Text

2013 Annual Radiological Environmental Operating Report
	ML14129A152
Person / Time
Site:	Millstone
Issue date:	04/30/2014
From:	Armstrong L; Dominion, Dominion Nuclear Connecticut
To:	; Document Control Desk, NRC/FSME, Office of Nuclear Reactor Regulation
References
	14-188
	Download: ML14129A152 (101)
	v • d • e

Dominion Nuclear Connecticut, Inc.

Rope Ferry Rd., \\*iterford. (C1T 06385 Dominion Mailing Address: P0. Box 128 Waterford, CTI (06385 dort.n on APR 3 0 2014 U.S. Nuclear Regulatory Commission Serial No.14-188 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 2013 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT This letter transmits the Annual Radiological Environmental Operating Report for the Millstone Power Station, for the period January 2013 through December 2013. 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.

Sincerely, L. J. Armstrong Director, Nuclear Station Safety and Licensing 0

Serial No.14-188 2013 Annual Radiological Environmental Operating Report Page 2 of 4 Attachments: 1 Commitments made in this letter:

1. None.

cc: U. S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 S. J. Giebel NRC Project Manager Millstone Unit 1 U.S. Nuclear Regulatory Commission Two White Flint North, Mail Stop T-8 F5 11545 Rockville Pike Rockville, MD 20852-2738 L. A. Kauffman NRC Inspector U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 H. W Anagnostopoulos NRC Inspector U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 M. C. Thadani NRC Project Manager Millstone Units 2 and 3 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.14-188 2013 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. 0. Box 97 Millford, CT 06460

Serial No.14-188 2013 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.14-188 Do*cket Nos. 50-245 50-336 50-423 Lice-nse Nos. DPR-21 DPR-65 NPF-49 ATTACHMENT 1 2013 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION UNITS 1, 2, AND 3 DOMINION NUCLEAR CONNECTICUT, INC. (DNC)

Millstone Power Station 2013 Radiological Environmental Operating Report January 1, 2013 - December 31, 2013 Dominion Nuclear Connecticut, Inc.

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

'Dominionr

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM 2013 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 2013

~ TABLE OFCONTENTS EXECUTIVE SUM M ARY ....................................................................................... 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. PROG RAM DESCRIPTIO N ....................................................................... 2-1 2.1 Sam pling Schedule and Locations .................................................... 2-1 2.2 Sam ples Collected During Report Period .......................................... 2-5 2.3 Required Samples Not Collected During the Report Period .............. 2-6

3. RADIO CHEM ICAL RESULTS .................................................................... 3-1 3.1 Sum m ary Table ................................................................................. 3-1 3.2 Data Tables ....................................................................................... 3-7

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

5. COMPARISON TO EFFLUENT DOSE CALCULATION ............................ 5-1

6. REFERENCES ........................................................................................... 6-1 APPENDIX A - LAND USE CENSUS FOR 2013 ......................................... A-1 APPENDIX B -

SUMMARY

OF INTERLABORATORY COMPARISONS ........ B-1 APPENDIX C - Erratum ............................................................................... C-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 EXECUTIVE

SUMMARY

INTRODUCTION This report summarizes the results of the Radiological Environmental Monitoring Program (REMP) conducted in the vicinity of the Millstone Nuclear Power Station (Millstone) during the period from January 1 to December 31, 2013. This document has been prepared in accordance with the requirements of the separate Technical Specifications for Millstone Units 1, 2 and 3.

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

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

During 2013, there were 964 samples collected from the atmospheric, aquatic, and terrestrial environments. In addition, 176 exposure measurements were obtained using environmental thermoluminescent dosimeters (TLDs). A discussion of all discrepancies from the sample collection requirements in the Millstone Radiological Effluent Monitoring and Offsite Dose Calculation Manual (REMODCM) is given in Section 2.3 of this report.

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

LAND USE CENSUS The annual land use census in the vicinity of Millstone was conducted as required by the Millstone REMODCM. Typically the cow milk locations are identified by a review of the annual registration information obtained from the State of Connecticut Department of Agriculture. Gardens are located by a drive-by during the harvest season. Although broadleaf sampling was performed and may be used in lieu of a garden census, gardens were included in the 2013 census. Only vegetable gardens having an area of more than 500 square feet need to be identified. Due to the difficulty of measuring individual gardens, the nearest garden within each directional sector identified by a drive-by survey is listed. Garden distances are based on nearest resident assuming that a resident may plant a new garden.

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

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

There was plant related activity detected in one of the onsite well samples. Details are given in Section 4.10. All other terrestrial samples collected as part of the Millstone REMP did not show any plant related activity.

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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. Plant related radioactivity was found in four flora (seaweed) samples. Details are given in Section 4.16. Plant related radioactivity was also found in several fish and oysters samples. Details are given in Sections 4.17 and 4.19 Offsite ambient radiation measurements using environmental TLDs beyond the site boundary ranged between 43 and 96 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 2013, radiation doses to the general public as a result of Millstone's operation continued to be well below the federal limits and much less than the dose due to other sources of man-made (e.g., X-rays, medical) and naturally-occurring (e.g., cosmic, radon) radiation.

The calculated total body dose to the maximally exposed member of the general public from radioactive effluents and ambient radiation resulting from Millstone operations for 2013 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 2013 REMP for Millstone resulted in the collection and analysis of over a thousand environmental samples and measurements. The data obtained were used to determine the impact of Millstone's operation on the environment and on the general public.

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

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

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013

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

1.1 Overview The REMP for 2013 performed by Dominion Nuclear Connecticut (DNC) for Millstone 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 Millstone's Technical Specifications (section 5.7.2 for Millstone Unit 1, section 6.9.1.6 for Millstone Unit 2 and Section 6.9.1.3 for Millstone Unit 3), summarizes the results of measurements of radiation and radioactivity in the environment in the vicinity of the Millstone and at distant locations during the period January 1 to December 31, 2013.

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

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

In order to more fully understand how a nuclear power 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 Millstone.

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 2013 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 'i' is for 'milli', or one-thousandth of a 'rem.' The word 'rem' is an acronym for roentgen equivalent man. One rem is equal to a 'rad' multiplied by factors to account for type of radiation and distribution within the body. The word 'rad' is an acronym for radiation absorbed dose. One rad is equal to the absorption of 100 ergs of energy per gram of tissue.

The natural and man-made radiation dose received in one year by the average American is 300 to 600 mrem (References 2, 3, 4 & 5). The per capita dose has increased since the mid 1980's because of the increased usage of medical procedures involving exposure to 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 one-trillionth of a Curie and is equal to 0.037 disintegrations per second (2.22 disintegrations per minute).

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

Table 1.3 Radiation Sources and CorresDondina 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 2013 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 Millstone generates about 2100 megawatts of electricity at full power, which provides approximately one-third of the power consumed in the State of Connecticut. Millstone Unit 2 and Millstone Unit 3 are pressurized water reactors (Millstone Unit 1, which is permanently shutdown, was a boiling water reactor). The nuclear station is located on an approximate 500-acre site about 5 kilometers (three miles) west of New London, Connecticut.

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

Millstone was operational during most of 2013, with the exception of a refueling outage at Millstone Unit 3 in April. The annual capacity factor for Millstone Unit 2 was 98.3% and for Millstone Unit 3 was 89.2%.

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 Millstone is the Niantic Bay.

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Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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 2013 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.

/Radiation Uranium Fission Products ns 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 2013 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).

collision, With n 10ý Stable Radioactive Neutron Cobalt Nucleus Cobalt Nucleus Figure 1.4-2 Radioactive Activation Product Formation At Millstone 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 2013 SIMPLIFIED DIAGRAM OF A PRESSURIZED WATER REACTOR -

Pressurized water reactor-a common type of Light Water Reactor L (LWR)

COOUING i *TCONDENSE' WASTE NEAT TOTHE ENVUIRMMENT 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 2013 The fifth barrier is the secondary containment or enclosure building. The enclosure building is a steel building that surrounds the primary containment. This barrier is an additional safety feature at Millstone's reactor units to contain radioactivity that may escape from the primary containment. This enclosure building is equipped with a filtered ventilation system that is used when needed to reduce the radioactivity that escapes from the primary containment.

The five barriers confine most of the radioactive fission and activation products. However, small amounts of radioactivity do escape via mechanical failures and maintenance on valves, piping, and equipment associated with the reactor cooling water system. The small amounts of radioactive liquids and gases that do escape the various containment systems are further controlled by the liquid purification and ventilation filtration systems. 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 Millstone 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 2013 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 Millstone Unit

3) 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 2013 Gases from the primary coolant are held up in waste gas decay tanks for decay at Millstone Unit 2. Gaseous waste at Millstone Unit 3 is purified through a process gas system, consisting of high-efficiency particulate air filters and charcoal adsorber beds. Gases from periodic venting of the Millstone Unit 2 containment are released through a similar process system (Enclosure Building Filtration System) while gases from the Millstone Unit 3 containment vacuum pumps are released without treatment. If necessary, Millstone Unit 3 containment air can be filtered by an internal particulate and charcoal treatment system.

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

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 Millstone Unit 3, for Millstone Unit 2 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 Millstone Unit 2). 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.

1-10

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 1.6 Radiolo-gical 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 Millstone'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 Millstone during each year are reported to the NRC annually in the Radiological Effluent Release Report (RERR). Similar to this report, the RERR is submitted annually to the NRC. The liquid and gaseous effluents were well below the federal release limits and were a small percentage of the Millstone REMODCM effluent control limits.

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

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

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

1-11

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 EXAMPLES OF Millstone's RADIATION EXPOSURE PATHWAYS N.

RN .................

LIQUID ................

EFFLUENTS

4. DIRECT RADIATION

, (SOIL DEPOSITION)

(AIR SUBMERSION)

1. SHORELINE DIRECT RADIATION (FISHING, PICNICJNG)

Q 5. CONSUMPTION (VEGETATION)

DEPOSITION

2. DIRECT RADIATION (IMMERSION IN OCEAN,

. BOATING, SWIMMING)

6. CONSUMPTION DEPOSITION (MILK AND MEAT-)

INGESTION 1UN

3. CONSUMPTION FS I PT' ISH, SHELLFISH)

.116-016,10e .. . ...................

......... INGESTION Figure 1.6 Radiation Exposure Pathways 1-12

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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 the ground;

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.

Ambient (direct) radiation emitted from contained sources of radioactivity at Millstone comes from low-level radioactive waste being processed and stored at the site prior to shipping and disposal. Also, the operation of the Independent Spent Fuel Storage Installation (ISFSI) which began in 2005 results in a small amount of direct radiation at the site boundary.

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

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

1-13

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 After dose calculations are performed, the results are compared to the dose limits for the public as specified in NRC's technical specifications for Millstone (References 9-11).

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

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

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

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

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

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

less than or equal to 15 mrem per year to any organ from iodine-1 31, iodine-133, tritium, and all particulate radionuclides with half-lives greater than 8 days.

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

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

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

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

The third stage of assessing releases to the environment is the REMP. The description and results of the REMP at Millstone during 2013 is discussed in Sections 2 through 4 of this report.

1-14

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013

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 2013 Table 2-1 Environmental Monitoring Proqram Sampling Types and Locations Distance, Direction No.- From Release Type* Location Name Point**" Sample Media 1-1 Onsite - Old Millstone Rd. 0.6 Mi, NNW TLD, Air Particulate, Iodine, Vegetation 2-I Onsite - Weather Shack 0.3 Mi, S TLD, Air Particulate, Iodine 3-1 Onsite - Bird Sanctuary 0.3 Mi, NE TLD, Air Particulate, Iodine, Soil 4-1: Onsite - Albacore Drive 1.0 Mi, N TLD, Air Particulate, Iodine, Soil 5-1.. Onsite - MP3 Discharge 0.1 Mi, SSE TLD 6-1. Onsite - Quarry Discharge 0.3 Mi, SSE TLD 7-1 Onsite - Environmental Lab Dock 0.3 Mi, SE TLD 8-1. Onsite - Environmental Lab 0.3 Mi, SE TLD 9-1 Onsite - Bay Point Beach 0.4 Mi, W TLD 10-. Pleasure Beach 1.2 Mi, E TLD, Air Particulate, Iodine, Vegetation New London Country Club 1.6 Mi, ENE TLD, Air Particulate, Iodine 12-X Fisher's Island, NY 8.0 Mi, ESE TLD 13-C Mystic, CT 11.5 Mi, ENE TLD 14-C Ledyard, CT 12.0 Mi, NE TLD, Soil 16: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 227X Cow 10.5 Mi, WNW Milk Goat Location #1 2.0 Mi, N Milk 24-C Goat Location #3 29.0 Mi, NNW Milk 25-1 Within 10 Miles < 10 Miles Vegetation 25-X Within 10 Miles < 10 Miles Fruits and/or Vegetables***

26.-C Beyond 10 Miles > 10 Miles Vegetation 26-X Beyond 10 Miles > 10 Miles Fruits and/or Vegetables***

27-I1. Niantic 1.7 Mi, WNW TLD, Air Particulate, Iodine 28-1 Two Tree Island 0.8 Mi, SSE Mussels, Fish****

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-I". Vicinity of Discharge <0.1 Mi Bottom Sediment, Oysters, Lobster, Fish****, Seawater 32-X Vicinity of Discharge <0.1 Mi Fucus 33-1I Seaside Point 1.8 Mi, ESE Bottom Sediment 34-* Thames River Yacht Club 4.0 Mi, ENE Bottom Sediment 34-X Thames River Yacht club 4.0 Mi, ENE Oysters 35-I Niantic Bay 0.3 Mi, WNW Lobster, Fish****

.35-X Niantic Bay 0.3 Mi, WNW Mussels, Fucus

.36-*Xi Black Point 3.0 Mi, WSW Fucus 37-C Giant's Neck 3.5 Mi, WSW Bottom Sediment, Oysters, Seawater 381I Waterford Shellfish Bed #1 1.0 Mi, NW Clams 39-X Jordan Cove Bar 0.8 Mi, NE Bottom Sediment

Types: 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.

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

- - - 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 2013 No.- .Distance, Direction Type*. Location Name From Release Point** Sample Media 41-1 Myrock Avenue 3.2 Mi, ENE TLD 42-i Billow Road 2.4 Mi, WSW TLD 43-1I Black Point 2.6 Mi, SW TLD 44-1I 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 51-1I East Lyme - Smith Ave. 1.5 Mi, NW TLD 52-1 Waterford - River Rd. 1.1 Mi, NNW TLD 53-1 Waterford - Gardiners Wood Rd 1.4 Mi, NNE TLD 55-1 Waterford - Magonk Point 1.8 Mi, ESE TLD 56-1. New London - Mott Ave. 3.7 Mi, E TLD 57-1 New London - Ocean Ave. 3.6 Mi, ENE TLD 59-1 Waterford -Miner Ave. 3.4 Mi, NNE TLD 60-1 Waterford - Parkway South 4.0 Mi, N TLD 61-1 Waterford - Boston Post Rd. 4.3 Mi, NNW TLD 62-1 East Lyme - Columbus Ave. 1.9 Mi, WNW TLD 63-1 Waterford - Jordon Cove Rd. 0.8 Mi, NE TLD 64-1 Waterford - Shore Rd. 1.1 Mi, ENE TLD 65-1 Waterford - Bank St. 3.2 Mi, NE TLD 66-X NAP Parking Lot - Fit Center 0.4 Mi, NW TLD 67-X Golden Spur 4.7 Mi, NNW Bottom Sediment 71-1 1-MW-XFMR-03 Onsite Well Water 72-1 MW-GPI-1 Onsite Well Water 73-X Site Switchyard Fence 0.3 Mi, N TLD 74-X Ball Field Foul Pole 0.6 Mi, N TLD

75-X Waterford - Windward Way & Shotgun 0.5 Mi, NE TLD 76-X, ISFSI-1 Up-gradient of ISFSI Well Water 77-X ISFSI-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-I MW-7C*** Onsite Well Water 81-1 S2-MW-1 Onsite Well Water 82-1 MW-6B Onsite Well Water 83-1 S3-MW-2*** Onsite Well Water 88-1 DEEP Dock 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.

- - Well S3-MW-2 replaced Well MW-7C in 4 th quarter of 2013.

2-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 Table 2-2 Required Sampling Frquency & Type of Analysis Exposure Pathway No. of Sampling & Collection Type of Analysis and/or Sample Locations ......... Frequency

1. Gamma Dose - 39a 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 (edible portion) I I II (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 2013 2.2 Samples Collected During Report Period The following table summarizes the number of samples of each type collected and analyzed during 2013:

Number of Number of lTechnical Specification Specification Number of Sample Type Extra Samples Required Samples Required AnalyzedSamples.

Analyzed Gamma Exposure 156 156 20 (Environmental TLD)

Air Particulates 416 416 0 Air Iodine 416 416 0 Soil 3 3 0 Cow and Goat Milk 36 01 18 2

Pasture Grass/Feed Variable 10 14 Broad Leaf Vegetation, 10 10 6 Fruit, Vegetables Well Water 12 12 22 Sea Water 16 16 0 Bottom Sediment 10 10 4 Aquatic Flora 0 0 20 Fish 16 123 0 Mussels 8 13 0 Oysters 16 16 0 Clams 8 8 0 Lobster 8 8 0 Total All Types 1,131 1,120 90 I

1 Pasture grass sampled as necessary to substitute for unavailable milk.

2 Depends upon availability of milk samples. Pasture grass could not be collected during some parts of the year and feed was substituted.

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 2013 2.3 Required Samples Not Collected During the Report Period During 2013 there were eleven required samples not collected. These included four fish samples of which two types are required to be collected at two locations quarterly (16 total) and seven mussel samples which are required to be collected at two locations quarterly (8 total). Repeated attempts were made to collect fish during the first quarter (January thru March) but were unsuccessful. Mussels were not available or the sample collected was too small for analyses at both required locations in all quarters of the year except for the second quarter (April thru June) at Niantic Shoals (Location #30).

Goat rbilk samples were not collected during 2013 because the goat owners at the two required locations were nbt milking their goats. No other milking goats could be located within ten miles of the plant. However, the REMODCM requires pasture grass as a substitute for goat milk when milk is not available. Pasture grass was collected at both locations during five months (April thru September) for a total of ten pasture grass samples.

For the other months (January thru April and October thru December) feed was substituted for the required pasture grass.

Because of a loss of power there was an insufficient volume of air collected on the weekly air sample for November 26 at the onsite Weather Shack (Location #2). Therefore the LLD requirements for gross beta of 0.01 pCi/m 3 and for iodine of 0.07 pCi/m 3 could not be met for that one week.

2-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013

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

A more detailed analysis of the data is given in Section 4.0 where a discussion of the variations in the data explains many aspects 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 2013 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2013 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 176 NA 7.7 09 0.04 Mi. 11.1 7.6 Radiation Dose (4.6-11.5) W (10.4 - 11.5) (5.6-9.4)

TLD (uRlhr)

Air Iodine 1-131 416 70 <LLD NA NA <LLD <LLD (pCi/m3)

Air Particulate GR-B 416 10 14.8 02 0.3 Mi. 15.6 15.1 (pCi/m 3) (4.5 -43.8) S (7.2 -43.8) (6.1 -29.3)

GAMMA 32 Be-7 NA 110 15 14.0 Mi. 120 120 (75-167) N (104-142) (104-142)

Other Note 2 <LLD NA NA <LLD <LLD Gammas Soil GAMMA 3 (pCi/g dry) K-40 NA 17.7 03 0.03 Mi. 19.8 17.4 (15.5 - 19.8) NE Cs-137 0.18 0.36 04 1.0 Mi. 0.537 0.101 (0.183 - 0.537) N Other Note 3 <LLD NA NA <LLD <LLD Gammas Milk Sr-89 4 10 <LLD NA NA <LLD NA (pCi/l)

Sr-90 4 2 <LLD NA NA <LLD NA GAMMA 18 K-40 NA 1310 22 2.7 Mi. 1310 NA (1180 - 1485) NE (1180 - 1485)

Other Note 4 <LLD NA NA <LLD <LLD Gammas Pasture GAMMA 34 Grass/Hay Be-7 NA 0.97 21 2.0 Mi. 0.97 0.65 (pCi/g wet) (0.15 -1.60) N (0.15 -1.60) (0.20 -1.19)

K-40 NA 9.02 21 2.0 Mi. 9.02 7.46 (3.41 - 17.62) N (3.41 - 17.62) (3.33- 14.36)

Cs-137 0.08 <LLD NA NA <LLD <LLD Other Note 5 <LLD NA NA <LLD <LLD Gammas 3-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2013 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)

Well Water H-3 34 2000 Note 6 MW-7C NA Note 6 NA (pCO)

GAMMA 34 Be-7 NA <LLD NA NA <LLD NA K-40 NA Note 7 NA Onsite Note 7 NA Other Note 8 <LLD NA NA <LLD <LLD Gammas Fruits & GAMMA 6 Vegetables K-40 NA 1.95 26 Beyond 10 miles 1.95 1.91 (pCi/g wet) (0.604 - 4.32) (0.604 - 4.32) (0.604 - 4.32)

Other Note 9 <LLD NA NA <LLD <LLD Gammas Broad Leaf GAMMA 10 Vegetation Be-7 NA 1.01 1 0.6 Mi 1.19 1.32 (pCi/g wet) (0.594 -1.38) NNW (1.12 - 1.26) (1.06 - 1.57)

K-40 NA 3.61 17 0.5 Mi 3.72 3.98 (3.11 - 4.33) NE (3.68 - 4.51)

Cs-1 37 0.08 <LLD NA NA <LLD <LLD Other Note 9 <LLD NA NA <LLD <LLD Gammas Sea Water H-3 15 3000 597 32 < 0.1 Mi 597 <LLD (pCi/I) (205- 1080) (205 - 1080)

GAMMA 15 K-40 NA 312 32 < 0.1 Mi 312 279 (243-365) (243-365) (253-311)

Other Note 8 <LLD NA NA <LLD <LLD Gammas Bottom GAMMA 14 Sediment K-40 NA 17.4 67 4.7 Mi. 21.1 14.9 (pCi/g dry) (10.3 - 22.0) Note 10 NNW (20.9 - 21.3)

Cs-1 37 0.18 0.182 67 4.7 Mi. 0.182 <LLD Note 10 NNW, Other Note 3 <LLD NA NA <LLD <LLD Gammas 3-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 RADIOLOCIAL ENVIRONMENT MONITORING PROGRAM

SUMMARY

MILLSTONE POWER STATION Dockets 50-245, 50-336 & 50-423 2013 Medium or Indicator Control Pathway Analysis Total LLD' Locations Location with Highest Mean Locations Sampled Type Number Mean Distance Mean Mean (Units) (Range) Number Direction (Range) (Range)

Aquatic Flora GAMMA 20 (pCi/g wet) Be-7 NA 0.081 29 0.4 Mi 0.113 0.125 (0.015 - 0.204) Note 12 NNE (0.032 - 0.204) (0.083 - 0.225)

K-40 NA 7.29 32 < 0.1 Mi 8.96 6.25 (4.93 - 10.54) Note 12 (7.21 - 10.54) (5.58 - 7.68)

Co-58 NA 0.026 32 < 0.1 Mi 0.026 <LLD Note 12 Ag-110m NA 0.019 32 < 0.1 Mi 0.019 <LLD Note 12 1-131 0.06 0.034 32 < 0.1 Mi 0.034 <LLD Note 12 Ac-228 NA 0.066 29 0.4 Mi 0.077 0.072 (0.038 - 0.107) Note 12 NNE (0.041 - 0.137)

Other Note 9 <LLD NA NA <LLD <LLD Gammas Fish - GAMMA 6 Flounder K-40 NA 4.58 35 0.3 Mi 4.68 NA (pCi/g wet) (4.00 - 5.07) WNW (4.16 - 5.07)

All Note 13 <LLD NA NA <LLD NA Gammas Fish - Other GAMMA 6 (pCi/g wet) K-40 NA 4.33 32 <0.1 Mi 4.85 NA (3.73 - 4.85)

Other Note 13 <LLD NA NA <LLD NA Gammas Mussels GAMMA 1 (pC0/g wet) K-40 NA 1.42 30 1.5 Mi 1.42 NA NNW Other Note 13 <LLD NA NA <LLD NA Gammas Oysters GAMMA 16 (pCi/g wet) K-40 NA 2.09 32 <0.1 Mi 2.37 1.70 (1.31 - 2.87) (2.04 - 2.87)

AG-110M 0.032 32 <0.1 Mi 0.106 <LLD

(<LLD - 0.194) (0.012 - 0.194)

Other Note 13 <LLD NA NA <LLD <LLD Gammas Clams GAMMA 8 (pC0/g wet) K-40 NA 2.26 38 1.0 Mi 2.25 NA (1.91 - 2.77) NW (1.91 - 2.77)

Other Note 13 <LLD NA NA <LLD NA Gammas Lobster GAMMA 8 (pCi/g wet) K-40 NA 3.20 32 <0.1 Mi 3.20 NA (2.53 - 3.85) (2.53 - 3.85)

Other Note 13 <LLD NA NA <LLD NA Gammas 3-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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/M3 for Cs-134 and 0.06 pCi/M 3 for Cs-137.

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-1 34, 18 pCi/I for Cs-1 37, 70 pCi/I for Ba-140 and 25 pCi/I for La-140.

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

6 - One well water had positive H-3 of 1110 pCi/I.

7 - One well water had positive K-40 of 64 pCi/I.

8- LLDs for water other gamma are 15 pCi/I for Mn-54, Co-58, Co-60, Nb-95, 1-131, Cs-134 and La-140; 30 pCi/I for Fe-59, Zn-65 and Zr-95; 18 pCi/I for Cs-1 37 and 60 pCi/I for Ba-140.

9 - LLDs for fruits & vegetables, broadleaf vegetation and aquatic flora for other gamma are 0.06 pCi/M 3 for 1-131, 0.06 pCi/M 3 for Cs-1 34 and 0.08 pCi/M3 for Cs-137.

10 - Location 67 is an extra, non-required sample.

11 - LLDs for other gamma are 0.15 pCi/g for Cs-1 34 and 0.18 pCi/g for Cs-1 37.

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

13 - LLDs for fish and shellfish for gammas are 0.13 pCi/g for Mn-54, Co-58, Co-60 and Cs-1 34; 0.26 pCi/g for Fe-59 and Zn-65; and 0.15 pCi/g for Cs-1 37.

3-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 Discussion of LLD The LLD at a confidence level of 95% is the smallest concentration of radioactive material in a sample that will be detected with a 5% probability of falsely concluding that a blank observation represents a "real" signal.

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

LLD- 4.66 Sb E

V

2.22

Y

exp (-AAt)

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

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

E is the counting efficiency (as counts per transformation)

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

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

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

3-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 3.2 Data Tables The data reported in this section are strictly counting statistics. The reported error is two times the standard deviation (2a) of the net activity. Unless otherwise noted, the overall error (counting, sample size, chemistry, errors, etc.) is estimated to be 2 to 5 times that listed.

Results are considered positive when the measured value exceeds 1.5 times the listed 2a error (i.e., the measured value exceeds 3a). 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 2013 TABLE 1 QUARTERLY GAMMA EXPOSURE RATE (uR/hr)*

LOCATIONS PERIOD 1 2 3 4 5 6 7 8 9 10 11

(+1-) (+/-) (+/-) (T/-) (+C-) (+-) - -)(*1-) (+- (+1-) (+--) -(+)

1Q 7.7 0.4 9.2 0.4 7.3 0.4 7.3 0.4 9.1 0.4 8.7 0.4 5.2 0.3 10.7 0.6 11.1 0.6 10.3 0.4 6.6 0.4 2Q 8.5 0.4 10.4 0.4 7.6 0.2 7.9 0.3 9.8 0.5 9.4 0.3 5.3 0.4 11.2 0.5 11.5 0.5 10.0 0.3 7.5 0.4 3Q 8.3 0.4 9.7 0.4 7.4 0.4 7.8 0.4 9.6 0.6 8.6 0.4 4.7 0.2 11.1 0.6 11.4 0.6 10.1 0.6 7.1 0.3 4Q 7.4 0.4 9.1 0.6 7.4 0.4 7.3 0.4 9.0 0.4 8.6 0.4 4.6 0.2 10.9 0.4 10.4 0.6 9.0 0.4 6.9 0.3 PERIOD 12C 13C 14C 15C 16C 27 41 42 43 44 45

(+/-) (+1-) (*1-) (+/-) (+1-) (77) (+1-) (+/-) (+T-) (+1-) (+7-)

1Q 6.9 0.5 8.3 0.4 8.9 0.4 7.4 0.3 5.9 0.3 8.0 0.4 6.7 0.4 7.0 0.3 6.4 0.3 7.7 0.5 7.5 0.5 2Q 7.2 0.2 8.7 0.4 9.4 0.3 8.4 0.3 6.1 0.3 8.7 0.3 7.2 0.2 7.5 0.3 7.2 0.3 8.9 0.3 7.5 0.5 3Q 8.2 0.4 8.9 0.4 8.9 0.4 7.5 0.4 6.3 0.3 8.0 0.4 6.6 0.4 7.1 0.3 6.6 0.3 8.0 0.4 7.2 0.3 4Q 6.7 0.3 7.8 0.4 8.5 0.4 7.0 0.3 5.6 0.3 7.8 0.4 6.5 0.3 7.1 0.3 6.7 0.4 7.0 0.3 6.7 0.3 PERIOD 46 47 48 49 50 51 52 53 55 56 57

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

1Q 8.3 0.5 7.4 0.4 9.2 0.5 6.4 0.3 7.3 0.4 5.9 0.3 6.9 0.4 7.1 0.4 7.2 0.5 6.9 0.4 7.1 0.4 2Q 8.9 0.5 8.0 0.3 9.7 0.3 7.2 0.2 7.8 0.3 6.5 0.2 7.2 0.3 7.5 0.4 8.0 0.3 7.6 0.3 7.5 0.2 3Q 8.3 0.3 7.6 0.5 9.4 0.4 7.1 0.5 7.7 0.4 6.4 0.3 7.1 0.3 7.3 0.4 7.4 0.4 6.9 0.3 7.1 0.3 4Q 7.9 0.4 7.2 0.3 8.7 0.4 6.0 0.3 7.2 0.3 5.5 0.3 6.3 0.4 6.5 0.4 6.8 0.4 6.8 0.3 6.4 0.3 PERIOD 59 60 61 62 63 64 65 66 73 74 75

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

1Q 7.2 0.4 6.1 0.4 6.9 0.3 7.5 0.4 8.3 0.4 6.8 0.4 7.5 0.4 6.5 0.3 7.5 0.4 7.1 0.4 6.4 0.3 2Q 8.1 0.4 7.0 0.3 7.5 0.2 8.0 0.2 8.7 0.3 7.7 0.2 8.4 0.4 7.2 0.3 8.0 0.3 7.7 0.3 7.1 0.3 3Q 7.8 0.3 6.9 0.6 7.3 0.3 7.8 0.4 8.0 0.5 7.1 0.4 7.7 0.3 6.8 0.3 7.6 0.5 7.7 0.3 6.7 0.3 4Q 7.4 0.4 6.1 0.4 6.6 0.3 7.1 0.3 7.8 0.4 6.7 0.3 7.0 0.3 6.8 0.4 7.6 0.3 7.0 0.3 6.5 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 3-8

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 2 AIR PARTICULATES GROSS BETA RADIOACTIVITY 3

(pCi/m )

LOCATIONS PERIOD ENDING 01-(+/-) 02 03 04 10 11 27 15C

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

01108/13 0.026 0.004 0.028 0.004 0.026 0.004 0.025 0.004 0.027 0.004 0.028 0.004 0.028 0.004 0.029 0.005 01/15/13 0.019 0.003 0.022 0.004 0.018 0.003 0.021 0.003 0.018 0.003 0.021 0.003 0.020 0.003 0.024 0.004 01/22/13 0.017 0.004 0.016 0.004 0.015 0.003 0.017 0.003 0.016 0.003 0.013 0.003 0.016 0.003 0.018 0.004 01/29/13 0.015 0.003 0.014 0.003 0.015 0.003 0.014 0.003 0.017 0.003 0.015 0.003 0.014 0.003 0.014 0.003 02/05/13 0.020 0.004 0.021 0.004 0.022 0.004 0.020 0.003 0.025 0.004 0.020 0.003 0.020 0.003 0.020 0.004 02/13/13 0.017 0.003 0.020 0.004 0.015 0.003 0.016 0.003 0.015 0.003 0.016 0.003 0.016 0.003 0.017 0.003 02/20/13 0.011 0.003 0.017 0.004 0.012 0.003 0.017 0.003 0.016 0.003 0.017 0.003 0.015 0.003 0.016 0.003 02/26/13 0.009 0.003 0.007 0.003 0.010 0.003 0.006 0.002 0.007 0.002 0.009 0.002 0.007 0.002 0.009 0.003 03/05/13 0.011 0.003 0.007 0.003 0.013 0.003 0.008 0.003 0.008 0.003 0.013 0.003 0.014 0.004 0.013 0.003 03/12/13 0.009 0.003 0.010 0.004 0.007 0.003 0.006 0.003 0.007 0.003 0.008 0.003 0.008 0.003 0.009 0.003 03/18/13 0.015 0.004 0.018 0.004 0.015 0.004 0.015 0.004 0.017 0.004 0.018 0.004 0.019 0.004 0.016 0.004 03/26/13 0.012 0.003 0.011 0.003 0.012 0.003 0.009 0.003 0.009 0.003 0.011 0.003 0.010 0.003 0.009 0.003 04/02/13 0.007 0.003 0.008 0.003 0.008 0.003 0.010 0.003 0.007 0.003 0.007 0.003 0.008 0.003 0.006 0.003 04/09/13 0.017 0.003 0.018 0.004 0.018 0.003 0.017 0.003 0.013 0.003 0.018 0.003 0.017 0.004 0.016 0.003 04/15/13 0.007 0.003 0.010 0.003 0.008 0.003 0.008 0.003 0.015 0.004 0.010 0.003 0.011 0.004 0.010 0.003 04/23/13 0.013 0.003 0.012 0.003 0.012 0.003 0.010 0.003 0.012 0.003 0.011 0.003 0.014 0.003 0.012 0.003 04/30/13 0.014 0.003 0.013 0.003 0.013 0.003 0.016 0.003 0.014 0.003 0.014 0.003 0.011 0.003 0.015 0.004 05/07/13 0.012 0.003 0.008 0.003 0.010 0.003 0.011 0.003 0.008 0.003 0.009 0.003 0.012 0.003 0.011 0.003 05/14/13 0.007 0.003 0.009 0.003 0.008 0.003 0.009 0.003 0.010 0.004 0.009 0.003 0.011 0.004 0.010 0.004 05/21/13 0.015 0.003 0.012 0.003 0.014 0.003 0.013 0.003 0.015 0.003 0.012 0.003 0.013 0.003 0.017 0.004 05/28/13 0.005 0.002 0.007 0.003 0.007 0.003 0.007 0.003 0.011 0.003 0.009 0.003 0.008 0.003 0.007 0.003 06/04/13 0.017 0.004 0.013 0.003 0.014 0.003 0.015 0.003 0.016 0.004 0.011 0.003 0.017 0.004 0.017 0.004 06111/13 0.010 0.003 0.009 0.003 0.011 0.003 0.007 0.003 0.010 0.003 0.008 0.003 0.007 0.003 0.009 0.003 06/18/13 0.018 0.004 0.013 0.003 0.017 0.004 0.013 0.003 0.013 0.003 0.014 0.003 0.016 0.003 0.015 0.003 06/25/13 0.013 0.003 0.013 0.003 0.013 0.003 0.017 0.004 0.012 0.003 0.011 0.003 0.013 0.003 0.014 0.003 07/02/13 0.014 0.003 0.015 0.003 0.014 0.003 0.017 0.003 0.014 0.003 0.017 0.003 0.012 0.003 0.014 0.003 3-9

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 2 AIR PARTICULATES GROSS BETA RADIOACTIVITY (pCi/m3)

LOCATIONS PERIOD ENDING 01 02 03 04 10 11 27 15C 07/09/13 0.012 0.003 0.013 0.003 0.012 0.003 0.011 0.003 0.014 0.003 0.013 0.003 0.009 0.003 0.015 0.004 07/16/13 0.013 0.004 0.015 0.003 0.014 0.004 0.016 0.004 0.013 0.003 0.015 0.003 0.013 0.003 0.013 0.003 07/23/13 0.016 0.003 0.018 0.003 0.020 0.003 0.018 0.003 0.018 0.003 0.021 0.003 0.021 0.003 0.021 0.003 07/30/13 0.014 0.003 0.011 0.003 0.011 0.003 0.012 0.003 0.012 0.003 0.012 0.003 0.015 0.003 0.012 0.003 08/06/13 0.012 0.003 0.015 0.003 0.015 0.004 0.012 0.003 0.015 0.003 0.013 0.003 0.011 0.003 0.012 0.003 08/13/13 0.015 0.003 0.015 0.003 0.012 0.003 0.013 0.003 0.012 0.003 0.012 0.003 0.013 0.003 0.014 0.003 08/20/13 0.017 0.003 0.018 0.003 0.018 0.004 0.015 0.003 0.018 0.003 0.018 0.003 0.016 0.003 0.018 0.003 08/27/13 0.017 0.004 0.018 0.004 0.015 0.004 0.017 0.004 0.016 0.003 0.015 0.003 0.019 0.004 0.016 0.003 09/03/13 0.018 0.004 0.017 0.003 0.019 0.004 0.020 0.004 0.018 0.003 0.020 0.004 0.017 0.003 0.021 0.004 09/10/13 0.013 0.003 0.014 0.003 0.014 0.003 0.012 0.003 0.012 0.003 0.013 0.003 0.011 0.003 0.013 0.003 09/17/13 0.022 0.004 0.026 0.004 0.023 0.004 0.019 0.004 0.022 0.004 0.024 0.004 0.023 0.004 0.024 0.004 09/24/13 0.010 0.003 0.011 0.003 0.011 0.003 0.011 0.003 0.010 0.003 0.011 0.003 0.008 0.003 0.011 0.003 10/01/13 0.010 0.003 0.012 0.003 0.013 0.004 0.006 0.003 0.007 0.003 0.010 0.003 0.012 0.003 0.010 0.003 10/08/13 0.026 0.004 0.022 0.004 0.026 0.004 0.023 0.004 0.027 0.004 0.026 0.004 0.024 0.004 0.025 0.004 10/15/13 0.019 0.004 0.020 0.004 0.017 0.004 0.017 0.003 0.018 0.003 0.017 0.003 0.019 0.003 0.018 0.003 10/22/13 0.017 0.004 0.019 0.004 0.019 0.004 0.020 0.004 0.023 0.004 0.018 0.004 0.018 0.003 0.021 0.004 10/29/13 0.013 0.004 0.014 0.003 0.013 0.004 0.013 0.003 0.016 0.003 0.009 0.003 0.014 0.003 0.011 0.003 11/05/13 0.020 0.004 0.019 0.004 0.020 0.004 0.019 0.004 0.021 0.003 0.019 0.004 0.021 0.004 0.021 0.004 11/12/13 0.012 0.003 0.013 0.003 0.015 0.004 0.009 0.003 0.012 0.003 0.013 0.003 0.011 0.003 0.011 0.003 11/19/13 0.014 0.003 0.015 0.004 0.015 0.003 0.012 0.003 0.014 0.003 0.012 0.003 0.012 0.003 0.018 0.004 11/26/13 0.012 0.003 0.044 0.017 0.012 0.003 0.011 0.003 0.013 0.003 0.014 0.003 0.015 0.003 0.013 0.003 12/03/13 0.011 0.003 0.013 0.003 0.012 0.003 0.013 0.003 0.011 0.003 0.010 0.003 0.013 0.003 0.011 0.003 12/10/13 0.022 0.004 0.023 0.004 0.021 0.003 0.023 0.004 0.022 0.004 0.022 0.004 0.023 0.004 0.020 0.003 12/17/13 0.019 0.004 0.019 0.004 0.021 0.004 0.021 0.004 0.014 0.003 0.022 0.004 0.018 0.004 0.019 0.004 12/23/13 0.020 0.004 0.018 0.004 0.019 0.004 0.019 0.004 0.019 0.004 0.018 0.004 0.017 0.004 0.016 0.004 12/30/13 0.014 0.003 0.020 0.004 0.013 0.003 0.020 0.004 0.016 0.004 0.016 0.004 0.017 0.004 0.017 0.004 3-10

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 3 AIRBORNE IODINE 3

(pCi/m )

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

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

01/08/13 0.013 0.040 0.014 0.041 0.012 0.037 0.012 0.036 0.005 0.033 0.005 0.033 0.005 0.034 0.006 0.040 01/15/13 -0.001 0.019 -0.001 0.019 -0.001 0.018 -0.001 0.017 -0.016 0.022 -0.016 0.021 -0.016 0.022 -0.019 0.026 01122/13 0.021 0.022 0.021 0.021 0.020 0.020 0.019 0.020 -0.005 0.020 -0.005 0.019 -0.005 0.019 -0.006 0.023 01/29/13 -0.007 0.038 -0.007 0.038 -0.006 0.035 -0.006 0.035 -0.010 0.031 -0.010 0.030 -0.010 0.031 -0.012 0.037 02/05/13 0.005 0.037 0.005 0.039 0.005 0.035 0.005 0.034 0.007 0.032 0.006 0.030 0.006 0.031 0.008 0.037 02/13113 -0.007 0.023 -0.010 0.030 -0.007 0.022 -0.007 0.021 0.019 0.029 0.016 0.025 0.019 0.029 0.020 0.031 02/20/13 -0.016 0.018 -0.017 0.018 -0.015 0.017 -0.015 0.016 -0.012 0.019 -0.011 0.017 -0.012 0.019 -0.012 0.019 02/26/13 -0.033 0.036 -0.035 0.039 -0.032 0.035 -0.031 0.034 -0.033 0.035 -0.030 0.032 -0.033 0.034 -0.033 0.035 03/05/13 0.007 0.023 0.007 0.024 0.007 0.021 0.006 0.021 -0.010 0.028 -0.009 0.025 -0.010 0.027 -0.010 0.028 03/12/13 0.025 0.029 0.027 0.031 0.024 0.027 0.023 0.027 0.021 0.029 0.019 0.027 0.021 0.029 0.021 0.029 03/18/13 0.001 0.036 0.001 0.037 0.001 0.034 0.001 0.033 -0.010 0.033 -0.009 0.030 -0.010 0.032 -0.010 0.033 03/26/13 -0.010 0.019 -0.011 0.020 -0.010 0.018 -0.010 0.017 -0.012 0.025 -0.011 0.023 -0.011 0.025 -0.012 0.026 04/02/13 -0.025 0.032 -0.027 0.035 -0.024 0.031 -0.023 0.030 -0.032 0.044 -0.030 0.040 -0.032 0.044 -0.033 0.044 04/09/13 0.005 0.036 0.005 0.039 0.004 0.034 0.004 0.034 -0.005 0.027 -0.005 0.026 -0.005 0.029 -0.005 0.029 04/15/13 0.014 0.021 0.013 0.019 0.014 0.020 0.014 0.020 0.007 0.018 0.007 0.017 0.008 0.019 0.007 0.019 04/23/13 -0.012 0.026 -0.011 0.023 -0.012 0.025 -0.012 0.025 -0.002 0.027 -0.002 0.025 -0.002 0.028 -0.002 0.028 04/30/13 0.006 0.022 0.005 0.020 0.005 0.022 0.005 0.021 0.015 0.017 0.014 0.016 0.015 0.018 0.015 0.017 05/07/13 0.020 0.036 0.018 0.032 0.019 0.035 0.019 0.034 -0.006 0.038 -0.005 0.035 -0.006 0.039 -0.006 0.039 05/14/13 -0.006 0.035 -0.005 0.031 -0.006 0.034 -0.005 0.032 0.000 0.018 0.000 0.016 0.000 0.019 0.000 0.019 05/21/13 -0.004 0.037 -0.004 0.034 -0.004 0.037 -0.004 0.033 -0.020 0.031 -0.018 0.028 -0.020 0.031 -0.020 0.031 05/28/13 -0.007 0.025 -0.006 0.022 -0.007 0.025 -0.007 0.023 0.014 0.035 0.013 0.031 0.015 0.036 0.015 0.036 06/04/13 0.028 0.036 0.026 0.033 0.028 0.036 0.026 0.034 0.009 0.035 0.008 0.031 0.009 0.035 0.009 0.036 06/11/13 0.004 0.042 0.004 0.039 0.004 0.042 0.004 0.039 0.016 0.034 0.014 0.031 0.017 0.035 0.016 0.035 06/18/13 0.009 0.019 0.008 0.017 0.009 0.019 0.009 0.018 -0.024 0.022 -0.021 0.020 -0.024 0.023 -0.025 0.023 06/25/13 -0.042 0.029 -0.038 0.026 -0.041 0.028 -0.038 0.026 -0.013 0.025 -0.014 0.028 -0.014 0.027 -0.014 0.026 07/02/13 -0.005 0.019 -0.005 0.018 -0.005 0.019 -0.005 0.018 -0.022 0.018 -0.024 0.020 -0.023 0.019 -0.022 0.019 3-11

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 3 AIRBORNE IODINE 3

(pCi/m )

LOCATIONS PERIOD ENDING 01 02 03 04 10 11 27 15C 07/09/13 -0.007 0.027 -0.007 0.025 -0.007 0.027 -0.007 0.025 -0.017 0.018 -0.020 0.021 -0.019 0.020 -0.022 0.023 07/16/13 0.011 0.031 0.010 0.029 0.011 0.031 0.010 0.029 -0.016 0.024 -0.017 0.027 -0.017 0.026 -0.016 0.025 07/23/13 -0.001 0.032 0.000 0.030 -0.001 0.032 0.000 0.029 0.014 0.030 0.016 0.034 0.015 0.032 0.014 0.031 07/30/13 0.003 0.028 0.002 0.026 0.003 0.028 0.002 0.025 -0.003 0.038 -0.003 0.042 -0.003 0.041 -0.003 0.040 08/06/13 0.026 0.033 0.024 0.030 0.026 0.033 0.023 0.029 -0.016 0.038 -0.017 0.043 -0.019 0.046 -0.016 0.039 08/13/13 -0.012 0.035 -0.011 0.033 -0.012 0.036 -0.011 0.032 0.021 0.025 0.023 0.027 0.022 0.026 0.020 0.024 08/20/13 -0.014 0.031 -0.013 0.030 -0.014 0.032 -0.013 0.028 0.007 0.024 0.007 0.026 0.007 0.026 0.007 0.025 08/27/13 -0.012 0.038 -0.011 0.034 -0.013 0.039 -0.012 0.035 -0.007 0.033 -0.008 0.036 -0.008 0.035 -0.008 0.034 09/03/13 -0.036 0.042 -0.035 0.040 -0.038 0.044 -0.034 0.040 0.020 0.037 0.023 0.041 0.022 0.040 0.021 0.039 09/10/13 -0.018 0.036 -0.027 0.038 -0.018 0.037 -0.026 0.037 -0.011 0.033 -0.012 0.035 -0.011 0.034 -0.011 0.032 09/17/13 -0.020 0.026 -0.020 0.026 -0.022 0.028 -0.019 0.024 -0.032 0.029 -0.034 0.031 -0.033 0.030 -0.032 0.029 09/24/13 0.022 0.034 0.020 0.030 0.022 0.034 0.020 0.030 0.011 0.033 0.012 0.036 0.011 0.033 0.011 0.032 10/01/13 -0.001 0.033 -0.001 0.032 -0.001 0.035 -0.001 0.031 -0.008 0.021 -0.009 0.023 -0.009 0.023 -0.008 0.022 10/08/13 -0.009 0.044 -0.009 0.041 -0.001 0.039 -0.008 0.040 -0.032 0.031 -0.036 0.034 -0.035 0.034 -0.034 0.033 10/15/13 -0.019 0.033 -0.018 0.031 -0.019 0.034 -0.017 0.030 0.010 0.028 0.011 0.031 0.011 0.030 0.011 0.029 10/22/13 -0.004 0.025 -0.004 0.025 -0.004 0.026 -0.004 0.023 0.000 0.022 0.000 0.024 0.000 0.024 0.000 0.023 10/29/13 -0.012 0.040 -0.011 0.036 -0.012 0.040 -0.011 0.036 -0.018 0.033 -0.019 0.036 -0.018 0.034 -0.018 0.033 11/05/13 -0.002 0.020 -0.002 0.020 -0.002 0.021 -0.002 0.018 0.009 0.020 0.010 0.022 0.010 0.021 0.009 0.020 11/12/13 0.006 0.033 0.005 0.027 0.006 0.034 0.005 0.030 -0.012 0.032 -0.013 0.035 -0.012 0.034 -0.012 0.032 11/19/13 -0.013 0.024 -0.016 0.029 -0.012 0.023 -0.014 0.026 -0.014 0.025 -0.015 0.027 -0.015 0.026 -0.014 0.026 11/26/13 -0.029 0.038 -0.178 0.233 -0.028 0.037 -0.032 0.042 0.038 0.030 0.041 0.034 0.040 0.032 0.039 0.031 12/03/13 -0.030 0.041 -0.034 0.045 -0.029 0.039 -0.034 0.045 -0.031 0.043 -0.034 0.047 -0.033 0.046 -0.032 0.044 12/10/13 -0.031 0.030 -0.035 0.033 -0.031 0.030 -0.035 0.033 -0.012 0.030 -0.013 0.032 -0.013 0.031 -0.012 0.030 12/17/13 -0.013 0.033 -0.014 0.036 -0.012 0.031 -0.013 0.035 0.000 0.032 0.000 0.035 0.000 0.033 0.000 0.033 12/23/13 0.000 0.011 0.000 0.012 0.000 0.011 0.000 0.012 -0.010 0.016 -0.010 0.017 -0.010 0.017 -0.010 0.016 12/30/13 -0.018 0.033 -0.020 0.037 -0.017 0.031 -0.019 0.035 -0.033 0.041 -0.035 0.044 -0.034 0.043 -0.034 0.043 3-12

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 4 AIR PARTICULATES (pCi/ma)

GAMMA SPECTRA - QTR 1 (01/02/13 -04/02/13)

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

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

1 0.1104 0.0337 0.0000 0.0015 -0.0015 0.0029 0.0009 0.0016 0.0047 0.0042 0.0008 0.0028 -0.0016 0.0060 2 0.1339 0.0453 0.0009 0.0019 -0.0008 0.0032 0.0012 0.0017 0.0036 0.0040 0.0018 0.0034 -0.0018 0.0059 3 0.0842 0.0437 -0.0010 0.0021 0.0021 0.0038 -0.0006 0.0025 -0.0018 0.0044 -0.0004 0.0037 0.0014 0.0050 4 0.0965 0.0350 -0.0010 0.0013 0.0006 0.0027 0.0005 0.0014 0.0014 0.0031 0.0008 0.0021 0.0022 0.0040 10 0.0860 0.0401 -0.0009 0.0019 0.0026 0.0030 0.0008 0.0016 0.0025 0.0040 -0.0001 0.0035 -0.0038 0.0062 11 0.0835 0.0426 -0.0015 0.0018 0.0000 0.0027 -0.0008 0.0015 0.0036 0.0038 -0.0007 0.0031 -0.0005 0.0057 27 0.0911 0.0278 -0.0003 0.0012 0.0004 0.0021 0.0000 0.0011 -0.0004 0.0023 0.0015 0.0023 -0.0032 0.0041 15C 0.1138 0.0392 0.0005 0.0011 0.0004 0.0017 0.0008 0.0010 0.0038 0.0034 0.0010 0.0020 0.0004 0.0034 LOCATION Ru-103 Ru-106 Cs-134 Cs-137 Ba-140 Ce-141 Ce-144

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

1 -0.0010 0.0040 0.0084 0.0094 0.0011 0.0014 0.0003 0.0012 -0.0008 0.2179 -0.0024 0.0058 0.0020 0.0059 2 0.0036 0.0044 -0.0087 0.0160 0.0029 0.0017 -0.0004 0.0017 -0.0142 0.2943 -0.0016 0.0081 0.0006 0.0086 3 -0.0011 0.0056 0.0069 0.0165 0.0004 0.0018 -0.0002 0.0018 -0.0509 0.3120 0.0041 0.0068 -0.0017 0.0065 4 0.0004 0.0035 0.0010 0.0135 0.0001 0.0012 0.0018 0.0012 -0.1062 0.2145 0.0001 0.0053 -0.0010 0.0058 10 0.0030 0.0054 -0.0171 0.0170 0.0021 0.0017 -0.0013 0.0013 -0.1775 0.2853 -0.0003 0.0086 0.0014 0.0093 11 -0.0019 0.0047 -0.0023 0.0164 0.0007 0.0022 0.0009 0.0016 0.0068 0.3042 0.0070 0.0080 0.0001 0.0082 27 -0.0014 0.0034 0.0066 0.0097 0.0013 0.0010 0.0004 0.0011 -0.0966 0.1983 0.0008 0.0058 -0.0019 0.0058 15C -0.0013 0.0031 0.0020 0.0113 0.0012 0.0012 0.0001 0.0011 -0.0294 0.1839 -0.0045 0.0051 -0.0031 0.0052 GAMMA SPECTRA - QTR 2 (04/02/13 -07/02/13)

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

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

1 0.1080 0.0390 0.0003 0.0010 -0.0004 0.0008 -0.0004 0.0008 -0.0003 0.0023 -0.0012 0.0027 0.0016 0.0022 2 0.1250 0.0400 0.0004 0.0010 -0.0003 0.0021 0.0000 0.0008 0.0004 0.0024 0.0007 0.0021 -0.0006 0.0037 3 0.1330 0.0410 0.0003 0.0005 0.0001 0.0012 0.0000 0.0000 -0.0020 0.0033 -0.0012 0.0027 -0.0020 0.0023 4 0.0890 0.0370 0.0006 0.0010 0.0007 0.0017 0.0002 0.0010 0.0016 0.0031 -0.0004 0.0033 -0.0006 0.0037 10 0.1660 0.0390 -0.0007 0.0007 0.0007 0.0014 -0.0003 0.0005 -0.0008 0.0018 -0.0002 0.0033 -0.0008 0.0029 11 0.1410 0.0420 0.0008 0.0012 0.0010 0.0015 0.0002 0.0010 -0.0026 0.0030 -0.0015 0.0040 0.0000 0.0024 27 0.1650 0.0410 0.0002 0.0011 0.0000 0.0013 -0.0006 0.0009 0.0005 0.0019 -0.0003 0.0031 0.0000 0.0028 15C 0.0790 0.0390 -0.0003 0.0013 0.0000 0.0000 0.0017 0.0017 -0.0005 0.0043 -0.0007 0.0014 -0.0013 0.0038 LOCATION Ru-103 Ru-106

(+1-) -- -- (+-)- -- - -Cs-134 )- -- - - - Cs-137 ) --- -----Ba-140 -----) ------ Ce-141 ------

) -- ----Ce-144-- )----

1 0.0005 0.0021 0.0017 0.0075 -0.0003 0.0008 0.0002 0.0008 0.0090 0.0170 0.0021 0.0028 -0.0020 0.0031 2 0.0009 0.0023 0.0052 0.0095 0.0002 0.0007 0.0005 .0.0008 -0.0110 0.0150 -0.0016 0.0032 0.0017 0.0040 3 -0.0005 0.0021 -0.0030 0.0120 0.0001 0.0006 -0.0010 0.0012 0.0080 0.0170 0.0005 0.0026 0.0031 0.0035 4 -0.0003 0.0024 -0.0020 0.0095 0.0005 0.0009 -0.0003 0.0010 -0.0180 0.0320 -0.0017 0.0028 -0.0001 0.0047 10 0.0018 0.0022 0.0004 0.0083 -0.0002 0.0006 -0.0007 0.0009 -0.0020 0.0430 0.0019 0.0027 -0.0003 0.0023 11 0.0001 0.0025 0.0038 0.0087 0.0001 0.0009 0.0003 0.0007 0.0000 0.0290 -0.0005 0.0030 -0.0011 0.0043 27 0.0000 0.0029 0.0010 0.0092 -0.0002 0.0007 0.0008 0.0009 0.0060 0.0110 0.0016 0.0036 -0.0014 0.0042 15C -0.0005 0.0023 -0.0054 0.0098 -0.0001 0.0006 -0.0001 0.0013 -0.0200 0.0280 0.0006 0.0022 -0.0009 0.0030 3-13

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 4 AIR PARTICULATES (pCUm')

GAMMA SPECTRA- QTR 3 (07/02/13 - 10/01/13)

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

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

(+/-) (+--)

1 0.1150 0.0388 -0.0001 0.0010 -0.0010 0.0019 -0.0001 0.0011 0.0018 0.0030 0.0003 0.0024 -0.0003 0.0035 2 0.1270 0.0452 0.0002 0.0020 0.0016 0.0034 -0.0004 0.0018 0.0031 0.0048 -0.0017 0.0038 0.0007 0.0066 3 0.1150 0.0393 -0.0008 0.0014 -0.0016 0.0025 0.0004 0.0011 0.0007 0.0031 0.0002 0.0024 -0.0018 0.0043 0.0004 0.0010 4 0.1590 0.0451 -0.0012 0.0015 0.0012 0.0026 -0.0010 0.0011 0.0012 0.0033 -0.0006 0.0031 -0.0001 0.0050 10 0.1590 0.0414 0.0002 0.0015 -0.0005 0.0029 0.0004 0.0012 0.0017 0.0041 -0.0014 0.0025 0.0002 0.0049 11 0.1600 0.0364 -0.0004 0.0012 -0.0003 0.0022 -0.0001 0.0016 0.0001 0.0024 0.0014 0.0028 0.0041 0.0043 27 0.0945 0.0296 -0.0001 0.0016 -0.0009 0.0034 0.0004 0.0013 0.0005 0.0044 0.0008 0.0027 0.0005 0.0044 15C 0.1190 0.0384 -0.0003 0.0017 -0.0006 0.0030 0.0036 0.0043 -0.0007 0.0032 0.0025 0.0052 LOCATION Ru-103

.................... Ru-106 Cs-134 Cs-137 Ba-140 Ce-141 Ce-144

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

(+/-)

1 -0.0021 0.0037 0.0076 0.0101 0.0011 0.0012 0.0004 0.0010 -0.0564 0.3240 0.0021 0.0055 0.0026 0.0070 2 0.0010 0.0052 -0.0279 0.0158 0.0023 0.0017 0.0004 0.0015 0.1110 0.4860 0.0027 0.0087 0.9029 0.9071 3 0.0039 0.0041 0.0015 0.0131 0.0012 0.0013 0.0004 0.0010 0.0774 0.4210 -0.0026 0.0068 0.0024 0.0057 4 0.0011 0.0046 -0.0036 0.0097 0.0019 0.0013 0.0005 0.0010 -0.2390 0.3910 0.0020 0.0072 0.0009 0.0056 10 0.0018 0.0046 -0.0023 0.0121 0.0016 0.0013 0.0006 0.0012 0.2670 0.4640 -0.0033 0.0069 0.0018 0.0063 11 -0.0006 0.0034 -0.0055 0.0118 -0.9008 0.0011 0.0012 0.0011 0.4410 0.3950 0.0008 0.0070 090019 090060 27 0.0027 0.0061 -0.0119 0.0157 0.0010 0.0018 -0.0002 0.0013 0.5830 0.4840 -0.0073 0.0090 -0.0002 0.0080 15C -0.0008 0.0054 -0.0057 0.0147 0.0031 0.0016 0.0004 0.0015 -0.2780 0.4000 0.0020 0.0083 -0.0040 0.0061 GAMMA SPECTRA- QTR 4 (10/01/13 - 12/30/13)

LOCATION Be-7

(+1-)

Mn-54 Co-58 Co-60 Zn-65 Nb-95 Zr-95

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

1 0.0785 0.0264 0.0000 0.0010 -0.0008 0.0017 0.0000 0.0010 0.0002 0.0028 0.0018 0.0020 -0.0032 0.0036 2 0.1100 0.0359 -0.0002 0.0017 -0.0008 0.0025 0.0004 0.0012 -0.0016 0.0027 0.0010 0.0026 -0.9009 0.0046 3 0.1090 0.0280 0.0001 0.9008 -0.006 0.0018 -0.0006 0.0012 -0.0013 0.0019 0.0006 0.0017 -0.0009 0.0028 4 0.0983 0.0324 -0.0003 0.0009 090006 0.0018 0.0005 0.0011 -0.0017 0.0025 0.0007 0.0020 0.0012 0.0038 10 0.1100 0.0305 -0.0009 0.0015 0.0000 0.0025 -0.0003 0.0015 0.0010 0.0040 -0.0020 0.0028 0.0019 0.0048 11 0.0957 0.0314 -0.0009 0.0012 -0.0007 0.0020 0.0006 0.0014 0.0033 0.0028 0.0013 0.0020 -0.0025 0.0038 27 0.0846 0.0452 0.0007 0.0016 -0.0010 0.0026 -0.0004 0.0011 0.0001 0.0038 -0.0013 0.0031 0.0017 0.0045 15C 0.0998 0.0252 -0.0003 0.0011 0.0006 0.0017 0.0005 0.0010 -0.0012 0.0023 0.0010 0.0015 -0.0025 0.0033 LOCATION Ru-1 03

(+--)

Ru-106 Cs-134 Cs-137 Ba-140

(+/-)

Ce-141 Ce-144

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

(+--)

1 -0.0009 0.0030 -0.0101 0.0088 0.0012 0.0012 -0.0003 0.0008 -0.0420 0.1350 -0.0003 0.0042 -0.0010 0.0048 2 0.0012 0.0038 0.0034 0.0131 0.0008 0.0012 0.0003 0.0014 -0.1020 0.2090 -0.0072 0.0056 -0.0041 0.0063 3 -0.0005 0.0022 0.0010 0.0061 -0.0006 0.0006 0.0005 0.0009 0.0282 0.1610 -0.0003 0.0039 0.0005 0.0041 4 -0.0008 0.0029 -0.0061 0.0083 -0.0005 0.0010 0.0002 0.0010 0.0248 0.1710 -0.0011 0.0050 0.0035 0.0051 10 0.0018 0.0039 -0.0042 0.0129 -0.0007 0.0013 -0.0001 0.0013 -0.0898 0.2380 -0.0022 0.0064 -0.0060 0.0067 11 -0.0016 0.0035 -0.0060 0.0097 0.0013 0.0013 0.0002 0.0010 -0.0184 0.1870 0.0022 0.0053 -0.0007 0.0057 27 0.0008 0.0040 0.0033 0.0115 0.9013 0.0013 -0.0007 0.0012 -0.1340 0.1890 0.0003 0.0057 0.0019 0.0066 0.0009 0.0011 -0.0127 0.1420 -0.0010 0.0044 0.0005 0.0052 15C 0.0002 0.0027 -0.0013 0.0098 -0.0002 0.0008 3-14

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 5 AIR PARTICULATES Strontium Analyses for strontium in air particulate filters were not analyzed in 2013.

See discussion in Section 4.5.

3-15

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 6 SOIL (pCi/g dry wt.)

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

(+/-) (+/-)

03 11/13/13 0.298 0.330 19.830 1.602 -0.201 0.322 -0.014 0.034 0.013 0.036 0.045 0.085 04 11/13/13 -0.066 0.321 15.500 1.356 -0.584 0.347 -0.019 0.040 -0.007 0.038 -0.001 0.076 14C 11/13/13 0.087 0.282 17.410 1.347 -0.008 0.276 0.025 0.034 0.014 0.032 -0.065 0.068 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+--)

(+/-)

03 11/13/13 0.006 0.049 -0.057 0.106 0.009 0.040 0.004 0.063 -0.005 0.037 0.007 0.330 04 11/13/13 0.028 0.043 -0.025 0.101 0.026 0.039 0.002 0.063 -0.006 0.037 -0.068 0.314 14C 11/13/13 0.019 0.042 0.050 0.085 0.026 0.040 -0.001 0.061 0.006 0.032 0.246 0.285 COLLECTION LOCATION DATE Sb-125 Cs-134 Cs-137 Ce-141 Ce-144 Ac-228

(+0-)

03 11/13/13 0.016 0.098 0.012 0.036 0.183 0.077 0.048 0.058 0.049 0.245 1.174 0.319 04 11/13/13 0.030 0.096 -0.032 0.041 0.537 0.080 0.027 0.057 -0.198 0.222 0.257 0.335 14C 11/13/13 0.041 0.083 0.016 0.031 0.101 0.049 0.001 0.052 -0.025 0.196 1.356 0.273 3-16

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 7 COW MILK (pCi/I)

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

(+/-)

22 01/24/13 -0.761 0.417 1180 123 1.3 3.4 0.4 3.4 -1.6 24.5 5.8 7.8 02/21/13 -0.184 0.315 1220 152 -1.8 4.2 -4.5 3.7 11.9 17.2 -0.5 5.9 03/13/13 0.436 0.483 1.1 5.1 1.0 0.9 1380 148 -1.6 3.9 3.9 4.6 0.8 19.5 -0.6 5.2 04/24/13 -0.262 0.227 1356 135 -2.1 3.0 1.7 3.3 24.1 20.3 -3.1 5.7 05/15/13 -0.217 0.387 1372 97.5 -3.7 2.5 1.0 2.7 -18.7 16.6 -0.9 5.2 05/30/13 0.049 0.583 1360 148 -1.7 4.1 0.3 3.6 -0.8 16.9 3.8 5.5 06/13/13 0.096 0.362 1418 133 -0.9 4.0 3.4 4.0 -2.5 16.8 -2.2 4.5 06/19/13 0.238 0.397 3.3 5.4 -0.3 1.0 1255 163 -4.5 4.2 1.5 4.8 6.8 17.0 -3.7 4.4 07/11/13 -0.017 0.262 1216 175 -1.6 5.0 2.0 4.6 -3.1 23.7 -2.4 6.5 07/24/13 0.141 0.362 1203 121 0.0 3.0 -0.3 3.3 -13.5 26.3 -2.7 6.2 08/07/13 -0.278 0.403 1212 125 0.9 3.8 -2.8 3.8 -9.4 19.4 -4.0 4.8 08/21/13 0.104 0.360 1485 162 -3.4 3.7 1.2 3.8 13.8 20.0 2.1 5.6 09/03/13 0.185 0.407 1356 166 0.8 5.9 -0.2 4.9 16.6 27.1 -0.2 6.3 09/19/13 -0.076 0.300 3.6 5.1 0.5 0.4 1268 156 -0.8 4.0 -0.8 3.8 -4.7 17.1 0.8 5.3 10/02/13 -0.042 0.421 1288 134 -1.0 3.3 0.4 3.5 5.0 21.3 -3.1 6.3 10/22/13 0.033 0.373 1375 161 -0.8 4.4 1.3 3.7 7.9 24.1 -0.5 6.3 11/20/13 -0.143 0.441 1348 128 0.9 3.7 0.0 3.5 4.2 23.4 0.5 5.3 12/11/13 -0.248 0.363 0.8 7.4 0.5 0.8 1285 180 -4.3 5.2 -0.7 5.4 6.3 24.3 3.5 8.4 3-17

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 8 GOAT MILK Goat Milk samples were not available during 2013.

See discussions in Sections 2.3 and 4.5 3-18

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 9 PASTURE GRASS / HAY (pli/g wet wt.)

Location 21 COLLECTION DATE Be-7 K-40 Cr-Si Mn-54 Co-58 Fe-59 Co-60 01/24/13 0.016 0.092 17.6 0.6 -0.029 0.105 -0.004 0.011 -0.005 0.012 -0.007 0.030 -0.010 0.015 02121113 0.063 0.089 11.8 0.6 -0.030 0.091 0.005 0.011 0.006 0.011 0.030 0.027 -0.011 0.015 03/13/13 0.062 0.104 14.1 0.7 -0.033 0.104 0.000 0.013 0.008 0.013 -0.038 0.032 0.014 0.019 04/24/13 0.084 0.076 15.1 0.3 -0.001 0.069 0.003 0.006 0.001 0.007 0.002 0.017 0.001 0.008 05/16/13 0.148 0.057 5.2 0.2 -0.002 0.042 0.000 0.004 -0.001 0.004 -0.005 0.012 -0.004 0.005 05/30/13 0.510 0.1-65 5.0 0.5 -0.007 0.112 -0.008 0.012 -0.004 0.011 0.009 0.028 -0.005 0.016 06/13/13 0.910 0.166 6.4 0.5 -0.020 0.083 -0.008 0.011 -0.007 0.010 0.025 0.023 -0.007 0.013 06/19/13 0.921 0.222 3.4 0.5 0.006 0.127 -0.001 0.015 0.002 0.014 -0.007 0.032 0.007 0.017 07/11/13 0.638 0.277 9.7 0.9 -0.048 0.170 0.005 0.019 0.005 0.018 0.001 0.042 -0.018 0.026 07/24/13 1.150 0.208 4.9 0.4 -0.015 0.099 0.001 0.011 -0.007 0.011 0.005 0.021 0.003 0.015 08/07/13 0.406 0.088 8.3 0.3 -0.003 0.055 0.000 0.006 -0.005 0.006 0.007 0.017 0.005 0.008 08/21/13 1.369 0.288 10.6 0.8 0.103 0.160 0.005 0.017 0.011 0.016 -0.016 0.041 0.017 0.022 09/03/13 1.581 0.302 5.9 0.7 0.095 0.159 -0.002 0.020 -0.009 0.020 0.008 0.049 0.004 0.028 09/19/13 1.601 0.199 6.6 0.4 -0.086 0.098 -0.002 0.010 0.002 0.010 0.004 0.025 -0.008 0.012 10/02/13 0.817 0.167 8.4 0.5 0.006 0.115 -0.001 0.010 -0.003 0.011 0.011 0.028 0.007 0.014 10/22/13 1.248 0.104 7.0 0.2 -0.007 0.056 0.002 0.005 0.002 0.005 -0.001 0.013 -0.002 0.006 11/20/13 0.012 0.048 10.9 0.3 0.012 0.054 0.002 0.006 0.000 0.006 -0.002 0.017 -0.006 0.009 12/11/13 0.240 0.209 12.2 0.7 -0.131 0.151 0.006 0.016 -0.013 0.020 0.008 0.038 0.012 0.021 COLLECTION DATE Zn-65 N-5Z-5R-0 u16S-2 -3

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

01/24/13 0.007 0.033 0.010 0.012 -0.001 0.020 0.001 0.012 -0.016 0.092 0.000 0.027 0.014 0.034 02/21/13 -0.053 0.028 0.008 0.012 -0.007 0.020 -0.001 0.011 -0.037 0.095 0.016 0.030 -0.015 0.016 03/13/13 -0.045 0.034 0.002 0.013 0.003 0.022 0.004 0.013 0.002 0.118 0.001 0.032 0.006 0.021 04/24/13 -0.033 0.018 0.007 0.007 0.011 0.012 0.004 0.007 0.037 0.054 0.001 0.016 -0.013 0.021 05/16/13 -0.010 0.011 0.003 0.004 0.003 0.008 -0.002 0.005 0.006 0.037 -0.002 0.010 -0.010 0.014 05/30/13 -0.032 0.033 0.002 0.013 0.025 0.023 -0.012 0.011 0.062 0.115 0.020 0.033 -0.017 0.022 06/13/13 -0.012 0.024 0.003 0.009 0.015 0.017 0.008 0.009 0.033 0.086 -0.018 0.025 -0.007 0.014 06/19/13 -0.004 0.028 -0.011 0.014 0.006 0.026 -0.004 0.015 -0.032 0.139 0.006 0.036 0.020 0.023 07/11/13 -0.016 0.044 -0.005 0.017 0.027 0.031 0.001 0.018 0.026 0.140 -0.008 0.049 -0.001 0.031 07/24/13 -0.039 0.030 0.010 0.011 0.009 0.019 0.001 0.011 0.064 0.088 -0.003 0.027 0.008 0.018 08/07/13 -0.023 0.017 0.007 0.006 0.005 0.011 0.003 0.006 0.023 0.052 0.001 0.014 0.014 0.018 08/21/13 -0.015 0.046 0.009 0.017 0.004 0.035 -0.013 0.017 0.021 0.154 0.010 0.044 -0.008 0.033 09/03/13 -0.040 0.065 0.025 0.019 0.004 0.035 0.000 0.019 0.030 0.164 0.018 0.050 0.013 0.030 09/19/13 -0.011 0.027 0.003 0.010 -0.002 0.017 -0.010 0.011 -0.055 0.085 0.003 0.025 0.005 0.025 10/02/13 0.008 0.028 0.001 0.011 0.008 0.022 0.000 0.013 -0.015 0.099 -0.005 0.029 -0.037 0.036 10/22/13 0.005 0.013 0.005 0.005 -0.005 0.009 -0.009 0.006 -0.005 0.043 -0.001 0.012 0.003 0.021 11/20/13 0.015 0.017 0.002 0.006 0.000 0.011 0.006 0.006 -0.040 0.048 -0.014 0.013 -0.003 0.019 12/11/13 0.040 0.045 0.013 0.021 0.015 0.032 -0.012 0.020 0.058 0.148 0.014 0.044 0.018 0.032 3-19

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 9 PASTURE GRASS / HAY (pCi/g wet wt.)

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

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

01124/13 0.011 0.011 0.009 0.011 -0.049 0.076 -0.002 0.019 -0.009 0.020 -0.024 0.067 0.020 0.042 02/21/13 -0.002 0.012 0.009 0.011 -0.031 0.044 0.009 0.012 0.007 0.015 0.040 0.065 0.042 0.047 03/13/13 -0.007 0.013 0.008 0.011 0.030 0.060 -0.002 0.015 0.004 0.019 -0.017 0.076 -0.019 0.051 04/24/13 -0.002 0.007 0.017 0.007 0.018 0.047 -0.007 0.011 0.000 0.014 -0.046 0.042 0.013 0.032 05/16/13 -0.006 0.004 -0.001 0.004 0.000 0.030 0.000 0.008 -0.008 0.008 -0.014 0.025 0.038 0.025 05/30/13 0.004 0.013 -0.001 0.013 0.025 0.059 0.005 0.015 0.005 0.020 0.030 0.078 0.031 0.049 06/13/13 0.007 0.010 0.007 0.009 -0.015 0.039 -0.009 0.013 0.011 0.016 0.006 0.060 -0.003 0.042 06119/13 -0.004 0.015 0.007 0.015 0.021 0.067 -0.003 0.021 -0.001 0.022 0.013 0.086 -0.019 0.057 07/11/14 -0.008 0.017 0.016 0.021 0.033 0.080 0.009 0.021 -0.017 0.028 -0.038 0.120 -0.029 0.071 07/24/13 0.003 0.009 0.014 0.012 0.014 0.052 -0.001 0.014 -0.002 0.017 -0.009 0.064 0.055 0.042 08/07/13 0.001 0.006 0.003 0.006 -0.005 0.041 -0.004 0.012 0.008 0.008 0.028 0.025 0.053 0.039 08/21/13 0.001 0.019 0.017 0.019 -0.082 0.082 0.009 0.017 0.013 0.027 0.054 0.108 0.025 0.067 09/03/13 -0.001 0.022 0.004 0.021 -0.022 0.093 -0.014 0.029 0.006 0.021 0.081 0.081 0.032 0.080 09/19/13 0.003 0.010 0.005 0.010 0.008 0.061 -0.009 0.016 0.001" 0.016 0.025 0.055 -0.009 0.038 10/02/13 -0.021 0.011 0.015 0.011 0.010 0.081 0.002 0.021 0.019 0.023 -0.046 0.074 0.010 0.042 10/22/13 -0.006 0.005 0.003 0.005 -0.012 0.041 -0.001 0.011 -0.002 0.010 -0.012 0.032 0.006 0.030 11/20/13 -0.002 0.006 0.006 0.006 -0.022 0.043 0.003 0.012 -0.003 0.009 -0.017 0.028 0.007 0.033 12/11/13 0.065 0.020 0.004 0.016 0.012 0.087 -0.012 0.022 0.016 0.029 0.012 0.107 0.004 0.057 Note: Pasture grass is required as a substitute for milk when milk is not available. Grass was only available during the months of May thru September. During other months feed was substituted for pasture grass.

3-20

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 9 PASTURE GRASS / HAY (pCi/g wet wt.)

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

(+/-) (+1-)

01/24/13 0.075 0.119 14.4 0.6 0.088 0.131 0.003 0.013 0.000 0.016 -0.011 0.036 0.003 0.019 02/21/13 -0.093 0.125 10.1 0.8 -0.027 0.109 0.018 0.016 -0.007 0.016 -0.004 0.035 0.005 0.021 03/13/13 -0.011 0.101 11.1 0.6 0.071 0.101 0.001 0.013 0.001 0.013 -0.039 0.031 -0.005 0.019 04/24/13 -0.001 0.149 11.3 0.8 -0.049 0.151 -0.010 0.017 0.008 0.018 -0.004 0.047 -0.007 0.026 05/15113 0.198 0.060 5.8 0.2 0.027 0.039 -0.001 0.003 0.001 0.004 0.004 0.010 -0.002 0.005 05/30/13 0.333 0.210 4.1 0.4 -0.054 0.096 0.001 0.010 -0.018 0.010 0.005 0.019 -0.004 0.012 06/13/13 0.501 0.148 3.3 0.3 -0.011 0.076 0.004 0.008 -0.001 0.010 -0.002 0.018 -0.004 0.012 06/19/13 0.523 0.228 3.4 0.5 -0.025 0.130 -0.003 0.015 0.001 0.014 0.001 0.031 0.015 0.018 07/11/13 0.810 0.231 3.7 0.6 0.068 0.134 0.007 0.014 -0.008 0.015 -0.017 0.037 -0.007 0.017 07/24/13 0.693 0.179 7:0 0.5 0.054 0.119 -0.003 0.011 0.008 0.011 0.014 0.025 0.003 0.014 08/07/13 1.188 0.081 6.2 0.2 -0.024 0.042 0.005 0.004 -0.001 0.004 0.005 0.012 0.005 0.006 08/21/13 0.624 0.208 5.8 0.6 0.068 0.115 -0.007 0.016 0.000 0.015 0.005 0.033 -0.001 0.019 09/03/13 1.141 0.214 5.1 0.5 -0.042 0.121 -0.003 0.013 -0.005 0.011 0.015 0.026 0.000 0.016 09/19/13 0.771 0.104 6.2 0.3 -0.048 0.062 -0.002 0.006 -0.003 0.007 0.010 0.016 0.003 0.009 10/02/13 0.546 0.213 6.7 0.5 0.067 0.107 -0.010 0.011 -0.013 0.012 0.OO0 0.030 0.006 0.015 10/22/13 0.631 0.057 5.6 0.2 -0.041 0.035 -0.002 0.003 0.002 0.003 0.015 0.010 -0.001 0.004 11/20/13 0.069 0.056 10.5 0.3 0.005 0.063 -0.001 0.006 0.002 0.007 0.004 0.016 0.003 0.008 12/11/13 -0.048 0.157 10.2 0.8 0.035 0.132 -0.012 0.017 -0.003 0.016 0.025 0.040 -0.011 0.022

__________Zn-65 Nb-95(+--) Zr-95 Ru-103 Ru-106 Sb-125 1-131

-- (+1--

- )--- (+/-)

01/24/13 -0.053 0.038 0.004 0.015 0.001 0.026 -0.009 0.016 -0.072 0.122 0.017 0.032 -0.045 0.038 02/21/13 -0.004 0.039 -0.005 0.016 -0.008 0.028 -0.007 0.014 0.125 0.122 0.016 0.037 0.000 0.018 03/13/13 -0.005 0.032 -0.006 0.012 -0.005 0.021 0.004 0.012 0.087 0.105 -0.003 0.029 0.000 0.018 04/24/13 -0.056 0.049 0.007 0.020 -0.010 0.034 -0.004 0.018 0.197 0.151 -0.016 0.041 -0.019 0.035 05/15/13 -0.008 0.010 -0.003 0.004 -0.001 0.007 -0.003 0.004 0.004 0.030 -0.001 0.008 -0.012 0.013 05/30/13 -0.003 0.027 0.000 0.011 0.004 0.019 0.005 0.011 -0.048 0.084 -0.013 0.030 0.011 0.019 06/13/13 -0.011 0.020 0.011 0.009 -0.005 0.016 -0.002 0.008 0.002 0.074 -0.001 0.023 -0.010 0.013 06/19/13 -0.006 0.035 0.017 0.017 -0.014 0.025 0.003 0.016 0.056 0.132 -0.017 0.041 -0.006 0.027 07/11/13 -0.036 0.029 0.001 0.013 0.019 0.026 0.009 0.016 0.050 0.114 -0.005 0.041 0.021 0.027 07/24/13 -0.015 0.027 0.004 0.011 0.002 0.019 -0.003 0.013 0.036 0.094 0.014 0.033 -0.015 0.025 08/07/13 -0.009 0.011 0.001 0.005 0.007 0.007 -0.006 0.005 0.003 0.037 0.004 0.010 0.002 0.013 08/21/13 -0.007 0.038 -0.002 0.015 0.010 0.025 -0.011 0.014 0.066 0.125 -0.005 0.037 -0.008 0.024 09/03/13 0.012 0.033 0.005 0.013 -0.006 0.023 -0.004 0.011 -0.009 0.110 -0.013 0.033 0.010 0.019 09/19/13 0.006 0.017 0.005 0.007 0.000 0.012 0.001 0.007 0.029 0.057 0.001 0.016 0.006 0.018 10/02/13 -0.024 0.031 0.001 0.013 -0.012 0.021 -0.009 0.013 0.021 0.100 0.011 0.029 -0.022 0.037 10/22/13 -0.014 0.009 -0.001 0.004 0.000 0.006 -0.001 0.004 -0.024 0.027 0.004 0.008 0.006 0.014 11/20/13 0.001 0.016 0.011 0.007 -0.006 0.012 0.002 0.007 -0.034 0.053 0.005 0.015 -0.009 0.021 12/11/13 -0.031 0.048 0.014 0.016 0.004 0.026 0.002 0.016 -0.061 0.145 -0.017 0.044 0.022 0.032 3-21

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 9 PASTURE GRASS / HAY (pCi/g wet wt.)

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

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

(+1-)

01/24/13 -0.004 0.014 0.012 0.014 0.011 0.094 0.013 0.026 0.000 0.020 -0.022 0.064 0.006 0.055 02/21/13 -0.017 0.014 0.011 0.016 0.012 0.058 -0.011 0.020 0.001 0.015 -0.049 0.064 0.000 0.066 03/13/13 -0.003 0.012 -0.004 0.013 -0.003 0.055 0.001 0.015 0.006 0.017 -0.013 0.069 -0.012 0.051 04/24/13 -0.008 0.019 0.007 0.019 -0.054 0.106 0.013 0.029 -0.006 0.020 -0.041 0.067 -0.043 0.070 05/15/13 0.002 0.003 0.004 0.003 -0.020 0.025 -0.003 0.007 -0.001 0.007 -0.029 0.021 0.018 0.016 05/30/13 -0.003 0.011 -0.002 0.012 -0.009 0.050 -0.001 0.012 0.000 0.019 -0.019 0.074 -0.015 0.037 06/13113 -0.008 0.009 -0.003 0.009 0.009 0.034 0.002 0.010 0.006 0.015 -0.009 0.059 0.039 0.035 06/19/13 0.011 0.018 -0.004 0.017 -0.006 0.072 -0.022 0.018 0.001 0.025 -0.048 0.092 -0.046 0.059 07/11/13 -0.003 0.014 -0.002 0.016 0.000 0.066 0.000 0.015 -0.019 0.027 0.037 0.099 0.039 0.060 07/24/13 0.008 0.012 0.003 0.012 0.029 0.062 -0.002 0.009 -0.004 0.024 -0.075 0.097 0.060 0.046 08/07/13 0.002 0.004 0.000 0.004 -0.026 0.030 -0,006 0.008 0.001 0.007 0.005 0.023 0.008 0.019 08/21/13 -0.009 0.016 0.004 0.015 0.030 0.065 -0.006 0.022 -0.005 0.018 -0.042 0.070 0.068 0.056 09/03/13 0.008 0.011 0.003 0.013 -0.018 0.056 0.007 0.018 -0.007 0.019 0.026 0.073 0.064 0.055 09/19/13 0.000 0.007 0.003 0.007 -0.023 0.041 0.003 0.010 -0.005 0.012 -0.026 0.042 0.009 0.044 10/02/13 -0.013 0.012 -0.002 0.011 0.023 0.080 -0.019 0.024 -0.001 0.017 -0.025 0.055 -0.008 0.045 10/22/13 -0.004 0.003 0.000 0.003 -0.017 0.028 -0.001 0.007 -0.006 0.006 -0.002 0.020 0.010 0.015 11/20/13 0.004 0.007 0.003 0.007 0.003 0.046 -0.003 0.012 -0.002 0.012 -0.007 0.034 0.010 0.032 12/11/13 0.002 0.018 0.004 0.017 -0.066 0.086 0.004 0.025 0.022 0.023 0.030 0.096 -0.011 0.071 Note: Pasture grass is required as a substitute for milk when milk is not available. Grass was only available during the months of May thru September. During other months feed was substituted for pasture grass.

3-22

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 10 WELL WATER (pCi/I)

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

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

71 03127/13 26 495 5.6 22.3 16.1 48.9 -14.2 23.5 0.6 2.4 -0.7 2.7 1.9 4.6 -0.2 2.2 06/10/13 479 1010 -13.7 33.8 12.3 64.6 22.5 39.2 0.2 4.5 1.1 4.0 8.1 9.5 -4.3 4.3 09/24/13 -183 506 -1.4 26.3 20.4 37.9 8.0 34.3 1.1 2.8 1.2 2.9 2.0 6.9 -1.3 3.1 12/14/13 213 537 6.4 9.1 5.4 17.4 -3.0 11.6 0.0 0.8 -0.7 0.9 -0.1 2.1 -0.4 0.8 72 03/26/13 135 505 -7.6 20.6 5.0 41.8 -5.6 22.3 -1.1 -1.3 2.9 5.3 -0.3 2.5 06/10/13 -419 894 -17.0 37.3 -37.0 65.3 -59.2 39.0 -1.7 3.2 0.2 7.3 0.8 4.2 09/24/13 78 528 -8.6 24.7 38.2 48.7 -5.1 32.1 -6.0 -2.1 2.0 6.1 -0.4 2.6 12/13/13 87 530 3.1 11.8 -25.8 20.7 -13.3 15.2 -0.9 -0.3 1.3 2.9 0.3 1.1 76 03/20/13 -104 493 15.6 21.1 - -14.7 33.3 2.2 22.1 1.7 -0.3 -3.4 4.8 -1.4 2.4 06/06/13 143 524 -4.0 36.7 85.8 92.4 -18.7 44.5 -2.5 1.3 9.5 9.2 2.0 4.8 09/19/13 -161 533 -0.5 23.8 29.5 65.9 -17.5 26.2 1.8 -0.4 2.8 6.0 -0.2 2.8 12/11/13 236 523 -3.3 26.9 58.5 64.7 -14.3 29.8 2.0 0.8 3.6 6.9 -2.6 3.3 77 03/18/13 137 515 7.9 25.3 -10.8 38.9 -0.2 31.6 -1.9 -2.1 -3.6 5.1 0.8 2.6 06/06/13 84 514 26.6 42.3 22.6 69.7 -3.8 44.7 -1.8 -4.9 -2.6 10.0 0.6 4.1 09/19/13 -296 521 -21.8 28.5 14.0 61.0 -21.0 34.0 -2.9 -4.2 -3.2 6.0 -0.3 2.8 12/11/13 -71 499 -41.8 32.2 -39.5 54.3 25.0 39.9 -0.2 -2.5 1.4 8.4 -1.1 3.5 78 03/18/13 104 511 29.4 22.1 16.2 36.8 -9.9 23.4 0.9 1.8 2.7 5.1 -0.4 2.6 06/06/13 544 1270 4.3 31.8 -18.6 50.1 -15.4 31.5 -1.6 1.4 -2.3 8.7 -3.1 3.6 09/17/13 211 574 7.5 20.2 50.1 52.7 -12.9 22.9 0.3 -1.3 1.6 5.6 -1.4 2.7 12/12/13 -26 502 -9.4 31.5 26.6 57.1 13.5 37.3 0.0 -3.1 6.5 7.6 -0.6 3.6 79 03/27/2013 -185 475 4.0 18.2 64.2 44.3 17.7 22.0 -3.1 0.2 -1.4 4.4 -0.5 2.1 06/10/2013 -353 903 -12.7 29.9 10.5 55.7 9.5 33.5 -2.1 0.5 -4.4 7.4 -0.5 3.6 09/23/13 -78 515 -0.8 20.8 13.1 43.4 29.0 27.9 -0.1 1.9 1.5 5.5 -0.8 2.5 12/13/13 -13 516 6.9 12.0 3.7 21.3 1.3 15.8 0.3 0.1 0.3 3.0 0.2 1.2 80 03/27/13 1110 612 -8.8 25.1 -27.3 36.2 -0.6 26.7 0.5 -4.3 -3.3 5.2 1.1 2.6 81 03/27/13 572 542 -13.4 19.3 31.4 37.4 -0.5 21.4 -0.8 -1.8 0.1 4.1 -0.9 2.2 06/10/13 -255 918 18.8 38.7 14.4 66.7 -1.6 44.7 -2.1 -5.4 -1.0 7.5 -1.1 3.5 09/25/13 241 479 -3.1 25.7 27.5 63.2 -1.0 29.5 -1.3 1.5 0.3 5.6 0.2 2.4 12/14/13 689 872 7.5 13.5 -28.9 23.8 -7.5 16.3 0.1 -1.3 5.7 3.4 -1.1 1.3 82 03/27/13 238 515 23.0 27.9 34.2 50.6 10.6 32.4 -3.0 1.5 1.1 6.4 0.1 2.8 06/10/13 453 975 -30.6 33.2 75.0 89.8 11.0 37.4 -0.6 -2.0 2.3 7.9 -2.2 3.7 09/24/13 -110 508 18.4 26.5 24.4 55.0 36.9 33.6 0.2 1.1 8.5 6.3 -1.1 3.1 12)14/13 524 560 0.1 11.7 -6.9 19.8 -6.7 14.9 -0.5 -1.1 -0.6 2.8 -0.8 1.2 83 12/14/13 352 548 12.8 11.9 15.4 24.7 -1.3 17.0 -1.0 1.1 0.7 1.2 -1.5 2.9 -0.7 1.1 3-23

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 10 WELL WATER (pCi/1)

COLLECTION LOCATION DATE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 Cs-134 71 03/27/13 1.2 5.4 2.4 3.1 1.3 4.3 -1.8 2.8 -19.5 21.8 -4.5 7.3 0.2 3.8 -0.1 2.6 06/10/13 -6.5 10.4 5.6 4.7 -2.3 7.0 -1.7 4.1 -2.2 30.8 -19.9 11.4 -3.6 8.2 -0.1 4.9 09/24/13 -9.4 7.0 -0.1 3.0 4.9 5.5 -0.5 3.5 -14.5 26.1 -4.4 7.8 -7.6 9.2 -1.7 3.4 12/14/13 -3.7 2.1 0.0 1.0 -0.1 1.6 0.3 1.4 0.8 7.5 0.4 2.3 -0.7 5.4 -5.7 0.9 72 03/26/13 -2.6 6.2 -0.5 2.7 -1.1 4.3 -1.7 2.5 11.2 23.1 2.7 6.7 2.7 3.8 0.9 2.6 06/10/13 8.4 10.8 -0.1 4.9 -0.5 8.1 -1.5 4.5 -5.0 36.6 2.6 10.8 2.8 7.6 0.1 4.1 09/24/13 -7.5 6.9 -0.9 3.0 -1.4 5.6 -2.0 3.5 -12.1 23.4 -0.6 7.9 0.8 9.1 -7.9 3.5 12/13/13 -9.0 2.7 -0.4 1.3 0.5 2.2 -1.4 1.6 8.1 9.9 2.8 3.1 1.2 8.1 -4.9 1.3 76 03/20/13 -3.7 6.0 -0.2 2.6 -3.8 4.2 -0.9 2.5 13.8 20.5 0.4 6.9 -1.7 3.9 -1.2 2.7 06/06/13 11.0 10.4 2.8 4.2 3.6 8.4 -0.6 4.4 22.5 38.8 -4.8 13.2 4.8 5.9 -3.9 5.4 09/19/13 -2.7 7.1 -0.9 2.8 3.4 4.7 -0.5 3.0 7.6 23.3 -3.5 7.7 2.0 4.1 -1.1 2.9 12/11/13 -20.8 8.9 2.5 3.4 -1.3 5.9 -1.2 3.5 -35.0 30.7 -3.2 8.5 -6.5 5.7 0.4 3.7 77 03/18/13 2.0 6.2 8.9 3.4 -3.5 5.2 0.6 3.2 3.1 25.1 -0.8 8.9 3.0 5.5 1.4 3.2 06/06/13 7.3 12.5 12.6 5.7 5.2 7.3 0.9 4.7 -3.2 39.4 6.4 13.0 1.1 6.6 7.3 4.7 09/19/13 0.8 7.2 7.8 4.0 1.2 5.5 -4.2 3.5 5.8 30.8 -2.8 9.8 -5.6 5.8 2.0 3.7 12/11/13 6.9 8.1 6.1 4.8 2.8 7.3 -0.4 4.2 -24.4 36.0 2.9 11.1 -2.0 7.6 1.2 3.9 78 03/18/13 0.2 5.7 3.0 2.6 -0.6 4.2 -1.0 2.7 10.9 22.2 -3.7 7.0 3.5 4.3 2.8 3.1 06/06/13 -7.4 10.0 1.4 4.1 -3.4 6.3 0.1 3.8 -1.4 29.2 4.1 10.6 3.8 4.7 -2.4 3.9 09/17/13 5.0 5.5 1.4 2.8 -2.3 3.9 1.0 2.8 17.1 21.0 0.4 6.7 -0.3 4.8 -2.0 2.9 12/12/13 5.7 8.9 5.0 4.1 4.2 6.0 5.7 4.0 -7.1 31.9 -2.2 10.6 -1.6 6.2 -3.9 4.7 79 03/27/13 3.5 4.9 0.6 2.2 1.7 3.8 -0.6 2.4 1.4 18.9 -2.0 6.2 -1.1 3.3 -0.1 2.4 06/10/13 3.8 6.9 3.8 3.5 2.8 5.6 -1.2 3.5 -21.6 26.0 -0.4 9.4 -5.1 6.9 -1.1 3.4 09/23/13 0.5 4.8 2.6 2.7 -1.6 4.6 -4.7 3.0 3.0 19.9 4.0 6.3 -2.7 8.1 -1.7 4.4 12/13/13 -3.9 2.6 1.2 1.3 2.2 2.3 -2.0 1.6 2.2 10.4 -0.6 2.9 -1.9 7.7 -4.3 1.1 80 03/27/13 0.8 5.7 4.0 3.4 -1.8 4.7 0.4 2.9 -2.3 23.5 -5.2 8.1 -1.0 4.3 -1.4 3.0 81 03/27/13 2.3 5.1 1.6 2.4 0.0 3.8 -2.6 2.3 -18.7 17.3 1.9 6.5 0.6 3.6 0.0 2.2 06/10/13 -0.3 9.1 4.0 4.3 4.2 7.4 3.4 4.7 -5.6 35.9 1.8 12.9 -1.3 10.0 -1.0 4.7 09/25/13 -3.7 5.9 0.9 2.7 5.8 4.9 -2.5 3.1 9.5 22.4 4.0 7.6 -2.4 7.6 0.3 2.7 12/14/13 -7.6 3.0 0.9 1.5 0.2 2.8 -0.9 1.8 -5.7 12.3 -1.7 3.5 4.5 8.2 -6.0 1.4 82 03/27/13 3.1 6.9 14.7 4.1 -0.3 5.4 -1.5 3.3 -9.4 26.5 -1.0 9.6 -0.1 5.2 1.0 3.3 06/10/13 2.7 7.9 3.1 4.9 -0.9 6.9 -1.6 4.2 -0.1 34.3 -7.6 11.7 0.1 7.3 -0.1 4.0 09/24/13 -1.8 6.5 6.2 3.6 1.8 5.4 -1.3 3.5 -9.0 25.1 -4.3 7.9 -5.4 8.6 0.6 3.2 12/14/13 1.1 2.7 1.4 1.3 1.9 2.2 1.2 1.8 -3.7 10.3 1.1 3.1 -1.4 7.4 -1.1 1.3 83 12/14/13 0.1 2.7 0.1 1.3 0.2 2.3 -0.4 1.9 -7.5 10.4 -4.3 3.1 0.6 8.0 -1.7 1.3 3-24

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 10 WELL WATER (pCi/I)

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

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

71 03127/13 -2.5 2.8 -6.2 10.8 -1.5 3.7 4.6 9.5 06/10/13 0.5 4.3 2.6 20.0 0.2 6.8 5.0 15.9 09/24/13 0.1 2.8 6.5 19.9 2.8 6.6 -1.2 10.3 12/14/13 0.1 0.8 -4.0 9.3 -0.4 3.1 0.7 4.4 72 03/26/13 -2.1 2.7 -2.5 11.4 -1.0 4.1 8.6 10.2 06/10/13 1.5 4.3 12.8 20.7 0.0 6.9 1.3 16.8 09/24/13 0.4 3.0 11.3 19.2 1.4 6.4 2.7 9.7 12/13/13 -0.7 1.1 5.4 13.1 1.5 4.1 0.6 4.9 76 03/20/13 -1.5 2.7 2.4 10.6 0.8 4.2 2.3 9.0 06/06/13 1.2 4.6 5.2 18.9 -2.7 6.7 7.8 18.6 09/19/13 -0.5 2.6 -11.2 13.1 1.9 3.9 -2.0 10.3 12/11/13 1.1 3.4 -0.5 16.5 -0.4 5.4 -4.3 13.3 77 03/18/13 -4.0 3.2 14.2 14.5 -0.2 3.5 -10.1 11.0 06/06/13 -5.4 4.5 14.2 18.8 3.3 6.4 -2.8 15.7 09/19/13 -2.9 3.4 -11.2 14.8 1.7 4.6 0.3 11.9 12/11/13 -2.4 4.3 3.8 19.4 1.1 6.0 -8.6 14.2 78 03/18/13 1.2 2.6 0.1 12.0 -1.0 3.8 -3.5 9.3 06/06/13 2.4 3.8 -3.7 12.2 -2.4 3.5 -0.6 12.1 09/17/13 -2.6 2.7 1.5 13.4 -0.4 4.2 -2.7 10.4 12/12/13 -1.3 3.9 -19.9 16.1 1.0 5.2 -8.3 13.7 79 03/27/13 -0.8 2.4 -2.8 9.3 1.3 3.0 -4.2 9.0 06/10/13 -1.7 3.5 -3.6 17.8 -4.9 6.0 10.1 14.2 09/23/13 1.7 2.5 8.7 17.8 5.3 5.9 -1.6 8.9 12/13/13 0.7 1.2 8.5 13.0 -1.7 4.5 1.2 5.6 80 03/27/13 -0.5 2.9 -6.4 12.3 2.8 4.2 -7.8 9.4 81 03/27/13 -1.4 2.4 10.9 10.1 -0.6 3.3 -4.6 8.5 06/10/13 -6.1 4.3 -14.5 21.2 -1.3 6.9 14.0 14.1 09/25/13 -1.9 2.4 -19.4 16.4 -3.4 5.3 -5.4 9.6 12/14/13 0.4 1.3 9.2 14.8 -1.4 4.7 0.3 7.5 82 03/27/13 -0.6 3.6 -8.5 13.7 -2.3 4.4 -7.6 12.0 06/10/13 0.3 4.3 -0.2 20.4 5.0 7.3 16.5 18.1 09/24/13 1.9 3.0 -15.4 19.8 0.2 6.9 27.5 20.1 12/14/13 -0.4 1.1 0.3 12.8 -1.0 4.2 3.2 8.4 83 12/14/13 0.9 1.2 -9.0 12.8 0.0 4.0 -1.0 5.1 3-25

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 11 RESERVOIR WATER (pCi/ 1)

Reservoir water was not sampled in 2013. See discussion in Section 4.11.

3-26

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 12 FRUITS & VEGETABLES (pCi/g wet wt.)

LOCATION 25 COLLECTION DATE Type .- Be-7 K-40 Cr-51 Mn-54 .m Co-58 .w. Fe-59 Co-60 P+-)

07/29/13 Greens 0.076 0.034 4.315 0.168 -0.010 0.035 -0.002 0.003 0.001 0.004 0.006 0.009 -0.004 0.005 07/29/13 Blueberries 0.039 0.028 0.604 0.076 -0.007 0.026 0.000 0.003 -0.003 0.003 -0.001 0.005 0.000 0.003 10/29/13 Squash -0.006 0.033 2.288 0.122 0.015 0.038 -0.001 0.004 -0.001 0.004 -0.001 0.009 0.002 0.004 10/29/13 Apples 0.000 0.028 0.604 0.098 -0.003 0.034 0.000 0.003 0.001 0.003 0.003 0.007 -0.003 0.003 COLLECTION DATE Type Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 I-131 07/29/13 Greens -0.013 0.009 0.001 0.004 0.000 0.007 -0.002 0.004 0.002 0.032 -0.004 0.009 0.002 0.010 07/29/13 Blueberries -0.008 0.006 0.002 0.003 -0.002 0.004 0.000 0.003 0.010 0.024 -0.009 0.007 -0.004 0.006 10/29/13 Squash 0.006 0.009 0.001 0.004 0.010 0.006 -0.005 0.004 -0.015 0.030 0.003 0.009 0.003 0.013 10/29/13 Apples -0.009 0.007 0.001 0.003 -0.001 0.006 0.000 0.004 0.022 0.027 0.002 0.008 -0.001 0.011 COLLECTION DATE Type Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228

(+/-) (+/-) (-/0-0 07/29/13 Greens -0.005 0.003 0.001 0.004 0.010 0.023 -0.004 0.006 0.001 0.006 -0.011 0.022 0.008 0.017 07/29/13 Blueberries -0.009 0.003 0.000 0.003 0.009 0.014 0.000 0.004 0.004 0.005 -0.016 0.019 0.000 0.012 10/29/13 Squash 0.000 0.003 -0.001 0.003 -0.014 0.026 0.002 0.008 0.003 0.006 0.019 0.021 0.000 0.015 10/29/13 Apples 0.000 0.003 0.002 0.003 -0.011 0.023 -0.006 0.007 0.007 0.007 -0.014 0.024 -0.002 0.013 3-27

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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 0/-.0 (00 -0.003- 0.00 (77/-6 .0 (+/-)

07/25/13 Greens -0.014 0.020 3.675 0.150 -0.007 0.026 0.001 0.002 0.000 0.002 -0.003 0.006 0.003 0.003 07/25/13 Blueberries 0.047 0.024 0.812 0.078 0.015 0.028 -0.001 0.002 -0.001 0.003 0.005 0.006 -0.001 0.003 10/29/13 Squash -0.001 0.036 2.258 0.147 -0.023 0.043 0.000 0.004 -0.001 0.005 0.004 0.011 -0.002 0.005 10/29/13 Apples 0.011 0.027 0.690 0.078 -0.023 0.032 0.001 0.003 -0.001 0.003 0.003 0.006 -0.001 0.003 COLLECTION DATE Tp2e Zn-65 Nb-95 RU-106 Sb-125 1-131 Zr-95 Ru-i103

(+/-)

07/25/13 Greens -0.007 0.005 0.000 0.002 0.002 0.004 -0.001 0.002 -0.008 0.019 0.004 0.006 0.004 0.006 07/25/13 Blueberries 0.004 0.006 0.004 0.003 -0.001 0.005 -0.001 0.003 -0.004 0.023 0.001 0.007 0.001 0.008 10/29/13 Squash -0.004 0.011 -0.002 0.005 0.004 0.008 0.000 0.005 -0.022 0.035 0.003 0.011 -0.008 0.015 10/29/13 Apples -0.002 0.006 0.005 0.004 -0.004 0.005 0.000 0.003 0.007 0.023 0.001 0.008 -0.007 0.011 COLLECTION Cs-137 Ba-i140 La-140 Ce-141 Ce- 144 Ac-228 DATE T 2e Cs-134

(+/-)

07/25/13 Greens 0.001 0.002 0.003 0.002 0.006 0.014 -0.003 0.005 0.000 0.004 0.000 0.014 0.002 0.023 07/25/13 Blueberries 0.000 0.003 0.000 0.003 -0.017 0.017 -0.002 0.005 -0.001 0.006 0.003 0.016 0.016 0.018 10/29/13 Squash -0.003 0.004 -0.003 0.004 -0.009 0.032 -0.013 0.010 -0.001 0.007 -0.011 0.019 -0.004 0.019 10/29/13 Apples -0.002 0.003 -0.001 0.003 0.001 0.021 -0.005 0.007 -0.002 0.006 0.009 0.018 0.011 0.012 3-28

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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 07/16/13 1.264 0.267 3.843 0.424 -0.017 0.126 0.003 0.012 -0.002 0.012 0.014 0.024 0.008 0.015 10/01/13 1.122 0.176 3.691 0.319 -0.042 0.093 0.009 0.008 -0.001 0.009 -0.001 0.022 0.002 0.011 COLLECTION DATE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131 07/16/13 -0.010 0.030 -0.001 0.012 -0.018 0.024 -0.010 0.014 0.010 0.116 0.020 0.031 -0.019 0.028 10/01/13 -0.041 0.022 0.002 0.010 0.006 0.016 0.002 0.011 0.023 0.075 -0.016 0.022 0.011 0.033 COLLECTION DATE Cs- 134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228 07/16/13 -0.005 0.015 0.003 0.014 0.054 0.062 0.008 0.019 -0.019 0.024 0.020 0.092 0.059 0.080 10/01/13 -0.005 0.010 0.005 0.009 -0.045 0.065 -0.008 0.016 -0.001 0.015 0.007 0.052 0.035 0.063 LOCATION 10 COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60 07/16/13 0.594 0.241 3.245 0.447 0.191 0.123 0.013 0.013 0.007 0.012 -0.020 0.030 0.004 0.014 10/01/13 0.768 0.153 3.430 0.289 -0.001 0.090 0.004 0.008 0.006 0.009 0.005 0.021 0.006 0.009 COLLECTION DATE Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 1-131

(+/T-)

07/16/13 -0.019 0.029 0.002 0.013 -0.013 0.021 0.000 0.014 -0.093 0.113 -0.002 0.031 0.010 0.028 10/01/13 -0.011 0.021 0.002 0.009 -0.002 0.016 0.004 0.010 -0.041 0.071 -0.005 0.023 0.002 0.031 COLLECTION DATE Cs-134 Cs-137 Ba-140 La-140 Ce-141 Ce-144 Ac-228 07/16/13 -0.008 0.013 0.019 0.012 0.003 0.060 0.002 0.017 -0.008 0.023 0.051 0.087 0.032 0.056 10/01/13 -0.002 0.009 0.009 0.009 0.017 0.066 -0.008 0.015 0.003 0.017 0.034 0.054 0.070 0.055 3-29

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 13 BROADLEAF VEGETATION (pCi/g wet wt.)

LOCATION 17 COLLECTION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 Co-60 07/16/13 1.382 0.256 4.331 0.434 -0.054 0.142 0.002 0.013 0.002 0.013 0.036 0.029 -0.003 0.018 10/01/13 0.936 0.183 3.114 0.300 0.047 0.116 0.010 0.010 -0.008 0.011 -0.005 0.023 0.002 0.011 COLLECTION DATE Zn-65 Nb-95 Zr-95 Ru-i103 Ru-1 06 Sb-125 I-131 07/16/13 -0.026 0.031 -0.003 0.014 -0.001 0.026 -0.005 0.016 -0.010 0.120 -0.004 0.037 -0.018 0.030 10/01/13 -0.028 0.024 0.018 0.012 0.012 0.018 0.006 0.012 0.100 0.088 0.003 0.028 0.004 0.036 COLLECTION DATE Cs-134 Cs-1 37 Ba-140 La-140 Ce-141 Ce-144 Ac-228 07/16/13 0.001 0.015 0.000 0.015 0.041 0.077 -0.006 0.023 -0.009 0.026 0.086 0.097 0.033 0.110 10/01/13 -0.001 0.011 0.008 0.010 0.008 0.074 -0.005 0.024 -0.012 0.021 -0.008 0.067 0.004 0.073 LOCATION 26C COLLECTION DATE Be-7 K-40 Cr-5i Mn-54 Co-58 Fe-59 Co-60 07/16/13 1.060 0.264 3.763 0.498 0.046 0.148 0.007 0.016 -0.007 0.015 0.037 0.034 -0.009 0.019 10/01/13 1.570 0.172 4.511 0.306 -0.014 0.093 0.001 0.008 0.006 0.009 0.002 0.019 0.002 0.009 COLLECTION DATE Zn-65 Nb-95 Zr-95 Ru-i103 Ru-106 Sb-125 1-131 07/16/13 -0.055 0.040 0.019 0.016 0.002 0.024 0.000 0.015 0.066 0.126 0.000 0.038 -0.020 0.032 10/01/13 0.010 0.020 -0.001 0.009 0.002 0.015 0.011 0.010 0.025 0.068 0.001 0.022 0.002 0.030 COLLECTION DATE Cs-134 CS-i137 Ba-140 La-140 Ce-141 Ce- 144 AC-228 07/16/13 -0.001 0.017 -0.014 0.016 0.066 0.082 -0.001 0.021 -0.019 0.024 0.022 0.098 0.133 0.108 10/01/13 -0.003 0.009 0.005 0.009 0.051 0.063 0.005 0.018 0.001 0.018 -0.021 0.059 0.034 0.046 3-30

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 14 SEA WATER (pCi/l)

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

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

01129113 399 131 14.6 37.1 333 99 -16.6 39.4 2.32 4.99 3.29 4.97 -11.9 10.7 02/26/13 637 199 18.7 22.4 334 66 -17.3 24.1 -0.01 2.22 -3.02 2.55 -3.2 5.3 03/26/13 1080 257 8.2 25.0 303 73 -12.0 27.1 0.30 2.94 -0.85 2.63 3.3 6.3 04130113 1050 266 -11.0 30.7 357 90 -47.1 32.8 1.73 3.70 1.96 3.67 2.0 8.4 05128/13 588 142 -1.5 27.3 306 78 8.6 29.0 1.14 3.05 2.59 3.26 1.9 5.8 06/25/13 263 177 7.2 19.3 243 56 5.4 24.9 -1.66 2.06 0.33 2.17 -2.3 4.9 07/30/13 287 169 17.2 30.7 365 76 0.7 32.5 -0.82 3.25 0.32 3.29 6.1 7.5 08127/13 141 168 9.9 12.9 285 40 16.6 15.6 0.24 1.34 -0.67 1.47 2.5 3.3 09/24/13 101 158 -2.6 6.4 313 31 4.5 10.7 -0.09 0.63 -0.48 0.71 -0.3 2.0 10/29/13 205 121 2.7 29.6 291 72 -20.2 34.0 -2.18 3.57 1.68 3.84 0.7 7.3 11/26/13 286 174 11.9 12.2 329 35 5.6 15.3 -0.39 1.10 0.72 1.25 1.6 2.6 12/30/13 643 195 16.9 24.1 309 63 21.8 26.7 0.57 2.39 -1.57 2.63 1.1 5.6 DATE CD-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125 T+17-) --- --+--

1 )ý;T (+/-) (+/-) (+/-) (+/-) (+/-)

01/29/13 3.37 5.14 4.69 10.30 -2.90 4.87 5.96 8.10 -0.80 5.28 -32.6 44.1 0.87 13.00 02/26/13 -1.60 2.37 -3.83 5.12 0.23 2.55 -1.02 4.05 1.92 2.74 -9.6 21.9 -5.61 6.83 03/26/13 0.21 2.82 -2.97 6.48 0.97 2.91 1.44 4.71 0.48 3.13 19.4 25.0 0.92 7.58 04/30/13 1.41 4.07 -10.46 10.90 0.81 3.69 -0.39 5.36 -2.33 4.17 1.0 35.9 3.77 9.95 05/28/13 2.44 3.16 -0.19 7.60 -2.10 3.69 4.07 5.74 -1.93 3.60 -7.8 27.5 -2.41 9.09 06/25/13 0.98 2.29 0.19 4.97 1.54 2.32 0.44 3.65 0.86 2.71 -2.0 19.1 -1.46 5.73 07/30/13 1.23 3.16 -2.97 7.55 2.07 3.27 2.60 5.52 0.16 3.81 5.9 30.3 0.01 9.28 08/27/13 -0.83 1.51 -3.37 3.05 0.82 1.51 -0.62 2.59 -2.15 1.76 7.0 11.6 2.71 3.62 09/24/13 -0.53 1.01 -0.49 1.50 0.53 0.78 0.58 1.34 0.28 0.89 0.8 5.8 1.11 1.68 10129/13 1.07 3.70 -2.97 8.54 2.10 3.86 0.90 6.11 -0.32 4.03 -5.0 30.1 4.44 10.08 11/26/13 -0.72 1.15 0.73 2.63 0.67 1.35 -2.30 2.28 -1.28 1.62 -6.1 10.1 -1.51 3.24 12/30/13 -0.26 2.69 -4.50 5.55 2.52 2.78 1.83 4.67 -0.04 3.09 -2.9 22.2 -0.02 6.61 DATE 1-131 Cs-134 C 7 Ba-140.... .A-c-22.8

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

01/29/13 -9.08 8.89 -2.34 4.92 -5.13 5.19 -21.3 26.3 2.04 7.56 -5.3 16.8 02/26/13 0.99 4.72 -3.80 2.75 -0.95 2.68 9.0 12.3 -0.54 3.66 0.7 9.9 03/26/13 2.54 5.20 0.01 2.86 -2.04 2.94 -0.3 14.4 -3.17 4.06 14.3 16.7 04/30/13 4.84 6.51 -4.89 3.85 0.06 3.41 11.3 16.0 0.65 5.57 -0.7 13.0 05/28/13 -1.60 5.27 -0.86 3.27 1.89 3.26 2.6 14.3 0.28 4.29 -1.5 13.4 06/25/13 -1.94 6.46 0.63 2.35 -0.42 2.18 -1.0 14.7 0.85 4.21 0.3 8.7 07/30/13 3.88 6.68 -0.21 3.58 3.14 3.55 -11.2 18.4 -10.61 5.68 2.6 12.0 08/27/13 -2.57 5.19 -3.35 1.34 0.60 1.36 -0.7 10.1 -0.93 3.43 -7.4 5.8 09/24/13 4.58 7.43 0.10 0.59 0.09 0.66 9.9 9.2 -2.43 3.48 -2.4 3.9 10/29/13 -4.44 6.89 -1.10 4.11 2.09 3.99 -5.1 17.2 2.00 5.04 -2.6 12.9 11/26/13 4.72 6.53 -0.66 1.56 0.09 1.34 0.0 11.4 -4.04 3.38 -1.7 5.4 12130/13 2.39 8.78 2.10 2.78 0.54 2.45 -15.2 20.0 -3.25 6.23 15.4 12.1 3-31

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 14 SEA WATER (pCi/I)

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

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

02/05/13 -28 108 10.79 22.39 295.20 55.55 -20.94 27.54 -1.19 2.04 -1.69 2.39 -5.73 5.15 05/28/13 -28 108 -27.09 26.84 258.70 79.71 21.07 29.24 0.16 3.57 -1.61 3.33 3.77 6.86 09/03/13 102 157 -30.84 26.00 311.00 79.69 -2.19 29.76 -1.85 2.61 0.41 2.89 0.47 5.21 12/17/13 120 108 -2.04 22.23 252.90 76.71 -13.87 23.97 -1.14 2.22 -0.68 2.44 2.17 4.79 COLLECTION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 Sb-125

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

02/05/13 -2.03 2.77 -5.62 6.07 -0.20 2.73 0.40 4.26 -0.06 2.91 -3.11 21.94 5.41 6.65 05/28/13 1.07 3.52 6.90 6.60 0.69 3.85 -1.86 5.18 -0.09 3.14 -7.27 25.87 1.56 8.25 09/03/13 0.07 3.02 -10.05 7.02 1.09 3.07 1.60 5.51 0.14 3.51 -7.13 29.59 1.93 8.87 12/17/13 -0.59 2.33 1.68 5.13 -1.23 2.31 0.62 4.35 -0.32 2.73 -5.43 20.25 -2.24 5.39 COLLECTION DATE 1-131 Cs-134 Cs-137 Ba-1 40 La-140 Ac-228

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

02/05/13 -3.88 8.96 0.61 3.35 -0.61 2.52 -8.53 18.35 3.37 4.90 18.25 10.07 05/28/13 -0.79 4.72 0.20 2.97 -3.34 3.51 -3.43 13.20 4.41 4.57 1.13 12.98 09/03/13 -0.62 6.33 1.88 2.90 -0.12 3.27 -4.08 15.67 -1.13 4.80 -1.23 11.52 12/17/13 -1.09 8.80 0.49 1.79 -0.09 2.43 7.38 18.22 3.93 5.54 2.19 9.64 3-32

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

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

(*/-)

31 02/05/13 0.293 0.319 17.38 1.39 0.153 0.362 0.014 0.038 -0.019 0.037 -0.014 0.078 31 01/06/14 0.029 0.265 17.70 1.25 0.076 0.344 0.005 0.026 -0.005 0.031 0.071 0.077 32 06/11/13 0.082 0.352 16.99 1.56 0.026 0.380 0.012 0.042 -0.051 0.037 0.003 0.092 32 08/20/13 -0.004 0.320 12.69 1.11 0.053 0.364 0.026 0.035 -0.026 0.037 -0.003 0.076 33 02/05/13 -0.115 0.240 10.28 0.84 -0.011 0.297 0.035 0.030 -0.023 0.029 -0.019 0.057 33 08/28/13 -0.069 0.228 22.04 1.22 -0.027 0.272 -0.020 0.023 -0.002 0.026 -0.059 0.078 34 01/09/13 -0.052 0.165 15.20 0.93 -0.108 0.196 0.023 0.018 -0.001 0.019 -0.001 0.055 34 08/28/13 0.297 0.321 16.26 1.23 -0.158 0.456 -0.026 0.030 0.001 0.035 -0.043 0.089 37 01/09/13 0.067 0.210 17.50 1.13 -0.180 0.276 -0.017 0.023 0.003 0.024 0.001 0.063 37 08/28/13 -0.015 0.255 14.90 1.00 -0.219 0.349 -0.001 0.028 -0.010 0.031 -0.113 0.076 39 06/11/13 0.128 0.296 18.50 1.45 0.109 0.330 -0.029 0.037 -0.007 0.035 -0.050 0.074 39 08/08/13 0.016 0.417 17.29 1.91 -0.107 0.440 -0.042 0.051 0.000 0.053 -0.023 0.109 67 02/05/13 0.073 0.308 21.26 1.61 -0.082 0.302 -0.032 0.036 -0.012 0.038 0.003 0.091 67 08/30/13 0.340 0.489 20.91 1.80 -0.377 0.582 0.029 0.047 -0.024 0.050 -0.104 0.129 3-33

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

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

(+/-) 0.036---0-.0 (+1-)

31 02/05/13 0.023 0.042 -0.065 0.093 0.036 0.039 0.061 0.073 -0.028 0.038 0.017 0.361 31 01/06/14 -0.001 0.034 0.017 0.071 0.006 0.032 0.007 0.056 0.002 0.037 0.084 0.212 32 06/11/13 0.055 0.046 -0.264 0.120 -0.001 0.044 0.029 0.073 0.013 0.041 0.187 0.349 32 08/20/13 -0.001 0.038 -0.024 0.081 0.015 0.037 0.048 0.065 0.013 0.035 -0.155 0.263 33 02/05/13 -0.028 0.026 -0.029 0.069 0.052 0.037 0.047 0.053 0.016 0.030 -0.015 0.251 33 08/28/13 -0.005 0.035 -0.010 0.070 0.006 0.028 0.016 0.048 0.024 0.030 -0.008 0.178 34 01/09/13 -0.006 0.025 -0.097 0.050 -0.007 0.021 -0.024 0.035 -0.003 0.021 0.154 0.154 34 08/28/13 -0.020 0.037 -0.070 0.079 0.007 0.039 0.057 0.066 -0.016 0.041 -0.112 0.271 37 01/09/13 -0.011 0.031 -0.066 0.060 -0.001 0.023 0.017 0.041 -0.016 0.027 0.113 0.208 37 08/28/13 -0.011 0.034 -0.107 0.069 0.007 0.032 0.016 0.058 0.021 0.034 -0.168 0.225 39 06/11/13 0.063 0.042 0.003 0.087 0.021 0.037 0.080 0.065 -0.025 0.039 -0.185 0.296 39 08/08/13 -0.004 0.067 -0.192 0.136 0.051 0.054 0.079 0.086 -0.024 0.049 -0.086 0.427 67 02/05/13 0.012 0.056 -0.031 0.100 0.027 0.041 -0.025 0.067 0.012 0.037 -0.046 0.310 67 08/30/13 -0.012 0.052 -0.062 0.123 0.011 0.061 -0.036 0.102 -0.012 0.060 -0.059 0.415 3-34

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 15 BOTTOM SEDIMENT (pCi/g dry wt.)

COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-1 34 Cs-137 Ac-228

(+/-) (+i-)

31 02/05/13 -0.034 0.038 0.002 0.103 0.009 0.090 -0.015 0.042 0.015 0.042 2.663 0.337 31 01/06/14 -0.001 0.025 -0.050 0.067 0.109 0.187 -0.014 0.028 0.005 0.026 0.117 0.217 32 06/11/13 -0.030 0.041 -0.047 0.107 -0.042 0.090 -0.005 0.044 0.011 0.047 0.250 0.351 32 08/20/13 -0.021 0.032 0.015 0.083 -0.008 0.118 0.008 0.036 0.000 0.035 0.175 0.295 33 02/05/13 0.009 0.027 0.006 0.078 0.011 0.065 -0.007 0.030 -0.033 0.030 0.283 0.317 33 08/28/13 -0.036 0.021 -0.017 0.058 -0.071 0.180 0.006 0.020 0.020 0.022 0.287 0.161 34 01/09/13 -0.004 0.016 0.013 0.040 -0.009 0.086 -0.003 0.017 -0.008 0.018 0.127 0.077 34 08/28/13 -0.005 0.027 0.014 0.080 0.268 0.277 -0.014 0.034 -0.031 0.031 0.022 0.110 37 01/09/13 0.000 0.021 0.069 0.058 0.028 0.136 0.004 0.022 0.000 0.023 0.236 0.132 37 08/28/13 -0.001 0.024 -0.023 0.066 -0.063 0.210 0.011 0.028 0.013 0.026 0.180 0.107 39 06/11/13 -0.074 0.037 0.023 0.093 0.008 0.075 0.016 0.039 0.075 0.042 0.802 0.192 39 08/08/13 -0.058 0.050 -0.165 0.126 0.145 0.108 0.002 0.060 0.098 0.055 0.898 0.374 67 02/05/13 -0.011 0.038 0.014 0.086 0.061 0.074 -0.009 0.038 0.014 0.041 0.328 0.327 67 08/30/13 -0.031 0.054 -0.087 0.123 0.039 0.310 -0.024 0.051 0.182 0.074 0.144 0.456 3-35

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 16 AQUATIC FLORA - FUCUS (pCi/g wet wt.)

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

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

29 02/05/13 0.1241 0.1010 6.0280 0.5044 -0.0593 0.0985 -0.0001 0.0120 -0.0011 0.0127 0.0041 0.0269 29 05115/13 0.0855 0.0572 5.6540 0.2514 -0.0124 0.0623 -0.0028 0.0058 0.0012 0.0062 0.0041 0.0148 29 07/25/13 0.2038 0.1239 6.8790 0.3989 -0.0120 0.0415 0.0014 0.0046 -0.o0o5 0.0047 0.0009 0.0102 29 10/10/13 0.0316 0.0983 6.6890 0.5063 -0.0375 0.1090 0.0082 0.0109 0.oo55 0.0122 0.0147 0.0290 32 01/10/13 0.1126 0.0588 10.5400 0.3503 0.0083 0.0674 0.0003 0.0062 0.0257 0.0125 -0.0143 0.0178 32 05/06/13 0.0418 0.0422 9.8600 0.2125 -0.0147 0.0480 0.0024 0.0046 0.0102 0.0050 0.0039 0.0108 32 07/25/13 0.1520 0.1008 8.2100 0.4195 0.0168 0.0433 -0.0014 0.0041 -0.0051 0.0049 0.0001 0.0103 32 10/10/13 0.0195 0.1025 7.2080 0.4898 0.0666 0.0923 -0.0002 0.0100 -0.0053 0.0127 -0.0240 0.0301 35 02/05/13 0.0150 0.0858 4.9300 0.4939 0.0027 0.0961 -0.0093 0.0117 -0.0045 0.0120 0.0140 0.0273 35 05/15/13 0.0684 0.0553 6.8680 0.2576 0.0163 0.0544 0.0000 0.0051 -0.0007 0.0054 0.0046 0.0144 35 07/25/13 0.0720 0.0460 6.9470 0.3726 -0.0103 0.0394 -0.0002 0.0049 0.0023 0.0043 -0.0012 0.0101 35 10/10/13 0.0399 0.0919 7.6100 0.5208 0.0008 0.0988 -0.0083 0.0096 -0.0027 0.0107 0.0043 0.0262 36 02/20/13 0.2248 0.0796 5.5840 0.3439 0.0127 0.0640 -0.0030 0.0085 0.0039 0.0080 -0.0131 0.0173 36 05/16/13 0.0833 0.0682 5.7920 0.2993 -0.0571 0.0691 -0.0036 0.0068 -0.0049 0.0075 0.0046 0.0186 36 08/28/13 0.1028 0.0967 5.9480 0.4732 -0.0759 0.0999 0.0056 0.0100 -0.0048 0.0099 0.0066 0.0226 36 11/13/13 0.0906 0.1056 7.6750 0.5651 0.0381 0.1051 0.0058 0.0119 0.0030 0.0136 0.0074 0.0327 90 01/09/13 0.0794 0.0875 5.4800 0.4230 0.0339 0.0816 0.0060 0.0100 -0.0027 0.0104 0.0008 0.0261 90 05/16/13 0.0684 0.0804 6.0920 0.2597 0.0039 0.0538 -0.0022 0.0062 -0.0031 0.0065 0.0125 0.0168 90 08/28/13 0.0921 0.1216 8.1010 0.6214 0.0586 0.1343 -0.0053 0.0116 -0.0068 0.0134 0.0085 0.0315 90 10/11/13 0.0847 0.0365 7.7130 0.1412 -0.0106 0.0426 0.0006 0.0030 -0.0037 0.0036 0.0075 0.0096 3-36

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 16 AQUATIC FLORA - FUCUS (pCi/g wet wt.)

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

(+/-)

29 02/05/13 0.0047 0.0152 -0.0065 0.0277 0.0035 0.0113 -- 0.0048 0.0214 0.0004 0.0118 0.0372 0.1007 29 05115/13 0.0037 0.0072 -0.0149 0.0141 -0.0016 0.0059 0.0089 0.0104 -0.0005 0.0066 0.0145 0.0495 29 07/25/13 -0.0025 0.0062 0.0044 0.0124 0.0008 0.0045 -0.0049 0.0079 0.0025 0.0051 0.0226 0.0483 29 10/10/13 0.0044 0.0143 -0.0224 0.0306 0.0074 0.0126 0.0147 0.0212 0.0060 0.0131 -0.0133 0.1001 32 01/10/13 -0.0019 0.0077 -0.0207 0.0146 -0.0089 0.0074 0.0041 0.0124 -0.0053 0.0076 0.0212 0.0518 32 05/06/13 -0.0020 0.0058 -0.0175 0.0113 0.0062 0.0050 -0.0057 0.0086 0.0021 0.0051 0.0009 0.0437 32 07/25/13 -0.0059 0.0067 -0.0176 0.0117 -0.0001 0.0051 0.0000 0.0087 0.0020 0.0045 0.0401 0.0385 32 10/10/13 -0.0102 0.0145 -0.0264 0.0287 0.0016 0.0117 -0.0073 0.0211 0.0046 0.0119 0.0165 0.0847 35 02/05/13 -0.0080 0.0154 -0.0098 0.0270 -0.0068 0.0111 -0.0139 0.0188 -0.0026 0.0112 0.0514 0.1008 35 05/15/13 -0.0063 0.0071 -0.0133 0.0140 0.0025 0.0056 0.0008 0.0101 -0.0005 0.0058 -0.0316 0.0445 35 07/25/13 0.0055 0.0061 -0.0046 0.0138 -0.0041 0.0047 0.0025 0.0086 -0.0035 0.0044 0.0091 0.0387 35 10/10/13 -0.0025 0.0146 -0.0426 0.0289 -0.0002 0.0109 0.0110 0.0207 0.0053 0.0117 0.0077 0.0862 36 02/20/13 -0.0074 0.0107 -0.0071 0.0196 -0.0030 0.0083 -0.0062 0.0149 -0.0032 0.0077 0.0189 0.0683 36 05/16/13 0.0037 0.0098 -0.0192 0.0194 0.0016 0.0075 0.0064 0.0131 0.0010 0.0080 -0.0529 0.0574 36 08/28/13 0.0081 0.0134 -0.0111 0.0245 0.0029 0.0096 0.0127 0.0174 0.0056 0.0114 -0.0071 0.0861 36 11/13/13 -0.0125 0.0176 -0.0317 0.0372 -0.0135 0.0144 0.0138 0.0244 -0.0014 0.0115 -0.0750 0.1071 90 01/09/13 -0.0175 0.0134 -0.0111 0.0233 0.0016 0.0097 -0.0063 0.0186 -0.0004 0.0102 -0.0005 0.0772 90 05/16/13 -0.0014 0.0083 -0.0115 0.0159 -0.0015 0.0065 -0.0030 0.0114 -0.0007 0.0064 -0.0068 0.0501 90 08/28/13 -0.0084 0.0170 -0.0409 0.0370 0.0056 0.0135 0.0104 0.0212 0.0051 0.0128 -0.0471 0.1080 90 10/11/13 0.0015 0.0039 0.0048 0.0090 0.0006 0.0036 0.0059 0.0063 -0.0055 0.0043 0.0107 0.0258 3-37

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 16 AQUATIC FLORA - FUCUS (pCi/g wet wt.)

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

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

--- - - - (+1-)

29 02/05/13 -0.0009 0.0099 -0.0038 0.0283 0.0054 0.0239 -0.0084 0.0121 -0.0010 0.0107 0.1073 0.0923 29 05/15/13 -0.0025 0.0053 0.0027 0.0150 0.0005 0.0200 -0.0018 0.0060 -0.0013 0.0059 0.0414 0.0386 29 07/25/13 -0.0014 0.0053 0.0047 0.0128 -0.0018 0.0083 -0.0016 0.0047 0.0016 0.0054 0.0639 0.0522 29 10/10/13 0.0033 0.0110 -0.0158 0.0283 0.0340 0.0307 -0.0165 0.0116 0.0053 0.0122 0.0958 0.0506 32 01/10/13 0.0102 0.0112 -0.0009 0.0133 0.0517 0.0393 -0.0001 0.0061 0.0010 0.0067 0.0999 0.0446 32 05/06/13 0.0190 0.0052 -0.0039 0.0127 0.0338 0.0123 0.0018 0.0050 0.0114 0.0059 0.0383 0.0383 32 07/25/13 0.0012 0.0044 0.0005 0.0137 0.0051 0.0095 -0.0039 0.0040 0.0019 0.0045 0.0503 0.0439 32 10/10/13 0.0128 0.0134 -0.0032 0.0248 -0.0087 0.0297 -0.0099 0.0102 0.0030 0.0113 0.0445 0.0617 35 02/05113 -0.0013 0.0100 0.0105 0.0269 -0.0059 0.0228 -0.0034 0.0098 0.0102 0.0110 0.0884 0.0464 35 05/15/13 0.0019 0.0049 0.0011 0.0120 0.0092 0.0170 -0.0136 0.0051 -0.0030 0.0053 0.0561 0.0318 35 07/25/13 0.0031 0.0039 0.0005 0.0114 0.0160 0.0086 -0.0032 0.0042 -0.0010 0.0049 0.0453 0.0558 35 10/10/13 -0.0039 0.0094 -0.0139 0.0241 0.0080 0.0320 -0.0121 0.0104 0.0074 0.0097 0.0542 0.0465 36 02/20/13 -0.0013 0.0072 -0.0002 0.0194 0.0011 0.0123 -0.0078 0.0079 -0.0007 0.0075 0.0413 0.0583 36 05/16/13 0.0035 0.0063 0.0039 0.0175 0.0220 0.0222 0.0016 0.0074 -0.0053 0.0070 0.0576 0.0352 36 08/28/13 -0.0053 0.0091 -0.0097 0.0245 0.0001 0.0264 0.0042 0.0089 -0.0043 0.0100 0.0495 0.0422 36 11/13/13 -0.0010 0.0118 -0.0068 0.0291 -0.0040 0.0204 -0.0003 0.0129 -0.0055 0.0137 0.1374 0.0820 90 01/09/13 -0.0117 0.0098 0.0144 0.0240 -0.0120 0.0183 -0.0157 0.0098 0.0045 0.0108 0.1280 0.0552 90 05/16/13 -0.0030 0.0056 0.0043 0.0135 0.0149 0.0163 -0.0003 0.0060 0.0019 0.0060 0.1110 0.0373 90 08/28/13 -0.0015 0.0115 0.0037 0.0292 -0.0294 0.0341 -0.0061 0.0141 -0.0056 0.0132 0.0642 0.0548 90 10/11/13 -0.0028 0.0029 0.0011 0.0076 0.0507 0.0376 0.0000 0.0030 -0.0010 0.0034 0.0540 0.0241 3-38

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 17A FISH - FLOUNDER (pCi/g wet wt.)

COLLECTION LOCATION DATE Be-7 K-40 Cr-51 Mn-54 Co-58 Fe-59 29 06/04/13 0.002 0.153 4.627 0.546 0.052 0.169 -0.003 0.016 -0.015 0.018 0.035 0.040 29 07/16/13 -0.044 0.193 3.997 0.665 0.128 0.215 -0.011 0.023 0.000 0.021 0.034 0.038 29 10/08/13 0.036 0.117 4.805 0.312 -0.034 0.142 -0.004 0.012 -0.016 0.013 0.011 0.028 35 05/07/13 -0.025 0.111 4.827 0.379 0.065 0.119 0.005 0.012 0.003 0.013 0.011 0.026 35 07/16/13 0.119 0.202 5.070 0.749 0.080 0.240 0.029 0.026 -0.005 0.024 0.013 0.053 35 10/08/13 -0.004 0.084 4.161 0.331 -0.023 0.100 0.001 0.009 0.002 0.009 0.005 0.022 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106 29 06/04/13 -0.002 0.019 -0.062 0.043 -0.006 0.018 0.005 0.033 -0.003 0.020 0.133 0.145 29 07/16/13 0.005 0.024 -0.020 0.051 0.004 0.023 -0.006 0.042 0.006 0.024 -0.039 0.206 29 10/08/13 0.014 0.012 0.047 0.032 0.009 0.013 -0.028 0.023 0.005 0.015 0.009 0.113 35 05/07/13 -0.002 0.013 -0.009 0.032 0.022 0.013 -0.003 0.022 0.001 0.013 0.017 0.115 35 07/16/13 0.007 0.027 -0.007 0.054 0.000 0.025 0.004 0.047 0.008 0.027 0.088 0.221 35 10/08/13 0.009 0.010 0.012 0.018 -0.005 0.010 0.006 0.017 -0.005 0.011 0.047 0.070 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-134 Cs-137 Ac-228 29 06/04/13 -0.001 0.016 0.017 0.044 -0.007 0.051 -0.025 0.017 0.002 0.017 0.007 0.073 29 07/16/13 -0.001 0.021 0.020 0.058 -0.002 0.043 -0.004 0.026 0.002 0.023 0.011 0.088 29 10/08/13 0.006 0.012 0.017 0.033 0.012 0.047 0.031 0.013 0.000 0.013 0.053 0.044 35 05/07/13 -0.010 0.012 0.001 0.034 -0.010 0.027 -0.012 0.016 0.008 0.013 0.022 0.056 35 07/16/13 -0.005 0.024 0.025 0.064 -0.019 0.050 -0.001 0.029 0.010 0.025 -0.038 0.096 35 10/08/13 -0.002 0.008 -0.006 0.021 -0.022 0.046 0.006 0.008 0.003 0.008 0.030 0.063 3-39

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 17B FISH - OTHER (pCi/g wet wt.)

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

(*7/-)ý-- (+7-) (+/-) (+/-)

29 09/13/13 -0.007 0.208 4.12 0.741 -0.027 0.223 0.013 0.026 0.017 0.024 -0.009 0.058 29 10/02/13 0.058 0.097 4.62 0.303 0.059 0.118 -0.009 0.010 -0.002 0.010 0.020 0.024 32 04/16/13 0.013 0.130 4.85 0.519 -0.157 0.168 -0.007 0.015 -0.017 0.015 0.023 0.039 35 05/07/13 0.018 0.095 4.72 0.377 -0.040 0.096 0.008 0.011 -0.008 0.013 0.013 0.025 35 07/18/13 -0.061 0.136 3.97 0.497 0.057 0.161 0.000 0.013 -0.004 0.016 0.018 0.028 35 10/07/13 0.024 0.082 3.73 0.293 0.001 0.109 0.009 0.008 -0.008 0.009 0.000 0.018 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-) (+/-)

29 09/13/13 0.003 0.029 -0.051 0.054 0.012 0.029 -0.013 0.046 -0.031 0.027 -0.179 0.218 29 10/02/13 0.004 0.011 -0.009 0.025 0.004 0.011 -0.010 0.019 0.000 0.012 0.084 0.094 32 04/16/13 -0.002 0.017 -0.018 0.038 0.021 0.017 0.009 0.029 0.001 0.018 -0.047 0.144 35 05/07/13 0.000 0.016 0.014 0.031 0.004 0.012 -0.003 0.021 -0.001 0.012 -0.024 0.099 35 07/18/13 0.014 0.014 0.007 0.028 -0.009 0.015 0.012 0.026 0.008 0.016 -0.026 0.116 35 10/07/13 0.006 0.009 -0.015 0.018 -0.003 0.009 0.005 0.015 0.001 0.011 0.013 0.074 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs- 134 Cs-137 Ac-228

(+/-) (+/-)

29 09/13/13 0.002 0.024 -0.049 0.065 -0.065 0.061 -0.016 0.027 0.010 0.025 0.037 0.096 29 10/02/13 -0.003 0.010 0.006 0.026 0.012 0.050 -0.005 0.012 -0.008 0.013 0.038 0.062 32 04/16/13 -0.008 0.015 0.056 0.039 0.031 0.050 0.005 0.017 0.005 0.015 0.092 0.097 35 05/07/13 -0.001 0.011 -0.012 0.029 -0.011 0.022 -0.009 0.013 -0.003 0.013 0.006 0.061 35 07/18/13 -0.010 0.013 0.003 0.039 -0.035 0.046 -0.007 0.014 0.021 0.014 -0.033 0.053 35 10/07/13 -0.006 0.008 -0.008 0.024 0.020 0.038 -0.002 0.009 0.006 0.009 -0.011 0.046 3-40

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 18 MUSSELS (pCi/g wet wt.)

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

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

30 06/25/13 0.082 0.245 1.420 0.766 -0.090 0.247 0.009 0.029 0.018 0.031 -0.005 0.064 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-1 03 Ru-106

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

30 06/25/13 0.017 0.034 0.030 0.068 0.039 0.030 0.002 0.050 -0.026 0.030 0.107 0.283 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131 Cs-134 Cs-137 Ac-228

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

30 06/25/13 -0.030 0.028 0.047 0.074 0.016 0.054 0.009 0.034 0.011 0.030 -0.042 0.112 3-41

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 19 OYSTERS (pCi/g wet wt.)

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

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

31 03/06/13 0.029 0.113 1.983 0.715 -0.046 0.121 0.014 0.013 0.006 0.014 -0.021 0.034 31 06/05/13 -0.046 0.187 2.523 0.514 -0.024 0.202 -0.006 0.022 0.002 0.021 -0.018 0.051 31 07/11/13 0.060 0.343 2.395 0.878 0.022 0.307 -0.010 0.034 -0.016 0.036 -0.082 0.090 31 12/11/13 0.066 0.240 2.118 0.726 0.007 0.281 -0.036 0.031 0.001 0.029 -0.020 0.047 32 02/20/13 0.167 0.169 2.870 0.473 -0.030 0.171 0.000 0.019 0.003 0.020 0.007 0.037 32 05/23/13 0.030 0.282 2.439 0.634 0.031 0.310 0.032 0.026 0.032 0.030 0.053 0.055 32 07/09/13 0.024 0.141 2.039 0.712 -0.024 0.186 0.000 0.016 0.006 0.012 0.001 0.030 32 12/11/13 -0.120 0.284 2.148 0.689 -0.006 0.307 0.023 0.031 -0.011 0.026 -0.044 0.068 37 02/22/13 0.061 0.128 1.799 0.423 -0.015 0.160 0.006 0.011 -0.004 0.013 -0.010 0.033 37 06/06/13 -0.235 0.382 1.618 0.770 -0.260 0.478 -0.023 0.033 0.006 0.035 -0.010 0.081 37 07/12/13 -0.027 0.208 1.851 0.554 0.121 0.201 0.005 0.024 -0.012 0.019 0.009 0.044 37 12/10/13 0.035 0.291 1.537 0.835 -0.153 0.346 -0.003 0.032 -0.030 0.033 -0.060 0.068 88 02/26/13 -0.022 0.133 1.313 0.500 -0.006 0.186 -0.007 0.014 -0.001 0.014 0.010 0.025 88 06/06/13 0.151 0.191 1.628 0.489 -0.047 0.204 -0.010 0.024 0.000 0.022 0.007 0.043 88 07/09/13 0.027 0.259 2.164 0.599 0.017 0.319 -0.002 0.027 -0.004 0.027 -0.054 0.055 88 12/10/13 -0.189 0.318 1.463 1.011 -0.160 0.383 0.021 0.040 -0.006 0.037 0.000 0.074 3-42

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 19 OYSTERS (pCilg wet wt.)

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

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

31 03/06/13 0.003 0.017 -0.005 0.027 -0.006 0.016 -0.011 0.021 0.006 0.014 -0.047 0.133 31 06/05/13 0.001 0.023 -0.045 0.051 -0.011 0.022 0.010 0.039 0.019 0.023 -0.066 0.198 31 07/11/13 0.023 0.042 -0.043 0.074 -0.006 0.042 0.026 0.073 -0.027 0.040 0.032 0.297 31 12/11/13 0.021 0.031 -0.009 0.069 -0.008 0.036 -0.020 0.056 -0.024 0.033 -0.133 0.263 32 02/20/13 -0.004 0.019 0.009 0.041 0.020 0.023 0.014 0.038 0.004 0.019 -0.022 0.176 32 05/23/13 -0.012 0.029 -0.053 0.062 0.015 0.031 0.018 0.056 0.006 0.033 -0.120 0.220 32 07/09/13 -0.012 0.017 0.021 0.031 0.008 0.016 0.016 0.027 -0.002 0.017 -0.103 0.122 32 12/11/13 0.011 0.033 0.045 0.090 -0.015 0.035 0.035 0.060 0.004 0.036 -0.101 0.285 37 02/22/13 -0.007 0.012 -0.001 0.023 -0.007 0.017 0.021 0.023 -0.003 0.012 0.031 0.102 37 06/06/13 -0.010 0.037 -0.078 0.077 0.022 0.040 0.004 0.071 0.030 0.047 -0.321 0.374 37 07/12/13 -0.001 0.025 -0.062 0.051 0.003 0.025 0.012 0.046 -0.026 0.023 0.054 0.179 37 12/10/13 0.006 0.030 -0.102 0.074 0.004 0.036 -0.004 0.063 0.009 0.037 0.007 0.275 88 02/26/13 0.000 0.017 0.005 0.028 0.001 0.015 0.001 0.029 -0.020 0.023 -0.035 0.109 88 06/06/13 -0.010 0.025 -0.038 0.054 0.027 0.025 0.010 0.041 0.004 0.024 0.025 0.203 88 07/09/13 0.007 0.026 -0.049 0.056 0.007 0.032 -0.035 0.049 -0.011 0.033 0.239 0.239 88 12/10/13 -0.011 0.039 -0.070 0.083 -0.010 0.040 -0.013 0.063 0.011 0.041 -0.146 0.344 3-43

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 19 OYSTERS (pCi/g wet wt.)

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

(*/-) (+/-)

31 03/06/13 -0.005 0.013 -0.033 0.035 -0.028 0.027 -0.003 0.014 -0.001 0.014 -0.040 0.063 31 06/05/13 -0.012 0.021 -0.007 0.055 0.023 0.056 -0.020 0.023 0.019 0.022 0.001 0.071 31 07/11/13 -0.002 0.031 0.015 0.082 -0.008 0.094 -0.019 0.032 -0.015 0.032 0.060 0.135 31 12/11/13 -0.010 0.031 0.034 0.081 0.021 0.061 -0.028 0.038 -0.005 0.033 -0.014 0.127 32 02/20/13 0.100 0.027 0.033 0.053 0.003 0.034 0.012 0.021 0.001 0.025 0.001 0.096 32 05/23/13 0.116 0.040 -0.007 0.077 0.080 0.096 -0.007 0.030 -0.011 0.035 -0.019 0.081 32 07/09/13 0.012 0.014 -0.012 0.036 0.062 0.044 0.002 0.015 0.011 0.014 -0.070 0.070 32 12/11/13 0.194 0.067 0.091 0.084 -0.018 0.062 0.001 0.034 0.001 0.039 0.068 0.101 37 02/22/13 0.001 0.012 -0.003 0.026 0.035 0.060 0.007 0.011 -0.005 0.013 -0.041 0.054 37 06/06/13 -0.004 0.035 0.002 0.108 -0.087 0.111 0.012 0.047 0.013 0.038 0.162 0.141 37 07/12/13 -0.007 0.022 -0.004 0.057 0.002 0.061 -0.027 0.022 -0.019 0.022 0.008 0.082 37 12/10/13 0.004 0.034 0.054 0.094 0.028 0.074 -0.003 0.037 0.028 0.039 -0.023 0.143 88 02/26/13 0.015 0.015 -0.015 0.042 -0.006 0.049 -0.010 0.019 -0.003 0.012 -0.010 0.063 88 06/06/13 0.013 0.024 -0.018 0.060 0.011 0.053 -0.007 0.022 -0.016 0.024 0.024 0.085 88 07/09/13 0.010 0.027 0.000 0.078 0.006 0.088 0.004 0.034 -0.024 0.028 0.059 0.108 88 12/10/13 -0.003 0.038 0.031 0.103 0.036 0.088 0.008 0.043 0.003 0.041 0.022 0.141 3-44

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 20 CLAMS (pCi/g wet wt.)

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

(./-)

29 02/19/13 -0.121 0.155 2.182 0.531 0.075 0.154 0.004 0.017 -0.016 0.019 -0.009 0.037 29 06/19/13 0.088 0.195 2.025 0.628 0.028 0.244 -0.020 0.020 -0.025 0.023 0.033 0.047 29 09/12/13 0.006 0.165 2.191 0.525 -0.026 0.201 -0.011 0.020 0.006 0.026 0.017 0.042 29 10/15/13 0.008 0.213 2.227 0.587 -0.024 0.274 -0.006 0.021 -0.012 0.024 0.015 0.052 38 03/26/13 0.021 0.171 2.735 0.669 -0.006 0.185 -0.004 0.022 -0.003 0.022 -0.001 0.041 38 06/20/13 0.136 0.264 2.066 0.568 -0.030 0.296 0.014 0.025 0.014 0.028 0.008 0.059 38 09/13/13 -0.011 0.274 2.771 0.793 0.261 0.351 -0.044 0.035 0.017 0.034 0.003 0.073 38 10/15/13 -0.062 0.207 1.911 0.535 0.131 0.295 -0.002 0.021 -0.008 0.020 0.017 0.049 COLLECTION LOCATION DATE Co-60 Zn-65 Nb-95 Zr-95 Ru-103 Ru-106

(+/-)

29 02/19/13 -0.001 0.018 -0.079 0.037 -0.004 0.018 -0.009 0.029 0.014 0.018 0.079 0.161 29 06/19/13 0.014 0.023 0.009 0.051 0.010 0.027 -0.007 0.045 -0.011 0.022 -0.180 0.189 29 29 09/12/13 -0.006 0.026 -0.007 0.049 -0.001 0.019 0.003 0.042 -0.016 0.020 -0.020 0.163 10/15/13 0.002 0.022 -0.074 0.056 0.044 0.028 -0.019 0.038 -0.013 0.027 0.199 0.187 38 03/26/13 -0.012 0.022 -0.054 0.046 0.002 0.020 0.012 0.036 -0.004 0.021 0.057 0.178 38 06/20/13 -0.016 0.028 -0.039 0.067 0.000 0.032 0.001 0.052 0.012 0.037 0.168 0.235 38 09/13/13 0.011 0.031 -0.055 0.079 0.004 0.037 -0.059 0.057 -0.012 0.039 -0.140 0.300 38 10/15/13 -0.017 0.021 -0.005 0.042 0.002 0.022 0.009 0.041 0.005 0.025 0.055 0.173 COLLECTION LOCATION ---- DATE~ --- Ag-Ib0M--- Sb-125 1-131 Cs-i134 Cs-137 Ac-228 29 02/19/13 0.000 0.016 -0.004 0.047 -0.018 0.033 0.002 0.020 -0.010 0.018 -0.006 0.070 29 06/19/13 -0.004 0.021 0.008 0.051 0.003 0.118 -0.044 0.021 -0.007 0.022 0.050 0.082 29 09/12/13 0.006 0.021 -0.011 0.051 0.014 0.057 -0.004 0.024 -0.008 0.022 0.019 0.083 29 10/15/13 0.010 0.016 -0.020 0.052 0.057 0.175 -0.066 0.024 -0.020 0.018 -0.021 0.080 38 03/26113 -0.020 0.019 -0.030 0.046 0.002 0.034 0.018 0.021 0.014 0.021 -0.025 0.082 38 06/20113 -0.014 0.025 0.011 0.077 -0.062 0.141 -0.005 0.032 -0.002 0.028 0.033 0.103 38 09/13/13 -0.013 0.030 -0.012 0.094 -0.045 0.084 0.014 0.038 -0.010 0.031 0.013 0.127 38 10/15/13 0.001 0.019 -0.014 0.053 0.044 0.191 -0.036 0.022 0.007 0.018 0.004 0.069 3-45

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 21 SCALLOPS Scallops were not sampled in 2013. See discussion in Section 4.21 3-46

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE 22 LOBSTERS (pCi/g wet wt.)

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

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

32 03/21/13 0.006 0.234 2.533 0.573 -0.009 0.275 0.020 0.028 -0.026 0.030 -0.015 0.058 32 05/09/13 0.370 0.447 3.140 1.012 0.156 0.528 0.006 0.040 0.003 0.049 -0.050 0.115 32 07/18/13 0.102 0.147 3.849 0.749 0.018 0.151 -0.004 0.015 0.001 0.017 -0.035 0.035 32 10/14/13 0.162 0.247 3.290 0.614 0.069 0.356 0.011 0.023 -0.009 0.030 -0.014 0.070 35 03/11/13 0.054 0.456 3.253 1.062 0.036 0.475 0.030 0.041 0.007 0.043 -0.013 0.109 35 05/07/13 -0.011 0.058 2.869 0.260 -0.036 0.064 -0.001 0.007 -0.009 0.007 0.004 0.013 35 07/18/13 -0.038 0.130 3.722 0.709 -0.048 0.176 -0.006 0.013 -0.010 0.013 -0.005 0.031 35 10/14/13 -0.140 0.269 2.952 0.788 0.180 0.362 -0.006 0.024 -0.014 0.033 0.007 0.069 COLLECTION LOCATION DATE Co-60 Zn-65(+--) Nb-95(+/-) Zr-95 Ru-103 Ru-106

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

32 03/21/13 0.013 0.028 -0.035 0.066 0.029 0.030 0.008 0.049 -0.006 0.030 -0.250 0.247 32 05/09/13 0.033 0.045 -0.120 0.115 0.035 0.055 0.069 0.085 -0.002 0.057 -0.100 0.370 32 07/18/13 -0.015 0.018 0.017 0.035 -0.018 0.018 -0.009 0.023 -0.001 0.020 0.031 0.142 32 10/14/13 0.008 0.032 -0.091 0.065 -0.009 0.031 -0.029 0.048 0.028 0.033 -0.014 0.219 35 03/11/13 -0.012 0.045 -0.033 0.090 0.026 0.044 0.044 0.072 -0.010 0.049 0.262 0.391 35 05107/13 0.001 0.007 -0.008 0.016 -0.002 0.008 -0.004 0.012 -0.004 0.007 0.046 0.065 35 07/18/13 -0.005 0.019 0.013 0.042 -0.014 0.018 0.032 0.029 0.016 0.018 -0.091 0.114 35 10/14113 0.011 0.029 -0.056 0.064 -0.022 0.032 -0.037 0.055 0.008 0.035 0.093 0.247 COLLECTION LOCATION DATE Ag-110M Sb-125 1-131(+--) Cs-134 Cs-137 Ac-228

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

32 03/21/13 0.001 0.025 -0.052 0.073 0.021 0.073 -0.051 0.030 -0.008 0.027 0.033 0.109 32 05/09/13 0.013 0.047 0.060 0.114 -0.217 0.269 -0.001 0.049 0.039 0.045 0.038 0.205 32 07/18/13 -0.001 0.014 -0.024 0.041 -0.026 0.051 -0.002 0.015 -0.003 0.014 -0.003 0.076 32 10/14/13 -0.008 0.025 0.002 0.062 0.263 0.256 -0.004 0.028 0.015 0.026 -0.011 0.095 35 03/11/13 -0.008 0.039 0.039 0.121 0.033 0.164 0.016 0.048 0.034 0.039 0.052 0.150 35 05/07/13 0.003 0.006 0.005 0.018 -0.003 0.014 -0.005 0.008 0.002 0.007 0.018 0.061 35 07/18/13 0.009 0.014 0.011 0.036 -0.017 0.051 -0.010 0.014 -0.003 0.014 -0.032 0.079 35 10/14/13 0.005 0.027 -0.002 0.064 -0.192 0.247 0.025 0.028 0.004 0.029 -0.048 0.105 3-47

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013

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-137 and Sr-90 from atmospheric nuclear weapons testing in the 1960's have been observed in the past. During 2013 Cs-137 from weapons was detected in several samples while Sr-90 was not detected.

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. Readings are recorded as uR/hr. The unit uR stands for 'micro (u)-roentgen' with a

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

The dosimeters are strategically placed at a number of on-site locations, as well as at inner and outer off-site locations. Starting in 2001, the collection of TLDs was changed from monthly to quarterly and additional measurement locations were incorporated into the REMP requirements listed in the REMODCM (Reference 8). Three more locations were added in mid-2003 to prepare for monitoring the potential effect from the ISFSI. Two Dry Cask Containers were loaded in the first quarter 2005. Three containers were loaded in mid 2006, three in October 2007, three in April 2009, and three in October 2010. None were loaded in 2008 or from 2011 to 2013. The exposure rate measurements at two of the three additional TLD locations remain basically unchanged from the background measurements performed prior to any cask loading (six quarter background average mid 2003 - 2004: 9.1 uR/hour at Location 73, 7.4 uR/hour at Location 74 and 6.7 uR/hour at Location 75). At Location 73 the readings in 2013 were lower.

4-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 Table 1 lists the exposure rate measurements for all 44 monitored locations. Trends similar to those of past years are apparent. These measurements demonstrate the general variations in background radiation between the various onsite and offsite locations and include gamma exposure from all sources of radioactivity. For example, the Weather Shack (Location 2), Millstone Unit 3 Discharge (Location 5), Environmental Laboratory (Location 8),

Bay Point Beach (Location 9), Pleasure Beach (Location 10), Corey Road (Location 48), and Site Switchyard Fence (Location 73) experience higher exposure rates due to their proximity to granite beds and stonewalls. In addition, the Mystic (Location 13C) and Ledyard (Location 14C) control locations experience relatively higher background exposure rate than the other control locations at 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 averages of all indicator locations for the period when Millstone Unit 1 was still in operation (through 1995) exhibit the effects of N-16 BWR turbine building skyshine to immediate areas onsite. As discussed in previous annual reports, the effects of skyshine at onsite monitoring stations were increased exposure rates as high as 6 uR/hr at certain onsite locations. The elevated exposure rates from skyshine decreased rapidly with distance to levels indistinguishable from normal background measurements at even the nearest offsite monitoring stations. Also apparent in Figure 4.1-1 is a change of the type of TLD dosimeter in the year 2000. The difference in response between the two types of TLD dosimeters is apparent, with the new type reading 15% to 20% lower. This lower response is consistent for all locations, including both indicator and control locations.

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

The 2009 to 2013 data for Location 3 shows an increase likely attributable to the being closer to granite at the new location.

4-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 4-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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. Because of a loss of power the weekly sample for November 26 at Location

2 was not sufficient to meet the LLD requirement of 0.01 pCi/m 3. Gross beta activity remained at levels similar to that seen over the last decade. Inner and control monitoring locations continue to show no significant variation in measured activities (see Figure 4.2-2).

This indicates that any station contribution is not measurable.

Figure 4.2-1 Air Particulate Gross Beta Activity pCi/m3 Monthly Averages - 2013 0.022

- Indicators - Control 0.018 0.016 0.014 0.012 0.010 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Doc Figure 4.2-2 Air Particulate Gross Beta Activity pCi/m3 Monthly Averages - 5 Year Trend 0.030 -

Indicators Control 0.025--

0.025 0.020 0.015 0.010 0.005 0)o c' 0) *, C.

(n c: - - - - - - -

w Z _0 M 20 - oC) ý22,C 4-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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 2013 charcoal samples. Because of a loss of power the weekly sample for November 26 at Location #2 was not sufficient to meet the LLD requirement of 0.07 pCi/m 3.

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.

4.4 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.

4.5 Soil (Table 6)

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

Figure 4.6-1 Cs-137 in Soil 1.80

--- ' Loc 3 *- Loc 4 .. 0-- Loc 14 1.60 .

1.40 1.20 °I .... t"" ... ..

1.00 -

pci/gm rn 0.80 0.60 ""4-. -

0.40 -, O ... .

0.20 0.00 2001 2003 2005 2007 2009 2011 2013 Year 4-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 4.6 Cow Milk (Table 7)

Typically, the most sensitive indicator of fission product existence in the terrestrial environment is the radiological analysis of milk samples. Milk is a widely consumed food, therefore it is usually one of the most critical exposure pathways. Since 1996 all dairy (cow) farms close enough to Millstone to be considered an indicator location (i.e. within 10 miles) have ceased operation. One cow milk location, about ten and half miles from the plant, was sampled as an extra (i.e.; not required) sample and results are shown in Table 7. Naturally occurring K-40 is the only positive result seen in cow milk.

Each year the Land Use Census is used to identify locations of milk animals that should be included in the monitoring program. It is performed annually and is maintained by observations, door-to-door surveys and consulting with local agriculture authorities. The 2013 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.

4.7 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 2013, no samples were collected.

4.8 Pasture Grass/Hay/Feed (Table 9)

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

Cosmic produced Be-7 was observed in the samples of pasture grass which were taken during the warmer months. Naturally occurring K-40 was present in all samples being approximately two times higher in hay and feed compared to pasture grass samples. Cs-137 from nuclear weapons testing was seen in one sample.

4.10 Well Water (Table 10)

Except for Well Location #80, there were no station related activity detected in the samples collected as part of the REMP. For Well Location #80 a positive H-3 result was found. This well is located in the Unit 3 protected area. There is an ongoing investigation on the source of groundwater tritium in this area. Additional samples from this well, and other wells, were obtained as part of the Groundwater Protection Program (GWPP). Results from the GWPP are reported in the Millstone annual "Radioactive Effluent Release Report" for 2013.

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.

4-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 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.

4.14 Seawater (Table 14)

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

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

Naturally occurring K-40 was the only detectable gamma activity seen in these samples and naturally occurring Ac-228 was seen in one sample. Measured plant related levels of H-3 inseawater from the immediate vicinity of discharge (location 32) were observed in most samples. Tritium releases are typically higher near outages due to the need for increased liquid processing during these times. The higher H-3 levels in March and April are related to the Millstone Unit 3 refueling outage. 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 Millstone liquid effluents versus the measured environmental concentrations from the vicinity of discharge location.

4-7

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 Figure 4.14-1 H-3 Curies Released versus Seawater Concentration 18 Year Trend 1700 1600 1500 1500 -- Curies discharged 1400 S..... . REMP pCi/liter 1300 1200 1100 1000 900 800 700 600 800 J U 30 p ~ 1 i , .-.

500 400 300 ;! " i.7 .7 =

200 100 0

6)

M0 M- M 0 0 2N 4.15 Bottom Sediment (Table 15)

There was no plant related radioactivity detected in bottom sediment samples in 2013.

Naturally occurring K-40 is seen in all samples and naturally occurring Ac-228 in some samples. Cs-1 37 from nuclear weapons testing is seen in samples from Locations #39 and

67. These locations are at areas where inland streams deposit sediment and can be correlated to soil sample results for Cs-137. Several results are greater than their 2a 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.

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-11im) have been detected in the past.

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. Other radionuclides can be accumulated in seaweed. Three positive, plant-related 1-131 measurements were noted in 2013, one on January 10 and one on May 6, both at Location #32 which is Vicinity of Discharge, and one on July 25 at Location #35 which is in Niantic Bay adjacent to the plant. The measurements are consistent with 1-131 seen in liquid effluents with the two at Location #32 related to the Unit 3 outage. Positive results were also seen for Co-58, Ag-110m and Cs-137 on May 6 and for Co-58 on January 10 all at Location #32. These results are related to the Unit 3 outage. A positive 1-131 result was also seen at background location #90 on October 11.

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 July 25 in Niantic Bay (Location #35) may be from this same source. Release of radioactivity in liquid effluents were well below regulatory limits and environment concentrations are comparable to some prior years at the same locations.

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 4-8 4.17 Fish (Tables 17A and 17B)

The activity in Flounder (Table 17A) and Other Fish (Table 177B) is the same as that seen in the past. No activity was observed except for the naturally occurring K-40. Plant-related activity was detected in flounder - Nb-95 in flounder on May 7 at Location #35 and Sb-1 25 in other fish on April 16 at Location #32. Several other results are greater than their 2a error but less than the MDC. Release of radioactivity in liquid effluents were well below regulatory limits and environment concentrations are comparable to some prior years at the same locations.

4.18 Mussels (Table 18)

Similar to the last several years, this sampling media showed no activity except for the naturally occurring K-40. Result for Nb-95 was greater than the 2a error but less than the MDC. Mussels were not available at Two Three Island (Location #28) and were only available at Niantic Shoals (Location #30) for one quarter during 2013.

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 eight years ago to a more accessible area in the middle of the quarry. Although it is labeled as vicinity of the discharge, it was previously located at the end of the quarry.

Naturally occurring K-40 is seen in all samples. Millstone related Ag-11 On was detected in three of four samples from Location #32. This has been an historical occurrence (see discussion below). Several other results are greater than their 2a error but less than the MDC.

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 Millstone Unit 1 in 1996, the amount of Zn-65 in liquid effluents has decreased significantly. Starting in 2001, no Zn-65 has been detected in either the liquid effluents or in oysters. Figure 4.19-1, shows a historical trend that existed between Zn-65 releases and measured concentrations in quarry oysters. The decreasing trend in effluent radioactive releases is apparent in both the curies released and the measured concentrations in oysters.

Figure 4.19-2 shows the trend of Ag-i 1Om concentration in quarry oysters compared to the liquid effluents discharged. Similar to Zn-65, the correlation between Ag-1 1Om discharged and the Ag-11 Omn 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.

The location of the quarry is onsite and not available for public use. No Millstone activity was observed at locations beyond the Millstone 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.

4-9

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 Figure 4.19-1 Zn-65 COMPARISON Curies Curies Discharged vs. Native Oyster Concentration pCilgram 0.01 [100 CuresDishaged 0.01 Oyster Conc. 1 0.001 _ _10 0.0001 .- 4 0.1 0.00001 -. ----

- 0.01 0.000001 0.001 a .. . a. a05 0

. a

ýy

. . a CN

. Quartera a.. a aS aaO a aaua0 Figure 4.19-2 Curies Ag-l10m COMPARISON Oyster Discharge Curies Discharged vs. Oyster Concentration Concentration 0.25 0.0025

-- - Oyster concentration - Curies discharge 0 0.2 ,0.002 0.15 0,0015 0.10 0.1 0.,0005 0.0001 I lka a i I 0 a a. a a a a a i a at

,,,,

a i, \ ' -

Quarter 4-10

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 4.20 Clams (Table 20)

Occasionally this media indicates the presence of station related radioactivity. In 2013 no activity was observed except for the naturally occurring K-40. Several results were greater than their 2a error but 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. Several results were greater than their 2a error but less than the MDC.

4-11

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013

5. COMPARISON TO EFFLUENT DOSE CALCULATION The REMODCM requires that a dose assessment of the measured environmental results be compared to calculated effluent results to confirm the relative accuracy or conservatism of effluent dose calculations.

There are very few plant related results with which to make this comparison. For 2013 the only plant related results were in seaweed, fish and oysters. Because seaweed is not a food source the comparison could not be made using this media. The dose from activity observed in fish and oysters was estimated and compared to effluent dose calculations. The table below gives the values used for this dose assessment and the results.

Dose Whole Highest Conversion Body Nuclide Sample type concentration Consumption* Factor* Dose (pCi/gm) (gm/year) (mRem/gm) (mRem)

Nb-95 Fish 0.022 2.1 E4 1.86E-9 8.6E-7 Sb-125 Fish 0.056 2.1E4 4.26E-7 5.OE-4 Ag-110m Oyster 0.2 5E3 8.79E-8 8.79E-5

Values are from Regulatory Guide 1.109.

The total whole body dose is 5.9E-4 mRem. Effluent liquid whole body dose calculated for Millstone in 2013 is 1.45E-3 mRem (Reference 19). This confirms that the effluent dose calculation is not substantially underestimating the dose as required in 10 CFR Part 50, Appendix I.

5-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013

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, 2013.

9) Millstone Unit 1 Defueled Technical Specifications, Section 5.6.4, "Radioactive Effluents Control Program."

10) Millstone Unit 2 Technical Specifications, Section 6.20, "Radioactive Effluents Control Program."

11) Millstone Unit 3 Technical Specifications, Section 6.15, "Radioactive Effluents Control Program."

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

13) 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," Rev. 1, November 1979.

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

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

19) Millstone Power Station 2013 Radioactive Effluents Release Report.

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 6-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 APPENDIX A LAND USE CENSUS FOR 2013 A-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 The annual land use census in the vicinity of Millstone was conducted as required by the Millstone REMODCM. Typically the cow milk locations are identified by a review of the annual registration information obtained from the State of Connecticut Department of Agriculture. Gardens are located by a drive-by during the harvest season. Although broadleaf sampling was performed and may be used in lieu of a garden census, gardens were included in the 2013 census. Only vegetable gardens having an area of more than 500 square feet need to be identified. Due to the difficulty of measuring individual gardens, the nearest garden within each directional sector identified by a drive-by survey is listed. Garden distances are based on nearest resident assuming that a resident may plant a new garden.

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

Results of the land use census are given in Tables A-1 through A-3. No new dairy animals within 10 miles of the Millstone were located during the census. Twelve of 29 cow locations within 20 miles of miles of Millstone on the 2012 list are not on the 2013 list. The closest cow location at 10.0 miles stopped selling milk in August of 2012.

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

TABLE A-1 Active Dairy Cows Within 20 Miles of Millstone Point - 2013 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 19.2 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 A-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE A-2 Dairy Goats Within 20 Miles of Millstone Point - 2013 Direction Distance Location miles meters N 2.1 3,350 Waterford (REMP 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 NE 2.8 4,510 Waterford ENE 11.5 19,000 Stonington (Mystic)

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 (REMP Location #24)

A-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 TABLE A-3 2013 Resident and Garden Survey Closest Distance For:

Downwind Resident Garden Direction miles meters miles meters N 0.97 1561 0.97 1561 NNE 0.53 853 0.53 853 NE 0.46 740 0.46 740 ENE 0.97 1561 0.97 1561 E 0.91 1464 0.91 1464 ESE 1.1 1770 1.1 1770 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 3701 2.3 3701 WSW 2.0 3218 2.0 3218 W 1.8 2896 1.8 2896 WNW 1.5 2414 1.6 2574 NW 1.3 2092 1.3 2092 NNW 0.51 821 0.51 821 A-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 APPENDIX B

SUMMARY

OF INTERLABORATORY COMPARISONS B-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 INTRODUCTION This appendix summarizes the Intercomparison Program of the Teledyne Brown Engineering (TBE)

Laboratory as required by technical specifications for each Millstone unit. Teledyne uses QA/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 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 2013.

RESULTS For the TBE laboratory, 178 out of 185 analyses performed met the specified acceptance criteria.

Seven analyses (Sr-89 and Sr-90 in milk, Co 57, Zn-65 and Sr-90 in soil, Cs-1 34 in air particulate and Sr-90 in vegetation) did not meet the specified acceptance criteria or internal QA requirements for the following reason:

1) Teledyne Brown Engineering's Analytics September 2013 Sr-89 in milk result of 63.9 pCi/L was lower than the known value of 96.0 pCi/L. The failure was a result of analyst error and was specific to the Analytics sample. Client samples for the associated time period were evaluated and no client samples were affected by this failure. Teledyne Brown Engineering's Analytics September 2013 Sr-90 in milk result of 8.88 pCi/L was lower than the known value of 13.2 pCi/L. The failure was a result of analyst error and was specific to the Analytics sample. Client samples for the associated time period were evaluated and no client samples were affected by this failure.

B-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013

2) Teledyne Brown Engineering's MAPEP September 2013 Co-57 and Zn-65 in soil were evaluated as failing the false positive test. While MAPEP evaluated the results as failures, the gamma software listed the results as non identified nuclides. The two nuclides would never have been reported as detected nuclides to a client. MAPEP does not allow laboratories to put in qualifiers for the submitted data nor "less than" results. MAPEP evaluates results based on the relationship between the activity and the uncertainty. MAPEP spiked the soil sample with an extremely large concentration of Eu-1 52, which was identified by the gamma software as an interfering nuclide, resulting in forced activity results that were evaluated by MAPEP as detected Co-57 and Zn-65. No client samples were affected by these failures.

3) Teledyne Brown Engineering's MAPEP September 2013 Cs-134 in air particulate activity of -0.570 Bq/sample was evaluated as a failed false positive test, based on MAPEP's evaluation of the result as a significant negative value at 3 standard deviations. A negative number would never have been reported as a detected nuclide to a client, therefore no client samples were affected by this failure.

4) Teledyne Brown Engineering's MAPEP September 2013 Sr-90 in vegetation result was investigated due to two low warnings in a row. It appears the September sample was double spike with carrier, resulting in a low activity. With a recovery of around 50% lower, the Sr-90 result would have fallen within the acceptance range. No client samples were affected by this issue.

B-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 APPENDIX C Erratum C-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Power Station 2013 Erratum - Correction to Millstone 2012 Annual Radiological Environmental Operating Report During 2013 the analyses vendor discovered that a wrong value had been applied in the algorithm to calculate Lower Limit of Detection (LLD) resulting in incorrect LLDs on some sample results. Correct LLDs were recalculated and the sample results were revised on April 26, 2013. Copies of the revised results were received by the vendor on May 8, 2013. The values reported in Millstone's 2013 report includ the corrected values. Some of the incorrect LLDs were reported in Millstone's 2012 report and they are corrected with this erratum.

For analyses performed in 2012 with incorrectly calculated LLDs, eight corrected values did not meet the (LLD) for 1-131 as required by Table I.E-4 of the REMODCM. The samples included five well water, two sea water and one vegetation. Each sample with date of sample, required LLD and the revised LLD are shown in the table below.

Sample LLD Identification Date Results* Required* Corrected reported value*

Well M3-MW-1 12/19/12 7.9 15 20.3 Well M3-MW-1 6/25/12 1.7 15 16.3 Well MW-GPI-2 6/25/12 8.9 15 20.0 Well S2-MW-1 3/8/12 -0.2 15 15.5 Well MW-GPI-9 3/8/12 1.4 15 17.5 Seawater Giant's 7/10-8/14/12 11.72 15 19.1 Neck Seawater Vic of 10/28-11/27/12 4.23 15 16.8 Discharge Vegetation Site 7/17/12 -0.043 0.06 0.0805 Boundary

Units are pCi/I for water and pCi/gm for vegetation.

In all cases the corrected LLDs which exceeded the required LLDs were no more than 36%

higher than the required LLDs. All samples results were less than the reportability levels of 20 pCi/I for water and 0.1 pCi/gm for vegetation.

C-2

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