Text

Annual Radiological Environmental Operating Report for January 2007 Through December 2007
	ML081270530
Person / Time
Site:	Millstone
Issue date:	04/28/2008
From:	Price J; Dominion, Dominion Nuclear Connecticut
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	08-0123
	Download: ML081270530 (135)
	v • d • e

Dominion Nuclear Connecticut, Inc.

Millston* Power Station Rope Fer!y Road, Waterford, CT 06385 11,

4"Dominiow APR 2 8 2008 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Serial No.

MPS Lic/GJC Docket Nos.

License Nos.

08-0123 RO 50-245 50-336 50-423 DPR-21 DPR-65 NPF-49 DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNITS 1, 2, AND 3 2007 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT This letter transmits the Annual Radiological Environmental Operating Report for the Millstone Power Station, for the period January 2007 through December 2007. 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, J.

rice Siteice President -Millstone D3I~

Serial No. 08-0123 2007 Annual Radiological Environmental Operating Report Page 2 of 3 Attachments:

1 Commitments made in this letter: None.

cc:

U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 Mr. J. B. Hickman NRC Project Manager Millstone Unit 1 U.S. Nuclear Regulatory Commission Mail Stop T-7E18 Washington, DC 20555 Ms. L. A. Kauffman NRC Inspector U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 Mr. J. D Hughey Project Manager U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 8B3 Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station

SerialNo. 08-0123 2007 Annual Radiological Environmental Operating Report Page 3 of 3 (2copies)

Director Bureau of Air Management Monitoring & Radiation Division Department of Environmental Protection 79 Elm Street Hartford, CT 06106-5127

Serial No.: 08-0123 Docket Nos. 50-245 50-336 50-423 License Nos. DPR-21 DPR-65 NPF-49 ATTACHMENT 1 2007 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION UNITS 1, 2, AND 3 DOMINION NUCLEAR CONNECTICUT, INC. (DNC)

Millstone Power Station 2007 Radiological Environmental Operating Report January 1, 2007 - December 31, 2007 Dominion Nuclear Connecticut, Inc.

Unit 1

2 3

License DPR-21 DPR-65 NPF-49 Docket 50-245 50-336 50-423

=p*Domi nion,,

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM 2007 MILLSTONE UNIT 1, DOCKET NO. 50-245 MILLSTONE UNIT 2, DOCKET NO. 50-336 MILLSTONE UNIT 3, DOCKET NO. 50-423 By the Dominion Nuclear Connecticut, Inc.

Waterford, Connecticut

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 TABLE OF CONTENTS EXECUTIVE

SUMMARY

......................................................................I

1. INTRODUCTION................................................................

1-1 1.1 Overview..................................................................

1-1 1.2 Radiation and Radioactivity............................................. 1-1 1.3 Sources of Radiation....................................................

1-2 1.4 Nuclear Reactor Operations............................................

1-3 1.5 Radioactive Effluent Control............................................

1-8 1.6, Radiological Impact on Humans......................................

1-11

2. PROGRAM DESCRIPTION......................................................

2-1 2.1 Sampling Schedule and Locations.....................................

2-1 2.2 Samples Collected During Report Period.............................. 2-7

3. RADIOCHEMICAL RESULTS....................................................

3-1 3.1 Summary Table..........................................................

3-1 3.2 Data Tables.............................................................

3-19

4. DISCUSSION OF RESULTS...................................................

3-20 4.1 Gamma Exposure Rate (Table 1).............I......................... 4-1 4.2 Air Particulate Gross Beta Radioactivity (Table 2)...................

4-3 4.3 Airborne Iodine (Table 3)............................................... 4-3 4.4 Air Particulate Gamma (Table 4A-D).................................. 4-5 4.5 Air Particulate Strontium (Table 5)..................................... 4-5 4.6 Soil (Table 6)............................................................

4-5 4.7 Cow Milk (Table 7)......................................................

4-5 4.8 Goat Milk (Table 8)...................................................... 4-6 4.9 Pasture Grass and Feed (Table 9)....................................

4-6 4.10 Well Water (Table 10)..................................................

4-7 4.11 Reservoir Water (Table 11)............................................

4-7 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 Sediment (Table 15)...........................................

4-9 4.16 Aquatic Flora (Table 16)..............................................

4-10 4.17 Fish (Tables 17A and 17B)...........................................

4-10 4.17.1 Flounder (Table 17A)........................................

4-10 4.17.2 Fish - Other (Table 17B)..................................... 4-10 4.18 Mussels (Table 18)....................................................

4-11 4.19 Oysters (Table 19).....................................................

4-11 4.20 Clams (Table 20)......................................................

4-12 4.21 Scallops (Table 21).................................................... 4-12 4.22 Lobsters (Table 22).................................................... 4-12

5. OFFSITE DOSE EQUIVALENT COMMITMENTS................................

5-1

6. DISCUSSION.....................................................................

6-1

7. REFERENCES...................................................................

7-1 APPENDIX A - LAND USE CENSUS FOR 2007.............................

...... A-i APPENDIX B - DNC QA PROGRAM...................................

...... B-i APPENDIX C -

SUMMARY

OF INTERLABORATORY COMPARISONS.............. C-1

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 F

V

-.- 1

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 EXECUTIVE

SUMMARY

INTRODUCTION This report summarizes the results of the Radiological Environmental Monitoring Program (REMP) conducted in the vicinity of Millstone Power Station (MPS) during the period from January 1 to December 31, 2007. This document has been prepared in accordance with the requirements of Millstone Unit 2 and 3 Technical Specifications.

The REMP has been established to monitor the radiation and radioactivity released to the environment as a result of Millstone Station'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 Station on the environment and on the general public.

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

During 2007, there were 1103 samples collected from the atmospheric, aquatic, and terrestrial environments. In addition, 176 exposure measurements were obtained using environmental thermoluminescent dosimeters (TLDs).

A small number of inadvertent issues were encountered in 2007 in the collection of environmental samples in accordance with the Millstone Radiological Effluent Monitoring and Offsite Dose Calculation Manual (REMODCM).

Equipment failures and power outages resulted in a small number of instances in which lower than normal sampling volumes were collected at the airborne monitoring stations. In no cases were sampling outages of a duration to not yield a sample.

All 416 air particulate and charcoal cartridges were collected and analyzed as required.

A full description of all discrepancies encountered with the environmental monitoring program is presented in the Notes for the Data Tables of this report.

There were 1415 analyses performed on the environmental media samples.

The AREVA-NP Environmental Laboratory of Westboro, MA, performed these analyses.

Samples were analyzed as required by the Millstone REMODCM.

LAND USE CENSUS The annual land use census in the vicinity of Millstone Station was conducted as required by the Millstone REMODCM between July 15 and December 31, 2007.

Although only vegetable gardens having an area of more than 500 square feet need to be identified, due to the difficulty of measuring individual gardens, all gardens identified by a drive-by survey are listed in Appendix A. No new milk or meat animals within 10 miles of the Station were located during the census. Millstone also performs monthly broad leaf sampling that may be used in lieu of the garden census.

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 RADIOLOGICAL IMPACT TO THE ENVIRONMENT Most samples collected as part of the Millstone REMP continued to contain detectable amounts of naturally-occurring and man-made radioactive materials. No station effects were detected in terrestrial media.

Offsite ambient radiation measurements using environmental TLDs beyond the site boundary ranged between 55 and 90 milliRoentgens per year. The range of ambient radiation levels observed with the TLDs is consistent with natural background radiation levels for Connecticut.

Monitoring of the aquatic environment in the area of the discharge indicated the presence of the following station related radionuclides: Silver-i 1 Omn, and Tritium. The predominant radioactivity was from non-plant related sources, such as fallout from nuclear weapons tests and naturally occurring radionuclides.

RADIOLOGICAL IMPACT TO THE GENERAL PUBLIC During 2007, radiation doses to the general public as a result of Millstone Station's operation continued to be well below the federal limits and much less than the dose due to other sources of man-made (e.g., X-rays, medical) and naturally-occurring (e.g.,

cosmic, radon) radiation.

The calculated total body dose to the maximally exposed member of the general public from radioactive effluents and ambient radiation resulting from MPS operations for 2007 was approximately 0.2 mrem for the year. This conservative estimate is well below the EPA's annual dose limit to any member of the general public and is a fraction of a percent of the typical dose received from natural and other sources of man-made radiation.

CONCLUSIONS The 2007 Radiological Environmental Monitoring Program for Millstone Station 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 Station'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 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 Station's operation.

ii

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007

1.

INTRODUCTION This section provides an overview of the Millstone Power Station Radiological Environmental Monitoring Program. It also includes background information to allow a reader to have an informed understanding of radiation and nuclear power operation.

1.1 Overview The Radiological Environmental Monitoring Program for 2007 performed by Dominion Nuclear Company for Millstone Nuclear Power Station (MPS) is discussed in this report.

Since the operation of a nuclear power plant results in the release of small amounts of radioactivity and low levels of radiation, the Nuclear Regulatory Commission (NRC) requires a program to be established to monitor radiation and radioactivity in the environment (Reference 1).

This report, published annually per Millstone Station's Technical Specifications (section 6.9.1.6 for Unit 2 and Section 6.9.1.3 for Unit 3),

summarizes the results of measurements of radiation and radioactivity in the environment in the vicinity of the Millstone Station and at distant locations during the period January 1 to December 31, 2007.

The Radiological Environmental Monitoring Program 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, goat milk, pasture grass, hay, well water, broadleaf vegetation, fruits, vegetables, seawater, bottom

sediment, aquatic

flora, fish,

mussels, oysters, clams and lobster.

Thermoluminescent dosimeters (TLDs) are placed in the environment to measure gamma radiation levels. The TLDs are processed and the environmental samples are analyzed to measure the very low levels of radiation and radioactivity present in the environment as a result of MPS operation and other natural and man-made sources.

These results are reviewed by MPS's radiological staff and have been reported semiannually or annually to the Nuclear Regulatory Commission 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 Station.

1.2 Radiation and Radioactivity All matter is made of atoms. An atom is the smallest part 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 by unstable, radioactive atoms.

1-1

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 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-1 37 and strontium-90. Some examples of radioactive materials released from a nuclear power plant are cesium-137, iodine-131, strontium-90, and cobalt-60.

Radiation is measured in units of millirem, much like temperature is measured in degrees. A millirem (mrem) is a measure of the biological effect of the energy deposited in tissue.

The natural and man-made radiation dose received in one year by the average American is 300 to 400 mrem (References 2, 3, 4,5).

Radioactivity is measured in Curies.

Levels of radioactivity commonly seen in the environment are typically a small fraction of a Curie. Therefore, radioactivity in the environment is typically measured in picocuries. One picocurie (pCi) is equal to 0.037 disintegrations per second (2.22 disintegrations per minute).

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

Table 1.3 Radiation Sources and CorresDondinQ Doses NATURAL MAN-MADE Radiation Dose Radiation Dose Source j

(millirem/year)

Source (millirem/year Cosmic/cosmogenic 28 Medical/Dental X-Rays 39 Internal (in the body) 40 Nuclear Medicine 14 Terrestrial

16 Consumer Products 10 Radon/Thoron 200 Weapons Fallout 1

Nuclear Power Plants 1

Approximate Total 284 Approximate Total 60

Atlantic and Gulf Costal Plain Cosmic radiation 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.

1-2

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 Additionally, natural radioactivity is in our body and in the food we eat (about 40 millirem/year), the ground we walk on (about 16 millirem/yr) and the air we breathe (about 200 millirem/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 300 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 U.S. from medical and dental exposure is about 50 millirem.

Consumer products, such as televisions and smoke detectors, contribute about 10 millirem/year.

Much smaller doses result from weapons fallout (less than 1 millirem/year) and nuclear power plants (less than 1 mrem/year). Typically, the average person in the United States receives about 60 millirem per year from man-made

sources, 1.4 Nuclear Reactor Operations Millstone Station generates about 2000 megawatts of electricity at full power, which provides approximately one-half of the power consumed in the State of Connecticut.

Unit 2 and Unit 3 are pressurized water reactors (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, CT.

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

Millstone Station was operational during most of 2007, with the exception of a Unit 3 refueling outage, which was performed between April 6 and May 19.

The resulting monthly capacity factors are presented in Table 1.4.

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 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 recirculates back through the system.

The cooling water source for Millstone Station is the Niantic Bay.

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 make use of uranium in a nuclear reactor.

1-3

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 TABLE 1.4 MPS OPERATING CAPACITY FACTOR DURING 2007 (Based on designed electrical rating)

Month Unit 2 Percent Capacity Unit 3 Percent Capacity January 99.7%

88.1%

February 99.7%

99.5%

March 99.5%

99.5%

April 99.6%

18.8%

May 99.2%

35.7%

June 99.2%

98.9%

July 99.1%

98.5%

August 98.9%

97.9%

September 99.0%

97.9%

October 99.2%

98.2%

November 99.6%

98.8%

December 98.8%

99.0%

Annual Average 99.3%

T 85.9%

shutdown for refueling during these months 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 (Reference 6), 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 (I-131), xenon-1 33 (Xe-1 33), and cesium-1 37 (Cs-1 37).

1-4

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Nuclear Fission Fission is the splitting of the uranium-235 atom 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 Radiation Neutr~ons Uranium Uranium Fission Products Figure 1.4-1 Radioactive Fission Product Formation 1-5

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 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).

-0 Neutron Stable Cobalt Nucleus Radioactive Cobalt Nucleus Figure 1.4-2 Radioactive Activation Product Formation At Millstone Nuclear Power Station there are five independent protective barriers that confine these radioactive materials. These five barriers, which are shown in Figure 1.4-3 (Reference 6), are:

0 0

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

1-6

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 I

SIMPLIFIED DIAGRAM OF A PRESSURIZED WATER REACTOR 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.

1-7

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 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.

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 Station 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.

1-8

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 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.

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 in 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:

1-9

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 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 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.

Gases from the primary coolant are held up in waste gas decay tanks for decay at Unit

2. Gaseous waste at 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 Unit 2 containment are released through a similar process system (Enclosure Building Filtration System) while gases from the Unit 3 containment vacuum pumps are released without treatment.

If necessary, 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 Unit 2 are filtered by high-efficiency particulate filters while at 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 Unit 3, for 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 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 impilement procedures to ensure that federal regulatory limits are always met.

1-10

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 1.6 Radiological Impact on Humans The final step in the effluent control process is the determination of the radiological dose impact to humans and comparison with the federal dose limits to the public. This step is performed in three stages.

As mentioned previously, the purpose of continuous radiation monitoring and periodic sampling and analysis is to measure the quantities of radioactivity being released to determine compliance with the radioactivity release limits.

This is the first stage for assessing releases to the environment.

The second stage is calculations of the dose impact to the general public from Millstone Station'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 -fromn Millstone Station during each given year are reported to the Nuclear Regulatory Commission annually in the Radiological Effluent Release Report (RERR). Similar to this report, the RERR is submitted annually to the Nuclear Regulatory Commission.

Section 5 of this report discusses the detailed dose calculations from the,RERR and provides a comparison to REMP dose calculations. The liquid and gaseous effluents were well below the federal release limits and were a small percentage of the MPS REMODOM effluent control limits.

The measurements of the physical and chemical nature of the effluents are used to determine how the radionuclides will interact with the environment and how they can result in radiation exposure to humans.

The environmental interaction mechanisms depend upon factors such as the hydrological (water) and meteorological (atmospheric) characteristics in the area.

Information on the water flow, wind speed, wind direction, and atmospheric mixing characteristics are used to estimate how radioactivity will distribute and disperse in the ocean and the atmosphere.

The most important type of information that is used to evaluate the radiological impact on humans is data on the use of the environment.

Information on fish and shellfish consumption, boating usage, beach usage, locations of cows and goats, locations of residences, locations of gardens, drinking water supplies, and other usage information are utilized to estimate the amount of radiation and radioactivity received by the general public.

The radiation exposure pathway to humans is the path radioactivity takes from its release point at Millstone Station 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 Station 2007 EXAMPLES OF MILLSTONE STATION'S RADIATION EXPOSURE PATHWAYS

11

.r

/.

' J.

'.. r % J LIQUID EFFLUENTS 4.DIRECT RADIATION (STATIO)

2. AIR INHALATION (SOIL DEPOSITION)

/V"1.

DIRECT RADIATION 1

i(AIR SUBMERSION)

1. SHORELINE DIRECT RADIATION (FISHING, PICNICING )

.)"

5. CONSUMPTION 1

(

'(VEGETATION)

]

DEPOSITION

2. DIRECT RADIATION

-4

'r-

/

BOATING, SWIMMING) 7

6. CONSUMPTION

\\(MILK AND MEAT)

DEPOSITION INGESTION.

3. CONSUMPTION Figure 1.6 Radiation Exposure Pathways 1-12

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 There are three major pathways in which liquid effluents affect humans:

" external radiation from liquid effluents that deposit and accumulate on the shoreline; external radiation from immersion in ocean water containing radioactive liquids; and, internal radiation from consumption of fish and shellfish containing radioactivity absorbed from the liquid effluents.

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

external radiation from an airborne plume of radioactivity; internal radiation from inhalation of airborne radioactivity;

" external radiation from deposition of radioactive effluents on soil;

" ambient (direct) radiation from contained sources at the power plant; internal radiation from consumption of vegetation containing radioactivity deposited on the vegetation from airborne deposition and absorbed from the soil due to ground deposition of radioactive effluents; and, internal radiation from consumption of milk and meat containing radioactivity deposited on forage that is eaten by cattle and other livestock.

In addition, ambient (direct) radiation emitted from contained sources of radioactivity at MPS contributes to radiation exposure in the vicinity of the plant.

Small amounts of ambient radiation result from low-level radioactive waste being processed and stored at the site prior to shipping and disposal. Also, the operation of an ISFSI, (independent Spent Fuel Storage Installation, operation began in 2005) results in very small amounts of direct radiation at the site boundary.

The radiological dose impact on humans is based both on effluent analyses and modeling and on direct measurements of radiation and radioactivity in the environme 'nt.

When MPS-related radioactivity is detected in samples that represent a plausible exposure pathway, the resulting dose from such exposure is assessed (see Sections 4 and 5). However, the operation of Millstone Power Station 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 Dominion Nuclear personnel. These computer codes use the guidelines and methodology set forth by the NRC in Regulatory Guide 1.109 (Reference 7).

The dose calculations are documented and described in detail in the Millstone Nuclear Power Station's Radiological Effluent Monitoring and Offsite Dose Calculation Manual (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 Station 2007 After dose calculations are performed, the results are compared to the federal dose limits for the public. The two federal agencies that are charged with the responsibility of protecting the public from radiation and radioactivity are the Nuclear Regulatory Commission (NRC) and The Environmental Protection Agency (EPA).

The NRC, in 10CFR 20.1301 (Reference 9) limits the levels of radiation to unrestricted areas resulting from the possession or use of radioactive materials such that they limit any individual to a dose of:

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

In addition to this dose limit, the NRC has established design objectives for nuclear plant licensees.

Conformance to these guidelines ensures that nuclear power reactor effluents are maintained as far below the legal limits as is reasonably achievable.

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

" less than or equal to 3 mrem per year, to the total body; and, less than or equal to 10 mrem per year to any organ.

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

less than or equal to 10 mrad per year for gamma radiation; and, less than or equal to 20 mrad per year for beta radiation.

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

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

The EPA, in 40CFR190.10 Subpart B (Reference 11), sets forth the environmental standards for the uranium fuel cycle. During normal operation, the annual dose to any member of the public, at or beyond the site boundary, from the entire uranium fuel cycle shall be limited to:

" less than or equal to 25 mrem per year to the total body; less than or equal to 75 mrem per year to the thyroid; and, less than or equal to 25 mrem per year to any other organ.

The summary of the 2007 radiological impact for Millstone Station and comparison with the EPA dose limits and Appendix I guidelines is presented in Section 5 of this report.

The third stage of assessing releases to the environment is the Radiological Environmental Monitoring Program (REMP). The description and results of the REMP at Millstone Power Station during 2007 is discussed in Sections 2 through 4 of this report.

1-14

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007

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 and 2.2. The program as described on Table 2-2 only lists the required samples as specified in the Radiological Effluent Monitoring and Offsite Dose Calculation Manual. 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.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 2-1 Environmental Monitoring Program Sampling Types and Locations Location Direction & Distance Number*

Location Name From Release Point**

Sample Types 1-1 2-1 3-1 4-1 5-1 6-1 7-1 8-1 9-1 10-1 11-1 12-C 13-C 14-C 15-C 16-C 17-1 21-1 22-1 24-C 25-1 26-C 27-1 28-1 29-1 30-1 31-1 31 -X 32-1 32-X 33-1 33-X 34-1 34-X 35-1 35-X 36-1 36-X 37-C On-site - Old Millstone Rd.

On-site - Weather Shack On-site - Bird Sanctuary On-site - Albacore Drive MP3 Discharge Quarry Discharge Environmental Lab Dock Environmental Lab Bay Point Beach Pleasure Beach New London Country Club Fisher's Island, NY Mystic, CT Ledyard, CT Norwich, CT Old Lyme, CT Site Boundary Goat Location #1 Goat Location #2 Goat Location #4 Within 10 Miles Beyond 10 Miles Niantic Two Tree Island West Jordan Cove Niantic Shoals Niantic Shoals Niantic Shoals Vicinity of Discharge Vicinity of Discharge Seaside Point Seaside Point Thames River Yacht Club Thames River Yacht club Niantic Bay Niantic Bay Black Point Black Point Giant's Neck 0.6 Mi, NNW 0.3 Mi, S 0.3 Mi, NE 1.0 Mi, N 0.1 Mi, SSE 0.3 Mi, SSE 0.3 Mi, SE 0.3 Mi, SE 0.4 Mi, W 1.2 Mi, E 1.6 Mi, ENE 8.0 Mi, ESE 11.5 Mi, ENE 12.0 Mi, NE 14.0 Mi, N 8.8 Mi, W 0.5 Mi, NE 2.0 Mi, N 2.7 Mi, NE 29.0 Mi, NNW Within 10 Miles Beyond 10 Miles 1.7 Mi, WNW 0.8 Mi, SSE 0.4 Mi, NNE 1.5 Mi, NNW 1.8 Mi, NW 1.8 Mi, NW

< 0.1 Mi

< 0.1 Mi 1.8 Mi, ESE 1.8 Mi, ESE 4.0 Mi, ENE 4.0 Mi, ENE 0.3 Mi, WNW 0.3 Mi, WNW 3.0 Mi, WSW 3.0 Mi, WSW 3.5 Mi, WSW 3.5 Mi. WSW TLD, Air Particulate, Iodine, Vegetation TLD, Air Particulate, Iodine TLD, Air Particulate, Iodine, Soil TLD, Air Particulate, Iodine, Soil TLD TLD TLD TLD TLD TLD, Air Particulate, Iodine, Vegetation TLD, Air Particulate, Iodine TLD TLD TLD, Soil TLD, Air Particulate, Iodine TLD Vegetation Milk Milk Milk Fruits & Vegetables Fruits & Vegetables TLD, Air Particulate, Iodine Mussels Clams Mussels Bottom Sediment, Oysters Scallops Bottom

Sediment, Oysters, Lobster, Fish, Seawater Fucus Bottom Sediment Fucus Bottom Sediment Oysters Lobster, Fish Bottom

Sediment, Clams, Fucus Oysters Bottom Sediment, Fucus Bottom

Sediment, Oysters, Seawater Lobster 37-X Giant's Neck

Key:

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

- The release points are the MP1 stack for terrestrial locations and the quarry cut for aquatic locations.

2-2

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Location Direction & Distance Number*

Location Name From Release Point**

Sample Types 38-1 39-X 40-X 41-1 42-1 43-1 44-1 45-1 46-1 47-1 48-1 49-1 50-1 51-1 52-1 53-1 55-1 56-1 57-1 59-1 60-1 61-1 62-1 63-1 64-1 65-1 66-X 67-X 69-X 71-1 72-1 73-X 74-X 75-X 76-X 77-X 78-X 79-X 80-X 81 -X 82-X 83-X 84-X 85-X 86-X 90-C Waterford Shellfish Bed #1 Jordon Cove Bar Quarry Myrock Avenue Billow Road Black Point Onsite - Schoolhouse Onsite Access Road Old Lyme - Hillcrest Ave.

East Lyme - W. Main St.

East Lyme - Corey Rd.

East Lyme - Society Rd.

East Lyme - Manwaring Rd.

East Lyme - Smith Ave.

Waterford - River Rd.

Waterford - Gardiners Wood Rd.

Waterford - Magonk Point New London - Mott Ave.

New London - Ocean Ave.

Waterford -Miner Ave.

Waterford - Parkway South Waterford - Boston Post Rd.

East Lyme - Columbus Ave.

Waterford - Jordon Cove Rd.

Waterford - Shore Rd.

Waterford - Bank St.

NAP Parking Lot Fitness Center Golden Spur Pleasure Beach Onsite Well Onsite Well Site Switchyard Fence Ball Field Foul Pole Waterford - Windward Way &

Shotgun Onsite Well - ISFSI Control Onsite Well - ISFSI Indicator Onsite Well - ISFSI Indicator Onsite Well Onsite Well Onsite Well Onsite Well Onsite Well Onsite Well Onsite Well Onsite Well Thames River 1.0 Mi, NW 0.8 Mi, NE 3.2 Mi, ENE 2.4 Mi, WSW 2.6 Mi, SW 0.1 Mi, NNE 0.5 Mi, NNW 4.6 Mi, WSW 4.5 Mi, W 3.4 Mi, WNW 3.6 Mi, NW 2.1 Mi, W 1.5 Mi, NW 1.1 Mi, NNW 1.4 Mi, NNE Clams Bottom Sediment, Clams, Fucus Fish, Oysters TLD TLD TLD TLD TLD TLD TLD TLD TLD TLD TLD TLD TLD 1.8 Mi, 3.7 Mi, 3.6 Mi, 3.4 Mi, 4.0 Mi, 4.3 Mi, 1.9 Mi, 0.8 Mi, 1.1 Mi, 3.2 Mi, 0.4 Mi, ESE E

ENE NNE N

NNW WNW NE ENE NE NW TLD TLD TLD TLD TLD TLD TLD TLD TLD TLD TLD 4.7 Mi, NNW 0.8 Mi, E Onsite Onsite 0.3 Mi, N 0.6 Mi, N 0.5 Mi, NE Up-gradient of ISFSI Down-gradient of ISFSI Down-gradient of ISFSI Onsite Onsite Onsite Onsite Onsite Onsite Onsite Onsite 4 Mi, E Bottom Sediment Bottom Sediment Well Water Well Water TLD TLD TLD Well Water Well Water Well Water Well Water Well Water Well Water Well Water Well Water Well Water Well Water Well Water Fucus

Key:

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

- The release points are the MP1 stack for terrestrial locations and the quarry cut for aquatic locations.

2-3

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 2-2 Required Sampling Frequency & Type of Analysis Exposure Pathway No. of Sampling & Collection Type of Analysis and/or Sample Locations Frequency

1.

Gamma Dose 4-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 3

Semimonthly when animals are Gamma Isotopic and 1-131 on each on pasture; monthly at other sample; Sr-89 and Sr-go on times.

quarterly composite 5a.

Pasture Grass 3

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.

6a.

Well Water 2

Semiannual Gamma Isotopic and Tritium on each sample

7.

Bottom Sediment 5

Semiannual Gamma Isotopic on each sample 7a.

Soil 3

Annually Gamma Isotopic on each sample

8.

Fin Fish-Flounder 2

Quarterly Gamma Isotopic on each sample and one other type of edible fin fish

9.

Mussels 2

Quarterly Gamma Isotopic on each sample (edible portion)________

10.

Oysters 4

Quarterly Gamma Isotopic on each sample (edible portion)_______________

11.

Clams 2

Quarterly Gamma Isotopic on each sample (edible portion)_____

12.

Lobster 2

Quarterly Gamma Isotopic on each sample (edible portion)__

(a)

T wo or more I L~s or TILU withi two or more elements per location.

2-4

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Figure 2.1 Millstone Sampling Locations Long islanid Sound F#

TLD Monitoring (only)

TLD and Air Monitoring (particulates & iodine)

,l Terrestrial Monitoring (milk, grass, fruit & vebetables, soil, or leaves) 0 Aquatic Monitoring (seawater, sediment, flora, fish, mussel, oyster, clam, or lobster) 2-5

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Fiaure 2.2 Millstone Samolina Locations (Within 2 miles) 2-6

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 2.2 Samples Collected Durina Report Period The following table summarizes the number of samples of each type analyzed during 2007:

collected and Number of Number of Technical Technical Sample Type Specification Specification Number of Required Samples Required Samples Extra Samples Analyzed Analyzed Gamma Exposure 160 160 16 (Environmental TLD)

Air Particulates 416 416 0

Air Iodine 416 416 0

Soil 3

3 0

Goat Milk 54 81 0

Pasture Grass Variable 2 46 5

Fruit and Vegetables 8

8 1

Broad Leaf Vegetation 6

6 12 Sea Water 16 16 0

Well Water 4

4 40 Bottom Sediment 10 10 10 Aquatic Flora 0

0 24 Fish 16 143 4

Mussels 8

8 0

Oysters 16 16 5

Clams 8

8 11 Lobster 8

8 4

Total All Types 1,149 1,147 132 1

2 3

Pasture grass sampled as necessary to substitute for unavailable milk. Hay or grain was substituted when grass was not available.

Depends uponavailability of goat milk samples Due to sample unavailability, not all required fish samples could be obtained 2-7

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007

3.

RADIOCHEMICAL RESULTS 3.1 Summary Table In accordance with the Radiological Effluent Monitoring and Offsite Dose Calculation Manual (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.

The parentheses indicate the fraction of the measurements that are considered above the detection limit for each individual analysis.

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 are the results of special studies.

3-1

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD Type Total Mean Name Distance Mean No Range IDirectioni Range Page 1 of 16 TLD (uR/hr)

AP Gross Beta (le-3 pCi/m3)

Air Iodine (I e-3 pCi/m3)

AP Gamma (l e-3 pCi/m3)

Gamma Dose Gross Beta 1-131 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Mn-54 Nb-95 Ru-103 Ru-106 Zr-95 176 416 416 32 32 32 32 32 32 32 32 32 32 32 32 32 32 7.94 (156/156) 08 (4.5-12.7) 10 19.2 (363/364) 15-C (5.6-37.5) 70 (0/364)

(0/28) 117(20/28) 01 (66-178)

(0/28)

(0/28) 50 (0/28) 60 (0/28)

(0/28)

(0/28) 0.3 mi SE 14.0 mi N

0.6 mi NNW 11.5 (4/4)

(10.8-12.7) 20.1 (52/52)

(6.8-35.7)

< LLD

< LLD 136 (3/4)

(90-178)

< LLD

< LLD 8.21 (20/20)

(5.81-11.3) 20.1 (52/52)

(6.8-35.7)

(0/52)

(0/4) 109 (4/4)

(83-134)

(0/4)

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations Type Total Mean

-Name Distance Mean No Range Directioni Range Page 2 of 16 Soil (pCi/g dry)

Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 K-40 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 (0/2)

(0/2)

(0/2) 0.15 (0/2) 0.18 0.609 (2/2)

(0.568-0.65)

(0/2) 10.6 (2/2)

(10.2-11)

(0/2)

(0/2) 0.94 (2/2)

(0.8-1.08)

(0/2)

(0/2) 14-C 14-C 14-C

< LLD

< LLD 12.0 mi 1.21(1/1)

NE (1.21-1.21)

< LLD 12.0 mi 12(1/1)

NE (12-12)

< LLD

< LLD 12.0 mi 1.17 (1/1)

NE (1.17-1.17)

< LLD

< LLD (0/1)

(0/1)

(0/1) 1.21 (1/1)

(1.21-1.21)

(0/1) 12 (1/1)

(12-12)

(0/1)

(0/1) 1.17 (1/1)

(1.17-1.17)

(0/1)

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD I

Type Total Mean Name Distance Mean No Range I Directioni Range Page 3 of 16 Goat Milk (pCi/L)

Pasture Grass (Hay)

(pCi/g wet)

Ba-140 Cs-134 Cs-137 1-131 K-40 La-140 Sr-89 Sr-90 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 8

8 8

8 2

2 51 51 51 51 51 51 51 51 51 70 (0/5) 15 (0/5) 18 (0/5) 1 (0/5) 1143 (5/5)

(760-1650) 25 (0/5)

(0/1)

(0/36) 24-C 24-C

< LLD

< LLD 29.0 mi 7.7(1/3)

NNW (7.7-7.7)

< LLD 29.0 mi 1330 (3/3)

NNW (910-1590)

< LLD

< LLD 2.7 mi 1.81 (10/18)

NE (0.5-3.74)

< LLD

< LLD 2.7 mi 0.074 (1/18)

NE (0.074-0.074)

< LLD (0/3)

(0/3) 7.7 (1/3)

(7.7-7.7)

(0/3) 1330 (3/3)

(910-1590)

(0/3)

(0/1)

(0/15) 1.32 (11/15)

(0.37-6.6)

(0/15)

(0/15) 1.35 (18/36)

(0.44-3.74)

(0/36)

(0/36) 0.074 (1/36)

(0.074-0.074)

(0/36) 22 0.06 0.08 22

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD Type Total Mean Name Distance Mean No Range IDirectioni Range Page 4 of 16 Pasture Grass (Hay)

(pCi/g wet) 1-131 51 0.06 (0/36)

< LLD (0/15)

K-40 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 Ba-140 Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 51 51 51 51 51 51 51 51 51 51 44 44 44 44 44 44 44 7.75 (36/36)

(3.64-22.9)

(0/36)

(0/36) 0.2 (2/36)

(0.18-0.22)

(0/36)

(0/36) 60 (0/44)

(0/44) 15 (0/44) 15 (0/44)

(0/44) 15 (0/44) 18 (0/44) 21 22 2.0 mi 8.77 (18/18)

N (3.64-22.9)

< LLD

< LLD 2.7 mi 0.2(2/18)

NE (0.18-0.22)

< LLD

< LLD 7.78 (15/15)

(4.17-15)

(0/15)

(0/0)

Well Water (pCi/L)

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

-L Locations Type Total Mean Name Distance Mean No Range Directioni Range Page 5 of 16 Well Water (pCi/L)

Fruits &

Vegetables (pCi/g wet)

Fe-59 H-3 1-131 K-40 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 Ba-140 Be-7 Ce-141 Ce-144 Co-58 44 44 44 44 44 44 44 44 44 44 44 44 44 9

30 (0/44) 2000 (0/44) 15 (0/44) 92 (1/44)

(92-92) 15 (0/44) 15 (0/44) 15 (0/44)

(0/44)

(0/44) 15 (1/44)

(15-15) 30 (0/44) 30 (0/44)

(0/5) 79

< LLD

< LLD 92 (1/5)

(92-92)

< LLD

< LLD 15 (1/3)

(15-15)

< LLD

< LLD (0/0)

(0/0)

(0/4)

(0/4) 84 9

9 9

9 0.151,(1/5)

(0.151-0.151)

(0/5)

(015) 25 10- mi 0.151(1/5)

(0.151-0.151)

< LLD

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

L Locations LLD Type Total Mean Name Distance Mean No Range I Direction Range Page 6 of 16 Fruits &

Vegetables (pCi/g wet)

Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 9

(0/5)

< LLD (0/4)

(0/5) 0.06 (0/5) 0.08 (0/5)

(0/5) 0.06 (0/5) 2.57 (5/5)

(1.17-4.6)

(0/5)

(0/5) 25

~

< LLD

< LLD 10- mi 2.57(5/5)

(1.17-4.6)

< LLD

< LLD (0/4)

(0/4)

(0/4) 2.1 (4/4)

(1.14-3.06)

(0/4)

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD Type Total Mean Name Distance Mean No Range Directioni Range Page 7 of 16 Broadleaf Vegetation (pCi/g wet)

Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 La-140 Mn-54

\\Nb-95 Ru-103 Ru-106 Sb-125 18 (0/18)

< LLD 1.1 (10/18)

(0.52-3.55)

(0/18)

(0/18) 0.06 (0/18) 0.08 (0/18)

(0/18) 0.06 (0/18) 3.23 (18/18)

(2.26-4.42)

(0/18)

(0/18) 01 0.6 mi 1.47 (4/6)

NNW (0.63-3.55)

< LLD

~<LLD

< LLD

< LLD 1.2 mi 3.78(6/6)

E (3.39-4.42)

< LLD

< LLD (0/0)

(0/0)

(0/0) 10

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD Type Total '

Mean Name Distance Mean No Range Directions Range Page 8 of 16 Broadleaf Vegetation (pCi/g wet)

Sea Water (pCi/L)

Th-228 Zn-65 Zr-95 Ba-140 Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 H-3 1-131 K-40 La-140 Mn-54 Nb-95 Ru-103 0.165 (1/18)

(0.165-0.165)

(0/18)

(0/18) 60 (0/12)

(0/12) 15 (0/12) 15 (0/12)

(0/12) 15 (0/12) 18 (0/12) 30 (0/12) 2000 910 (5/12)

(340-1940) 15 (0/12) 290 (12/12)

(175-410) 15 (0/12) 15 (0/12) 15 (0/12)

(0/12) 17 0.5 mii 0.165 (1/6)

NE (0.165-0.165)

< LLD

< LLD 910 (5/12)

(340-1940)

< LLD 290 (12/12)

(175-410)

< LLD

< ITLD (0/0)

(0/0)

(0/4)

(0/4) 300 (1/4)

(300-300)

(0/4) 263 (4/4)

(205-315)

(0/4)

(0/0) 32 32

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations Type Total Mean Name Distance Mean No Range Directions Range Page 9 of 16 Sea Water (pCi/L)

Bottom Sediment (pCi/g dry)

Ru-106 Sb-125 Th-228 Zn-65 Zr-95 Ag-110m Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 Ru-103 Ru-106 16 16 16 16 16 20 20 20 20 20 20 20 20 20 20 20 20 20 20 (0/12)

(0/12) 14.7 (1/12)

(14.7-14.7) 30 (0/12) 30 (0/12)

(0/18)

(0/18) 0.15 (0/18) 0.18 0.165 (1/18)

(0.165-0.165)

(0/18)

(0/18) 15.4 (18/18)

(12.1-20.3)

(0/18)

(0/18) 32 67-X 39-X

< LLD

< LLD 14.7 (1/12)

(14.7-14.7)

< LLD

<LLD" 4.7 mi 0.165(1/2)

NNW (0.165-0.165)

< LLD

< LLD 0.8 mi 18.1 (2/2)

NE (15.8-20.3)

< LLD

< LLD (0/4)

(0/4)

(0/2)

(0/2) 14.9 (2/2)

(14.5-15.2)

(0/2)

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD Type Total Mean Name Distance Mean No Range Direction Range Page 10 of 16 Bottom Sediment (pCi/g dry)

Aquatic Flora (pCi/g wet)

Sb-125 Th-228 Zn-65 Zr-95 Ag-110m Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 20 20 20 20 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 (0/18) 0.859 (13/18) 29 (0.4-1.56)

(0/18)

(0/20) 0.213 (3/20) 90-(0.18-0.24)

(0/20)

(0/20) 90-5.41 (20/20) 32-(3.77-7.43)

(0/20)

C

< LLD 0.4 mi 1.05 (2/2)

NNE (0.9-1.2)

< LLD

< LLD 4.2 mi 0.36 (1/4)

ENE (0.36-0.36)

< LLD

< LLD 4.2 mi 0.046(1/4)

ENE (0.046-0.046) 5.99(4/4)

(4.97-7.43)

< LLD

< LLD (0/2) 0.27 (1/2)

(0.27-0.27)

(0/2)

(0/4) 0.36 (1/4)

(0.36-0.36)

(0/4)

(0/4) 0.046 (1/4)

(0.046-0.046) 4.95 (4/4)

(4.22-6.65)

(0/4)

C x

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean LL Locations LLD Type Total Mean Name Distance Mean No Range Direction Range Page 11 of 16 Aquatic Flora (pCi/g wet)

Fish-Flounder (pCi/g wet)

Th-228 Zn-65 Zr-95 Ag-110m Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 0.067 (4/20)

(0.056-0.074)

(0/20)

(0/8)

(0/8) 0.13 (0/8) 0.13 (0/8)

(0/8) 0.13 (0/8) 0.15 (0/8) 0.26 (0/8)

(0/8) 3.63 (8/8)

(3.26-4.25) 0.13 (0/8)

(0/8)

(0/8) 35-X 0.3 mi 0.074(1/4)

WNW (0.074-0.074)

< LLD

< LLD 3.72 (4/4)

(3.26-4.25)

< LLD

< LLD (0/4)

(0/4)

(0/0)

(0/0) 32

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

L Locations Type TotaI LLD Mean Name Distance Mean No Range Direction Range Page 12 of 16 Fish-Flounder (pCi/g wet)

Fish-Other (pCi/g wet)

Zn-65 Zr-95 Ag-110m Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 8

8 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 0.26 (0/8)

(0/8)

(0/10)

(0/10) 0.13 (0/10) 0.13 (0/10)

(0/10) 0.13 (0/10) 0.15 (0/10) 0.26 (0/10)

(0/10) 3.64 (10/10)

(2.7-4.5) 0.13 (0/10)

(0/10)

(0/10) 0.26 (0/10)

< LLD

< LLD 3.73 (3/3)

(3.3-4.3)

< LLD

< LLD (0/0)

(0/0)

(0/0) 40-X

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD Type Total Mean Name Distance Mean No Range Direction Range Page 13 of 16 Fish-Other (pCi/g wet)

Mussels (pCi/g wet)

Zr-95 Ag-Il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 (0/10)

(0/8)

(0/8) 0.13 (0/8) 0.13 (0/8)

(0/8) 0.13 (0/8) 0.15 (0/8) 0.26 (0/8)

(0/8) 1.93 (7/8)

(1.27-2.35) 0.13 (0/8)

(0/8)

(0/8) 0.26 (0/8)

(0/8)

< LLD

< LLD S-

< LLD

< LLD 30 1.5 mi 1.97 (4/4)

NNW (1.83-2.29)

< LLD

< LLD (0/0)

(0/0)

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD Type Total '

Mean Name Distance Mean No Range Directioni Range Page 14 of 16 Oysters (pCi/g wet)

Ag-il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 0.064 (2/17)

(0.058-0.069)

(0/17) 0.13 (0/17) 0.13 (0/17)

(0/17) 0.13 (0/17) 0.15 (0/17) 0.26 (0/17)

(0/17) 1.85 (17/17)

(1.36-2.55) 0.13 (0/17)

(0/17)

(0/17) 0.26 (0/17)

(0/17) 40-X 0.064 (2/2)

(0.058-0.069)

< LLD

< LLD 3.5 mi 2.21 (4/4)

WSW (1.86-2.53)

< LLD

< LLD 7-

< LLD

< LLD (0/4)

(0/4)

(0/4) 2.21 (4/4)

(1.86-2.53)

(0/4)

(0/4) 37-C

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations LLD Type Total Mean Name Distance Mean No Range IDirection Range Page 15 of 16 Clams (pCi/g wet)

Ag-il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 (0/19)

(0/19) 0.13 (0/19) 0.13 (0/19)

(0/19) 0.13 (0/19) 0.15 (0/19) 0.26 (0/19)

(0/19) 2.06 (19/19)

(1.42-2.98) 0.13 (0/19)

(0/19)

(0/19) 0.26 (0/19)

(0/19)

< LLD

< LLD 2.23 (4/4)

(1.98-2.63)

< LLD

< LLD (0/0)

(0/0)

(0/0) 38 1.0 mi NW

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean 1

L Locations Type Total Mean Name Distance Mean No Range I Direction Range Page 16 of 16 Lobsters (Crabs)

(pCi/g wet)

Ag-110m Be-7 Co-58 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 (0/12)

(0/12) 0.13 (0/12) 0.13 (0/12)

(0/12) 0.13 (0/12) 0.15 (0/12) 0.26 (0/12)

(0/12) 2.39 (12/12)

(1.66-3.2) 0.13 (0/12)

(0/12)

(0/12) 0.26 (0/12)

(0/12)

< LLD

< LLD 2.54 (4/4)

(2.15-2.93)

< LLD

< LLD (0/0)

(0/0)

(0/0) 32

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 NOTES FOR

SUMMARY

TABLE For gamma measurements the Minimum Detectable Level (MDL) -

the Lower Limit of Detection (LLD) / 2.33. For all others, MDL = 2 x (the standard deviation of the background).

These MDLs are based on the absence of large amounts of interfering activity (excluding naturally occurring radionuclides).

Deviations by factors of 3 to 4 can occur.

I 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)

where, 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 shall be performed in such a manner that the stated LLDs will be achieved under routine conditions. Occasionally background fluctuations, unavoidably small sample sizes, the presence of interfering nuclides, or other uncontrollable circumstances may render these a priori LLDs unachievable.

In such cases, the contributing factors will be identified and described in the Annual Radiological Environmental Operating 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.

The listed 1-131 LLD for all the vegetation samples is for leafy vegetables.

The 1-131, Ba-1 40 and La-1 40 LLDs for the water samples are from end of sample period.

3-18

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 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 2c error (i.e., the measured-value exceeds 3y). 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, Weekly 1-131

4. Air Particulates, Quantitative Gamma Spectra

5. Air Particulates, Quarterly Strontium*

6. Soil

7.

Milk - Dairy Farms*

8.

Milk - Goat Farms

9. Pasture Grass

10. Well Water

11. Reservoir Water*

12. Fruits & Vegetables

13. Broad Leaf Vegetation

14. Seawater

15. Bottom Sediment

16. Aquatic Flora

17. Fin Fish

18. Mussels

19. Oysters

20. Clams

21. Scallops*

22. Lobster (and Crabs)

This type of sampling or analysis was not performed; therefore there is no table for these.

3-19

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 1, Quarterly TLD Gamma Exposure Rate (uRlhr)

Page 1 of 2 Location First Second Third Fourth Average Number Quarter Quarter Quarter Quarter

+/- 2 s.d.

01 02 03 04 05 06 07 08 09 10 11I 1 2-C 13-C 14-C 15-C 16-C 27 41 42 43 44 45 46 47 48 49 50 51 52 53 55 56 57 59 60 61 62 63 64 65 66-X 73-X 7.81 +/- 0.26 9.45 +/- 0.31 6.06 +/- 0.25 7.87 +/- 0.25 8.82 +/- 0.29 8.11 +/- 0.30 5.69 +/- 0.17 10.95 +/- 0.40 8.47 +/- 0.20 9.55 +/- 0.32 6.38 +/- 0.22 6.87 +/- 0.25 10.04 +/- 0.29 8.95 +/- 0.24 7.38 +/- 0.28 6.05 +/- 0.39 8.41 +/- 0.27 6-.65 +/- 0.20.

7.65 +/- 0.23 6.36 +/- 0.31 7.83 +/- 0.26 6.83 +/- 0.41 7.97 +/- 0.32 7.21 +/- 0.22 9.05 +/- 0.50 6.81 +/- 0.22 7.83 +/- 0.35 6.24 +/- 0.23 6.94 +/- 0.23 6.97 +/- 0.22 7.35 +/- 0.30 6.44 +/- 0.19 7.17 +/- 0.30 7.39 +/- 0.31 6.88 +/- 0.44 7.30 +/- 0.33 8.06 +/- 0.22 8.23 +/- 0.33 7.07 +/- 0.37 7.88 +/- 0.33 6.58 +/-L 0.33 8.97 +/- 0.20 7.70:f- 0.27 9.45 z+/- 0.21 6.66 +L 0.25 7.83 +/-E 0.31 8.76 + 0.25 7.45 + 0.31 4.50 +/- 0.24 10.83 +/- 0.23 8.79 +/- 0.31 8.95 +/- 0.24 6.34 +/- 0.21 6.90 +/- 0.24 9.61 :+0.40 9.02 +/- 0.35 7.01 +/- 0.21 5.81 +/-+0.16 8.30 +/-0.16 6.31 +/- 0.19 7.61 +/- 0.20 6.61 +/- 0.24 8.86 +/- 0.30 6.73 +/- 0.28 7.31 +/- 0.22 7.40 +/- 0.39 9.32 +/- 0.31 6.80 +/- 0.20 7.79 +/- 0.28 6.24 +/- 0.13 7.05 +/- 0.18 6.91 +/- 0.25 6.93 +/- 0.35 6.11 +/- 0.19 6.97 +/-0.15 7.42 +/- 0. 15 6.65 +/- 0.38 7.16 +/- 0.20 7.80 +/- 0.44 8.44 +/- 0.17 7.00 +/- 0.28 7.34 +/- 0.34 7.13 +/- 0.32 9.62 +/- 0.21 8.80 +/- 0.31 10.25 +/- 0.39 6.31 +/- 0.38 8.59 +/- 0.27 9.48 +/- 0.35 7.72 +/- 0.46 4.99 +/- 0.41 11.46 +/- 0.90 9.06 +/- 0.66 9.84 +/- 0.39 7.03 +/- 0.31 7.48 +/- 0.22 10.34 +/- 0.77 9.19 +/- 1.06 8.43 +/- 0.54 6.30 +/- 0.45 8.44 +/- 0.45 6.81 +/- 0.33 7.68 +/- 0.38 6.65 +/- 0.51 8.18 +/- 0.56 7.41 +/- 0.24 7.84 +/- 0.37 7.81 +/- 0.27 9.37 +/- 0.51 6.70 +/- 0.29 7.63 +/- 0.50 6.40 +/- 0.47 7.32 +/- 0.22 7.66 +/- 0.25 7.81 +/- 0.38 7.11 +/- 0.40 8.06 +/- 0.46 8.57 +/- 0.54 6.89 +/- 0.58 7.24 +/- 0.35 8.14 +/- 0.44 9.67 +/- 0.49 7.48 +/- 0.26 8.14 +/- 0.35 6.97 +/- 0.39 9.15 +/- 0.32 9.36 +/- 0.51 11.05 +/- 0.44 7.69 +/- 0.37 9.29 +/- 0.68 10.68 +/- 0.64 9.16 +/- 0.56 5.93 +/- 0.32 12.66 +/- 0.56 10.22 +/- 0.45 10.80 +/- 0.41 8.15 +/- 0.32 8.16 +/- 0.32 11.25 +/- 0.48 10.16 +/- 0.39 8.27 +/- 0.69 7.04 +/- 0.29 9.15 +/- 0.38 7.33 +/- 0.32 8.88 +/- 0.39 7.70 +/- 0.35 8.62 +/- 0.45 8.23 +/- 0.34 8.66 +/- 0.43 8.77 +/- 0.33 10.68 +/- 0.65 7.86 +/- 0.31 8.47 +/- 0.34 7.03 +/- 0.34 8.01 +/- 0.32 8.32 +/- 0.34 8.35 +/- 0.36 7.70 +/- 0.30 8.00 +/- 0.41 8.90 +/- 0.47 7.55 +/- 0.34 7.97 +/- 0.45 8.70 +/- 0.59 9.51 +/- 0.37 8.08 +/- 0.37 8.94 +/- 0.42 7.81 +/- 0.37 9.78 +/- 0.50 8.42 +/- 1.39 10.05 +/- 1.33 6.68 +/- 1.24 8.40++/- 1.20 9.44++/-1.54 8.11 +/- 1.30 5.28 +/- 1.13 11.48 +/-1.45 9.14 +/- 1.32 9.79 +/- 1.34 6.98 +/- 1.46 7.35 +/- 1.05 10.31 +/- 1.20 9.33 +/- 0.97 7.77 +/- 1.19 6.30 +/- 0.92 8.58 +/- 0.67 6.78 +/- 0.74 7.96 +/- 1.07 6.83 +/- 1.03 8.37 +/- 0.79 7.30 +/- 1.19 7.95 +/- 0.96 7.80 +/- 1.20 9.61 +/- 1.26 7.04 +/- 0.95 7.93 +/-E 0.64 6.48 +/- 0.65 7.33 +/- 0.83 7.47 +/- 1.15 7.61 +/- 1.06 6.84 +/- 1.23 7.55 +/- 0.97 8.07 +/- 1.35 6.99 +/- 0.67 7.42 +/- 0.65 8.18 +/- 0.66 8.96 +/- 1.27 7.41 +/- 0.86 8.08 +/- 1.15 7.12 +/- 0.89 9.38 +/- 0.66

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 1, Quarterly TLD Gamma Exposure Rate (uR/hr)

Page 2 of 2 Location First Second Third Fourth Average Number Quarter Quarter Quarter Quarter

+/- 2 s.d.

74-X 75-X 7.19 + 0.22 6.68 +/- 0.25 7.77 +/- 0.22 6.96 +/- 0.16 7.89 + 0.23 7.17+0.33 8.40 +/- 0.36 8.08 + 0.31 7.81 + 0.86 7.22 + 1.05

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 2, Air Particulate Gross Beta Radioactivity (le-3 pCi/m3)

Page 1 of 4 Collection Date Locations JANUARY 01/01 -01/07 01/08 - 01/14 01/15 - 01/21 01/22 - 01/28 FEBRUARY-01/29 - 02/04 02/05 - 02/11 02/12 - 02/18 02/19 - 02/25 MARCH 02/26 - 03/04 03/05 - 03/11 03/12 - 03/18 03/19 - 03/25 Qtr Avg 4: 2 sd JANUARY 01/01 - 01/07 01/08 - 01/14 01/15 - 01/21 01/22 - 01/28 FEBRUARY-01/29 - 02/04 02/05 - 02/11 02/12 - 02/18 02/19 - 02/25 MARCH 02/26 - 03/04 03/05 - 03/11 03/12 - 03/18 03/19 - 03/25 01 10.9 +/- 3.6 16.7 +/- 3.9 23.3 +/- 4.1 24.7 +/- 4.1 01 28.9 +/- 4.4 22.8 +/- 5.9 19.2 +/-4.2 14.5 +/- 5.4 01 13.7 +/- 5.2 26.1 +/-4.1 21.8 +/- 4.2 18.8 +/-4.4 20.1 +/- 10.4 15-C 14.3 + 4.3 15.5 + 4.2 22.9 +/- 4.5 25.5 +/- 3.8 15-C 33.3 +/- 4.3 11.3 +/- 4.7 19.9 +/- 3.8 13.9 +/- 5.0 15-C 13.4 +/- 4.8 27.7 +/- 3.9 20.1 +/- 3.8 20.7 +/- 4. 1 02 12.0 +/-3.2 15.0 +/- 3.2 20.3 +/- 3.3 22.0 +/- 3.4 02 29.8 +/- 3.7 23.4 +/- 4.9 21.0 +/- 3.5 13.1 +/- 4.8 02 12.5 +/- 4.7 25.0 +/- 3.7 15.7 +/- 3.6 16.0 +/- 3.9 18.8 +/- 10.8 27 13.4 +/- 3.7 14.4 +/- 3.7 24.4 +/- 4. 1 25.9 +/- 4. 1 27 28.6 +/- 4.3 21.9++/-5.8 18.3 +/- 4.1 19.9 +/- 5.7 27 16.3 +/- 5.4 27.1 +/- 4.2 17.4 +/- 4.0 17.6 +/- 4.4 20.4 +/- 9.7 1 03 10.8 +/- 3.6 16.0 +/- 3.8 22.5 +/- 4.0 26.5 + 4.1 03 27.5 +/- 4.3 15.3 +/- 5.4 22.4 +/-14.2 14.1 +/- 5.3 03 14.9 +/- 5.2 23.2 +/- 3.9 17.9 +/- 3.9 19.1 +/- 4.3 19.2++/- 10.0 04 10.2 +/- 4.2 19.3 +/-+4.5 29.2 +/- 4.9 23.2 +/- 4.7 04 28.2 +/- 5.0 21.7 +/- 5.6 20.3 +/- 4.0 15.0 +/- 5.2 04 17.4++/- 5.3 29.0 +/- 4. 1 16.8 +/- 3.8 21.7 +/- 4.4 21.0 +/- 11.2 10 9.9 +/- 3.4 16.7 +/-L'3.7 23.4 + 3.9 26.5 +/- 4.0 10 29.1 +/-+4.3 18.3 +/- 5.4 21.2 +/- 4.0 14.5 + 5.1 10 13.8 +/- 5.0 27.5 +/- 4.0 18.1 +/- 3.8 24.3 +/-+4.3 20.3++/-11.5 11 12.2 + 3.8 15.0 +/- 3.9 22.6 + 4.2 27.8 +/- 4.4 11 29.6 + 4.7 18.6 + 6.0 21.5 + 4.5 21.9 +/- 6.2 11 18.8 +/- 5.9 28.4 +/- 4.4 17.0 +/- 4.2 18.6 +/- 4.7 21.0++/- 10.4 Qtr Avg =L 2 sd 19.9 +L 12.7

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 Table 2, Air Particulate Gross Beta Radioactivity (le-3 pCi/m3)

Page 2 of 4 Collection Locations Date APRIL 01 02 03 04 10 11 03/26 - 04/01 12.5 +/- 3.6 10.3 +/- 3.1 15.2 + 3.6 14.0 +/- 3.6 15.8 +/- 3.5 16.8 + 3.9 04/02 - 04/08 9.1 + 3.6 6.6 + 3.0 8.4 +/- 3.5 5.6 +/- 3.3 5.9 +/- 3.1 6.8 +/- 3.6 04/09 - 04/15 8.5 + 3.4 6.9 +/- 2.8 9.4 +/- 3.4 11.3 +/- 3.5 6.8 +/- 3.1 5.8 + 3.5 04/16 - 04/22 17.1 +/- 4.2 10.4 + 3.1 14.8 +4.0 15.5 +/-4.0 13.8 +/- 3.8 13.2 +4.1 04/23 - 04/29 8.7 +/- 3.4 11.5 +/- 2.9 10.1 + 3.5 14.8 + 3.8 12.5 +/- 3.4 13.7 +/- 3.8 MAY 01 02 03 04 10 11 04/30 - 05/06 14.7 +/- 3.9 10.8 +/- 3.3 12.1 +/- 3.7 11.8 + 3.8 13.2 +/- 3.6 13.2 +/- 4.0 05/07 - 05/13 8.6 + 3.4 9.4 + 3.1 7.3 +/- 3.4 9.8 +/- 3.5 8.7 +/- 3.2 8.7 +/- 3.6 05/14 - 05/20 7.1 +/- 3.9 7.2 + 3.2 8.7 + 4.0 5.0 + 3.8 5.8 + 3.6 6.8 + 4.0 05/21 - 05/27 23.8 +4.3 25.1 : 3.9 23.9 +/-4.3 23.4 +4.3 25.6 +4.1 27.2 +/-4.5 JUNE 01 02 03 04 10 11 05/28 - 06/03 20.5 +/- 4.0 17.7 +/- 3.5 22.2 +/- 4.1 18.0 +/- 3.8 20.2 +/- 3.7 21.6 +/- 4.2 06/04 - 06/10 16.0 +/- 3.9 12.5 +/- 3.3 14.8 +/- 3.8 14.8 +/- 3.8 15.8 +/- 3.6 14.4 +/- 3.9 06/11 - 06/17 14.5 +/- 3.7 15.6 +/- 3.2 15.1 +/- 3.6 14.2 : 3.6 12.8 +/- 3.3 17.6 +/- 3.9 06/18 - 06/24 11.3 +/- 3.8 14.6 +/- 3.4 15.4 +/- 3.9 14.5 +/- 3.9 13.6 +/- 3.5 12.2 +/- 3.9 Qtr Avg ý= 2 sd 13.3 +/-9.8 12.2+/-9.9 13.6+/-9.8 14.0+/-8.3 13.1 + 10.9 13.7+/- 11.8 APRIL 15-C 27 03/26 - 04/01 17.3 3.4 14.3 3.7 04/02 - 04/08 6.8 + 3.0 7.9 + 3.5 04/09 - 04/15 10.8 + 3.3 7.4 +/- 3.4 04/16 - 04/22 16.7 3.8 15.2 +/-4.1 04/23 - 04/29 7.6 3.1 11.7 3.7 MAY 15-C 27 04/30 - 05/06 13.0 3.5 13.1 3.5 05/07 - 05/13 8.1 3.1 9.9 3.2 05/14 - 05/20 7.1 + 3.5 7.7 + 3.6 05/21 - 05/27 24.2 +/- 4.0 23.3 + 3.9 JUNE 15-C 27 05/28 - 06/03 22.7 +/- 3.7 22.5 +/- 3.8 06/04 - 06/10 18.5 +/- 3.6 15.7 +/- 3.5 06/11 - 06/17 15.3 +/-4.8 A

15.3 +/- 3.3 06/18 - 06/24 15.0 +/- 3.5 14.7 +/- 3.6 Qtr Avg::L2 sd 14.1 +/- 11.2 13.7 +/-9.7

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 2, Air Particulate Gross Beta Radioactivity (le-3 pCi/m3)

Page 3 of 4 Collection Date Locations JULY 06/25 - 07/01 07/02 - 07/08 07/09 - 07/15 07/16 - 07/22 07/23 - 07/29 AUGUST 07/3 0 - 08/05 08/06 - 08/12 08/13 - 08/19 08/20 - 08/26 SEPTEMBER 08/27 - 09/02 09/03 - 09/09 09/10 - 09/16 09/17 - 09/23 09/24 - 09/3 0 Qtr Avg +/- 2 sd JULY 06/25 - 07/01 07/02 - 07/08 07/09 - 07/15 07/16 - 07/22 07/23 - 07/29 AUGUST 07/30 - 08/05 08/06 - 08/12 08/13 - 08/19 08/20 - 08/26 SEPTEMBER 08/27 - 09/02 09/03 - 09/09 09/10 - 09/16 09/17 - 09/23 09/24 - 09/3 0 Qtr Avg +/- 2 sd 01 21.2 +/-+4.3 23.8 +/- 4.4 24.2 +/- 4.5 17.9 +/- 4.3 19.1 +/- 4.3 01 35.5 +/- 5.0 25.9 +/- 4.6 17.0 +/- 4.2 17.2 +/- 3.6 01 23.0 +/- 4.2 23.7 +/- 4. 1 20.3 +/- 5.4 21.0 +/- 4.0 27.8 +/- 4.4 22.7 +/- 9.5 15-C 18.9 +/- 3.7 24.2 +/- 4.0 22.0 +/- 4.0 16.2 +/- 3.8 22.9 +/- 4.2 15-C 32.0 +/- 4.4 26.4 +/- 4.2 20.6 +/- 3.9 16.6 +/- 3.6 15-C 28.9 +/- 4.5 24.7 +/- 4.2 14.6 +/- 5.0 25.1++/-4.0 34.3 +/- 6.6 23.4 +/- 11.3 02 18.2 +/- 3.6 16.5 +/- 3.5 17.5 +/- 3.5 16.5 +/- 3.5 15.2 +/- 3.4 02 25.8 +/- 3.9 15.8 +/- 3.4 21.6 +/- 3.6 12.9 +/- 3.1 02 24.2 +/- 3.9 14.8 +/- 3.4 17.0 +/- 4.6 13.9 +/- 5.0 22.6 +/- 4.9 18.0 +/- 7.7 03 19.8 +/- 4.1 23.2 +/- 4.4 20.2 +/- 4.3 21.3 +/- 4.3 21.7 +/- 4.4 03 30.7 +/- 4.7 25.9 +/- 4.5 17.0 +/- 4. 1 16.4 +/- 3.5 03 24.1 + 4.1 22.7 +/- 4.0 15.2 +/- 4.8 25.1 +/- 4.0 23.9 + 4.1 21.9++/-8.0 04 22.5 +/- 4.3 22.6 +/- 4.3 20.7 +/- 4.2 19.6 +/- 4.2 19.8 +/- 4.3 04 32.4 +/- 4.8 24.8 +/- 4.3 21.8 +/- 4.3 17.8 + 3.9 04 27.5 + 4.8 18.1 +/- 4.2 16.6 +E 5.5 19.8 +/- 4.2 20.5 + 4.4 21.8 +/-8.1 10 18.4 +/- 3.8 22.9 + 4.0 20.8 +/- 4.0 19.6 +/- 4.0 24.8 +/- 4.2 10 31.1 +/- 4.4 24.4 +/- 4.1 17.2 + 3.7 20.6 +/- 3.8 10 1

28.6 +/- 4.5 25.6 + 4.2 14.0 +/- 5.0 19.1 + 3.6 23.0 +/- 4. 1 22.2 +/- 8.8 11 19.9 +/- 4.3 21.6 +/- 4.4 20.0 + 4.4 16.6 +/- 4.3 19.9 +/- 4.5 11 32.8 +/- 4.5 25.7 +/- 4.1 17.6 +/- 3.6 16.6 +/- 3.5 11 26.6 +/-4.2 22.3 +4.0 17.1+/-5.0 21.3 +/-3.9 23.7 +/-4.1 21.6+/- 8.7 B

C 27 18.7 +/-L 3.8 19.9 +/- 3.8 19.8 +/- 3.9 17.8 +/- 3.8 15.4 +/- 3.7 27 30.0 + 4.3 20.4 +/- 3.8 20.2 +/-L 3.8 15.4 +/- 3.5 27 27.6 +/- 4.3 19.6 +/- 3.9 15.3 + 4.9 18.0 +/- 3.8 D

19.3++/-3.9 19.8 + 8.2

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 Table 2, Air Particulate Gross Beta Radioactivity (le-3 pCi/m3)

Page 4 of 4 Collection Locations Date OCTOBER 01 02 03 04 10 11 10/01 - 10/07 14.1 +/- 4.1 16.9 +/- 3.6 16.7 +/- 4.0 16.4 +/- 4.4 18.3 +/- 4.1 13.3 +/- 3.9 10/08 - 10/14 12.7 +/-4.8 11.7+/--4.8 E

11.8 +/-4.9 11.1 +/-5.0 10.5 +/-5.1 11.8+/-5.2 10/15 - 10/21 33.3 +/- 4.7 29.4 +/- 4.7 32.0 +/- 4.7 32.8 +/- 5.0 37.5 +/- 5.1 36.0 +/- 5.2 10/22 - 10/28 19.1 +/- 5.4 18.4 +/- 5.2 19.0 +/- 5.4 17.6 +/- 5.5 18.4 +/- 5.7 22.0 +/- 6.0 NOVEMBER 01 02 03 04 10 11 10/29 - 11/04 30.4 +/- 3.8 25.7 +/- 3.7 27.7 +/- 3.7 26.2 +/- 3.9 30.3 +/- 4.0 28.0 +/- 4.0 11/05 - 11/11 20.1 +/- 3.5 19.9 +/- 3.6 17.0 +/- 3.4 21.5 +/- 3.7 20.0 +/- 3.7 23.3 +/- 3.9 11/12 - 11/18 22.5 +/- 3.4 23.0 +/- 3.5 23.0 +/- 3.5 24.1 +/- 3.7 20.2 +/- 3.6 20.9 +/- 3.7 11/19 - 11/25 22.9 +/- 4.1 18.8 +/- 4.0 21.2 +/- 4.0 19.1 +/- 4.1 24.4 +/- 4.4 22.8 +/- 4.4 DECEMBER 01 02 03 04 10 11 11/26 - 12/02 24.5 +/- 4.1 17.0 +/- 3.9 20.2 +/- 3.9 20.3 +/- 4.2 23.3 +/- 4.3 18.5 +/- 4.2 12/03 - 12/09 18.7 +/- 3.9 19.3 +/- 4.0 18.8 +/- 3.9 19.7 +/- 4.1 16.7 +/- 4.0 19.3 +/- 4.2 12/10 - 12/16 25.3 +/- 3.7 23.2 +/- 3.8 24.7 +/- 3.7 25.5 +/- 3.9 24.0 +/- 3.9 25.8 +/- 4.0 12/17 - 12/23 24.7 +/- 4.8 22.8 +/- 4.9 29.9 +/- 5.2 28.9 +/- 5.4 27.4 +/- 5.2 23.9 +/- 5.2 12/24 - 12/30 21.7 +/- 3.9 20.3 +/- 3.9 19.3 +/- 3.7 23.9 +/- 4.1 22.3 +/- 4.0 27.0 +/- 4.3 Qtr Avg + 2 sd 22.3 +/- 11.0 20.5 +/- 8.5 21.6 +/- 10.9 22.1 +/- 10.9 22.6 +/- 12.9 22.5 +/- 12.1 AnnAvg+2 sd 19.6+/- 12.7 17.4+/-11.1 19.2+/- 11.8 19.8+/- 11.7 19.6+/- 13.5 19.7+/- 12.9 OCTOBER 15-C 27 10/01 - 10/07 15.2 4.9 15.8 +/- 4.0 10/08 - 10/14 12.3 4.9 11.7 +/- 5.0 10/15 - 10/21 35.7 +/-:4.6 28.3 +/-4.8 10/22 - 10/28 19.6 +/- 5.1 15.8 +/- 5.4 NOVEMBER 15-C 27 10/29 - 11/04 32.1 +/- 3.8 28.7 +/- 4.0 11/05 - 11/11 19.6 +/- 3.3 20.1 +/-3.6 11/12 - 11/18 25.0 +/- 3.4 24.9 +/- 3.7 11/19 - 11/25 17.5 +/- 3.7 22.6 +/- 4.2 DECEMBER 15-C 27 11/26 - 12/02 21.7 +/- 3.9 22.7 +/-4.2 12/03-12/09 20.6 +/- 3.8 20.1 +/-4.1 12/10 - 12/16 28.4 +/- 4.0 23.2 +/- 3.8 12/17 - 12/23 29.7 +/- 5.4 22.7+/- 4.9 12/24 - 12/30 18.9 +/- 3.8 22.3 +/- 4.0 Qtr Avg +/- 2 sd 22.8 +/- 13.3 21.5 +/- 9.3 Ann Avg +/- 2 sd 20.1 +/- 14.2 18.9 +/- 11.0

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 3, Airborne Iodine 1-131 (le-3 pCi/m3)

Page 1 of 4 Collection Date Locations JANUARY 01/01 - 01/07 01/08 - 01/14 01/15 - 01/21 01/22 - 01/28 FEBRUARY 01/29 - 02/04 02/05 - 02/11 02/12 - 62/18 02/19 - 02/25 MARCH 02/26 - 03/04 03/05 - 03/11 03/12 - 03/18 03/19 - 03/25 JANUARY 01 3

27

-5 15 3 +16

-5 17 01

-7+/- 16 5 +/- 15

-5 +/- 27 20 +/- 27 01 6 +/- 20 5 +/- 21 8 +/- 23

-16 +/- 21 15-C 13+/-31 0 +/- 19 6 +/- 20

-10 +/- 14 15-C

-2+/- 18

-11 +/- 15 2 +/-21 10 +/-19 15-C

-9+/- 14

-11 +/- 17 2 +/-15 3 +/-14 02

-19 +/-25 3 +12 0 +/-14 10+/- 15 01/01 - 01/07 01/08 - 01/14 01/15 - 01/21 01/22 - 01/28 02

-1 +/- 12

-4 +/- 14 12 +/- 20 10 +/- 18 02 1 +/-14 13 +/- 15 2+/-16 9+/-17 27 17 +/-27

-5+/- 17

-2+/- 15

-9+/- 13 27

-2 +/- 19 2 +/- 16 16 +/- 23

-20 +/- 22 27

-3 +/- 17

-2 +/- 17 15 +/-23

-14 +/- 18 03 3 +/- 20

-2 +/- 16 7 +/-17 11 +/-15 03 0+/-11

-7+/- 12 21 +/-24 4+/-17 03

-2 12 10+/- 17 2 +/-18 2 +/-18 04

-20 +/- 30

-4 +/- 21

-6 +/- 21

-2 +/- 18 04

-4 +/- 24 5 +/- 17 5 +/- 22

-11 +/-22 04

-5+/- 12 19+/- 18

-6 +/- 20 8 +/-18 10 32 +/- 29

-3+/- 17 11 +/-15 15 +/-15 10

-7+/- 13 6 +/- 14 12 +/- 27

-13 +/- 24 10

-11 +/- 17 6 +/- 16 8 +/- 16

-16 +/- 17 11

-9 +/- 28 2 +/- 20 5 +/- 16

-12 +/- 18 11

-2+/- 19 11 19

-8 +/-32

-7 +/- 25 11 2 +/- 18 2 +/- 16 2 +/- 22 0+/-18 FEBRUARY 01/29 - 02/04 02/05 - 02/11 02/12 - 02/18 02/19 - 02/25 MARCH 02/26 - 03/04 03/05 - 03/11 03/12 - 03/18 03/19 - 03/25

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 3, Airborne Iodine 1-131 (le-3 pCi/m3)

Locations Page 2 of 4 Collection Date APRIL 03/26 - 04/01 04/02 - 04/08 04/09 - 04/15 04/16 - 04/22 04/23 - 04/29 MAY 04/30 - 05/06 05/07 - 05/13 05/14 - 05/20 05/21 - 05/27 JUNE 05/28 - 06/03 06/04 - 06/10 06/11 - 06/17 06/18 - 06/24 APRIL 03/26 - 04/01 04/02 - 04/08 04/09 - 04/15 04/1'6 - 04/22 04/23 - 04/29 MAY 04/30 - 05/06 05/07 - 05/13 05/14 - 05/20 05/21 - 05/27 JUNE 05/28 - 06/03 06/04 - 06/10 06/11 - 06/17 06/18 - 06/24 01

-2 +/- 17

-7 +/- 25

-7 +/- 22 20 + 23

-3 26 01

-2 +/- 23 4 +/- 23 7 +/- 16

-5 +/- 22 01 10 19 5 +/- 17 6 +/- 12

-6 +/- 22 15-C

-8 +/- 15

-10 +/- 20 4 +/-21

-7 +/-22

-7 +/- 24 15-C

-24 +/- 24 5 +/- 29

-3 +/- 15 21 +/- 18 15-C

-5 +/- 16

-5 +/- 18 13 +/- 22

-14 +/- 25 02 7 -13 24 -21

-4+/-21 14 +/- 20 18 +/-15 02 10 18

-2 +/- 18

-9 +/- 13 2 +/- 19 02

-2 +/- 15 11 -17

-6 13 16 +/-24 27 0 +/- 17

-2 +/- 18

-5 +/- 27

-3 +/- 25

-14 +/- 28 27 7 +/- 21 9 +/- 27 7 +/- 15

-13 +/- 19 27

-10 +/- 21

-12 +/- 16 12 +/- 14 17 +/- 30 03 13 +/- 14 25 +/- 27

-5 +/- 23

-7 +/- 25 8 +/-29 03

-9 +/- 18

-5 +/- 23

-7 +/- 15

-11 +/- 25 03

-13 +/- 20 13 +/- 17

-2 +/- 17 5 +/- 30 04 5 +/- 17

-9 +/- 23

-12 +/- 25 5+/--23 0 +/-27 04 12 +/-'23 2 +/- 19 4+/--17

-5 +/- 28 04

-2 +/- 19 0 +/- 16

-4 +/- 17

-3 +/- 28 10 0 +/- 14 4+/--21 2+/--23

-7 +/- 21

-14 +/- 18 10 2 +/- 19 0 +/- 26

-3 +/- 15 18 10 2 +/- 17

-3 +/- 15 6 +/- 17

-12 +/- 28 11

-6 +/- 15

-2 +/- 25

-36 +/- 26

-19 +/- 28 29 +/- 27 11

-20 +/- 23 22 +/- 30

-11 +/- 14

-5 +/- 25 11

-16 +/- 15 2 +/-19 2 +/-13

-3 +/- 28 A

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 3, Airborne Iodine 1-131 (le-3 pCi/m3)

Page 3 of 4 Collection Date Locations JULY 06/25 - 07/01 07/02 - 07/08 07/09 - 07/15 07/16 - 07/22 07/23 - 07/29 AUGUST 07/30 - 08/05 08/06 - 08/12 08/13 - 08/19 08/20 - 08/26 SEPTEMBER 08/27 - 09/02 09/03 - 09/09 09/10 - 09/16 09/17 - 09/23 09/24 - 09/30 JULY 06/25 - 07/01 07/02 - 07/08 07/09 - 07/15 07/16 - 07/22 07/23 - 07/29 AUGUST 07/30 - 08/05 08/06 - 08/12 08/13 - 08/19 08/20 - 08/26 SEPTEMBER 08/27 - 09/02 09/03 - 09/09 09/10 - 09/16 09/17 - 09/23 09/24 - 09/30 01 13 +/- 27 29 +/- 29

-10 +/- 20

-8 +/- 13 3+/-33 01

-10 +/- 24 8 27 9 +/-14

-2 10 01 5 +/- 14 0+/-16 9+/-19 15 17

-7 +/- 24 15-C 2 21 24 +/- 26

-20 +/- 20

-3 14

-11 +/-28 02

-11 +/- 16

-34 +/- 25 14 +/- 20

-3 +/- 12 9 +/- 20 02 14 22 8 -21 1 +/-12

-8 13 02

-9 +/- 15

-3 +/- 17 0 +/- 14

-7 +/- 34 8 +/- 28 27 7

20 22 + 26

-17 +/- 19

-6 +/- 13

-8 +/- 26 27 11 17

-12 +/- 24 2

15

-7+/- 16 27 4 +/- 22

-10 +/- 17

-11 +/-21

-11 +/-20 12 +/- 21 03 3 +/- 26

-9 +/- 27 0 +/- 20

-1 +/- 14

-6 +/- 32 03 13 +/- 25

-28 +/- 25

-11 +/- 17 2 +/- 18 03

-12 +/- 16 0+13 16

-17 17 5 +/- 19 04

-10 +/- 26 31 +/-33

-22 +/- 19

-1 + 17 15 26 04

-3 +/- 22

-8 +/- 24

-5 +/- 21 11 16 04 6 +/- 19

-10+/- 20 8 +/- 20 5 +/- 19 13 22 10 14 +/- 24

-20 +/- 28 11 +/- 23 3 +/- 13 0 +/- 28 10

-7 +/- 24

-5 +/- 25 3 +/- 15 9+/-19 10 12 +/- 15 10 +/- 16

-9 +/- 18

-6 +/- 18

-12 +/- 24 11

-19+/- 28 3

28 26 + 25 4

14

-16 35 11

-7 +/- 25

-7 + 24

-6+/- 17 3

15 11

-20 16 0 +/- 14 9 +/- 15

-17 + 22

-23 + 21 B

C 15-C

.5 +/- 22 7 +/- 23

-12 +/- 15

-14+/- 17 15-C

-18 +/- 19 16 +/- 19

-5 +/- 16

-8 +/- 20

-2+/-21 D

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 3, Airborne Iodine 1-131 (le-3 pCi/m3)

Page 4 of 4 Collection Date Locations OCTOBER 10/01 - 10/07 10/08 -10/14 10/15 - 10/21 10/22 - 10/28 NOVEMBER 10/29 - 11/04 11/19 - 11/25 DECEMBER-11/26 - 12/02 12/03 - 12/09 12/10 - 12/16 12/17 - 12/23 12/24 - 12/30 OCTOBER 10/01 - 10/07 10/08 - 10/14 10/15 - 10/21 10/22 - 10/28 NOVEMBER 10/29 - 11/04 11/05 - 11/11 11/12 - 11/18 11/19 - 11/25 DECEMBER-11/26 - 12/02 12/03 - 12/09 12/10 - 12/16 12/17 - 12/23 12/24 - 12/30 01

-5 +/-22 11 +/-14 8 +/-16 11 +/-22 01

-8 +/- 18

-4 +/- 24 2 +/- 21

-2 +/- 22 01 16 +/-34

-14 +/-21

-5 +/- 19 16 +/-25

-6 +/-18 15-C

-11 +30

-7 +/-14

-7 +/-16 19 +/-23 15-C

-10 +/- 23 20 +/- 30

-11 +/- 21

-12 +/- 26 15-C

-3 +/- 36 0 +/- 23 0 +/- 25

-13 +/- 26

-21 +/- 19 02 11 +/-19 2 +/-20 E

3 +/- 14 28 +/-28 02 4 +/-20 18 +/-25 0 +/-20 2 +/-22 03

-9 +/- 19

-4 +/- 12

-5 +/- 13 0 +/-28 03 0 +/-20 11 +/-20

-9 +/-23 5 +/-24 03

-8 +/- 35

-2 +/- 19 7 +/- 24 26 +/- 23 14 +/- 17 04 2 +/- 23 6 +/- 13 3 +/- 14 21 +/-25 04 2 +/- 26

-7 +/- 23 7 +/- 21

-5 +/- 24 04

-15 +/-27

-2 +/-23 12 +/-24 4 +/- 24 0 +/-17 10

-16 +/- 24

-2 +/- 16

-3 +/- 16 0 +/-25 10 14 +/- 25 7 +/- 24 7++/-18 2 +/- 28 10 3 +/- 32

-4 +/- 20

-12 +/-18 2 +/-18

-8 +/-15 11 0 +/- 21 6 +/- 14 0 +/- 14

-5 +/- 26 11 5 +/- 25 9 +/- 24 18 +/-22 0 +/-26 11 9+/-31 0 +/-27

-5 +/-18 29 +24

-3 +/-21 02 16 +/- 30 11 +/- 25

-21 +/- 24 8 +/- 21

-5 +/- 18 27

-15 +21

-2 +/- 17

-3 +/- 17

-10 +/-27 27

-9 +/-22

-2 +/-22 2+/-26

-13 +/- 29 27

-3 +/- 35 6 +/- 22

-5 +/- 25 11 +/- 34 10 +/- 20

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 4-A, Air Particulates Gamma Spectra - Quarter 1 (le-3 pCi/m3)

Page 1 of 1 Location Isotope 01 02 03 04 10 11 15-C 27 01 02 03 04 10 11 15-C 27 Ba-140

-14.0 28.0

-4.0 19.0

-6.0h

+25.0 0.0+/- 19.0 0.0 +/- 26.0

-23.0 +/- 26.0 8.0+ 17.0 2.0 +/- 31.0 Cs-134

-0.1 +/-0.7

-0.3+/-0.4

-0.1 +/-0.7 0.6 +/- 0.9

-0.1+/-0.6 0.3 +/- 1.0

-0.1 +/-0.6 0.1 +/-0.8 Be-7 90.0 +/- 32.0 107.0 24.0 79.0 33.0 80.0 31.0 65.0 +/-25.0 93.0 +/-31.0 83.0 +/-27.0 112.0 32.0 Cs-137

-0.4 +/- 0.7

-0.2 +/- 0.5 0.4 +/- 0.4 0.4 +/- 1.0 0.0 +/- 0.5 0.6 +/- 0.8

-0.1+/-0.6

-0.1+/-0.6 Ce-141

-2.3 +/- 2.5

-0.4 +/- 2.2 1.3 +/- 3.2

-2.4 +/- 2.6

-1.7 +/- 2.5

-0.9 +/- 2.5 0.2 +/- 2.5 0.1 +/- 2.9 Mn-54 0.6 +/- 0.7

-0.1+/- 0.4 0.6 +/- 0.8

-0.6+/- 1.0

-0.1 +/-0.7 0.2 +/- 0.7 0.0 +/- 0.8

-0.1+/- 0.7 Ce-144

-3.3 +/- 2.7

-0.8 +/- 2.2

-2.9 +/- 3.2

-1.9 +/- 3.2 0.0 +/- 2.5

-1.9 +/- 2.7

-1.3 +/- 2.5 2.5 +/- 3.0 Nb-95

-0.2 +/-2.4 0.2 +/-2.5 3.2 +/-2.6 1.9 2.7 0.7 +/-2.7

-0.6 +/- 3.0

-2.6 +/- 2.2 1.0 +/- 2.3 Co-58 0.1 +/- 1.0 0.3 +/- 0.8 0.5 +/- 1.5 0.9+/- 1.7 0.1 +/- 1.5 0.9+/- 1.7 0.0+/- 1.2 0.2 +/- 1.1 Ru-103

-1.5 +/- 1.8 0.2 +/- 1.6 0.0+/- 1.3

-1.8 +/- 2.5

-1.1 1.8 1.0 1.7 0.5 2.1

-0.7+/- 1.9 Co-60

-0.5 +/- 0.7

-0.1+/- 0.6 1.1 +/- 1.2 0.2 +/- 0.4 0.0 +/- 0.6

-0.2 +/- 0.5

-0.1+/-0.6 0.2 +/- 0.8 Ru-106

-3.1 +/- 6.7

-2.1 +/- 5.2

-1.2 +/- 6.4

-2.9 +/- 6.5

-1.0 +/- 5.9 2.1 +/-4.8 4.2 +/- 7.0 1.2 +/- 8.8 Cr-51 17.0 +/- 25.0

-13.0 +/- 22.0 11.0 +/- 27.0 0.0 +/- 27.0 9.0 +/- 22.0 9.0 +/- 25.0 0.0+/- 19.0 7.0 +/- 22.0.

Zr-95 0.2 2.1.

-2.1+/-2.2 0.4 +/-1.9

-0.6 2.3

-0.2 2.3

-0.1 3.0 1.8 2.6 1.5 2.4

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 4-B, Air Particulates Gamma Spectra - Quarter 2 (le-3 pCi/m3)

Page 1 of 1 Location Isotope 01 02 03 04 10 11 15-C 27 01 02 03 04 10 11 15-C 27 Ba-140 38.0 +/- 76.0 0.0 + 160.0 38.0 +/- 75.0

-38.0 + 76.0 40.0 +/- 120.0

-80.0 +/- 200.0 0.0 +/- 98.0

-60.0 +/- 130.0 Cs-134 0.1 +/- 1.4

-0.5 + 1.1

-0.6 +/- 1.3 1.2 +/- 1.9 0.8 + 1.8 0.2 +/- 2.1 1.0 +/- 1.2 0.0 + 0.9 Be-7 108.0 + 83.0 92.0 + 66.0 168.0 + 67.0 85.0. 65.0 91.0 68.0 84.0 + 71.0 127.0 +/- 68.0 141.0 +/- 60.0 Cs-137 0.8 + 1.4

-0.4 +/- 1.2 0.1 :L 1.7

-0.4 +/- 1.1 0.2 +/- 1.3 0.2 + 1.5 0.4 +/- 1.4 0.8 + 1.3 Ce-141

-4.2 + 9.5 0.1 +/- 7.6

-2.0 - 10.0

-8.0+ +/-11.0

-1.0+ 11.0 0.1 +/-9.9

-7.0+ 11.0

-5.0 -414.0 Mn-54 0.0+ +/-1.0 1.1 +/- 2.0

-1.0+ 1.1 0.4 + 1.2

-0.2+ +/-1.7 0.5 + 1.7 0.8 +/- 1.6

-0.6 +/- 1.3 Ce-144 2.6 +/- 8.4 0.7 + 7.1

-3.5 +/- 9.8 2.6 +/- 7.2

-1.6 +/- 7.9

-2.8+ +/-8.8

-6.4 +/- 9.1

-5.9+-48.1 Nb-95

-1.4 : 5.4 0.6.47.5 4.0 +/- 10.0 1.7 + 5.6

-2.04: 9.0 4.0 +/- 9.5

-1.1 + 6.4 6.0 +/- 10.0 Co-58 0.2 +/- 2.8 1.5 +/- 3.4 1.1++/- 4.2 0.4 +/- 3.9

-1.0 +/- 3.1

-2.6 +/- 3.4 2.0 +/- 2.3 0.9 +/- 2.6 Ru-103

-2.2 +/- 6.8 0.0 +/- 6.3 8.5 +/- 6.0 5.3 +/- 5.7

-2.0 +/- 6.3 0.0 +/- 5.5

-1.0 +/- 4.4

-7.3 + 7.7 Co-60 0.9+ +/-1.3 0.0. 0.0 0.4+ +/-1.7

-0.6 +/- 1.7 0.9 +/- 1.2

-0.1 + 2.1

-1.0 +/- 1.4

-0.6+L 1.7 Ru-106

-2.0 +/- 18.0 2.0 + 12.0 8.0+ +/-16.0 5.0 +/- 12.0 7.9 + 9.2

-10.0 +/- 23.0 2.2 +/- 9.6 2.0+ +/-13.0 Cr-51 40.0+ +/-110.0

-10.0 +/- 69.0 61.0 +/- 89.0 25.0 +/- 92.0

-23.0 +/- 72.0

-39.0 + 94.0 23.0 +/- 72.0 30.0+ +/-110.0 Zr-95

-2.1 + 6.2

-1.9 +/- 4.2

-0.9 +/- 5.6 0.2 +/- 3.6

-3.3 +/- 3.8 0.4+/-5.4

-0.8 +/- 5.2

-1.1 + 4.6

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 4-C, Air Particulates Gamma Spectra - Quarter 3 (le-3 pCi/m3)

Page 1 of 1 Location Isotope 0,1 02 03 04 10 11 15-C 27 01 02 03 04 10 11 15-C 27 Ba-140 0.0 43.0 10.0 +/- 34.0

-21.0 +/- 30.0 0.0 + 45.0

-10.0 +/- 45.0 0.0 +/- 42.0 0.0 +/- 42.0 0.0 + 49.0 Cs-134 0.5 +/- 1.7

-0.7 + 1.5 2.0 +/- 1.6

-0.8 +/- 1.7 0.4 +/- 0.5 0.7 +/- 1.3 0.4+/- 1.1

-1.3 +/- 1.7 Be-7 141.0 + 61.0 127.0 + 52.0 104.0 +/- 55.0 63.0 ++/-55.0 126.0 +/- 41.0 127.0 +/- 56.0 134.0 +/- 54.0 96.0 +/- 51.0 Cs-137

-0.1 + 1.5 1.0 + 1.0

-0.2 +/- 1.8

-2.1 +/- 2.0

-0.1 +/-0.6 0.4 +/- 1.6

-0.1 +/- 1.4 0.2 +/- 1.2 Ce-141

-2.5 +/- 6.6

-1.1 +/- 6.8

-0.6 +/- 7.2 0.7 +/- 7.2 0.4 +/- 2.1 4.4 +/- 6.0 6.3 +/- 6.4

-1.7 +/- 7.0 Mn-54 1.0 + 1.8 0.0+/- 1.7

-0.3 + 1.7 1.0+/-1.8 0.1 +0.8

-1.3 1.6

-1.0+ 1.9 0.9+/- 1.1 Ce-144 3.1 +/-7.7 1.4 +/- 8.5 1.5 +/- 7.7

-1.6 +/- 6.8

-1.1 +/-2.5 0.0 +/- 7.4

-9.8 +/- 8.4 0.7 +/- 8.5 Nb-95

-0.2 +/- 3.5

-7.6 +/- 5.9 3.7 +/- 4.6

-0.7 +/- 6.4 0.4 +/- 3.6

-1.0 +/- 3.8

-5.3 + 6.1

-1.8 +/- 4.0 Co-58

-1.3 +/- 2.7

-0.4+/- 1.6 1.8 +/- 2.8

-0.5 +/- 1.0 0.4 +/- 1.6

-0.3 +/- 2.3

-0.1 +/-3.4 1.2 +/- 2.4 Ru-103 2.1 +/-2.4 2.5 +/- 4.8

-1.4 2.7

-6.5 4.3

-1.5 1.8

-0.7 4.9 0.7 2.3

-2.6 3.6 Co-60

-0.5 +/- 1.0

-0.9+/- 1.3 1.3 +/- 1.5

-0.1 +/- 1.3 1.2 +/- 1.3

-0.1 +/- 1.3 1.2 +/- 1.9 0.3 +/- 1.4 Ru-106

-22.0+/- 18.0 16.0+/- 16.0

-0.4 +/- 7.7 21.0+ 15.0 4.5 +/- 8.7 6.0+16.0 4.0+/-15.0 2.0+/-11.0 Cr-51

-21.0 : 63.0

-75.0 +/- 61.0

-20.0 +/- 48.0 43.0 +/- 53.0 18.0 +/- 33.0

-7.0 54.0

-53.0 56.0

-13.0 56.0 Zr-95 2.4 +/- 5.6

-1.2 +/- 5.5

-0.6 +/- 4.2 1.5 +/-5.3

-0.8 +/- 3.0

-1.4 +/- 5.2 2.2 4.7

-0.8 1.7

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 4-D, Air Particulates Gamma Spectra - Quarter 4 (le-3 pCi/m3)

Page I of I Location Isotope 01 02 03 04 10 11 15-C 27 01 02 03 04 10 11' 15-C 27 Ba-140

-32.0 +/- 64.0 28.0 + 39.0

-13.0 +/- 58.0 0.0 +/- 0.0

-14.0 + 28.0 0.0 +/- 0.0

-39.0 +/- 45.0

-26.0 + 52.0 Cs-134 1.3 +/- 1.8 0.3 +/- 0.6 0.2 + 1.7

-0.4 +/- 2.3 0.0 + 0.8

-0.9 + 2.1 0.4 +/- 1.3 1.1 +/- 1.6 Be-7 178.0 +/- 83.0 124.0 +/- 46.0 108.0 + 48.0 156.0 + 75.0 73.0 +/- 54.0 97.0 +/- 87.0 93.0 +/- 48.0 122.0 +/- 71.0 Cs-137

-1.5 +/- 2.2

-0.6 +/- 1.4

-0.1 +/- 1.1

-0.7 +/- 2.2 0.3 + 1.4 0.8 +/- 1.9 0.6+/- 1.2 1.3 +/- 1.5 Ce-141 3.0 +/- 6.1

-0.3 +/- 7.1

-0.3 +/- 5.8 1.5 +/- 8.7 0.3 +/- 7.9 2.8 +/- 9.9 1.4 +/- 6.5 3.9 +/- 7.9 Mn-54

-0.7 +/- 1.5 0.6 +/- 1.4

-0.5 +/- 1.0 0.6 +/- 1.9

-0.3 +/- 1.3

-0.6 +/- 2.6 0.5 +/- 1.6 0.6 +/- 1.9 Ce-144

-1.6 +/- 7.4

-2.0 +/- 8.4

-4.3 +/- 7.4 5.0+/- 11.0 0.0 +/-7.2

-8.0 +/- 9.3 3.0 +/- 6.8 0.0 +/- 9.7 Nb-95

-0.3 +/- 6.4

-3.6 +/- 2.6

-2.9 +/- 5.5

-5.2 +/- 4.8

-1.4 +/- 5.3

-3.3 +/- 6.3 0.6 +/- 5.6

-1.6 +/- 5.1 Co-58 0.0 +/- 0.0 0.2 +/- 2.6 0.2 +/- 2.1 0.0 +/- 0.0

-0.2 +/- 2.8 0.1+/- 2.7

-1.0 +/- 2.6 0.1 +/-2.6 Ru-103

-1.3 +/- 2.6 2.0 +/- 3.9 2.4 +/- 3.9

-2.6 +/- 5.1 1.3 +/- 3.7

-2.6 +/- 6.4 2.4 +/- 3.8

-2.5 +/- 6.2 Co-60 0.0 +/- 0.0

-0.5 +/- 2.0 0.6+/- 1.4

-0.1 +/-2.2 1.7 +/- 1.9 0.7 +/- 1.5

-0.5 +/- 1.6

-0.1 +/-2.1 Ru-106 0.0 +/-0.0

-5.0 +/-17.0

-6.0+/- 13.0

-1.0+/- 19.0 1.0+/- 12.0

-2.0 +/-23.0 5.7 +/-9.3

-1.0+/- 19.0 Cr-51

-8.0 +/- 38.0

-7.0+/- 65.0

-13.0 +/- 62.0 13.0 +/- 59.0 0.0 +/- 58.0

-41.0 +/- 90.0 0.0 +/-44.0 52.0 +/-90.0 Zr-95

-0.3 +/- 6.0 2.1 +/-4.3 1.2 +/- 4.3

-1.4 +/- 5.8 3.1 +/- 5.3 1.9 +/- 3.7

-1.4 +/- 3.1 0.0+/-0.0

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 6, Soil (pCi/g)

Page 1 of 1 Location Collection Date Isotope 03 04 14-C Be-7 06/14/07

-0.29 +/- 0.41 Cs-134 06/14/07

-0.04 +/- 0.05 Ru-103 06/14/07 0.08 +/- 0.06 Be-7 06/14/07 0.02 +/- 0.30 Cs-134 06/14/07 0.02 + 0.02 Ru-103 06/14/07 0.00 + 0.04 Be-7 06/14/07 0.50 +/- 0.47 Cs-134 06/14/07 0.04 +/- 0.05 Ru-103 06/14/07 0.02 + 0.05 Ce-141

-0.03 +/- 0.09 Cs-137 0.65 +/- 0.12 Ru-106 0.07 + 0.39 Ce-141 0.07 +/- 0.07 Cs-137 0.57 +/- 0.06 Ru-106 0.00 +/- 0.23 Ce-141 0.00 +/- 0.09 Cs-137 1.21 + 0.13 Ru-106 0.22 +/- 0.38 Ce-144

-0.30 +/- 0.29 Fe-59

-0.02 +/- 0.10 Sb-125 0.03 +/- 0.11 Ce-144 0.06 +/- 0.17 Fe-59 0.00 +/- 0.07 Sb-125 0.02 +/- 0.07 Ce-144 0.13 +/- 0.29 Fe-59

-0.03 + 0.10 Sb-125

-0.12 +/- 0.11 Co-58

-0.02 +/- 0.04 K-40 10.20+ 1.50 Th-228 0.80 + 0.23 Co-58

-0.01 +/- 0.03 K-40 10.97 +/- 0.80 Th-228 1.08 + 0.10 Co-58 0.02 +/- 0.05 K-40 12.00 +/- 1.30 Th-228 1.17 +/- 0.21 Co-60

-0.01 +/- 0.05 Mn-54 0.07 +/- 0.05 Zn-65

-0.25 +/- 0.13 Co-60 0.00 +/- 0.02 Mn-54 0.00 +/- 0.03 Zn-65 0.00 +/- 0.12 Co-60 0.00 +/- 0.04 Mn-54

-0.02 +/- 0.05 Zn-65

-0.09 +/- 0.19 Cr-51 0.28 + 0.47 Nb-95

-0.01 + 0.06 Zr-95

-0.01 +/- 0.07 Cr-51

-0.12 +/- 0.44 Nb-95

-0.01 +/- 0.05 Zr-95 0.02 +/- 0.06 Cr-51

-0.08 +/- 0.51 Nb-95

-0.02 +/- 0.06 Zr-95

-0.01 +/- 0.08

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 8, Goat Milk (pCi/L)

Page 1 of 1 Location Collection Date Isotope 21 Ba-140 04/11/07 04/18/07 04/25/07 05/03/07 05/10/07 06/30/07 0.30 +/- 4.40 5.50 + 6.30

-0.50 + 5.60

-1.70 + 4.40 1.60 +/- 5.80 F

Cs-134 0.50 +/- 3.50 4.70 +/- 4.10 1.80 +/- 3.80 3.20 + 3.30 0.70 :L 3.80 Cs-137 2.30 + 3.10

-1.40 +/- 4.30 2.80 +/- 4.10 2.90 +/- 3.10 1.60 +/- 4.10 1-131

-0.08 +/- 0.24 0.02 +/- 0.35

-0.15 +/- 0.05 0.21 + 0.40

-0.10 +/- 0.03 K-40 1060.00 +/- 100.00 1370.00 +/- 150.00 1650.00 +/-= 150.00 875.00 +/- 96.00 760.00 + 110.00 La-140 0.40 +/- 5.10 6.30 + 7.20

-0.50 +/- 6.40

-1.90 + 5.00 1.90 + 6.70 Sr-89 Sr-90 05/10/07 2.90 + 5.50 24-C Ba-140 0.86 + 0.95 Cs-134

-0.20 +/- 5.50 0.00 + 3.60 3.30 + 3.50 04/11/07 04/25/07 05/08/07 06/30/07 1.30 + 6.00

-5.40 + 5.50

-0.30 + 4.20 G

Cs-137 3.50 +/- 4.70 4.00 +/- 3.40 7.70 + 4.40 1-131

-0.08 +/- 0.24

-0.20 + 0.06 0.06 + 0.37 K-40 1490.00 + 160.00 910.00 +110.00 1590.00 = 120.00 La-140 1.50 + 6.80

-6.30 + 6.30

-0.40 + 4.80 Sr-89 Sr-90 05/08/07 7.70 +/- 5.70 1.10 +/- 1.00

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 9, Pasture Grass (pCi/g)

Page 1 of 5 Location Collection Isotope Date 21 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 01/17/07 -0.017 +/- 0.032 H 0.070 +/- 0.170

-0.017 +/- 0.031

-0.020 +/- 0.100 0.004 +/- 0.021 02/13/07 0.000 +/- 0.047 H 0.030 +/- 0.220

-0.022 +/- 0.040

-0.020 +/- 0.120

-0.003 +/- 0.028 03/21/07 -0.011 +/- 0.046 H 0.120 +/- 0.200

-0.025 +/- 0.029 0.028 +/- 0.079 0.001 +/- 0.026 04/11/07 -0.007 +/- 0.042 H 0.440 +/- 0.280 0.015 +/- 0.045

-0.020 +/- 0.120 0.005 +/- 0.028 04/25/07 -0.033 +/- 0.049 H 0.000 +/- 0.140 0.018 +/- 0.026

-0.020 +/- 0.063

-0.012 +/- 0.022 05/10/07 -0.040 +/- 0.110 H

-0.030 +/- 0.310

-0.003 +/- 0.057

-0.030 +/- 0.160

-0.016 +/- 0.043 05/23/07 -0.018 +/- 0.044 0.410 +/- 0.350

-0.023 +/- 0.039

-0.060 +/- 0.110

-0.012 +/- 0.031 06/14/07 0.026 +/- 0.073 0.470 +/- 0.300

-0.062 +/- 0.039

-0.047 +/- 0.097 0.004 +/- 0.026 06/27/07 0.005 +/- 0.064 0.280 +/- 0.280 0.007 +/- 0.037 0.022 +/- 0.095 0.009 +/- 0.022 07/17/07 -0.014 +/- 0.044 0.510 +/- 0.290 0.011 +/- 0.024 0.065 +/- 0.078

-0.001 +/- 0.028 08/08/07 0.036 +/- 0.045 0.400 +/- 0.290

-0.004 +/- 0.026 0.005 +/- 0.093

-0.001 +/- 0.020 08/22/07 0.011 +/- 0.072 0.690 +/- 0.350

-0.004 +/- 0.036 0.010 +/- 0.110 0.013 +/- 0.025 09/05/07 -0.004 +/- 0.032 0.470 +/- 0.300 0.014 +/- 0.030

-0.040 +/- 0.100

-0.026 +/- 0.031 09/19/07 -0.009 +/- 0.025 0.990 +/- 0.200 0.012 +/- 0.017 0.028 +/- 0.059 0.002 +/- 0.014 10/17/07 0.062 +/- 0.074 0.840 +/- 0.360

-0.008 +/- 0.035 0.070 +/- 0.098 0.005 +/- 0.033 10/31/07

-0.025 +/- 0.049 1.800 + 0.450 0.001 +/- 0.039

-0.010 +/- 0.120 0.022 +/- 0.028 11/19/07 -0.070 :L 0.120 H 0.480 +/- 0.340 0.003 +/- 0.039 0.065 +/- 0.093 0.002 +/- 0.035 12/12/07 -0.063 +/- 0.098 H

-0.030 +/- 0.220

-0.005 +/- 0.039 0.042 +/- 0.097

-0.002 +/- 0.031 Cr-51 Cs-134 Cs-137 Fe-59 1-131 01/17/07 -0.070++/- 0.190 02/13/07 -0.170 +/- 0.270 03/21/07 -0.050 +/- 0.180 04/11/07 0.010 +/- 0.230 04/25/07 -0.030 - 0.160 05/10/07 -0.410 - 0.390 05/23/07 -0.160 - 0.290 06/14/07 -0.210 - 0.260 06/27/07 -0.010 + 0.290 07/17/07 -0.120 0.160 08/08/07 -0.140 - 0.220 08/22/07 0.060 +/- 0.270 09/05/07 -0.040 +/- 0.190 09/19/07 0.120 +/-- 0.120 10/17/07 0.020 0.210 10/31/07 0.030 - 0.290 11/19/07 -0.110 0.320 12/12/07 -0.100 - 0.260 La-140 01/17/07 -0.020 - 0.037 02/13/07 0.000 - 0.054 03/21/07 -0.013 - 0.053 04/11/07 -0.008 - 0.049 04/25/07 -0.038 + 0.056 05/10/07 -0.040 +/- 0.130 05/23/07 -0.021 - 0.050 06/14/07 0.030 - 0.083 06/27/07 0.005 +/-4 0.074 07/17/07 -0.016 L 0.051 08/08/07 0.041 +/- 0.051 08/22/07 0.012 + 0.083 09/05/07 -0.004 +/- 0.037 09/19/07 -0.010 +/- 0.028 10/17/07 0.062 +/- 0.074 0.007 +/-- 0.024

-0.003 +/- 0.024

-0.056 : 0.057

-0.003 z4 0.055 0.023 +/- 0.029 0.004 +/- 0.024 0.016 +/- 0.067

-0.014 +/- 0.080 0.012+/--0.027 0.013+/--0.024

-0.014:-0.060 0.031 +/--0.047 0.000 +/- 0.034 0.027 +/- 0.028 0.024 +/- 0.066

-0.015 +/- 0.051 0.012 +/- 0.020 0.013 +/- 0.017

-0.027 +/- 0.049 0.092 +/- 0.093 0.007 +/- 0.027

-0.002 +/- 0.038

-0.020 +/- 0.100 0.040 +/- 0.160 0.024 +/- 0.035 0.012 +/- 0.026 0.016 +/- 0.058

-0.005 +/- 0.002 0.006 +/- 0.024 0.013 +/- 0.025

-0.001 +/- 0.072

-0.002 +/- 0.001

-0.007 +/- 0.023 0.025 +/- 0.026

-0.015 +/- 0.061 0.014 +/- 0.014 0.008 +/- 0.024

-0.012 +/- 0.020 0.000 +/- 0.052 0.002 +/- 0.010 0.002 +/- 0.026 0.003 +/- 0.021 0.000 +/- 0.052

-0.004 +/- 0.001 0.011 +-0.029

-0.021 +-0.030 0.009 +/--0.065

-0.001 +/--0.011 0.011 +/- 0.031 0.009 +/- 0.026 0.000 +/- 0.062 0.004 +/- 0.016

-0.002 +/- 0.015 0.020 +/- 0.016

-0.028 +/- 0.030 0.000 +/- 0.008 0.006 + 0.030 0.033 +/- 0.031 "

0.042 +/- 0.081 0.010 +/- 0.026 0.008 +/- 0.028 0.003 +/- 0.029 0.008 +/- 0.071

-0.008 +/- 0.002 0.042 +/- 0.032

-0.005 +/- 0.028

-0.021 +/- 0.086 0.011 +/- 0.023 0.002 +/- 0.033 0.018 +/- 0.023 0.033 +/- 0.077

-0.090 + 0.120

-0.003 +/- 0.027

-0.014 +/- 0.033 0.010 +/- 0.028

-0.028 +/- 0.032 0.009 +/- 0.020

-0.004 +/- 0.041 0.019 +/- 0.025 0.003 +/- 0,023 0.006 +/- 0.024

-0.006 +/- 0.027

-0.003 +/- 0.027

-0.003 +/- 0.030 0.000 +/- 0.031

-0.001 +/- 0.018 0.031 +/- 0.032 0.000 +/- 0.026

-0.012 +/- 0.037

-0.005 +/- 0.034 K-40 11.300 1.000 9.700 1.100 14.990 +/- 0.980 18.700+/- 1.100 9.170 +/- 0.760 8.400- 1.500 5.060 - 0.950 5.970 - 0.850 5.580 -0.850 6.800 - 1.000 4.980 + 0.900 3.640 - 0.960 6.700 - 1.100 3.760 +/- 0.470 5.200+/- 1.100 5.180 +/- 0.890 22.900 4 1.200 9.900 +/- 1.200 Sb-125 0.003 +/- 0.051

-0.011 +/- 0.061

-0.048 +/- 0.058

-0.004 +/- 0.062

-0.023 +/- 0.036 0.020 +/- 0.100

-0.011 +/- 0.063 0.030 +/- 0.051 0.031 +/- 0.053

-0.019 +/- 0.048 0.010 +/- 0.056 0.012 +/- 0.072

-0.018 +/- 0.065 0.002 +/- 0.036

-0.016 +/- 0.058 Mn-54 Nb-95 Ru-103 Ru-106

-0.002 +/- 0.023

-0.006 - 0.025 0.006 +/- 0.024

-0.080 +/- 0.210

-0.004 +/- 0.027

-0.011 +/- 0.029 0.003 +/-4 0.030 0.050 4 0.240 0.015 +/- 0.025

-0.007 +/- 0.029

-0.001 +/- 0.023 0.090 +/- 0.210 0.001 +/- 0.028

-0.003 - 0.034

-0.030 +/- 0.030 0.040 +/- 0.270 0.003 +/- 0.017 0.009 -0.025 0.006 +/- 0.020 0.010 +/- 0.140 0.034 +/- 0.027

-0.004 +/- 0.051

-0.026 +/- 0.036

-0.020 +/- 0.330 0.005 +/-40.027

-0.021 +/-4 0.039

-0.037L

+/-0.033 0.150 +/- 0.210

-0.004 +/- 0.022 0.027 +/- 0.037 0.000 +/- 0.030

-0.090 +/- 0.190

-0.010 +/-40.022

-0.019 +/- 0.035

-0.022 +/- 0.025

-0.160 d 0.190

-0.025 +/-0.024 0.011 +/- 0.024

-0.014 +/- 0.021

-0.130 +/- 0.180

-0.007 -0.021 0.009 +/- 0.026 0.000 +/- 0.019 0.040 +/- 0.190

-0.010 +/-40.023 0.010 +/-0.038 0.006 +/- 0.024

-0.010 +/- 0.310 0.004 - 0.030

-0.008 - 0.035 0.014 +/- 0.027

-0.020 +/- 0.220

-0.005 +/-0.015 0.015 0.017 0.004+/-0.013

-0.110 +/-40.130 0.016 - 0.034

-0.002 - 0.034

-0.005 +/- 0.031 0.050 +/- 0.210

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 9, Pasture Grass (pCi/g)

Page 2 of 5 Location Collection Date Isotope 21 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 10/31/07 11/19/07 12/12/07 01/17/07 02/13/07 03/21/07 04/11/07 04/25/07 05/10/07 05/23/07 06/14/07 06/27/07 07/17/07 08/08/07 08/22/07 09/05/07 09/19/07 10/17/07 10/31/07 11/19/07 12/12/07

-0.025 +/- 0.049

-0.070 + 0.120

-0.063 +/- 0.098 Th-228

-0.065 +/- 0.080

-0.040 + 0.100 0.069 + 0.091 0.070 +/- 0.140 0.009 +/- 0.062 0.030 + 0.160 0.030 +/- 0.100

-0.002 +/- 0.098 0.010 + 0.088 0.020 +/- 0.100

-0.030 + 0.110

-0.010 +/- 0.140 0.038 + 0.099 0.018 +/- 0.066

-0.010 +/- 0.110

-0.060 +/- 0.110 0.110 + 0.150 0.050 +/- 0.100 Ba-140 22

-0.014 -0.026 0.001 - 0.028

-0.001 - 0.026 Zn-65

-0.039 +/- 0.055 0.015 +/- 0.072

-0.002 +/- 0.065 0.018 +/- 0.074

-0.022 +/- 0.046

-0.050 +/- 0.110

-0.024 +/- 0.070 0.004 +/- 0.064 0.024 +/- 0.057

-0.028 +/- 0.064 0.017 - 0.065

-0.060 +/- 0.075

-0.057 +/- 0.064

-0.032 +/- 0.031 0.020 +/- 0.160

-0.052 +/- 0.080

-0.111 +/- 0.081 0.022 +/- 0.072 Be-7 0.030 +/- 0.240 3.740 +/- 0.430 0.280 +/- 0.340 1.790 +/- 0.400 0.290 +/- 0.250 2.370 +/- 0.400 0.570 + 0.390 0.520 +/- 0.450 0.460 - 0.440 1.700 +/- 0.480 0.200 +/- 0.160 1.220 +/- 0.370 0.800 +/- 0.260 0.920 +/- 0.340 1,490 +/- 0.380 3.610 +/- 0.570 0.060 +/- 0.270 0.500 +/- 0.320 Cs-134

-0.016 +/- 0.028 0.002 +/- 0.031 0.036 +/- 0.035 0.000 +/- 0.030

-0.027 +/- 0.041 0.012 +/- 0.032 0.021 +/- 0.031 0.011 +/- 0.032

-0.024 - 0.066

-0.048 +/- 0.042\\

Zr-95

-0.039 +/- 0.041

-0.006 +/- 0.048

-0.030 +/- 0.047

-0.004 +/- 0.048 0.024 +/- 0.038 0.004 +/- 0.076 0.0 10 +/- 0.054

-0.050 +/- 0.046

-0.004 +/- 0.050 0.009 +/- 0.041 0.016 - 0.045

-0.022 - 0.047

-0.005 +/- 0.049

-0.017 - 0.023

-0.009 +/- 0.055

-0.030 - 0.049 0.003 - 0.058

-0.047 - 0.049 Ce-141 0.008 +/- 0.029

-0.033 +/- 0.059

-0.006 - 0.045 0.056 - 0.039

-0.037 - 0.073 0.004 +/- 0.046

-0.047 +/- 0.041

-0.026 - 0.054 0.055 +/- 0.096

-0.018 - 0.043 0.008 - 0.019 0.010 - 0.032

-0.019 - 0.025

-0.003 +/- 0.032

-0.019 - 0.031 0.018 +/- 0.046 0.003 +/- 0.045 0.023 +/- 0.053 Cs-137 0.074 +/- 0.037 0.033 +/- 0.033 0.032 +/- 0.031 0.036 +/- 0.031

-0.031 +/- 0.038 0.014 +/- 0.026 0.013 +/- 0.031

-0.004 +/- 0.032 0.004 +/- 0.032

-0.006 +/- 0.035

-0.130 +/- 0.270 0.100 +/- 0.230

-0.080 +/- 0.200

-0.036 +/- 0.067

-0.029 +/- 0.066 0.043 +/- 0.058 Ce-144 Co-58 Co-60 01/17/07 -0.022 - 0.052 H 02/13/07 0.073 +/- 0.088 H 03/21/07 0.029 +/-0.061 H 04/11/07 -0.027 +/- 0.046 H 04/25/07 -0.060 - 0.140 H 05/09/07 -0.028 - 0.066 H 05/23/07 0.017 +/- 0.060 06/14/07 0.016 +/- 0.093 06/27/07 -0.060 +/- 0.100 07/17/07 -0.008 +/- 0.071 08/08/07 -0.018 +/- 0.031 08/22/07 0.035 +/- 0.046 09/05/07 -0.008 +/- 0.036 09/19/07 0.005 +/- 0.038 10/17/07

-0.007 +/- 0.061 10/31/07 0.086 +/- 0.095 11/19/07 0.140+/--0.130 H 12/12/07 0.020 +/- 0.120 H Cr-51 01/17/07 -0.070 +/- 0.250 02/13/07 -0.030 +/- 0.340 03/21/07 70.290 +/- 0.290 04/11/07 0.140 +/- 0.270 04/25/07 0.560 +/- 0.470 05/09/07 0.330 +/- 0.300 05/23/07 0.180 +/- 0.320

-0.010 +/- 0.130 0.020 +/- 0.130 0.110+/--0.140 0.000 +/- 0.140

-0.110 +/- 0.170

-0.060 +/- 0.120

-0.070 +/- 0.120 0.010 +/- 0.140 0.010 +/- 0.140

-0.070 +/- 0.130

-0.063 +/- 0.069

-0.080 +/- 0.110

-0.047 +/- 0.071

-0.020 +/- 0.100

-0.008 +/- 0.083 0.050 +/- 0.150 0.060 +/- 0.130 0.030 +/- 0.150 Fe-59

-0.029 +/- 0.064 0.040 +/- 0.074 0.013 +/- 0.079

-0.003 +/- 0.067 0.000 +/- 0.100 0.029 +/- 0.066 0.008 +/- 0.068

-0.004 +/- 0.027 0.020 +/- 0.031 0.013 +/- 0.032

-0.003 +/- 0.029

-0.027 +/- 0.045

-0.042 +/- 0.029

-0.022 +/- 0.028 0.036 +/- 0.037

-0.008 +/- 0.038

-0.010 +/- 0.033 0.004 +/- 0.015

-0.002 +/- 0.029

-0.004 +/- 0.022 0.015 +/- 0.026

-0.025 +/- 0.030

-0.010 +/- 0.037 0.002 +/- 0.036 0.003 +/- 0.038 1-1,31

-0.025 +/- 0.080 0.050 +/- 0.160 0.036 +/- 0.082

-0.058 +/- 0.058 0.060 +/- 0.250 0.070 +/- 0.130 0.001 +/- 0.013

-0.008 +/- 0.028 0.000 +/- 0.030

-0.015 +/- 0.031 0.000 +/- 0.032

-0.006 +/- 0.043 0.003 +/- 0.028

-0.023 +/- 0.031 0.031 +/- 0.032

-0.009 +/- 0.041 0.010 +/- 0.026

-0.008 +/- 0.022

-0.031 +/- 0.036

-0.009 +/- 0.027 0.003 +/- 0.020 0.009 +/- 0.035 0.022 +/- 0.032 0.035 +/- 0.037 0.000 +/- 0.032 K-40 7.180 +/- 0.690 3.670 +/- 0.600 15.800+/- 1.100 7.860 +/- 0.880 9.090 +/- 0.970 5.060 +/- 0.630 4.880 +/- 0.950

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 9, Pasture Grass (pCi/g)

Page 3 of 5 Location Collection Date Isotope 22 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 06/14/07 06/27/07 07/17/07 08/08/07 08/22/07 09/05/07 09/19/07 10/17/07 10/31/07 11/19/07 12/12/07 01/17/07 02/13/07 03/21/07 04/11/07 04/25/07 05/09/07 05/23/07 06/14/07 06/27/07 07/17/07 08/08/07 08/22/07 09/05/07 09/19/07 10/17/07 10/31/07 11/19/07 12/12/07 01/17/07 02/13/07 03/21/07 04/11/07 04/25/07 05/09/07 05/23/07 06/14/07 06/27/07 07/17/07 08/08/07 08/22/07 09/05/07 09/19/07 10/17/07 10/31/07 11/19/07 12/12/07 0.390 + 0.430

-0.260 +/- 0.370

-0.180 +/- 0.270

-0.140 +/- 0.140

-0.010 +/- 0.200

-0.080 + 0.150 0.070 + 0.180 0.050 +/- 0.210 0.190 +/- 0.340

-0.020 +/- 0.370 0.050 +/- 0.420 La-140

-0.025 +/- 0.059 0.080 +/- 0.100 0.033 +/- 0.071

-0.031 +/- 0.053

-0.070 +/- 0.160

-0.032 +/- 0.075 0.020 +/- 0.069 0.020 +/- 0.110

-0.070 +/- 0.120

-0.009 +/- 0.082

-0.021 +/- 0.036 0.041 +/- 0.053

-0.009 +/- 0.041 0.005 + 0.04,4

-0.007 +/- 0.061 0.086 +/- 0.095 0.140 +/- 0.130 0.020 +/- 0.120 Th-228 0.090 +/- 0.130 0.030 +/- 0.140 0.200 +/- 0.160

-0.030 +/- 0.110 0.000 +/- 0.180 0.030 +/- 0.130 0.030 +/- 0.100 0.010+/- 0.110 0.000 +/- 0.130 0.040 +/- 0.120 0.059 +/- 0.080 0.100 +/- 0.120 0.080 +/- 0.100

-0.050 +/- 0.110 0.180 +/- 0.120 0.220 +/- 0.130

-0.010 +/- 0.170 0.090 +/- 0.160 0.024 +/- 0.032 0.025 - 0.035 0.010+/- 0.03 1

-0.009 + 0.0 19

-0.016 + 0.030 0.017 +/- 0.026 0.009 +/- 0.023 0.031 + 0.034 0.015 + 0.033 0.024 +/- 0.032

-0.013 +/- 0.033 Mn-54

-0.011 +/- 0.026 0.010 : 0.029 0.006 +/- 0.031

-0.004 +/- 0.029

-0.007 - 0.038

-0.026 - 0.027 0.003 + 0.030 0.022 +/- 0.048

-0.027 + 0.030

-0.025 +/- 0.031

-0.012 + 0.018 0.005 +/- 0.025 0.007 +/- 0.022 0.000 +/- 0.026

-0.027 + 0.031 0.036 + 0.032

-0.001 +/- 0.033

-0.011 +/- 0.029 Zn-65

-0.086 +/- 0.065 0.030 +/- 0.140

-0.090 +/- 0.120

-0.008 +/- 0.071

-0.020 :4 0.160 0.012 +/- 0.062 0.007 +/- 0.085

-0.068 +/- 0.087

-0.044 +/- 0.074

-0.104 +/- 0.077 0.018 - 0.045

-0.005 +/- 0.068 0.050 +/- 0.060

-0.013 +/- 0.053 0.014 +/- 0.068

-0.023 +/- 0.084

-0.041 +/- 0.083

-0.025 +/- 0.075 0.010 +/- 0.036 0.027 +/- 0.030 0.002 +/- 0.031 0.013 +/- 0.019

-0.002 +/- 0.027 0.007 +/- 0.023

-0.003 +/- 0.025 0.013 +/- 0.026

-0.039 +/- 0.034 0.020 +/- 0.033 0.006 +/- 0.033 Nb-95 0.015 +/- 0.032 0.029 +/- 0.065

-0.011 +/- 0.043 0.001 +/- 0.033

-0.033 +/- 0.065 0.006 +/- 0.045

-0.010 +/- 0.038

-0.048 +/- 0.050 0.022 +/- 0.048

-0.028 +/- 0.039

-0.009 - 0.018 0.003 +/- 0.036 0.006 +/- 0.024 0.007 +/- 0.026 0.017 +/- 0.033

-0.017 +/- 0.037

-0.010 +/- 0.044

-0.019 +/- 0.046 0.050 +/- 0.140 0.058 +/- 0.095

-0.026 +/- 0.075 0.009 +/- 0.051 0.000 +/- 0.067 0.000 +/- 0.053 0.052 +/- 0.064

-0.030 +/- 0.069

-0.065 +/- 0.079

-0.014 +/- 0.080

-0.114 +/- 0.088 Ru-103

-0.006 +/- 0.031

-0.004 +/- 0.039

-0.006 +/- 0.035

-0.012 +/- 0.026

-0.008 +/- 0.055 0.005 +/- 0.034 0.002 +/- 0.027 0.006 +/- 0.040 0.011 +/- 0.040 0.010 +/- 0.033

-0.003 +/- 0.014

-0.017+/- 0.028

-0.009 +/- 0.022

-0.016 +/- 0.026 0.008 +/- 0.026 0.001 +/- 0.033 0.000 +/- 0.038 0.016 +/- 0.038

-0.003 +/- 0.001 0.004 +/- 0.011

-0.005 +/- 0.002 0.002 +/- 0.014

-0.008 L 0.010 0.001 +/- 0.015 0.006 +/- 0.016

-0.003 +/- 0.018 0.008 +/- 0.018 0.012 +/- 0.026 0.050 +/- 0.230 Ru-106

-0.270 +/- 0.250 0.280 +/- 0.270 0.170 +/- 0.300

-0.230 +/- 0.280

-0.270 +/- 0.370

-0.100 +/- 0.260

-0.290 +/- 0.300 0.070 +/- 0.410 0.020 +/- 0.280

-0.260 +/- 0.290

-0.010 : 0.170

-0.050 +/- 0.220

-0.020 +/- 0.190 0.070 +/- 0.210 0.000 +/- 0.210 0.090 +/- 0.300 0.160 +/- 0.300

-0.080 + 0.290 4.500 +/- 1.100 4.820 +/- 0.890 4.290 +/- 0.820 5.490 +/- 0.790 4.520 +/- 0.870 7.030 +/- 0.860 3.830 +/- 0.780 5.700 +/- 0.900 5.940 +/- 0.970 9.350 +/- 0.940 12.090 +/- 0.990 Sb-125

-0.001 +/- 0.062 0.032 +/- 0.070 0.010 +/- 0.081 0.066 +/- 0.072

-0.016 +/- 0.091 0.020 +/- 0.067

-0.030 +/- 0.075 0.076 +/- 0.089 0.044 +/- 0.072 0.018 +/- 0.067

-0.004 +/- 0.041

-0.007 +/- 0.063

-0.018 +/- 0.053 0.016 +/- 0.058

-0.013 +/- 0.057 0.058 +/- 0.084

-0.008 +/- 0.074 0.035 +/- 0.081 Zr-95

-0.038 +/- 0.050

-0.050 +/- 0.057 0.018 +/- 0.057

-0.002 +/- 0.054 0.022 +/- 0.076 0.003 +/- 0.052 0.037 +/- 0.063 0.018 +/- 0.079 0.000 +/- 0.061 0.004 +/- 0.057

-0.008 +/- 0.031

-0.001 +/- 0.052 0.010 +/- 0.047 0.021 +/- 0.045 0.011 +/- 0.053

-0.009 +/- 0.059, 0.061 +/- 0.065

-0.035 +/- 0.065

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 9, Pasture Grass (pCi/g)

Page 4 of 5 Location Collection Date Isotope 24-C Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 01/17/07 -0.047 -0.063 H 0.940 +/-- 0.430 0.035 4- 0.047 0.090 +/- 0.150

-0.009 +/- 0.034 02/13/07 -0.058 -0.071 H 0.180 +/- 0.260 0.015 +/-- 0.040

-0.020 +/- 0.120 0.004 +/-L 0.029 03/21/07 0.027 + 0.060 H 0.230 +/- 0.280 0.017 +/- 0.045

-0.010 +/- 0.150 0.002 L 0.033 05/23/07 -0.009 +/- 0.039 0.260 +/- 0.240

-0.003 +/- 0.027 0.042 +/- 0.087 0.002 z- 0.019 06/14/07 -0.004 -0.065 0.430 +/- 0.320

-0.009 +/- 0.041

-0.090 +/- 0.110 0.025 +/- 0.031 06/27/07 0.038 +/- 0.061 0.440 +/- 0.260

-0.011 :L 0.037

-0.020 +/- 0.100 0.011 :L 0.025 07/17/07 0.003 +/- 0.035 0.730 +/- 0.340 0.001 + 0.028

-0.017 +/- 0.089

-0.014 +/- 0.028 08/08/07 -0.013 +/- 0.042 0.680 +/- 0.360

-0.027 -0.029

-0.050 +/- 0.100

-0.024 +/- 0.029 08/22/07 0.039 +/- 0.041 0.480 +/- 0.260 0.003 -0.024 0.012 +/- 0.065

-0.001 4 0.022 09/05/07 -0.031 +/- 0.029 0.570 +/- 0.230

-0.013 - 0.026 0.008 +/- 0.092 0.005 +/- 0.018 09/19/07 -0.031 :L 0.053 0.370 +/- 0.230 0.002 0.036 0.010 +/- 0.130

-0.017 +/- 0.027 10/17/07 0.000 +/- 0.063 0.540 +/- 0.310 0.003 - 0.033 0.050 +/- 0.100 0.008 +/- 0.034 10/31/07 0.034 +/- 0.076 2.650 +/- 0.530 0.020 +/- 0.041 0.010 d- 0.110

-0.003 :L 0.021 11/19/07 0.023 +/- 0.094 6.600 4- 0.520 0.010 +/- 0.045

-0.120 +/- 0.120 0.006 +/- 0.030 12/12/07 0.030 :L 0.100 H 0.500 +/- 0.330 0.019 +/- 0.045 0.060 +/- 0.120 0.004 +/- 0.030 Cr-51 Cs-134 Cs-137 Fe-59 1-131 01/17/07 -0.390 +/-- 0.320 0.024 +/-- 0.035 0.040 +/- 0.036 0.012 +/- 0.083 0.002 +/- 0.097 02/13/07 -0.200 +/- 0.300

-0.017 +/- 0.030 0.047 +/-- 0.041

-0.011 +/-- 0.077 0.027 +/- 0.099 03/21/07 -0.120 +/- 0.320 0.004 +/- 0.034 0.046 0.035

-0.021 +/- 0.080 0.014 +/- 0.094 05/23/07 -0.110 +/- 0.180 0.020 +/- 0.022

-0.007 - 0.023

-0.034 +/- 0.058

-0.006 +/- 0.002 06/14/07 -0.020 +/- 0.290 0.024 +/- 0.028 0.019 - 0.022

-0.026 +/- 0.073

-0.002 +/- 0.001 06/27/07 0.060 +/- 0.240 0.003 +/- 0.024

-0.025 +/- 0.023

-0.037 +/- 0.066 0.008 +/- 0.020 07/17/07 0.100 +/- 0.180 0.010 +/- 0.028

-0.007 : 0.023 0.011 +/- 0.066 0.003 +/- 0.015 08/08/07 -0.200 +/- 0.220 0.009 +/- 0.032

-0.027 +/- 0.024

-0.0131+/- 0.066 0.023 +/- 0.024 08/22/07 0.030+/--0.140

-0.007+/--0.025

-0.011+/--0.018

-0.013+/--0.054 0.001+/--0.016 09/05/07 0.010 +/- 0.170 0.003 +/- 0.024 0.010 +/- 0.018 0.023 +/-- 0.043 0.020 : 0.030 09/19/07 -0.090 - 0.280 0.007 +/- 0.031 0.012 +/- 0.026

-0.075 +/- 0.060

-0.004 +/- 0.001 10/17/07 0.090 +/- 0.230

-0.016 +/- 0.027 0.004 +/- 0.026 0.032 +/- 0.061

-0.015 +/- 0.014 10/31/07 -0.060 - 0.280 0.000 - 0.028

-0.014 +/- 0.021

-0.046 +/- 0.081

-0.001 +/- 0.013 11/19/07 -0.290 +/- 0.330 0.014 - 0.030

-0.002 + 0.025

-0.018 +/- 0.069

-0.003 +/- 0.013 12/12/07 0.200 0.350 0.001 +/-0.029 0.037 0.035 0.009 +/- 0.077 0.070 +/- 0.160 0.035 +/- 0.034 0.016 +/- 0.036

-0.008 +/- 0.036 0.006 +/-- 0.021

-0.011 +/- 0.025 0.000 +/- 0.022 0.021 +/- 0.032 0.004 +/- 0.032

-0.037 +/- 0.028

-0.003+/-- 0.019 0.000 +/- 0.033

-0.018 +/- 0.030

-0.002 +/- 0.028 0.008 +/- 0.026

-0.013 +/- 0.029 K-40 12.100 +/- 1.000 13.700 +/- 1.000 15.000 +/- 1.100 4.680 +/- 0.890 6.700 +/- 1.000 6.550 +/- 0.780 6.100 +/- 0.960 7.000 +/- 1.100 5.140 +/- 0.930 6.430 +/- 0.760 5.700 +/- 1.100 7.000 +/- 1.100 4.170 +/- 0.910 7.130 +/- 0.670 9.320 +/- 0.800 Sb-125

-0.025 +/- 0.078 0.020 +/- 0.072

-0.019'+/- 0.082 0.000 +/- 0.049

-0.089 +/- 0.065 0.004 +/- 0.052

-0.021 +/- 0.054 0.026 +/- 0.068 0.029 +/- 0.054 0.049 +/- 0.047

-0.031 +/- 0.062 0.033 +/- 0.057 0.044 +/- 0.072

-0.011 +/- 0.063 0.035 +/- 0.068 La-140 Mn-54 Nb-95 Ru-103 Ru-106 01/17/07 -0.054 +/- 0.073 0.002 +/- 0.033

-0.035 +/- 0.048

-0.014 +/- 0.037

-0.440 +/- 0.310 02/13/07 -0.066 +/- 0.082 0.001 +/- 0.036 0.004 +/- 0.038 0.000 +/- 0.032

-0.120 +/- 0.280 03/21/07 0.030 +/- 0.069

-0.015 +/- 0.036 0.050 +/- 0.038 0.023 +/- 0.032

-0.070 +/- 0.290 05/23/07 -0.010 +/- 0.045

-0.018 +/- 0.018 0.006 +/- 0.024

-0.017 +/- 0.022 0.040 +/- 0.150 06/14/07 -0.004 +/- 0.074 0.019 +/- 0.025

-0.019 +/- 0.035

-0.012 +/- 0.025

-0.040 +/- 0.200 06/27/07 0.043 +/- 0.071

-0.011 +/- 0.022

-0.018 +/- 0.029 0.006 +/- 0.024 0.050 +/- 0.220 07/17/07 0.003 +/- 0.040 0.028 +/- 0.021

-0.016 +/- 0.033 0.000 +/- 0.019

-0.020 +/- 0.200 08/08/07 -0.015 +/- 0.049

-0.001 +/- 0.023

-0.003 +/- 0.027

-0.008 +/- 0.025 0.110 +/- 0.240 08/22/07 0.044 +/- 0.047

-0.007 +/- 0.023 0.004 +/- 0.026

-0.002 +/- 0.022

-0.040 +/- 0.160 09/05/07 -0.036 +/- 0.033

-0.015 +/- 0.021 0.002 +/- 0.022 0.002 +/- 0.016 0.010 +/- 0.170 09/19/07 -0.035 +/- 0.061

-0.013 +/- 0.028 0.012 +/- 0.039

-0.018 +/- 0.032

-0.130 +/- 0.250 10/17/07 0.000 +/- 0.063 0.007 +/- 0.029

-0.006 +/- 0.032

-0.028 +/- 0.024 0.030 4 0.220 10/31/07 0.034 +/- 0.076 0.013 +/- 0.030 0.008 +/- 0.032

-0.006 +/- 0.033 0.070 +/- 0.310 11/19/07 0.023 +/- 0.094 0.005 +/- 0.026

-0.032 +/- 0.045

-0.016 +/- 0.035

-0.040 +/- 0.240 12/12/07 0.030 +/- 0.100

-0.017 +/- 0.026

-0.015 +/- 0.043 0.008 +/- 0.033 0.060 +/- 0.250

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 9, Pasture Grass (pCi/g)

Page 5 of 5 Location Collection Date Isotope Date 24-C Th-228 Zn-65 Zr-95 01/17/07 02/13/07 03/21/07 05/23/07 06/14/07 06/27/07 07/17/07 08/08/07 08/22/07 09/05/07 09/19/07 10/17/07 10/31/07 11/19/07 12/12/07 0.170 + 0.170 0.110+0.160 0.120+0.110 0.080 +/- 0. 100 0.029 +/- 0.089 0.057 +/- 0.077 0.090 -E 0. 110 0.020 + 0.120 0.033 + 0.095 0.105 +/- 0.084

-0.024 + 0.093 0.080 +/- 0. 100

-0.020 + 0.100

-0.010 +/- 0.130 0.080 +/- 0. 120 0.050 +/- 0. 150

-0.070 +/- 0.100 0.020 +/- 0. 120 0.037 +/- 0.061

-0.033 +/- 0.074

-0.057 +/- 0.058 0.010 +/- 0.067

-0.052 + 0.069

-0.054 +/- 0.053

-0.066 + 0.055 0.026 + 0.061

-0.066 + 0.087

-0.031 +/- 0.061 0.140 +/- 0.110

-0.047 +/- 0.093

-0.021 +/- 0.063 0.031 + 0.056 0.006 +/- 0.060

-0.028 + 0.039

-0.039 + 0.045 0.000 + 0.043

-0.009 +/- 0.044 0.034 +/- 0.047 0.018 +/- 0.046 0.008 +/- 0.030

-0.028 +/- 0.050 0.007 + 0.041 0.024 + 0.041

-0.043 + 0.056 0.019 +/- 0.052

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 10, Well Water (pCi/L)

Page 1 of 6 Location Collection Isotope Date 71 03/20/07 06/29/07 09/24/07 12/19/07 03/20/07 06/29/07 09/24/07 12/19/07

,03/20/07 06/29/07 09/24/07 12/19/07 03/20/07 06/29/07 09/24/07 12/19/07 Ba-140

-1.2+/-6.4 2.4+/-6.8

-2.6+/-5.6 0.6 +/- 6.0 Cs-137

-0.1 +/-2.4 1.1+/- 2.1 0.8 +/- 3.0

-0.2 +/- 3.2 Be-7 18.0 +/-22.0

-1.0 +/-21.0

-10.0 +/-24.0

-10.0 +/-22.0 Fe-59

-2.3 +/- 5.9

-3.1+/-6.5 0.0 +/- 5.8 0.5 +/- 5.3 Nb-95

-0.5 +/- 3.6 2.9 +/- 3.4

-3.1 +/-4.0

-0.9+/-3.0 Mn-54

-0.7 +/- 2.7

-1.7 +/- 2.4

-0.9+/-3.3 0.5 +/- 2.5 Zn-65 72 3.7 +/- 5.7

-0.3 +/- 5.6

-6.9 +/- 7.2 6.0+/- 11.0 Ba-140 6.7 +/- 6.3 0.7 +/- 5.8

-1.8 +/- 5.9 Cs-137

-1.0 +/- 3.3 0.5 +/- 2.2 3.9 +/- 3.7 Zr-95 2.5 +/--5.1 4.3 +/- 4.8 0.3 +/- 5.8 6.1 +/-4.8 Co-58

-1.0 +/- 2.6

-0.9 +/- 2.8

-2.8 +/- 3.2

-2.3 +/- 2.9 H-3

-450.0 +/- 880.0 340.0 +/- 820.0 350.0 +/- 900.0 50.0 +/- 890.0 Ru-103

-0.4 +/- 2.8

-0.6 +/- 2.9 0.1 +/- 3.1

-2.4 +/- 2.8 Co-58

-0.7 +/- 3.7

-0.3 +/- 2.1

-0.2 +/- 3.7 H-3

-110.0 +/- 870.0 720.0 +/- 840.0 250.0 +/- 880.0 Ru-103 0.9 +/- 4.3

-2.8 +/- 2.3

-2.9 +/- 3.5 Co-60 0.0 +/- 3.5

-2.6 +/- 3.0

-1.2 +/- 3.5 1.6 +/- 2.6 1-131

-0.2 +/- 6.9

-0.1+/- 7.8 1.6 +/- 5.8 5.2 +/- 6.5u Ru-106 2.0 +/-22.0 13.0 +/-22.0 3.0 +/-25.0 8.0 +/-25.0 Cr-51

-13.0 +/- 23.0 5.0+/- 22.0 11.0 +/-25.0

-7.0 +/-27.0 K-40 14.0 +/-48.0 4.0 +/-48.0 34.0 +/-54.0 11.0 +/-40.0 Sb-125 1.5 +/- 6.2

-2.0 +/- 5.5 4.2 +/- 7.0 1.7 +/- 7.2 Cs-134

-1.4 +/- 2.9

-0.1 +/- 3.0

-0.6 +/- 3.6

-0.6 +/- 2.7 La-140

-1.4 +/- 7.4 2.8 +/- 7.8

-3.0 +/- 6.4 0.6 +/- 6.0 Th-228

-4.0+/- 11.0

-5.0 +/- 12.0 16.0+/- 16.0 6.0+/- 10.0 Be-7 Co-60 Cr-51 Cs-134 03/15/07 06/29/07 09/18/07 03/15/07 06/29/07 09/18/07 03/15/07 06/29/07 09/18/07 03/15/07 06/29/07 09/18/07

-22.0 +/- 35.0 28.0 +/- 20.0 5.0 +/- 29.0 Fe-59

-3.0 +/- 7.2 2.4 +/- 4.9 0.5 +/- 6.7 Nb-95

-2.2 +/-4.6 1.0 +/-2.4 0.9 +/-4.1

-0.3 +/- 3.5 0.0 +/- 2.2 2.1 +/- 3.2 1-131 3.8 +/-8.1 12.4 +/-8.3

-6.5 +/-7.5 Ru-106 7.0 +/- 31.0 10.0:+/- 20.0

-12.0 +/- 30.0 0.0 +/- 34.0

-23.0 +/- 24.0

-11.0 +/- 34.0 K-40 5.0 +/- 45.0 9.0 +/- 34.0

-34.0 +/- 44.0 Sb-125 6.3 +/- 8.8

-3.8 +/- 5.6

-0.9 +/- 9.3

-0.7 +/- 3.4

-1.0 +/- 2.0

-0.7 +/- 3.6 La-140 7.7 +/- 7.3 0.8 +/- 6.6

-2.1 +/- 6.8 Th-228 5.0.+/- 14.0

-1.1 +/-9.3 2.0 +/-15.0 Mn-54 0.2 +/- 3.1 2.1 +/- 1.9 4.0 +/- 3.7 Zn-65 11.0+/- 13.0

-5.0 +/- 5.0 11.0+/- 14.0 Zr-95 0.4 +/- 6.1

-0.5 +/- 3.6

-0.4 +/- 5.9 76-X

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental -Operating Report 2007 Table 10, Well Water (pCi/L)

Page 2 of 6 Location Collection Date Isotope 76-X 03/14/07 06/28/07 09/12/07 12/12/07 03/14/07 06/28/07 09/12/07 12/12/07 03/14/07 06/28/07 09/12/07 12/12/07 03/14/07 06/28/07 09/12/07 12/12/07 Ba-140 2.3 +/- 6.4 1.7 +/- 3.7 1.2 +/- 6.2

-1.4 + 6.7 Cs-137

-5.5 +/- 4.2 0.2 +/- 1.4

-2.6 +/- 3.9 0.1 +/- 3.5 Mn-54

-2.1 +/-3.9 0.7 +/- 1.4

-2.6 +/- 3.4

-0.8 +/- 3.7 Zn-65 Be-7 5.0+/-40.0

-5.0+/- 13.0

-9.0+/-31.0 20.0 +/- 30.0 Fe-59 1.2+/-9.7 1.0 +/- 3.3

-3.0 +/- 7.8

-3.4 +/- 7.9 Nb-95

-2.3 +/- 5.3

-0.1 +/- 1.8

-4.6 +/- 4.2

-1.3 +/- 5.1 Zr-95

-12.2 +/- 8.2 0.5 + 2.7

-5.2 +/- 7.1 0.0 +/- 6.3 Be-7 3.0 +/- 29.0

-20.0 +/- 33.0 Fe-59

-4.3 +/- 7.8

-6.3 +/- 8.1 Nb-95 0.4 +/- 7.0

-1.7 z 5.4 Co-58 0.7 +/- 4.1

-0.6 +/- 1.4 2.1 +/- 3.7 3.0 +/- 3.7 H-3 480.0 +/- 860.0

-20.0 + 810.0 630.0 + 880.0 430.0 + 900.0 Ru-103

-0.9 +/- 5.2

-1.8 + 1.6 1.9 +/- 3.7

-2.6 +/- 4.2 Co-58

-4.0 +/- 4.1 0.0 +/- 3.9 H-3

-480.0 + 900.0

-40.0 + 890.0 Ru-103

-1.6 + 4.0 0.0 +/- 4.1 Co-60 0.9 +/- 3.8 1.4+/- 1.4

-0.2 +/- 3.8

-1.8 +/- 4.2 1-131 1.0 +/- 7.9

-2.1+/-5.9 2.8 +/- 6.4 0.7 +/- 7.3 Ru-106 9.0 +/-41.0 10.0 +/-13.0

-14.0 33.0 6.0 +/- 34.0 Cr-51 9.0 +/- 39.0

-6.0 + 16.0 5.0 +/- 32.0

-26.0 +/- 32.0 K-40 23.0 + 60.0 0.0 +/- 28.0 16.0 + 53.0 6.0 +/- 57.0 Sb-125

-2.0 + 12.0

-2.9 - 3.7

-4.4 - 8.9

-0.5 + 9.7 Cs-134 0.3 +/- 4.4 1.2+1.5

-0.8 +/- 3.8 1.8 +/- 3.6 La-140 2.7 +/- 7.4 2.0 +/- 4.3 1.3 +/- 7.1

-1.4 +/- 6.7 Th-228 1.0 15.0 3.3 5.4 5.0 17.0 2.0 17.0

-16.0+/- 13.0

-1.4 +/- 3.0

-7.9 +/- 8.5

-2.5 +/- 9.3 77-X 01/31/07 11/01/07 12/12/07 Ba-140 I

1.1 +/- 6.9 2.5 +/- 7.3 Cs-137 Co-60 1.7 + 3.9

-2.9+4.6 1-131 2.4 +/- 7.0

-2.1 +/-7.0 Ru-106

-5.0 33.0

-15.0 34.0 Cr-51

-19.0 +/- 35.0 4.0 z 32.0 K-40 17.0 + 51.0

-18.0 +/- 74.0 Sb-125 2.1 9.2

-2.0 11.0 Cs-134 2.3 +/- 4.2

-0.2 +/- 4.5 La-140 1.1 +/-6.9 2.5 +/- 7.3 Th-228 1.0+/- 15.0

-6.0 +/- 17.0 11/01/07

-1.7 +/- 3.3 12/12/07

-2.6 +/- 4.0 Mn-54 11/01/07

-0.4 +/- 3.6 12/12/07

-1.8 +/- 4.4 Zn-65 11/01/07 11.0+ 17.0 12/12/07

-1.4 +/- 8.0 Ba-140 Zr-95 78-X 1.5 +/- 6.7

-3.9 +/- 7.2 Be-7 12.0 27.0 3.0 16.0

-19.0 32.0

-2.0 34.0 03/14/07 06/27/07 09/12/07 12/12/07 5.7 +/- 5.5

-3.1 +/-4.6

-0.6+/- 4.8

-2.4 + 6.6 Co-58

-0.3 +/- 3.3 1.3 +/- 2.1

-0.3 +/- 3.8 3.7 +/- 3.8 Co-60

-1.7 +/- 4.0 1.1 +/- 1.8 1.2 +/- 4.2

-1.6 +/- 4.4 Cr-51

-19.0 +/- 31.0 0.0 +/- 21.0

-2.0 +/- 34.0 13.0 +/- 38.0 Cs-134 1.4 +/- 3.6 0.1+/-2.1

-0.3 +/- 3.4 2.9 +/- 3.9

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 10, Well Water (pCi/L)

Page 3 of 6 Location Collection Date Isotope 78-X 03/14/07 06/27/07 09/12/07 12/12/07 03/14/07 06/27/07 09/12/07 12/12/07 03/14/07 06/27/07 09/12/07 12/12/07 Cs-137

-2.4+/-3.6

-0.2 +/- 1.8 0.2+-3.7 3.2 +/-3.7 Mn-54

-0.2+/--3.6

-0.9 +/- 1.8

-2.54+/-3.9 2.3 +/- 4.2 Zn-65 79 03/15/07 06/29/07 09/24/07 11/28/07 12/19/07 03/15/07 06/29/07 09/24/07 11/28/07 12/19/07 03/15/07 06/29/07 09/24/07 11/28/07 12/19/07 03/15/07 06/29/07 09/24/07 11/28/07 12/19/07

-8.0 +/- 7.7

-1.0 +/- 4.4 19.0 +/- 14.0

-0.3 +/- 9.7 Ba-140

-1.0 +/- 6.6

-2.6 +/- 6.3 0.5 +/- 6.9 10.3 +/-7.2

-1.4 +/-5.9 Cs-137

-0.4 +/- 3.4 1.1 +/-2.0

-0.6 +/- 3.5 1.7 +/- 3.9

-3.1+/--2.7 Fe-59

-0.6 +/- 7.4

-2.3 +/- 4.6

-1.0+/- 10.0 0.1 48.7 Nb-95 1.2 +/- 3.7 1.6 +/- 2.5 1.7 +/- 4.7

-1.3 +/- 4.7 Zr-95

-2.9 +/- 5.2

-0.9 +/- 3.5 3.5 +/- 7.1 1.6 +/- 6.8 Be-7

-23.0 +/- 28.0 13.0 +/- 24.0 7.0 +/- 26.0

-16.0 +/- 33.0 2.0 +/- 28.0 Fe-59 1.5 +/- 7.5

-6.0 +/- 5.7 0.9 +/- 7.1 1.3 +/- 8.6 0.0 +/- 6.3 Nb-95

-3.6 +/- 4.4 1.6 +/- 2.8 0.5 +/- 3.8 0.1+/-4.7 1.3 +/- 3.4 Zr-95 0.7 +/- 5.9 1.1 +/-4.4 2.6 +/- 5.6 7.8 +/- 6.7

-3.2 +/- 4.9 H-3 280.0 +/- 840.0 360.0 +/- 820.0 270.0 +/- 860.0 590.0 +/- 910.0 Ru-103

-2.4 +/- 3.7 0.2 +/- 2.4

-1.2 +/- 4.0 2.0 +/- 4.7 1-131 3.3 +/- 6.9

-0.4 +/- 7.8

-2.9+/-6.9 2.5 +/- 7.8 Ru-106

-7.0 +/-34.0

-17.0 +/- 18.0

-13.0 +/- 37.0

-13.0 +/- 38.0 K-40

-38.0 +/-44.0

-5.0 +/-35.0 28.0 +/-51.0

-31.0 +/-53.0 Sb-125

-2.6 +/- 8.9

-2.0 +/- 4.6

-4.5 +/- 9.6

-2.4 +/- 9.4 Co-58

-0.8 +/- 3.5 0.4 +/- 2.4

-1.9 +/- 3.1

-2.4 +/- 3.5

-1.2 +/- 2.7 H-3 Co-60

-0.5 +/- 3.4 1.2 +/- 2.4

-0.6 +/- 3.4 0.7 +/- 4.7 0.7 +/- 2.8 1-131 Mn-54

-220.0 +/- 890.0 480.0 +/- 840.0 90.0 +/- 900.0 570.0 +/-900.0 830.0 +/-910.0 Ru-103

-2.4 +/- 3.0

-1.1 +/- 3.1 0.3 +/- 3.4

-0.4 +/- 3.9

-2.2 +/- 3.7 La-140 6.5 +/- 6.4

-3.6 +/- 5.3

-0.7 +/- 5.6

-2.4 +/- 6.6 Th-228

-3.0+/- 15.0 2.0+/- 11.0 3.0 +/- 16.0

-610 +/- 16.0

-6.2 +/- 7.9

-1.6+/-8.5 0.3 +/- 6.7

-0.8.+/- 8.4 3.0 +/- 7.4 Ru-106 2.0 +/- 28.0

-14.0 +/- 21.0 27.0 +/- 30.0 17.0 +/- 31.0

-16.0 +/- 28.0 Cr-51 14.0 33.0

-9.0 +/-26.0 2.0 +/-29.0 1.0 +/-38.0 9.0 +/-29.0 K-40

-9.0 +/- 44.0 10.0+/- 38.0 16.0 +/- 54.0 92.0 +/- 60.0

-30.0 +/- 47.0 Sb-125

-2.1+/-9.6 3.3 +/- 6.1

-1.7 +/- 7.1

-7.2 +/- 8.7

-4.2 +/- 7.8 Cs-134 0.6 +/- 3.0

-0.4 +/- 2.3 3.5 +/-3.3 0.7 +/- 3.2 2.4 +/- 3.1 La-140

-1.1 +/-7.6

-3.0 +/- 7.2 0.6 +/- 7.9 10.3 +/-7.2

-1.4 +/-5.9 Th-228 13.0 +/- 12.0 7.0 +/- 8.5

-8.0 +/-14.0 10.0+/- 18.0 0.0 +/-12.0

-1.1 +/-3.2

-0.5 +/- 2.2 0.2 +/- 3.0

-1.6 +/- 3.1

-0.6 +/- 2.9 Zn-65 4.0 +/-13.0

-7.5+/- 5.2 3.0 +/-14.0

-0.6 +/- 9.1 11.0 +/-11.0 80

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 10, Well Water (pCiIL)

Page 4 of 6 Location Collection Date Isotope 80 03/19/07 06/29/07 09/20/07 12/19/07 03/19/07 06/29/07 09/20/07 12/19/07 03/19/07 06/29/07 09/20/07 12/19/07 03/19/07 06/29/07 09/20/07 12/19/07 Ba-140

-3.4+/-6.5

-2.2 +/- 5.6 0.0+/-4.7

-5.7 +/- 6.4 Cs-137 1.8 +/- 3.1 0.6+/-2.2

-0.9 +/- 2.0

-1.3 +/- 3.1 Mn-54 0.4 +/- 3.3 0.3 +/- 2.0 0.5 +/- 2.0

-2.2 +/- 2.5 Zn-65

-3.0+/- 13.0 1.4 : 5.1

-6.2 5.8 2.0 11.0 Ba-140 2.5 +/- 6.5 2.0 +/- 3.7

-4.5 +/- 5.6

-2.3 +/- 7.6 Be-7 30.0 27.0

-8.0 18.0

-20.0 +/-20.0

-14.0 24.0 Fe-59

-5.6 +/- 6.5

-0.3 +/- 5.2

-1.5 +/- 5.6

-0.9 +/- 5.6 Nb-95 1.0 +/- 3.9 2.5 +/- 2.7 0.8 + 2.9 1.8 + 3.2 Zr-95

-2.4 +/- 6.2 5.2 +/- 4.0

-0.3 +/- 3.7

-3.1 +4.4 Be-7

-1.0 + 26.0

-7.0 +/- 12.0

-12.0 +/- 25.0 1.0 + 27.0 Fe-59

-6.4 + 7.0 1.9 + 3.4 2.6 + 7.2 3.8 +/- 7.4 Nb-95 1.4 +/- 3.3 1.1 +/- 1.8

-2.1 +/-4.3

-3.7 + 7.0 Zr-95 2.0 + 5.0

-2.9 +/- 2.6

-3.6 +/- 6.0

-5.1 + 6.5 Co-58 0.8 + 3.4 1.0 +/- 2.1

-0.9 + 2.7

-0.3 + 2.9 H-3

-260.0 +/- 890.0 250.0 + 820.0

-20.0 + 920.0

-40.0 + 890.0 Ru-103

-0.9 +/- 3.9 0.2 + 2.6

-1.8 + 3.0

-1.8 + 2.9 Co-58 0.2 + 2.9

-1.5 +/- 1.5

-0.8 +/- 3.6 0.2 + 3.2 H-3

-490.0 + 870.0 510.0 + 830.0 930.0 + 900.0 520.0 + 910.0 Ru-103

-2.0 +/- 2.9

-0.4 + 1.6 0.4 +/- 3.7

-2.4 + 3.8 Co-60

-1.0 + 2.9

-1.3 + 2.6 2.2 +/- 2.5

-1.2 + 2.5 1-131

-2.1 +/- 7.2

-2.1 + 8.3 0.8 + 7.2

-4.2 +/- 8.0 Ru-106

-11.0 + 29.0 3.0 +/- 20.0

-10.0 + 21.0 13.0 + 27.0 Cr-51 0.0 +31.0 13.0 +23.0

-7.0 28.0 2.0 +29.0 K-40

-19.0:+ 45.0 16.0 43.0 8.0 +31.0 15.0 41.0 Sb-125

-1.1 + 7.6 1.5 + 5.6

-1.0:+ 6.4

-5.9 + 6.7 Cs-134 3.5 + 3.2 1.4 + 2.4

-1.2 +/- 2.3

-2.4 + 2.9 La-140

-3.9 + 7.5

-2.5 +/- 6.5 0.0 + 5.5

-5.7 + 6.4 Th-228 9.0+13.0 6.4 +8.3

-4.7 +8.1 1.0+ 11.0 81 03/20/07 06/28/07 09/19/07 12/26/07 03/20/07 06/28/07 09/19/07 12/26/07 03/20/07 06/28/07 09/19/07 12/26/07 03/20/07 06/28/07 09/19/07 12/26/07 Cs-137

-0.1 +2.9 1.5 + 1.4

-1.9 + 3.3

-2.2 + 3.3 Co-60

-0.2 + 2.8 0.5 +/- 1.4

-0.6 + 3.2 0.0 + 3.3 1-131

-1.5 + 8.0 7.7 + 6.0 2.3 + 5.9

-0.9 +/- 7.4 Ru-106

-4.0 + 27.0 4.0+ 13.0

-24.0 + 33.0

-21.0 + 32.0 Cr-51 29.0 +33.0 0.0 +16.0

-27.0 +29.0

-5.0 +34.0 K-40

-13.0 + 37.0 14.0 + 27.0

-13.0 + 48.0 22.0 + 56.0 Sb-125 0.0 +/- 6.8 1.5 + 3.7

-2.4 + 8.4

-4.5 + 8.9 Cs-134 0.0 + 3.3

-0.5 + 1.4

-0.2 + 3.6

-2.0 + 3.6 La-140 2.8 + 7.4 2.3 + 4.3

-5.2 + 6.4

-2.3 + 7.6 Th-228 0.0 +/- 10.0 0.1 +7.1

-1.0+ 14.0 0.0+ 14.0 Mn-54

-1.2 2.9 0.8 +1.3

-0.2 +3.0 1.8 +3.3 Zn-65

-8.6 + 6.9

-1.5 + 3.0

-1.2 + 6.4

-9.0 + 15.0

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 10, Well Water (pCi/L)

Page 5 of 6 Location Collection Date Isotope 82 03/22/07 06/29/07 09/20/07 12/07/07 03/22/07 06/29/07 09/20/07 12/07/07 03/22/07 06/29/07 09/20/07 12/07/07 03/22/07 06/29/07 09/20/07 12/07/07 Ba-140

-3.2+/-5.5 3.2+/-3.6 0.7+/-4.3 1.4 +/- 6.2 Cs-137

-0.8 +/- 3.5 1.0+/- 1.4 1.8 +/- 2.4 1.1+/-2.2 Mn-54

-0.8 +/- 3.7 0.3 +/- 1.4

-0.8 +/- 2.4 0.0 +/- 2.6 Zn-65 1.0+/- 15.0

-2.5+/- 3.4 13.3 +/-9.7

-5.0+/- 11.0 Ba-140 2.3 +/- 5.6

-0.4 +/- 5.8

-1.6 +/- 6.7 Be-7

-4.0 +/- 33.0 5.0 +/- 13.0 2.0 +/- 23.0

-2.0 +/- 20.0 Fe-59 7.2 +/-7.9 2.8 +/-3.5

-3.3 +/-5.5 0.7 +/-5.8 Nb-95

-1.7 +/- 4.5 1.1 +/-2.0

-1.5 +/- 2.9 0.5 +/- 3.2 Zr-95 7.4 +/- 5.9

-0.3 +/- 2.8 1.0 +/- 4.0

-1.7 +/- 4.7 Be-7

-10.0 +/- 17.0

-47.0 +/- 35.0

-17.0 +/- 32.0 Fe-59 2.3 +/- 4.7 0.9 +/- 7.3 1.3 +/- 6.9 Nb-95

-1.7 +/- 2.8 2.5 +/- 6.8

-2.2 +/- 3.7 Zr-95

-1.8 +/- 3.6

-1.7 +/- 6.5

-1.3 +/- 5.5 Co-58

-2.5 +/- 3.7

-1.0 +/- 1.5

-2.2 +/- 2.4

-2.6 +/- 2.5 H-3 120.0 +/- 890.0 710.0 +/- 850.0 490.0 +/- 910.0 1170.0 +/- 930.0 Ru-103

-2.9 +/- 4.0

-0.9 +/- 1.9

-1.3 +/- 2.8

-1.3 +/- 2.5 Co-58

-0.9 +/- 2.1

-3.4 +/- 4.0

-2.6 +/- 3.3 H-3

-80.0 +/- 800.0 20.0 +/- 860.0 130.0 +/- 890.0 Ru-103

-2.7 +/- 2.2

-0.2 +/- 3.9

-2.5 +/- 4.0 Co-60 0.6 +/- 3.5 0.0+/-1.5 1.6+/-1.9 0.6 +/- 3.1 1-131 6.1 +/- 8.9

-0.8 +/- 5.4

-4.5 +/- 7.9

-1.9 +/- 6.2 Ru-106

-6.0 +/- 33.0 3.0 +/- 14.0

-10.0 +/- 20.0 7.0 +/- 21.0 Cr-51

-7.0 +/- 36.0 9.0+/- 16.0 6.0 +/- 28.0

-4.0 +/- 20.0 K-40 29.0 +/-44.0 7.0 +/-29.0

-11.0 +/-27.0 31.0 +/-31.0 Sb-125

-3.5 +/- 8.9 1.0 +/- 3.6 0.9 +/- 7.0 4.2 +/- 6.1 Cs-134

-2.1+/-4.0 0.4 +/- 1.6 0.6 +/- 2.3 1.1 +/- 2.7 La-140

-3.7 +/- 6.3 3.7 +/- 4.2 0.8 +/- 4.9 1.4 +/- 6.2 Th-228

-10.0 +/-12.0

-3.2 9.0

-0.8 7.1 13.0 +/-10.0 83 06/29/07 09/19/07 11/28/07 06/29/07 09/19/07 11/28/07 06/29/07 09/19/07 11/28/07 06/29/07 09/19/07 11/28/07 Co-60

-0.6 +/- 2.2

-1.9+/-3.5

-0.5 +/- 3.2 1-131 Cs-137 0.5 +/- 1.7 0.0 +/- 4.2

-0.4 +/- 3.0 Mn-54

-0.5 +/- 2.1

-1.9 +/- 3.4

-0.5 +/- 3.0 Zn-65 3.9 4.4 8.0+/- 18.0 5.0+/- 14.0

-0.9 +/- 6.6

-6.7 +/- 7.5

-4.2 +/- 8.1 Ru-106 10.0+/- 16.0

-43.0 +/- 34.0

-17.0 +/- 30.0 Cr-51

-8.0 +/-19.0 24.0 +/-37.0 3.0 +/-31.0 K-40

-7.0 +/- 41.0 19.0:+/- 59.0 5.0 +/- 50.0 Sb-125

-3.9+/-4.8

-1.0+/- 10.0 1.8 +/-8.2 Cs-134 0.2 +/- 2.2

-2.3 +/-4.0 4.0 +/- 3.2 La-140 2.7 +/- 6.5

-0.5 +/- 6.7

-1.6 +/- 6.7 Th-228 5.4 +/-6.6

-2.0 +/-15.0 8.0 +/-12.0 84

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 10, Well Water (pCi/L)

Page 6 of 6 Location Collection Date Isotope 84 85 Ba-140 12/08/07 3.7 +/- 7.0 Cs-137 12/08/07

-2.1 +/- 2.1 Mn-54 12/08/07 0.1 +/- 2.5 Zn-65 12/08/07

-1.8 +/- 9.4 Ba-140 11/28/07

-3.8 +/- 7.3 Cs-137 11/28/07

-1.4 +/- 3.1 Mn-54 11/28/07

-0.8 +/- 3.4 Zn-65 11/28/07

-5.9 +/- 7.3 Ba-140 12/07/07 0.0 +/- 6.2 Cs-137 12/07/07

-2.0 +/- 2.4 Mn-54 12/07/07 1.0 +/- 2.6 Zn-65 12/07/07 1.8 +/- 9.3 Be-7

-18.0 +/- 20.0 Fe-59

-2.3 +/- 5.5 Nb-95

-1.1 +/- 2.7 Zr-95 Co-58 1.0 +/- 2.3 H-3

-390.0 +/- 870.0 Ru-103

-0.3 +/- 2.2 Co-60 1.2 +/- 2.4 1-131

-0.4 +/- 6.3 Ru-106

-11.0 +/- 20.0 Cr-51

-22.0 +/- 23.0 K-40 14.0 +/- 56.0 Sb-125 1.0 +/- 5.7 Cs-134 0.6 +/- 3.2 La-140 3.7 +/- 7.0 Th-228 15.0 +/- 10.0 5.1 +/- 5.1 Be-7 32.0 +/- 28.0 Fe-59 0.0 +/--6.9 Nb-95 2.4 +/-4.8 Zr-95 4.7 +/- 6.5 Be-7 3.0 +/- 19.0 Fe-59

-3.4 +/- 5.7 Nb-95 0.9 +/- 2.9 Zr-95 4.8 +/- 4.6 Co-58

-1.0 +/- 3.2 H-3 700.0 +/- 900.0 Ru-103

-0.8 +/- 3.2 Co-60 0.3 +/- 3.2 1-131 3.2 +/- 8.2 Ru-106

-7.0 +/- 30.0 Cr-51

-4.0 +/- 31.0 K-40

-47.0 +/- 52.0 Sb-125

-3.9 +/- 8.4 Cs-134

-0.9 +/- 3.6 La-140

-4.8 +/- 7.0 Th-228

-18.0 +/- 15.0 86 Co-58

-1.7 +/- 2.5 H-3 130.0 +/- 890.0 Ru-103

-3.7 +/- 3.1 Co-60 0.1 +/-2.3 1-131 3.0 +/- 7.8 Ru-106 9.0 +/- 24.0 Cr-51

-14.0 +/- 24.0 K-40

-2.0 +/- 41.0 Sb-125

-6.8 +/- 6.1 Cs-134

-2.9 +/- 2.6 La-140 0.0 +/- 6.2 Th-228 1.0 +/- 10.0

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 12, Fruits & Vegetables (pCi/g)

Page 1 of 2 Location Collection Date Sample Type Isotope 25 06/19/07 06/19/07 08/22/07 08/23/07 09/05/07 06/19/07 06/19/07 08/22/07 08/23/07 09/05/07 06/19/07 06/19/07 08/22/07 08/23/07 09/05/07 06/19/07 06/19/07 08/22/07 08/23/07 09/05/07 06/19/07 06/19/07 08/22/07 08/23/07 09/05/07 Ba-140 LETTUCE

-0.003 +/- 0.015 STRAWBERRIES -0.002 +/- 0.018 PEACHES 0.016 +/- 0.026 KALE 0.014 +/- 0.029 SWISS CHARD

-0.011 +/- 0.026 Co-60 LETTUCE

-0.002 +/- 0.006 STRAWBERRIES 0.002 +/- 0.006 PEACHES

-0.004 +/- 0.015 KALE 0.005 +/- 0.023 SWISS CHARD

-0.018 +/- 0.022 1-131 LETTUCE 0.002 +/- 0.033 STRAWBERRIES -0.001 +/- 0.031 PEACHES

-0.003 +/- 0.019 KALE 0.012 +/- 0.034 SWISS CHARD

-0.012 +/- 0.026 Be-7 0.151 +/-0.088 0.025 +/- 0.056 0.020 +/- 0.120 0.150 +0.170 0.000 +/- 0.160 Cr-51

-0.016 +/- 0.081 0.013 +/- 0.072 0.000 + 0.120 0.010+/- 0.160

-0.010 +/- 0.140 K-40 1.790 +/- 0.170 1.170 +/- 0.140 1.240 +/- 0.420 4.050 +/- 0.600 4.600 +/- 0.800 Ru-106

-0.011 +/- 0.065

-0.011 +/- 0.057

-0.013 +/- 0.097 0.020 +/- 0.180 0.050 +/- 0.170 Ce-141

-0.005 +/- 0.012

-0.036 +/- 0.017

-0.007 +/- 0.018 0.011 +/- 0.028 0.004 +/- 0.023 Cs-134 0.005 +/- 0.007 0.001 +/- 0.006 0.001 +/- 0.019 0.010 +/- 0.022 0.021 +/- 0.020 La-140

-0.003 +/- 0.017

-0.003 +/- 0.021 0.019 + 0.030 0.016 +/- 0.033

-0.012 +/- 0.030 Sb-125

-0.001 +/- 0.017

-0.003 +/- 0.015

-0.003 +/- 0.043

-0.011 +/- 0.050

-0.008 +/- 0.044 Ce-144 0.004 +/- 0.034

-0.012 +/- 0.031 0.000 +/- 0.061

-0.030 +/- 0.100 0.018 +/- 0.077 Cs-137 0.002 +/- 0.007

-0.003 +/- 0.006

-0.002 +/- 0.015 0.013 +/- 0.021

-0.006 +/- 0.019 Mn-54 0.000 +/- 0.006 0.004 +/- 0.006

-0.003 +/- 0.017 0.017 +/- 0.021 0.001 +/- 0.020 Th-228

-0.011 +/- 0.026 0.028 +/- 0.021 0.028 +/- 0.060 0.046 +/- 0.092 0.000 +/- 0.077 Co-58

-0.001 +/- 0.007 0.005 +/- 0.007 0.012 +/- 0.011 0.009 +/- 0.023

-0.005 +/- 0.019 Fe-59 0.004 +/- 0.018

-0.016 +/- 0.015

-0.026 +/- 0.032 0.002 +/- 0.048 0.000 +/- 0.044 Nb-95

-0.005 +/- 0.009

-0.004 +/- 0.009

-0.008 +/- 0.022

-0.012 +/- 0.024

-0.001 +/- 0.021 Zn-65

-0.001 +/- 0.015

-0.010 +/- 0.013 0.013 +/- 0.034

-0.025 +/- 0.052

-0.037 +/- 0.050 LETTUCE STRAWBERRIES PEACHES KALE SWISS CHARD Ru-103 0.008 +/- 0.008 0.000 +/- 0.008 0.004 +/- 0.016 0.010 +/- 0.022 0.003 +/- 0.022 Zr-95 LETTUCE 0.002 +/- 0.013 STRAWBERRIES -0.001 +/- 0.011 PEACHES 0.005 +/- 0.030 KALE

-0.008 +/- 0.035 SWISS CHARD

-0.024 +/-0.041 26-C Ba-140 06/19/07 LETTUCE 0.001 +/- 0.017 06/19/07 STRAWBERRIES -0.004 +/- 0.026 08/22/07 LETTUCE

-0.034 +/- 0.034 08/22/07 PEACHES 0.009 +/- 0.021 Co-60 06/19/07 LETTUCE 0.001 +/- 0.006 06/19/07 STRAWBERRIES -0.005 +/- 0.009 08/22/07 LETTUCE 0.009 +/- 0.022 08/22/07 PEACHES 0.007 +/- 0.014 1-131 06/19/07 LETTUCE

-0.007 +/- 0.033 06/19/07 STRAWBERRIES 0.014 +/- 0.035 08/22/07 LETTUCE

-0.002 +/- 0.031 08/22/07 PEACHES

-0.020 +/- 0.028 Ru-103 06/19/07 LETTUCE

-0.006+/- 0.007 06/19/07 STRAWBERRIES 0.001 +/- 0.010 Be-7 0.023 +/- 0.058 0.095 +/- 0.070 0.130 +/- 0.170

-0.030 +/- 0.150 Cr-51

-0.041 +/- 0.077 0.052 +/- 0.077 0.080 +/- 0.150 0.040 +/- 0.160 K-40 3.060 +/- 0.190 1.140 +/- 0.190 2.780 +/- 0.620 1.410 +/- 0.420 Ru-106 0.018 +/- 0.057

-0.032 +/- 0.063 Ce-141

-0.005 +/- 0.011

-0.012 +/- 0.012 0.002 +/- 0.024 0.000 +/- 0.022 Cs-134 0.002 +/- 0.006 0.001 +/- 0.009 0.015 +/- 0.022 0.016 +/- 0.017 La-140 0.002 +/- 0.019

-0.004 +/- 0.030

-0.039 +/- 0.039 0.010 +/- 0.024 Sb-125

-0.003 +/- 0.015

-0.001 +/- 0.019 Ce-144

-0.030 +/- 0.030

-0.006 +/- 0.029 0.073 +/- 0.089 0.005 +/- 0.087 Cs-137 0.004 +/- 0.006 0.005 +/- 0.008

-0.002 +/- 0.026

-0.003 +/- 0.019 Mn-54 0.000 +/- 0.006 0.000 +/- 0.007

-0.007 +/- 0.018 0.000 +/- 0.012 Th-228 0.033 +/- 0.030 0.007 +/- 0.038 Co-58

-0.003 +/- 0.006 0.002 +/- 0.008

-0.010 +/- 0.019 0.003 +/- 0.014 Fe-59 0.002 +/- 0.015

-0.009 +/- 0.019 0.027 +/- 0.044 0.022 +/- 0.037 Nb-95

-0.004 +/- 0.009 0.001 +/- 0.011 0.003 +/- 0.023 0.022 +/- 0.018 Zn-65 0.003 +/- 0.014

-0.019 +/- 0.018

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 12, Fruits & Vegetables (pCi/g)

Page 2 of 2 Location Collection Sample Type Date Isotope 26-C 08/22/07 LETTUCE 08/22/07 PEACHES Ru-103 0.004 +/- 0.017 0.001 +/- 0.016 Zr-95 0.001 +/- 0.011 0.000 +/- 0.015 0.001 +/- 0.035

-0.017 +/- 0.025 Ru-106

-0.010 + 0.170 0.080 + 0.140 Sb-125

-0.054 +/- 0.048

-0.036 +/- 0.046 Th-228

-0.013 +/- 0.087

-0.031 +/- 0.055 Zn-65 0.009 +/- 0.049

-0.024 +/- 0.032 06/19/07 06/19/07 08/22/07 08/22/07 LETTUCE STRAWBERRIES LETTUCE PEACHES

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 13, Broadleaf Vegetation (pCi/g)

Page 1 of 2 Location Collection Isotope Date 01 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 05/23/07 0.062 +/- 0.074 06/20/07 0.012 +/- 0.063 07/25/07 0.004 + 0.037 08/15/07 -0.007 + 0.047 09/19/07 0.014+ 0.058 10/29/07 -0.020 + 0.110 Cr-51 05/23/07 -0.110 +/- 0.230 06/20/07 0.200 +/- 0.240 07/25/07 -0.020 +/- 0.200 08/15/07 -0.130 +/- 0.230 09/19/07 0.070 + 0.270 10/29/07 -0.120 +/- 0.300 La-140 05/23/07 0.071 +/- 0.085 06/20/07 0.014 +/- 0.072 07/25/07 0.004 +/- 0.042 08/15/07 -0.008 +/- 0.054 09/19/07 0.016 +/- 0.066 10/29/07 -0.020 + 0.110 Th-228 05/23/07 -0.020 +/- 0.110 06/20/07 0.009 +/- 0.075 07/25/07 0.045 +/- 0.085 08/15/07 0.140 +/- 0.130 09/19/07 -0.020 +/- 0.110 10/29/07 0.160 +/- 0.120 Ba-140 05/23/07 0.023 +/- 0.087 06/20/07 -0.010 +/- 0.100 07/25/07 -0.005 +/- 0.037 08/15/07 0.036 +/- 0.037 09/19/07 0.016 +/- 0.050 10/29/07 -0.019 +/- 0.076 Cr-51 05/23/07 -0.190 +/- 0.250 06/20/07 0.090 +/- 0.230 07/25/07 0.220 +/- 0.220 08/15/07 0.010 +/- 0.180 09/19/07 0.020 +/- 0.210 10/29/07 -0.100 +/- 0.250 0.350 +/- 0.270

-0.020 +/- 0.033 0.022 +/- 0.088

-0.009 +/- 0.042 0.011 +/- 0.044 0.400 +/- 0.280 0.006 +/- 0.032,

-0.074 +/- 0.081

-0.004 +/- 0.021 0.013 +/- 0.019 0.630 +/- 0.250

-0.018 +/- 0.029

-0.001 +/- 0.082

-0.020 +/- 0.021 0.005 +/- 0.019 0.890 + 0.380

-0.012 +/- 0.036

-0.080 +/- 0.130 0.010 +/- 0.030 0.005 +/- 0.033 0.810 +/- 0.390

-0.019 +/- 0.037

-0.040 +/- 0.150

-0.003 +/- 0.031 0.000 +/- 0.028 3.550 +/- 0.720

-0.011 +/- 0.041 0.040 +/- 0.110

-0.003 +/- 0.041

-0.004 +/- 0.042 Cs-134 Cs-137 Fe-59 1-131 K-40 0.011 +/- 0.031

.0.003 +/- 0.024 0.000 +/- 0.053 0.004 +/- 0.078 3.900 +/- 1.000 0.003 +/- 0.023

-0.010 + 0.015

-0.012 +/- 0.046 0.150 +/- 0.120 2.820 +/- 0.490

-0.004 +/- 0.021 0.024 +/- 0.021 0.046 +/- 0.042 0.005 +/- 0.046 2.260 +/- 0.490 0.021 +/- 0.034

-0.020 + 0.031 0.041 +/- 0.068

-0.026 +/- 0.045 3.500 +/- 1.000 0.006 +/- 0.031 0.016 + 0.029

-0.035 +/- 0.069 0.038 + 0.051 3.480 +/- 0.820 0.051 +/- 0.036

-0.010 +/- 0.028

-0.042 +/- 0.085

-0.032 +/- 0.078 2.550 +/- 0.890 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 0.028 +/- 0.027

-0.003 +/- 0.025

-0.003 +/- 0.029

-0.030 +/- 0.210

-0.030 +/- 0.070

-0.022 + 0.021

-0.001 +/- 0.029

-0.015 +/- 0.024 0.100 +/- 0.170 0.009 +/- 0.044 0.019 +/- 0.021

-0.015 +/- 0.021

-0.004 +/- 0.024

-0.070 +/- 0.170 0.016 +/- 0.046

-0.013 +/- 0.031 0.007 +/- 0.033

-0.009 +/- 0.030

-0.100 +/- 0.270 0.000 +/- 0.068

-0.028 +/- 0.035 0.021 +/- 0.037

-0.022 +/- 0.030

-0.230 +/- 0.320 0.067 + 0.071 0.024 + 0.030

-0.014 +/- 0.049 0.003 +/- 0.030

-0.170 +/- 0.290

-0.059 +/- 0.073 Zn-65 Zr-95 0.061 +/- 0.091

-0.0 18 + 0.063 0.000 +/- 0.045 0.028 +/- 0.037

-0.018 +/- 0.052 0.005 +/- 0.033 0.031 +/- 0.080

-0.011 +/- 0.051

-0.019 +/- 0.078 0.025 +/- 0.060

-0.058 +/- 0.095

-0.029 +/- 0.052 10 Be-7 Ce-141 Ce-144 Co-58 Co-60 0.220 + 0.300

-0.040 +/- 0.038

-0.090 + 0.110

-0.022 +/- 0.029

-0.025 +/- 0.039 0.230 +/- 0.260

-0.007 +/- 0.033

-0.061 +/- 0.095 0.018 +/- 0.025

-0.018 + 0.027 0.230 +/- 0.250

-0.019 +/- 0.034 0.000 +/- 0.120 0.025 +/- 0.026

-0.034 +/- 0.029 0.310 +/- 0.310 0.004 +/- 0.028

-0.045 +/- 0.094 0.019 +/- 0.025 0.007 + 0.030 0.280 +/- 0.290

-0.012 +/- 0.030 0.050 +/- 0.100 0.007 +/- 0.027 0.015 + 0.035 0.940 +/- 0.400 0.008 + 0.037 0.000 +/- 0.100

-0.010 +/- 0.028

-0.010 +/- 0.028 Cs-134 Cs-137 Fe-59 1-131 K-40 0.015 +/- 0.031 0.005 +/- 0.035

-0.018 +/- 0.088

-0.019 +/- 0.081 3.750 +/- 0.970 0.012 +/- 0.024 0.005 +/- 0.023

-0.035 +/- 0.055

-0.180 +/- 0.110 3.500 +/- 0.730 0.013 +/- 0.029 0.020 +/- 0.029 0.007 +/- 0.054 0.024 +/- 0.048 3.390 +/- 0.730 0.007 +/- 0.025 0.014 +/- 0.030 0.030 +/- 0.052 0.012 +/- 0.029 4.420 +/- 0.960 0.021 +/- 0.031 0.007 +/- 0.026

-0.023 +/- 0.051 0.026 +/- 0.042 3.480 +/- 0.830 0.005 +/- 0.030

-0.004 +/- 0.027 0.043 +/- 0.063 0.019 +/- 0.086 4.120 + 0.820

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 Table 13, Broadleaf Vegetation (pCi/g)

Page 2 of 2 Location Collection Isotope Date 10 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 05/23/07 0.030 +/- 0.100

-0.002 +/- 0.027 0.004 +/- 0.029 0.008 +/- 0.032

-0.140 +/- 0.340 0.023 +/- 0.071 06/20/07 -0.010 +/- 0.120 0.007 +/- 0.024 0.007 +/- 0.031

-0.004 +/- 0.028 0.000 4 0.210 0.019 +/- 0.060 07/25/07 -0.006 +/- 0.043 0.018 +/- 0.026

-0.023 +/- 0.032 0.013 +/- 0.030

-0.140 +/- 0.290 0.035 +/- 0.053 08/15/07 0.042 +/- 0.043

-0.003 +/- 0.024

-0.008 +/- 0.030 0.000 +/- 0.022 0.120 4 0.210 0.032 +/- 0.059 09/19/07 0.018 +/- 0.058 0.004 +/- 0.025 0.010 +/- 0.029

-0.009 +/- 0.023 0.150 +/- 0.260 0.022 +/- 0.065 10/29/07 -0.019 +/- 0.076

-0.005 +/- 0.024

-0.015 +/- 0.033

-0.008 +/- 0.027 0.030 +/- 0.240

-0.019 +/- 0.058 Th-228 Zn-65 Zr-95 05/23/07 0.030 + 0.140 0.067 + 0.082 0.019 +/- 0.051 06/20/07 0.075 +/- 0.092

-0.005 +/- 0.055

-0.013 +/- 0.043 07/25/07 0.070 +/- 0.130 0.042 +/- 0.060 0.004 +/- 0.051 08/15/07 0.100+/-0.120

-0.031 +/--0.069

-0.010 +/-0.038 09/19/07 0.150 +/- 0.130

-0.054 +/- 0.060 0.043 +/- 0.051 10/29/07 0.040 +/- 0.130 0.006 +/- 0.056

-0.015 +/- 0.050 17 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 05/23/07 0.011 +/- 0.039 0.520 +/- 0.320

-0.005 +/- 0.032

-0.026 +/- 0.078 0.007 +/- 0.028 0.006 +/- 0.037 06/20/07 -0.021 +/- 0.086 0.320 + 0.300 0.019 +/- 0.047 0.020 +/- 0.110

-0.015 +/- 0.029

-0.008 +/- 0.021 07/25/07 0.016 +/- 0.049 0.590 +/- 0.370 0.004 +/- 0.030 0.020 +/- 0.100 0.001 +/- 0.025

-0.007 - 0.029 08/15/07 -0.023 +/- 0.032 0.870 +/- 0.290 0.007 +/- 0.025 0.015 +/- 0.094 0.016 +/- 0.018

-0.014 +/- 0.024 09/19/07 -0.008 +/- 0.030 0.700 +/- 0.360

-0.024 +/- 0.037 0.090 +/- 0.120 0.012 +/- 0.024 0.020 - 0.029 10/29/07 -0.035 +/- 0.070 1.460 +/- 0.400 0.018 +/- 0.039 0.060 +/- 0.110

-0.028 +/- 0.025 0.004 +/- 0.025 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 05/23/07 0.110 +/- 0.220

-0.001 +/- 0.030 0.014 +/- 0.030

-0.017 +/- 0.060 0.012 +/- 0.066 3.690 +/- 0.890 06/20/07 -0.170 +/- 0.350 0.004 +/- 0.027 0.010 +/- 0.026

-0.009 +/- 0.061 0.040 + 0.210 2.270 +/- 0.570 07/25/07 -0.090 +/- 0.220

-0.008 +/- 0.029 0.024 +/- 0.028 0.015 +/- 0.057

-0.009 +/- 0.045 2.310 +/- 0.760 08/15/07 -0.030 +/- 0.180 0.009 +/- 0.026 0.004 +/- 0.022

-0.017 +/- 0.039

-0.012 +/- 0.033 2.930 +/- 0.550 09/19/07 -0.050 +/- 0.290 0.003 +/- 0.030 0.022 +/- 0.036

-0.021 +/- 0.059 0.014 + 0.049 2.900 +/- 0.750 10/29/07 0.170 +/- 0.280

-0.015 +/- 0.026

-0.002 +/- 0.026 0.000 +/- 0.057

-0.050 +/- 0.096 2.850 +/- 0.620 1

La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 05/23/07 0.013 +/- 0.045

-0.007 +/- 0.026 0.012 +/- 0.029 0.003 +/- 0.023 0.050 +/- 0.200 0.005 +/- 0.061 06/20/07 -0.025 +/- 0.099

-0.015 +/- 0.027 0.006 +/- 0.041

-0.002 +/- 0.031

-0.060 +/- 0.220 0.000 +/- 0.064 07/25/07 0.018 +/- 0.057

-0.017 +/- 0.030 0.013 +/- 0.027

-0.002 +/- 0.024 0.160 +/- 0.200

-0.006 +/- 0.064 08/15/07 -0.027 +/- 0.037 0.003 +/- 0.021 0.013 +/- 0.024

-0.017 +/- 0.020 0.110 +/- 0.180

-0.024 +/- 0.054 09/19/07 -0.009 +/- 0.035 0.023 +/- 0.027 0.000 +/- 0.026 0.023 +/- 0.028

-0.170 +/- 0.270

-0.044 +/- 0.071 10/29/07 -0.035 +/- 0.070

-0.003 +/- 0.022 0.019 +/- 0.027

-0.006 +/- 0.030 0.060 +/- 0.260

-0.047 +/- 0.060 Th-228 Zn-65 Zr-95 05/23/07 0.047 +/- 0.099

-0.057 +/- 0.058 0.023 +/- 0.051 06/20/07 0.070 +/- 0.120

-0.003 +/- 0.066

-0.011 +/- 0.060 07/25/07 0.000 +/- 0.110

-0.046 +/- 0.062 0.038 +/- 0.051 08/15/07 0.165.+/- 0.099

-0.006 + 0.049 0.015 +/- 0.036 09/19/07 0.070'+/- 0.120

-0.010 +/- 0.065 0.042 +/- 0.041 10/29/07 0.036 +/- 0.094

-0.015 +/- 0.057 0.029 +/- 0.042

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 14, Sea Water (pCi/L)

Page 1 of 2 Location Collection Date Isotope 32 01/30/07 02/27/07 03/27/07 04/24/07 05/29/07 06/26/07 07/31/07 08/28/07 09/25/07 10/30/07 11/27/07 12/26/07 01/30/07 02/27/07 03/27/07 04/24/07 05/29/07 06/26/07 07/31/07 08/28/07 09/25/07 10/30/07 11/27/07 12/26/07 01/30/07 02/27/07 03/27/07 04/24/07 05/29/07 06/26/07 07/31/07 08/28/07 09/25/07 10/30/07 11/27/07 12/26/07 01/30/07 02/27/07 03/27/07 04/24/07 05/29/07 06/26/07 07/31/07 08/28/07 09/25/07 10/30/07 11/27/07 12/26/07 Ba-140

-1.1 +/- 5.0 0.9+/-5.7

-1.9+/-6.3

-1.8+/-4.6 3.2+/-6.0 0.0+/-6.9 5.0+/-7.5

-0.7 +/- 6.5

-1.1 +/-6.3 1.8 +/- 7.3 3.6 +/- 7.0 3.7 +/- 3.7 Cs-137

-0.2 +/- 2.2 2.4 +/- 3.7

-0.9 +/- 3.7 0.2 +/- 3.0 0.2 +/- 3.0 2.7 +/- 3.0 0.6 +/- 4.5

-2.1+/-4.1 2.0 +/- 3.5 1.6 +/- 4.7

-2.8+4.5

-0.7 +/- 2.5 Be-7

-15.0 +/- 22.0

-20.0 +/- 32.0 0.0 +/- 34.0

-16.0 +/- 24.0

-16.0 +/- 25.0 17.0 +/- 25.0 11.0 +/- 36.0 7.0 +/- 32.0

-13.0 +/- 34.0

-37.0 +/- 31.0

-10.0 +/- 35.0

-2.0 +/- 17.0 Fe-59 3.7 +/- 6.0 5.6 +/- 7.5 3.4 +/- 9.0 3.2 +/- 7.0

-5.9 +/- 7.9

-5.6 +/- 6.9 4.3 +/- 9.0 0.9 +/- 8.7 2.3 +/- 7.1

-2.4 +/- 8.7 5.8 +/- 8.8

-0.6 +/- 4.3 Nb-95 1.3 +/- 2.9

-0.2 +/- 4.3

-3.7 +/- 4.3

-0.4 +/- 3.5 3.9+/-3.9 2.4 +/- 3.6 2.3 +/- 4.2

-1.0 +/- 4.4

-0.8 +/- 3.9 1.2 +/- 4.9 0.0 +/- 4.5 0.8 +/- 2.3 Zr-95 0.7 +/- 4.5

-3.3 +/- 6.7

-4.6 +/- 6.6

-0.7 +/- 5.2 4.2 +/- 6.1

-4.6 +/- 5.4 4.8 +/- 7.8

-0.5 +/- 6.8

-2.5 +/- 5.6 6.2 +/- 7.5 1.1 +/-6.9

-0.6 +/- 3.5 Co-58

-3.2 +/- 2.3

-4.5 +/- 3.5

-0.3 +/- 3.9 2.2 +/- 3.0

-1.3 +/- 3.2

-1.4 + 2.9

-2.1 +/- 4.4

-2.5 +/- 4.0

-0.7 +/- 3.5

-0.4 +/- 4.0

-1.6 +/- 4.1 1.7 +/- 1.9 H-3 Mn-54 580.0 +/- 170.0 1940.0 + 190.0 560.0 180.0 1130.0+/- 180.0 230.0 +/- 160.0

-30.0 +/- 150.0 30.0 +/- 160.0 70.0 +/- 180.0 50.0 +/- 180.0 130.0 +/- 180.0 240.0 +z 180.0 340.0 +/- 180.0 Ru-103

-1.8 +/- 3.1 4.5 +/- 3.6

-2.1 +/- 4.6

-0.9 +/- 3.4

-0.7 +/- 3.3 0.4 +/- 3.4

-3.3 +/- 4.4

-1.2 +/- 4.3 1.0 +/- 3.8

-3.3 +/- 4.3

-2.9 +/- 4.4

-0.9 +/- 2.1 Co-60 0.6 +/- 2.3 0.6 +/- 2.9 0.6 +/- 4.2

-1.5 +/- 3.5

-2.5 +/- 4.3 0.0 +/- 3.2 1.2 +/- 6.2 0.9 +/- 4.5 0.1 +/- 3.8 1.8 +/- 5.1 2.2 +/- 5.2 1.5 +/- 2.0 1-131

-4.0 +/- 7.9

-2.2 +/- 6.9

-5.8 +/- 6.8

-1.8 +/- 5.2

-0.9 +/- 5.1

-3.6 +/- 7.9

-3.7 +/- 6.8 0.8 +/- 8.2

-3.3 +/- 7.5 1.5 +/- 7.0

-0.3 +/- 8.2

-0.7 +/- 4.2 Ru-106

-3.0 +/- 22.0

-7.0 +/- 32.0

-19.0 35.0

-9.0 +31.0 0.0 28.0

-10.0 +/- 29.0 14.0 +/- 41.0 10.0 +/- 36.0 0.0 29.0 10.0 +/-40.0 10.0 38.0

-2.0 +/-19.0 Cr-51

-13.0 +/-24.0

-4.0 +/-35.0 12.0 +35.0 14.0 29.0

-23.0 +24.0 8.0 +/- 28.0

-18.0 +/- 34.0 17.0 +/- 38.0 4.0 +/-35.0 12.0 +/-40.0

-2.0 41.0 11.0 20.0 K-40 299.0 +/- 49.0 175.0 +/- 70.0 277.0 +/- 90.0 303.0 +/- 74.0 244.0 +/- 82.0 308.0 +/- 77.0 250.0 100.0 286.0 +/-89.0 310.0 +/-83.0 410.0 100.0 296.0 +/-95.0 318.0 49.0 Sb-125

-0.7 +/-5.8 2.2 +/- 9.9 3.0 +/-10.0 1.1 8.3 0.0 +/-8.0

-2.8 +/-7.7

-1.0 12.0 7.0 +/-10.0 1.9 +/-9.4 3.0 12.0

-3.0+/- 12.0

-3.1 +/- 5.3 Cs-134 3.9 +/- 2.8 1.0 +/- 3.4 0.5 +/- 4.6

-3.6 +/- 3.0 1.5 +/- 3.7

-2.2 +/- 3.1 4.9+/-4.2

-1.4 +/- 3.7

-1.0 +/- 3.7 3.6 +/- 4.4 0.0 +/- 4.0 1.1+/-2.0 La-140

-1.3 +/- 5.7 1.1 +/- 6.5

-2.2 +/- 7.2

-2.1 +/- 5.2 3.6 +/- 6.9 0.0 +/- 8.0 5.7 +/- 8.7

-0.8 +/- 7.5

-1.3 +/- 7.3 1.8 +/- 7.3 3.6 +/- 7.0 3.7 +/- 3.7 Th-228 8.8 +8.6 9.0 14.0 11.0+ 16.0

-1.0+ 13.0 3.0 15.0

-2.0 +14.0

-21.0+/- 16.0 4.0+/-15.0 7.0+/- 16.0

-13.0 +/-18.0 8.0 +/- 14.0 14.7 +/- 7.0 0.3 +/- 2.4

-0.9 +/- 3.7 1.1++/-4.0 0.2 +/- 3.2 0.8 +/- 3.5

-0.3 +/- 2.8

-2.5 +/- 4.4

-0.3 +/- 3.7 0.2 +/- 3.3 0.8 +/- 3.9

-0.6 +/- 4.0

-0.8 +/- 1.8 Zn-65

-4.1 5.4 6.0 +/-14.0 3.0 8.6

-1.9 +6.8

-2.7 6.4

-2.6 +/-7.3 4.4 +/-9.8

-4.4 8.2

-1.9 8.7

-4.0+/- 11.0

-9.0 +/-10.0 3.6 +/-4.0

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 14, Sea Water (pCi/L)

Page 2 of 2 Location Collection Date Isotope 37-C 03/13/07 06/05/07 09/04/07 12/11/07 03/13/07 06/05/07 09/04/07 12/11/07 03/13/07 06/05/07 09/04/07 12/11/07 03/13/07 06/05/07 09/04/07 12/11/07 Ba-140 2.5 +/- 6.1 5.2 +/- 6.9 0.0 + 5.3

-5.3 +/- 7.0 Cs-137

-1.1 +/- 3.9

-0.7 + 3.6

-0.5 + 3.1 1.0 + 3.7 Be-7 31.0 +/- 29.0 10.0 +/- 30.0

-7.0 +/- 24.0

-27.0 +/- 32.0 Fe-59

-0.6 + 7.7

-1.1 +/- 7.6

-1.8 +/- 7.2

-3.2 + 7.6 Nb-95 0.1 +/-4.2 4.1+/-4.1 0.9 + 3.4

-1.1 +/- 3.7 Zr-95

-1.7 + 5.9 8.8 + 6.8 2.5 +/- 5.8 5.2 + 6.2 Co-58

-1.7 3.5

-1.5 +/- 4.1

-3.6 +/- 3.6

-0.5 +/- 3.8 H-3 Mn-54 150.0 +/- 850.0

-410.0 +/- 850.0 300.0 +/- 170.0 100.0 +/- 180.0 Ru-103

-1.7 + 3.7 2.8 +/- 4.1

-1.1 + 3.2 3.1 +/-4.3 Co-60

-1.5 +/- 4.3

-0.4 +/- 4.8

-0.9 +/- 3.5 0.0 +/- 3.7 1-131 0.6 +/- 6.2 0.0 +/- 6.9 3.5 +/- 4.6

-3.8 +/- 7.0 Ru-106 18.0 + 36.0

-9.0 + 40.0

-7.0 + 26.0 15.0 +/- 34.0 Cr-51

-19.0 + 33.0 2.0 + 35.0

-7.0 + 23.0

-2.0 + 37.0 K-40 205.0 +/- 83.0 253.0 +/- 84.0 315.0 +/- 78.0 278.0 +/- 81.0 Sb-125 3.5 + 8.9

-2.0 11.0

-0.3 +/- 7.8 4.9 +/- 9.3 Cs-134

-2.0 +/- 3.5

-0.6 +/- 4.2

-0.3 +/- 3.3 0.0 +/- 3.4 La-140 2.9 +/- 7.1 6.0 8.0 0.0 6.1

-5.3 7.0 Th-228 1.0 +/- 15.0

-11.0+/- 14.0 0.0 +/- 14.0 5.0+/- 13.0 0.3 +/- 3.4

-2.3 +/- 3.7 0.5 +/- 3.1 1.2 +/- 3.1 Zn-65

-7.3 +/- 8.7 1.1 +/- 7.8 3.6 +/- 7.3

-10.5 +/- 9.0

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 15, Bottom Sediment (pCi/g)

Page 1 of3 Location Collection Date Isotope 29 Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 31 04/30/07 0.009+ 0.030 10/30/07 0.009+ 0.046 Cs-137 04/30/07 0.030 + 0.031 10/30/07 0.015 + 0.055 Ru-103 04/30/07 0.012 +/- 0.041 10/30/07 0.005 + 0.057 Ag-ll0m 04/30/07 -0.005 +/- 0.033 10/26/07 0.009 +/- 0.032 Cs-137 04/30/07 -0.016 +/- 0.030 10/26/07 -0.010 +/- 0.034 Ru-103 04/30/07 -0.010 +/- 0.027 10/26/07 0.028 + 0.049 Ag-ll0m 04/30/07 0.004 + 0.057 11/05/07 -0.031 + 0.051 Cs-137 04/30/07 0.024 + 0.050 11/05/07 0.075 + 0.052 Ru-103 04/30/07 -0.019 +/- 0.054 11/05/07 0.034 + 0.047 Ag-ll0m 04/30/07 -0.007 +/- 0.033 10/25/07 0.000 +/- 0.046 Cs-137 04/30/07 0.015 +/- 0.029 10/25/07 0.005 + 0.050 0.170 + 0.320 0.070 +/- 0.440 Fe-59

-0.003 + 0.081

-0.040 + 0.140 Ru-106

-0.010 + 0.210

-0.260 +/- 0.490 Be-7 0.140 +/- 0.240 0.040 +/- 0.380 Fe-59 0.043 + 0.066 0.040 +/- 0.130 Ru-106 0.040 + 0.230

-0.120 + 0.400 Be-7 0.180 +/- 0.460 0.270 + 0.350 Fe-59

-0.060 + 0.140

-0.010 +/- 0.110 Ru-106 0.170 + 0.390

-0.170 + 0.420 Be-7

-0.060 +/- 0.250 0.330 +/- 0.370 Fe-59

-0.023 +/- 0.031

-0.005 + 0.059 1-131 0.120 + 0.860

-0.042 + 0.093 Sb-125

-0.010 + 0.067 0.030 + 0.130 Co-58 0.023 + 0.029 0.051 + 0.056 1-131

-0.016 + 0.098 0.020 +/- 0.120 Sb-125 0.024 + 0.075 0.010 + 0.120 Co-58

-0.028 + 0.048 0.039 +/- 0.040 1-131 0.080 +/- 0.120

-0.067 + 0.097 Sb-125 0.140 +/- 0.130 0.010 + 0.100 Co-58

-0.007 + 0.023

-0.021 + 0.052 1-131 0.009 + 0.024

-0.046 + 0.052 K-40 16.360 + 0.880 15.400 + 2.300 Th-228 1.200 + 0.100 0.900 +/- 0.260 Co-60

-0.002 + 0.028

-0.061 +/- 0.055 K-40 15.300 +/- 1.200 14.300 +/- 2.100 Th-228 0.550 + 0.130 0.960 + 0.260 Co-60 0.005 + 0.022

-0.017 +/- 0.039 K-40 14.300 +/- 2.000 13.300 +/- 1.900 Th-228 1.010 +/- 0.230 0.580 + 0.170 Co-60

-0.017 + 0.027

-0.013 +/- 0.047 K-40 0.270 +/- 0.550

-0.370 +/- 0.440 Mn-54 0.013 +/- 0.025 0.024 + 0.056 Zn-65

-0.010 + 0.100 0.120 + 0.110 Cr-51

-0.010 +/- 0.330 0.080 +/- 0.470 Mn-54 0.022 +/- 0.024

-0.001 +/- 0.044 Zn-65

-0.047 +/- 0.074

-0.050 +/- 0.120 Cr-51 0.200 + 0.500 0.050 +/- 0.380 Mn-54

-0.003 +/- 0.044 0.012 +/- 0.052 Zn-65 0.030 +/- 0.130

-0.120 +/- 0.120 Cr-51

-0.210 +/- 0.290

-0.230 + 0.400 Mn-54

-0.024 +/- 0.082 0.055 +/- 0.051 Nb-95

-0.010 +/- 0.073 0.001 +/- 0.078 Zr-95 0.067 +/- 0.058

-0.019 +/- 0.082 Cs-134 0.011 +/- 0.034 0.044 + 0.043 Nb-95

-0.003 +/- 0.033

-0.011 +/- 0.062 Zr-95

-0.003 +/- 0.047

-0.044 +/- 0.098 Cs-134

-0.019 +/- 0.042 0.010 +/- 0.046 Nb-95

-0.009 +/- 0.075 0.003 + 0.058 Zr-95 0.000 +/- 0.084 0.092 + 0.091 Cs-134 0.031 +/- 0.029 0.031 +/- 0.043 Nb-95 32 33 0.004 + 0.065 0.050 + 0.088 12.100 + 1.000

-0.060 + 0.140

-0.012 +/- 0.098 15.600 + 2.300 0.008 +/- 0.024 0.021 +/- 0.033 0.029 +/- 0.052

-0.026 +/- 0.065

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 15, Bottom Sediment (pCi/g)

Page 2 of 3 Location Collection Date Isotope 33 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 34 35-X 04/30/07 0.016 + 0.025 10/25/07 -0.037 + 0.049 Ag-il0m 04/30/07 -0.016 + 0.035 10/25/07 -0.007 +/- 0.030 Cs-137 04/30/07 0.005 +/- 0.030 10/25/07 0.023 + 0.030 Ru-103 04/30/07 0.000 +/- 0.031 10/25/07 0.000 +/- 0.031 Ag-il0m 04/30/07 0.048 +/- 0.033 11/05/07 -0.010 +/- 0.055 Cs-137 04/30/07 0.028 +/- 0.035 11/05/07 0.063 +/- 0.071 Ru-103 04/30/07 0.008 +/- 0.045 11/05/07 0.024 +/- 0.061 Ag-il0m 04/30/07 -0.008 +/- 0.040 10/25/07 -0.025 +/- 0.034 Cs-137 04/30/07 -0.005 + 0.025 10/25/07 0.022 +/- 0.037 Ru-103 04/30/07 0.010 +/- 0.032 10/25/07 -0.022 +/- 0.034 0.090 +/- 0.230 0.050 + 0.380 Be-7 0.170 +/- 0.270

-0.230 +/- 0.240 Fe-59 0.000 +/- 0.080

-0.032 + 0.083 Ru-106 0.060 +/- 0.220 0.190 +/- 0.310 Be-7 0.190 +/- 0.350 0.370 +/- 0.420 Fe-59

-0.082 + 0.091

-0.010 +/- 0.120 Ru-106

-0.010 +/- 0.250 0.400 +/- 0.470 Be-7

-0.240 +/- 0.260 0.070 +/- 0.290 Fe-59

-0.008 +/- 0.082 0.030 +/- 0.100 Ru-106 0.090 + 0.250

-0.230 +/- 0.260 0.004 +/- 0.066 0.080 +/- 0.110 Co-58

-0.021 +/- 0.030 0.010 +/- 0.031 1-131 0.020 +/- 0.080

-0.001 +/- 0.083 Sb-125 0.005 +/- 0.068

-0.030 +/- 0.110 Co-58

-0.040 +/- 0.036 0.014 +/- 0.062 1-131

-0.100 +/- 0.700

-0.120 +/- 0.110 Sb-125

-0.057 +/- 0.077

-0.070 + 0.140 Co-58

-0.025 +/- 0.038

-0.013 +/- 0.047 1-131

-0.036 +/- 0.096 0.040 +/- 0.100 Sb-125 0.005 +/- 0.073 0.018 +/- 0.097 0.480 +/- 0.110 0.260 +/- 0.220 Co-60 0.000 +/- 0.035 0.018 +/- 0.051 K-40 15.600 +/- 1.600 17.500 +/- 2.100 Th-228 0.160 +/- 0.130 0.150 +/- 0.160 Co-60 0.022 +/- 0.023

-0.008 +/- 0.068 K-40 15.400 +/- 1.000 12.800 +/- 2.100 Th-228 0.910 +/- 0.120 1.100 +/- 0.280 Co-60 0.004 +/- 0.036

-0.002 +/- 0.029 K-40 14.500 +/- 1.500 15.200 +/- 2.100 Th-228 0.270 +/- 0.140 0.120 +/- 0.170

-0.030 +/- 0.110

-0.130 +/- 0.150 Cr-51

-0.070 +/- 0.250 0.030 +/- 0.280 Mn-54 0.029 +/- 0.028

-0.042 +/- 0.042 Zn-65

-0.074 +/- 0.082

-0.040 +/- 0.110 Cr-51

-0.140 +/- 0.580

-0.210 +/- 0.470 Mn-54 0.000 +/- 0.025

-0.003 +/- 0.052 Zn-65

-0.060 +/- 0.110

-0.180 +/- 0.170 Cr-51 0.070 +/- 0.300

-0.270 +/- 0.290 Mn-54

-0.014 +/- 0.035 0.026 +/- 0.051 Zn-65

-0.007 +/- 0.085 0.010 +/- 0.120 0.003 +/- 0.051

-0.010 +/- 0.061 Cs-134 0.020 +/- 0.034

-0.009 +/- 0.031 Nb-95 0.052 +/- 0.037

-0.051 +/- 0.052 Zr-95

-0.021 +/- 0.047 0.010 +/- 0.053 Cs-134 0.003 +/- 0.065

-0.026 +/- 0.044 Nb-95 0.003 +/- 0.056

-0.033 +/- 0.083 Zr-95 0.012 +/- 0.069

-0.069 +/- 0.099 Cs-134

-0.002 +/- 0.037

-0.007 +/- 0.033 Nb-95

-0.017 +/- 0.043

-0.004 +/- 0.058 Zr-95

-0.042 +/- 0.051 0.050 +/- 0.067 37-C 39-X

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Page 3 of 3 Table 15, Bottom Sediment (pCi/g)

Location Collection Isotope Date 39-X 67-X Ag-ll0m 04/30/07 -0.057 +/- 0.050 11/07/07 -0.063 +/- 0.047 Cs-137 04/30/07 0.073 +/- 0.061 11/07/07 0.081 +/- 0.064 Ru-103 04/30/07 -0.028 +/- 0.048 11/07/07 -0.005 +/- 0.048 Ag-ll0m 04/30/07 0.005 +/- 0.048 10/25/07 0.030 +/- 0.100 Cs-137 04/30/07 0.165 +/- 0.061 10/25/07 0.084 +/- 0.099 Ru-103 04/30/07 0.006 +/- 0.033 10/25/07 -0.012 +/- 0.058 Ag-llrn 04/30/07 0.007 +/- 0.039 10/25/07 0.007 +/- 0.049 Cs-137 04/30/07 0.002 +/- 0.028 10/25/07 -0.035 +/- 0.062 Ru-103 04/30/07 -0.012 +/- 0.030 10/25/07 0.042 +/- 0.049 Be-7 Co-58 Co-60 Cr-51 0.110 0.360 0.310 +/-0.480 Fe-59

-0.010 +/- 0.092

-0.030 +/- 0.120 Ru-106 0.130 +/- 0.360 0.270 + 0.410 Be-7 0.200 +/- 0.380 0.150 +/- 0.560 Fe-59

-0.008 +/- 0.097 0.060 +/- 0.120 Ru-106 0.070 +/- 0.310 0.010 +/- 0.510 Be-7

-0.070 +/- 0.270 0.370 +/- 0.340 Fe-59

-0.035 +/- 0.080 0.060 +/- 0.120 Ru-106 0.000 +/- 0.220 0.140 +/- 0.390 0.006 +/- 0.044 0.010 +/- 0.051 1-131 0.020 +/- 0.140 0.027 +/- 0.092 Sb-125 0.020 +/- 0.110

-0.020 +/- 0.130 Co-58 0.008 +/- 0.036 0.015 +/- 0.053 1-131

-0.015 +/- 0.086 0.100 +/- 0.180 Sb-125 0.030 +/- 0.088 0.030 +/- 0.130 Co-58

-0.002 +/- 0.029

-0.001 +/- 0.042 1-131

-0.018 +/- 0.094

-0.040 +/- 0.130 Sb-125

-0.052 +/- 0.062 0.080 +/- 0.130 0.038 +/- 0.042 0.077 +/- 0.055 K-40 15.800 +/- 1.500 20.300 +/- 2.300 Th-228 0.760 +/- 0.190 0.760 +/- 0.280 Co-60

-0.007 +/- 0.028 0.001 +/- 0.048 K-40 16.700 +/- 1.800 17.000 +/- 2.100 Th-228 0.400 +/- 0.150 1.560 +/- 0.260 Co-60

-0.023 +/- 0.032

-0.013 +/- 0.051 K-40 15.900 +/- 1.500 13.200 +/- 2.100 Th-228 0.180 +/- 0.140

-0.070 +/- 0.190

-0.370 +/- 0.480 0.150 +/-0.510 Mn-54 0.024 +/- 0.038 0.024 +/- 0.056 Zn-65

-0.090 +/- 0.100

-0.230 +/- 0.160 Cr-51

-0.010 +/- 0.320

-0.950 +/- 0.610 Mn-54 0.003 +/- 0.035 0.026 +/- 0.051 Zn-65

-0.010 +/- 0.100

-0.070 +/- 0.130 Cr-51

-0.130 +/- 0.270 0.260 +/- 0.470 Mn-54 0.006 +/- 0.026 0.009 +/- 0.035 Zn-65

-0.038 +/- 0.080

-0.060 +/- 0.120 0.019 +/- 0.052

-0.044 +/- 0.056 Nb-95 0.025 +/- 0.060

-0.026 +/- 0.057 Zr-95

-0.052 +/- 0.063

-0.058 +/- 0.078 Cs-134 0.014 +/- 0.047 0.009 +/- 0.082 Nb-95

-0.008 +/- 0.050 0.023 +/- 0.073 Zr-95 0.022 +/- 0.055 0.060 +/- 0.100 Cs-134 0.006 +/- 0.027 0.036 +/- 0.040 Nb-95

-0.008 +/- 0.038

-0.005 +/- 0.054 Zr-95 0.024 +/- 0.049

-0.035 +/- 0.059 Cs-134 69-X

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 16, Aquatic Flora - Fucus (pCi/g)

Page 1 of 3 Location Collection Date Isotope 29 Ag-il01m Be-7 Co-58 Co-60 Cr-51 Cs-134 32-X 02/22/07 0.005 + 0.009 05/09/07 0.006 +/- 0.015 08/01/07 -0.004 + 0.012 11/05/07 -0.007 +/- 0.011 Cs-137 02/22/07 0.002 +/-0.007 05/09/07 0.003 +/-0.010 08/01/07 -0.005 +/- 0.008 11/05/07 -0.001 +/- 0.009 Ru-103 02/22/07 0.002 + 0.006 05/09/07 -0.008 +/- 0.011 08/01/07 -0.003 +/- 0.008 11/05/07 0.003 +/- 0.008 Ag-i10m 02/22/07 -0.009 +/- 0.012 05/09/07 0.007 + 0.026 08/01/07 0.006 +/- 0.015 11/05/07 -0.007 +/- 0.019 Cs-137 02/22/07 -0.001 +/- 0.009 05/09/07 0.009 +/- 0.018 08/01/07 0.002 +/- 0.009 11/05/07 -0.002 +/- 0.017 Ru-103 02/22/07 0.003 +/- 0.008 05/09/07 -0.002 +/- 0.018 08/01/07 -0.002 +/- 0.008 11/05/07 -0.010 +/- 0.017 Ag-lr0m 02/27/07 0.008 +/- 0.013 05/09/07 0.004 + 0.015 08/02/07 0.005 +/- 0.014 10/25/07 -0.004 +/- 0.015 Cs-137 02/27/07 -0.001 + 0.011 05/09/07 0.000 +/- 0.010 08/02/07 0.001 +/- 0.009 10/25/07 0.003 + 0.010 0.085 +/- 0.063 0.080 +/- 0.110 0.112 +/- 0.081 0.082 +/- 0.081 Fe-59

-0.010 +/- 0.016 0.004 +/- 0.033 0.022 +/- 0.025 0.010 +/- 0.026 Ru-106 0.027 +/- 0.061 0.040 +/- 0.100

-0.031 +/- 0.070

-0.007 +/- 0.075 Be-7 0.029 +/- 0.073 0.240 +/- 0.160 0.060 +/- 0.071 0.100 + 0.120 Fe-59

-0.011 +/- 0.021 0.007 +/- 0.042 0.016 +/- 0.029

-0.025 +/- 0.039 Ru-106

-0.024 +/- 0.061 0.000 +/- 0.150

-0.091 + 0.086 0.020 +/- 0.130 Be-7 0.078 +/- 0.086 0.150 +/- 0.110 0.093 +/- 0.094 0.150 +/- 0.110 Fe-59

-0.005 +/- 0.031 0.036 +/- 0.033

-0.006 +/- 0.026

-0.014 +/- 0.037

-0.002 +/- 0.007

-0.008 +/- 0.014 0.004 +/- 0.008

-0.008 + 0.010 1-131 0.005 +/- 0.016 0.009 +/- 0.048

-0.002 +/- 0.021

-0.002 +/- 0.021 Sb-125

-0.011 +/- 0.016

-0.005 +/- 0.026 0.005 +/- 0.020

-0.011 +/- 0.023 Co-58 0.009 +/- 0.009

-0.008 +/- 0.016 0.004 +/- 0.009 0.011 +/- 0.017 1-131 0.002 +/- 0.019 0.000 +/- 0.080 0.016 +/- 0.023 0.005 +/- 0.028 Sb-125 0.013 +/- 0.019 0.030 + 0.042 0.002 +/- 0.020

-0.031 +/- 0.039 Co-58 0.001 +/- 0.010

-0.001 + 0.012 0.000 + 0.010 0.001 +/- 0.012 1-131 0.006 + 0.015 0.029 +/- 0.053

-0.002 + 0.019

-0.016 +/- 0.034

-0.003 +/- 0.008 0.005 +/- 0.012 0.000 +/- 0.009

-0.004 + 0.010 K-40 5.440 +/- 0.360 3.770 +/- 0.530 5.360 +/- 0.450 6.340 +/- 0.540 Th-228 0.056 + 0.025 0.056 + 0.044 0.043 +/- 0.041 0.072 +/- 0.032 Co-60 0.004 +/- 0.007

-0.009 + 0.021

-0.004 +/- 0.011

-0.011 +/- 0.018 K-40 5.270 +/- 0.440 6.270 +/- 0.950 4.970 +/- 0.530 7.430 +/- 0.720 Th-228 0.048 + 0.041

-0.023 +/- 0.095 0.019 +/- 0.044 0.007 + 0.068 Co-60

-0.006 +/- 0.013

-0.008 + 0.014 0.001 +/- 0.012

-0.014 + 0.013 K-40 5.350 +/- 0.590 3.970 +/- 0.580 4.220 +/- 0.540 6.100 +/- 0.670 0.025 +/- 0.062 0.000 + 0.097

-0.026 +/- 0.079 0.041 +/- 0.090 Mn-54 0.002 +/- 0.007 0.005 +/- 0.011

-0.001 + 0.008 0.006 + 0.011 Zn-65 0.025 +/- 0.032 0.010 +/- 0.029

-0.042 + 0.028 0.003 +/- 0.026 Cr-51 0.007 +/- 0.072 0.200 +/- 0.180

-0.012 +/- 0.080 0.100 + 0.130 Mn-54

-0.001 +/- 0.008 0.004 +/- 0.016

-0.011 +/- 0.009 0.009 +/- 0.016 Zn-65

-0.005 + 0.021

-0.049 + 0.057

-0.001 + 0.033

-0.003 +/- 0.043 Cr-51 0.012 +/- 0.084 0.070 +/- 0.120 0.000 +/- 0.094 0.128 +/- 0.091 Mn-54

-0.002 +/- 0.010 0.007 +/- 0.012

-0.003 + 0.011

-0.005 +/- 0.013 0.002 + 0.007 0.003 + 0.011 0.007 +/- 0.009 0.012+/-0.011 Nb-95 0.001 + 0.007 0.011 +/- 0.015 0.004 +/- 0.011

-0.004 + 0.010 Zr-95 0.005 +/- 0.013

-0.010 +/- 0.016 0.000 +/- 0.014

-0.006 +/- 0.017 Cs-134 0.002 +/- 0.009 0.006 +/- 0.022 0.007 +/- 0.009 0.004 +/- 0.015 Nb-95 0.010 + 0.010

-0.003 +/- 0.022 0.003 +/- 0.011 0.018 +/- 0.017 Zr-95

-0.002 +/- 0.014 0.009 +/- 0.036 0.007 +/- 0.017 0.010 +/- 0.027 Cs-134

-0.002 +/- 0.011 0.008 +/- 0.014 0.002 + 0.012 0.007 + 0.014 Nb-95 0.011 +/- 0.013

-0.009 +/- 0.012

-0.007 +/- 0.013 0.010 + 0.014 33-X

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 16, Aquatic Flora - Fucus (pCi/g)

Page 2 of 3 Location Collection Date Isotope 33-X Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 35-X 02/27/07 -0.005 + 0.009 05/09/07 -0.008 + 0.014 08/02/07 -0.002 +/- 0.012 10/25/07 0.006 + 0.011 Ag-il0m 02/27/07 -0.008 +/- 0.012 05/09/07 -0.002 +/- 0.023 08/01/07 -0.007 +/- 0.018 11/05/07 -0.009 + 0.010 Cs-137 02/27/07 0.007 +/- 0.011 05/09/07 0.002 + 0.014 08/01/07 0.007 + 0.014 11/05/07 0.001 +/- 0.008 Ru-103 02/27/07 0.002 + 0.009 05/09/07 -0.006 +/- 0.018 08/01/07 -0.006 +/- 0.016 11/05/07 0.000 +/- 0.007 Ag-il0m 02/22/07 0.000 +/- 0.010 05/09/07 -0.001 +/- 0.014 08/01/07 0.001 +/- 0.016 11/19/07 0.005 +/- 0.024 Cs-137 02/22/07 0.000 +/- 0.007 05/09/07 0.003 +/- 0.010 08/01/07 0.008 +/- 0.010 11/19/07 -0.006 +/- 0.022 Ru-103 02/22/07 0.003 +/- 0.008 05/09/07 0.001 +/- 0.008 08/01/07 0.001 +/- 0.007 11/19/07 0.006 +/- 0.018 Ag-il0m 02/22/07 0.008 +/- 0.011 05/09/07 -0.006 +/- 0.013 08/02/07 -0.001 +/- 0.011 10/25/07 -0.002 +/- 0.018 0.009 +/- 0.096 0.044 +/- 0.097

-0.051 +/- 0.077

-0.074 +/- 0.087 Be-7 0.220 +/- 0.110 0.140 +/- 0.140 0.090 +/- 0.120 0.021 +/- 0.059 Fe-59 0.003 +/- 0.033

-0.030 +/- 0.053

-0.018 +/- 0.047

-0.011 +/- 0.022 Ru-106

-0.009 +/- 0.096 0.020 +/- 0.110 0.170 +/- 0.120

-0.035 +/- 0.057 Be-7 0.073 +/- 0.064 0.180+/-0.110 0.083 +/- 0.080 0.090 +/- 0.110 Fe-59 0.029 +/- 0.026 0.001 +/- 0.028

-0.003 +/- 0.029

-0.019 +/- 0.071 Ru-106

-0.005 +/- 0.061 0.021 +/- 0.092

-0.024 +/- 0.071

-0.080 +/- 0.210 Be-7 0.096 +/- 0.072 0.360 +/- 0.150 0.068 +/- 0.065 0.100 +/- 0.110 0.011 +/- 0.026 0.005 +/- 0.021

-0.009 +/- 0.023

-0.015 +/- 0.024 Co-58 0.004 +/- 0.010 0.006 +/- 0.015 0.002 +/- 0.016

-0.002 +/- 0.008 1-131 0.017+/-0.016 0.032 +/- 0.051 0.020 +/- 0.038 0.015 +/- 0.014 Sb-125 0.002 +/- 0.025

-0.011 +/- 0.034

-0.006 +/- 0.027

-0.004 +/- 0.018 Co-58

-0.005 +/- 0.008 0.001 +/- 0.011

-0.002 +/- 0.011 0.019 +/- 0.023 1-131 0.010+/-0.015 0.049 +/- 0.045 0.015 +/- 0.022

-0.010 +/- 0.100 Sb-125

-0.006 +/- 0.018 0.003 +/- 0.023

-0.002 +/- 0.022

-0.028 +/- 0.034 Co-58

-0.001 +/- 0.009

-0.003 +/- 0.010

-0.007 +/- 0.007

-0.004 +/- 0.012 0.037 +/- 0.045 0.044 +/- 0.047 0.041 +/- 0.049 0.050 +/- 0.034 Co-60

-0.011 +/- 0.015

-0.002 +/- 0.020 0.012 +/- 0.022 0.003 +/- 0.008 K-40 4.830 +/- 0.600 6.410 +/- 0.910 4.740 +/- 0.830 7.310 +/- 0.420 Th-228 0.014 +/- 0.050 0.041 +/- 0.071 0.009 +/- 0.070 0.074 +/- 0.033 Co-60

-0.003 +/- 0.009 0.000 +/- 0.012

-0.005 +/- 0.012

-0.011 +/- 0.024 K-40 4.520 +/- 0.430 4.990 +/- 0.490 5.040 +/- 0.590 5.800 +/- 1.000 Th-228 0.065 +/- 0.032 0.032 +/- 0.039 0.024 +/- 0.044 0.092 +/- 0.094 Co-60 0.003 +/- 0.010 0.005 +/- 0.011 0.005 +/- 0.009

-0.008 +/- 0.016

-0.032 +/- 0.025 0.000 +/- 0.026

-0.018 +/- 0.034

-0.006 +/- 0.035 Cr-51 0.017 +/- 0.074 0.050 +/- 0.110

-0.050 +/- 0.140

-0.023 +/- 0.065 Mn-54

-0.004 +/- 0.013 0.019 +/- 0.017 0.007 +/- 0.019 0.001 +/- 0.008 Zn-65

-0.027 +/- 0.035

-0.058 +/- 0.041 0.006 +/- 0.042

-0.027 +/- 0.023 Cr-51 0.009 +/- 0.053 0.060 +/- 0.110 0.057 +/- 0.078 0.000 +/- 0.180 Mn-54

-0.001 +/- 0.008

-0.001 +/- 0.009 0.003 +/- 0.010

-0.001 +/- 0.019 Zn-65

-0.007 +/- 0.018

-0.015 +/- 0.027 0.022 +/- 0.033 0.008 +/- 0.057 Cr-51 0.020 +/- 0.590

-0.060 +/- 0.120 0.014 +/- 0.070 0.030 +/- 0.110 0.011 +/- 0.021 0.016 +/- 0.023 0.006 +/- 0.015

-0.003 +/- 0.026 Cs-134 0.004 +/- 0.011

-0.005 +/- 0.020 0.011 +/- 0.016 0.006 +/- 0.008 Nb-95 0.015 +/- 0.013 0.007 +/- 0.024

-0.006 +/- 0.012 0.005 +/- 0.009 Zr-95

-0.001 +/- 0.020 0.016 +/- 0.032 0.008 +/- 0.032

-0.005 +/- 0.013 Cs-134 0.000 +/- 0.009 0.006 +/- 0.010

-0.002 +/- 0.010

-0.006 +/- 0.026 Nb-95

-0.003 +/- 0.009

-0.009 +/- 0.011 0.002 +/- 0.012

-0.002 +/- 0.024 Zr-95 0.007 +/- 0.014

-0.019 +/- 0.018 0.026 +/- 0.019 0.041 +/- 0.043 Cs-134 0.002 +/- 0.008

-0.004 +/- 0.011 0.007 +/- 0.007 0.010 +/-0.016 36-X 90-C

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 16, Aquatic Flora - Fucus (pCi/g)

Page 3 of 3 Location Collection Isotope Date 90-C Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 02/22/07 0.000 + 0.009 0.019 +/- 0.022 0.046 +/- 0.026 4.410 +/- 0.430

-0.006 +/- 0.007 0.004 + 0.009 05/09/07 0.001 +/- 0.009

-0.007 +/- 0.030 0.027 +/- 0.048 4.220 + 0.490

-0.003 +/- 0.009

-0.004 +/- 0.013 08/02/07 0.010 +/- 0.009

-0.006 +/- 0.022

-0.007 + 0.019 4.520 + 0.400 0.006 +/- 0.008 0.003 -L 0.009 10/25/07 0.002 +/- 0.012 0.004 + 0.046 0.000 + 0.056 6.650 + 0.730 0.002 +/- 0.013

-0.007 +/- 0.016 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/22/07 0.003 +/- 0.008

-0.013 +/- 0.083 0.002 +/- 0.019 0.058 +/- 0.049

-0.030 +/- 0.026 0.002 +/- 0.015 05/09/07 0.002 +/- 0.011

-0.056 +/- 0.073 0.003 +/- 0.024 0.039 +/- 0.043 0.005 +/- 0.026 0.004 +/- 0.020 08/02/07 -0.001 +/- 0.007 0.034 +/- 0.062

-0.018 +/- 0.017 0.014 +/- 0.031

-0.006 +/- 0.023 0.007 +/- 0.013 10/25/07 -0.009 +/- 0.014

-0.090 +/- 0.110 0.017 +/- 0.021 0.071 +/- 0.061 0.010 +/- 0.032 0.015 +/- 0.024

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 17-A, Fish - Flounder (pCi/g)

Page 1 of 1 Location Collection Date Isotope 32 Ag-il0m 01/30/07 J

04/30/07 -0.013 +/- 0.044 07/24/07 0.004 +/- 0.036 10/02/07 0.005 +/- 0.026 11/13/07 -0.015 +/- 0.048 Cs-137 04/30/07 0.003 +/- 0.022 07/24/07 0.025 +/- 0.025 10/02/07 -0.019 +/- 0.020 11/13/07 -0.008 +/- 0.037 Ru-103 04/30/07 -0.003 +/- 0.032 07/24/07 0.033 +/- 0.029 10/02/07 0.037 +/- 0.030 11/13/07 -0.004 +/- 0.034 Ag-1lOm 02/05/07 0.001 +/- 0.019 04/30/07 0.000 +/- 0.042 07/24/07 0.006 + 0.023 11/13/07 0.017 +/- 0.032 Cs-137 Be-7 Co-58 Co-60 Cr-51 Cs-134

-0.070 +/- 0.210

-0.020 +/- 0.170 0.080 +/- 0.150 0.000 +/- 0.330 Fe-59 0.010 +/- 0.050

-0.025 + 0.069

-0.046 +/- 0.062

-0.028 +/- 0.080 Ru-106

-0.090 +/- 0.190

-0.160 +/- 0.200 0.080 + 0.250 0.020 +/- 0.340 Be-7 0.112 +/- 0.096

-0.050 +/- 0.180 0.040 + 0.140 0.080 +/- 0.200 Fe-59

-0.004 +/- 0.028

-0.100 +/- 0.075 0.037 +/- 0.038 0.000 +/- 0.055 Ru-106 0.070 +/- 0.120 0.070 + 0.190

-0.020 +/- 0.170 0.130 +/- 0.220

-0.010 +/- 0.037 0.010 +/- 0.026 0.007 +/- 0.021 0.002 +/- 0.034 1-131

-0.004 +/- 0.049

-0.007 +/- 0.067 0.074 +/- 0.076

-0.023 +/- 0.091 Sb-125

-0.007 + 0.052

-0.024 +/- 0.055

-0.049 + 0.064 0.040 +/- 0.085 Co-58 0.004 +/- 0.013 0.011 + 0.029 0.011 +/-0.019 0.010 +/- 0.025 1-131

-0.012 +/- 0.029

-0.012 +/- 0.059 0.000 +/- 0.051

-0.024 +/- 0.077 Sb-125

-0.010 +/- 0.029 0.050 +/- 0.079 0.018 +/- 0.039 0.005 +/- 0.058

-0.007 +/- 0.026 0.020 +/- 0.033 0.014 +/- 0.028

-0.023 +/- 0.037 K-40 3.810 +/- 0.970 3.260 +/- 0.790 3.560 +/- 0.860 4.250 +/- 0.810 Th-228 0.070 +/- 0.100 0.003 +/- 0.078

-0.020 + 0.110

-0.050 +/- 0.120 Co-60

-0.006 +/- 0.014 0.028 +/- 0.030 0.000 + 0.018 0.012 +/- 0.023 K-40 3.490 +/- 0.410 3.510 +/- 0.980 3.670 +/- 0.560 3.480 +/- 0.820 Th-228 0.016 +/- 0.047

-0.140 + 0.130

-0.008 + 0.057 0.001 +/- 0.077 0.060 + 0.190

-0.020 + 0.260 0.070 + 0.310

-0.090 + 0.330 Mn-54

-0.011 +/- 0.025 0.023 +/- 0.024

-0.003 +/- 0.030

-0.004 +/- 0.035 Zn-65

-0.028 +/- 0.056

-0.007 +/- 0.060

-0.008 +/- 0.072

-0.025 +/- 0.073 Cr-51 0.020 +/- 0.120

-0.040 + 0.240 0.010 +/- 0.180 0.050 +/- 0.230 Mn-54

-0.011 +/- 0.012

-0.021 +/- 0.027

-0.003 +/- 0.018

-0.013 +/- 0.022 Zn-65

-0.048 +/- 0.035

-0.010 +/- 0.071 0.045 +/- 0.050

-0.081 +/- 0.074

-0.013 +/- 0.033 0.026 +/- 0.024

-0.019 + 0.020

-0.017 + 0.036 Nb-95

-0.017 +/- 0.030 0.017 +/- 0.032

-0.012 +/- 0.035 0.007 + 0.042 Zr-95 0.008 +/- 0.049 0.039 +/- 0.048

-0.006 +/- 0.039

-0.012 +/- 0.063 Cs-134

-0.006 +/- 0.014

-0.009 +/- 0.026

-0.001 +/- 0.019

-0.020 +/- 0.025 Nb-95

-0.002 +/- 0.016

-0.027 +/- 0.033 0.003 +/- 0.021 0.024 +/- 0.031 Zr-95 0.022 +/- 0.023

-0.037 +/- 0.059

-0.005 +/- 0.032 0.010 +/- 0.040 35 02/05/07 04/30/07 07/24/07 11/13/07 02/05/07 04/30/07 07/24/07 11/13/07 0.007 +/- 0.012

-0.005 +/- 0.033

-0.003 +/- 0.017 0.000 +/- 0.022 Ru-103 0.003 +/- 0.014

-0.019 +/- 0.024 0.013 +/- 0.019 0.021 +/- 0.026

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 17-B, Fish - Other (pCi/g)

Page 1 of 2 Location Collection Date Sample Type Isotope Date 32 01/30/07 05/02/07 09/07/07 10/09/07 05/02/07 09/07/07 10/09/07 05/02/07 09/07/07 10/09/07 05/02/07 09/07/07 10/09/07 FISH-OTHER STRIPED BASS BLUEFISH TAUTOG STRIPED BASS BLUEFISH TAUTOG STRIPED BASS BLUEFISH TAUTOG STRIPED BASS BLUEFISH TAUTOG 35 01/23/07 06/08/07 08/06/07 10/02/07 01/23/07 06/08/07 08/06/07 10/02/07 01/23/07 06/08/07 08/06/07 10/02/07 01/23/07 06/08/07 08/06/07 10/02/07 MACKEREL TAUTOG TAUTOG TAUTOG MACKEREL TAUTOG TAUTOG TAUTOG MACKEREL TAUTOG TAUTOG TAUTOG MACKEREL TAUTOG TAUTOG TAUTOG Ag-ll0m J

-0.006 +/- 0.048 0.012 +/- 0.025

-0.004 +/- 0.038 Cs-134 0.026 +/- 0.035 0.018 +/- 0.021 0.000 +/- 0.026 Mn-54 0.016 +/- 0.028

-0.007 +/- 0.0 18 0.018 +/- 0.030 Th-228

-0.080 +/- 0.120 0.016 +/- 0.073

-0.092 +/- 0.093 Ag-il0m 0.004 +/-- 0.017

-0.015 +/- 0.042

-0.006 +/- 0.020 0.000 +/- 0.048 Cs-134

-0.005 +/- 0.015

-0.038 + 0.038 0.000 +/- 0.015 0.003 - 0.034 Mn-54 0.008 +/- 0.014 0.032 +/-- 0.029

-0.002 +/-- 0.014

-0.003 +/- 0.029 Th-228

-0.037 +/-z 0.053 0.070 +/-- 0.110 0.011 +/- 0.052

-0.050 +/-- 0.150 Ag-ll0m

-0.011 1- 0.019

-0.022 +/-- 0.048 K

0.006 Az 0.055 Cs-134 0.006 Az 0.015

-0.012 A 0.034 Be-7

-0.030 Az 0.260

-0.060 A 0.170 0.080 Az 0.200 Cs-137

-0.016 4A 0.028

-0.012 Az 0.020 0.007 Az 0.027 Nb-95 0.008 +/- 0.034

-0.007 +/- 0.019 0.009 +/- 0.026 Zn-65

-0.030 Az 0.060 0.022 Az 0.047

-0.008 Az 0.068 Be-7 0.010 Az 0.120

-0.100 Az 0.210

-0.020 Az 0.120

-0.080 +/- 0.250 Cs-137 0.000 Az 0.014 0.004 Az 0.032

-0.002 4A 0.012

-0.001 Az 0.045 Nb-95

-0.006 Az 0.017 0.020 Az 0.033

-0.002 Az 0.014

-0.046 A 0.047 Zn-65

-0.046 Az 0.034

-0.037 Az 0.065

-0.028 Az 0.033

-0.015 +/- 0.090 Be-7 0.023 Az 0.099 0.160 +/- 0.250

-0.160 Az 0.260 Cs-137 0.003 Az 0.014

-0.003 Az 0.029 Co-58

-0.002 Az 0.024

-0.012 + 0.019 0.000 Az 0.027 Fe-59 0.000 Az 0.069

-0.019 A 0.044 0.030 Az 0.059 Ru-103 0.003 +/- 0.033 0.011 A 0.018 0.000 +/- 0.020 Zr-95 0.000 Az 0.053

-0.009 Az 0.035 0.000 Az 0.041 Co-58

-0.003 Az 0.015 0.024 Az 0.032

-0.005 A 0.014 0.021 +/- 0.033 Fe-59

-0.023 Az 0.036 0.013 Az 0.085 0.000 Az 0.032 0.048 A 0.095 Ru-103

-0.010 +/- 0.014 0.004 Az 0.032 0.002 A 0.016

-0.021 A 0.033 Zr-95 0.007 Az 0.028 0.019 Az 0.068 0.022 Az 0.023

-0.042 Az 0.072 Co-58

-0.002 Az 0.012 0.012 Az 0.028

-0.003 +/- 0.035 Fe-59 0.002 +/-- 0.028

-0.012 +/- 0.066 Co-60 0.001 +/- 0.012

-0.002 Az 0.030

-0.016 +/- 0.015 0.034 Az 0.034 1-131

-0.019 Az 0.042

-0.004 Az 0.061

-0.018 Az 0.025 0.057 Az 0.095 Ru-106

-0.050 A 0.140

-0.190 Az 0.270 0.000 Az 0.130 0.380 Az 0.390 Cr-51

-0.030 A- 0.150

-0.010 Az 0.210

-0.180 Az 0.140 0.110 0.340 K-40 4.110 +- 0.490 4.500 Az 1.200 3.420 Az 0.490 2.700 +/- 1.100 Sb-125 0.005 Az 0.035 0.000 Az 0.074 0.022 A 0.035

-0.054 A 0.072 Co-60 0.021 Az 0.038

-0.014 Az 0.018 0.000 +/-- 0.021 1-131

-0.011 +/- 0.054 0.019 Az 0.040 0.019 Az 0.043 Ru-106

-0.100 Az 0.250 0.000 Az 0.190

-0.080 Az 0.190 Cr-51

-0.210 +/-- 0.270 0.060 Az 0.170

-0.150 Az 0.190 K-40 2.780 Az 0.930 3.210 Az 0.600 4.440 Az 0.950 Sb-125 0.008 Az 0.076 0.027 +/- 0.048 0.000 Az 0.054 40-X 02/28/07 06/13/07 07/01/07 12/12/07 STRIPED BASS STRIPED BASS FISH-OTHER STRIPED BASS Co-60 0.000 Az 0.015

-0.020 Az 0.050

-0.012 Az 0.036 1-131 0.008 +/- 0.023

-0.012 Az 0.044 Cr-51 0.050 4A 0.120 0.050 Az 0.320

-0.110 + 0.250 K-40 3.590 Az 0.430 4.300 + 1.300 02/28/07 STRIPED BASS 06/13/07 STRIPED BASS

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 17-B, Fish - Other (pCi/g)

Page 2 of 2 Location Collection Sample Type Date Isotope 40-X Cs-134 12/12/07 STRIPED BASS

-0.026 + 0.036 02/28/07 06/13/07 12/12/07 02/28/07 06/13/07 12/12/07 STRIPED BASS STRIPED BASS STRIPED BASS STRIPED BASS STRIPED BASS STRIPED BASS Mn-54

-0.002 +/- 0.011 0.002 +/- 0.023

-0.011 +/- 0.037 Th-228

-0.005 +/- 0.050

-0.080 + 0.110 0.030 + 0.130 Cs-137 0.000 +/- 0.041 Nb-95

-0.015 +/- 0.014

-0.001 +/- 0.033 0.025 +/- 0.041 Zn-65

-0.019 + 0.032

-0.040 + 0.100

-0.070 +/- 0.100 Ru-103 0.006 +/- 0.012 0.008 +/- 0.030

-0.021 +/- 0.021 Zr-95 0.003 +/- 0.022

-0.012 +/- 0.046

-0.006 +/- 0.061 Ru-106 0.010 + 0.120

-0.070 + 0.260 0.100 +/- 0.240 Fe-59 1-131 K-40

-0.016 +/- 0.073

-0.021 +/- 0.050 3.300 +/- 1.200 Sb-125 0.010 +/- 0.032

-0.103 +/- 0.077 0.012 +/- 0.070

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 18, Mussels (pCi/g)

Page 1 of I Location Collection Date Isotope 28 Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/12/07 0.001 +/- 0.020 0.050 +/- 0.110 0.001 +/- 0.015 0.004 +/- 0.013

-0.040 +/-0.130 0.005 +/- 0.016 06/05/07 0.040 +/- 0.060

-0.160 +/- 0.400 0.038 +/- 0.053

-0.006 +/- 0.047

-0.200 +/- 0.410 0.013 +/- 0.038 09/26/07 0.025 +/- 0.034

-0.050 +/- 0.210 0.008 +/- 0.024 0.005 +/- 0.032 0.020 +/- 0.250

-0.004 +/- 0.028 11/28/07 0.022 +/- 0.050 0.040 +/- 0.290

-0.002 +/- 0.029

-0.001 +/- 0.028 0.020 +/- 0.260

-0.019 +/- 0.038 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/12/07 0.001 +/- 0.013

-0.010 +/- 0.030 0.010 +/- 0.027 1.270 +/- 0.340 0.006 +/- 0.013 0.002 +/- 0.016 06/05/07 -0.005 +/- 0.039

-0.024 +/- 0.099 0.087 +/- 0.095 2.350 +/- 0.980

-0.004 +/- 0.041 0.016 +/- 0.057 09/26/07 -0.004 +/- 0.020 0.023 +/- 0.051 0.069 +/- 0.077 2.040 +/- 0.710 0.018 +/- 0.027

-0.021 +/- 0.032 11/28/07 -0.018 +/- 0.026

-0.048 +/- 0.095

-0.001 +/- 0.040 1.030 +/- 0.740

-0.001 +/- 0.019

-0.019 +/- 0.042 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/12/07 -0.009 +/- 0.014

-0.080 +/- 0.130

-0.017 +/- 0.036 0.008 +/- 0.063 0.007 +/- 0.055

-0.006 +/- 0.027 06/05/07 -0.034 +/- 0.045 0.030 +/- 0.380

-0.050 +/- 0.110

-0.250 +/- 0.180

-0.030 +/- 0.120 0.029 +/- 0.077 09/26/07 -0.015 +/- 0.029 0.170 +/- 0.260 0.043 +/- 0.067

-0.071 +/- 0.091

-0.023 +/- 0.053 0.007 +/- 0.052 11/28/07 0.000 +/- 0.029 0.000 +/- 0.200

-0.023 +/- 0.074

-0.120 +/- 0.150

-0.016 +/- 0.086

-0.017 +/- 0.055 30 Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/05/07 0.000 +/- 0.017 0.230 +/- 0.170

-0.009 +/- 0.013 0.003 +/- 0.017

-0.190 +/- 0.140

-0.008 +/- 0.015 05/30/07 0.000 +/- 0.052 0.160 +/- 0.260

-0.008 +/- 0.019

-0.018 +/- 0.043

-0.080 +/- 0.270

-0.007 +/- 0.027 09/12/07 0.017 +/- 0.028

-0.050 +/- 0.140 0.002 +/- 0.018 0.007 +/- 0.019 0.070 +/- 0.150 0.000 +/-L 0.018 11/28/07 -0.010 +/- 0.057 0.300 +/- 0.350

-0.004 +/- 0.028

-0.011 +/- 0.022

-0.180 +/- 0.250 0.005 +/- 0.043 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/05/07 0.015 +/- 0.016

-0.015 +/- 0.037 0.014 +/- 0.026 05/30/07 -0.024 +/- 0.037

-0.013 +/- 0.076 0.009 +/- 0.061 09/12/07 0.012 +/- 0.020 0.034 +/- 0.031 0.002 +/- 0.028 11/28/07 0.003 +/- 0.035 0.017 +/- 0.074 0.047 +/- 0.077 1.860 +/- 0.400

-0.020 +/- 0.017 0.003 +/- 0.020 2.290 +/- 0.910

-0.017 +/- 0.038 0.003 +/- 0.029 1.890 +/- 0.490 0.002 +/- 0.016 0.003 +/- 0.014 1.830 +/- 0.960

-0.008 +/- 0.039

-0.023 +/- 0.036 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/05/07 0.008 +/- 0.016 0.170 +/- 0.130 0.009 +/- 0.037 0.069 +/- 0.069

-0.020 +/- 0.035

-0.004 +/- 0.026 05/30/07 0.008 +/- 0.031

-0.110 +/- 0.260

-0.009 +/- 0.068

-0.090 +/- 0.110 0.012 +/- 0.064

-0.010 +/- 0.057 09/12/07 -0.005 +/- 0.015 0.070 +/- 0.160 0.033 +/- 0.053

-0.027 +/- 0.060

-0.001 +/- 0.039 0.003 +/- 0.029 11/28/07 0.016 +/- 0.024

-0.160 +/- 0.390

-0.012 +/- 0.074

-0.020 +/- 0.130

-0.034 +/- 0.067

-0.008 +/- 0.072

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 19, Oysters (pCi/g)

Page 1 of3 Location Collection Isotope Date 31 Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/20/07

-0.007 +/- 0.023

-0.080 +/- 0.150 0.000 +/- 0.017

-0.007 +/- 0.016

-0.020 + 0.180

-0.011 + 0.018 06/20/07 0.004 +/- 0.029 0.120 +/- 0.220

-0.003 +/- 0.022 0.000 + 0.027

-0.080 + 0.210 0.015 +/- 0.019 09/18/07 -0.034 - 0.039 0.000 + 0.240 0.009 +/- 0.036 0.011 + 0.031 0.090 + 0.220 0.021 + 0.028 12/19/07 0.014 + 0.045 0.160 + 0.270

-0.012 + 0.029 0.006 +/- 0.026

-0.290 + 0.180 0.017 +/- 0.024 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/20/07 0.008 + 0.016

-0.033 + 0.044 0.019 + 0.048 1.540 +/- 0.460 0.000 + 0.018 0.008 + 0.024 06/20/07 -0.006 + 0.022 0.023 + 0.054

-0.006 + 0.075 1.620 + 0.620 0.000 + 0.025 0.002 + 0.032 09/18/07 -0.004 + 0.025

-0.011 + 0.063 0.022 + 0.040 2.030 + 0.830

-0.016 + 0.024

-0.013 + 0.028 12/19/07 -0.017,+ 0.023 0.039 + 0.069 0.000 + 0.055 1.450 + 0.800 0.017 + 0.028 0.003 + 0.030 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/20/07 -0.001 +/- 0.020 0.050 + 0.180

-0.017 + 0.042

-0.011 +/- 0.067

-0.032 + 0.044 0.021 + 0.032 06/20/07 -0.024 + 0.026

-0.070 + 0.230 0.021 + 0.059

-0.034 + 0.084 0.021 + 0.054

-0.005 + 0.056 09/18/07 0.020 +/- 0.031 0.000 + 0.250 0.053 +/- 0.066

-0.031 - 0.093 0.010 +/- 0.047

-0.007 +/- 0.055 12/19/07 0.004 +/- 0.033 0.170 +/- 0.270 0.018 +/- 0.064

-0.020 +/- 0.150

-0.088 + 0.076 0.020 - 0.042 32 Ag-i 10m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/16/07 0.046 + 0.032 0.000 - 0.190

-0.004 +/- 0.023 0.012 +/- 0.022 0.240 + 0.270

-0.002 + 0.021 06/20/07 0.009 + 0.052 0.080 + 0.220 0.006 + 0.024 0.003 +/- 0.015 0.150 + 0.250

-0.003 + 0.023 09/19/07 0.027 +/- 0.062 0.260 +/- 0.390

-0.039 +/- 0.045 0.016 + 0.057

-0.090 +/- 0.370

-0.004 + 0.044 12/18/07 -0.009 + 0.035

-0.160 + 0.210

-0.020 +/- 0.023 0.004 + 0.028

-0.190 + 0.220 0.000 +/- 0.023 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/16/07 -0.037 + 0.027 0.027 +/- 0.042

-0.019 +/- 0.095 2.200 + 0.620 0.007 +/- 0.026 0.014 +/- 0.032 06/20/07 -0.019 +/- 0.021

-0.013 +/- 0.055 0.046 +/- 0.082 2.510 + 0.620 0.015 +/- 0.022 0.009 +/- 0.031 09/19/07 0.046 +/- 0.055

-0.050 +/- 0.100

-0.026 +/- 0.085 1.610 + 0.890

-0.033 + 0.045 0.048 + 0.048 12/18/07 0.006 + 0.024 0.004 +/- 0.050 0.036 +/- 0.074 1.670 + 0.670

-0.009 + 0.022

-0.022 + 0.035 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/16/07 -0.009 + 0.025 0.090 + 0.240 0.005 + 0.054 0.041 + 0.098

-0.043 + 0.053 0.008 + 0.032 06/20/07 -0.005 + 0.023 0.120 + 0.140 0.011 + 0.056 0.061 + 0.086

-0.052 + 0.053 0.005 + 0.048 09/19/07 0.003 + 0.042

-0.380 + 0.420

-0.020 + 0.110 0.030 + 0.170 0.075 +/- 0.093 0.000 + 0.082 12/18/07 -0.004 + 0.026 0.100 + 0.220

-0.006 + 0.067

-0.077 +/- 0.094 0.007 + 0.067 0.006 + 0.044 34-X Ag-ih0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/20/07 -0.015 + 0.028

-0.040 + 0.180

-0.003 + 0.022

-0.020 + 0.032

-0.030 + 0.180 0.000 + 0.025 04/01/07 L

09/18/07 -0.013 + 0.044

-0.030 + 0.260 0.029 + 0.028

-0.017 + 0.039

-0.050 + 0.240 0.007 - 0.024 12/19/07 0.023 + 0.037 0.200 + 0.180

-0.014 + 0.029 0.006 + 0.027 0.040 + 0.230

-0.009 + 0.032 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/20/07 -0.002 +/- 0.020 0.014 + 0.041 0.010 + 0.052 09/18/07 -0.004 +/- 0.031 0.045 - 0.063 0.048 + 0.061 12/19/07 -0.023 + 0.030

-0.026 + 0.064

-0.003 + 0.061 1.650 +/- 0.570 0.013 +/- 0.024

-0.026 +/- 0.032 2.550 +/- 0.900

-0.001 +/- 0.027

-0.006 +/- 0.028 1.900 +/- 0.880

-0.003 +/- 0.030

-0.011 +/- 0.041

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 19, Oysters (pCi/g)

Page 2 of 3 Location Collection Isotope Date 34-X Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/20/07 -0.005 +/- 0.024 0.170 +/- 0.220 0.028 +/- 0.052 0.013 +/- 0.076

-0.062 + 0.053 0.032 + 0.037 09/18/07 0.007 +/- 0.025 0.180 +/- 0.270

-0.016 +/- 0.076 0.010 +/- 0.110 0.000 +/- 0.054 0.020 +/- 0.047 12/19/07 0.004 +/- 0.025 0.000 +/- 0.220

-0.036 +/- 0.051

-0.030 + 0.013

-0.025 +/- 0.062

-0.042 +/- 0.042 36 Ag-il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/14/07 -0.005 +/- 0.023

-0.110 +/- 0.130

-0.010 +/- 0.016 0.003 +/- 0.023

-0.030 +/- 0.140 0.002 +/- 0.014 06/19/07 0.011 +/- 0.036 0.000 +/- 0.220 0.008 +/- 0.018

-0.014 +/- 0.019 0.090 +/- 0.240

-0.003 +/- 0.024 09/18/07 0.024 +/- 0.029 0.020 +/- 0.180 0.012 +/- 0.024 0.008 +/- 0.028

-0.090 +/- 0.200 0.021 +/- 0.025 12/19/07 0.008 +/- 0.030 0.200 +/- 0.180 0.006 +/- 0.028 0.003 +/- 0.025

-0.110 +/- 0.220

-0.009 +/- 0.031 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/14/07 0.004 +/- 0.017

-0.038 +/- 0.032

-0.011 +/- 0.025 1.850 +/- 0.480

-0.004 +/- 0.018 0.003 +/- 0.018 06/19/07 0.011 +/- 0.023 0.000 +/- 0.058

-0.007 +/- 0.090 2.110 +/- 0.600

-0.017 +/- 0.024

-0.020 + 0.029 09/18/07 0.009 +/- 0.024 0.041 +/- 0.058 0.008 +/- 0.049 1.930 + 0.650

-0.003 + 0.027

-0.007 + 0.024 12/19/07 -0.006 +/- 0.026

-0.032 +/- 0.050

-0.025 +/- 0.044 1.360 +/- 0.580

-0.006 +/- 0.024

-0.004 + 0.028 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/14/07 0.000 +/- 0.016

-0.040 +/- 0.160 0.019 +/- 0.044 0.028 +/- 0.074

-0.026 +/- 0.042 0.019 +/- 0.030 06/19/07 0.007 + 0.023

-0.010 +/- 0.200

-0.041 + 0.045

-0.034 +/- 0.083 0.001 +/- 0.050, 0.000 +/- 0.033 09/18/07 0.004 +/- 0.023

-0.180 +/- 0.220

-0.045 +/- 0.061

-0.014 +/- 0.085

-0.022 +/- 0,061

-0.005 +/- 0.039 12/19/07 -0.025 +/- 0.025 0.120 +/- 0.190

-0.011 +/- 0.049

-0.010 + 0.110

-0.031 +/- 0.044 0.041 + 0.043 37-C Ag-il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/14/07 -0.030 + 0.026 0.000 + 0.130

-0.002 + 0.014

-0.004 + 0.015 0.020 + 0.140 0.010 + 0.020 06/19/07 0.003 + 0.035

-0.010 + 0.210 0.008 + 0.021 0.000 + 0.019

-0.070 +-0.260

-0.008 +/- 0.024 09/18/07 -0.016 +/- 0.039 0.060 +/- 0.180

-0.004 + 0.035 0.007 + 0.014 0.100 +/- 0.240 0.004 +/- 0.025 12/19/07 0.008 + 0.022

-0.150 + 0.170

-0.002 + 0.019 0.000 + 0.016

-0.110 + 0.210 0.008 + 0.019 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/14/07 0.003 + 0.019

-0.007 + 0.038 0.025 + 0.026 2.030 + 0.490

-0.007 + 0.015

-0.019 + 0.018 06/19/07 -0.004 + 0.025

-0.086 + 0.073

-0.020 + 0.068 2.530 + 0.640 0.014 +/- 0.019

-0.001 + 0.020 09/18/07 -0.009 +/- 0.038 0.025 +/- 0.050 0.019 + 0.058 1.860 +/- 0.810

-0.009 + 0.032

-0.003 + 0.028 12/19/07 0.002 + 0.020 0.009 +/- 0.046 0.050 + 0.055 2.420 +/- 0.560

-0.004 + 0.020 0.001 + 0.022 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/14/07 0.007 + 0.016

-0.050 + 0.160 0.043 + 0.043

-0.046 + 0.071

-0.004 +/- 0.041

-0.003 + 0.026 06/19/07 0.003 +/- 0.019

-0.020 +/- 0.190

-0.014 +/- 0.063 0.030 + 0.084

-0.043 + 0.048

-0.005 + 0.042 09/18/07 0.012 +/- 0.029 0.380 + 0.280

-0.009 +/- 0.059

-0.035 + 0.086

-0.025 + 0.070 0.003 +/- 0.056 12/19/07 -0:003 +/- 0.019

-0.090 +/- 0.180 0.006 +/- 0.048 0.031 +/- 0.068

-0.036 +/- 0.047 0.024 +/- 0.033 40-X Ag-il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/22/07 0.069 +/- 0.034 0.050 + 0.240

-0.026 +/- 0.024

-0.006 +/- 0.019

-0.090 + 0.250

-0.009 + 0.019 06/26/07 0.058 +/- 0.036

-0.250 +/- 0.320

-0.024 +/- 0.038 0.014 + 0.039

-0.070 + 0.410

-0.021 +/- 0.047 09/01/07 M

12/01/07 N

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 19, Oysters (pCi/g)

Page 3 of 3 Location Collection Date Isotope 40-X Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/22/07 -0.016 +/- 0.060 06/26/07

-0.040 + 0.043 Ru-103 03/22/07 0.031 +/- 0.031 06/26/07 0.003 + 0.036

-0.009 + 0.032 0.004 +/- 0.090 Ru-106

-0.020 +/- 0.280 0.230 +/- 0.390 0.012 +/- 0.073 0.040 +/- 0.100 Sb-125 0.049 +/- 0.067 0.000 +/- 0.100 1.950 +/- 0.740 1.540 +/- 0.780 Th-228 0.000 +/- 0.110 0.010 +/- 0.120 0.014 +/- 0.032 0.038 +/- 0.043 Zn-65

-0.027 +/- 0.064

-0.020+/- 0.110

-0.006 +/- 0.Q35 0.001 +/- 0.052 Zr-95

-0.055 + 0.047

-0.029 +/- 0.077

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 20, Clams (pCi/g)

Page 1 of 2 Location Collection Date Isotope 29 01/03/07 06/14/07 09/05/07 11/05/07 01/03/07 06/14/07 09/05/07 11/05/07 01/03/07 06/14/07 09/05/07 11/05/07 35-X Ag-il0m 0.008 +/- 0.025

-0.011 +/- 0.030

-0.012 +/- 0.025 0.016 +/- 0.035 Cs-137 0.004 + 0.019 0.000 +/- 0.018

-0.026 +/- 0.024 0.008 +/- 0.029

'Ru-103 0.008 +/- 0.019 0.004 +/- 0.020' 0.005 +/- 0.020 0.011 +/- 0.024 Ag-ll0m 0.017 + 0.024

-0.008 +/- 0.020

-0.007 +/- 0.021

-0.029 +/- 0.037 Cs-137

-0.008 +/- 0.018

-0.009 +/- 0.021.

-0.002 +/- 0.019 0.011 +/- 0.023 Ru-103

-0.002 +/- 0.011

-0.007 +/- 0.019

-0.003 +/- 0.015

-0.015 +/- 0.031 Ag-il0m Be-7 Co-58 Co-60 Cr-51 01/03/07 06/14/07 09/05/07 11/05/07 01/03/07 06/14/07 09/05/07 11/05/07 01/03/07 06/14/07 09/05/07 11/05/07

-0.110 +/- 0.160 0.030 +/- 0.160

-0.030 +/- 0.140

-0.060 +/- 0.200 Fe-59 0.000 +/- 0.029 0.014 +/- 0.051 0.016 +/- 0.049 0.000 + 0.064 Ru-106 0.050 +/- 0.180 0.000 +/- 0.180

-0.040 +/- 0.200

-0.140 +/- 0.260 Be-7 0.090 +/- 0.140

-0.070 +/- 0.190 0.000 +/- 0.140 0.080 +/- 0.210 Fe-59 0.010 +/- 0.036 0.042 + 0.049 0.010 +/- 0.038

-0.012 + 0.050 Ru-106 0.000 +/- 0.160

-0.050 +/- 0.190

-0.040 +/- 0.150

-0.050 +/- 0.250 Be-7

-0.060 +/- 0.160 0.050 +/- 0.150

-0.030 +/- 0.150

-0.070 +/- 0.220 Fe-59 0.006 +/- 0.046 0.016 +/- 0.042 0.025 +/- 0.047 0.014 +/- 0.057 0.009 +/- 0.014

-0.002 + 0.020 0.003 +/- 0.019 0.012 +/- 0.026 1-131

-0.031 +/- 0.029

-0.002 +/- 0.025 0.013 +/- 0.038 0.040 +/- 0.040 Sb-125

-0.026 +/- 0.045

-0.041 +/- 0.058 0.032 +/- 0.044 0.008 +/- 0.072 Co-58

-0.003 +/- 0.020

-0.022 + 0.022

-0.002 +/- 0.020

-0.009 +/- 0.026 1-131

-0.004 +/- 0.022

-0.002 +/- 0.031

-0.004 +/- 0.025 0.015 + 0.039 Sb-125

-0.012 +/- 0.041 0.043 +/- 0.052

-0.045 +/- 0.042 0.024 +/- 0.063 Co-58

-0.012 +/- 0.020

-0.011 +/- 0.018 0.002 +/- 0.016 0.009 +/- 0.022 1-131 0.000 +/- 0.027 0.011 +/- 0.031

-0.003 +/- 0.035

-0.020 +/- 0.049 0.003 +/- 0.023

-0.021 +/- 0.031 0.003 +/- 0.011

-0.003 +/- 0.041 K-40 2.080 +/- 0.570 1.540 +/- 0.610 2.020 +/- 0.580 2.680 +/- 0.950 Th-228 0.012 +/- 0.080

-0.037 +/- 0.092

-0.007 +/- 0.077

-0.110 +/- 0.130 Co-60

-0.005 +/- 0.020

-0.001 +/- 0.018 0.001 +/- 0.018 0.020 +/- 0.029 K-40 1.890 +/- 0.570 1.600 +/- 0.610 1.970 1 0.530 2.980 +/- 0.780 Th-228 0.078 +/- 0.076

-0.001 +/- 0.077

-0.025 +/- 0.063 0.040 +/- 0.100 Co-60

-0.002 +/- 0.023 0.020 +/- 0.021 0.014 +/- 0.018 0.008 +/- 0.024 K-40 2.630 +/- 0.660

2.300 +/- 0.590 1.980 +/- 0.570 2.000 +/- 0.730 0.040 + 0.160 0.000 + 0.160 0.080 + 0.170

-0.010 +/- 0.170 Mn-54 0.004 +/- 0.018

-0.019 +/- 0.025

-0.003 +/- 0.019 0.006 +/- 0.030 Zn-65

-0.029 +/- 0.051 0.007 +/- 0.047 0.033 +/- 0.046 0.046 +/- 0.086 Cr-51

-0.040 +/- 0.130

-0.070 +/- 0.210 0.010 + 0.140

-0.040 +/- 0.230 Mn-54

-0.007 +/- 0.018

-0.002 +/- 0.023 0.018 +/- 0.015 0.009 +/- 0.019 Zn-65

-0.032 +/- 0.043 0.029 +/- 0.051

-0.048 +/- 0.053

-0.045 +/- 0.064 Cr-51 0.050 +/- 0.170 0.010 +/- 0.170

-0.070 +/- 0.160 0.000 +/- 0.220 Mn-54 0.003 +/- 0.018 0.007 +/- 0.015

-0.019 +/- 0.019

-0.033 +/- 0.028 Cs-134 0.009 +/- 0.024 0.004 +/- 0.023 0.005 +/- 0.019

-0.009 +/- 0.033 Nb-95 0.005 +/- 0.020

-0.009 +/- 0.022 0.011 +/- 0.024

-0.023 +/- 0.027 Zr-95 0.019 +/- 0.029

-0.023 +/- 0.044 0.006 +/- 0.035

-0.005 +/- 0.049 Cs-134 0.007 +/- 0.018 0.002 +/- 0.019

-0.001 +/- 0.021 0.019 +/- 0.030 Nb-95

-0.004 +/- 0.021 0.015 +/- 0.024 0.007 +/- 0.021 0.001 +/- 0.028 Zr-95

-0.002 +/- 0.029 0.064 +/- 0.048

-0.008 +/- 0.030

-0.010 +/- 0.044 Cs-134 0.001 +/- 0.022 0.000 +/- 0.018 0.005 +/- 0.018 0.015 +/- 0.028 Nb-95

-0.003 +/- 0.022

-0.006 +/- 0.024

-0.011 +/- 0.020 0.000 +/- 0.024 38 01/03/07 0.007 +/- 0.031 06/14/07 -0.005 +/- 0.026 09/05/07 0.020 +/- 0.031, 11/05/07 -0.031 +/- 0.033 Cs-137 01/03/07 -0.004 +/- 0.022 06/14/07 0.015 +/- 0.019 09/05/07 0.000 +/- 0.022 11/05/07 -0.012 +/- 0.026

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 20, Clams (pCi/g)

Page 2 of 2 Location Collection Isotope Date 38 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 01/03/07 0.002 + 0.016

-0.080 +/- 0.210

-0.034 +/- 0.057

-0.026 + 0.087 0.057 +/- 0.054

-0.038 +/- 0.052 06/14/07 0.021 +/- 0.021 0.030 +/- 0.160 0.025 +/- 0.051

-0.027 +/- 0.079 0.003 +/- 0.043 0.019 + 0.034 09/05/07 0.008 +/- 0.019 0.020 + 0.160 0.008 +/- 0.044

-0.046 +/- 0.084 0.015 + 0.042

-0.017 +/- 0.036 11/05/07 -0.011 +/- 0.024 0.070 +/- 0.200 0.009 +/- 0.068

-0.035 +/- 0.093 0.013 +/- 0.065 0.010 + 0.044 39-X Ag-il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/23/07 -0.004 +/- 0.029 0.130 +/- 0.180

-0.028 +/-,0.028

-0.007 +/- 0.025

-0.010 +/- 0.230 0.017 +/- 0.029 06/18/07 -0.007 +/- 0.032

-0.190 +/- 0.230

-0.008 + 0.019

-0.003 + 0.025

-0.060 +/- 0.230

-0.006 +/- 0.017 09/25/07 -0.006 +/- 0.025 0.090 +/- 0.200 0.006 + 0.015

-0.010 + 0.018 0.040 +/- 0.190 0.004 +/- 0.021 11/29/07 -0.023 + 0.036

-0.110 +/- 0.250

-0.008 +/- 0.035

-0.028 +/- 0.037

-0.020 +/- 0.270 0.009 +/- 0.033 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/23/07 0.027 +/- 0.025 0.036 +/- 0.055 0.029 +/- 0.068 06/18/07 0.010 +/- 0.026

-0.027 +/- 0.049 0.008 +/- 0.083 09/25/07 0.005 + 0.019 0.010 + 0.046 0.001 + 0.053 11/29/07 0.009 +/- 0.021 0.048 +/- 0.043 0.005 + 0.045 2.610 +/- 0.670

-0.017 + 0.025

-0.015 + 0.029 2.350 +/- 0.670

-0.012 +/- 0.026 0.005 +/- 0.030 1.420 +/- 0.500 0.002 +/- 0.018 0.011 + 0.023 1.680 +/- 0.700

-0.012 +/- 0.026

-0.021 + 0.034 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/23/07 -0.006 +/- 0.021

-0.040 +/- 0.220 0.024 +/- 0.055

-0.010 +/- 0.110

-0.032 +/- 0.051 0.034 +/- 0.042 06/18/07 0.035 +/- 0.027 0.160 +/- 0.220

-0.010 +/- 0.054

-0.043 +/- 0.081 0.008 +/- 0.049 0.064 +/- 0.053 09/25/07 -0.021 +/- 0.022

-0.050 +/- 0.180

-0.047 +/- 0.046 0.015 +/- 0.073

-0.019 +/- 0.036

-0.004 +/- 0.035 11/29/07 0.010 +/- 0.029

-0.160 +/- 0.310 0.033 +/- 0.074

-0.010 +/- 0.096

-0.049 +/- 0.073 0.014 +/- 0.053 40-X Ag-il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/22/07 0.007 +/- 0.030

-0.080 +/- 0.200

-0.011 +/- 0.025 0.003 +/- 0.027 0.100 + 0.210

-0.022 +/- 0.023 06/26/07 0.000 + 0.036

-0.020 +/- 0.200 0.013 +/- 0.024 0.016 + 0.028

-0.040 + 0.240

-0.010 +/- 0.024 09/27/07 0.017 + 0.031 0.180 +/- 0.220 0.013 +/- 0.045

-0.009 + 0.018 0.050 + 0.250 0.011 + 0.025 12/01/07

) 0 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/22/07 -0.015 +/- 0.031

-0.018 + 0.047 0.010 +/- 0.057 2.280 +/- 0.600 0.008 +/- 0.022 0.003 +/- 0.025 06/26/07 -0.033 + 0.027

-0.007 + 0.063

-0.037 + 0.047 1.500 + 0.580 0.003 +/- 0.024 0.012 + 0.031 09/27/07 0.015 +/- 0.027 0.000 +/- 0.058

-0.017 +/- 0.054 1.650 +/- 0.780

-0.023 +/- 0.040 0.010 + 0.033 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/22/07 0.005 +/- 0.020 06/26/07 0.006 + 0.020 09/27/07 0.000 + 0.023 0.080 +/- 0.220

-0.016 +/- 0.055 0.033 +/- 0.075

-0.024 +/- 0.048

-0.005 +/- 0.044 0.110 + 0.240 0.024 + 0.057

-0.023 + 0.087

-0.031 +/- 0.064 0.011 + 0.049 0.090 +/- 0.320 0.040 +/- 0.064

-0.060 +/- 0.130

-0.056 +/- 0.080

-0.015 +/- 0.050

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 22, Lobsters (pCi/g)

Page 1 of 2 Location Collection Isotope Date 32 Ag-il0m Be-7 Co-58 Co-60 Cr-51 Cs-134 01/31/07 0.009 + 0.026 0.040 +/- 0.140

-0.005 + 0.015 0.009 +/- 0.023 0.020 +/- 0.150

-0.018 + 0.022 05/07/07 0.033 + 0.032

-0.070 + 0.210 0.008 +/- 0.021 0.021 +/- 0.021

-0.010 + 0.200 0.004 + 0.026 08/29/07 0.000 +/- 0.028

-0.030 + 0.220

-0.033 +/- 0.033

-0.010 + 0.034 0.090 +/- 0.250

-0.016 + 0.031 11/13/07 -0.003 +/- 0.027

-0.030 + 0.180

-0.010 + 0.021

-0.017 +/- 0.019

-0.040 +/- 0.230

-0.010 + 0.019 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 01/31/07 -0.007 +/- 0.020 0.002 + 0.038 0.002 + 0.026 05/07/07 0.025 +/- 0.020

-0.006 +/- 0.042 0.007 +/- 0.044 08/29/07 -0.003 +/- 0.027 0.012 + 0.053 0.006 +/- 0.044 11/13/07 0.001 +/- 0.021 0.030 + 0.037 0.017 + 0.055 2.150 + 0.440 0.006 +/- 0.019

-0.008 +/- 0.019 2.250 +/- 0.660

-0.010 +/- 0.021 0.022 + 0.030 2.840 +/- 0.990

-0.003 +/- 0.020

-0.006 + 0.030 2.930 + 0.570

-0.005 +/- 0.018 0.004 +/- 0.027 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 01/31/07 -0.005 +/- 0.020

-0.150 + 0.190 0.020 + 0.041 0.076 +/- 0.067

-0.061 + 0.048

-0.014 +/- 0.031 05/07/07 -0.013 + 0.024

-0.200 +/- 0.220

-0.010 + 0.059

-0.041 + 0.089

-0.025 +/- 0.054 0.034 +/- 0.048 08/29/07 -0.008 +/- 0.031

-0.060 +/- 0.180

-0.036 +/- 0.084 0.050 + 0.120

-0.012 + 0.081 0.023 +/- 0.060 11/13/07 -0.020 +/- 0.024 0.060 + 0.190

-0.022 + 0.044

-0.008 + 0.072

-0.010 + 0.040 0.003 + 0.029 35 Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 02/07/07 -0.012 +/- 0.020

-0.020 + 0.120 0.005 +/- 0.016

-0.004 +/- 0.018 0.040 + 0.120 0.002 + 0.015 05/07/07 -0.003 +/- 0.026

-0.010 + 0.160

-0.008 +/- 0.018 0.008 + 0.020

-0.010 + 0.170

-0.002 +/- 0.022 08/29/07 -0.022 + 0.044

-0.060 +/- 0.220

-0.003 + 0.022 0.006 + 0.027

-0.010 +/- 0.210

-0.017 +/- 0.032 11/19/07 0.000 +/- 0.021 0.030 +/- 0.140

-0.011 +/- 0.018

-0.008 +/- 0.017

-0.040 + 0.180 0.006 +/- 0.018 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 02/07/07 -0.011 +/- 0.018 0.003 +/- 0.037 0.007 +/- 0.028 2.220 +/- 0.450

-0.016 + 0.015

-0.007 +/- 0.016 05/07/07 0.007 +/- 0.020 0.004 +/- 0.040 0.016 +/- 0.036 2.240 10.540

-0.002 + 0.023 0.003 + 0.021 08/29/07 -0.008 +/- 0.027 0.000 +/- 0.050

-0.012 +/- 0.053 3.200 +/- 1.000 0.021 + 0.024 0.002 +/- 0.025 11/19/07 -0.017 +/- 0.019

-0.009 +/- 0.038 0.014 +/- 0.028 2.290 +/- 0.470 0.004 +/- 0.017 0.000 +/- 0.016 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/07/07 -0.019 +/- 0.016

-0.030 +L 0.140 0.024 - 0.037 0.000 +/- 0.064

-0.032 + 0.036

-0.020 + 0.028 05/07/07 0.001 +/- 0.019 0.010 +/- 0.170 0.038 + 0.049

-0.001 +/- 0.078

-0.051 + 0.054

-0.013 +/- 0.034 08/29/07 0.016 + 0.032 0.010. 0.280

-0.075 +/- 0.070 0.020 +/- 0.100

-0.026 + 0.051 0.030 + 0.051 11/19/07 0.009 + 0.018

-0.110 +/- 0.150

-0.015 + 0.045 0.024 +/- 0.067 0.009 + 0.038 0.011 +/- 0.030 37-X Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 02/13/07 0.001 +/- 0.013

-0.022 zL 0.067 0.004 +/- 0.008.

-0.006 + 0.009

-0.051 + 0:088

-0.003 +/- 0.008 05/16/07 0.008 +/- 0.021 0.030 + 0.150

-0.003 +/- 0.016 0.002 +/- 0.014

-0.100 + 0.180 0.017 +/- 0.021 08/29/07 0.006 +/- 0.034

-0.110 + 0.240

-0.001 + 0.028 0.011 + 0.039

-0.150 + 0.220 0.004 + 0.034 11/19/07 -0.003 +/- 0.024 0.090 +/- 0.130

-0.006 +/- 0.021 0.001 + 0.023

-0.010 +0.150 0.000 +/- 0.018 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 02/13/07 -0.002 + 0.009, 0.004 +/- 0.020 0.006 + 0.027 1.660+ 0.240

-0.004 +/- 0.009 0.004 +/- 0.010 05/16/07 0.006 + 0.017

-0.002 + 0.039

-0.020 + 0.054 2.460 + 0.490 0.006 + 0.017 0.001 + 0.020 08/29/07 -0.017 + 0.031

-0.033 +/- 0.059 0.026 + 0.052 1.760 + 0.780

-0.013 +/- 0.028

-0.009 + 0.031 11/19/07 0.000 + 0.021 0.023 + 0.053 0.005 + 0.033 2.720 + 0.690 0.019 +/- 0.017

-0.003 + 0.021

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Table 22, Lobsters (pCi/g)

Page 2 of 2 Location Collection Isotope Date 37-X Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/13/07 -0.004 +/- 0.008 0.005 +/- 0.080

-0.009 +/- 0.021

-0.004 +/- 0.041

-0.004 +/- 0.020 0.010 +/- 0.017 05/16/07 -0.006 +/- 0.021 0.050 +/- 0.160

-0.014 +/- 0.038 0.009 +/- 0.056

-0.023 +/- 0.037 0.003 + 0.032 08/29/07 0.007 +/- 0.023

-0.080 +/- 0.270

-0.025 +/- 0.079 0.010 +/- 0.150

-0.023 +/- 0.071 0.049 + 0.048 11/19/07 0.013 +/- 0.021 0.030 +/- 0.150 0.029 +/- 0.043 0.067 +/- 0.079 0.000 +/- 0.051 0.002 +/- 0.038

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 NOTES FOR DATA TABLES Collection Dates for Air Particulates and lodines are listed as Monday -

Sunday, however the typical change-out days are on Tuesdays A

Low volume (9010 cubic feet, 113 hrs, 9 min) during week of 6/12-6/19 for location 15C, caused by blown pump fuse and broken fuse holder (see CR-07-07823)

B Low volume (3922 cubic feet, 44 hrs, 18 min) during week of 9/18-9/25 for location 02, caused by GFI trip (see CR-07-00990)

C Low volume (10882 cubic feet, 117 hrs, 48 min) during week of 9/25-10/2 for location 02, caused by GFI trip (see CR-07-09900)

D Low volume (6535 cubic feet, 86 hrs, 44 min) during week of 9/25-10/2 for location 15C, caused by switch failure of air sample pump (see CR 10019)

E Low volume (4412 cubic feet, 52 hrs, 46 min) during week of 10/9-10/16 for location 02, caused by GFI trip (see CR-07-10474)

F Goats at location 21 dried up early this year G

Goats at location 24C were only milked to feed the baby goats after mid-May H

Non-pasture grass samples (e.g., hay, grain, etc.)

I Unable to obtain water from location 77X prior to new well installation J

First Quarter flounder & fish-other samples (location 32) were not available (typically scarce during this time of year)

K Third Quarter fish-other sample (location 40X) was not available L

Second Quarter oyster sample at location 34 not available since dock was replaced and tray was lost M

Third Quarter oyster sample at location 40X was not available N

Fourth Quarter oyster sample not obtained at location 40X since diving operations in the quarry have been suspended for safety reasons O

Fourth Quarter clam sample not obtained at 40X since diving operations in the quarry have been suspended for safety reasons

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007

4.

DISCUSSION OF RESULTS This section summarizes the results of the analyses on the REMP (Radiological Environmental Monitoring Program) 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-228 were detected in numerous samples. Be-7, which is produced by cosmic processes, was observed predominantly in airborne and vegetation samples. Th-228 results were variable and are generally at levels higher than plant related radionuclides.

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

4.1 Gamma Exposure Rate (Table 1)

Gamma exposure rate is determined from the integrated exposure measured over a calendar quarter using CaSO4(Tm) Panasonic model UD-804 ASx thermoluminescent dosimeters (TLDs).

In 2000, the TLDs (Victoreen glass bulb CaF 2(Mn)), which historically were used to measure radioactivity around Millstone for over 20 years, were replaced with the Panasonic TLDs.

The dosimeters are strategically placed at a number of on-site locations, as well as at inner and outer off-site locations. Starting in 2001, the collection of TLDs was changed from monthly to quarterly and additional measurement locations were incorporated into the REMP requirements listed in the REMODCM (Radiological Effluent Monitoring and Offsite Dose Calculation Manual).

Three more locations were added in mid-2003 to prepare for monitoring the potential effect of ISFSI (Independent Spent Fuel Storage Installation - Dry Cask Storage).

Two Dry Cask Containers were loaded in the first quarter 2005. Three containers were loaded in mid 2006 and three more in October 2007.

The exposure rate measurements at these three additional locations remains basically unchanged from the background measurements performed prior to any cask loading (9.7 uR/hour at location 73X, 7.7 uR/hour at location 74X and 7.1 uR/hour at location 75X).

4-1

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 Table 1 lists the exposure rate measurements for all 44 monitored locations. Trends similar to those of past years are apparent. These measurements demonstrate the general variations in background radiation between the various on-site and off-site locations and include gamma exposure from all sources of radioactivity. For example, the Weather Shack (location 02), MP3 Discharge (location 05), Environmental Laboratory (location 08), Bay Point Beach (location 09), Pleasure Beach (location 10),

Corey Road (location 48), and Site Switchyard Fence (location 73) experience higher exposure rates due to their proximity to granite beds and stonewalls. In addition, the Mystic (location 13C) and Ledyard (location 14C) control locations experience relatively higher background exposure rate than the other control locations at Norwich and Old Lyme (locations 15C and 16C). The only appreciable effect seen in the recent TLD data is that attributable to the variation in the background radiation that is consistent with previous years.

Figure 4.1-1 shows a historical trend of TLD exposure rate measurements, comparing an annual average of all indicator TLDs, an annual average of all control TLDs, and the annual average of the two most critical indicator locations which are used to represent the two closest site boundary residences in the North-northwest and Northeast directions.

Examination of the average measurements since 1990, shows interesting site changes and site characteristics. For example, the average of all indicator locations for the period when Unit 1 was still in operation (through 1995) display the effects of N-16 BWR turbine building sky-shine to immediate areas onsite. As discussed in previous annual reports, the effects of sky-shine at onsite monitoring stations were increases as high as 6 uR/hr at certain onsite locations. Sky-shine decreased rapidly with distance and was indistinguishable from normal background measurements at even the nearest offsite monitoring stations.

Also apparent in Figure 4.1-1 is the replacement of the historical Victoreen TLD monitoring system with the Panasonic system in year 2000.

The difference in response between the two systems is very apparent, with the new Panasonic TLDs reading 15% to 20% lower. This lower response is consistent for all locations, including both indicator and control locations.

The figure 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 nearby granite at several of the locations.

In 2005 and 2006, there was a small increase noted at locations 5 and 8 caused by storage of the Unit 2 replaced reactor head.

As expected, this increase exhibited a decreasing trend because of radioactive decay.

The head was shipped offsite for disposal in the fourth quarter 2006; the measured levels at these two locations have returned to the background levels measured prior to the head being placed in the storage area. Although not measurable, any resulting site boundary doses are bounded by dose rates from radwaste storage areas and are discussed in Section 5.

4-2

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Figure 4.1-1 MILLSTONE TLI~s uRlhr Historical Annual Gamma Exposure Rate 10-8-

6 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) by passing it through glass fiber particulate filters. These samples are collected weekly and analyzed for gross beta radioactivity. Results are shown on Figure 4.2-1 and Table 2. Gross beta activity remained at levels similar to that seen over the last decade.

Inner and control monitoring locations continue to show no significant variation in measured activities (see Figure 4.2-2). This indicates that any station contribution is not measurable.

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 I-131. No detectable levels of 1-131 were seen in the 2007 charcoal samples.

4-3

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Figure 4.2-1 MILLSTONE AIR PARTICULATE 2007 Gross Beta Radioactivity 0.035.

0.03 0.025 0.02 0.015 0.01 4-Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Figure 4.2-2 MILLSTONE AIR PARTICULATE 5 Year Historical Gross Beta Radioactivity pCi/m3 0.035 Mo Mo Mo Mo Co no t

ý 0

0

0

0 0

0 w0 (0

0

(

w0 w0 I-N N

I I

75,

-5 5

5 a>

M I

z 0

M0 Z

0Z'

~

4-4

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 4.4 Air Particulate Gamma (Table 4A-D)

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 Tables 4A - 4D, indicate the presence of naturally occurring Be-7, which is produced by cosmic radiation. No other positive results are seen. These analyses indicate the lack of station effects.

4.5 Air Particulate Strontium (Table 5)

Prior to 1989 Table 5 was used for listing the data for measurements of Sr-89 and Sr-90 in quarterly composite air particulate filters. The historical data indicated the lack of any detectable station related activity. Since these analyses are not listed in NUREG 1301, these measurements were discontinued.

In the event of widespread station related contamination or other unusual events (such as the 1986 Chernobyl incident), 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.

4.6 Soil (Table 6)

Millstone resumed collection of soil as a required media type in 2001. Prior to 2001, it had not been sampled for over fifteen years. These samples were discontinued due to the fact that, previous sample results never indicated any station related detectable activity. Similarly, since 2001, no station detectable activity has been seen in these samples. The results of these samples, allows for the determination of baseline activity levels in soil. This is particularly important for Cs-i 37, since significant levels from past weapons testing fallout remain in the soil. Baseline levels should be useful in the future, when site characterization and decommissioning of the station become the focus during preparations for License termination. This media is collected annually from one control and two indicator locations.

4.7 Cow Milk (Table 7)

Typically, the most sensitive indicator of fission product existence in the terrestrial environment is radiological analysis of milk samples. Since milk is a widely consumed food, 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.

conservatively within 10 miles since reference 15 specifies 5 miles) have ceased operation. Therefore, the sampling of cow milk has been discontinued until such time dairy activities in the nearby area resume.

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 2007 census can be seen in Appendix A.

If a new d~airy farm is identified close enough to Millstone to be considered an indicator location, the collection of cow milk will resume.

4-5

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 4.8 Goat Milk (Table 8)

When available, these samples are collected twice per month during grazing season and once per month during the rest of the year. Each sample is analyzed for 1-131 and gamma emitting nuclides. Although not required by the REMODCM, samples from each location are composited quarterly and analyzed for Strontium.

Goat milk samples are typically a more sensitive indicator of fission products in the terrestrial environment than cow milk samples. It should be noted that the uptake of radionuclides in milk is dependent on a number of parameters.

These include:

metabolism of these animals, feeding habits, farming practices and feed type. Similar to previous years, Cs-137 and Sr-90 are observed in goat milk.

During past weapons testing periods, samples taken at certain milk locations indicated higher uptake of fallout than others. This was especially apparent in past samples collected in the immediate area around Millstone (see previous Annual Operating Reports). One of these sites, located at 5.2 Mi. NNE of Millstone (previous location 22, sampled from 1994 through 2004), exhibited a trend of showing higher Sr-90 and Cs-137 concentrations than at some of the other locations (including ones located closer to Millstone). The station and regulatory authorities have carefully reviewed past and present data. The presence of the Sr-90 and Cs-137 is the result of residual radioactivity deposited into the environment from the fallout of past nuclear weapons testing. The facts that lead to this conclusion are presented in Section 6.0. These facts include: effluent release totals for these isotopes show insufficient quantities to account for such measurements; Sr-89 and Cs-134 which are chemically similar and generally released in comparable quantities were not detected, and a trend since the early 1960's that shows a consistent declining presence of Cs-137 and Sr-90 in milk from Connecticut.

The 2007 results indicate no detectable 1-131 in this media. In the 1970's and 1980's low levels of plant related 1-131 were seen in some of these samples. However, for over 18 years, no plant related detectable levels of 1-131 have been seen in goat milk samples. The only other occasions where 1-131 was detected were fallout episodes from the Chinese Weapons Tests of the mid to late 1970's and Chernobyl.

Goat milk was unavailable at all locations both early and late in the year. Per requirements, pasture grass or feed is collected as a substitute when milk is not available (see 4.9. Pasture Grass and Feed).

4.9 Pasture Grass and Feed (Table 9)

When the routine milk samples are unavailable, samples of pasture grass are required as a replacement. These samples may also be taken to further investigate the levels of radioactivity in milk. During the winter months and early spring, insufficient growth often prohibits sampling of pasture grass. Feed (e.g., hay) is typically sampled whenever pasture grass is not available.

No station effects are noted in these samples. Cosmic produced Be-7 was observed in the majority of the pasture grass samples and many of the hay samples. Due to its relatively short half-life (52 days), it was not detected in the several of the "older" hay samples. Naturally occurring K-40 was typically approximately two times higher in hay (compared to pasture grass). Similar to goat milk, the Cs-137 values at the indicator and control locations are comparable. This provides an indication that the levels observed are the result of residual weapons testing fallout 4-6

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 4.10 Well Water (Table 10)

These samples were discontinued in 1985, because no detectable station activity was ever observed in these samples.

However, based upon lessons learned at other nuclear plants, including several undergoing decommissioning, sampling was resumed at several locations starting in the fourth quarter 2003. Three additional locations were added in 2005 to monitor potential leakage from the ISESI.

Due to the heightened sensitivity on this potential pathway, three more locations were added in 2006 and five more in 2007. Consistent with the past data, there still has not been any station activity detected in any of these samples.

4.11 Reservoir Water (Table 11)

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

4.12 Fruits and Vegetables (Table 12)

Consistent with past years, this media did not show any station effects.

Naturally occurring K-40 was detected in all samples.

4.13 Broad Leaf Vegetation (Table 13)

Consistent with past years, this media did not show any station effects. Most samples had detectable levels of cosmic produced Be-7, at levels consistent with previous years.

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

4.14 Seawater (Table 14)

In the vicinity of discharge (location 32), seawater is normally sampled by using a continuous sampler.

A technician collects an aliquot from this sampler on a weekly frequency and composites it for monthly analyses. In September 1999, Millstone increased the required analysis frequency for this composite sample to a monthly basis to increase monitoring effectiveness. For the Control Location, Giants Neck (location 37C), six weekly grab samples are obtained for quarterly compositing. In 2003, the LLD for H-3 (tritium) at the indicator location (32) was lowered by approximately a factor of four to further enhance monitoring effectiveness. This lower LLD was continued through 2007.

4-7

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Naturally occurring K-40 was seen all of the samples. Measured plant related levels of H-3 inseawater from the immediate vicinity of discharge (location 32) were observed in 5 of the 12 samples. 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 a fourteen-year trend of H-3 releases in the Millstone liquid effluents versus the measured environmental concentrations from the vicinity of discharge location. As can be noted from the figure, since the restart of Unit 3 in 1998 and Unit 2 in 1999, tritium releases in liquid effluents have risen to levels at, or above, those observed during the pre-shutdown period. The lower LLD enables a direct comparison of effluent monitoring to environmental monitoring for this exposure pathway.

Figure 4.14-2 shows this comparison. This comparison is also more accurate than Figure 4.1-1 since it takes into account the dilution flow during each month.

Dilution flow can change substantially during plant outages. By plotting the data monthly, the resolution of the comparison is further enhanced, although there can be slight discrepancies due to the REMP sample not necessarily being on the last day of each month.

Figure 4.14-1 MILLSTONE LIQUID H-3 RELEASE VERSUS SEAWATER CONCENTRATION 1700 14 Year Historical Trend 1600-1500 Curies 1400 pci/liter 1300 1200 1100-1000-900 800-700-600 500 300 1 f

I V A 200 100 0

M M'

MO M'

M' -

M' M'

M' MO MO C'

M M

4-8

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Figure 4.14-2 MILLSTONE Seawater - Tritium 2007 Samples vs. Effluent Measurements 2200 2000

-*--Seawater Samples 1800 Effluent Measurements 1600 1400 2 1200 0 1000 800 600 400 200 0

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 4.15 Bottom Sediment (Table 15)

Cs-137 was detected one sample from Golden Spur (67X).

This is typical for this location, since it is a fresh water area. The levels of Cs-137 at this location are comparable to those observed in past river water sediments taken from other areas of the Connecticut River.

Because of the relative distance and direction of the Golden Spur location from the station and comparable levels seen the much farther river water locations, the Cs-1 37 detected at Golden Spur is from weapons testing fallout.

In previous years, Cs-1 37 was also detected in the extra samples from Jordon Cove Bar (39X). Although these levels have decreased to below detectable, they are still similar to those at Golden Spur. These low levels likely exhibit some effect of the fresh water drainage from Jordan Brook.

Also in previous years, samples from Jordan Cove Bar indicated detectable quantities of Co-60. Just like the levels of Cs-137, the Co-60 levels have decreased to just below detectable. Somewhat higher levels were noted in 2004 - 2006 and similar levels noted in 2003. Prior to 2003, plant related activity had not been detected in bottom sediment for over a decade. Bottom sediment is not a significant dose pathway to man, especially at areas not typically used by the public. Examinations of other aquatic media, including seafood, sampled from near these locations (discussions that follow) do not show any detectable Co-60 or Cs-1 37.

A new sediment location was added in 2006 near the closest public beach (location 69X). The data for this location again did not indicate any plant related activity.

4-9

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 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.

Low levels of activity (e.g.,

Mn-54, Co-58, Co-60, Zn-65, 1-131 and Ag-110m) have been detected in the past.

However, since 2000 levels have decreased to undetectable for all nuclides except for I-131.

One positive 1-131 measurement was noted in 2004, several in 2005 and in 2006 and one in 2007. There has been a decrease in liquid releases from the station, which has caused all except the 1-131 to become undetectable. The 1-131 levels noted in 2004 through 2007 have been determined to be caused by medical usage. Seaweed has a significant bioaccumulation factor for iodine which makes it an extremely sensitive indicator of iodine in the environment.

Initial investigation of the positive measurement from the September 14, 2005 sample (CR-05-10353) indicated that the 1-131 activity may have been caused by low levels in recent releases. Additional follow-up samples were taken on November 7, 2005, prior to a Unit 2 liquid discharge and on November 8, 2005 after a Unit 2 liquid discharge. These extra samples seemed to confirm the effect from a liquid discharge. The 1-131 levels were quite low and are often hidden within the counting statistics. However, further follow-up in 2006 included sampling in the Thames River and at Rocky Neck to determine if there may have been other sources for the 1-131.

These extra samples indicated the most likely cause for the 2004 - 2007 positive 1-131 results was outfall from wastewater (sewage) treatment plants. The usage of 1-131 in medical treatments is becoming more common and it is not unusual for it to be in wastewater. The New London Waste Water Treatment Plant is located on the west side of the Thames River near Fort Trumbull. Groton has two wastewater treatment plants, one located across the Thames River (and slightly upstream) from the New London treatment plant and the other near Bluff Point. The highest 1-131 results were in the samples from the Thames River, which were taken near the outfall from the New London Waste Water Treatment Plant. There was no 1-131 detected in any of the other aquatic (fish and shellfish) samples.

No Station potentially related radioactivity was detected in aquatic flora in 2007.

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

The activity in Flounder is the same as that seen for the past decade. No activity was observed except for the naturally occurring nuclides.

4.17.2 Fish - Other (Table 17B)

The activity in other fish is the same as that seen for the past decade. No activity was observed in this media except for naturally occurring nuclides, including samples taken from within the quarry.

4-10

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 4.18 Mussels (Table 18)

Similar to the last several years, this sampling media showed no station related radioactivity at all locations.

4.19 Oysters (Table 19)

All locations, except for the quarry, utilize oysters stocked in trays. The oysters used for stocking these trays have been obtained from location 68Z for the last several years. To confirm that the stocked oysters are not initially contaminated, the oysters from location 68Z have also been analyzed. The stocked trays are kept at most of the sampling areas to guarantee samples and facilitate sample collection.

Native oysters are sampled at the quarry (location 40X), which is an extra location.

Due to safety concerns about diving operations, sampling at location 40X was suspended after the 2 nd quarter samples.

Station related Ag-i 1 Om was observed in the two samples from the Quarry (40X). No station related activity was observed in samples from location 32 and from beyond the station discharge area. Although location 32 is labeled as the vicinity of discharge, it has actually been located at the end of the quarry until last year when it was moved to a more accessible area in the middle of the quarry. This was also done to address safety concerns.

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 (Wolfe, 1979).

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 to being undetectable in the station discharges. Starting in 2001, no Zn-65 has been released in liquid effluents and no Zn-65 has been detected in oysters. Figure 4.19-1, shows the historical trend that existed between Zn-65 releases and measured concentrations in quarry oysters. The decreasing trend in effluent radioactive releases is apparent in both the curies released and the measured concentrations in oysters.

Figure 4.19-2 shows the trend of Ag-1 1Om concentration in quarry oysters compared to the liquid effluents discharged.

Similar to Zn-65, the correlation between Ag-110m discharged and the Ag-110m concentration measured in the native quarry oysters is apparent.

Section 5 provides for a comparison of doses based upon effluent measurements (method 1) to doses based upon environmental measurements (method 2). Per regulatory guidance (reference 7), the bioaccumulation factors for both Zn and Ag were adjusted based upon several years of historical data to account for the higher measured uptakes. These adjustments have typically shown good agreement between the two methods, with method 1 usually being conservative. The 2006 and 2007 data indicate an unusual trend (see Section 5, Table 5-2).

Method 2 (REMP dose assessment) indicates higher doses than method 1 (effluent dose assessment). Due to significant effluent reductions over the last several years, the low resulting doses (0.0064 mrem) make this comparison difficult and subject to significant error. Trending of these comparisons is routinely performed and adjustments are made, if appropriate.

4-11

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 Because no station activity was observed at locations beyond the station discharge area and since the two locations in the quarry are on-site and not available for public use, the actual concentration of the nuclides in oysters available for public consumption is much less.

The near-field dilution factor for liquid discharges from the Millstone quarry discharge is a factor of 3. The dose consequence of the station related radioactivity via this pathway is discussed in Section 5.0.

4.20 Clams (Table 20)

Occasionally this media indicates the presence of station related radioactivity.

No station related radioactivity was observed in any of the clam samples taken in 2007.

4.21 Scallops (Table 21)

Scallops are not required by the REMP. However, attempts are made to sample this media to confirm station effects because scallops are available for public consumption.

No scallop samples have been available for several years.

4.22 Lobsters (Table 22)

Like the last several years, no station related radioactivity was detected in this sample media in 2007.

4-12

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Figure 4.19-1 Zn-65 COMPARISON Curies Curies Discharged vs. Native Oyster Concentration pCi/gram 0.1 0.01--

Oyster Conc.

0.01 0.001-0.0001 0.00001 0.000001 0

0 0

0

0) 0

0) 0 0

0

0) 0Q 0t 0

0 0

0 Quarter Figure 4.19-2 Ag-110m COMPARISON Curies Curies Discharged vs. Native Oyster Concentration pCi/gram 0.1 100 Curies Discharged Oyster Conc.

0.01 10 0.0011 0.0001 -

0.1 0.00001

.0.01 0.000001 0.001 Quarter 4-13

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007

5.

OFFSITE DOSE EQUIVALENT COMMITMENTS The off-site dose consequences (dose equivalent commitments) of the station's radioactive liquid and airborne effluents have been evaluated using two methods.

The first method utilizes calculations of direct dose from sources onsite and the station's measured radioactive discharges as input parameters into conservative models to simulate the transport mechanism through the environment to man. This results in the calculation of the maximum dose consequences to individuals. The results of these computations have been submitted to the NRC in the Radioactive Effluent Release Report written in accordance with the Radiological Effluient Monitoring and Offsite Site Calculation Manual, Section l.F.2. This method, which is usually conservative (i.e., computes higher doses than that which actually occur), has the advantage of approximating an upper bound to the dose consequences. This is important in those cases where the actual dose consequence cannot be measured because they are so small as to be well below the capabilities of conventional monitoring techniques.

The second method utilizes the actual measurements of the concentrations of radioactivity in various environmental media (e.g., fish, shellfish) and then computes the dose consequences resulting from the consumption of these foods.

The results of both methods are compared in Table 5.1 for those pathways where a potential dose consequence exists and a comparison is possible. The doses presented in this table are calculated at the location of maximum effect from the station effluents for that pathway and for the critical age group.

For example, the external gamma dose from gaseous effluents is calculated for the site boundary location which is not only the nearest but also has the greatest directional wind frequency and fish and shellfish doses are calculated assuming they are from an area within 500 feet of the station discharge.

Summarizing the data in Table 5.1:

MAXIMUM TOTAL INDIVIDUAL DOSES:

WHOLE BODY =0.21 mremn GI(LLI) =0.0064 mrem Thyroid =0. 129 mrem The majority of the whole body dose is due to a conservative determination of dose (=0.18 mrem) to the nearest resident as a result of direct radiation from on-site radioactive waste operation/storage facilities and continuous occupancy. The GI(LLI) dose is essentially all attributable to the liquid pathway based upon Method 2. The thyroid dose is based upon conservative assessments using Method 1. Since the maximum dose consequence to an individual is at the location of highest dose consequence, doses will be less for all other locations. The average whole body dose to an individual within 50 miles historically is on the order of 1000 times less than the maximum individual whole body dose.

In order to provide perspective on the doses in Table 5.1, the standards on the allowable maximum dose to an individual of the general public are given in 40CFR190 as 25 mremn whole body, 75 mrem thyroid, and 25 mrem to any other organ. These standards are a fraction of the normal background radiation dose of approximately 284 mrem per year and are designed to be inconsequential in regard to public health and safety. Since station related doses are even a smaller fraction of natural background, they have insignificant public health consequences. In fact, the station related doses to the maximum individual are less than 10%

of the variation in natural background in Connecticut.

5-1

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 TABLE 5.1 COMPARISON OF DOSE CALCULATION METHODS MILLSTONE POWER STATION 2007 Annual Dose (millirem)

Methodl1()

M th 2'0 Pathway Individual Organ Unit 1 Unit 2 Unit 3 Station Station (BWR)

(PWR)

Total Airborne Effluents

1. External Gamma Dose Max(2)

Whole Body 0.0000 0.00030 0.0037 0.0040 ND(3)

(gamma air) (')(2

2. Whole Body Dose Max(2)

Whole Body 0.00067 0.0019 0.026 0.029 ND (internal and external)

3. Inhalation, vegetables and Max(2)

Thyroid 0.00066 0.0049 0.123 0.129 ND goat milk Direct Dose Nearest Residence Max(2)

Whole Body N/A N/A N/A

-0.18(l)

<1.8(5,8) 5-2

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 TABLE 5.1 (Cont.)

COMPARISON OF DOSE CALCULATION METHODS MILLSTONE POWER STATION 2007 Annual Dose (millirem)

Max

'Method 1(1 Mehbd2' Pathway Individual Organ Unit I Unit 2 Unit 3 Station Station (BWR)

(PWR)

Total Liquid Effluents

1. Fish Adult Whole Body 0.000000 0.000088 0.000433 0.000521 ND(3)

Teen 0.000000 0.000069 0.000355 0.000424 Child 0.000000 0.000061 0.000329 0.000390 Adult GI(LLI)(')

0.000000 0.000239 0.001176 0.00142 ND Teen 0.000000 0.000174 0.000867 0.00104 Child 0.000000 0.000077 0.000437 0.00052 Adult Liver 0.000000 0.000149 0.000660 0.000810 ND Teen 0.000000 0.000147 0.000606 0.000752 Child 0.000000 0.000135 0.000549 0.000684

2. Shellfish Adult Whole Body 0.000000 0.000047 0.000228 0.000274 0.000009(7)

Teen 0.000000 0.000045 0.000216 0.000260 0.000010 Child 0.000000 0.000053 0.000251 0.000303 0.000011 Adult GI(LLI) 0.000000 0.000616 0.000876 0.00149 0.0064(7)

Teen 0.000000 0.000413 0.000642 0.00107 0.0044 Child 0.000000 0.000161 0.000276 0.00044 0.0016 Adult Liver 0.000000 0.000124 0.000567 0.000691 0.000016(7)

Teen 0.000000 0.000130 0.000581 0.000711 0.000016 Child 0.000000 0.000129 0.000578 0.000708 0.000013 5-3

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 Notes:

1. Except for direct dose, method 1 uses measured station discharges and meteorological data as input parameters to transport-to-man models that conservatively calculate dose to people; method 2 uses actual measured concentrations in environmental media to estimate the dose.

2. Maximum individual - The maximum individual dose is the dose to the most critical age group at the location of maximum concentration of station related activity. The dose to the average individual is much less than the maximum individual dose.

3. ND Not Detectable - No station related activity could be detected above natural background or above the minimum detectable level (MDL).

4. The dominant source of direct dose from the station is from storage and movement of radioactive waste.

Storage of radioactive waste is allowed in several areas onsite.

Operation of the storage facilities is limited by design to ensure that the maximum direct dose at the site boundary from each area does not exceed one millirem. Actual exposure throughout the year was maintained much less than this operational limit. Each facility is monitored onsite by the Radiation Protection Department using TLDs.

The exposure measured for each facility TLD was corrected for distance to the nearest site boundary residence. The resultant exposure was conservatively, multiplied by 1.5 to account for sky-shine. These maximum estimated doses from each facility were summed for a cumulative site commitment of approximately 0.18 millirem.

The whole body dose from airborne effluents was 0.029 and from liquid effluents was 0.0008. This results in a total estimated whole body dose to the maximum individual of 0.21 mrem (0.18 + 0.029 + 0.0008).

5. Measured dose was derived from monthly TLD readings. There are two residences that qualify as the closest residence; each has a TLD near enough to use as an estimate to each residence. The one with the highest average dose rate was used to estimate the direct dose to the closest residence. A background dose rate was subtracted. This background was derived from the average of the five control TLD locations.

This method is very conservative assuming natural exposure influences, such as granite, are actually plant related exposure.

This method provides a bounding high value.

The exposure measurements of the select indicator locations are influenced by natural background exposure differences caused by the many granite out-croppings typical of the Millstone area. Historical data has shown that TLD sample locations in the vicinity of granite can be dramatically influenced by natural radioactivity contained within the granite.

6.

GI (LLI) - Gastrointestinal Tract - Lower Large Intestine.

7. Based on measured levels in the native quarry oysters.

A measured near field dilution factor of 3 was used to adjust for the fact that these oysters are on-site and inaccessible to the public. This factor adjusts the measured on-site concentration to that which could occur to a public accessible off-site location after dilution of the effluent by the Long Island Sound.

The measured levels in the stocked oysters within the quarry were about one-half the native quarry oysters.

For conservatism, it was assumed the maximum individual consumed primarily oysters (activity in clams was much lower than in the oysters).

8. Based upon the conservatively assuming no correction for building shielding and occupancy.

5-4

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007

6.

DISCUSSION The evaluation of the effects of station operation on the environment requires the careful consideration of many factors. Those factors depend upon the media being affected. They include station release rates, effluent dispersion, occurrence of nuclear weapons tests, seasonal variability of fallout, local environment, and locational variability of fallout.

Additional factors affecting the uptake of radionuclides in milk include soil conditions (mineral content, pH, etc.),

quality of fertilization, quality of land management (e.g., irrigation), pasturing habits of animals, and type of pasturage. Any of these factors could cause significant variations in the measured radioactivity. A failure to consider these factors could cause erroneous conclusions.

Consider, for example, the problem, of deciphering the effect of station releases on the radioactivity measured in milk samples. This is an important issue because this product is widely consumed and several fission products readily concentrate in this media. Some of these fission products, such as 1-131 and Sr-89 are relatively short-lived. Therefore they can result from either station effluents, nuclear weapons tests or nuclear incidents (e.g. Chernobyl).

Sr-89's lifetime is longer than 1-131's, therefore it will remain around for much longer periods of time. The even longer-lived fission products, Sr-90 and Cs-137, cause more of a concern.

These isotopes are still remaining from the weapons testing era of the 1960's. This results in measurable amounts of Sr-90 and Cs-137 appearing in some milk samples. Distinguishing between this "background" of fallout activity and station effects is of prime interest for a Radiological Environmental Monitoring Program.

In reviewing the historical and present Sr-90 and Cs-137 measured in cow and goat milk in the areas around Millstone station, a casual observer could notice that in some cases the levels of these isotopes are higher at farms closer to the station than at those further away from the station.

The station's effluents might at first appear to be responsible.

However, the investigation of the following facts proves this conclusion wrong.

(1) The stations accurately measure many fission products, including Sr-90 and Cs-137 in their releases. Based on these measurements and proven models developed by the Nuclear Regulatory Commission, concentrations in the environment can be calculated.

These calculations (generally conservative, see Section 5.0) show that insufficient quantities of Sr-90 and Cs-137 have been released from the plants to yield the measured concentrations in milk.

(2) Over the many years of station operation, "Sr-89 has often been released in comparable quantity to Sr-90. Since they are chemically similar, comparable levels should have been detected in milk if the Sr-90 was station related.

No station related Sr-89 has ever been detected in milk samples.

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

(4) Dairy milk sampling in Connecticut began in the 1960's, several years prior to nuclear station operation. The highest levels of weapons fallout related Sr-90 and Cs-137 (see Figures 6-1 and 6-2), were measured in the years prior to station operation.

Samples taken in the immediate station areas have always shown higher levels of weapons related fallout than samples taken from the Central Connecticut Region (CT Pooled Milk). Radioactivity levels of fallout related Sr-90 and Cs-137 have decreased significantly since the 1964 Nuclear Test Ban Treaty due to decay.

6-1

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 (5) Local variability of Sr-90 and Cs-1 37 in milk is common throughout the United States. Due to the variability in soil conditions, pasturing methods, rainfall, etc., it is the rule rather than the exception. Therefore, it is not surprising that certain farms have higher levels of radioactivity than other farms. In fact, in the past there are some cases where the farms further from the station have higher Sr-90 and Cs-1 37 values than the farms that are closer to the station.

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

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

Dominion has carefully examined the data throughout the years and has presented in this report all cases where station related radioactivity could be detected.

An analysis of the potential exposure to the maximum individual from any station related activity has been performed and shows that in all cases the exposure is insignificant.

The Connecticut Department of Environmental Protection (DEP) performs an independent check on certain environmental program analyses. The results of their analyses are comparable to the results from this program's analyses. These comparisons can be used as a cross-reference to verify measured station activity.

DEP performed a comprehensive review of all the historical Millstone data in 2006 (reference 17). It concluded that "the collective sampling in and around Millstone Power Station show expected levels of residual fallout from weapons testing and the Chernobyl event and are unrelated to the operation of the Millstone Power Station."

Figure 6-1 Strontium-90 in Milk pi/liter 25 r-61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 Year 6-2

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 Figure 6-2 Cesium-137 in Milk 14i/lit 140 I, ter m

120 100 80 60 40 20 0

I CT Pooled Milk Haddam area Milk Millstone area Milk I

61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 Year Dairy milk is no longer available in the Millstone area, Haddam Neck no longer collects milk, and CT Pooled milk has not been collected by the State of CT since 1994. Graphs provided to show historical trends.

CY Start-up occurred:

July 24, 1967 MP2 Start-up occurred:

December, 1975 MP1 Start-up occurred:

October 26, 1970 MP3 Start-up occurred:

January 23, 1986 6-3

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007

7.

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,i June 1972.

3) National Council on Radiation Protection and Measurements, Report No. 93, "Ionizing Radiation Exposures of the Population of the United States," September 1987.

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)

Millstone Training Brochure.

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 025-02, December 2006.

9)

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

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

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

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

13) ION/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-1 301, "Offsite Dose Calculation Manual Guidance:

Standard Radiological Effluent Controls for Pressurized Water Reactors," April 1991.

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

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

7-1

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2006 APPENDIX A LAND USE CENSUS FOR 2007 A-1

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 TABLE A-1 Dairy Cows Within 20 miles of Millstone Point-2007 Direction N

N NNE NNE NNE NNE NE NE NE NE ENE ENE WNW NW NNW Distance 14 Miles 20 Miles 16 Miles 17 Miles 18 Miles 19 Miles 13.5 Miles 18 Miles 18 Miles 19 Miles 17.3 Miles 20 Miles 10.5 Miles 10.4 Miles 12.4 Miles Location Preston Norwich Norwich Preston Preston Preston Ledyard Preston North Stonington North Stonington North Stonington North Stonington Lyme Lyme Salem

of Cows 60*

350 100 270 300*

135 50*

105 150 100 300 500 200 5

2 Note: No cow farms on this list are used for sam'pling, all farms are greater than ten miles from plant.

unknown (based upon 2005 census)

A-2

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 TABLE A-2 Dairy Goats Within 20 miles of Millstone Point-2007 Direction N

N NE ENE ENE ENE WNW NW NNW NNW NNW NNW 2.4 Miles 20 Miles 2.7 Miles 2 Miles 12 Miles 13 Miles 18 Miles 17.3 Miles 12.3 Miles 18 Miles 20.8 Miles 29 Miles Sample Location Waterford (LOCATION 21)

North Franklin Waterford (LOCATION 22)

Waterford Stonington Stonington Haddam East Haddam Salem Colchester Colchester Hebron (LOCATION 24)

of Goats 6/4*

2/2 9/0 1/0 7/3 5/3 6/3 1/1 50/30 37/20**

6/3**

73/36 Number of Goats/Number of Milkers Unable To Contact As Of This Time, 2006 data A-3

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 TABLE A-3 2007 Resident/Garden Survey Downwind Direction N

NNE NE ENE E

ESE SE SSE S

SSW SW WSW W

WNW NW NNW Distance to Closest Resident (meters) 1500 860 790 1590 1500 1690 3700 3190 2870 2400 770 740 Distance to Closest Garden (meters) 1490 820 800 1590 1670 1990 3840 3210 2950 2740 2180 1020

N/A - not applicable (over water sectors)

A-4

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 APPENDIX B DNC QA PROGRAM B-1

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 INTRODUCTION Dominion Nuclear Connecticut (DNC) maintains an independent non-required quality assurance (QA) program as part of the radiological environmental monitoring program (REMP).

The QA program consists of contractor appraisals and quality control samples.

This independent program is applicable to all Dominion nuclear facilities because they share a joint contract with AREVA-NP Environmental Laboratory.

DNC QA PROGRAM The DNC independent QA Program includes spikes of various sample media and duplicate samples.

Sample spikes are a check on the accuracy of results of the contractor's radioanalyses. Duplicate samples tests the contractor's precision, or reproducibility of results, by comparing analytical results of split samples. The number and type of DNC QA Program quality control samples are defined in Millstone Nuclear Power Station Procedure REMP 1.4, "Quality Control of Radiological Environmental Monitoring Program."

An investigation is conducted on any result or trend that does not satisfy acceptance criteria.

OTHER QA PROGRAMS The DNC Independent QA Program is not the only QA Program which monitors REMP radioanalysis performance. Other programs include:

1. Contractor lab's internal QA program. In addition to the Millstone quality control samples, the radioanalysis contractor has its own quality control samples.

In total, at least five percent of the contractor's sample analyses include quality control samples.

2. Contractor lab's interlaboratary comparison program with an independent third party, Analytics, Inc.

Results of the Analytics intercomparison are contained in Appendix C.

Primary contractor participation in an interlaboratory comparison program is required by station Technical Specifications. The Analytics comparison satisfies this requirement.

3. Contractor lab's participation in the National Institute of Standards and Technology (NIST)

Measurement Assurance Program (MAP), the Environmental Resource Associates (ERA)

Proficiency Test (PT) Program, the Department of Energy (DOE) Quality Assessment Program (QAP), and the Mixed Analyte performance Evaluation Program (MAPEP). The lab participates in these interlaboratory QA programs because of other clients' needs, not because of nuclear power station environmental sample analyses.

However, some of these intercomparison samples are also applicable to nuclear power environmental samples.

RESULTS OF MILLSTONE QA PROGRAM FOR CONTRACTOR RADIOANALYSES Criteria for passing QA sample analysis is that the result be within 20% of the known spike except in the case of Sr-89 or Sr-90 spikes in milk which have to be within 30% of the known spike. To allow more tolerance for lower activity spikes the following alternate criterion may be used: If the two sigma error range of the analyzed result includes the known spike value the result passes.

The Millstone QA Program indicated that the contractor lab's environmental radiological analysis program was adequate in 2007. Results are shown on Table 2. All of the TLD spike tests satisfied the procedural criteria.

Of the 67 individual nuclide analysis results on QA samples, 63 passed the acceptance criteria, a 94 % success rate. Of the 4 failures, 3 were low by 21 - 35% and one was low by 56%. The later was caused by plateout problems with the spiked solution. These results are consistent with last year's results.

B-2

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 TABLE 1 2007 QUALITY CONTROL SAMPLES SAMPLE TYPE QC SAMPLES (Note 1)

ROUTINE SAMPLES TLD Spike 16 160 Milk - Strontium 1

12 Milk - Iodine 4

/

-30 Milk - Gamma (Note 2)

-30 Pasture Grass/Hay Gamma (Milk 0

-30 Substitute)

Water - Gamma 6

60 Water - Tritium 4

60 Fish/Invertebrate - Gamma 4

80 Vegetation/Aquatic Flora/Sediment/Soil-0 74 Gamma Air Particulate Gross Beta 4

416 Iodine 4

416 Gamma 2

32 FOOTNOTE (Table 1):

1. All samples are spikes except fish/invertebrate which are duplicate oyster samples.

2. Gamma in water QA spikes are treated as milk surrogates.

TABLE 2 RESULTS OF 2007 QUALITY CONTROL SAMPLE ANALYSES*

SAMPLE TYPE ANALYSES PASSED ANALYSES FAILED TLD Spike 16 0

Milk - Strontium 1

0 Milk - Iodine 4

0 Water-Gamma 33 3 (note 1)

Water - Tritium 4

0 Oysters - Gamma 4

0 Air Particulate Gross Beta 4

0 Iodine 3

1 (note 2)

Gamma 10 0

TOTALS TLDs: 16 TLDs: 0 Individual Nuclides: 63 Individual Nuclides: 4 FOOTNOTE (Table 2):

To provide a more detailed comparison of pass versus failure, each nuclide was considered for the gamma and strontium analyses.

1. These ranged from 21 to 56 percent low, caused by Ag plateout issues

2. Low by 25%

B-3

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 APPENDIX C

SUMMARY

OF INTERLABORATORY COMPARISONS C-1

Dominion Nuclear Connecticut, Inc.

Annual Radiological Environmental Operating Report Millstone Station 2007 INTRODUCTION This appendix covers the Intercomparison Program of the AREVA-NP Environmental Laboratory as required by technical specifications for each Millstone unit. AREVA-NP uses QA/QC samples provided by Analytics, Inc to monitor the quality of analytical processing associated with the Radiological Environmental Monitoring Program (REMP).

The suite of Analytics QA/QC samples are designed to be comparable with the pre-1996 US EPA Interlaboratory Cross-Check Program in terms of sample number, matrices, and nuclides. It was modified to more closely match the media mix presently being processed by AREVA-NP and includes:

milk for gamma (10 nuclides) and low-level (LL) Iodine-131 analyses once per quarter water for gamma (10 nuclides) and low-level (LL) Iodine-131 analyses during the 1st and 3rd quarters water for Sr-89 and Sr-90 analyses during the 1st and 4th quarters water tritium analysis during the 2nd and 4th quarters air filter for gamma (9 nuclides) analyses during the 2nd quarter air filter for gross beta analysis during the 1st and 3rd quarters charcoal filter for 1-131 during the 1st and 3rd quarters air filter for Sr-89 and Sr-90 analyses during the 2nd and 4th quarters In addition to the Analytics Intercomparison Program, AREVA-NP also participates in other intercomparsion programs which include radionuclides and media similar to those required by the Millstone program.

These programs are the National Institute of Standards and Technology (NIST) Measurement Assurance Program (MAP), the Environmental Resource Associates (ERA) Proficiency Test (PT) Program, the Department of Energy (DOE) Quality Assessment Program Program (QAP), and the Mixed Analyte Performance Evaluation Program (MAPEP).

RESULTS Intercomparison program results are evaluated using AREVA-NP's internal bias acceptance criterion. The criterion is defined as within 25% of the known strontium value for samples containing both Sr-89 and Sr-90 and within 15% of the known value for other radionuclides, or within two sigma of the known value. Any sample analysis result which does not pass the criteria is investigated by AREVA-NP.

Analytics Intercomparison Program results are included on pages C-3 through C-6 for 2007.

Since the Fourth Quarter Analytics results are not usually available until mid April, the previous year's results are listed.

A total of 113 analysis results were obtained with 109 passing criteria, a 96% success rate. The four failures ranged from 82 to 84% of the known activities.

C-2

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 AREVA NP ENVIRONMENTAL LABORATORY ANALYTICS RADIOLOGICAL ENVIRONMENTAL CROSS-CHECK PERFORMANCE EVALUATION Ratio Sample Quarter/

Sample Reported Known E-LAB/

Number Year Media Nuclide Units Value Value Analytics E5222-162 4th/2006 Water H-3 pCi/L 14570 14800 0.99 E5223-162 4th/2006 Water Sr-89 pCi/L 68.8 72.6 0.95 E5223-162 4th/2006 Water Sr-90 pCi/L 5.56 5.9 0.94 E5224-162 4th/2006 Filter Gross Alpha pCi 63.3 67.2 0.94 E5224-162 4th/2006 Filter Gross Beta pCi 209.6 203 1.03 E5225-162 4th/2006 Filter Ce-141 pCi 179.0 185 0.97 E5225-162 4th/2006 Filter Cr-51 pCi 277.9 273 1.02 E5225-162 4th/2006 Filter Cs-134 pCi 89.1 92.7 0.96 E5225-162 4th/2006 Filter Cs-137 pCi 158.8 149 1.06 E5225-162 4th/2006 Filter Co-58 pCi 54.0 52.8 1.02 E5225-162 4th/2006 Filter Mn-54 pCi 71.2 69.8 1.02 E5225-162 4th/2006 Filter Fe-59 pCi 51.0 50.2 1.02 E5225-162 4th/2006 Filter Zn-65 pCi 104.3 103 1.01 E5225-162 4th/2006 Filter Co-60 pCi 166.7 177 0.94 E5226-162 4th/2006 Filter Sr-89 pCi 69.5 74.2 0.94 E5226-162 4th/2006 Filter Sr-90 pCi 6.46 6.06 1.07 E5227-162 4th/2006 Milk 1-131LL pCi/L 71.0 70.8 1.00 E5227-162 4th/2006 Milk 1-131 pCi/L 64.8 70.8 0.91 E5227-162 4th/2006 Milk Ce-141 pCi/L 277.7 294 0.94 E5227-162 4th/2006 Milk Cr-51 pCi/L 430.7 433 0.99 E5227-162 4th/2006 Milk Cs-134 pCi/L 141.4 147 0.96 E5227-162 4th/2006 Milk Cs-137 pCi/L 233.9 237 0.99 E5227-162 4th/2006 Milk Co-58 pCi/L 83.1 83.8 0.99 E5227-162 4th/2006 Milk Mn-54 pCi/L 110.6 111 1.00 E5227-162 4th/2006 Milk Fe-59 pCi/L 82.3 79.7 1.03 E5227-162 4th/2006 Milk Zn-65 pCi/L 171.4 164 1.05 E5227-162 4th/2006 Milk Co-60 pCi/L 273.1 281 0.97 E5228-162 4th/2006 Charcoal 1-131 pCi 84.2 87.1 0.97 C-3

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 AREVA NP ENVIRONMENTAL LABORATORY ANALYTICS ENVIRONMENTAL CROSS CHECK PROGRAM PERFORMANCE EVALUATION Ratio Sample Quarter/

Sample Reported Known E-LAB/

Number Year Media Nuclide Units Value Value Analytics E5238-162 1 st/2007 Water Gross Alpha pCi/L 117 112 1.05 E5238-162 1 st/2007 Water Gross Beta pCi/L 104 100 1.04 E5239-162 1stJ2007 Water 1-131LL pCi/L 88.3 89.8 0.98 E5239-162 1st/2007 Water 1-131 pCi/L 74.3 89.8 0.83 E5239-162 1 st/2007 Water Ce-141 pCi/L 257 258 1.00 E5239-162 1 st/2007 Water Cr-51 pCi/L 218 213 1.02 E5239-162 1st/2007 Water Cs-134 pCi/L 93.6 97.1 0.96 E5239-162 1st/2007 Water Cs-137 pCi/L 197 204 0.97 E5239-162 1 st/2007 Water Co-58 pCi/L 86.2 85.8 1.00 E5239-162 1st/2007 Water Mn-54 pCi/L 155 158 0.98 E5239-162 1st/2007 Water Fe-59 pCi/L 87.1 91.7 0.95 E5239-162 1 st/2007 Water Zn-65 pCi/L 886 869 1.02 E5239-162 1st/2007 Water Co-60 pCi/L 131 132 0.99 E5240-162 1st/2007 Water Sr-89 pCi/L 127 137 0.92 E5240-162 1st/2007 Water Sr-90 pCi/L 9.39 9.99 0.94 E5241-162 1st/2007 Charcoal 1-131 pCi 67.6 70.2 0.96 E5242-162 1st/2007 Filter Gross Alpha pCi 67.2 69.1 0.97 E5242-162 1st/2007 Filter Gross Beta pCi 69.4 61.9 1.12 E5243-162 1st/2007 Milk 1-131LL pCi/L 85.1 85.2 1.00 E5243-162 lst/2007 Milk 1-131 pCi/L 75.4 85.2 0.88 E5243-162 1st/2007 Milk Ce-141 pCi/L 294 297 0.99 E5243-162 lst/2007 Milk Cr-51 pCi/L 226 245 0.92 E5243-162 1st/2007 Milk Cs-134 pCi/L 104 112 0.93 E5243-162 lst/2007 Milk Cs-137 pCi/L 228 234 0.97 E5243-162 lst/2007 Milk Co-58 pCi/L 98.1 98.8 0.99 E5243-162 lst/2007 Milk Mn-54 pCi/L 184 182 1.01 E5243-162 1st/2007 Milk Fe-59 pCi/L 109 106 1.03 E5243-162 ist/2007 Milk Zn-65 pCi/L 1041 1000 1.04 E5243-162 1st/2007 Milk Co-60 pCi/L 148 152 0.98 E5244-162 1st/2007 Milk Sr-89 pCi/L 126 137 0.92 E5244-162 lst/2007 Milk Sr-90 pCi/L 8.85 10 0.88 C-4

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 AREVA NP ENVIRONMENTAL LABORATORY ANALYTICS RADIOLOGICAL ENVIRONMENTAL CROSS-CHECK PERFORMANCE EVALUATION Ratio Sample Quarter/

Sample Reported Known E-LAB/

Number Year Media Nuclide Units Value Value Analytics E5334-162 2nd/2007 Water H-3 pCi/L 8520 9040 0.94 E5335-162 2nd/2007 Filter Gross Alpha Pci 122.7 125 0.98 E5335-162 2nd/2007 Filter Gross Beta pCi 137.9 122 1.13 E5336-162 2nd/2007 Filter Ce-141 pCi 94.1 107 0.88 E5336-162 2nd/2007 Filter Cr-51 pCi 230 273 0.84 E5336-162 2nd/2007 Filter Cs-134 pCi 114.3 129 0.89 E5336-162 2nd/2007 Filter Cs-137 pCi 86.3 90.1 0.96 E5336-162 2nd/2007 Filter Co-58 pCi 98.4 106 0.93 E5336-162 2nd/2007 Filter Mn-54 pCi 83.3 88.5 0.94 E5336-162 2nd/2007 Filter Fe-59 pCi 79 89.0 0.89 E5336-162 2nd/2007 Filter Zn-65 pCi 167 178 0.94 E5336-162 2nd/2007 Filter Co-60 pCi 112 127 0.89 E5337-162 2nd/2007 Filter Sr-89 pCi 71.4 91.2 0.78 E5337-162 2nd/2007 Filter Sr-90 pCi 10.1 12.4 0.82 E5338-162 2nd/2007 Milk 1-131LL pCi/L 73.5 70.1 1.05 E5338-162 2nd/2007 Milk 1-131 pCi/L 75 70.1 1.07 E5338-162 2nd/2007 Milk Ce-141 pCi/L 168 200 0.84 E5338-162 2nd/2007 Milk Cr-51 pCi/L 447 512 0.87 E5338-162 2nd/2007 Milk Cs-134 pCi/L 223 242 0.92 E5338-162 2nd/2007 Milk Cs-137 pCi/L 165 169 0.98 E5338-162 2nd/2007 Milk Co-58 pCi/L 203 198 1.02 E5338-162 2nd/2007 Milk Mn-54 pCi/L 178 166 1.07 E5338-162 2nd/2007 Milk Fe-59 pCi/L 170 167 1.02 E5338-162 2nd/2007 Milk Zn-65 pCi/L 343 334 1.03 E5338-162 2nd/2007 Milk Co-60 pCi/L 238 238 1.00 C-5

Dominion Nuclear Connecticut, Inc.

Millstone Station Annual Radiological Environmental Operating Report 2007 AREVA NP ENVIRONMENTAL LABORATORY ANALYTICS ENVIRONMENTAL CROSS CHECK PROGRAM PERFORMANCE EVALUATION Ratio Sample Quarterl Sample Reported Known E-LAB/

Number Year Media Nuclide Units Value Value Analytics E5430-162 3rd /2007 Water Gross Alpha pCi/L 112 109 1.03 E5430-162 3rd /2007 Water Gross Beta pCi/L 218 214 1.02 E5431-162 3rd /2007 Water 1-131LL pCi/L 83.4 80.1 1.04 E5431-162 3rd /2007 Water 1-131 pCi/L 80.2 80.1 1.00 E5431-162 3rd /2007 Water Ce-141 pCi/L 176 182 0.97 E5431-162 3rd /2007 Water Cr-51 pCi/L 228 249 0.92 E5431-162 3rd /2007 Water Cs-1 34 pCi/L 111 127 0.87 E5431-162 3rd/2007 Water Cs-137 pCi/L 112 112 1.00 E5431-162 3rd /2007 Water Co-58 pCi/L 94.3 98.1 0.96 E5431-162 3rd /2007 Water Mn-54 pCi/L 141 144 0.98 E5431-162 3rd /2007 Water Fe-59 pCi/L 94.8 95.1 1.00 E5431-162 3rd /2007 Water Zn-65 pCi/L 186 174 1.07 E5431-162 3rd /2007 Water Co-60 pCi/L 120 127 0.94 E5432-162 3rd /2007 Charcoal 1-131 pCi 66.5 69.6 0.96 E5433-162 3rd /2007 Filter Gross Alpha pCi 86.4 105 0.82 E5433-162 3rd /2007 Filter Gross Beta pCi 207 213 0.97 E5434-162 3rd /2007 Milk 1-131LL pCi/L 87.2 85.2 1.02 E5434-162 3rd /2007 Milk 1-131 pCi/L 82.9 85.2 0.97 E5434-162 3rd /2007 Milk Ce-141 pCi/L 196 211 0.93 E5434-162 3rd /2007 Milk Cr-51 pCi/L 282 289 0.97 E5434-162 3rd /2007 Milk Cs-1 34 pCi/L 141 147 0.96 E5434-162 3rd /2007 Milk Cs-137 pCi/L 126 131 0.96 E5434-162 3rd /2007 Milk Co-58 pCi/L ill 114 0.97 E5434-162 3rd /2007 Milk Mn-54 pCi/L 171 168 1.02 E5434-162 3rd /2007 Milk Fe-59 pCi/L 112 111 1.01 E5434-162 3rd /2007 Milk Zn-65 pCi/L 212 202 1.05 E5434-162 3rd /2007 Milk Co-60 pCi/L 145 148 0.98 E5435-162 3rd /2007 Milk Sr-89 pCi/L 89.2 94.9 0.94 E5435-162 3rd /2007 Milk Sr-90 pCi/L 12.9 13.1 0.98 C-6

ML081270530

Contents

Text

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

Navigation menu

ML081270530

Text

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

SUMMARY

Navigation menu

Search