.007 0.015 0.007 0.014 0.007 0.015 0.007 0.015 07/31/12 -0.025 0.036 023 0.033 -0.024 0.035 -0.023 0.034 0.011 0.038 0.011 0.036 0.012 0.041 0.012 0.041 08/07/12 -0.008 0.016 -0.008 0.016 -0.009 0.018 -0.008 0.017 -0.004 0.019 -0.004 0.018 -0.005 0.019 -0.005 0.019 08/14/12 -0.004 0.035 -0.004 0.032 -0.004 0.035 -0.004 0.033 -0.003 0.034 -0.003 0.033 -0.003 0.035 -0.003 0.036 08/21/12 -0.007 0.026 -0.006 0.023 -0.007 0.026 -0.007 0.025 -0.019 0.018 -0.018 0.017 -0.020 0.019 -0.020 0.019 08/28/12 0.003 0.038 0.003 0.037 0.003 0.040 0.003 0.037 -0.013 0.017 -0.013 0.016 -0.014 0.017 -0.014 0.018 09/04/12 0.005 0.040 0.005 0.037 0.005 0.038 0.005 0.038 -0.021 0.033 -0.020 0.031 -0.022 0.034 -0.020 0.031 09/11/12 0.001 0.019 0.001 0.017 0.001 0.017 0.001 0.018 0.006 0.025 0.006 0.024 0.007 0.028 0.006 0.024 09/18/12 0.011 0.023 0.010 0.022 0.011 0.022 0.011 0.023 -0.015 0.021 -0.014 0.020 -0.016 0.022 -0.014 0.020 09/25/12 -0.013 0.025 -0.012 0.023 -0.012 0.024 -0.013 0.025 0.000 0.025 0.000 0.024 0.000 0.028 0.000 0.025 10/02/12 -0.003 0.037 -0.002 0.032 -0.002 0.034 -0.002 0.034 0.016 0.034 0.015 0.031 0.017 0.035 0.015 0.030 10/09/12 0.010 0.028 0.009 0.025 0.009 0.026 0.010 0.028 -0.008 0.036 -0.008 0.033 -0.009 0.039 -0.008 0.034 10/16/12 0.019 0.030 0.017 0.026 0.017 0.027 0.018 0.028 -0.004 0.026 -0.003 0.025 -0.004 0.029 -0.004 0.026 10/23/12 -0.010 0.031 -0.009 0.027 -0.009 0.029 -0.009 0.029 0.008 0.025 0.007 0.024 0.008 0.028 0.007 0.025 10/28/12 0.001 0.030 0.000 0.028 0.001 0.030 0.001 0.030 0.001 0.025 0.001 0.024 0.001 0.025 0.001 0.024 11/06/12 0.013 0.019 0.009 0.013 0.021 0.030 0.005 0.037 0.013 0.041 0.010 0.031 0.008 0.024 0.006 0.020 11/13/12 -0.003 0.028 -0.003 0.024 -0.003 0.025 See Note C -0.003 0.027 0.005 0.017 0.005 0.019 0.005 0.017 11/20/12 0.018 0.040 0.015 0.034 0.016 0.036 See Note C 0.017 0.037 -0.012 0.025 -0.014 0.029 -0.012 0.025 11/27/12 -0.018 0.033 -0.015 0.028 -0.016 0.029 -0.017 0.030 0.012 0.022 0.011 0.021 0.013 0.024 0.011 0.021 12/04/12 0.000 0.022 0.000 0.019 0.000 0.019 0.000 0.021 -0.004 0.011 -0.004 0.010 -0.004 0.012 -0.004 0.011 12/11/12 -0.007 0.026 -0.006 0.022 -0.007 0.024 -0.007 0.025 -0.007 0.031 -0.006 0.028 -0.007 0.032 -0.006 0.028 12/18/12 0.004 0.038 0.004 0.038 0.004 0.035 0.009 0.043 -0.021 0.040 -0.021 0.040 -0.002 0.036 -0.022 0.042 12/26/12 0.000 0.001 0.000 0.001 0.000 0.001 0.000 0.001 0.000 0.001 0.000 0.001 0.000 0.001 0.000 0.001 01/02/13 -0.024 0.023 -0.024 0.023 -0.022 0.022 -0.022 0.021 0.028 0.022 0.027 0.021 0.033 0.026 0.028 0.022 C - Air Particulates and Jodines had loss of power at Location #4 during November due to a storm. Temporary power was used starting in late November and permianent power was restored later in the year.

3-12

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 4 AIR PARTICULATES (pCi/m3)

GAMMA SPECTRA - QTR 1 (01/03/12 - 04103112)

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

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

(+/-)

01 0.154 0.042 0.0018 0.0014 0.0013 0.0023 0.0002 0.0014 -0.0007 0.0032 -0.0010 0.0023 0.0005 0.0048 02 0.119 0.034 0.0006 0.0009 0.0009 0.0020 -0.0002 0.0011 0.0010 0.0025 -0.0011 0.0021 0.0012 0.0026 03 0.109 0.038 -0.0002 0.0009 -0.0008 0.0017 -0.0002 0.0008 0.0009 0.0022 0.0010 0.0013 0.0011 0.0028 04 0.152 0.039 0.0005 0.0015 -0.0024 0.0029 0.0012 0.0017 0.0004 0.0033 0.0020 0.0030 -0.0020 0.0055 10 0.093 0.049 -0.0010 0.0020 -0.0001 0.0035 -0.0007 0.0022 0.0038 0.0052 0.0002 0.0040 0.0023 0.0075 11 0.170 0.041 0.0000 0.0016 0.0007 0.0027 -0.0001 0.0014 0.0032 0.0032 0.0004 0.0027 0.0021 0.0047 27 0.144 0.037 0.0006 0.0010 0.0015 0.0024 0.0008 0.0013 0.0006 0.0031 0.0011 0.0020 -0.0014 0.0036 15C 0.175 0.049 0.0008 0.0018 0.0002 0.0035 0.0009 0.0016 0.0006 0.0040 -0.0024 0.0037 -0.0013 0.0067 LOCATION Ru-103 Ru-106 Cs-134 Cs-137 Ba-140 Ce-141 Ce-144

(*0-) (+1-) (.1-) (+/-) (+/-)

01 -0.0009 0.0044 -0.0039 0.0111 0.0000 0.0010 -0.0003 0.0009 -0.1807 0.4277 -0.0008 0.0085 -0.0057 0.0070 02 -0.0006 0.0034 -0.0085 0.0101 -0.0003 0.0010 -0.0007 0.0008 0.3542 0.3459 -0.0028 0.0061 -0.0005 0.0054 03 -0.0006 0.0024 0.0000 0.0067 0.0000 0.0008 -0.0002 0.0006 0.0000 0.0000 -0.0025 0.0043 0.0007 0.0029 04 0.0001 0.0048 0.0043 0.0145 0.0007 0.0013 0.0010 0.0011 0.1154 0.4677 0.0008 0.0072 0.0042 0.0065 10 0.0003 0.0061 0.0040 0.0160 0.0015 0.0018 0.0008 0.0016 0.0496 0.5617 0.0034 0.0088 -0.0024 0.0063 11 -0.0035 0.0042 -0.0036 0.0139 -0.0004 0.0017 -0.0020 0.0014 -0.1067 0.4266 -0.0007 0.0078 -0.0044 0.0057 27 -0.0031 0.0041 -0.0030 0.0099 0.0006 0.0011 0.0001 0.0010 0.1460 0.3337 -0.0045 0.0065 -0.0003 0.0052 15C -0.0018 0.0063 -0.0105 0.0153 0.0020 0.0018 0.0009 0.0015 0.0956 0.5693 -0.0077 0.0098 0.0004 0.0093 GAMMA SPECTRA - OTR 2 (04103/12 - 07/03/12)

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

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

1 0.085 0.033 0.0004 0.0011 -0.0008 0.0017 0.0003 0.0012 0.0020 0.0029 0.0010 0.0018 -0.0025 0.0030 2 0.121 0.033 0.0004 0.0008 -0.0008 0.0020 0.0011 0.0013 0.0018 0.0029 0.0008 0.0028 -0.0014 0.0039 3 0.104 0.032 -0.0012 0.0013 -0.0007 0.0021 0.0002 0.0012 -0.0013 0.0027 0.0002 0.0018 -0.0011 0.0031 4 0.092 0.031 -0.0002 0.0012 0.0006 0.0018 0.0001 0.0009 0.0001 0.0023 0.0010 0.0018 -0.0007 0.0036 10 0.129 0.043 -0.0005 0.0019 -0.0022 0.0041 0.0009 0.0019 0.0052 0.0048 -0.0002 0.0037 0.0051 0.0069 11 0.117 0.040 0.0012 0.0015 -0.0008 0.0021 0.0007 0.0012 0.0003 0.0039 0.0002 0.0023 -0.0018 0.0039 27 0.114 0.029 0.0010 0.0013 0.0008 0.0017 0.0002 0.0012 -0.0001 0.0023 0.0013 0.0022 -0.0019 0.0032 15C 0.130 0.038 -0.0005 0.0018 -0.0016 0.0031 0.0002 0.0015 0.0025 0.0039 -0.0022 0.0032 -0.0023 0.0056 LOCATION Ru-103 Ru-106 Cs-134 Cs-137 Ba-140 Ce-141 Ce-144

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

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

1 -0.0018 0.0029 0.0047 0.0099 0.0000 0.0010 0.0010 0.0009 -0.0723 0.1425 0.0028 0.0043 -0.0038 0.0048 2 -0.0001 0.0031 -0.0035 0.0102 0.0009 0.0012 0.0004 0.0011 -0.0711 0.1758 0.0003 0.0051 0.0002 0.0055 3 -0.0021 0.0033 -0.0038 0.0109 0.0012 0.0012 0.0004 0.0010 0.0739 0.1969 -0.0015 0.0060 0.0041 0.0065 4 -0.0004 0.0028 -0.0009 0.0099 0.0004 0.0010 0.0004 0.0008 0.0421 0.1458 0.0038 0.0041 -0.0006 0.0044 10 -0.0012 0.0057 -0.0124 0.0184 0.0005 0.0019 -0.0002 0.0018 0.0009 0.2832 0.0047 0.0070 -0.0055 0.0071 11 0.0001 0.0038 0.0187 0.0122 0.0013 0.0013 -0.0006 0.0010 -0.0043 0.2211 -0.0064 0.0056 -0.0045 0.0058 27 0.0005 0.0030 -0.0059 0.0092 -0.0002 0.0010 0.0006 0.0009 0.0395 0.1676 -0.0006 0.0046 -0.0013 0.0049 15C 0.0025 0.0048 0.0107 0.0164 0.0010 0.0016 -0.0006 0.0014 0.0841 0.2636 -0.0007 0.0082 -0.0101 0.0087 3-13

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 4 AIR PARTICULATES (pCi/m3)

GAMMA SPECTRA - QTR 3 (07/03/12 - 10/02/12)

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

(+/-) (+1-) -0.0011--- 0.0

-- (+--)

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

1 0.146 0.051 0.0003 0.0018 0.0001 0.0034 -0.0002 0.0017 -0.0014 0.0039 -0.0011 0.0039 -0.0013 0.0069 2 0.124 0.044 0.0005 0.0021 0.0010 0.0043 0.0006 0.0019 0.0007 0.0048 -0.0018 0.0042 0.0016 0.0067 3 0.104 0.050 -0.0001 0.0014 -0.0005 0.0022 0.0008 0.0013 0.0029 0.0043 -0.0004 0.0030 0.0023 0.0052 4 0.118 0.040 -0.0003 0.0015 -0.0031 0.0028 0.0003 0.0014 0.0030 0.0040 0.0018 0.0034 0.0024 0.0047 10 0.115 0.061 0.0007 0.0018 0.0016 0.0040 0.0001 0.0014 -0.0018 0.0039 0.0034 0.0035 -0.0001 0.0064 11 0.145 0.034 0.0003 0.0010 0.0000 0.0022 -0.0008 0.0010 -0.0002 0.0025 -0.0006 0.0018 0.0003 0.0035 27 0.128 0.038 0.0002 0.0011 -0.0011 0.0033 -0.0009 0.0015 -0.0009 0.0034 0.0000 0.0027 0.0035 0.0043 15C 0.137 0.034 0.0000 0.0010 0.0000 0.0020 0.0004 0.0010 0.0010 0.0027 0.0008 0.0023 0.0028 0.0040 LOCATION Ru-103 Ru-106 Cs-134 Cs-137 Ba-140 Ce-141 Ce-144

(+--) . (+1-) (+7-) (+--) (+--)

(+/-)

1 -0.0038 0.0055 0.0057 0.0140 0.0017 0.0016 0.0005 0.0016 0.4542 0.6616 -0.0003 0.0086 -0.0018 0.0073 2 -0.0033 0.0064 -0.0096 0.0178 0.0005 0.0020 -0.0006 0.0017 -0.0635 0.5595 0.0034 0.0096 -0.0042 0.0071 3 0.0051 0.0057 -0.0063 0.0118 0.0027 0.0016 0.0003 0.0011 -0.8413 0.5738 -0.0091 0.0082 0.0039 0.0066 4 0.0042 0.0048 0.0032 0.0119 0.0004 0.0018 0.0002 0.0011 0.1072 0.4317 0.0046 0.0089 0.0007 0.0064 10 -0.0014 0.0068 0.0034 0.0150 0.0017 0.0018 0.0014 0.0013 -0.0653 0. 5860 0.0013 0.0110 -0.0064 0.0084 11 -0.0030 0.0034 -0.0016 0.0084 -0.0004 0.0009 0.0000 0.0008 -0.0964 0.3197 0.0044 0.0063 -0.0001 0.0041 27 0.0004 0.0045 -0.0007 0.0108 0.0002 0.0018 0.0012 0.0011 -0.0780 0.4100 -0.0060 0.0080 0.0012 0.0063 15C -0.0006 0.0038 -0.0030 0.0089 0.0013 0.0011 0.0006 0.0011 0.1086 0.3374 0.0025 0.0073 0.0019 0.0057 GAMMA SPECTRA - QTR 4 (10/02/12 - 01/13/13)

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

(+/-) 0.0006---- -- ) 0.0033---0-.00 (+--) (+/-)

(+/-)

1 0.112 0.039 -0.0025 0.0018 -0.0039 0.0026 0.0006 0.0015 0.0033 0.0041 0.0002 0.0028 -0.0015 0.0047 2 0.074 0.029 0.0006 0.0020 0.0006 0.0028 -0.0004 0.0019 0.0007 0.0041 -0.0002 0.0033 0.0031 0.0057 3 0.091 0.040 -0.0002 0.0013 -0.0008 0.0023 -0.0005 0.0012 0.0059 0.0038 0.0003 0.0025 0.0016 0.0041 4 0.110 0.037 0.0007 0.0016 -0.0004 0.0031 -0.0006 0.0016 0.0029 0.0043 0.0026 0.0033 -0.0014 0.0056 10 0.085 0.027 0.0005 0.0011 0.0003 0.0016 0.0000 0.0008 0.0017 0.0025 0.0022 0.0018 0.0005 0.0033 11 0.079 0.028 -0.0005 0.0012 -0.0013 0.0022 0.0003 0.0012 0.0017 0.0026 0.0013 0.0022 -0.0027 0.0031 27 0.097 0.035 0.0002 0.0016 0.0000 0.0025 0.0001 0.0016 0.0011 0.0037 0.0021 0.0028 -0.0016 0.0052 15C 0.100 0.031 0.0005 0.0013 0.0008 0.0020 0.0001 0.0011 -0.0009 0.0028 -0.0007 0.0021 -0.0017 0.0040 LOCATION Ru-103 Ru-106 Cs-134 Cs-- 37 Ba-140 Ce-141 Ce-144

(+1-) (+7-) (+--) (+--)

1 -0.0018 0.0044 < -0.0111 0.0139 0.0009 0.0023 0.0013 0.0015 0.1077 0.2271 0.0033 0.0075 -0.0014 0.0077 2 0.0029 0.0050 < -0.0017 0.0141 0.0015 0.0018 0.0007 0.0016 0.0698 0.2770 -0.0008 0.0058 0.0029 0.0061 3 0.0024 0.0037 < 0.0038 0.0118 0.0012 0.0017 -0.0005 0.0012 0.0332 0.1926 -0.0010 0.0051 0.0020 0.0059 4 0.0002 0.0047 < 0.0056 0.0171 0.0013 0.0017 0.0001 0.0014 0.0614 0.2099 -0.0016 0.0070 -0.0026 0.0077 10 0.0014 0.0030 < 0.0029 0.0096 0.0007 0.0013 0.0000 0.0009 0.0979 0.1404 -0.0014 0.0044 0.0036 0.0048 11 0.0014 0.0031 < -0.0048 0.0100 0.0010 0.0011 0.0006 0.0012 -0.0940 0.1706 0.0031 0.0053 0.0044 0.0058 27 -0.0008 0.0039 < -0.0087 0.0122 0.0025 0.0020 0.0000 0.0013 0.1775 0.2236 0.0040 0.0070 -0.0049 0.0075 15C -0.0009 0.0032 < -0.0017 0.0110 0.0013 0.0011 0.0002 0.0010 0.0199 0.1701 0.0001 0.0059 -0.0023 0.0065 3-14

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 5 AIR PARTICULATES Strontium Analyses for strontium in air particulate filters were not analyzed in 2012.

See discussion in Section 4.5.

3-15

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 6 SOIL (pCi/g dry wt.)

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

(+/-)

03 11/15/2012 0.060 0.260 18.4 1.2 0.152 0.278 0.013 0.031 0.002 0.032 -0.050 0.067 04 11/15/2012 -0.061 0.305 14.7 1.2 -0.076 0.343 0.002 0.034 0.013 0.035 -0.047 0.068 14C 11/15/2012 0.540 0.311 13.4 1.1 -0.073 0.311 0.027 0.032 0.021 0.031 -0.044 0.067 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-)

03 11/15/2012 0.015 0.037 0.047 0.085 0.041 0.034 0.007 0.053 -0.008 0.030 -0.241 0.263 04 11/15/2012 0.013 0.034 -0.051 0.090 0.029 0.038 0.046 0.063 0.000 0.036 -0.017 0.292 14C 11/15/2012 0.004 0.039 -0.001 0.088 0.055 0.039 -0.002 0.057 -0.034 0.036 0.074 0.299 COLLECTION LOCATION DATE Sb-125 Cs-134 Cs-1 37 Ce-141 Ce-144 Ac-228

(+/-)

03 11/15/2012 0.005 0.077 -0.046 0.035 0.226 0.059 -0.005 0.043 0.066 0.153 0.170 0.277 04 11/15/2012 0.018 0.091 0.011 0.037 0.636 0.072 0.024 0.058 -0.050 0.218 1.151 0.254 14C 11/15/2012 0.039 0.089 -0.023 0.037 1.466 0.092 0.066 0.052 0.070 0.214 0.085 0.272 3-16

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 7 COW MILK (pCi/I)

COLLECTION LOCATION DATE Sr-89 Sr-90 K-40 1-131 Cs-134 Cs-137 Ba-140 La-140

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

18 01/23/2012 1183 115 0.080 0.317 1.0 3.7 0.8 3.4 -11.0 15.0 -1.4 4.2 02/22/2012 1129 94.7 -0.032 0.180 0.7 2.4 0.3 2.4 -3.6 8.9 0.0 2.9 03/14/2012 1210 117 0.173 0.146 1.8 2.5 2.5 2.9 4.0 12.6 -0.4 3.3 03/29/2012 -1.1 4.7 0.2 0.4 1300 109 0.159 0.176 -1.7 3.3 5.0 3.6 -0.6 12.7 -0.8 3.8 04/11/2012 1319 156 -0.092 0.152 -0.5 4.0 2.4 4.5 3.1 19.2 -0.2 4.6 04/25/2012 1299 109 0.176 0.208 0.9 2.6 2.1 2.7 -16.5 12.5 1.3 3.1 05/09/2012 1301 146 0.167 0.328 0.6 4.6 1.0 4.0 -3.1 26.2 -1.8 6.7 05/23/2012 1194 110 0.204 0.262 1.2 2.2 1.3 2.1 -4.5 12.3 -1.2 3.0 06/06/2012 1217 117 -0.587 0.351 -0.7 2.5 0.1 2.8 2.3 12.1 0.0 2.6 06/19/2012 2.3 2.8 0.8 0.7 1247 141 -0.390 0.428 -11.7 4.3 2.3 4.2 -10.7 18.5 -1.0 7.0 07/10/2012 1.9 2.1 0.1 0.6 1285 121 -0.160 0.335 -2.6 3.1 -0.5 3.4 -7.3 15.7 2.1 4.8 22 08/22/2012 1295 143 -0.034 0.504 -4.6 4.0 -1.3 3.8 6.8 16.8 1.0 5.6 09/05/2012 1161 153 0.028 0.349 -1.5 5.1 3.9 5.5 -12.8 22.2 1.7 4.9 09/25/2012 0.83 1 -0.1 0.7 1424 116 -0.091 0.371 -2.3 3.5 2.7 3.1 -4.8 21.9 1.7 6.0 10/09/2012 1227 166 -0.077 0.335 -5.1 4.4 2.8 4.2 11.2 27.1 -1.4 6.8 10/23/2012 1368 154 -0.603 0.341 3.5 4.1 0.1 4.5 9.6 20.4 -4.1 5.9 11/14/2012 1356 125 -0.543 0.350 -2.0 3.4 1.0 3.0 -6.1 23.1 1.0 6.2 12/13/2012 2.25 1.97 0.31 0.47 1326 121 -0.404 0.287 -1.7 3.4 -2.3 3.6 -1.7 15.7 -4.3 4.5 3-17

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 8 GOAT MILK (pCi/I)

Goat Milk samples were not available during 2012. See discussion in Section 4.8 3-18

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 9 PASTURE GRASS / HAY/FEED (pCi/g wet wt.)

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

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

01/24/2012 0.121 0.095 17.75 0.47 -0.048 0.100 0.000 0.010 -0.016 0.010 -0.011 0.023 -0.003 0.013 02/22/2012 0.019 0.107 11.76 0.76 0.000 0.105 -0.008 0.014 0.003 0.015 0.003 0.036 -0.001 0.022 03/14/2012 0.048 0.077 10.27 0.50 0.069 0.085 -0.002 0.010 0.003 0.010 -0.004 0.025 0.007 0.013 03128/2012 -0.051 0.090 10.67 0.61 0.024 0.106 0.003 0.011 0.010 0.012 0.005 0.033 0.013 0.016 04/11/2012 0.129 0.158 11.42 0.93 -0.008 0.165 -0.002 0.020 0.002 0.017 -0.020 0.046 0.015 0.028 04/26/2012 0.956 0.208 6.02 0.51 -0.025 0.110 -0.006 0.013 -0.006 0.013 -0.001 0.028 0.002 0.014 05/10/2012 0.715 0.173 5.35 0.51 0.015 0.112 -0.001 0.014 -0.008 0.014 0.000 0.030 0.020 0.018 05/23/2012 0.918 0.190 3.44 0.36 -0.025 0.101 0.001 0.010 -0.012 0.010 -0.003 0.023 -0.001 0.011 06/0612012 0.448 0.147 4.45 0.35 -0.057 0.080 0.002 0.008 0.006 0.008 -0.003 0.020 -0.005 0.010 06/20/2012 0.494 0.228 5.96 0.63 0.003 0.156 -0.009 0.017 0.001 0.016 -0.033 0.035 0.013 0.019 07/11/2012 1.065 0.088 7.58 0.20 -0.002 0.052 0.003 0.004 -0.003 0.005 -0.001 0.012 0.006 0.006 07124/2012 0.892 0.071 5.34 0.16 0.001 0.042 -0.001 0.004 0.001 0.004 -0.004 0.010 0.000 0.005 08/08/2012 0.460 0.139 4.29 0.33 -0.020 0.085 -0.005 0.008 0.003 0.008 0.014 0.018 -0.005 0.009 08/22/2012 1.033 0.172 5.72 0.40 -0.024 0.081 0.006 0.009 -0.001 0.009 0.011 0.020 0.004 0.011 09/06/2012 0.924 0.193 4.17 0.41 0.019 0.098 -0.008 0.010 -0.004 0.010 0.000 0.024 0.000 0.013 09/26/2012 1.354 0.076 5.33 0.15 0.010 0.050 -0.003 0.004 0.001 0.004 -0.006 0.010 -0.002 0.004 10/09/2012 1.446 0.236 5.04 0.52 0.060 0.123 -0.011 0.013 0.000 0.013 0.003 0.026 -0.002 0.014 10/23/2012 2.612 0.288 6.42 0.53 -0.053 0.107 -0.006 0.011 0.003 0.012 0.036 0.029 -0.008 0.016 11/14/2012 0.111 0.128 13.18 0.59 -0.089 0.142 0.001 0.013 0.001 0.015 -0.010 0.033 0.008 0.016 12/13/2012 -0.012 0.133 13.15 1.22 0.049 0.127 0.000 0.015 0.001 0.016 -0.022 0.034 -0.022 0.020 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131

(+1-) (*/-)

01/24/2012 -0.061 0.025 0.011 0.010 0.014 0.018 -0.002 0.011 -0.017 0.091 -0.013 0.028 0.004 0.021 02/22/2012 -0.008 0.040 -0.003 0.014 -0.008 0.026 -0.002 0.013 -0.035 0.121 -0.017 0.037 -0.007 0.019 03/14/2012 0.021 0.026 0.005 0.010 -0.004 0.017 -0.003 0.009 -0.076 0.082 0.013 0.024 -0.003 0.016 03/28/2012 -0.037 0.033 0.000 0.012 -0.006 0.020 0.000 0.011 -0.002 0.099 -0.003 0.027 -0.007 0.020 04/11/2012 -0.040 0.051 -0.013 0.022 -0.024 0.036 -0.006 0.019 0.080 0.181 0.008 0.052 -0.009 0.030 04/26/2012 0.004 0.032 0.001 0.012 -0.001 0.023 0.002 0.013 0.003 0.115 0.001 0.034 0.009 0.018 05/10/2012 -0.021 0.032 0.009 0.014 -0.002 0.024 0.009 0.014 -0.053 0.119 0.020 0.030 0.009 0.028 05/23/2012 0.000 0.022 0.008 0.010 0.013 0.018 -0.005 0.011 -0.071 0.093 0.004 0.030 0.002 0.021 06/06/2012 -0.010 0.021 0.004 0.008 0.007 0.014 0.000 0.009 -0.017 0.074 -0.019 0.024 0.013 0.015 06120/2012 -0.068 0.042 -0.003 0.017 0.015 0.030 0.003 0.017 -0.040 0.139 0.053 0.044 -0.006 0.029 07/11/2012 -0.025 0.011 0.005 0.005 0.006 0.009 0.001 0.005 -0.037 0.041 -0.001 0.012 0.003 0.015 07/24/2012 -0.010 0.009 -0.004 0.004 -0.002 0.007 -0.003 0.005 -0.018 0.035 0.002 0.010 -0.003 0.012 08/08/2012 0.006 0.021 0.005 0.009 -0.002 0.014 -0.002 0.008 -0.004 0.065 -0.004 0.022 -0.003 0.023 08/22/2012 -0.019 0.022 0.009 0.009 0.003 0.015 0.000 0.010 0.000 0.079 -0.017 0.024 0.001 0.016 09/06/2012 -0.058 0.030 0.002 0.011 -0.008 0.017 -0.001 0.010 0.030 0.091 0.015 0.030 -0.009 0.018 09/26/2012 -0.003 0.010 0.005 0.005 -0.004 0.007 -0.001 0.005 0.023 0.033 0.001 0.010 0.001 0.024 10/09/2012 -0.021 0.035 0.005 0.013 0.005 0.022 -0.003 0.014 -0.032 0.115 0.024 0.035 0.014 0.023 10/23/2012 -0.021 0.031 -0.004 0.012 0.018 0.021 -0.002 0.012 0.028 0.098 -0.006 0.033 0.000 0.019 11114/2012 0.014 0.036 -0.006 0.017 0.006 0.025 0.019 0.016 0.025 0.125 0.022 0.037 0.020 0.047 12113/2012 0.038 0.042 -0.005 0.016 -0.009 0.022 -0.007 0.017 0.027 0.120 0.036 0.038 -0.003 0.028 Hay or feed 3-19

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 9 PASTURE GRASS / HAY/FEED (pCi/g wet wt.)

Location 21 COLLECTION DATE Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-)

01/24/2012 * -0.047 0.011 -0.009 0.010 0.008 0.055 0.002 0.012 -0.016 0.020 -0.095 0.070 0.045 0.044 02/22/2012 * -0.025 0.015 0.009 0.016 0.039 0.059 -0.008 0.019 -0.006 0.020 -0.044 0.077 0.041 0.053 03/14/2012 -0.009 0.011 -0.001 0.010 0.028 0.043 -0.001 0.012 -0.005 0.015 0.049 0.057 0.012 0.065 03/28/2012 -0.010 0.013 0.012 0.012 0.007 0.051 0.017 0.016 -0.004 0.017 0.091 0.066 0.009 0.045 04/11/2012 0.007 0.020 0.009 0.020 0.023 0.080 -0.016 0.024 0.021 0.031 0.160 0.117 0.045 0.084 04/26/2012 0.007 0.013 -0.014 0.013 0.029 0.057 -0.006 0.015 0.015 0.021 -0.068 0.081 0.014 0.052 05/10/2012 0.002 0.013 0.000 0.013 0.071 0.069 -0.009 0.024 0.001 0.018 -0.049 0.061 -0.010 0.048 05/23/2012 -0.003 0.011 0.007 0.010 -0.011 0.053 -0.009 0.015 0.005 0.020 0.001 0.076 -0.013 0.044 06/06/2012 -0.019 0.010 0.001 0.008 0.028 0.040 0.003 0.012 -0.008 0.014 0.003 0.059 0.025 0.036 06/20/2012 -0.016 0.020 -0.003 0.018 -0.043 0.072 -0.006 0.022 -0.046 0.031 0.012 0.119 0.035 0.062 07/11/2012 -0.007 0.005 0.001 0.005 -0.002 0.032 -0.008 0.007 0.003 0.012 -0.027 0.039 0.014 0.049 07/24/2012 0.000 0.004 0.000 0.004 0.034 0.028 -0.002 0.007 -0.007 0.008 -0.001 0.025 0.018 0.019 08/08/2012 -0.009 0.009 0.002 0.008 -0.005 0.049 0.008 0.013 -0.006 0.015 0.024 0.052 -0.004 0.031 08/22/2012 -0.003 0.009 0.019 0.010 -0.003 0.044 0.000 0.011 0.013 0.014 -0.029 0.055 0.013 0.038 09/06/2012 0.002 0.012 0.011 0.010 -0.016 0.049 -0.007 0.014 0.001 0.017 -0.014 0.071 0.030 0.040 09/26/2012 -0.004 0.004 0.017 0.005 -0.018 0.038 0.011 0.010 -0.012 0.010 0.003 0.024 0.026 0.046 10/09/2012 -0.011 0.014 -0.017 0.014 -0.041 0.068 -0.004 0.019 -0.014 0.022 0.008 0.088 0.016 0.047 101/231/2012 -0.017 0.011 -0.003 0.013 0.025 0.057 0.007 0.017 0.012 0.018 -0.004 0.074 0.018 0.052 11/14/2012

0.008 0.015 -0.012 0.014 0.016 0.104 -0.037 0.029 -0.015 0.025 0.083 0.067 0.010 0.068 12/13/2012

0.003 0.015 0.002 0.016 0.071 0.069 -0.006 0.024 0.007 0.024 0.018 0.088 0.019 0.068

Hay or feed 3-20

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 9 PASTURE GRASS / HAY/FEED (pCi/g wet wt.)

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

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

01/23/2012 0.366 0.189 8.78 0.57 0.005 0.130 0.003 0.015 -0.001 0.015 -0.012 0.034 -0.009 0.017 02/22/2012 0.665 0.401 17.06 1.14 0.241 0.226 -0.004 0.025 0.002 0.026 0.020 0.057 -0.007 0.034 03/14/2012 0.240 0.184 17.65 0.86 0.068 0.195 -0.012 0.021 0.009 0.022 -0.009 0.048 -0.019 0.027 03/2812012 0.010 0.119 8.51 0.66 -0.067 0.128 0.000 0.015 -0.004 0.017 0.019 0.037 -0.006 0.021 04/11/2012 1.471 0.226 6.18 0.54 -0.008 0.110 -0.014 0.014 -0.004 0.014 0.000 0.026 -0.005 0.017 04/25/2012 1.212 0.292 6.57 0.71 -0.058 0.160 0.002 0.020 -0.005 0.020 -0.013 0.045 -0.014 0.027 05/10/2012 1.155 0.257 5.06 0.47 0.012 0.118 0.004 0.013 0.000 0.011 -0.022 0.030 -0.010 0.014 05/23/2012 0.452 0.125 4.68 0.35 -0.022 0.065 0.004 0.007 0.004 0.006 -0.007 0.016 0.010 0.010 06/06/2012 0.706 0.256 4.69 0.66 0.111 0.189 -0.016 0.021 -0.014 0.024 0.018 0.045 -0.004 0.027 06/19/2012 0.717 0.340 4.57 0.86 0.123 0.217 0.007 0.025 0.000 0.026 0.059 0.066 0.022 0.029 07/10/2012 0.470 0.069 6.49 0.20 0.012 0.046 0.001 0.004 0.002 0.005 0.000 0.012 -0.002 0.006 07/2312012 0.844 0.066 5.93 0.18 -0.003 0.044 0.002 0.004 -0.003 0.005 -0.001 0.011 0.006 0.005 08/08/2012 0.715 0.208 5.66 0.52 0.023 0.130 -0.003 0.014 0.008 0.014 0.024 0.032 0.000 0.017 08/22/2012 2.303 0.169 6.36 0.32 -0.009 0.071 -0.002 0.008 -0.004 0.008 -0.006 0.018 0.009 0.010 09/06/2012 2.398 0.141 5.83 0.27 0.014 0.046 0.003 0.005 0.000 0.005 0.009 0.011 -0.005 0.006 09/26/2012 1.123 0.076 5.54 0.14 -0.037 0.043 0.000 0.003 -0.005 0.004 -0.001 0.010 0.000 0.004 10/09/2012 1.979 0.231 5.52 0.50 0.078 0.100 -0.006 0.009 0.001 0.009 -0.004 0.028 0.007 0.014 10/23/2012 2.735 0.295 8.72 0.65 -0.016 0.122 -0.001 0.013 0.001 0.013 -0.025 0.030 -0.012 0.019 11/14/2012 2.417 0.252 7.72 0.48 -0.031 0.121 0.001 0.012 0.007 0.012 -0.002 0.031 0.014 0.014 12/13/2012 0.775 0.226 11.10 0.72 -0.112 0.170 -0.018 0.020 -0.005 0.021 0.057 0.045 -0.010 0.023 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131

(+1-) (+1-)

01/23/2012 -0.005 0.041 0.002 0.016 -0.004 0.026 0.003 0.016 0.034 0.137 0.001 0.038 0.003 0.029 02/22/2012 -0.053 0.062 0.003 0.024 0.022 0.046 -0.004 0.027 0.146 0.236 -0.031 0.070 -0.005 0.037 03/14/2012 -0.012 0.058 0.028 0.022 0.008 0.037 -0.019 0.022 -0.097 0.194 -0.003 0.059 -0.008 0.037 03/28/2012 -0.070 0.043 0.005 0.017 0.005 0.026 -0.005 0.015 -0.004 0.129 -0.006 0.039 0.009 0.025 04/11/2012 -0.038 0.033 -0.006 0.013 0.009 0.023 0.011 0.014 0.008 0.110 0.009 0.034 0.003 0.021 04/25/2012 -0.065 0.056 -0.002 0.021 0.001 0.038 -0.008 0.019 0.050 0.184 0.002 0.052 -0.011 0.031 05/10/2012 0.004 0.032 -0.003 0.012 -0.011 0.021 0.007 0.014 -0.037 0.096 -0.014 0.031 -0.003 0.028 05/23/2012 -0.002 0.019 0.002 0.007 -0.002 0.013 -0.002 0.008 0.021 0.056 0.001 0.018 0.006 0.014 06/06/2012 -0.039 0.055 0.004 0.021 0.003 0.038 -0.010 0.021 0.014 0.189 0.009 0.053 0.018 0.033 06/19/2012 -0.027 0.064 0.015 0.028 0.009 0.048 0.017 0.030 0.162 0.231 0.009 0.066 -0.017 0.048 07/10/2012 0.003 0.013 0.005 0.005 -0.008 0.009 -0.003 0.005 -0.010 0.038 -0.005 0.011 -0.004 0.015 07/23/2012 -0.028 0.011 0.000 0.004 -0.003 0.008 -0.003 0.005 -0.036 0.036 -0.008 0.011 0.004 0.014 08/08/2012 -0.018 0.038 -0.001 0.015 -0.007 0.028 -0.013 0.015 0.060 0.119 -0.033 0.032 0.019 0.037 08/22/2012 -0.032 0.020 0.002 0.009 0.001 0.015 0.005 0.008 -0.039 0.068 -0.012 0.022 -0.008 0.014 09/06/2012 -0.003 0.012 0.002 0.005 0.000 0.008 -0.004 0.005 -0.041 0.046 -0.003 0.014 0.002 0.008 09/26/2012 -0.001 0.009 -0.001 0.004 0.000 0.007 0.000 0.004 0.038 0.030 -0.003 0.009 -0.021 0.021 10/09/2012 -0.021 0.030 0.003 0.010 0.004 0.018 -0.009 0.010 0.077 0.082 -0.015 0.028 -0.008 0.021 10/23/2012 -0.017 0.035 0.009 0.013 0.020 0.022 0.008 0.014 -0.007 0.113 -0.002 0.037 -0.014 0.024 11/14/2012 0.041 0.029 -0.005 0.014 0.009 0.022 -0.004 0.013 -0.083 0.102 -0.027 0.029 -0.017 0.037 12/13/2012 -0.058 0.048 -0.001 0.020 -0.015 0.036 -0.005 0.021 0.115 0.182 0.037 0.052 -0.018 0.037 Hay or feed 3-21

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 9 PASTURE GRASS / HAY/FEED (pCi/g wet wt.)

Location 24 COLLECTION DATE Cs-134 Cs- 137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

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

01/23/2012

0.005 0.017 0.081 0.023 0.003 0.079 0.039 0.025 -0.011 0.023 0.012 0.071 0.003 0.081 02/22/2012

0.014 0.026 0.098 0.031 0.068 0.104 0.011 0.024 -0.012 0.041 -0.020 0.179 0.019 0.109 03/14/2012

0.003 0.023 0.010 0.023 0.008 0.098 -0.020 0.026 -0.016 0.036 -0.104 0.133 0.018 0.148 03/28/2012 -0.008 0.016 -0.011 0.017 0.021 0.071 -0.018 0.020 -0.004 0.020 -0.008 0.078 0.000 0.062 04/11/2012 -0.011 0.015 -0.005 0.014 -0.011 0.059 -0.002 0.014 -0.006 0.020 0.000 0.080 0.055 0.055 04/25/2012 -0.009 0.023 0.007 0.023 0.049 0.092 0.011 0.025 0.001 0.024 0.021 0.089 -0.007 0.079 05/10/2012 0.006 0.013 0.001 0.012 -0.009 0.074 -0.019 0.019 0.014 0.021 -0.042 0.081 0.058 0.048 05/23/2012 -0.001 0.007 0.000 0.008 0.012 0.039 0.004 0.008 -0.005 0.012 -0.028 0.048 0.006 0.030 06/06/2012 0.005 0.023 0.013 0.020 0.023 0.099 -0.007 0.027 -0.001 0.028 -0.056 0.099 0.050 0.089 06/19/2012 -0.001 0.028 -0.002 0.025 -0.027 0.130 0.009 0.033 -0.014 0.032 0.004 0.119 0.050 0.104 07/10/2012 -0.003 0.005 0.004 0.005 0.005 0.031 0.005 0.009 -0.002 0.008 -0.010 0.025 0.042 0.030 07/23/2012 -0.003 0.005 -0.002 0.004 -0.008 0.031 -0.002 0.008 -0.004 0.009 0.019 0.028 0.030 0.033 08/08/2012 -0.001 0.014 0.007 0.015 -0.037 0.087 -0.014 0.029 -0.014 0.021 0.005 0.065 0.054 0.055 08/22/2012 0.005 0.008 0.002 0.008 0.014 0.038 0.001 0.010 0.006 0.013 0.006 0.049 0.042 0.041 09/06/2012 -0.001 0.005 0.003 0.005 0.008 0.021 -0.003 0.006 -0.013 0.010 -0.015 0.036 0.021 0.042 09/26/2012 -0.004 0.004 0.003 0.003 0.009 0.036 0.000 0.010 0.011 0.008 -0.002 0.023 0.004 0.015 10/09/2012 0.003 0.011 -0.002 0.011 0.004 0.054 -0.014 0.013 -0.004 0.016 -0.063 0.060 0.004 0.043 10/23/2012 -0.023 0.013 0.004 0.014 -0.021 0.059 -0.009 0.016 -0.009 0.023 0.018 0.093 0.033 0.057 11/14/2012 0.006 0.012 -0.001 0.012 -0.027 0.084 -0.007 0.022 -0.006 0.018 -0.002 0.064 0.088 0.086 12/13/2012 * -0.046 0.021 0.035 0.021 0.098 0.097 -0.007 0.029 0.001 0.030 -0.096 0.112 0.029 0.088

Hay or feed 3-22

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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

(+/-)

71 03/07/2012 -196 437 -8.9 21.4 11.9 33.2 4.2 26.2 -1.3 2.3 -0.7 2.3 -0.2 5.2 1.4 2.4 06/25/2012 202 462 1.9 20.6 38.5 38.4 2.9 23.5 0.5 2.0 -1.4 2.1 2.8 4.6 0.3 2.3 09/28/2012 573 535 -1.2 11.0 -22.8 18.6 9.5 13.4 -1.1 1.1 1.5 1.2 1.8 2.8 1.1 1.1 12/19/2012 624 509 2.0 18.4 12.2 32.1 18.2 26.2 -0.4 1.5 -0.7 1.7 2.0 3.7 0.9 1.6 72 03/08/2012 -410 431 -27.4 31.1 -26.4 45.0 -4.4 30.2 2.3 3.7 0.5 3.2 9.5 6.8 0.0 2.4 06/25/2012 124 461 6.2 18.4 36.9 37.5 -8.6 24.2 1.0 1.8 -0.1 1.9 1.8 4.1 0.4 1.8 09/28/2012 -57.3 482 15.5 13.0 35.0 33.3 -6.1 15.6 0.6 1.2 1.0 1.4 0.3 3.2 0.6 1.3 12/19/2012 409 489 2.5 23.0 29.8 38.1 -1.9 29.7 0.4 2.4 -1.4 2.5 -0.7 5.2 1.1 2.5 76 03/06/2012 179 590 3.3 28.4 -11.3 50.2 -29.4 30.5 -1.1 2.9 -2.9 3.4 -0.4 5.9 0.0 3.0 09/30/2012 108 496 -1.1 13.0 37.1 33.3 -2.5 17.2 -0.2 1.3 -1.0 1.4 1.1 2.9 1.2 1.3 12/17/2012 493 474 -6.4 8.7 21.5 16.8 0.1 12.5 -0.3 0.8 0.2 1.0 1.7 2.0 0.3 0.8 06/21/2012 184 287 -18.2 24.3 27.3 49.3 12.1 25.5 1.0 3.0 3.0 2.8 6.5 6.0 0.3 2.8 77 03/06/2012 291 595 -1.7 34.4 -37.3 48.9 3.6 36.4 -2.6 3.6 0.0 3.6 1.7 6.9 1.5 4.1 09/30/2012 -108 477 -4.6 13.4 34.7 34.1 -6.0 15.8 -0.2 1.4 -0.4 1.4 2.9 3.4 0.1 1.3 12/17/2012 416 461 7.4 10.5 23.2 17.0 2.4 15.0 -0.6 1.0 -0.8 1.1 1.8 2.4 0.4 0.9 06/21/2012 125 290 -13.8 26.4 5.1 51.9 22.9 32.5 -2.2 3.0 -2.6 3.3 -1.1 6.3 1.4 3.1 78 03/06/2012 178 585 -1.4 29.6 38.1 55.6 2.4 35.2 -1.9 3.6 -0.9 3.2 2.3 7.4 -2.5 3.8 09/30/2012 -191 471 8.2 11.3 11.2 27.5 -4.3 13.9 -0.8 1.1 0.1 1.2 1.9 2.7 -0.1 1.1 12/17/2012 302 452 5.0 14.4 9.1 31.7 -4.0 18.2 -0.6 1.5 -0.6 1.7 3.8 3.8 0.3 1.5 06/20/2012 256 303 1.5 28.9 29.2 53.1 15.4 29.1 -0.9 3.6 -0.1 3.3 5.6 7.0 1.2 3.4 79 03/07/2012 -326 443 3.3 22.8 39.9 73.3 -15.5 30.8 -0.1 2.3 1.2 2.9 -4.3 6.1 0.5 2.2 06/25/2012 -25 448 9.2 24.9 37.3 54.7 2.3 29.9 1.1 2.7 0.9 3.1 1.6 6.4 -0.4 2.7 09/28/2012 204 505 8.6 10.2 43.0 23.2 -3.7 13.1 0.4 1.1 -0.6 1.1 1.5 2.4 0.7 1.0 12/19/2012 180 471 -6.0 32.0 9.3 59.9 -3.5 37.7 -0.6 3.0 -2.2 3.3 -2.2 7.2 1.8 3.1 80 03/07/2012 197 479 -7.9 27.3 29.9 42.5 -0.9 33.5 0.1 2.7 -1.5 2.9 0.1 5.8 -1.1 2.7 81 03/08/2012 -19.6 461 -39.5 40.1 1.0 80.4 43.7 38.5 3.4 4.6 -2.4 4.4 5.0 9.5 -4.1 4.5 06/25/2012 -113 438 -16.1 20.1 30.6 46.7 5.7 24.5 0.6 1.9 -0.4 2.2 -1.2 4.5 -0.5 1.9 09/28/2012 446 525 13.3 11.1 5.6 27.1 -4.8 14.2 -0.2 1.1 -0.5 1.2 1.8 2.7 0.8 1.1 12/19/2012 318 487 -5.7 19.5 23.8 41.8 13.2 24.1 -0.1 1.9 -1.6 2.1 -0.7 3.9 -0.1 2.0 82 03/07/2012 82 459 27.6 30.9 13.5 50.1 10.4 31.8 -1.5 3.5 -3.1 3.7 1.4 6.9 -0.5 3.2 06/25/2012 735 518 -3.3 27.3 83.8 73.3 27.0 31.1 -0.1 2.6 -0.7 2.4 -2.0 6.2 -1.7 2.4 0912612012 720 547 9.7 10.9 25.3 25.8 3.5 13.1 0.0 1.0 -0.4 1.1 1.4 2.9 0.4 1.1 3-23

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 10 WELL WATER (pCi/I)

COLLECTION LOCATION DATE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 Cs-134 71 03/07/2012 0.6 4.7 0.4 2.8 2.6 4.5 -0.2 3.2 -3.0 21.4 0.7 6.4 3.3 6.2 1.1 2.5 06/25/2012 2.4 4.1 -0.2 1.9 1.7 3.7 -0.9 2.5 -6.1 16.6 0.1 5.1 -2.8 7.8 0.0 2.1 09128/2012 -5.1 2.6 1.4 1.2 2.1 2.1 -0.7 1.5 4.4 9.6 -1.8 2.9 -0.3 5.7 -1.2 1.1 12/19/2012 -1.3 4.0 1.6 1.9 -1.6 3.1 -1.1 2.5 3.7 15.5 -3.0 5.6 -1.5 8.3 -0.4 1.7 72 03/08/2012 -6.9 6.8 -0.5 3.2 -1.3 4.6 -1.5 3.7 11.4 26.8 -1.0 7.6 -5.8 7.2 0.9 3.2 06/25/2012 -6.9 4.4 1.7 1.9 1.1 3.6 -1.7 2.4 0.3 18.0 1.4 5.2 4.5 8.3 -1.0 2.1 09/28/2012 -5.0 3.0 1.0 1.4 1.9 2.5 -2.8 1.7 -9.5 11.6 -0.3 3.4 -4.1 6.9 -0.8 1.4 12/19/2012 -8.1 5.3 0.8 2.6 1.9 4.4 -4.6 3.2 10.0 22.0 0.1 6.7 -3.4 9.1 -1.1 2.4 76 03/06/2012 -4.6 6.7 0.0 3.5 4.3 5.6 0.5 3.8 -8.6 26.4 -5.4 9.6 1.2 6.0 1.1 3.4 09/30/2012 -6.5 2.9 1.8 1.5 0.1 2.5 -2.1 1.7 8.1 12.0 -0.1 3.5 -3.4 6.0 -0.2 1.4 12/17/2012 1.5 1.9 0.6 1.0 -0.1 1.7 0.1 1.4 -3.9 7.2 0.5 2.3 3.4 6.8 0.3 0.9 06/21/2012 -1.3 7.3 3.1 3.0 -1.0 5.0 0.0 3.1 0.9 25.5 4.5 8.2 -2.4 3.8 -0.1 3.3 77 03/06/2012 3.3 10.0 2.9 4.2 -0.4 6.5 -2.7 4.1 -7.4 30.6 0.0 11.1 -0.9 7.2 1.3 4.1 09/30/2012 -1.9 3.2 0.8 1.5 1.7 2.7 -2.3 1.8 -1.0 11.4 -1.6 3.5 8.2 5.9 0.1 1.4 12/17/2012 -0.7 2.3 0.8 1.1 0.0 2.0 -1.6 1.4 6.0 8.5 -0.5 2.7 0.2 8.0 -0.4 1.1 06/2112012 -1.7 8.2 7.9 4.0 0.9 5.1 -2.5 3.4 7.7 27.3 -2.9 9.9 1.5 4.9 1.0 4.8 78 03/06/2012 -5.3 7.8 2.8 3.3 -6.8 6.5 -0.2 3.6 -8.6 31.5 3.1 9.4 2.6 6.3 -0.1 3.8 09/30/2012 -4.3 2.5 0.0 1.3 -1.3 2.3 -1.3 1.5 -8.3 10.7 1.3 3.2 -1.5 5.2 -1.3 1.4 12/17/2012 -0.5 3.5 0.9 1.8 0.3 3.1 -1.4 2.0 4.2 12.5 2.5 3.5 -2.6 10.2 -0.4 1.5 06/20/2012 -1.7 7.0 1.6 3.3 3.5 5.5 -3.2 3.6 10.1 28.2 3.5 9.6 1.9 5.0 0.2 3.4 79 03/07/2012 -1.0 5.5 -1.6 3.1 -1.1 4.8 -0.6 3.1 8.8 22.4 -5.6 7.6 5.0 7.9 -0.8 2.6 06/25/2012 -2.4 5.8 -1.0 3.0 0.7 5.3 2.1 3.4 -0.5 24.4 -0.9 6.7 1.7 10.2 -0.8 2.8 0912812012 1.4 2.2 0.4 1.2 0.5 2.0 0.1 1.4 -3.9 9.2 -0.2 2.8 -0.6 5.5 0.7 1.2 12/19/2012 -14.2 7.9 3.0 3.5 5.9 6.6 1.9 4.1 -10.6 29.0 1.3 8.6 7.9 12.0 0.5 3.4 80 03/07/2012 -1.1 6.9 1.6 3.1 -0.4 5.2 -1.1 3.4 0.3 26.5 -3.5 8.4 -1.3 7.6 0.2 3.2 81 03/08/2012 -11.8 10.2 -2.2 5.0 -3.1 8.4 -1.9 4.9 22.2 36.9 -2.7 11.0 -0.2 9.3 1.3 4.4 06/25/2012 1.2 4.1 2.1 2.4 -0.1 4.1 -1.9 2.7 4.2 18.5 -3.2 5.3 -1.9 8.2 -1.4 2.5 09/28/2012 -2.9 2.5 1.4 1.2 -1.4 2.2 -0.5 1.5 -1.0 9.7 -0.3 2.9 -3.2 6.0 0.3 1.4 12/19/2012 1.1 4.8 3.6 2.2 0.7 3.6 0.3 2.5 5.1 17.3 -2.0 5.6 -1.7 7.7 2.0 3.4 82 03/07/2012 0.6 5.5 0.7 3.8 -7.0 6.2 -0.8 3.8 -9.6 28.5 -4.7 9.0 3.6 8.1 2.8 2.6 06/25/2012 -0.5 5.9 -2.5 2.9 -4.6 5.3 -0.9 3.6 -7.4 26.9 1.6 7.0 8.9 11.4 0.1 2.9 09/26/2012 -5.4 2.5 0.3 1.2 -0.3 2.0 -0.7 1.5 9.3 9.1 0.9 2.7 -2.1 6.6 0.0 1.1 3-24

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TabLE 10 WELL WATER (pCi/I)

COLLECTION LOCATION DATE Cs-137 Ba-140 La-140 Ac-228

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

71 03/07/2012 -0.9 2.5 3.6 14.8 2.5 4.8 3.5 8.8 06/25/2012 1.6 2.2 0.8 15.7 4.4 5.4 -1.2 7.6 09/28/2012 -0.1 1.1 -2.0 10.1 -0.7 3.7 7.8 6.9 12/19/2012 -0.8 1.7 -5.7 16.8 -1.8 3.9 0.4 6.3 72 03/08/2012 -2.2 3.3 -10.5 19.5 -16.1 7.5 -5.4 11.3 06/25/2012 1.8 1.8 -13.9 15.5 -1.6 4.6 -2.1 7.3 09/28/2012 2.0 1.3 7.6 13.0 4.2 4.3 -2.3 5.4 12/19/2012 -2.0 2.3 -9.1 19.9 -0.5 5.9 -5.5 9.5 76 03/06/2012 -1.2 3.1 1.4 15.0 -6.3 5.6 -4.6 12.2 09/30/2012 1.9 1.3 2.8 12.0 -3.7 3.7 -2.3 5.9 12/17/2012 -0.6 0.8 5.1 .9.9 -0.9 3.2 -0.2 4.0 06/21/2012 0.0 3.2 2.2 12.5 2.2 4.3 7.1 11.9 77 03/06/2012 -2.0 4.0 -13.4 19.0 3.2 6.0 -5.0 13.9 09/30/2012 -0.5 1.4 11.4 12.3 -2.1 3.8 -2.7 5.9 12/17/2012 0.1 1.0 2.2 11.9 -0.2 3.7 -0.1 4.3 06/21/2012 2.5 3.2 8.8 13.3 2.4 4.5 -1.0 11.9 78 03/06/2012 1.7 3.8 5.0 18.2 -2.0 5.1 -3.7 12.9 09/30/2012 -1.1 1.2 0.9 10.5 -0.5 3.2 2.8 9.2 12/17/2012 0.9 1.4 -5.2 16.5 0.6 6.0 -1.7 6.6 06/20/2012 0.5 3.2 -3.2 14.1 1.1 4.8 7.2 12.6 79 03/07/2012 0.8 2.7 -4.5 18.3 0.9 5.4 1.0 11.7 06/25/2012 -0.5 2.6 -18.7 21.0 -5.5 7.2 -0.9 10.5 09/28/2012 0.2 1.1 5.5 10.3 0.5 3.0 3.0 5.3 12/19/2012 -0.6 2.9 8.0 23.4 0.8 6.7 -2.3 12.5 80 03/07/2012 2.1 3.0 -4.6 18.7 -2.1 5.1 11.6 10.6 81 03/08/2012 -0.5 4.5 -7.5 25.4 0.6 6.7 14.3 15.0 06/25/2012 -1.4 2.2 1.6 17.1 0.8 5.1 -0.4 7.8 09/28/2012 1.4 1.1 2.6 10.9 0.5 3.5 2.3 4.8 12/19/2012 -0.9 2.0 -9.2 15.4 -1.7 4.4 3.6 8.3 82 03/07/2012 1.3 3.4 5.8 19.3 -1.3 7.8 7.9 12.6 06/25/2012 1.1 2.8 -15.1 24.1 -1.3 6.8 2.0 11.9 09/26/2012 0.6 1.0 11.6 11.2 2.1 4.2 -5.5 4.5 3-25

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 11 RESERVOIR WATER (pCi/1)

Reservoir water was not sampled in 2012. See discussion in Section 4.11.

3-26

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 06/27/2012 Lettuce 0.290 0.080 3.811 0.193 -0.008 0.066 -0.002 0.005 0.000 0.006 -0.005 0.014 -0.002 0.007 06/28/2012 Raspberries 0.060 0.029 1.460 0.093 -0.040 0.034 0.000 0.003 -0.002 0.003 -0.002 0.007 0.000 0.003 09/26/2012 Greens 0.190 0.126 5.117 0.421 0.065 0.116 -0.011 0.012 -0.012 0.012 0.000 0.029 -0.009 0.013 10/03/2012 apples -0.017 0.141 0.670 0.323 0.000 0.144 -0.017 0.019 0.007 0.019 0.001 0.037 0.004 0.017 COLLECTION DATE TYPE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 06/27/2012 Lettuce -0.035 0.014 0.005 0.008 -0.005 0.010 -0.002 0.007 -0.009 0.049 -0.014 0.015 -0.003 0.023 06/28/2012 Raspberries -0.011 0.006 0.004 0.003 0.004 0.005 0.003 0.004 0.006 0.026 0.003 0.008 -0.003 0.011 09/26/2012 Greens 0.018 0.029 0.013 0.012 0.017 0.021 -0.002 0.013 0.029 0.097 -0.012 0.031 -0.014 0.034 10/03/2012 apples 0.000 0.040 0.051 0.023 0.011 0.030 -0.007 0.017 0.134 0.150 -0.041 0.049 0.010 0.027 COLLECTION DATE TYPE Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228 06/27/2012 Lettuce -0.022 0.006 -0.001 0.006 -0.005 0.046 0.001 0.013 0.015 0.014 -0.012 0.039 0.009 0.023 06/28/2012 Raspberries -0.013 0.003 0.001 0.003 -0.011 0.022 -0.006 0.006 0.011 0.007 -0.026 0.023 0.008 0.015 09/26/2012 Greens 0.000 0.012 -0.013 0.011 -0.007 0.075 0.000 0.020 -0.009 0.022 0.031 0.078 0.041 0.056 10/03/2012 apples -0.010 0.021 0.001 0.020 -0.031 0.085 0.012 0.032 -0.005 0.022 -0.036 0.082 0.031 0.072 3-27

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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

(+/-) (+/-)

06/28/2012 Lettuce 0.201 0.065 4.861 0.197 -0.033 0.061 0.002 0.005 -0.007 0.005 -0.001 0.012 -0.003 0.006 06/28/2012 Raspberries 0.053 0.039 1.285 0.090 -0.001 0.026 0.000 0.002 0.001 0.002 0.000 0.006 -0.001 0.003 10/03/2012 greens 0.242 0.273 7.650 0.813 -0.008 0.180 -0.005 0.018 0.008 0.020 -0.017 0.044 0.013 0.025 10/03/2012 apples -0.047 0.069 0.975 0.222 -0.041 0.082 -0.001 0.008 0.005 0.009 -0.001 0.021 0.002 0.009 COLLECTION DATE TYPE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131

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

06/28/2012 Lettuce -0.001 0.013 0.001 0.005 0.002 0.009 0.002 0.006 0.011 0.046 0.010 0.014 -0.007 0.020 06/28/2012 Raspberries 0.000 0.006 0.002 0.002 0.003 0.004 -0.001 0.003 -0.007 0.021 0.000 0.006 0.002 0.009 10/03/2012 greens -0.002 0.054 0.019 0.025 0.014 0.037 -0.007 0.021 0.103 0.172 -0.024 0.051 -0.027 0.033 10/03/2012 apples 0.004 0.022 0.004 0.010 -0.001 0.017 -0.001 0.010 0.006 0.074 0.008 0.024 0.010 0.014 COLLECTION DATE TYPE Cs-1 34 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228 06/28/2012 Lettuce 0.000 0.005 0.002 0.005 0.019 0.040 -0.008 0.011 -0.002 0.012 0.014 0.036 0.003 0.033 06/28/2012 Raspberries -0.008 0.003 -0.001 0.002 0.003 0.018 0.006 0.006 0.006 0.004 0.000 0.015 0.001 0.010 10/03/2012 greens -0.015 0.025 0.013 0.023 -0.023 0.094 -0.003 0.029 0.014 0.030 0.030 0.121 0.081 0.085 10/03/2012 apples -0.001 0.009 0.003 0.010 0.022 0.041 -0.011 0.013 0.012 0.014 0.020 0.055 -0.008 0.033 3-28

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 13 BROADLEAF VEGETATION (pCi/g wet wt.)

LOCATION 1 COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60 05/15/2012 1.621 0.371 3.868 0.563 0.034 0.179 -0.008 0.015 0.008 0.017 0.023 0.042 0.002 0.018 06/19/2012 1.041 0.252 3.484 0.476 0.108 0.141 -0.005 0.012 -0.005 0.014 0.023 0.030 0.002 0.015 07/17/2012 1.013 0.222 3.553 0.441 0.019 0.109 0.005 0.010 0.002 0.010 -0.002 0.023 -0.002 0.013 08/14/2012 1.233 0.224 3.385 0.414 -0.069 0.132 0.005 0.012 0.000 0.013 0.001 0.027 0.001 0.017 09/11/2012 1.765 0.199 2.660 0.291 -0.050 0.102 0.005 0.009 0.000 0.009 0.005 0.020 0.002 0.010 10/16/2012 1.736 0.126 2.498 0.194 -0.018 0.062 0.003 0.006 -0.003 0.007 -0.002 0.013 0.003 0.007 COLLECTION DATE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 05/15/2012 -0.020 0.036 0.006 0.019 0.005 0.033 -0.003 0.018 -0.032 0.145 0.008 0.041 0.032 06/19/2012 -0.038 0.034 -0.003 0.015 0.006 0.025 0.002 0.015 -0.044 0.125 0.021 0.036 0.009 0.027 07/17/2012 -0.013 0.028 0.006 0.011 0.013 0.020 -0.007 0.011 0.015 0.092 0.003 0.029 0.005 0.024 08/14/2012 -0.042 0.030 0.010 0.013 -0.001 0.023 0.007 0.013 0.011 0.123 0.014 0.035 -0.002 0.023 09/11/2012 -0.015 0.020 0.004 0.010 -0.004 0.016 -0.001 0.010 -0.047 0.083 -0.014 0.028 0.002 0.021 10/16/2012 -0.063 0.015 0.011 0.006 0.002 0.011 -0.007 0.007 0.012 0.052 -0.005 0.016 0.007 0.013 COLLECTION DATE Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-)

05/15/2012 0.002 0.018 0.006 0.015 0.067 0.143 0.006 0.037 -0.008 0.029 0.056 0.101 0.094 0.075 06/19/2012 -0.002 0.016 0.009 0.015 -0.025 0.062 -0.001 0.018 -0.017 0.027 -0.036 0.106, 0.045 0.069 07/17/2012 0.003 0.011 0.004 0.012 0.006 0.058 -0.001 0.013 -0.003 0.021 0.027 0.079 0.006 0.080 08/14/2012 -0.005 0.016 -0.004 0.015 0.007 0.068 0.000 0.017 -0.003 0.022 0.015 0.107 0.107 0.052 09/11/2012 -0.005 0.011 0.032 0.014 0.007 0.046 -0.002 0.012 0.003 0.019 0.009 0.067 0.072 0.058 10/16/2012 -0.004 0.007 0.016 0.009 0.024 0.032 0.004 0.011 0.015 0.011 0.012 0.040 0.014 0.028 3-29

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 13 BROADLEAF VEGETATION (pCi/g wet wt.)

LOCATION 10 COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60 05/15/2012 1.023 0.251 4.184 0.463 0.031 0.129 0.003 0.012 -0.004 0.010 0.006 0.027 0.007 0.013 06/19/2012 0.656 0.199 4.143 0.461 -0.046 0.111 -0.005 0.012 -0.010 0.012 0.009 0.026 0.012 0.015 07/17/2012 0.479 0.167 3.755 0.436 -0.092 0.108 -0.002 0.013 -0.003 0.011 -0.007 0.024 0.005 0.012 08/14/2012 0.508 0.194 3.037 0.486 -0.025 0.129 0.001 0.016 0.010 0.016 -0.020 0.032 0.005 0.017 09/11/2012 0.489 0.154 3.846 0.334 -0.053 0.079 0.000 0.009 0.001 0.008 -0.003 0.019 -0.001 0.010 10/16/2012 0.927 0.098 4.705 0.211 -0.063 0.055 0.002 0.005 -0.004 0.006 -0.002 0.012 -0.007 0.007 COLLECTION DATE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 05/15/2012 -0.008 0.022 0.005 0.011 -0.015 0.019 -0.004 0.014 0.004 0.089 0.001 0.029 0.032 06/19/2012 0.004 0.027 0.002 0.012 0.017 0.022 -0.004 0.012 0.050 0.101 0.004 0.033 0.002 0.020 07/17/2012 -0.022 0.026 0.006 0.012 -0.010 0.021 0.008 0.012 0.039 0.107 -0.006 0.032 -0.013 0.025 08/14/2012 -0.034 0.034 0.005 0.017 0.027 0.029 0.000 0.015 0.115 0.148 0.020 0.038 0.022 0.026 09/11/2012 -0.008 0.022 -0.001 0.009 0.000 0.016 -0.006 0.009 -0.010 0.076 0.003 0.022 0.015 0.017 10/16/2012 0.003 0.014 0.003 0.006 0.005 0.010 0.001 0.006 0.002 0.050 -0.006 0.015 -0.010 0.012 COLLECTION DATE Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228 05/15/2012 -0.005 0.010 0.014 0.012 0.020 0.090 -0.005 0.017 0.029 0.024 -0.046 0.078 0.014 0.053 06/19/2012 -0.012 0.013 0.006 0.014 -0.015 0.060 0.004 0.016 0.002 0.019 -0.010 0.077 0.075 0.057 07/17/2012 -0.011 0.012 0.013 0.012 -0.034 0.062 -0.016 0.018 -0.003 0.021 0.045 0.077 0.057 0.051 08/14/2012 -0.018 0.016 0.010 0.016 -0.033 0.081 0.004 0.024 -0.003 0.019 0.036 0.075 0.100 0.065 09/11/2012 -0.017 0.010 0.018 0.014 0.001 0.044 0.003 0.013 0.004 0.015 -0.024 0.052 0.068 0.042 10/16/2012 -0.001 0.006 0.011 0.006 0.013 0.031 -0.005 0.009 0.012 0.010 -0.011 0.038 0.047 0.043 3-30

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 05/15/2012 1.032 0.207 3.823 0:497 0.093 0.132 -0.001 0.011 -0.001 0.010 0.003 0.024 0.001 0.012 06/19/2012 0.647 0.271 3.226 0.642 0.037 0.152 0.013 0.018 -0.009 0.016 0.006 0.045 -0.009 0.022 07/17/2012 1.439 0.374 2.755 0.760 -0.008 0.250 -0.021 0.028 0.005 0.030 -0.018 0.069 -0.027 0.035 08/14/2012 1.093 0.274 4.185 0.507 -0.025 0.117 -0.003 0.014 -0.012 0.013 -0.008 0.026 0.002 0.015 09/11/2012 1.679 0.240 4.412 0.412 0.011 0.119 0.000 0.011 0.001 0.013 -0.026 0.025 0.007 0.014 10/16/2012 1.847 0.115 3.122 0.198 -0.001 0.053 0.011 0.005 0.000 0.005 -0.011 0.011 -0.006 0.006 COLLECTION DATE Zn-65 "Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 05/15/2012 0.012 0.024 0.008 0.010 0.005 0.024 0.002 0.013 -0.064 0.095 -0.010 0.034 0.030 06/19/2012 -0.024 0.040 0.005 0.020 -0.007 0.034 -0.007 0.018 0.090 0.179 -0.007 0.042 -0.024 0.030 07/17/2012 -0.078 0.060 0.009 0.031 -0.009 0.056 -0.008 0.027 0.010 0.265 0.005 0.069 -0.043 0.052 08/14/2012 -0.030 0.030 -0.004 0.013 -0.005 0.022 0.002 0.012 -0.043 0.122 0.001 0.034 -0.014 0.024 09/11/2012 -0.014 0.029 -0.006 0.012 -0.015 0.020 -0.003 0.013 0.043 0.099 -0.017 0.031 0.000 0.025 10/16/2012 0.004 0.012 -0.001 0.006 0.008 0.014 -0.001 0.006 -0.010 0.046 -0.001 0.015 -0.003 0.011 COLLECTION DATE Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228 05/15/2012 -0.006 0.013 0.013 0.013 0.044 0.080 0.004 0.025 0.010 0.021 -0.064 0.070 0.039 0.051 06/19/2012 0.001 0.021 0.002 0.020 0.089 0.094 -0.020 0.028 0.017 0.022 -0.012 0.084 0.039 0.159 07/17/2012 0.015 0.030 0.011 0.029 -0.065 0.141 -0.001 0.043 -0.010 0.037 -0.016 0.137 0.183 0.131 08/14/2012 -0.001 0.015 -0.006 0.016 0.002 0.061 -0.004 0.014 -0.021 0.025 -0.010 0.092 0.080 0.110 09/11/2012 -0.024 0.011 0.042 0.018 -0.015 0.064 0.004 0.017 0.010 0.021 0.070 0.079 0.007 0.044 10/16/2012 0.004 0.006 0.004 0.006 0.006 0.027 -0.007 0.008 -0.006 0.010 -0.015 0.034 0.407 0.056 3-31

Domnlion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 13 BROADLEAF VEGETATION (pCi/g wet wt.)

LOCATION 26C COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60

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

(+1-)

05115/2012 0.678 0.209 3.760 0.443 0.170 0.126 -0.007 0.011 0.003 0.009 0.000 0.028 0.004 0.012 06/19/2012 1.155 0.218 4.781 0.486 0.087 0.121 0.003 0.013 -0.002 0.012 0.037 0.029 -0.009 0.015 07/17/2012 1.028 0.253 4.128 0.499 -0.032 0.140 -0.003 0.015 0.000 0.016 0.031 0.032 0.000 0.016 08/14/2012 0.787 0.211 4.035 0.445 0.031 0.120 0.001 0.012 -0.001 0.012 0.000 0.025 -0.004 0.014 09/11/2012 2.073 0.169 3.736 0.312 0.037 0.075 0.000 0.008 0.002 0.008 -0.005 0.019 -0.001 0.011 10/16/2012 2.243 0.108 3.104 0.168 0.017 0.050 0.002 0.005 -0.003 0.005 -0.002 0.010 -0.001 0.005 COLLECTION DATE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131

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

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

05/15/2012 -0.013 0.024 -0.014 0.012 0.012 0.019 -0.002 0.011 0.005 0.084 -0.004 0.028 0.035 06/19/2012 -0.009 0.030 -0.001 0.014 -0.017 0.024 0.003 0.014 -0.112 0.137 0.024 0.037 0.001 0.023 07/17/2012 -0.047 0,034 0,000 0.015 0.000 0.027 -0.016 0.015 -0,110 0,126 0.020 0.038 0.005 0.026 08/14/2012 -0.031 0.032 0.008 0.013 -0.010 0.020 -0.008 0.014 -0.043 0.125 -0.009 0.035 -0.006 0.022 09/11/2012 -0.018 0.024 0.001 0.008 -0.001 0.013 0.001 0.008 0.015 0.070 0.018 0.022 0.010 0.017 10/16/2012 0.003 0.012 0.001 0.005 -0.001 0.009 -0.005 0.006 -0.029 0.043 -0.003 0.014 -0.004 0.011 COLLECTION DATE Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

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

(+0-)

05/15/2012 0.003 0.011 0.017 0.012 -0.004 0.076 -0.022 0.024 0.018 0.022 -0.006 0.070 0.032 0.042 06/19/2012 -0.029 0.016 -0.005 0.015 0.035 0.069 0.012 0.017 0.014 0.024 -0.027 0.085 0.019 0.094 07/17/2012 -0.024 0.016 -0.009 0.016 -0.007 0.070 0.012 0.016 -0.016 0.024 -0.055 0.082 -0.015 0.057 08/14/2012 -0.013 0.015 0.009 0.013 0.070 0.063 -0.014 0.018 -0.006 0.023 -0.031 0.086 0.058 0.084 09/11/2012 -0.005 0.009 -0.001 0.008 -0.006 0.042 0.009 0.012 -0.006 0.014 -0.022 0.051 0.037 0.051 10/16/2012 -0.003 0.005 0.006 0.005 0.024 0.028 -0.010 0.007 0.006 0.010 -0.032 0.034 0.064 0.044 3-32

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 14 SEA WATER (pCi/I)

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

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

01/31/2012 248 115 20.2 20.0 241 56 -14.02 24.60 1.37 2.33 -0.762 2.33 0.498 5.05 02/28/2012 314 116 -10.43 21.33 268 62 -0.82 23.64 -0.52 2.30 0.37 2.55 -0.53 5.18 03/27/2012 180 115 -4.93 38.02 261 92 24.25 39.21 3.04 3.88 0.20 4.06 1.84 8.75 04/2412012 o 117 14.31 24.83 249 89 -9.93 29.49 -1.83 3.01 -1.99 2.96 2.51 5.33 05/29/2012 732 159 -19.14 24.58 284 63 10.06 27.68 -1.31 2.48 -0.44 2.72 -1.86 5.55 06/26/2012 0 112 0.86 13.45 268 39 -18.10 16.53 -0.23 1.40 -1.21 1.53 3.42 3.44 07/31/2012 0 117 16.98 35.46 230 89 24.20 42.37 1.36 3.94 2.09 3.97 10.94 8.82 08/28/2012 1180 176 -2.89 19.89 291 59 16.95 24.34 1.05 2.20 0.60 2.15 -0.84 4.69 09/25/2012 452 194 -4.80 11.05 323 34 -7.03 13.38 -0.80 1.12 0.03 1.22 2.88 2.65 10/28/2012 563 222 6.95 12.76 357 40 -5.08 16.89 -0.22 1.21 0.32 1.43 -0.88 3.08 11/27/2012 0 114 23.89 43.38 288 138 -39.27 47.14 3.95 4.95 -1.98 6.11 2.30 11.00 12/26/2012 373 143 -11.69 31.10 28 68 14.75 37.78 1.40 3.40 -3.38 3.83 4.52 8.20 DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125

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

01/31/2012 1.86 2.54 1.02 6.12 0.81 2.27 2.44 3.97 0.36 2.76 19,5 22.9 -0.072 6.24 02/28/2012 -0.23 2.41 2.06 5.73 1.15 2.46 -0.91 4.57 -0.04 2.52 -15.08 22.18 -4.34 6.38 03/27/2012 0.56 4.14 -12.03 9.29 1.19 4.00 6.57 8.77 2.59 4.67 9.26 34.60 0.43 11.12 04/24/2012 -1.01 3.04 0.37 8.22 1.21 3.01 -0.79 5.24 0.95 3.18 11.76 25.65 -1.36 9.00 05/29/2012 0.23 2.90 -7.20 6.67 0.19 2.67 2.60 4.58 2.15 3.12 10.56 24.55 -4.89 7.38 06/26/2012 0.75 1.76 -0.97 3.48 -0.71 1.52 1.53 2.73 -1.56 1.77 -5.06 12.22 1.14 3.40 07/31/2012 1.28 3.77 -0.23 9.06 2.86 4.09 -0.26 7.67 1.64 4.35 12.74 37.43 12.60 11.08 08/28/2012 -0.01 2.34 -2.56 4.71 2.82 2.32 -1.52 3.93 0.25 2.30 -5.71 20.87 -5.24 6.37 09/25/2012 0.62 1.33 -0.17 2.80 0.62 1.27 2.01 2.08 -0.34 1.39 3.42 10.48 1.87 3.02 10/28/2012 0.24 1.37 -6.50 2.93 0.80 1.50 0.50 2.49 -1.43 1.67 -9.39 11.32 -0.23 3.69 11/27/2012 1.41 5.08 -4.66 11.12 -4.13 5.08 1.79 8.44 -0.16 5.11 20.84 49.28 -1.80 13.03 12/26/2012 0.39 3.19 3.17 8.32 0.77 3.89 0.66 6.84 -1.45 4.38 -6.24 32.04 -10.17 11.66 DATE 1-131 Cs-134 Cs-137 Ba-140 La-140 Ac-228

(+/-)

01/31/2012 4.93 5.79 -1.53 2.82 -2.13 2.62 -3.01 13.6 -4.23 4.40 -4.45 9.74 02/28/2012 1.20 4.28 -1.68 2.84 2.63 2.74 1.10 11.88 -2.84 3.43 3.74 11.13 03/27/2012 2.85 7.47 -5.53 4.32 -2.21 4.50 0.60 22.82 0.84 6.61 9.71 18.66 04/24/2012 1.40 5.83 -1.32 3.27 -2.40 3.21 2.47 14.76 1.15 5.06 2.40 12.92 05/29/2012 -3.67 9.06 0.72 2.55 -0.31 2.81 8.88 20.11 0.66 5.06 -1.39 10.09 06/26/2012 2.29 6.82 -5.33 1.39 -0.43 1.35 -8.60 12.35 0.79 4.68 0.18 7.80 07/31/2012 0.16 8.63 0.14 3.99 0.81 4.05 11.38 22.41 4.86 6.55 -13.50 14.88 08/28/2012 -3.28 4.24 0.15 2.59 -0.34 2.40 0.09 11.21 3.00 3.18 2.06 8.49 09/25/2012 -3.92 4.26 1.87 1.20 -1.52 1.19 -2.41 8.64 0.92 2.81 0.56 5.10 10/28/2012 -2.70 6.20 -0.11 1.36 0.46 1.26 1.76 11.52 -3.39 3.66 1.00 5.38 11/27/2012 4.23 9.82 -2.89 4.24 -1.56 5.31 8.08 25.92 -6.15 9.05 12.01 19.27 12/26/2012 4.14 7.96 -0.31 3.88 -3.19 3.55 -13.30 20.10 -4.86 6.78 25.67 15.83 3-33

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 14 SEA WATER (pCi/I)

LOCATION 37C COLLECTION DATE H-3 Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 03/20/2012 -86 109 1.15 30.25 215 76 -23.17 29.57 2.57 3.07 0.76 3.87 1.20 7.76 06/12/2012 -19 113 -11.64 34.27 260 94 0.58 35.61 3.33 3.17 -0.52 3.56 -5.16 7.31 08/14/2012 -36 103 29.13 34.52 250 108 16.14 38.86 0.82 3.85 1.04 4.56 -0.93 8.94 11/13/2012 47 107 -19.80 30.50 221 84 -6.89 31.16 2.51 3.00 -2.44 3.56 0.24 6.41 236.6 DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 03/20/2012 1.02 3.64 -10.16 8.36 1.27 3.58 -3.55 5.90 -2.64 3.84 -0.21 31.16 4.60 8.95 06/12/2012 -1.18 3.50 -6.98 8.10 -1.01 3.74 -3.29 6.73 -2.74 4.15 22.77 34.94 1.16 9.25 08/14/2012 0.28 4.39 -5.26 9.67 0.12 4.34 1.02 6.90 -3.04 4.68 9.20 36.84 8.28 11.21 11/13/2012 2.06 3.08 -1.55 7.00 6.74 3.90 -2.03 5.90 -1.29 3.60 -2.61 29.39 -0.61 9.77 DATE 1-131 Cs- 134 Cs-137 Ba-140 La-140 Ac-228 03/20/2012 2.09 6.27 -1.59 4.05 0.19 3.70 9.80 16.46 1.26 6.19 13.92 13.28 06/12/2012 0.96 5.92 2.20 3.62 0.71 3.65 -4.52 17.60 -2.60 4.68 -3.49 13.10 08/14/2012 11.72 10.66 -2.97 4.50 1.94 4.03 -20.64 26.50 4.41 8.16 -15.52 14.46 11/13/2012 0.29 6.23 -0.42 3.31 -1.69 3.47 7.33 17.13 3.31 4.93 1.03 13.16 3-34

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

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

(+3-)

31 02/21/2012 -0.014 0.154 20.43 0.94 0.108 0.160 0.023 0.020 -0.011 0.019 -0.038 0.043 31 10/22/2012 0.014 0.301 15.39 1.16 0.308 0.327 -0.021 0.033 0.019 0.034 0.027 0.072 32 06/28/2012 0.342 0.369 14.93 1.45 -0.245 0.517 0.022 0.039 0.005 0.044 -0.059 0.099 32 10/17/2012 0.102 0.366 18.32 1.50 0.018 0.415 -0.026 0.040 0.004 0.043 0.026 0.094 33 02/22/2012 -0.061 0.140 17.22 0.90 0.016 0.140 0.001 0.019 0.007 0.019 0.022 0.043 33 10/24/2012 0.051 0.264 14.62 1.08 -0.135 0.253 0.019 0.029 -0.004 0.032 0.001 0.065 34 02/21/2012 0.130 0.162 14.80 0.80 -0.114 0.169 0.015 0.018 -0.004 0.019 0.003 0.041 34 10/24/2012 0.147 0.212 16.84 1.25 -0.156 0.224 -0.023 0.024 -0.023 0.025 -0.020 0.060 39 06/29/2012 0.081 0.341 20.53 1.54 -0.088 0.426 0.037 0.035 -0.004 0.039 0.040 0.096 39 10/17/2012 0.015 0.251 16.98 1.25 0.110 0.314 0.009 0.032 -0.034 0.031 0.050 0.073 37 02/22/2012 0.010 0.129 17.11 0.95 0.104 0.150 0.006 0.018 -0.006 0.017 -0.020 0.042 37 10/22/2012 0.001 0.265 16.49 1.29 -0.102 0.268 -0.017 0.034 -0.009 0.031 -0.035 0.072 67 02/22/2012 0.129 0.223 22.52 1.15 0.150 0.250 0.004 0.028 0.007 0.026 0.011 0.060 67 11/30/2012 0.078 0.161 23.33 0.91 0.093 0.170 0.014 0.019 -0.006 0.019 -0.023 0.044 3-35

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

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

(+3-) (+1-)

31 02/21/2012 0.006 0.023 -0.025 0.051 -0.022 0.019 -0.026 0.033 -0.001 0.018 -0.053 0.162 31 10/22/2012 -0.036 0.036 -0.088 0.083 -0.013 0.035 0.005 0.059 -0.008 0.039 -0.016 0.320 32 06/28/2012 0.001 0.045 0.021 0.093 0.016 0.049 -0.010 0.082 0.007 0.049 -0.217 0.354 32 10/17/2012 0.008 0.049 -0.011 0.098 0.005 0.042 0.005 0.077 -0.041 0.044 0.135 0.350 33 02/2212012 0.015 0.025 0.002 0.054 0.013 0.021 0.030 0.031 0.006 0.017 -0.001 0.148 33 10/24/2012 -0.022 0.040 -0.026 0.087 0.019 0.033 -0.002 0.053 -0.010 0.030 -0.008 0.258 34 02/21/2012 -0.011 0.024 -0.001 0.050 0.015 0.019 0.017 0.031 -0.011 0.019 -0.061 0.167 34 10/24/2012 0.021 0.033 -0.029 0.070 0.002 0.030 -0.027 0.049 -0.016 0.028 -0.119 0.231 37 02/22/2012 0.003 0.024 -0.008 0.052 0.007 0.018 0.033 0.030 -0.002 0.016 -0.023 0.146 37 10/22/2012 -0.061 0.043 -0.144 0.085 0.009 0.037 0.078 0.061 -0.018 0.033 - -0.124 0.296 39 06/29/2012 0.022 0.047 -0.159 0.106 0.090 0.044 0.021 0.067 0.002 0.041 0.236 0.313 39 10/17/2012 0.024 0.035 0.036 0.074 0.015 0.036 0.002 0.056 0.006 0.034 0.128 0.265 67 02/22/2012 -0.017 0.037 -0.025 0.075 0.031 0.028 0.000 0.046 0.007 0.028 0.027 0.233 67 11/30/2012 -0.014 0.026 0.010 0.052 0.026 0.021 0.020 0.034 -0.001 0.020 -0.036 0.151 3-36

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

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

(+/-)

31 02/21/2012 -0.019 0.018 0.009 0.045 0.013 0.029 -0.003 0.020 0.023 0.021 0.942 0.158 31 10/22/2012 0.027 0.034 0.051 0.099 -0.051 0.072 0.018 0.037 -0.003 0.037 1.239 0.257 32 06/28/2012 -0.031 0.038 -0.067 0.102 0.015 0.219 0.008 0.040 0.040 0.042 0.139 0.344 32 10/17/2012 -0.003 0.040 0.021 0.098 -0.031 0.118 0.002 0.044 0.141 0.066 0.874 0.306 33 02/22/2012 -0.018 0.017 0.009 0.044 -0.028 0.025 0.001 0.018 0.021 0.019 0.251 0.106 33 10/24/2012 -0.028 0.030 -0.026 0.081 0.015 0.051 -0.012 0.033 0.019 0.032 0.134 0.246 34 02/21/2012 -0.005 0.018 -0.015 0.049 -0.009 0.031 -0.007 0.020 0.001 0.020 0.007 0.131 34 10/24/2012 -0.025 0.022 0.034 0.067 -0.005 0.043 -0.012 0.028 0.000 0.026 0.065 0.239 37 02/22/2012 -0.002 0.017 0.002 0.042 -0.001 0.025 0.004 0.017 0.001 0.019 0.077 0.149 37 10/22/2012 0.034 0.031 -0.025 0.077 0.029 0.059 0.008 0.031 -0.024 0.034 0.258 0.371 39 06/29/2012 -0.050 0.036 0.008 0.081 0.031 0.166 0.013 0.035 0.016 0.039 0.643 0.207 39 10/17/2012 -0.015 0.032 -0.035 0.074 -0.055 0.092 0.015 0.031 0.005 0.035 1.040 0.201 67 02/22/2012 -0.030 0.027 -0.057 0.071 -0.016 0.041 0.009 0.028 0.038 0.028 0.117 0.204 67 11/30/2012 -0.023 0.018 -0.008 0.046 -0.030 0.048 0.000 0.020 0.018 0.020 0.054 0.161 3-37

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 03/14/2012 0.0718 0.0593 6.7880 0.3514 0.0198 0.0591 0.0037 0.0066 0.0030 0.0072 0.0160 0.0174 29 06/06/2012 0.1269 0.1088 6.6340 0.5444 0.0275 0.1069 -0.0036 0.0115 0.0062 0.0132 -0.0025 0.0304 29 09/07/2012 0.0854 0.0281 6.2230 0.1111 -0.0055 0.0264 0.0015 0.0022 0.0004 0.0025 -0.0029 0.0061 29 12/19/2012 0.2648 0.0408 7.0060 0.1415 -0.0042 0.0304 -0.0003 0.0027 -0.0005 0.0030 0.0022 0.0084 32 02/21/2012 -0.0075 0.1202 8.7370 0.6743 0.0214 0.1208 -0.0002 0.0157 0.0052 0.0154 0.0213 0.0342 32 05/24/2012 0.1870 0.0978 6.4480 0.6397 -0.0370 0.1023 0.0027 0.0118 0.0075 0.0130 0.0152 0.0285 32 07/26/2012 0.0916 0.0466 8.1220 0.2040 -0.0182 0.0389 0.0015 0.0040 0.0050 0.0043 -0.0031 0.0108 32 10/24/2012 0.1776 0.0942 8.5820 0.5395 0.0225 0.0903 -0.0004 0.0118 -0.0041 0.0113 -0.0210 0.0266 35 02/21/2012 0.1084 0.0912 5.9730 0.5331 0.0032 0.0855 0.0014 0.0110 -0.0016 0.0134 -0.0008 0.0267 35 06/21/2012 0.1200 0.0707 6.7820 0.2061 0.0214 0.0557 0.0036 0.0044 -0.0045 0.0050 -0.0030 0.0130 35 08/21/2012 0.1463 0.0668 5.9300 0.2324 0.0006 0.0432 -0.0002 0.0051 0.0004 0.0048 -0.0057 0.0111 35 11/29/2012 0.0663 0.0448 7.5570 0.1891 0.0240 0.0384 0.0022 0.0035 -0.0019 0.0036 0.0038 0.0085 36 03/14/2012 0.1326 0.1047 5.7980 0.3667 -0.0257 0.0735 0.0050 0.0078 -0.0037 0.0076 -0.0010 0.0180 36 05/24/2012 0.0490 0.1086 6.2550 0.5924 -0.0473 0.1159 -0.0058 0.0116 0.0017 0.0104 0.0136 0.0277 36 08/22/2012 0.1048 0.0865 6.1320 0.3278 0.0004 0.0726 -0.0033 0.0068 0.0023 0.0070 0.0129 0.0160 36 11/29/2012 0.0934 0.0508 6.2520 0.2147 -0.0122 0.0560 -0.0038 0.0053 -0.0060 0.0056 -0.0052 0.0120 90 02/21/2012 0.2004 0.1143 5.6030 0.3771 0.0248 0.0764 0.0038 0.0085 0.0020 0.0083 -0.0002 0.0209 90 05/23/2012 0.1306 0.1128 6.2710 0.3505 0.0736 0.0892 0.0044 0.0075 -0.0024 0.0079 0.0087 0.0211 90 08/21/2012 0.1470 0.0967 6.3690 0.3356 -0.0185 0.0670 -0.0014 0.0082 0.0016 0.0081 -0.0097 0.0201 90 10/24/2012 0.3268 0.1831 7.9100 0.6060 0.0539 0.1067 -0.0078 0.0144 -0.0013 0.0148 0.0064 0.0341 3-38

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 03/14/2012 -0.0018 0.0099 -0.0109 0.0177 0.0011 0.0067 0.0030 0.0125 -0.0012 0.0068 -0.0216 0.0615 29 06/06/2012 0.0036 0.0159 -0.0310 0.0339 -0.0045 0.0142 0.0047 0.0226 0.0061 0.0131 -0.0090 0.1110 29 09/0712012 0.0030 0.0030 -0.0016 0.0065 0.0016 0.0025 0.0015 0.0043 0.0018 0.0031 -0.0015 0.0190 29 12/19/2012 -0.0002 0.0044 -0.0105 0.0075 0.0006 0.0031 0.0027 0.0054 -0.0005 0.0033 -0.0103 0.0243 32 02/21/2012 0.0080 0.0201 -0.0484 0.0384 -0.0163 0.0157 -0.0134 0.0294 -0.0010 0.0149 -0.0304 0.1399 32 05/24/2012 -0.0178 0.0156 -0.0207 0.0326 -0.0068 0.0117 -0.0077 0.0221 0.0012 0.0115 0.0870 0.0937 32 07/26/2012 0.0004 0.0057 -0.0218 0.0113 0.0039 0.0044 -0.0032 0.0079 -0.0032 0.0042 0.0147 0.0355 32 10/24/2012 0.0131 0.0154 -0.0062 0.0294 0.0074 0.0111 0.0031 0.0197 -0.0008 0.0101 -0.0297 0.0993 35 02/21/2012 0.0002 0.0147 -0.0074 0.0325 -0.0016 0.0125 -0.0083 0.0210 -0.0041 0.0113 -0.0146 0.1095 35 06/21/2012 0.0042 0.0059 -0.0087 0.0117 0.0002 0.0050 0.0025 0.0090 -0.0019 0.0057 0.0097 0.0398 35 08121/2012 0.0032 0.0064 -0.0163 0.0120 -0.0007 0.0050 0.0035 0.0084 -0.0013 0.0048 0.0002 0.0397 35 11/29/2012 -0.0009 0.0043 0.0050 0.0095 0.0004 0.0038 0.0010 0.0067 0.0006 0.0040 0.0118 0.0313 36 03/14/2012 0.0060 0.0099 -0.0232 0.0182 0.0038 0.0074 0.0002 0.0130 -0.0028 0.0076 0.0058 0.0647 36 05/24/2012 -0.0022 0.0136 -0.0117 0.0258 0.0054 0.0097 0.0031 0.0177 -0.0022 0.0132 0.0736 0.1123 36 08/22/2012 0.0013 0.0080 -0.0140 0.0175 0.0038 0.0073 0.0061 0.0117 -0.0019 0.0075 0.0401 0.0603 36 11/29/2012 0.0025 0.0059 -0.0002 0.0136 0.0057 0.0058 0.0009 0.0097 0.0009 0.0060 -0.0121 0.0465 90 02/21/2012 0.0002 0.0104 -0.0326 0.0224 0.0070 0.0084 0.0165 0.0142 -0.0016 0.0087 0.0248 0.0741 90 05/23/2012 0.0058 0.0095 -0.0094 0.0189 0.0064 0.0083 0.0039 0.0145 -0.0041 0.0095 0.0742 0.0733 90 08/21/2012 -0.0058 0.0112 0.0158 0.0231 0.0078 0.0084 -0.0051 0.0143 -0.0024 0.0082 -0.0079 0.0652 90 10/24/2012 -0.0153 0.0184 -0.0317 0.0365 -0.0058 0.0147 -0.0122 0.0253 -0.0026 0.0139 0.0416 0.1230 3-39

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 16 AQUATIC FLORA - FUCUS (pCi/g wet wt.)

COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-134 Cs-137 Ac-228 29 03/14/2012 0.0017 0.0066 -0.0098 0.0174 0.0367 0.0155 -0.0119 0.0082 0.0040 0.0067 0.0696 0.0464 29 06/06/2012 -0.0023 0.0109 -0.0002 0.0305 0.0041 0.0234 0.0029 0.0136 -0.0130 0.0125 0.0313 0.0737 29 09/07/2012 0.0005 0.0021 0.0019 0.0055 0.0014 0.0100 -0.0005 0.0024 0.0000 0.0023 0.0383 0.0169 29 12/19/2012 0.0017 0.0025 0.0029 0.0065 0.0185 0.0156 -0.0029 0.0028 -0.0005 0.0028 0.0589 0.0194 32 02/21/2012 0.0080 0.0142 0.0042 0.0377 0.0164 0.0225 -0.0008 0.0161 -0.0018 0.0161 0.0417 0.0594 32 05/24/2012 0.0099 0.0119 -0.0153 0.0268 0.0039 0.0344 -0.0017 0.0109 -0.0103 0.0141 0.0525 0.0525 32 07/26/2012 -0.0032 0.0039 -0.0082 0.0098 0.0238 0.0151 -0.0009 0.0045 0.0013 0.0042 0.0476 0.0245 32 10/2412012 -0.0038 0.0118 0.0068 0.0280 0.0162 0.0174 0.0019 0.0119 -0.0031 0.0131 0.0730 0.0832 35 02/21/2012 -0.0058 0.0107 0.0002 0.0283 0.0112 0.0173 -0.0004 0.0129 0.0033 0.0119 0.0344 0.0563 35 06/21/2012 0.0012 0.0043 -0.0011 0.0112 0.0329 0.0281 -0.0147 0.0046 -0.0021 0.0046 0.0188 0.0307 35 08/21/2012 -0.0018 0.0043 -0.0015 0.0121 0.0258 0.0138 -0.0011 0.0050 0.0028 0.0047 0.0109 0.0363 35 11/29/2012 0.0017 0.0034 0.0020 0.0094 0.0056 0.0108 0.0007 0.0036 -0.0023 0.0038 0.0780 0.0341 36 03/14/2012 0.0039 0.0071 0.0125 0.0211 0.0053 0.0136 0.0002 0.0079 -0.0029 0.0077 0.0473 0.0322 36 05/24/2012 0.0047 0.0097 -0.0047 0.0296 -0.0024 0.0346 -0.0059 0.0100 -0.0039 0.0105 0.0863 0.0912 36 08/22/2012 -0.0018 0.0067 0.0059 0.0199 0.0009 0.0147 -0.0008 0.0073 0.0061 0.0072 0.0146 0.0508 36 11/29/2012 0.0022 0.0049 0.0103 0.0140 0.0082 0.0157 -0.0031 0.0058 -0.0023 0.0053 0.0981 0.0342 90 02/21/2012 -0.0041 0.0076 0.0136 0.0231 0.0311 0.0220 -0.0190 0.0090 0.0001 0.0083 0.0444 0.0402 90 05/23/2012 0.0041 0.0066 -0.0003 0.0213 0.0157 0.0263 -0.0030 0.0088 -0.0005 0.0079 0.0737 0.0471 90 08/21/2012 -0.0022 0.0069 0.0053 0.0197 0.3548 0.0313 0.0021 0.0078 0.0002 0.0075 0.0591 0.0446 90 10/24/2012 -0.0098 0.0133 0.0085 0.0319 0.1313 0.0390 -0.0088 0.0138 0.0077 0.0142 0.0695 0.0975 3-40

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 17A FISH - FLOUNDER (pCi/g wet wt.)

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

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

29 07/1 7/2012 0.030 0.078 4.71 0.30 -0.035 0.098 -0.001 0.008 -0.003 0.009 -0.002 0.021 32 05/25/2012 -0.007 0.079 5.01 0.28 0.106 0.099 -0.003 0.008 -0.008 0.009 0.014 0.020 32 10/24/2012 0.032 0.214 4.81 0.85 -0.024 0.221 0.005 0.021 -0.008 0.025 0.023 0.047 35 08/13/2012 0.013 0.158 4.35 0.58 0.135 0.159 -0.009 0.019 0.006 0.018 -0.015 0.040 35 10/09/2012 -0.044 0.203 4.72 0.65 -0.055 0.212 -0.007 0.022 -0.017 0.022 0.001 0.051 35 10/24/2012 0.000 0.226 4.13 0.90 0.015 0.245 -0.021 0.024 -0.023 0.025 -0.003 0.048 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 29 07/17/2012 0.000 0.009 0.015 0.021 -0.010 0.009 -0.004 0.016 0.003 0.010 0.032 0.074 32 05/25/2012 -0.001 0.009 0.012 0.022 0.018 0.010 0.008 0.017 0.002 0.010 -0.007 0.075 32 10/24/2012 -0.014 0.029 0.000 0.065 0.010 0.026 0.004 0.040 -0.022 0.026 0.009 0.247 35 08/13/2012 0.005 0.022 0.020 0.045 0.009 0.019 0.016 0.031 0.003 0.018 -0.089 0.149 35 10/09/2012 0.004 0.024 -0.099 0.057 0.019 0.023 0.000 0.040 0.001 0.024 0.034 0.209 35 10/24/2012 0.005 0.027 0.019 0.056 -0.015 0.033 0.005 0.050 -0.004 0.030 -0.039 0.266 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-134 Cs-137 Ac-228

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

29 07/17/2012 0.001 0.008 -0.006 0.020 0.003 0.050 0.003 0.009 0.000 0.009 0.002 0.042 32 05/25/2012 -0.009 0.008 0.001 0.021 -0.003 0.044 0.004 0.010 0.002 0.009 0.033 0.045 32 10/24/2012 -0.002 0.021 0.008 0.063 -0.006 0.039 0.003 0.025 0.019 0.023 -0.074 0.100 35 08/13/2012 0.002 0.018 -0.046 0.050 -0.008 0.032 0.000 0.021 0.014 0.020 -0.032 0.069 35 10/09/2012 0.009 0.021 0.026 0.062 0.028 0.045 -0.004 0.028 -0.006 0.023 -0.055 0.095 35 10/24/2012 -0.002 0.024 -0.022 0.075 0.004 0.046 0.021 0.027 -0.004 0.031 0.017 0.100 3-41

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 17B FISH - OTHER (pCi/g wet wt.)

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

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

29 10/09/2012 0.035 0.173 4.40 0.58 -0.058 0.182 -0.001 0.018 0.002 0.019 -0.034 0.040 32 04/19/2012 0.056 0.101 3.58 0.33 -0.011 0.123 0.001 0.011 0.000 0.012 -0.004 0.026 32 10/24/2012 0.123 0.243 5.17 0.93 0.137 0.248 0.021 0.024 -0.012 0.028 0.027 0.046 35 04/24/2012 0.070 0.108 3.74 0.46 0.073 0.117 0.005 0.011 -0.006 0.011 0.001 0.022 35 05/07/2012 0.014 0.109 4.83 0.37 -0.082 0.115 -0.006 0.013 0.004 0.014 0.007 0.025 35 07/27/2012 -0.016 0.086 4.42 0.32 -0.084 0.104 -0.005 0.010 -0.006 0.011 0.002 0.022 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

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

29 10/09/2012 0.007 0.021 -0.040 0.050 0.009 0.022 -0.004 0.033 -0.003 0.019 0.011 0.177 32 04/19/2012 0.009 0.012 0.010 0.025 0.010 0.012 0.002 0.020 0.002 0.013 0.003 0.100 32 10/24/2012 0.007 0.023 0.000 0.053 0.004 0.024 0.026 0.048 -0.028 0.028 0.039 0.235 35 04/24/2012 0.001 0.011 -0.010 0.023 0.006 0.012 -0.008 0.020 -0.014 0.013 -0.135 0.103 35 05/07/2012 -0.005 0.013 0.016 0.028 0.015 0.013 0.016 0.022 0.001 0.014 -0.069 0.110 35 07/27/2012 0.006 0.014 0.004 0.024 0.005 0.011 0.011 0.018 -0.006 0.011 -0.062 0.087 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-134 Cs-137 Ac-228

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

(+.-)

29 10/09/2012 0.014 0.017 0.027 0.052 0.003 0.040 -0.003 0.023 0.005 0.020 -0.050 0.074 32 04/19/2012 -0.004 0.010 0.014 0.029 -0.028 0.037 -0.014 0.013 0.000 0.012 -0.004 0.052 32 10/24/2012 0.021 0.023 -0.024 0.072 -0.033 0.045 -0.014 0.029 0.010 0.026 -0.030 0.109 35 04/24/2012 -0.006 0.011 0.007 0.031 -0.018 0.024 0.002 0.012 0.000 0.015 0.045 0.057 35 05/07/2012 0.011 0.012 0.004 0.034 -0.023 0.026 -0.009 0.014 -0.002 0.014 0.016 0.086 35 07/27/2012 0.000 0.009 0.002 0.024 0.024 0.038 -0.004 0.011 0.002 0.010 0.012 0.072 3-42

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 18 MUSSELS (pCi/g wet wt.)

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

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

30 03/08/2012 0.132 0.086 2.264 0.192 -0.010 0.078 -0.003 0.007 0.000 0.007 0.010 0.015 30 05/16/2012 0.597 0.289 1.421 0.469 -0.064 0.206 0.000 0.021 0.002 0.021 0.021 0.038 30 08/29/2012 0.118 0.161 0.942 0.415 0.021 0.174 -0.011 0.018 -0.001 0.018 0.002 0.037 35 06/21/2012 -0.312 0.532 1.520 0.914 0.017 0.716 0.037 0.045 0.021 0.058 -0.061 0.115 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

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

30 03/08/2012 0.000 0.007 -0.009 0.017 -0.003 0.010 0.015 0.013 0.002 0.008 -0.027 0.066 30 05/16/2012 -0.007 0.018 -0.043 0.047 0.000 0.020 -0.002 0.036 0.021 0.022 -0.094 0.182 30 08/29/2012 0.004 0.017 -0.028 0.040 -0.007 0.019 0.004 0.034 0.022 0.019 -0.084 0.181 35 06/21/2012 0.028 0.050 -0.098 0.116 0.059 0.065 0.042 0.107 -0.009 0.072 -0.130 0.407 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-1 34 Cs-137 Ac-228

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

30 03/08/2012 0.001 0.007 0.009 0.019 0.002 0.022 -0.006 0.008 0.001 0.007 0.028 0.039 30 05/16/2012 0.006 0.018 0.014 0.053 0.018 0.052 -0.053 0.024 -0.004 0.020 0.033 0.074 30 08/29/2012 0.008 0.017 -0.019 0.049 0.005 0.034 -0.006 0.022 0.001 0.019 0.072 0.153 35 06/21/2012 0.011 0.046 -0.037 0.143 0.041 0.411 -0.037 0.055 -0.030 0.049 -0.135 0.185 3-43

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 19 OYSTERS (pCi/g wet wt.)

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

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

31 03/28/2012 -0.086 0.229 2.16 0.68 -0.083 0.216 -0.008 0.027 0.001 0.023 -0.011 0.050 31 06/28/2012 0.067 0.091 2.37 0.25 0.051 0.115 -0.002 0.009 -0.007 0.012 0.014 0.020 31 09/26/2012 0.001 0.155 1.67 0.54 -0.009 0.170 0.013 0.018 0.002 0.020 -0.036 0.040 31 12/03/2012 0.023 0.077 2.47 0.25 -0.047 0.083 0.005 0.009 0.000 0.009 -0.001 0.018 32 02/21/2012 0.032 0.135 2.08 0.39 -0.093 0.135 0.005 0.014 0.008 0.013 0.035 0.031 32 06/28/2012 0.006 0.091 1.75 0.22 0.056 0.112 -0.005 0.009 -0.004 0.010 0.014 0.019 32 09/29/2012 0.065 0.186 1.63 0.40 -0.069 0.192 0.003 0.015 -0.010 0.020 0.024 0.040 32 12/12/2012 0.047 0.224 1.86 0.43 0.016 0.248 -0.003 0.023 0.002 0.022 0.009 0.043 34 01/17/2012 -0.001 0.083 1.89 0.26 0.017 0.099 -0.003 0.009 -0.002 0.010 -0.018 0.020 36 06/28/2012 0.008 0.065 1.51 0.20 -0.052 0.082 0.005 0.007 -0.001 0.008 -0.009 0.017 37C 01/20/2012 0.022 0.053 1.52 0.16 0.003 0.060 0.006 0.006 -0.004 0.006 0.003 0.012 37C 03/30/2012 0.053 0.165 1.48 0.34 -0.094 0.191 0.011 0.015 -0.007 0.019 -0.023 0.035 37C 06/28/2012 -0.002 0.049 1.47 0.17 -0.017 0.053 0.000 0.005 0.006 0.006 -0.008 0.012 37C 09/28/2012 -0.088 0.215 1.52 0.53 0.135 0.228 -0.012 0.023 -0.022 0.024 -0.018 0.050 37C 12/05/2012 0.033 0.089 2.11 0.28 0.052 0.101 -0.001 0.010 -0.014 0.010 -0.023 0.021 88 03/28/2012 -0.126 0.292 2.11 0.81 -0.143 0.271 -0.011 0.030 -0.007 0.031 -0.018 0.059 88 09/26/2012 0.008 0.160 2.05 0.39 0.054 0.171 -0.007 0.016 0.013 0.018 -0.021 0.039 88 12/05/2012 0.021 0.033 2.15 0.21 0.022 0.035 0.002 0.003 -0.003 0.004 -0.005 0.008 3-44

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 19 OYSTERS (pCi/g wet wt.)

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

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

31 03/28/2012 -0.016 0.023 -0.016 0.056 0.009 0.026 -0.005 0.046 -0.009 0.025 -0.145 0.221 06/28/2012 0.007 0.009 -0.048 0.021 0.002 0.011 -0.013 0.019 0.009 0.012 0.061 0.087 31 31 09/26/2012 0.007 0.023 -0.066 0.044 -0.013 0.019 0.009 0.036 0.003 0.020 -0.085 0.161 31 12/03/2012 0.010 0.010 0.004 0.021 0.007 0.009 0.008 0.016 -0.005 0.009 0.014 0.081 32 02/21/2012 0.003 0.016 -0.026 0.034 -0.005 0.014 -0.001 0.026 0.000 0.015 -0.014 0.118 32 06/28/2012 -0.001 0.008 0.013 0.021 0.033 0.011 0.001 0.018 -0.013 0.012 0.008 0.083 32 09/2912012 0.000 0.018 -0.056 0.044 -0.007 0.019 0.011 0.029 0.012 0.022 -0.053 0.163 32 12/12/2012 -0.011 0.023 -0.030 0.050 0.121 0.031 -0.015 0.049 -0.007 0.028 0.051 0.240 34 01/17/2012 0.014 0.009 0.020 0.021 0.011 0.010 0.001 0.017 -0.006 0.010 -0.018 0.081 36 06/28/2012 -0.002 0.007 -0.005 0.016 0.008 0.008 0.007 0.013 0.001 0.008 -0.003 0.062 37 01/20/2012 -0.004 0.006 -0.005 0.014 0.007 0.006 -0.008 0.010 -0.001 0.007 0.021 0.050 37 03/30/2012 0.006 0.014 -0.008 0.037 -0.011 0.021 -0.007 0.030 -0.006 0.021 0.001 0.157 37 06/28/2012 0.003 0.007 -0.004 0.014 0.003 0.006 -0.003 0.010 -0.002 0.006 0.037 0.044 37 09/28/2012 0.002 0.022 -0.069 0.053 0.021 0.022 0.021 0.039 0.008 0.027 -0.022 0.216 37 12/05/2012 0.000 0.011 -0.006 0.025 0.017 0.012 0.001 0.018 -0.001 0.011 -0.021 0.093 88 03/28/2012 0.037 0.031 0.023 0.068 -0.016 0.030 0.045 0.057 0.026 0.033 -0.002 0.288 88 09/26/2012 0.015 0.018 -0.022 0.039 -0.006 0.019 -0.039 0.030 -0.018 0.019 0.000 0.145 88 12/05/2012 0.000 0.004 0.003 0.008 -0.004 0.004 -0.001 0.006 0.001 0.004 -0.008 0.036 3-45

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 19 OYSTERS (pCi/g wet wt.)

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

(+0-)

31 03/28/2012 -0.002 0.025 -0.016 0.068 0.002 0.039 -0.012 0.028 -0.004 0.027 0.006 0.094 31 06/28/2012 -0.008 0.009 0.001 0.025 -0.001 0.043 -0.010 0.012 -0.001 0.010 -0.047 0.041 31 09/26/2012 0.009 0.017 0.050 0.044 -0.005 0.061 0.002 0.019 -0.010 0.019 -0.005 0.070 31 12/03/2012 0.002 0.008 0.007 0.023 -0.006 0.018 -0.004 0.010 -0.003 0.009 -0.012 0.037 32 02/21/2012 0.012 0.015 0.017 0.042 -0.003 0.025 0.005 0.016 -0.012 0.016 0.002 0.104 32 06/28/2012 0.084 0.011 -0.005 0.025 -0.003 0.043 -0.011 0.010 0.005 0.012 0.002 0.052 32 09/29/2012 -0.008 0.017 0.045 0.051 -0.038 0.047 -0.006 0.021 0.004 0.018 -0.035 0.073 32 12/12/2012 0.335 0.033 -0.090 0.072 0.040 0.055 -0.017 0.030 0.031 0.030 -0.055 0.088 34 01/17/2012 -0.002 0.009 0.005 0.023 -0.012 0.031 -0.007 0.010 0.009 0.010 0.021 0.098 36 06/28/2012 -0.006 0.007 0.002 0.018 -0.007 0.031 0.002 0.007 0.001 0.007 0.003 0.029 37 01/20/2012 0.006 0.005 -0.020 0.016 -0.011 0.016 0.005 0.006 -0.004 0.006 -0.015 0.027 37 03/30/2012 -0.003 0.017 -0.028 0.049 0.007 0.053 0.004 0.017 0.003 0.018 0.090 0.112 37 06/28/2012 -0.002 0.005 -0.010 0.013 -0.002 0.021 -0.002 0.006 0.006 0.006 0.015 0.034 37 09/28/2012 0.002 0.021 -0.019 0.057 -0.068 0.064 -0.030 0.026 0.004 0.022 0.116 0.111 37 12/05/2012 -0.013 0.010 0.006 0.029 -0.005 0.020 -0.006 0.012 -0.018 0.013 0.012 0.060 88 03/28/2012 0.016 0.029 -0.034 0.087 -0.018 0.052 -0.004 0.036 -0.024 0.030 0.083 0.124 88 09/26/2012 0.002 0.014 -0.037 0.043 -0.003 0.052 -0.005 0.018 -0.003 0.016 -0.026 0.070 88 12/05/2012 0.005 0.004 0.002 0.010 0.003 0.006 -0.001 0.004 0.002 0.005 -0.021 0.022 3-46

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 20 CLAMS (pCi/g wet wt.)

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

(+/-)

29 03/14/2012 0.067 0.052 2.39 0.19 0.028 0.057 -0.005 0.006 -0.003 0.006 0.013 0.012 29 06/06/2012 0.030 0.135 1.93 0.51 0.028 0.180 0.006 0.018 0.008 0.016 0.026 0.034 29 07/24/2012 0.036 0.083 1.95 0.26 -0.014 0.092 0.001 0.009 0.003 0.010 0.001 0.019 29 11/30/2012 0.049 0.080 2.52 0.31 0.027 0.093 0.004 0.010 -0.005 0.010 -0.004 0.020 38 03/30/2012 -0.031 0.178 2.23 0.63 0.042 0.225 -0.018 0.019 0.003 0.021 -0.014 0.041 38 06/08/2012 0.182 0.179 1.85 0.47 -0.074 0.196 0.004 0.019 0.006 0.017 -0.035 0.042 38 09/27/2012 0.071 0.171 2.22 0.50 0.045 0.200 -0.011 0.019 -0.008 0.021 0.007 0.042 38 12/20/2012 0.001 0.089 2.10 0.29 -0.064 0.115 0.001 0.009 0.000 0.010 -0.002 0.021 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-)

29 03/14/2012 0.004 0.006 0.009 0.014 -0.002 0.006 0.009 0.011 -0.003 0.006 -0.001 0.055 29 06/06/2012 -0.001 0.020 -0.046 0.042 0.016 0.017 -0.012 0.033 0.003 0.018 -0.071 0.167 29 07/24/2012 0.002 0.009 -0.018 0.023 0.001 0.010 -0.014 0.018 0.010 0.010 0.049 0.082 29 11/30/2012 -0.003 0.010 0.005 0.024 0.016 0.012 0.006 0.018 0.003 0.010 0.053 0.086 38 03/30/2012 0.014 0.020 -0.006 0.048 -0.002 0.022 0.009 0.034 0.006 0.022 -0.083 0.168 38 06/08/2012 0.000 0.022 -0.051 0.037 0.006 0.020 0.014 0.034 -0.009 0.022 -0.105 0.189 38 09/27/2012 -0.002 0.017 0.013 0.045 0.015 0.022 -0.012 0.038 -0.002 0.022 0.094 0.172 38 12/20/2012 0.003 0.009 0.013 0.021 0.004 0.011 0.006 0.018 0.007 0.012 -0.059 0.080 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-134 Cs-1 37 Ac-228

(+/-) (+/-)

29 03/14/2012 -0.001 0.006 -0.001 0.016 0.005 0.010 -0.002 0.007 0.001 0.006 -0.013 0.028 29 06/06/2012 0.000 0.017 -0.009 0.043 0.018 0.036 0.015 0.021 -0.003 0.019 0.007 0.065 29 07/24/2012 0.000 0.009 -0.017 0.024 0.025 0.028 -0.001 0.010 0.008 0.010 -0.007 0.040 29 11/30/2012 -0.003 0.009 -0.011 0.027 -0.021 0.025 0.004 0.010 0.004 0.010 0.002 0.046 38 03/30/2012 -0.001 0.016 0.033 0.055 0.016 0.060 0.004 0.022 0.000 0.020 0.020 0.085 38 06/08/2012 -0.010 0.019 -0.003 0.052 0.005 0.058 -0.006 0.023 0.010 0.020 -0.039 0.071 38 09/2712012 0.003 0.019 -0.032 0.048 0.052 0.057 -0.012 0.024 0.007 0.020 0.037 0.074 38 12/20/2012 -0.001 0.009 -0.012 0.024 0.049 0.054 0.003 0.011 0.010 0.009 0.044 0.058 3-47

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 21 SCALLOPS Scallops were not sampled in 2012. See discussion in Section 4.21.

3-48

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE 22 LOBSTERS (pCi/g wet wt.)

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

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

32 03/30/2012 -0.064 0.168 2.056 0.641 -0.032 0.193 -0.012 0.016 -0.003 0.015 0.017 0.036 32 05/07/2012 -0.015 0.065 2.796 0.237 -0.009 0.074 0.005 0.008 -0.006 0.009 -0.001 0.016 32 08/13/2012 0.083 0.181 2.586 0.618 -0.022 0.204 0.006 0.020 0.000 0.021 0.010 0.041 32 10/26/2012 0.049 0.199 2.646 0.586 -0.043 0.214 0.004 0.021 0.002 0.023 0.009 0.047 35 03/30/2012 -0.072 0.165 3.314 0.516 -0.086 0.182 -0.003 0.016 0.004 0.017 -0.026 0.040 35 05/07/2012 0.009 0.077 2.854 0.243 -0.060 0.084 -0.003 0.009 0.003 0.009 -0.014 0.017 35 08/13/2012 0.095 0.177 2.870 0.553 0.001 0.205 -0.007 0.020 -0.009 0.022 0.010 0.040 35 10/26/2012 0.049 0.118 3.330 0.375 0.056 0.136 -0.003 0.013 -0.010 0.014 -0.010 0.031 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

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

32 03/30/2012 0.008 0.019 0.022 0.045 0.005 0.022 -0.015 0.030 0.001 0.023 0.058 0.164 32 05/07/2012 -0.003 0.008 0.010 0.019 0.013 0.009 0.000 0.013 0.003 0.008 -0.005 0.071 32 08/13/2012 0.013 0.022 -0.039 0.051 0.004 0.021 -0.018 0.036 -0.003 0.023 0.108 0.211 32 10/2612012 0.003 0.023 -0.054 0.047 0.031 0.021 0.015 0.038 -0.018 0.024 -0.153 0.192 35 03/30/2012 -0.001 0.019 -0.069 0.041 0.006 0.020 -0.022 0.032 -0.013 0.021 -0.068 0.176 35 05/07/2012 -0.001 0.009 -0.008 0.021 0.003 0.010 0.001 0.016 -0.006 0.010 0.119 0.082 35 08/13/2012 -0.002 0.022 0.010 0.052 0.041 0.023 -0.010 0.037 -0.013 0.022 0.209 0.198 35 10/26/2012 -0.003 0.016 -0.038 0.032 0.009 0.014 0.029 0.025 -0.003 0.015 0.086 0.122 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-134 Cs-137 Ac-228

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

32 03/30/2012 0.017 0.016 0.032 0.050 -0.030 0.064 0.000 0.018 0.001 0.020 0.125 0.088 32 05/07/2012 -0.005 0.007 -0.003 0.021 0.017 0.017 -0.006 0.009 -0.002 0.008 -0.013 0.034 32 08/13/2012 -0.014 0.022 0.007 0.060 -0.020 0.041 -0.015 0.024 0.004 0.025 -0.003 0.086 32 10/26/2012 0.009 0.019 0.002 0.058 -0.023 0.057 -0.073 0.026 -0.008 0.021 -0.060 0.096 35 03/30/2012 -0.001 0.016 -0.012 0.045 0.025 0.054 -0.014 0.023 0.007 0.017 -0.031 0.062 35 05/07/2012 0.001 0.008 0.013 0.023 -0.010 0.018 0.003 0.010 -0.007 0.009 0.008 0.039 35 08/13/2012 0.012 0.019 -0.027 0.052 -0.009 0.040 -0.013 0.026 -0.015 0.023 -0.032 0.086 35 10/26/2012 0.004 0.012 0.004 0.037 -0.004 0.035 -0.019 0.017 0.000 0.013 -0.014 0.059 3-49

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012

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 plant related radionuclides.

Cs-1 37 and Sr-90 were observed at levels similar to those of past years. The levels of Cs-137 and Sr-90 detected were the result of atmospheric nuclear weapons testing in the 1960's.

Some REMP samples during 2012 identified detectable concentrations of isotopes that could be credibly attributed to the trans-Pacific transport of airborne releases from Fukushima, Japan following the March 11, 2012 Tohoku earthquake.

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 CaSO 4(Tm) Panasonic model UD-804 ASx TLDs.

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 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 in 2012. The exposure rate measurements at 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 73X, 7.4 uR/hour at location 74X and 6.7 uR/hour at location 75X). 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.

4-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 on-site and off-site locations and include gamma exposure from all sources of radioactivity. For example, the Weather Shack (location 02), MPS3 Discharge (location 05), Environmental Laboratory (location 08), Bay Point Beach (location 09), 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 Fisher's Island, Norwich and Old Lyme (locations 12C, 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 average of all indicator locations for the period when MPS1 was still in operation (through 1995) exhibit the effects of N-16 BWR turbine building sky-shine to immediate areas onsite. As discussed in previous annual reports, the effects of sky-shine at onsite monitoring stations were increased exposure rates as high as 6 Ur/hr at certain onsite locations. The elevated exposure rates from sky-shine 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 2012 data for location 3 shows an increase likely attributable to the being closer to granite at the new location.

Although not measurable, any resulting site boundary doses are bounded by dose rates from the radwaste storage areas and are discussed in Section 5.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Figur'e 4.1-1 uR4r Annual Ganaka Exposre RM e- 20 Year Hbltoy :AI ,Cotrolrs mlidicator Loc I aldicator Loc 3 I

kkh lli.. ElI - -

I I I I I I I f I I I 1111 T1 II

-~P -j P~~hIhIi 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 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.

Rigme 4.2-1 Air Perticulate Gross Beta Activity I I dcators pCo4 Monthly Averages. 2012 ContolI

.AU L016 1.015 1.014 1.A12 1.010 DAMK Jan Peb Ma Apr MW Jun Jl Aug sop Oct Nov Doe 4-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 4.3 Airborne Iodine (Table 3)

Charcoal cartridges are included at all of the air particulate monitoring stations for the collection of atmospheric iodine. These cartridges are analyzed on a weekly basis for 1-131.

No detectable levels of 1-131 were seen in the 2012 charcoal samples.

4.4 Air Particulate Gamma (Table 4)

The air particulate samples that are utilized for the weekly 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 plant related.

4-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 4.6 Soil (Table 6)

MPS resumed collection of soil as a required media type in 2001. Prior to 2001, it had not been sampled for over fifteen years. These samples were discontinued due to the fact that, previous sample results never indicated any station related detectable activity. Similarly, since 2001, no station detectable activity has been seen in these samples. 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. Baseline levels should be useful in the future, when site characterization and decommissioning of the station become the focus during preparations for License termination. This media is collected annually from one control and two indicator locations.

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 MPS to be considered an indicator location (i.e. within 10 miles) have ceased operation. Two cow milk locations about ten and half miles from the plant were sampled as extra (i.e.; not required) samples and results are shown in Table 7. Location 18 ceased milking of cows in July and was replaced by Location 22.

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 2012 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 2012, 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. These samples may also be taken to further investigate the levels of radioactivity in milk. No station effects are noted in these samples.

Cosmic produced Be-7 was observed in the majority of the samples. Naturally occurring K-40 was approximately two times higher in hay and feed compared to pasture grass samples.

4-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 4.10 Well Water (Table 10)

There were no incidents of any station related activity detected in the samples collected as part of the REMP. Other onsite wells were sampled. Those results are reported in the Millstone annual "Radioactive Effluent Release Report" for 2012.

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.

4.12 Fruits and Vegetables (Table 12)

Consistent with past years, this media did not show any station effects. Naturally occurring Be-7 was detected in some samples and K-40 in all samples.

4.13 Broad Leaf Vegetation (Table 13)

Consistent with past years, this media did not show any station effects. All 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. This can be attributed to fallout from weapons testing which has been widespread in terrestrial samples for many years.

This media can be an early and sensitive indicator of releases from the station for both unplanned releases and normal operations. Therefore, to enhance program-monitoring effectiveness, samples of broadleaf vegetation are collected monthly during the growing season, May - October, even though requirements are to collect this media twice a year.

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 MPS 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. Although samples obtained at this location actually monitor the undiluted discharge activity, it provides for an excellent check on the radioactive effluent monitoring program. 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 MPS.

4-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 A technician collects an aliquot from the automatic sampler at Location 32 on a weekly frequency. These samples are composited for monthly analyses. In September 1999, MPS increased the required analysis frequency for this composite sample to monthly to increase monitoring effectiveness. For the Control Location, Giant's Neck (Location 37C), six weekly grab samples are obtained for quarterly compositing. In 2003, the LLD for H-3 (tritium) at the indicator location (32) was lowered by approximately a factor of four to further enhance monitoring effectiveness. This lower LLD was continued through 2012.

Naturally occurring K-40 was the only detectable gamma activity seen in most of these samples and naturally occurring Ac-228 was seen in one sample. Results for Fe-59 and Sb-125 on July 31, for Mn-54 on June 12, for 1-131 on Aug. 14 and for Nb-95 on Nov. 13, although greater than the 2o error, were less than their MDC. Measured plant related levels of H-3 inseawater from the immediate vicinity of discharge (location 32) were observed in most samples. MPS2 in October had a refueling outage. Tritium releases are typically higher near these 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 plant 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 MPS liquid effluents versus the measured environmental concentrations from the vicinity of discharge location.

lgre 4.14-1 H-3 Caries Reeused versus Sewater Concentratfon 18 Year Trend 1700 Sow Curies discharged T low 140- REMP pCi/liter 1100.

No R

=

100 0SO W l! 6 M ll Q lieITl1l1i 4-7

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 4.15 Bottom Sediment (Table 15)

There was no plant related radioactivity detected in bottom sediment samples in 2012.

Naturally occurring K-40 is seen in all samples Some results are greater than their 2o error but all are less than the MDC.

Bottom sediment is not a significant dose pathway to man, especially at areas not typically used by the public. Examinations of other aquatic media, including seafood, sampled from near these locations (discussions that follow) do not show any detectable Co-60 or Cs-1 37.

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-110m) have been detected in the past.

Since 2000, levels have decreased to undetectable for all nuclides except for 1-131. Some results are greater than their 2a error but less than the MDC.

Seaweed has a significant bioaccumulation factor for iodine which makes it an extremely sensitive indicator of iodine in the environment. Three positive, plant-related 1-131 measurements were noted in 2012, one on July 26 at Location #32 which is Vicinity of Discharge, one on March 14 at Location #29 which is in Jordon Cove just downstream of discharge and one on August 21 at Location #35 which is Niantic Bay adjacent to the plant.

The measurements are consistent with 1-131 seen in liquid effluents reported for the first three quarters of 2012. Positive 1-131 results were also seen at background location #90 on August 21 and October 24. This location is downstream of the waste water processing plant on the Thames River in New London. In the past 1-131 at this location was determined to be from medical waste being processed. The positive result seen on August 21 in Niantic Bay (Location #35) my be from this same source. Release of 1-131 in liquid effluents were well below regulatory limits and environment concentrations are comparable to some prior years at the same locations.

4.17 Fish (Tables 17A and 17B) 4.17.1 Flounder (Table 17A)

The activity in Flounder is the same as that seen for the past decade. No activity was observed except for the naturally occurring K-40. Nb-95 calculated activity was greater than the calculated MDC for the sample on May 25 at Location #32. But further analysis of the gamma spectrum determined that the peak was not from actual radioactivity. Several other results are greater than their 2a error but less than the MDC.

4.17.2 Fish - Other (Table 17B)

The activity in other fish is the same as that seen for the past decade. No activity was observed in this media except for naturally occurring K-40. One result (Nb-95 on May 7 at Location #29) was greater than its 2a error but less than the MDC.

4.18 Mussels (Table 18)

Similar to the last several years, this sampling media showed no activity except for the naturally occurring Be-7 and K-40. Several other results are greater than their 2o error but less than the MDC. Mussels were not available at the required sampling location of Two Three Island (#28). They were replaced by samples taken from Niantic Bay.

4-8

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 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 about six 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.

MPS related Ag-110m was detected in two samples (June 28 and December 12) from Location #32. This has been an historical occurrence (see discussion below). Nb-95 calculated activity was greater than the calculated MDC for the same samples, but further analyses of the gamma spectrums determined that the peaks were not from actual radioactivity.

For several previous years, high levels of Zn-65 were observed in oysters. This was caused by their high capacity for accumulating 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 MPS1 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-110m concentration in quarry oysters compared to the liquid effluents discharged. Similar to Zn-65, the correlation between Ag-110m discharged and the Ag-110m concentration measured in the native quarry oysters is apparent. Per regulatory guidance (Reference 7), the bioaccumulation factors for both Zn and Ag were adjusted based upon several years of historical data to account for the higher measured uptakes. These adjustments have typically shown good agreement between the two methods, with method 1 usually being conservative. Due to significant effluent reductions over the last several years, the low resulting doses (less than 0.01 mrem) make this comparison difficult and subject to significant error. Trending of these comparisons is routinely performed and adjustments are made, if appropriate.

The location of the quarry is on-site and not available for public use. No MPS activity was observed at locations beyond the MPS discharge area. Therefore, the actual concentration of the nuclides in oysters available for public consumption is much less than the levels found inside the quarry. The near-field dilution factor for liquid discharges from the Millstone Quarry discharge is a factor of 3.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Figure 4.19-1 Zn-65 COMPARISON Curies Discharged vs. Native Oyster Concentration pCi/gram Curies 0.1 100

- -Curies Discharged

-- Oyster conc.

0.01 -- 10 0.001 -4 1 0.0001 - - 0.1 0.00001 0.01 0.000001 0.001 a a a a a a 0a o 0 ut a0 a0 a 0

a0 a0 a 0

a0 a0 Quarter Figure 4.19-2 Ag.410m COMPARISON Cwles Curies Discharged vs. Native* Oyster Concentraton pCIlpun 0.1 100 0.01 -U- Oyster Con c.

T ' L 0CAM1 0.11 I. 0 0 ---. -- o01--

omrtr

Native oysters until 3Q 2007; because of diver safety issues oysters are only sampled now in the Quarry stocked in trays similar to what has historically been performed at all the other locations.

4-10

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 4.20 Clams (Table 20)

Occasionally this media indicates the presence of station related radioactivity. No activity was observed except for the naturally occurring K-40. Some results are greater than their 20 error but all are less than the MDC.

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. Some results are greater than their 2o error but all are less than the MDC.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012

5. DISCUSSION The evaluation of the effects of MPS operation on the environment requires the careful consideration of many factors. Those factors depend upon the media being affected. They include MPS release rates, effluent dispersion, occurrence of nuclear weapons tests, seasonal variability of fallout, local environment, and location variability of fallout. Additional factors affecting the uptake of radionuclides in milk include soil conditions (mineral content, pH, etc.), quality of fertilization, quality of land management (e.g., irrigation), pasturing habits of animals, and type of pasturage. Any of these factors could cause significant variations in the measured radioactivity. A failure to consider these factors could cause erroneous conclusions.

Consider, for example, the problem of deciphering the effect of MPS releases on the radioactivity measured in milk samples. Some of these fission products, such as 1-131 and Sr-89 are relatively short-lived. Therefore they can result from MPS effluents, nuclear weapons tests or nuclear incidents (e.g. Chernobyl, Fukushima). Sr-89's lifetime is longer than 1-131's, therefore it will remain around for much longer periods of time. The even longer-lived fission products, Sr-90 and Cs-137, cause more of a concern. These isotopes are still remaining from the weapons testing era of the 1960's. This results in measurable amounts of Sr-90 and Cs-137 appearing in past milk samples. Distinguishing between this "background" of fallout activity and MPS effects is of prime interest for a REMP.

In reviewing the historical Sr-90 and Cs-137 measured in cow and goat milk in the areas around MPS, a casual observer could notice that in some cases the levels of these isotopes are higher at farms closer to the MPS than at those further away from the MPS. The MPS's effluents might at first appear to be responsible. However, the investigation of the following facts proves this conclusion wrong.

(1) Nuclear power stations measure many fission products, including Sr-90 and Cs-137 in their releases. Based on these measurements and proven models developed by the NRC, concentrations in the environment can be calculated. These calculations show that insufficient quantities of Sr-90 and Cs-137 have been released from the plants to yield the measured concentrations in milk.

(2) Over the many years of MPS operation, Sr-89 has often been released in comparable quantity to Sr-90. Since they are chemically similar, comparable levels should have been detected in milk if the Sr-90 was MPS related. No MPS related Sr-89 has ever been detected in milk samples.

(3) Similar to Sr-89, Cs-1 34 can be used as an indication of MPS related Cs-137. Although not as conclusive as Sr-89, the lack of any measurable Cs-1 34 in any of the milk samples suggests that the Cs-1 37 is not MPS related. This is further confirmed by the evaluation of the air particulate data. The only occurrences of detectable Cs-134 in milk resulted from the Chernobyl incident.

(4) Dairy milk sampling in Connecticut began in the 1960's, several years prior to MPS operation. The highest levels of weapons fallout related Sr-90 and Cs-137 (see Figures 6-1 and 6-2), were measured in the years prior to MPS operation. Samples taken in the immediate areas have always shown higher levels of weapons related fallout than samples taken from the Central Connecticut Region (CT Pooled Milk). Radioactivity levels of fallout related Sr-90 and Cs-137 have decreased significantly since the 1964 Nuclear Test Ban Treaty due to decay.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 (5) Local variability of Sr-90 and Cs-137 in milk is common throughout the United States.

Due to the variability in soil conditions, pasturing methods, rainfall, etc., it is the rule rather than the exception. Therefore, it is not surprising that certain farms have higher levels of radioactivity than other farms. In fact, in the past there are some cases where the farms further from the MPS have higher Sr-90 and Cs-137 values than the farms that are closer to the MPS.

(6) In the past when a goat farm operated near MPS (2.0 Mi - ENE), the highest levels of Sr-90 and Cs-137 were typically indicated. This same farm also experienced the highest levels of short-lived activity from the 1976 and 1977 Chinese Tests and the 1986 Chernobyl accident. This indicates that for some unknown reason this farm had the ability for higher reconcentration. Special studies performed at this and other farms failed to find any link to the MPS.

Based on these facts, the observation that the MPS effluents are responsible is evidently false. The cause must be one or more of the other variables.

Dominion has carefully examined the data throughout the years and has presented in this report all cases where MPS related radioactivity could be detected. An analysis of the potential exposure to the maximum individual from any MPS related activity has been performed and shows that in all cases the exposure is insignificant.

The Connecticut Department of Energy and Environmental Protection (DEEP) performs an independent check on certain environmental program analyses. The results of their analyses are comparable to the results from this program's analyses. These comparisons can be used as a cross-reference to verify measured MPS activity. DEEP performed a comprehensive review of all the historical MPS data in 2006 (Reference 17). It concluded that "the collective sampling in and around Millstone Power Station show expected levels of residual fallout from weapons testing and the Chernobyl event and are unrelated to the operation of the Millstone Power Station."

Figure 4-1 Strontium-90 in Milk pCi/liter 25

CT Pooled 20 - Haddam ar 15- MPS area I 15 10 5-0 [.. .. . . .

61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 Year 5-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 Figure 4-2 Cesium-137 in Milk pCi/liter 160 140 CT Pooled Milk 120 --- Haddam area Milk 100 ---- MPS area Milk 80 60 40 20 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 Year Dairy milk is no longer available within ten miles of MIPS, Haddam Neck no longer collects milk, and CT Pooled milk has not been collected by the State of CT since 1994. Graphs provided to show historical trends.

CY Start-up occurred: July 24,1967 MPS2 Start-up occurred: December, 1975 MPS1 Start-up occurred: October 26,1970 MPS3 Start-up occurred: January 23, 1986 5-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012

6. 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 Population of 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, 2012.

9) United States of America, Code of Federal Regulations, Title 10, Part 20.1301.

10) United States of America, Code of Federal Regulations, Title 10, Part 50, Appendix I.

11) United States of America, Code of Federal Regulations, Title 40, Part 190.

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

13) ICN/TracerLab, "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-1301, "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," Revision 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.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Enviromnental Operating Report Millstone Power Station 2012 APPENDIX A LAND USE CENSUS FOR 2012 A-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 INTRODUCTION The annual land use census in the vicinity of MPS was conducted as required by the MPS 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 2012 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. Goat locations are more difficult to determine, but best efforts are made to consult goat association records, contact previous owners and or drive-bys, if necessary.

RESULTS Tables A-1 through A-3 indicate information from the latest land use census. No new dairy animals within 10 miles of the MPS were located during the census. Several changes were identified, these include:

Thirteen cow dairy locations were removed from the previous year census.

" One new cow dairy location was added.

" One goat location, Indicator Location #22, was removed from the previous year census.

" Nine new goat locations were added.

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

Based on these changes a cow sampling location was changed and there was loss of one goat location. The cow location at 10.4 miles NW from last year's census was lost and sampling at cow location 10.5 miles WNW was begun in middle of 2012.

Based on these changes the goat location at 2.8 miles NE from last year's census was lost.

A goat location which is actively milking could not be found to replace that location. Two locations remain in the sample schedule, Location #21 at 2.1 miles N is the indicator and Location #24 is the control (background). Neither one of these locations were actively milking during 2012.

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

A-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE A-1 Active Dairy Cows Within 20 Miles of Millstone Point - 2012 Direction Distance Location miles meters N 18.0 29,000 Bozrah N 18.5 29,800 North Franklin N 19.4 31,200 North Franklin N 19.6 31,500 North Franklin NNE 15.0 24,100 Preston NNE 16.2 26,100 Preston NNE 16.3 26,200 Norwich NE 14.4 23,200 North Stonington NE 19.1 30,700 Preston*

NE 19.2 30,900 North Stonington NE 19.2 30,900 North Stonington ENE 17.9 28,800 North Stonington WNW 10.5 16,900 Lyme **

NNW 19.5 31,400 Lebanon NNW 19.6 31,500 Lebanon

New location for this year

- Began sampling on Aug. 22, 2012 Note: None of these cow farms are required to be sampled since all farms are greater than ten miles from plant (NUREG 1301, Reference 15, uses a cutoff distance of 5 miles). The closest milk farm at 10.5 miles is sampled as an extra sample.

A-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE A-2 Dairy Goats* Within 20 Miles** of Millstone Point - 2012 Direction Distance Location miles meters N 2.1 3,350 Waterford (Location 21)

N 11.1 17,900 Oakdale N 17.3 27,800 Lebanon***

N 18.4 29,600 Bozrah***

N 18.5 29,800 North Franklin***

NNE 17.4 28,000 Preston***

NNE 18.3 29,500 Preston***

ENE 11.8 19,000 Stonington ENE 12.8 20,600 Stonington ENE 17.9 28,800 North Stonington*

WNW 9.5 15,300 Lyme***

WNW 14.6 23,500 Hadlyme***

WNW 17.6 28,300 Haddam NW 16.9 27,200 East Haddam NNW 12.2 19,600 Salem NNW 18.1 29,100 Colchester NNW 19.5 31,400 Lebanon***

NNW 28.6 46,000 Hebron (Location 24)

Some goat locations are not actively milking, including the present indicator locations (#21 at 2.1 miles N).

- Plus one control location at 28.6 miles New location A-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 TABLE A-3 2012 Resident and Garden Survey Closest Distance For:

Downwind Resident Garden Direction miles meters miles meters N 1.1 1,750 1.1 1,750 NNE 0.59 942 0.59 942 NE 0.54 864 0.54 864 ENE 1.1 1,720 1.1 1,720 E 1.0 1,620 1.0 1,620 ESE 1.2 1,860 1.2 1,860 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 2.3 3,670 2.3 3,670 WSW 2.0 3,230 2.0 3,230 W 1.8 2,940 1.8 2,940 WNW 1.6 2,610 1.6 2,810 NW 1.5 2,360 1.5 2,360 NNW 0.65 1,050 0.65 1,050 N/A - not applicable (over water sectors)

A-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 APPENDIX B

SUMMARY

OF INTERLABORATORY COMPARISONS

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 INTRODUCTION This appendix covers the Intercomparison Program of the Teledyne Brown Engineering Laboratory as required by technical specifications for each MPS unit. Teledyne uses QA/QC 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 (9 nuclides) once per quarter

" water for low level Iodine-1 31 analyses twice per year

" water for tritium analyses once per quarter

" water for Sr-90 analyses once per quarter

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 (10 nuclides) analyses twice per year

vegetation for gamma (6 nuclides) analyses twice per year

vegetation for Sr-90 analyses twice per year RESULTS 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. Teledyne Brown Engineering Intercomparison Program results are included on pages B-3 through B-6 for 2012.

A total of 180 analysis results were obtained by Teledyne Brown Engineering with 173 within acceptable criteria, a 96% success rate. Results of investigations are noted at the end of the following tables.

B-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING ENVIRONMENTAL SERVICES Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)

March 2012 E10066 Milk Sr-89 pCi/L 101 94.8 1.07 Sr-90 pCi/L 11.7 13.5 0.87 E10067 Milk 1-131 pCi/L 87.5 92.5 0.95 Ce-141 pCi/L 247 260 0.95 Cr-51 pCi/L 435 436 1.00 Cs-134 pCi/L 133 149 0.89 Cs-137 pCi/L 156 159 0.98 Co-58 pCi/L 127 132 0.96 Mn-54 pCi/L 190 195 0.97 Fe-59 pCi/L 179 168 1.07 Zn-65 pCi/L 327 333 0.98 Co-60 pCi/L 274 279 0.98 E10069 AP Ce-141 pCi 167 164 1.02 Cr-51 pCi 310 276 1.12 Cs-134 pCi 107 94.5 1.13 Cs-137 pCi 109 101 1.08 Co-58 pCi 87.6 83.5 1.05 Mn-54 pCi 133 123 1.08 Fe-59 pCi 113 106 1.07 Zn-65 pCi 226 210 1.08 Co-60 pCi 185 176 1.05 E10068 Charcoal 1-131 pCi 92.8 94.2 0.99 E10070 Water Fe-55 pCi/L 1800 1570 1.15 June 2012 E10198 Milk Sr-89 pCi/L 86.1 99.8 0.86 A Sr-90 pCi/L 9.2 12.7 0.72 W E10199 Milk 1-131 pCi/L 88.9 99.7 0.89 A Ce-141 pCi/L 72.8 82.2 0.89 A Cr-51 pCi/L 394 402 0.98 A Cs-134 pCi/L 159 174 0.91 A Cs-137 pCi/L 206 212 0.97 A Co-58 pCi/L 89.5 92.3 0.97 A Mn-54 pCi/L 129 132 0.98 A Fe-59 pCi/L 129 128 1.01 A Zn-65 pCi/L 193 199 0.97 A Co-60 pCi/L 342 355 0.96 A E10201 AP Ce-141 pCi 73.2 75.1 0.97 A Cr-51 pCi 367 366 1.00 A Cs-134 pCi 165 159 1.04 A Cs-137 pCi 205 193 1.06 A Co-58 pCi 84.7 84.2 1.01 A Mn-54 pCi 118 121 0.98 A Fe-59 pCi 125 117 1.07 A Zn-65 pCi 181 182 0.99 A Co-60 pCi 338 324 1.04 A E10200 Charcoal 1-131 pCi 101 96.6 1.05 A (a) Teledyne Brown Engineering reportedresult.

(b) The Analytics known value is equal to 100% of the parameterpresent in the standardas determined by gravimetric and/or volumetric measurements made during standardpreparation.

(c) Ratio of Teledyne Brown Engineeringto Analytics results.

(d) Analytics evaluationbased on TBE internal QC limits: A= Acceptable. Reported result falls within ratio limits of 0.80-1.20.

W-Acceptable with waming. Reported result falls within 0. 70-0.80 or 1.20-1.30. N = Not Acceptable. Reported result falls outside the ratio limits of < 0.70 and > 1.30.

B-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING ENVIRONMENTAL SERVICES Identification Reported Known Ratio (c)

Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/Analytics Evaluation (d)

June 2012 E10202 Water Fe-55 pCi/L 1890 1580 1.20 A September 2012 E10296 Milk Sr-89 pCi/L 106 99.6 1.06 A Sr-90 pCi/L 13.6 16.0 0.85 A E10297 Milk 1-131 pCi/L 89.8 99.6 0.90 A Ce-141 pCi/L 160 164 0.98 A Cr-51 pCi/L 230 248 0.93 A Cs-134 pCi/L 101 108 0.94 A Cs-137 pCi/L 174 174 1.00 A Co-58 pCi/L 97.2 100 0.97 A Mn-54 pCi/L 188 196 0.96 A Fe-59 pCi/L 159 152 1.05 A Zn-65 pCi/L 195 192 1.02 A Co-60 pCi/L 155 152 1.02 A E10299 AP Ce-141 pCi 145 135 1.07 A Cr-51 pCi 219 205 1.07 A Cs-134 pCi 94.1 89.4 1.05 A Cs-137 pCi 140 144 0.97 A Co-58 pCi 88.3 83.0 1.06 A Mn-54 pCi 173 162 1.07 A Fe-59 pCi 136 125 1.09 A Zn-65 pCi 165 159 1.04 A Co-60 pCi 133 125 1.06 A E10298 Charcoal 1-131 pCi 95.5 97.2 0.98 A E10300 Water Fe-55 pCi/L 1630 1900 0.86 A December 2012 E10334 Milk Sr-89 pCi/L 101 96.6 1.05 Sr-90 pCi/L 11.3 13.8 0.82 E10335 Milk 1-131 pCi/L 93.1 90.0 1.03 Ce-141 pCi/L 52.5 51.0 1.03 Cr-51 pCi/L 373 348 1.07 Cs-134 pCi/L 157 165 0.95 Cs-137 pCi/L 113 117 0.97 Co-58 pCi/L 94.1 98.5 0.96 Mn-54 pCi/L 116 116 1.00 Fe-59 pCi/L 124 116 1.07 Zn-65 pCi/L 190 186 1.02 Co-60 pCi/L 172 170 1.01 E10337A AP Ce-141 pCi 51.8 49.6 1.04 Cr-51 pCi 372 338 1.10 Cs-134 pCi 165 161 1.02 Cs-137 pCi 113 114 0.99 Co-58 pCi 96.5 95.8 1.01 Mn-54 pCi 118 112 1.05 Fe-59 pCi 105 112 0.94 Zn-65 pCi 166 181 0.92 Co-60 pCi 179 165 1.08 December2012 E10336 Charcoal 1-131 pCi 73.1 72.7 1.01 E10333 Water Fe-55 pCi/L 1550 1750 0.89 (a) Teledyne Brown Engineering reportedresult.

(b) The Analytics known value is equal to 100% of the parameterpresent in the standardas determined by gravimetric and/or volumetricmeasurements made during standardpreparation.

(c) Ratio of Teledyne Brown Engineering to Analytics results.

(d) Analytics evaluation based on TBE internal QC limits: A= Acceptable. Reported result falls within ratio limits of 0.80-1.20.

W-Acceptable with waming. Reported result falls within 0.70-0. 80 or 1.20-1.30. N = Not Acceptable. Reported result falls outside the ratio limits of < 0. 70 and > 1.30.

B-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 DOE's MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING ENVIRONMENTAL SERVICES Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c)

March 2012 12-MaW26 Water Cs-134 Bq/L -0.0045 (1) A Cs-137 Bq/L 37.5 39.9 27.9-51.9 A Co-57 Bq/L 30.8 32.9 23.0 - 42.8 A Co-60 Bq/L 22.4 23.72 16.60 - 30.84 A H-3 Bq/L 456 437 306 - 568 A Mn-54 Bq/L 31.0 31.8 22.3-41.3 A K-40 Bq/L 144 142 99-185 A Sr-90 Bq/L -0.0084 (1) A Zn-65 Bq/L -0.369 (1) A 12-GrW26 Water Gr-A Bq/L 2.06 2.14 0.64-3.64 A Gr-B Bq/L 7.48 6.36 3.18 - 9.54 A 12-MaS26 Soil Cs-134 Bq/kg 831 828 580- 1076 A Cs-137 Bq/kg 0.145 (1) A Co-57 Bq/kg 1270 1179 825-1533 A Co-60 Bq/kg 7.61 1.56 (2) N (3)

Mn-54 Bq/kg 634 558 391 - 725 A K-40 Bq/kg 1690 1491 1044-1938 A Sr-90 Bq/kg 328 392 274 - 540 A Zn-65 Bq/kg 753 642 449 - 835 A 12-RdF26 AP Cs-134 Bq/sample 2.31 2.38 1.67-3.09 A Cs-137 Bq/sample 2.15 1.79 1.25-2.33 W Co-57 Bq/sample -0.0701 (1) A Co-60 Bq/sample 2.62 2.182 1.527 - 2.837 W Mn-54 Bq/sample 4.13 3.24 2.27-4.21 W Sr-90 Bq/sample 0.0185 (1) A Zn-65 Bq/sample 4.19 2.99 2.09 - 3.89 N (3) 12-GrF26 AP Gr-A Bq/sample 0.365 1.2 0.4-2.0 A Gr-B Bq/sample 2.31 2.4 1.2- 3.6 A 12-RdV26 Vegetation Cs-134 Bq/sample 8.72 8.43 5.90- 10.96 A Cs-137 Bq/sample 0.0424 (1) A Co-57 Bq/sample 15.5 12.0 8.4-15.6 W Co-60 Bq/sample 6.80 6.05 4.24 -7.87 A Mn-54 Bq/sample 0.0057 (1) A Sr-90 Bq/sample 2.24 2.11 1.48-2.74 A Zn-65 Bq/sample 10.5 8.90 6.23- 11.57 A September 2012 12-MaW27 Water Cs-134 Bq/L 21.4 23.2 16.2-30.2 A Cs-137 Bq/L 17.0 16.7 11.7-21.7 A Co-57 Bq/L 28.7 29.3 20.5 - 38.1 A Co-60 Bq/L 0.179 (1) A H-3 Bq/L 387 334 234-434 A Mn-54 Bq/L 18.1 17.8 12.5-23.1 A K-40 Bq/L 139 134 94-174 A Sr-90 Bq/L 19.6 12.2 8.5- 15.9 N (4)

Zn-65 Bq/L 27.2 25.9 18.1 - 33.7 A 12-GrW27 Water Gr-A Bq/L 0.966 1.79 0.54- 3.04 A Gr-B Bq/L 10.0 9.1 4.6-13.7 A (1) Falsepositive test.

(2) Sensitivity evaluation (3) No cause was found for the failedhigh soil Co-60 sensitivity test or the high Zn-65 in AP, which TBE considers an anomaly. NCR 12-08 (4) Sr-90 in water high due to incorrect aliquot entered in LIMS. 12-11 (a) Teledyne Brown Engineenngreported result.

(b) The MAPEP known value is equal to 100% of the parameterpresent in the standardas determined by gravimetnc and/or volumetric measurements made durng standardpreparation.

(c) DOEIMAPEP evaluation: A=acceptable, W=acceptable with waming, N=not acceptable.

B-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 DOE's MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING ENVIRONMENTAL SERVICES Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c)

September 2012 12-MaS27 Soil Cs-134 Bq/kg 880 939 657- 1221 A Cs-137 Bq/kg 1220 1150 805- 1495 A Co-57 Bq/kg 1330 1316 921-1711 A Co-60 Bq/kg 552 531 372 - 690 A Mn-54 Bq/kg 1000 920 644 - 1196 A K-40 Bq/kg 674 632 442 - 822 A Sr-90 Bq/kg 528 508 356 - 660 A Zn-65 Bq/kg 665 606 424 - 788 A 12-RdF27 AP Cs-134 Bq/sample 2.760 2.74 1.92 -3.56 A Cs-1 37 Bq/sample 0.0415 (1) A Co-57 Bq/sample 2.00 191.00 1.34 -2.48 A Co-60 Bq/sample 1.78 1.728 1.210 - 2.246 A Mn-54 Bq/sample 2.40 2.36 1.65 - 3.07 A Sr-90 Bq/sample 0.931 1.03 0.72-1.34 A Zn-65 Bq/sample -0.688 (1) A 12-GrF27 AP Gr-A Bq/sample 0.434 0.97 0.29 - 1.65 A Gr-B Bq/sample 1.927 1.92 0.96 - 2.88 A 12-RdV27 Vegetation Cs-134 Bq/sample 6.28 6.51 4.56 - 8.46 A Cs-137 Bq/sample 4.62 4.38 3.07 - 5.69 A Co-57 Bq/sample 6.51 5.66 3.96 - 7.36 A Co-60 Bq/sample 5.32 5.12 3.58 - 6.66 A Mn-54 Bq/sample 3.59 3.27 2.29 -4.25 A Sr-90 Bq/sample 0.0012 (1) A Zn-65 Bq/sample -0.046 (1) A (1) Falsepositive test.

(a) Teledyne Brown Engineering reportedresult.

(b) The MAPEP known value is equal to 100% of the parameterpresent in the standardas determined by gravimetricand/or volumetric measurements made during standardpreparation.

(c) DOE/MAPEP evaluation:A=acceptable, W=acceptable with warning, N=not acceptable.

B-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2012 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING ENVIRONMENTAL SERVICES Identification Reported Known Acceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Limits Evaluation (c)

May 2012 RAD-89 Water Sr-89 pCi/L 63.4 58.5 46.9 - 66.3 A Sr-90 pCi/L 33.5 37.4 27.4 -43.1 A Ba-1i33 pCi/L 89.2 82.3 69.1 -90.5 A Cs-134 pCi/L 66.5 74.2 60.6 - 81.6 A Cs-1 37 pCi/L 152 155 140- 172 A Co-60 pCi/L 73.3 72.9 65.6 - 82.6 A Zn-65 pCi/L 109 105 94.5- 125 A Gr-A pCi/L 82.4 62.9 33.0 - 78.0 N (1)

Gr-B pCi/L 43.6 44.2 29.6-51.5 A 1-131 pCi/L 25.9 27.1 22.5-31.9 A H-3 pCi/L 15433 15800 13800 - 17400 A MRAD-16 Filter Gr-A pCi/filter 39.5 77.8 26.1 -121 A November, 2012 RAD-91 Water Sr-89 pCi/L 46.5 39.1 29.7-46.1 N (2)

Sr-90 pCi/L 16.6 20.1 14.4 -23.8 A Ba-133 pCi/L 85.2 84.8 71.3-93.3 A Cs-134 pCi/L 76.9 76.6 62.6 - 84.3 A Cs-137 pCi/L 177 183 165-203 A Co-60 pCi/L 77.4 78.3 70.5 - 88.5 A Zn-65 pCi/L 209 204 184 - 240 A Gr-A pCi/L 50.6 58.6 30.6 - 72.9 A Gr-B pCi/L 59.3 39.2 26.0 -46.7 N (2) 1-131 pCi/L 22.9 24.8 20.6 - 29.4 A H-3 pCi/L 5020 4890 4190-5380 A MRAD-17 Filter Gr-A pCi/filter 59.6 87.5 29.3 - 136 A (1) Detector G1 is slightly biased high for Th-230 based measurements used only for ERA Gross Alpha samples. NCR 12-05 (2) The Sr-89 found to known ratio was 1. 19. which TBE considers acceptable. It appears the aliquot was entered incorrectly for the Gross Beta NCR 12-13 (a) Teledyne Brown Engineeringreportedresult.

(b) The ERA known value is equal to 100% of the parameterpresent in the standardas determined by gravimetricand/or volumetric measurements made during standardpreparation.

(c) ERA evaluation: A=acceptable. Reported result falls within the Warning Limits. NA=not acceptable. Reported result falls outside of the Control Limits. CE=checkfor Error. Reported result falls within the Control Limits and outside of the Warning Limit.

B-7

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