ML051250439

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2004 Annual Radiological Environmental Operating Report
ML051250439
Person / Time
Site: Millstone  Dominion icon.png
Issue date: 04/29/2005
From: Price J
Dominion Nuclear Connecticut
To:
Document Control Desk, NRC/FSME
References
05-208
Download: ML051250439 (121)
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Text

Dominion Nuclear Connecticut, Inc.

Millstone Power Station ... pDominion-Rope Ferry Road Waterford, CT 06385 APR 2 9 2005 U.S. Nuclear Regulatory Commission Serial No.05-208 Attention: Document Control Desk MPS Lic/GJC RO Washington, DC 20555 Docket Nos. 50-245 50-336 50-423 License Nos. DPR-21 DPR-65 NPF-49 DOMINION NUCLEAR CONNECTICUT. INC.

MILLSTONE POWER STATION UNITS 1, 2, AND 3 2004 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT This letter transmits the Annual Radiological Environmental Operating Report for the Millstone Power Station, for the period January 2004 through December 2004. This satisfies the provisions of Section 5.7.2 of Unit 1 Permanently Defueled Technical Specifications (PDTS), and Sections 6.9.1.6a and 6.9.1.3 of the Millstone Units 2 and 3 Technical Specifications, respectively.

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

Dodson at (860) 447-1791, extension 2346.

Very truly yours, Prce ice President - Millstone 15

Serial No.05-208 2004 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. A. B. Wang Project Manager U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 7E1 Rockville, MD 20852-2738 Mr. R. Prince NRC Inspector U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 Mr. V. Nerses Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 8C2 Rockville, MD 20852-2738 Mr. G. F. Wunder Project Manager U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 08-B-1A Rockville, MD 20852-2738 Mr. S. M. Schneider NRC Senior Resident Inspector Millstone Power Station

Serial No.05-208 2004 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.05-208 Docket Nos. 50-245 50-336 50-423 License Nos. DPR-21 DPR-65 NPF-49 Attachment 1 2004 Annual Radiological Environmental Onerating Report Millstone Power Station Units 1, 2, and 3 Dominion Nuclear Connecticut, Inc. (DNC)

Millstone Power Station 2004 Radiological Environmental Operating Report January 1, 2004 - December 31, 2004

7. -

Dominion Nuclear Connecticut, Inc.

Unit License Docket 1 DPR-21 50-245 2 DPR-65 50-336 3 NPF49 50-423

P

, Dominion

ANNUAL RADI OLOGICAL ENVIRONMENTAL OPERATING REPORT MILLSTONE POWER STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM 2004 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 2004 TABLE OF CONTENTS

1. EXECUTIVE

SUMMARY

1

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 3-3
4. DISCUSSION OF RESULTS 4-1 4.1. Gamma Exposure Rate (Table 1) 4-1 4.2. Air Particulate Gross Beta Radioactivity (Table 2) 4-3 4.3. Airborne Iodine (Table 3) 4-5 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) 4-6 4.8. Goat Milk (Table 8) 4-6 4.9. Pasture Grass and Feed (Table 9) 4-7 4.10. Well Water (Table 10) 4.7 4.11. Reservoir Water (Table 11) 4-8 4.12. Fruits and Vegetables (Table 12) 4-8 4.13. Broad Leaf Vegetation (Table 13) 4.8 4.14. Seawater (Table 14) 4-8 4.15. Bottom Sediment (Table 15) 4-11 4.16. Aquatic Flora (Table 16) 4-11 4.17. Fish (Tables 17A and 17B) 4-12 4.18. Mussels (Table 18) 4-12 4.19. Oysters (Table 19) 4-12 4.20. Clams (Table 20) 4-13 4.21. Scallops (Table 21) 4-14 4.22. Lobsters (Table 22) 4-14
5. OFFSITE DOSE EQUIVALENT COMMITMENTS 5-1
6. DISCUSSION 6-1 APPENDIX A - LAND USE CENSUS FOR 2004 A-1 APPENDIX B - DNC QA PROGRAM B-1 APPENDIX C -

SUMMARY

OF INTERLABORATORY COMPARISONS C-1 APPENDIX D - ERRATA FOR 2003 D-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Executive Summary I

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004

1. EXECUTIVE

SUMMARY

The radiological environmental monitoring program for the Millstone Power Station was continued for the period January through December 2004, in compliance with the Technical Specifications and the Radiological Effluent Monitoring and Offsite Dose Calculation Manual.

The Radiological Protection and Chemistry Department of Dominion Nuclear Connecticut, Inc. (DNC) prepared this annual report.

Radiological Protection and Environmental Services staff performed sample collection and preparation. Framatome ANP DE&S Environmental Laboratory performed gamma exposure rate measurements and laboratory analyses.

Thermoluminescent dosimeters (TLDs) were used to measure direct gamma exposure in the vicinity of the station and as far away as 14 miles. Radiochemical and radiological counting analyses of samples were performed to detect the presence of any station related radioactivity.

Samples included: air particulate and charcoal filters, soil, goat milk, pasture grass, hay, well water, broad leaf vegetation, fruits, vegetables, sea water, bottom sediment, aquatic flora, fish, mussels, oysters, clams, and lobsters. In evaluating the results of these analyses it is necessary to consider the variability of natural and man-made sources of radioactivity, radionuclide distribution in the environment and radionuclide uptake in environmental media. This variability is dependent on many factors including station release rates, past spatial variability of radioactive fallout from nuclear weapons tests and on-going redistribution of the fallout, contribution from cosmically produced radioactivity, soil characteristics, farming practices, and feed type. Significant variations in measured levels of radioactivity could be caused by any one of these factors. Therefore, these factors need to be considered in order to properly explain any variations in radiation detected and to distinguish between natural and nuclear station related radioactivity.

Millstone Unit 1 is permanently shutdown. The annual capacity factor for Millstone Unit 2 was 97.6% based on Design Electrical Rating (DER). The annual capacity factor for Unit 3 was 88.2%. Unit 3 was shutdown in the second quarter for 3R09 refueling and maintenance. The radioactive releases of gaseous effluents in 2004 were comparable to years when one or more units operated for the majority of the year. Radioactive releases in liquid effluents continue to be low.

No station effects were detected in terrestrial media. The predominant radioactivity, except for a few aquatic sample results, was that from outside sources, such as fallout from nuclear weapons tests and naturally occurring radionuclides. Monitoring of the aquatic environment in the area of the discharge indicated the presence of the following station related radionuclides: Cobalt-60, Silver-lOim, Cesium-137 and Tritium. Due to l-l

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 the decreasing trend in liquid effluent releases, a corresponding decrease is observed in measured levels of radionuclides in the environment. Doses from the 2004 measured levels are well below those required by each Unit's Safety Technical Specifications (10CFR50 Appendix I, Design Guidelines).

Cesium-137 and Strontium-90 were detected in goat milk. Cesium-137 was also found in several pasture grass and hay samples and all soil samples. These levels are the result of nuclear weapons testing in the 1960's and not the result of station operation. This can be concluded because insufficient quantities of these isotopes have been released by the station to account for the measured concentrations and the presence of these isotopes have been consistently declining since the early 1960's after signing of the Nuclear Test Ban Treaty.

The radiation dose (dose equivalent commitment) to the general public from the station's discharges has been evaluated by two methods. One method utilizes the measured station's discharges and conservative transport models and the other utilizes the measured concentrations of radioactivity in the environmental media. The maximum whole body dose (station boundary) that could occur to a member of the general public as a result of station operation was 0.17 millirem. This dose is 0.7 percent of the standard (i.e., 25 millirem to the whole body at the station site boundary) as set by the Environmental Protection Agency on the maximum allowable dose to an individual of the general public.

Historically, the average whole body dose for a member of the public residing within 50 miles of the station is generally three orders of magnitude less than the maximum individual whole body dose. The standards of the Environmental Protection Agency are a small fraction (less than 10 percent) of the 284 mrem per year normal Connecticut resident background radiation (NCRP94) and are designed to be inconsequential in regard to public health and safety. Station related doses are even a smaller fraction of the natural background. Therefore, the station related doses have insignificant public health consequences.

1-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004

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 2.1-1 and 2.1-2. 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. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 2-1 Environmental Monitoring Program Sampling Types and Locations Location Direction &Distance Number*' Location Name ' - From Release Point** Sample Types 1-I On-site - Old Millstone Rd. 0.6 Mi, NNW TLD, Air Particulate, Iodine, Vegetation 2-1 On-site - Weather Shack 0.3 Mi, S TLD, Air Particulate, Iodine 3-I On-site - Bird Sanctuary 0.3 Mi, NE TLD, Air Particulate, Iodine, Soil 4-I On-site - Albacore Drive 1.0 Mi, N TLD, Air Particulate, Iodine, Soil 5-I MP3 Discharge 0.1 Mi, SSE TLD 6-I Quarry Discharge 0.3 Mi, SSE TLD 7-I Environmental Lab Dock 0.3 Mi, SE TLD 8-I Environmental Lab 0.3 Mi, SE TLD 9-I Bay Point Beach 0.4 Mi, W TLD 10-I Pleasure Beach 1.2 Mi, E TLD, Air Particulate, Iodine, Vegetation 11-I New London Country Club 1.6 Mi, ENE TLD, Air Particulate, Iodine 12-C Fisher's Island, NY 8.0 Mi, ESE TLD 13-C Mystic, CT 11.5 Mi, ENE TLD 14-C Ledyard, CT 12.0 Mi, NE TLD, Soil 15-C Norwich, CT 14.0 Mi, N TLD, Air Particulate, Iodine 16-C Old Lyme, CT 8.8 Mi, W TLD 17-I Site Boundary 0.5 Mi, NE Vegetation 21-I Goat Location #1 2.0 Mi, N Milk 22-I Goat Location #2 5.2 Mi, NNE Milk 24-C Goat Location #4 29.0 Mi, NNW Milk 25-I Within 10 Miles Within 10 Miles Fruits & Vegetables 26-C Beyond 10 Miles Beyond 10 Miles Fruits & Vegetables 27-I Niantic 1.7 Mi, WNW TLD, Air Particulate, Iodine 28-I Two Tree Island 0.8 Mi, SSE Mussels 29-I West Jordan Cove 0.4 Mi, NNE Clams 30-I Niantic Shoals 1.5 Mi, NNW Mussels 31-I Niantic Shoals 1.8 Mi, NW Bottom Sediment, Oysters 31-X Niantic Shoals 1.8 Mi, NW Scallops 32-I Vicinity of Discharge Bottom Sediment, Oysters, Lobster, Fish, Seawater 32-X Vicinity of Discharge Fucus 33-I Seaside Point 1.8 Mi, ESE Bottom Sediment 33-X Seaside Point 1.8 Mi, ESE Fucus 34-I Thames River Yacht Club 4.0 Mi, ENE Bottom Sediment 34-X Thames River Yacht club 4.0 Mi, ENE Oysters 35-I Niantic Bay 0.3 Mi, WNW Lobster, Fish 35-X Niantic Bay 0.3 Mi, WNW Bottom Sediment, Seawater, Clams, Fucus

  • 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. Annual Radiological Environmental Operating Report Millstone Station 2004 Location Direction & Distance Number* Location Name From Release Point** Sample Types 36-I  : Black Point 3.0 Mi, WSW Oysters 36-X Black Point 3.0 Mi, WSW Bottom Sediment, Fucus 37-C Giant's Neck 3.5 Mi, WSW Bottom Sediment, Oysters, Seawater 37-X Giant's Neck 3.5 Mi, WSW Lobster 38-I Waterford Shellfish Bed #1 1.OMiNW Clams 39-X Jordon Cove Bar 0.8 Mi, NE Bottom Sediment, Clams, Seawater, Fucus 40-X Quarry Fish, Oysters 41-I Myrock Avenue 3.2 Mi, ENE TLD 42-I Billow Road 2.4 Mi, WSW TLD 43-I Black Point 2.6 Mi, SW TLD 44-I Onsite - Schoolhouse 0.1 Mi, NNE TLD 45-I Onsite Access Road 0.5 Mi, NNXV TLD 46-I Old Lyme - Hillcrest Ave. 4.6 Mi, WSW TLD 47-I East Lyme - W. Main St. 4.5 Mi, W TLD 48-I East Lyme - Corey Rd. 3.4 Mi, WNW TLD 49-I East Lyme - Society Rd. 3.6 Mi, NW TLD 50-I East Lyme - Manwaring Rd. 2.1 Mi, W TLD 51-I East Lyme - Smith Ave. 1.5 Mi, NW TLD 52-I Waterford - River Rd. 1.1 Mi, NNW TLD 53-I Waterford - Gardiners Wood Rd. 1.4 Mi, NNE TLD 55-I Waterford - Magonk Point 1.8 Mi, ESE TLD 56-I New London - Mott Ave. 3.7 Mi, E TLD 57-I New London - Ocean Ave. 3.6 Mi, ENE TLD 59-I Waterford -Miner Ave. 3.4 Mi, NNE TLD 60-I Waterford - Parkway South 4.0 Mi, N TLD 61-I Waterford - Boston Post Rd. 4.3 Mi, NNW TLD 62-I East Lyme - Columbus Ave. 1.9 Mi, WNW TLD 63-I Waterford - Jordon Cove Rd. 0.8 Mi, NE TLD 64-I Waterford - Shore Rd. 1.1 Mi, ENE TLD 65-I Waterford - Bank St. 3.2 Mi, NE TLD 66-X NAP Parking Lot - Fitness Center 0.4 Mi, NW TLD 67-X Golden Spur 4.7 Mi, NNW Bottom Sediment 68-Z Ram Island 9.6 Mi., ESE Oysters 70-C Background Well NA Well Water 71-I Onsite Well Onsite Well Water 72-I Onsite Well Onsite Well Water 73-Y Site Switchyard Fence 0.3 Mi, N TLD Ball Field Foul Pole 0.6 Mi, N TLD 75-Y Waterford - Windward Way & 0.5 Mi, NE TLD Shotgun

  • Key: I - Indicator C - Control X or Z - Extra - sample not required
    • The release points are the MP1 stack for terrestrial locations and the quarry cut for aquatic locations.

2-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 2-2 Required Sampling Frequency & Tyrpe of Analysis Exposure Pathway -- No. of Sampling & Collection- Type of Analysis and/or Sample Locations Frequency

1. Gamma Dose - 40a 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 I-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 I-131 on each on pasture; monthly at other sample; Sr-89 and Sr-90 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 3 Quarterly Gamma Isotopic and Tritium on each sample

7. Bottom Sediment 5 Semiannual Gamma Isotopic on each sample 7a. Soil 3 Quarterly 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) I I (a) Two or more TLDs or TLD with two or more elements per location 2-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Figure 2.1-1 Millstone Sampling Locations 2-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Figure 2.1-2 Millstone Sampling Locations (Within 2 miles)

Niantic Bay Cove

'9 II 0.5 Miles island ei E# TLD Monitoring (only)

E TLD and Air Monitoring (particulates & iodine)

(I Terrestrial Monitoring (milk, grass, fruit & vegetables, soil, or leaves) Islam O Aquatic Monitoring (seawater, sediment, flora, fish, mussel, oyster, clam, or lobster) 2-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 2.2. Samples Collected DuringReport Period The following table summarizes the number of samples of each type collected and analyzed during 2004:

Number of Number of Number of Sample Type Required Samples Required Samples Extra Samples Analyzed Analyzed Gamma Exposure 160 1201 12 (Environmental TLD)

Air Particulates 416 416 0 Air Iodine 416 416 0 Soil 12 12 0 Goat Milk 57 252 0 Pasture Grass Variable3 31 0 Fruit and Vegetables 8 8 1 Broad Leaf Vegetation 6 6 12 Sea Water 16 16 0 Well Water 12 12 3 Bottom Sediment 10 10 15 Aquatic Flora 0 0 18 Fish 16 144 4 Mussels 8 8 0 Oysters 16 154 8 Clams 8 8 8 Lobster 8 8 4 Total All Types 1,169 1,125 85 2nd Quarter TLDs were lost (see CR 04-07177).. TLDs were collected at the end of the second quarter as scheduled and delivered along with the routine weekly air samples to site warehouse for shipment to vendor. The air samples and TLDs were placed in separate bags and placed together in the shipment preparation area. The assignment report for the TLDs was placed in the bag with the TLDs while the air sample transmittal form was left outside the bag. Air samples were sent and received by the vendor, however the TLDs were lost. Subsequent efforts to locate the TLDs were unsuccessful. Several corrective actions have been implemented to prevent recurrence. Deviations from the sampling schedule are permitted for legitimate reasons.

2 Pasture grass (or hay) sampled as necessary to substitute for unavailable milk.

3 Depends upon availability of goat milk samples.

4 Due to sample unavailability, not all required fish and oyster samples could be obtained.

2-7

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004

3. RADIOCHEMICAL RESULTS 3.1. Summary Table In accordance with the Radiological Effluent Monitoring Manual (REMM),Section I.F. 1, a summary table of the radiochemical results has been prepared and is presented in Table 3-1.

The mean and range recorded are based only upon detectable measurements. The fraction in parentheses (next to the mean for the results) indicates the ratio of measurements that are considered above the detection limit for each individual analysis. The range of values above the detection limit is listed in parentheses below the mean of the detectable measurements.

A more detailed analysis of the data is given in Section 4.0 where a discussion of the variations in the data explains many aspects that are not evident in the Summary Table because of the basic limitation of data summaries. The data summaries include the extra 'X samples (those taken in addition to the required locations or frequency) collected throughout the year. These samples are taken in an effort to enhance the monitoring program or are the results of special studies.

3-1

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 1 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location vith IHighest Mean Locations Type Total LLD Mean Name Distance Mean I No Range I Directioni Range TLD Gamma 132 - 8.14 (117/117) 08 0.3 mi 12 (3/3) 8.22 (15/15)

(uR/hr) Dose (4.41-12.7) SE (11.3-12.7) (5.52-10.4)

AP Gross Beta Gross 416 10 18.7 (362/364) 15-C 14mi 19.2 (52/52) 19.2 (52/52)

(pCi/m3 x 1000) Beta (6.8-37.1) N (7.1-35) (7.1-35)

Air Iodine 1-131 416 70 (0/364) < LLD (0/52)

(pCi/m3 x 1000)

AP Gamma Ba-140 32 - (0/28) < LLD (0/4)

(pCi/m3 x 1000)

Be-7 32 - 91.1 (25/28) 15-C 14mi 114 (4/4) 114 (4/4)

(57-119) N (93-132) (93-132)

Ce-141 32 - (0/28) < LLD (0/4)

Ce-144 32 - (0/28) < LLD (0/4)

Co-58 32 - (0/28) < LLD (0/4)

Co-60 32 - (0/28) < LLD (0/4)

Cr-51 32 - (0/28) < LLD (0/4)

Cs-134 32 50 (0/28) < LLD (0/4)

Cs-137 32 60 (0/28) < LLD (0/4)

Mn-54 32 - (0/28) < LLD (0/4)

Nb-95 32 - (0/28) < LLD (0/4)

Ru-103 32 - (0/28) < LLD (0/4)

Ru-106 32 - (0/28) < LLD (0/4)

Zr-95 32 - (0/28) < LLD (0/4)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 2 of 16 DOCKETS 50-245, 50-336 & 50-339 1

Soil Be-7 12 - (0/8) 14-C 12 mi 0.36 (1/4) 0.36 (1/4)

(pCi/g dry) NE (0.36-0.36) (0.36-0.36)

Ce-141 12 - (0/8) - <LLD (0/4)

Ce-144 12 - (0/8) - <LLD (0/4)

Co-58 12 - (0/8) - <LLD (0/4)

Co-60 12 - (0/8) - <LLD (0/4)

Cr-51 12 - (0/8) - <LLD (0/4)

Cs-134 12 0.15 (0/8) - <LLD (0/4)

Cs-137 12 0.18 0.745 (8/8) 14-C 12 mi 1.52 (4/4) 1.52 (4/4)

(0.44-1.23) NE (1.37-1.66) (1.37-1.66)

Fe-59 12 - (0/8) - <LLD (0/4)

K-40 12 - 9.91 (8/8) 04 I mi 11.9(4/4) 11.8 (4/4)

(6.3-12.5) N (10.7-12.5) (10.2-13)

Mn-54 12 - (0/8) - <LLD (0/4)

Nb-95 12 - (0/8) - <LLD (0/4)

Ru-103 12 - (0/8) - <LLD (0/4)

Ru-106 12 - (0/8) - <LLD (0/4)

Sb-125 12 - (0/8) - <LLD (0/4)

Th-228 12 - 0.84 (8/8) 14-C 12 mi 1.34 (4/4) 1.34 (4/4)

(0.48-1.21) NE (1.18-1.55) (1.18-1.55)

Zn-65 12 - (0/8) - <LLD (0/4)

Zr-95 12 - (0/8) - <LLD (0/4)

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 3 of 16 DOCKETS 50-245, 50-336 & 50-339 I1 Goat Milk Ba-140 25 70 (0/15) < LLD (0/10)

KCL)

Cs-134 25 15 (0/15) < LLD (0/10)

Cs-137 25 18 9.58 (4/15) 22 5.2 mi 11.7(1/5) (0/10)

(5.3-11.7) NNE (11.7-11.7)

I-131 25 1 (0/15) < LLD (0/10)

K-40 25 - 1616 (15/15) 22 5.2 mi 1725 (5/5) 1672 (10/10)

(1220-1920) NNE (1630-1773) (1550-1880)

La-140 25 25 (0/15) < LLD (0/10)

Sr-89 6 - (0/4) < LLD (0/2)

Sr-90 6 - 5.18 (3/4) 22 5.2 mi 7.15 (2/2) 1.7 (2/2)

(1.24-8.1) NNE (6.2-8.1) (1.62-1.78)

Pasture Grass Ba-140 31 - (0/22) < LLD (0/9)

(Hay)

(pCitg wet)

Be-7 31 1.99 (18/22) 21 2mi 2.13 (6/9) 2.04 (6/9)

(0.4-4.36) N (0.46-3.86) (0.7-4.32)

Ce-141 31 (0/22) < LLD (0/9)

Ce-144 31 (0/22) < LLD (0/9)

Co-58 31 (0/22) < LLD (0/9)

Co-60 31 (0/22) < LLD (0/9)

Cr-51 31 (0/22) < LLD (0/9)

Cs-134 31 0.06 (0/22) < LLD (0/9)

Cs-137 31 0.08 0.125 (2/22) 21 2 mi 0.125 (2/9) 0.064 (4/9)

(0.088-0.162) N (0.088-0.162) (0.043-0.079)

Fe-59 31 (0/22) < LLD (0/9)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 4 of 16 DOCIKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean Locations Type Total LD Mean Name Distance Mean No Range Directions Range Pasture Grass I-131 31 0.06 (0/22) < LLD (0/9)

(Ilay)

(pCi/g wet)

K-40 31 - 6.96 (22/22) 24-C 29 nii 10.4 (9/9) 10.4 (9/9)

(2.66-14.6) NNW (3.46-19.6) (3.46-19.6)

La-140 31 - (0/22) - < LLD (0/9)

Mn-54 31 - (0/22) - < LLD (0/9)

Nb-95 31 - (0/22) - < LLD (0/9)

Ru-103 31 - (0/22) - < LLD (0/9)

Ru-106 31 - (0/22) - < LLD (0/9)

Sb-125 31 - (0/22) - < LLD (0/9)

Th-228 31 - (0/22) - < LLD (0/9)

Zn-65 31 - (0/22) - < LLD (0/9)

Zr-95 31 - (0/22) - < LLD (0/9) 9 Well Water Ba-140 15 60 (0/10) - < LLD (0/5)

(pc1'1)

Be-7 15 - (0/10) - < LLD (0/5)

Co-58 15 15 (0/10) - < LLD (0/5)

Co-60 15 15 (0/10) - < LLD (0/5)

Cr-51 15 - (0/10) - < LLD (0/5)

Cs-134 15 15 (0/10) - < LLD (015)

Cs-137 15 18 (0/10) - < LLD (015)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 5 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

  • Locations Type Total LLD Mean Name Distance l Mean I No Range IDirections Range WVell Water Fe-59 15 30 (0/10) - - <LLD (0/5)

(pCiKM)

H-3 12 2000 (0/8) - - <LLD (0/4)

I-131 15 15 (0/10) - - <LLD (0/5)

K-40 15 - (0/10) - - <LLD (0/5)

La-140 15 15 (0/10) - - <LLD (0/5)

Mn-54 15 15 (0/10) - - <LLD (0/5)

Nb-95 15 15 (0/10) - - <LLD (0/5)

Ru-103 15 - (0/10) - - <LLD (0/5)

Ru-106 15 - (0/10) - - <LLD (0/5)

Sb-125 15 - (0/10) - - <LLD (0/5)

Sr-90 15 - (0/10) 70-C 2.2(1/5) 2.2(1/5)

(2.2-2.2) (2.2-2.2)

Th-228 15 - (0/10) - - <LLD (0/5)

Zn-65 15 30 (0/10) - - <LLD (0/5)

Zr-95 15 30 (0/10) - - <LLD (0/5)

Fruits & Ba-140 9 - (0/5) - - <LLD (0/4)

Vegetables (PCi/g wet)

Be-7 9 0.188 (2/5) 25 10-mi 0.188(2/5) (0/4)

(0.17-0.206) (0.17-0.206)

Ce-141 9 (0/5) - <LLD (0/4)

Ce-144 9 (0/5) - <LLD (0/4)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 6 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

  • Locations Type Total Mean Name Distance Mean No Range Directionl Range Fruits & Co-58 9 (0/5) <LLD (0/4)

Vegetables (pCi/g wet)

Co-60 (0/5) - <LLD (0/4)

Cr-51 - (0/5) - <LLD (0/4)

Cs-134 0.06 (0/5) - <LLD (0/4)

Cs-137 0.08 (0/5) - <LLD (0/4)

Fe-59 - (0/5) - <LLD (0/4)

I-131 0.06 (0/5) - <LLD (0/4)

K-40 - 1.98 (5/5) 25 10-mi 1.98(5/5) 1.7 (4/4)

(0.49-3.91) (0.49-3.91) (0.8-3.06)

La-140 - (0/5) - <LLD (0/4)

Mn-54 - (0/5) - <LLD (0/4)

Nb-95 - (015) - <LLD (0/4)

Ru-103 - (0/5) - <LLD (0/4)

Ru-106 - (0/5) - <LLD (0/4)

Sb-125 - (0/5) - <LLD (0/4)

Th-228 - (0/5) - <LLD (0/4)

Zn-65 - (0/5) - <LLD (0/4)

Zr-95 - (0/5) - <LLD (0/4)

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 7 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

  • Locations Type Total LLD Mean Name l Distance l Mean I No Range I Directioni Range Broadleaf Ba-140 18 (0/18) < LLD (0/0)

Vegetation (pCi/g wet)

Be-7 18 0.807 (11/18) 01 0.6mi 0.94 (3/6) (0/0)

(0.34-2.23) NNW (0.84-1.01)

Ce-141 18 (0/18) < LLD (0/0)

Ce-144 18 (0/18) < LLD (0/0)

Co-58 18 (0/18) < LLD (0/0)

Co-60 18 (0/18) < LLD (0/0)

Cr-51 18 (0/18) < LLD (0/0)

Cs-134 18 60 (0/18) < LLD (0/0)

Cs-137 18 80 0.05 (2/18) 17 0.5 mi 0.05 (2/6) (0/0)

(0.048-0.051) NE (0.048-0.051)

Fe-59 18 - (0/18) < LLD (0/0) 1-131 18 60 (0/18) < LLD (0/0)

K-40 18 - 2.76 (18/18) 01 0.6 mi 3.07 (6/6) (0/0)

(1.36-3.74) NNW (1.63-3.74)

La-140 18 - (0/18) < LLD (0/0)

Mn-54 18 - (0/18) < LLD (0/0)

Nb-95 18 - (0/18) < LLD (0/0)

Ru-103 18 - (0/18) < LLD (0/0)

Ru-106 18 - (0/18) < LLD (0/0)

Sb-125 18 - (0/18) < LLD (0/0)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 8 of 16 DOCKETS 50-245, 50-336 & 50-339 Medium or Pathway Sampled (Units) Type Analysis Total No LLD

_ IReported Indicator Locations Mean Range Location with Highest Mean Name Distance l Direction Mean Range Control Locations Mean Range Non-Routine Measure-ments Broadleaf Th-228 18 - (0/18) - - < LLD (0/0)

Vegetation (pCi/g wet)

Zn-65 18 - (0/18) - - < LLD (0/0)

Zr-95 18 - (0/18) - - < LLD (0/0)

Sea Water Ba-140 16 60 (0/12) - - < LLD (0/4)

(pCi/L)

Be-7 16 - (0/12) - - <LLD (0/4)

Co-58 16 15 (0/12) - - < LLD (0/4)

Co-60 16 15 (0/12) - - < LLD (0/4)

Cr-51 16 - (0/12) - - < LLD (0/4)

Cs-134 16 15 (0/12) - - < LLD (0/4)

Cs-137 16 18 (0/12) - - < LLD (0/4)

Fe-59 16 30 (0/12) - - < LLD (0/4)

H-3 16 2000 828 (7/12) 32 828 (7/12) (0/4)

(243-1660) (243-1660)

I-131 16 15 (0/12) - - < LLD (0/4)

K-40 16 - 288 (11/12) 32 288 (11/12) 281 (3/4)

(255-320) (255-320) (241-337)

La-140 16 15 (0/12) - - < LLD (0/4)

Mn-54 16 15 (0/12) - - < LLD (0/4)

Nb-95 16 15 (0/12) - - < LLD (0/4)

Ru-103 16 - (0/12) - - < LLD (0/4)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 9 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

  • Locations Type Total LLD Mean Name Distance l Mean I No Range I Directioni Range Sea Water Ru-106 16 - (0112) - <LLD (0/4)

(pCi/L)

Sb-125 16 - (0/12) - <LLD (0/4)

Th-228 16 - (0/12) - <LLD (0/4)

Zn-65 16 30 (0/12) - <LLD (0/4)

Zr-95 16 30 (0/12) - <LLD (0/4)

Bottom Sediment Ag-I 10m 25 - (0/23) - <LLD (0/2)

(pCi/g dry)

Be-7 25 - (0/23) - <LLD (0/2)

Co-58 25 - (0/23) - <LLD (0/2)

Co-60 25 - 0.089 (2/23) 39-X 0.8 mi 0.089 (2/4) (0/2)

(0.083-0.094) NE (0.083-0.094)

Cr-51 25 - (0/23) - <LLD (0/2)

Cs-134 25 0.15 (0/23) - <LLD (0/2)

Cs-137 25 0.18 0.105 (5/23) 67-X 4.5 mi 0.147 (2/2) (0/2)

(0.028-0.195) NNW (0.098-0.195)

Fe-59 25 - (0/23) - <LLD (0/2) 1-131 25 - (0/23) - <LLD (0/2)

K-40 25 - 13.8 (23/23) 36-X 3 mi 16.4 (1/1) 15.6 (2/2)

(7.83-17) WSW (16.4-16.4) (14.8-16.3)

Mn-54 25 - (0/23) - <LLD (0/2)

Nb-95 25 - (0/23) - <LLD (0/2)

Ru-103 25 - (0/23) - <LLD (0/2)

Ru-106 25 - (0/23) - <LLD (0/2)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 10 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

  • Locations Type Total LLD Mean Name Distance l Mean I No Range I Directionl Range Bottom Sediment Sb-125 25 (0/23) <LLD (0/2)

(pCi/g dry)

Th-228 25 0.959 (22/23) 31 1.8 rni 3.47 (2/2) 0.477 (2/2)

(0.204-4.21) NW (2.724.21) (0.263-0.69)

Zn-65 25 (0/23) <LLD (0/2)

Zr-95 25 (0/23) <LLD (0/2)

Aquatic Flora Ag-110m 18 (0/18) <LLD (0/0)

(pCi/g wet)

Be-7 18 0.189 (2/18) 36-X 3 mi 0.24 (1/3) (0/0)

(0.138-0.24) WSW (0.24-0.24)

Co-58 18 (0/18) <LLD (0/0)

Co-60 18 (0/18) <LLD (0/0)

Cr-5I 18 (0/18) <LLD (0/0)

Cs-134 18 (0/18) <LLD (0/0)

Cs-137 18 (0/18) <LLD (0/0)

Fe-59 18 (0118) <LLD (0/0)

I-131 18 0.021 (1/18) 36-X 3 mi 0.021 (1/3) (0/0)

(0.021-0.021) WSW (0.021-0.021)

K40 18 6.55 (18/18) 32-X 7.28 (4/4) (0/0)

(4.83-9.01) (5.51-9.01)

Mn-54 18 (0/18) <LLD (0/0)

Nb-95 18 (0/18) <LLD (0/0)

Ru-103 18 (0/18) <LLD (0/0)

Ru-106 18 (0/18) <LLD (0/0)

Sb-125 18 (0/18) <LLD (0/0)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 11 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

  • Locations Type Total LLD Mean Name Distance A Mcan I No Range I Directionl Range Aquatic Flora Th-228 18 0.044 (1/18) 36-X 3 mi 0.044 (1/3) (0/0)

(pCi/g wet) (0.044-0.044) WSW (0.044-0.044)

Zn-65 18 - (0/18) <LLD (0/0)

Zr-95 18 - (0118) <LLD (0/0)

Fish-Flounder Ag-110m 6 - (0/6) <LLD (0/0)

(pCilg wet)

Be-7 6 - (0/6) <LLD (0/0)

Co-58 6 0.13 (0/6) <LLD (0/0)

Co-60 6 0.13 (0/6) <LLD (0/0)

Cr-51 6 - (016) <LLD (0/0)

Cs-134 6 0.13 (0/6) <LLD (0/0)

Cs-137 6 0.15 (0/6) <LLD (0/0)

Fe-59 6 0.26 (0/6) <LLD (0/0)

I-131 6 - (0/6) <LLD (0/0)

K-40 6 - 3.46 (6/6) 35 0.3 mi 3.79 (3/3) (0/0)

(2.894.09) WNW (3.57-4.09)

Mn-54 6 0.13 (016) <LLD (0/0)

Nb-95 6 - (0/6) <LLD (0/0)

Ru-103 6 - (016) <LLD (0/0)

Ru-106 6 - (0/6) <LLD (0/0)

Sb-125 6 - (0/6) <LLD (0/0)

Th-228 6 - (0/6) <LLD (0/0)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 12 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

  • Locations Type Total LLD Mean Name Distance l Mean I No Range I Directioni Range Fish-Flounder Zn-65 6 0.26 (0/6) - - <LLD (0/0)

(pCi/g wet)

Zr-95 6 - (0/6) - - <LLD (0/0)

Fish-Other Ag-110m 12 - (0/12) - - <LLD (0/0)

(pCi/g wet)

Be-7 12 - (0/12) - - <LLD (0/0)

Co-58 12 0.13 (0/12) - - <LLD (0/0)

Co-60 12 0.13 (0/12) - - <LLD (0/0)

Cr-51 12 - (0/12) - - <LLD (0/0)

Cs-134 12 0.13 (0/12) - - <LLD (0/0)

Cs-137 12 0.15 (0/12) - - <LLD (0/0)

Fe-59 12 0.26 (0/12) - - <LLD (0/0) 1-131 12 - (0/12) - - <LLD (0/0)

K-40 12 - 3.18 (12/12) 40-X 3.52 (4/4) (0/0)

(1.A8-4.22) (2.9-4.03)

Mn-54 12 0.13 (0/12) - - <LLD (0/0)

Nb-95 12 - (0/12) - - <LLD (0/0)

Ru-103 12 - (0/12) - - <LLD (0/0)

Ru-106 12 - (0/12) - - <LLD (0/0)

Sb-125 12 - (0/12) - - <LLD (0/0)

Th-228 12 - (0/12) - - <LLD (0/0)

Zn-65 12 0.26 (0/12) - - <LLD (0/0)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 13 of 16 DOCKETS 50-245,50-336 & 50-339 Analysis Type Total j*

LLD Indicator Locations Mean Location with IHighest Mean Name Distance l Mean I No Range I Directioni Range Fish-Other Zr-95 12 - (0/12) <LLD (0/0)

(pCi/g wet)

Mussels Ag-110m 8 - (0/8) <LLD (0/0)

(pCi'g wet)

Be-7 8 - (0/8) <LLD (0/0)

Co-58 8 0.13 (0/8) <LLD (0/0)

Co-60 8 0.13 (0/8) <LLD (0/0)

Cr-51 8 - (0/8) <LLD (0/0)

Cs-134 8 0.13 (0/8) <LLD (0/0)

Cs-137 8 0.15 (0/8) <LLD (0/0)

Fe-59 8 0.26 (0/8) <LLD (0/0) 1-131 8 - (0/8) <LLD (0/0)

K-40 8 - 1.76 (8/8) 30 1.5 mi 1.79 (4/4) (0/0)

(1.39-2.03) NNW (1.51-2.03)

Mn-54 8 0.13 (0/8) <LLD (0/0)

Nb-95 8 - (0/8) <LLD (0/0)

Ru-103 8 - (0/8) <LLD (0/0)

Ru-106 8 - (0/8) <LLD (0/0)

Sb-125 8 - (0/8) <LLD (0/0)

Th-228 8 - (0/8) <LLD (0/0)

Zn-65 8 0.26 (0/8) <LLD (0/0)

Zr-95 8 - (0/8) <LLD (0/0)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 14 of 16 DOCKETS 50-245, 50-336 & 50-339 Indicator Location with IHighest Mean Control Non-Locations Locations Routine Mean Name Distance Mean Mean Measure-Range IDirection Range Range ments Oysters Ag-110m 23 - 0.082 (6/19) 40-X 0.091 (4/4) (0/4)

(pCi/g wet) (0.042-0.136) (0.057-0.136)

Be-7 23 (0/19) <LLD (0/4)

Co-58 23 0.13 (0/19) <LLD (0/4)

Co-60 23 0.13 (0/19) < LLD (0/4)

Cr-51 23 - (0/19) <LLD (0/4)

Cs-134 23 0.13 (0/19) <LLD (0/4)

Cs-137 23 0.15 (0/19) <LLD (0/4)

Fe-59 23 0.26 (0/19) <LLD (0/4) 1-131 23 - (0/19) <LLD (0/4)

K-40 23 - 1.71 (19/19) 32 2.01 (4/4) 1.73 (4/4)

(1.29-2.94) (1.37-2.94) (1.63-1.87)

Mn-54 23 0.13 (0/19) <LLD (0/4)

Nb-95 23 - (0/19) <LLD (0/4)

Ru-103 23 - (0/19) <LLD (0/4)

Ru-106 23 - (0/19) <LLD (0/4)

Sb-125 23 - (0/19) <LLD (0/4)

Th-228 23 - (0/19) <LLD (0/4)

Zn-65 23 0.26 (0/19) <LLD (0/4)

Zr-95 23 - (0/19) <LLD (0/4)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 15 of 16 DOCKETS 50-245, 50-336 & 50-339 Indicator Locations I

Mean Range Clams Ag-11mO 16 - (0/16) <LLD (0/0)

(pCilg wet)

Be-7 16 - (0/16) <LLD (0/0)

Co-58 16 0.13 (0/16) <LLD (0/0)

Co-60 16 0.13 (0/16) <LLD (0/0)

Cr-51 16 - (0/16) <LLD (0/0)

Cs-134 16 0.13 (0/16) <LLD (0/0)

Cs-137 16 0.15 (0/16) <LLD (0/0)

Fe-59 16 0.26 (0/16) <LLD (0/0) 1-131 16 - (0/16) <LLD (0/0)

K-40 16 - 1.76(16/16) 29 0.4 mi 1.89(4/4) (0/0)

(1.28-2.22) NNE (1.52-2.22)

Mn-54 16 0.13 (0/16) <LLD (0/0)

Nb-95 16 - (0/16) <LLD (0/0)

Ru-103 16 - (0/16) <LLD (0/0)

Ru-106 16 - (0/16) <LLD (0/0)

Sb-125 16 - (0/16) <LLD (0/0)

Th-228 16 - (0/16) <LLD (0/0)

Zn-65 16 0.26 (0/16) <LLD (0/0)

Zr-95 16 - (0/16) <LLD (0/0)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Page 16 of 16 DOCKETS 50-245, 50-336 & 50-339 Analysis Indicator Location with Highest Mean

  • Locations Type Total LLD Mean Name l Distance l Mean I No Range I Directions Range Lobsters (Crabs) Ag-11 Om 12 (0/12) <LLD (0/0)

(pCi/g wet)

Be-7 12 - (0/12) <LLD (0/0)

Co-58 12 0.13 (0/12) <LLD (0/0)

Co-60 12 0.13 (0/12) <LLD (0/0)

Cr-5 I 12 - (0/12) <LLD (0/0)

Cs-134 12 0.13 (0/12) < LLD (0/0)

Cs-137 12 0.15 (0/12) <LLD (0/0)

Fe-59 12 0.26 (0J12) <LLD (0/0) 1-131 12 - (0/12) <LLD (0/0)

K40 12 - 2.05 (12/12) 37-X 3.5 mi 2.17 (4/4) (0/0)

(1.42-2.45) WSW (2-2.31)

Mn-54 12 0.13 (0/12) <LLD (0/0)

Nb-95 12 - (0/12) <LLD (0/0)

Ru-103 12 - (0/12) <LLD (0/0)

Ru-106 12 - (0/12) <LLD (0/0)

Sb-125 12 - (0/12) <LLD (0/0)

Th-228 12 - (0112) <LLD (0/0)

Zn-65 12 0.26 (0/12) <LLD (0/0)

Zr-95 12 - (0/12) <LLD (0/0)

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 NOTES FOR TABLE 3-1

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

LLD / 2.33. For all others, MDL = 2 x (the standard deviation of the background). These MDL's are based on the absence of large amounts of interfering activity (excluding naturally occurring radionuclides). Deviations by about factors of 3 to 4 can occur.

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 (-IAt) 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)

X, is the radioactive decay constant for the particular radionuclide At is the elapsed time between sample collection (or end of the sample collection period) and time of counting The LLD is a defined 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 (e.g., seawater), the LLD is decayed to the end of the sample period (especially important for I-131, Ba-140 and La-140).

The listed value for I-131 in Fruits and Vegetables is only applicable for leafy vegetables.

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 3.2. Data Tables The data reported in this section are strictly counting statistics.

The reported error is two times the standard deviation (2a) of the net activity. Unless otherwise noted, the overall error (counting, sample size, chemistry, errors, etc.) is estimated to be 2 to 5 times that listed. Results are considered positive when the measured value exceeds 1.5 times the listed 2a error (i.e., the measured value exceeds 3a).

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 is recommended by HASL ("Reporting of Analytical Results from HASL," letter by Leo B. Higginbotham) 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 (numbers listed below correspond to Table number) as indicated below.

1. Gamma Exposure Rate
2. Air Particulates, Gross Beta Radioactivity
3. Air Particulates, Weekly I-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 1O.Well Water 111.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.

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 1, Quarterly TLD Gamma Exposure Rate (uR/hr) Page I of 2 Location First Second Third Fourth Average I Number Quarter Quarter Quarter Quarter 4 2 s.d.

01 8.74 +/-0.33

  • 8.90 +/- 0.23 8.34 i 0.24 8.66 +/- 0.47 02 10.33 +/- 0.27 10.83 +/- 0.30 9.81 +/- 0.25 10.32 +/- 0.83 03 7.55 +/- 0.49 6.91 +/- 0.24 6.33 +/- 0.23 6.93 +/- 1.00 04 8.79 +/- 0.32 8.94 +/- 0.28 7.71
  • 0.21 8.48 +/- 1.10 05 9.49 + 0.40 10.22 +/- 0.31 9.03 +/- 0.26 9.58
  • 0.98 06 8.87 i 0.28 8.98 +/- 0.40 8.18 +/- 0.35 8.68 0.71 07 5.88 0.20 5.39 +/- 0.15 4.41 +/- 0.30 5.23
  • 1.22 08 11.96 i 0.48 12.72 +/- 0.34 11.30 +/- 0.54 11.99
  • 1.16 09 9.62 i 0.22 10.14 +/- 0.47 9.12 t0.22 9.63
  • 0.83 10 8.62 +/- 0.19 8.98 +/- 0.39 8.34 +/- 0.38 8.65
  • 0.52 11 7.39 +/- 0.18 7.65 +/- 0.27 7.18 +/- 0.24 7.41 0.38 12-C 7.73 +/- 0.33 8.17 +/- 0.39 7.67 +/- 0.44 7.86 i 0.45 13-C 8.93 +/- 0.39 9.09 +/- 0.27 8.14 +/- 0.40 8.72
  • 0.83 14-C 9.60 +/- 0.31 10.38 +/- 0.37 9.55 +/- 0.37 9.84
  • 0.76 15-C 7.99 t 0.19 8.74 +/- 0.44 7.69 +/- 0.51 8.14
  • 0.88 16-C 6.84 i 0.91 7.25 +/- 0.33 5.52 +/- 0.23 6.54 1.48 27 9.40 +/- 0.22 9.78 +/- 0.35 8.67 +/- 0.35 9.28 0.92 41 7.10+/-0.43 7.69 +/- 0.46 6.41 0.19 7.07
  • 1.05 42 8.18 +/-0.24 8.75 +/- 0.22 7.46 +/- 0.37 8.13
  • 1.06 43 6.80 +/- 0.26 7.50 + 0.21 6.38 +/- 0.23 6.89
  • 0.92 44 9.09 +/- 0.60 10.32 +/- 0.44 8.29 +/- 0.28 9.23
  • 1.67 45 7.40 +/- 0.25 8.03 +/- 0.20 6.82+/-0.19 7.42
  • 0.99 46 8.02 0.42 8.40 +/- 0.23 7.62 +/- 0.38 8.01 0.64 47 7.62 + 0.21 8.64+/-0.30 7.46 + 0.26 7.91
  • 1.05 48 9.90 i 0.32 10.43 +/- 0.63 9.37 +/- 0.37 9.90 +/- 0.87 49 7.33 + 0.24 8.20 +/- 0.20 6.75 +/- 0.34 7.43
  • 1.19 50 7.72 i 0.18 8.61 +/- 0.31 7.10 +/- 0.18 7.81
  • 1.24 51 6.46 + 0.39 7.16 +/- 0.43 5.50 +/- 0.17 6.37 1.36 52 7.24 0.36 7.82 +/- 0.22 6.86 +/- 0.40 7.31
  • 0.79 53 8.11 0.27 8.67 +/- 0.29 7.42 +/- 0.28 8.07 1.02 55 7.99 i 0.27 7.98 +/- 0.23 7.15 +/- 0.17 7.71
  • 0.79 56 7.30 + 0.42 7.13 +/- 0.23 6.39 +/- 0.48 6.94
  • 0.79 57 7.62 + 0.31 8.06 +/- 0.31 6.90 +/- 0.24 7.53 + 0.96 59 7.83 + 0.27 9.10 +/- 0.24 7.83 +/- 0.39 8.25
  • 1.20 60 8.16 +/- 0.49 8.09 + 0.22 7.13 +/- 0.34 7.79 +/- 0.94 61 7.82 +/-0.18 8.27 +/- 0.32 7.42 0.34 7.84 +/- 0.69 62 8.12 0.23 8.92 +/- 0.30 7.98 +/- 0.43 8.34 +/- 0.83 63 9.43 i 0.38 9.65 +/- 0.35 9.13*0.30 9.40 +/- 0.43 64 7.91 +/- 0.26 7.99 +/- 0.26 7.41 +/- 0.23 7.77 4 0.51 65 7.74 +/- 0.48 8.20 +/- 0.23 7.27 +/- 0.26 7.74 +/- 0.76 66-X 7.56 +/- 0.24 7.42 +/- 0.23 6.47 +/- 0.20 7.15
  • 0.97 73-X 10.10* 0.46 9.88 +/- 0.23 9.26 +/- 0.34 9.75 +/- 0.71

Dominion Nudear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 1, Quarterly TLD Gamma Exposure Rate (uR/hr) Page 2 of 2 Location First Second Third Fourth Average I Number Quarter Quarter Quarter Quarter 4 2 s.d.

74-X 7.42 i 0.25 8.24 +/- 0.24 7.54 +/- 0.19 7.73 + 0.72 75-X 7.03 +/- 0.30 7.37 +/- 0.35 6.83 +/- 0.29 7.08 +/- 0.45

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 2, Air Particulate Gross Beta Radioactivity (pCi/m3 x 1000) Page I of 4 Collection Locations Date JANUARY 01 02 03 04 10 11 12/29 - 01/04 31.9*4.0 33.3 +/-4.2 33.4

  • 4.3 33.9
  • 3.7 35.3 +4.1 37.1 *4.1 01/05 - 01/11 25.3 3.6 24.1
  • 3.7 26.4 4 3.9 21.4 +/- 3.1 22.7 + 3.4 23.9
  • 3.6 01/12 - 01/18 20.2
  • 4.0 19.3 +/-4.2 16.6
  • 4.2 16.1
  • 3.4 16.7 +/- 3.7 18.0* 3.9 01/19 - 01/25 22.3
  • 3.6 17.0
  • 3.6 20.0
  • 3.9 21.6 +/- 3.4 20.7 + 3.6 17.7 +/- 3.7 FEBRUARY 01 02 03 04 10 11 01/26 - 02/01 16.1
  • 3.4 16.1 + 3.6 19.9
  • 3.9 18.4 +/- 3.2 19.0
  • 3.5 20.8
  • 3.7 02/02 - 02/08 11.9 +/- 4.3 16.8 +/- 7.7 15.0 *4.8 13.9
  • 3.9 13.4
  • 4.2 14.4 +/- 4.4 02/09 - 02/15 31.8*4.4 27.6 +/- 4.5 34.6
  • 4.8 26.8
  • 3.8 31.5 +/- 4.5 34.2
  • 4.5 02/16 - 02/22 28.9 +/- 3.7 26.9
  • 3.9 29.7
  • 4.0 31.8* 3.5 31.9
  • 4.0 32.1
  • 3.9 02/23 - 02/29 24.4 +/- 4.3 25.5 +/- 4.6 25.8
  • 4.7 25.4
  • 3.8 25.2
  • 4.5 21.8 +/- 4.3 MARCH 01 02 03 04 10 11 03/01 - 03/07 16.9* 3.5 16.1 *3.7 16.7
  • 3.7 16.7
  • 3.1 17.8
  • 3.7 15.6 +/- 3.5 03/08 - 03/14 18.9 3.4 16.0 + 3.5 17.2 +/- 3.5 15.5 +/- 2.8 19.0 +/- 3.4 16.7 +/- 3.3 03/15 - 03/21 20.7
  • 3.9 14.4 +/- 3.6 17.1 +/- 3.7 17.0 +/- 3.0 16.5
  • 3.5 19.0
  • 3.6 03/22 - 03/28 18.0 4.1 18.8 +/-4.3 21.0 +/-4.4 23.3 +/- 3.7 23.4
  • 4.2 24.9
  • 4.3 Qtr Avg 4 2 sd 22.1 +/- 11.8 20.9 +/- 11.3 22.6
  • 12.9 21.7:k 12.2 22.5
  • 12.9 22.8
  • 14.2 JANUARY 15-C 27 12/29 - 01/04 35.0
  • 4.4 33.9 + 4.3 01105 - 01/11 25.6
  • 3.9 23.1
  • 3.8 01/12 - 01/18 16.3
  • 4.3 18.4
  • 4.2 01/19 - 01/25 21.7 +/- 4.1 20.8
  • 4.1 FEBRUARY 15-C 27 01/26 - 02/01 19.4 3.9 19.6
  • 3.9 02/02 - 02/08 17.2 4.9 14.1
  • 4.8 02/09 - 02/15 34.0
  • 5.0 33.5 :E 4.8 02/16 - 02/22 27.0 + 4.0 32.2 : 4.2 02/23 - 02/29 21.0k*4.6 25.7
  • 4.9 MARCH 15-C 27 03/01 - 03/07 18.3
  • 4.0 19.0E*4.1 03/08 - 03/14 17.5 +/- 3.7 19.4 *3.8 03/15 - 03/21 18.0* 3.9 19.2 + 4.1 03/2 - 03/28 22.5
  • 4.6 25.3 + 4.8 QtrAvg*2 sd 22.6
  • 11.9 23.4
  • 12.2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 2, Air Particulate Gross Beta Radioactivity (pCi/m3 x 1000) Page 2 of4 Collection Locations Date APRIL 01 02 03 04 10 11 03/29 - 04/04 8.4+/-3.0 7.6*3.1 8.5

  • 3.1 8.9
  • 2.6 7.7+/- 3.0 6.8
  • 2.8 04105 - 04/11 16.3*3.6 17.5*4.0 14.3
  • 3.8 17.6*3.3 13.9 +/- 3.6 16.2 :L 3.7 04/12 - 04/18 17.9+/- 3.5 19.1 :* 3.4 20.3 +/- 3.4 21.1
  • 3.1 19.3 +/- 3.3 27.2 +/- 5.9 A 04/19 - 04/25 17.0
  • 3.6 14.3*2.9 17.5 +/- 3.1 15.8
  • 3.0 17.4 +/- 3.0 15.4 +/- 2.9 MAY 01 02 03 04 10 11 04/26 - 05/02 17.1 +/-*4.3 17.7
  • 3.5 17.4 +/- 3.6 16.9
  • 3.6 15.4 +/- 3.4 17.7 +/- 3.6 05/03 - 05/09 19.3 +/- 4.0 20.8
  • 3.3 21.3 +/- 4.3 23.2
  • 3.5 21.4 +/- 3.3 22.9 +/- 3.4 05/10 - 05/16 22.4*4.1 18.2
  • 3.2 22.0
  • 3.4 23.8
  • 3.5 25.1 *3.4 27.2 +/- 3.5 05/17 - 05/23 21.1 *4.2 17.2 +/- 3.2 19.6 +/- 4.1 19.9 +/- 3.4 20.3
  • 3.3 19.6 +/-4.1 05/24 - 05/30 12.8+/-4.9 12.1
  • 3.8 11.6 +/- 3.9 15.0
  • 4.0 12.9 +/- 3.8 12.0 +/- 3.8 JUNE 01 02 03 04 10 11 05/31 - 06/06 9.1
  • 3.9 9.6 +/- 3.1 12.3
  • 3.4 11.2 +/- 3.3 10.4
  • 3.1 10.2 + 3.1 06/07 - 06/13 19.1 *4.0 14.3
  • 3.1 16.4 +/- 3.3 15.2 +/- 3.2 14.7+ 3.1 16.7 +/- 3.2 06/14 - 06/20 15.4 +/- 4.5 14.1
  • 3.6 17.3 +/- 3.9 14.3 +/- 3.7 16.0 +/- 3.6 15.2k *3.6 06/21 - 06/27 23.8
  • 4.0 17.6
  • 3.1 20.8
  • 3.3 18.2 : 3.2 22.1 *3.3 23.2
  • 3.3 Qtr Avg 42 sd 16.9 +/- 8.9 15.4 4 7A 16.9 +/- 8.0 17.0 +/- 8.4 16.7 +/- 9.5 17.7* 11.9 APRIL 15-C 27 03/29 - 04/04 8.8 +/- 3.3 8.1 +/- 3.4 04/05 - 04111 19.5
  • 4.3 19.6
  • 4.4 04/12 - 04/18 21.6* 3.4 20.7
  • 3.4 04/19 - 04/25 14.6 +/- 2.8 15.7
  • 2.9 MAY 15-C 27 04/26 - 05102 17.1
  • 3.4 18.7 +/- 3.7 05/03 - 05/09 21.7 +/- 3.3 24.1
  • 3.6 05110 - 05/16 24.5
  • 3.4 24.5
  • 3.6 05/17 - 05/23 18.8 +/- 3.2 16.3
  • 3.3 05/24 - 05/30 13.8
  • 3.8 15.4
  • 4.1 JUNE 15-C 27 05/31 - 06/06 11.1 *3.1 11.2
  • 3.3 06/07 - 06/13 16.8 +/- 3.1 16.0k *3.3 06/14 - 06/20 19.0 +/- 3.8 15.7 + 3.9 06/21 - 06/27 22.6 +/- 3.1 18.4
  • 3.3 QtrAvg*2 sd 17.7 +/- 8.9 17.3 +/- 8.8

Dominion Nudear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 2, Air Particulate Gross Beta Radioactivity (pCi/m3 x 1000) Page 3 of 4 Collection Locations Date JULY 01 02 03 04 10 11 06128 - 07/04 17.1 +/-3.7 16.4+/-3.0 15.5 +/- 3.1 18.2 +/- 3.1 19.5

  • 3.1 23.1
  • 6.0 B 07/05 - 07/11 9.9+/-4.1 9.9+/-3.2 10.0 +/- 3.4 8.7 +/- 3.3 7.4 +/- 3.3 11.8k*3.4 07/12 - 07/18 10.9:t3.5 11.0+/-2.8 -8.0
  • 78.0 C 10.2 +/- 2.8 12.1 *2.8 13.2 +/- 2.9 07/19 - 07/25 21.5+/-3.2 16.6 +/- 3.1 21.0+/- 3.7 19.4 +/- 3.2 18.5
  • 3.1 20.9 +/- 3.3 AUGUST 01 02 03 04 10 11 07/26 - 08/01 8.0 +/- 3.2 12.2 4 3.6 10.3 +/- 3.6 10.4 +/- 3.4 10.2+/- 3.4 8.7 +/- 3.4 08/02 - 08/08 16.3 : 3.6 14.6 +/-:3.6 15.8 +/- 3.8 17.8 +/- 3.8 13.9 +/- 3.6 15.0 +/- 3.8 08/09 - 08/15 12.1 +/-3.2 14.3 :k 3.3 15.8:t 3.5 12.0 +/- 3.4 15.0 +/- 3.5 13.1 +/- 3.5 08/16 - 08/22 23.7 +/- 3.5 22.4
  • 3.7 23.3 +/- 3.7 21.9 +/- 3.5 24.5 +/- 3.6 25.0 +/- 3.7 08/23 - 08/29 14.9 3.7 16.2 +/- 3.9 19.5 +/- 4.2 17.5 +/- 4.0 15.8+/- 3.9 19.4 +/-4.2 SEPTEMBER 01 02 03 04 10 11 08/30- 09/05 16.2 +/- 3.9 14.1 4 3.9 16.8 +/- 4.1 15.1 +/-4.0 13.7 + 4.0 16.1 +/-4.1 09/06 - 09/12 14.9 +/- 4.0 15.5 4 3.9 14.6i+/-4.2 11.2 +/- 4.0 13.7 + 4.1 16.7 +/- 4.4 09/13 - 09/19 9.9 3.2 11.2 + 3.4 8.3 +/- 3.4 10.1 +/- 3.3 10.4 +/- 3.5 10.0 +/- 3.4 09120 - 0926 30.6 4.0 29.6 +/- 4.1 31.1 +/- 4.3 27.9 +/- 4.1 32.4 +/- 4.4 32.4 +/- 4.3 Qtr Avg 4 2 sd 15.8+/- 12.2 15.7+/- 10.1 16.8 +/- 12.1 15.4+/- 10.9 15.9 +/- 12.8 17.3 +/- 12.9 JULY 15-C 27 06/28 - 07/04 21.0 +/- 3.2 18.3 + 3.2 07/05 - 07/11 9.8 3.3 10.2 + 3.5 07/12 - 07/18 10.5 2.7 13.8+/- 3.0 07/19 - 07/25 18.6 3.2 20.5 +/- 3.3 AUGUST 15-C 27 07/26 - 08/01 11.7 + 3.7 12.5 +/-4.4 08/02 - 08/08 14.7i +/-3.8 13.6 +/- 3.4 08/09 - 08/15 16.7 +/- 3.7 15.1 +/- 3.9 08/16 - 08/22 25.8 +/- 3.9 24.2 +/- 3.9 08/23 - 08129 20.7* 4.5 17.0 +/-:4.3 SEPTEMBER 15-C 27 08/30 - 09/05 19.5+/-4.3 17.4+/- 4.4 09/06 - 09/12 15.3 +/- 4.3 13.1 +/- 4.5 09/13 - 09/19 11.6:t 3.8 10.6 +/- 3.7 09/20 - 09/26 34.5 + 4.6 33.3 +/- 4.6 QtrAvg42 sd 17.7+/- 13.3 16.9:+/- 12.1

Dominion Nuclear Connectcut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 2, Air Particulate Gross Beta Radioactivity (pCi/m3 x 1000) Page 4 of 4 Collection Locations Date OCTOBER 01 02 03 04 10 11 09/27- 10/03 17.3+/-3.7 16.3+3.7 20.9

  • 4.0 19.2
  • 3.9 17.7* 3.9 18.6 *4.0 10104- 10/10 23.0+/- 3.4 25.1
  • 3.4 22.1
  • 3.5 23.6
  • 3.4 25.2
  • 3.6 28.8
  • 3.7 10/11 - 10/17 17.7*3.7 16.5+/-3.7 14.8
  • 3.9 13.9
  • 3.8 14.0 +/- 4.0 14.0 *:3.9 10/18- 10/24 10.6+/-2.5 11.6*2.6 9.9
  • 2.7 10.9
  • 2.6 11.6
  • 2.7 12.4
  • 2.8 10/25 - 10/31 17.8*3.6 17.1 *3.6 20.8 *4.0 20.1
  • 3.7 19.0+/- 4.0 16.0
  • 3.8 NOVEMBER 01 02 03 04 10 11 11/01 - 11/07 17.1
  • 3.3 16.0
  • 3.3 15.5
  • 3.2 15.8
  • 3.7 11.5
  • 3.1 16.3
  • 3.3 11/08 - 11/14 20.8
  • 3.8 17.9
  • 3.8 19.5 : 3.8 22.8
  • 3.8 19.7 +/- 3.9 21.6
  • 4.0 11(15 - 11/21 35.8 +/- 6.3 31.8
  • 6.2 30.4 4 6.0 34.4
  • 5.9 33.5 +/- 6.4 34.6
  • 6.3 11/22- 11/28 13.3:+3.7 15.0 +/-4.0 16.3
  • 3.9 17.9
  • 3.7 18.4 +/- 4.2 16.2
  • 4.0 DECEMBER 02 03 04 10 11 01 11/29- 12/05 20.8
  • 4.0 20.2 + 4.2 20.0 + 4.1 22.3
  • 4.0 22.2
  • 4.4 19.9
  • 4.2 12/06- 12/12 10.2 +/- 3.0 11.2
  • 3.2 12.1 +3.1 10.8* 8.5 D 11.3 :* 3.2 10.3
  • 3.1 12/13 - 12/19 23.7
  • 3.9 24.1 *4.0 24.8 +/-4.1 27.6 + 4.0 22.9
  • 4.1 19.8:t 3.9 12/20- 12/26 22.3
  • 4.0 23.6
  • 4.2 21.7 + 4.2 16.8 +/- 3.5 22.5
  • 3.7 17.6 +/- 3.9 Qtr Avg* 2 sd 19.3 +/- 12.7 19.0* 11.2 19.1
  • 10.5 20.4* 12.1 19.2* 12.2 18.9
  • 12.6 Ann Avg + 2 sd 18.5* 12.5 17.7:* 11.1 18.9+/- 12.0 18.6+/- 12.1 18.6* 13.0 19.2*+/- 13.6 OCTOBER 15-C 27 09/27- 10/03 16.6 +/- 4.0 16.8:k 4.1 10/04 - 10/10 24.1
  • 3.7 26.6
  • 3.9 10/11 - 10/17 15.5 : 4.3 17.9 +/- 4.5 10/18 - 10/24 11.1
  • 2.9 11.3
  • 3.0 10125 - 10/31 19.0+/- 4.2 15.9k*4.2 NOVEMBER 15-C 27 11/01 - 11/07 12.9 +/- 3.4 13.8 +/- 3.5 11/08 - 11/14 20.6 +/- 4.2 18.8
  • 4.2 11/15 - 11/21 32.4
  • 6.6 32.1 + 6.6 11/22- 11/28 17.6 +/- 4.4 17.6k*4.4 DECEMBER 15-C 27 11/29 - 12/05 24.7
  • 4.8 22.9
  • 4.7 12/06- 12/12 7.1 +/- 3.3 12.9
  • 3.6 12/13 - 12/19 24.2
  • 4.4 24.1 *4.5 12/20- 12126 19.3
  • 4.2 19.2 +4.3 Qtr Avg 4 2 sd 18.9* 12.8 19.2* 11.2 Ann Avg 42 sd 19.2* 12.5 19.2* 12.3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 3, Airborne Iodine 1-131 (pCi/m3 x 1000) Page 1 of 4 Collection Locations Date JANUARY 01 02 03 04 10 11 12/29 - 01/04 3+/-20 # 4:*23 -1*I 23 20 + 20 -17 +/- 20 9*24 01/05 - 01/11 -1 26 -12 4 29 -8 +/- 25 -30*22 2+/-24 -7 *24 01/12 - 01/18 I +/- 16 -1

  • 17 -15* 16 -4* 13 3 +/- 16 -11
  • 14 01/19 - 01/25 -14* 16 3*+/-31 17+30 -18+/-25 -25
  • 27 20
  • 30 FEBRUARY 01 02 03 04 10 11 01/26 - 02/01 3
  • 20 8*22 14*22 20*21 -5* 18 -12* 22 02/02 - 02108 -3
  • 18 14* 38 1 + 25 -9
  • 17 -16* 16 -1
  • 18 02/09 - 02/15 8*26 -5*27 -3 *30 6*23 -13 +/- 23 2*24 02/16 - 02/22 -6
  • 26 2
  • 25 -23
  • 25 -2
  • 16 -9
  • 23 -15* 22 02/23 - 02/29 -6
  • 18 14
  • 20 -11
  • 16 3
  • 14 -2* 13 -2* 20 MARCH 01 02 03 04 10 11 03/01 - 03/07 -11 *21 -12* 22 -6
  • 17 8
  • 14 6
  • 19 -4* 18 03/08 - 03/14 -14* 23 -15* 24 3*27 -6*20 -10* 17 22
  • 17 03/15 - 03/21 13
  • 22 3*22 22
  • 23 -15+ 18 4*22 6*21 03/22 - 03/28 6
  • 20 1
  • 28 26L *37 27 +/- 27 3*31 -32
  • 30 JANUARY 15-C 27 12/29 - 01/04 -12 *29 5+26 01/05 - 01/11 6+/-*31 18k*28 01/12 - 01/18 8
  • 12 -7
  • 11 01/19 - 01/25 27 *30 -10
  • 34 FEBRUARY 15-C 27 01/26 - 02/01 16*24 -11
  • 19 02/02 - 02/08 8*23 8*+/-22 02/09 - 02/15 25 +/- 29 -2
  • 31 02/16 - 02/22 9+/-*21 -3+/-28 02/23 - 02/29 2
  • 20 16 +/-21 MARCH 15-C 27 03/01 - 03/07 -6*23 -16* 27 03/08 - 03/14 -16* 17 -12
  • 21 03/15 - 03/21 -4*21 -4*23 03/22 - 03/28 41 +/- 33 3*t20

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 3, Airborne Iodine 1-131 (pCi/m3 x 1000) Page 2 of 4 Collection Locations Date APRIL 01 02 03 04 10 11 03/29 - 04/04 5*23 18*25 10 + 23 -3* 20 14*25 4*23 04/05 - 04/11 10 +/- 28 13 : 22 -1

  • 21 13 +/- 19 20*23 20
  • 23 04/12 - 04/18 -14 + 21 -7 +/- 20 9
  • 17 15 +/- 16 8
  • 17 25:*25 A 04/19 - 04/25 -4 +/- 19 5 +/- 15 3:t14 -3* 14 2
  • 17 -2
  • 15 MAY 01 02 03 04 10 11 0426 - 05/02 14* 21 0
  • 19 -4* 17 3
  • 18 -9* 16 -6* 17 05/03 - 05/09 14* 31 6*+/-23 0* 18 -2
  • 21 16*25 4*22 05110 - 05/16 8 +/- 15 6
  • 15 0
  • 17 -10
  • 16 0*15 0
  • 12 05/17 - 05/23 12*23 -6
  • 21 2*22 -15
  • 17 -2
  • 4 E 2*20 05/24 - 05/30 -5 +/-28 6*21 -3
  • 19 16*+/-22 -18 +/-20 17* 19 JUNE 01 02 03 04 10 11 05/31 - 06/06 -12* 23 12
  • 17 -10* 16 11
  • 14 3* 11 -8
  • 17 06/07 - 06/13 3*+/-28 -2
  • 25 1
  • 20 -4*22 -6 *21 1
  • 24 06/14 - 06/20 -10
  • 23 2 + 19 0*+17 -3+/- 19 6* 16 -6
  • 16 06/21 - 06/27 -11 *24 -6 +/- 21 -12
  • 20 -1
  • 16 -3
  • 16 -21
  • 17 APRIL 15-C 27 03/29 - 04/04 29
  • 28 0*26 04/05 - 04/11 -10* 19 3*22 04/12 - 04/18 -18* 17 3*20 04/19 - 04/25 5
  • 14 7
  • 17 MAY 15-C 27 04/26 - 05/02 I
  • 16 -9
  • 18 05/03 - 05/09 -8
  • 21 19*26 05110 - 05/16 3
  • 16 2
  • 17 05/17 - 05/23 0* 19 -11
  • 16 05/24 - 05/30 I
  • 18 21
  • 28 JUNE 15-C 27 05/31 - 06/06 10* 14 6
  • 19 06/07 - 06113 9*20 -7*20 06/14 - 06120 13
  • 15 14 +/- 20 06/21 - 06/27 11 *20 -3
  • 17

Dominion Nudear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 3, Airborne Iodine I-131 (pCi/m3 x 1000) Page 3 of4 Collection Locations Date JULY 01 02 03 04 10 11 06/28 - 07/04 19*34 -15+/-21 -17: 25 -14 +/-21 17* 27 10*26 B 07/05 - 07/11 -6

  • 17 5 +/- 14 10* 13 8* 19 0* 15 3* 15 07/12 - 07/18 -7+/-28 -14* 18 10*740 C -3 + 18 -10* 25 0*27 07/19 - 07/25 3*+/-17 5 +/- 14 0
  • 18 3+/-17 -20* 14 3*16 AUGUST 01 02 03 04 10 11 07/26 - 08/01 0*+14 8 +/- 15 -2
  • 13 -6* 14 -6* 13 9
  • 15 08/02 - 08/08 4 +/- 16 7+/- 18 15* 19 7* 16 -3
  • 14 23 + 19 08/09 - 08/15 -16* 15 -2 +/- 17 -6
  • 18 11*21 -9
  • 18 -13
  • 19 08/16 - 08/22 -10* 15 -7 +/- 19 -18 +/-20 -7 *22 11i 17 -12
  • 17 08/23 - 08/29 19*22 -6+/-20 12
  • 17 15
  • 20 -8
  • 18 -9 +/- 22 SEPTEMBER 01 02 03 04 10 11 08/30 - 09/05 -17* 16 3* 16 0* 14 5* 15 5* 16 11 i18 09/06 - 09/12 -12
  • 19 -6 +/- 19 27
  • 23 -11
  • 18 12* 18 -8
  • 18 09/13 - 09/19 3 +/- 15 -7
  • 18 -4* 16 -21
  • 19 -7* 18 -16* 16 09/20 - 09/26 1
  • 13 8+ 17 -5 + 18 -2* 15 0* 17 -10* 17 JULY 15-C 27 06/28 - 07/04 -8* 21 -1
  • 24 07/05 - 07/11 -9+ 15 7
  • 18 07/12 - 07/18 -7*23 5*27 07/19 - 07/25 -7
  • 15 2
  • 16 AUGUST 15-C 27 07/26 - 08/01 6* 14 -22
  • 20 08/02 - 08/08 -5*20 1
  • 17 08/09 - 08/15 -4* 19 -2* 15 08/16 - 08/22 6
  • 21 -6* 19 08/23 - 08/29 10* 21 -14* 19 SEPTEMBER 15-C 27 08/30 - 09/05 10* 14 -10* 20 09/06 - 09/12 2*20 9 + 24 09/13 - 09/19 -13*22 1 +21 09/20 - 09/26 2
  • 17 -15* 17

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 3, Airborne Iodine 1-131 (pCi/m3 x 1000) Page 4 of 4 Collection Locations Date OCTOBER 01 02 03 04 10 11 09/27- 10/03 -3 +/- 19 -4 21 20+/-23 9

  • 22 -22* 17 5*26 10/04- 10/10 -9*26 -9 +/- 21 0 +/- 27 -27
  • 24 -11 25 -4
  • 24 10111 - 10/17 -35 +/- 29 -9
  • 33 12 +/- 26 6*26 14
  • 27 -7
  • 26 10/18- 10/24 9* 21 13 +/-21 7* 18 2
  • 21 23
  • 20 -1
  • 18 10/25 - 10/31 -2 +/- 19 -9*21 21
  • 21 -2
  • 18 -10 + 22 6 +/- 22 NOVEMBER 01 02 03 04 10 11 11/01 - 11/07 12
  • 21 13
  • 20 -3
  • 20 13*24 5 +/- 18 4* 23 11/08 - 11/14 0*21 0
  • 21 -5*23 -8 *22 17*25 16*22 11/15 - 11/21 -3
  • 17 -2
  • 18 8* 17 2 +/- 17 -14
  • 18 0
  • 19 11/22- 11/28 -1
  • 24 -19* 22 8
  • 23 -4 19 -3* 19 -16
  • 24 DECEMBER 01 02 03 04 10 11 11/29 - 12/05 6* 15 -9* 18 7* 17 -16* 17 -7*20 12
  • 18 12/06- 12/12 -7*25 2
  • 26 -9
  • 24 3+/-38 D 0*22 5
  • 30 12/13 - 12/19 18* 19 -17* 15 7* 12 6
  • 16 -6 +/- 17 -9* 15 12/20- 12/26 -4* 18 -1
  • 21 4
  • 20 -3 +/- 15 9*17 2*20 OCTOBER 15-C 27 09/27- 10/03 -2*23 -5
  • 25 10/04 - 10/10 3*31 -11 *22 10/11 - 10/17 24 +/- 28 12*22 10/18 - 10/24 -8 +/- 24 1
  • 21 10/25 - 10/31 -12
  • 24 2+/-23 NOVEMBER 15-C 27 11/01 - 11/07 12*22 10 *20 11/08 - 11/14 1
  • 26 -8 *26 11/15 - 11/21 -1
  • 17 0* 19 11/22- 11/28 5*21 0*23 DECEMBER 15-C 27 11/29 - 12/05 0* 18 -20*1:23 12/06- 12/12 -11
  • 28 -15 +/- 27 12/13- 12/19 20*22 -6 +/- 24 12/20 - 12/26 3*20 3*21

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 4-A, Air Particulates Gamma Spectra - Quarter 1 (pCi/m3 x 1000) Page I of I Location Isotope Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 01 12.0 + 52.0 91.0 + 42.0 -2.3 + 6.8 2.2 +/- 6.0 0.0 + 2.5 0.5+/- 1.0 0.0 + 54.0 02 0.0 +/- 63.0 62.0 +/- 35.0 2.0*7.0 2.9 +/- 6.9 0.6 +/- 2.2 -0.9

  • 1.3 61.0
  • 51.0 03 51.0 +/- 51.0 104.0 + 48.0 5.9*7.1 -5.3 i 7.0 0.1 +/- 3.1 -0.4
  • 1.3 39.0
  • 59.0 04 10.0i35.0 45.0 +/- 36.0 3.1 + 6.1 -6.1 +/-4.8 -0.7* 1.7 0.4
  • 1.1 13.0
  • 52.0 10 -23.0 +/- 57.0 63.0 +/- 35.0 -0.9 + 6.7 1.8*5.9 -0.3 +/- 2.6 -1.1
  • 1.3 -10.0
  • 53.0 11 -35.0 +/- 41.0 103.0 +/- 42.0 -2.8 i 7.7 4.0 +/- 6.2 -1.0 +/- 2.4 0.1
  • 1.7 71.0* 59.0 15-C -53.0 + 65.0 118.0*43.0 2.0*7.2 -10.0 +/- 7.3 0.3 +/- 2.6 1.9
  • 1.6 17.0* 63.0 27 0.0 +/- 53.0 108.0 +/- 48.0 -1.6 + 8.0 -2.5
  • 6.8 -1.6 +/- 2.1 1.6
  • 1.6 -40.0
  • 57.0 Cs-134 Cs-137 Mn-54 Nb-95 Ru-103 Ru-106 Zr-95 01 0.8+/-1.2 -1.3 i 1.4 -1.1 + 1.3 0.5
  • 6.3 -0.5 i 3.9 -5.0
  • 13.0 -1.1
  • 4.9 02 0.8+/- 1.4 -1.1 +/- 1.4 0.3 + 1.2 -0.2
  • 6.8 0.5 +/- 5.0 15.0i 13.0 -2.1 +/-4.5 03 -0.6* 1.4 -0.1 +/- 1.2 -0.2 i 1.4 -2.0 +/- 5.2 -1.0 +/- 4.4 -3.0
  • 13.0 -0.2
  • 4.3 04 0.4
  • 1.0 -1.7 +/- 1.2 -0.2 i 1.0 2.6+/- 4.7 2.0 +/- 2.9 -1.0* 10.0 0.4 3.6 10 -0.9 +/- 1.2 -1.2 +/- 1.5 -0.1 i 1.2 -2.9* 5.8 -1.9 +/- 3.5 -2.0* 13.0 1.0 +/- 4.0 11 0.9* 1.3 -0.9i 1.0 0.1 4 1.3 -0.6 +/- 4.5 1.4 +/- 3.9 -5.0* 14.0 -0.2
  • 4.0 15-C -0.7 +/- 0.9 0.6
  • 1.2 -1.8
  • 1.5 -5.6 +/- 6.2 -0.5 +/- 3.5 2.0
  • 12.0 -2.4
  • 3.2 27 -0.1 +/- 1.3 0.4 +/- 1.2 0.7
  • 1.4 2.2 +/- 4.6 -3.2 +/- 4.2 -1.0* 16.0 2.9 +/- 2.9

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 4-B, Air Particulates Gamma Spectra - Quarter 2 (pCi/m3 x 1000) Page I of I Location Isotope Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 01 30.0 +/- 43.0 106.0 +/- 49.0 5.7 + 5.6 1.2+/- 6.9 -0.3 +/- 3.0 0.5 +/- 1.9 24.0 +/- 54.0 02 0.0 +/- 25.0 83.0 +/- 38.0 0.6+/-4.0 1.3 +/- 6.9 -0.9+/-2.3 -1.4 +/- 1.6 -17.0 +/- 40.0 03 0.0+/-38.0 104.0 +/- 47.0 4.6+/-5.1 1.4 +/- 6.4 -0.1 +/- 3.7 1.6 +/- 1.9 31.0 + 43.0 04 -6.0+/- 21.0 117.0 +/- 42.0 2.6+/-5.0 -1.2 +/- 6.3 1.2 +/- 2.2 -0.4 +/- 1.2 7.0 +/- 39.0 10 6.0+/-33.0 89.0 +/- 39.0 -2.1 +4.4 0.9+/- 5.7 -0.8 +/- 1.8 0.6+/- 1.5 -3.0 +/- 39.0 11 0.0 +/- 32.0 119.0 +/- 50.0 -0.2+5.2 0.7 +/- 5.5 1.3 +/-2.1 0.1 +/- 1.3 -37.0 +/- 39.0 15-C -12.0 +/- 30.0 132.0 +/- 50.0 -1.3 +/- 5.0 -1.8 +/- 6.5 1.2 +/- 1.9 -0.9 +/- 1.6 -11.0+/- 37.0 27 13.0 +/- 26.0 95.0 +/- 47.0 0.6 +/- 4.5 4.6+/- 5.5 0.5 +/- 2.4 -1.2 +/- 1.8 2.0 +/- 36.0 Cs-134 Cs-137 Mn-54 Nb-95 Ru-103 Ru-106 Zr-95 01 0.1 +/- 1.9 2.4+/-3.5 0.1 +/- 1.6 -1.4 +/- 5.6 0.5 +/- 4.2 -8.0 +/- 13.0 -1.4 +/- 5.7 02 1.1 +/- 1.6 -1.0+/- 2.4 0.2 +/- 1.6 0.8 +/- 4.4 -0.4 +/- 4.1 -9.4 +/- 9.9 1.6 +/- 3.8 03 0.1 +/- 1.7 0.4+/-2.6 0.5 +/- 1.2 1.1 +6.5 0.4 +/- 4.4 -5.0 +/- 15.0 -0.5 +/- 4.8 04 -0.8 +/- 1.5 0.5+/-2.2 -1.4 +/- 1.5 0.1 +/-4.5 1.2 +/- 3.2 -6.0 +/- 14.0 -0.9 +/- 3.4 10 -0.8 +/- 1.5 -0.4 +/- 2.5 -0.8 +/- 1.6 -0.2 +/- 6.0 1.6 +/- 3.8 4.6 +/- 9.2 -4.3+/-4.6 I1 1.2 +/- 1.6 0.1 +/- 2.8 0.2 +/- 1.7 0.6+/- 5.6 1.7+/- 3.7 3.0 +/- 13.0 0.7 +/- 5.4 15-C 0.3 +/- 1.2 -0.1 +/- 2.2 1.3 +/- 1.6 -0.4 +/- 4.3 -2.0 +/- 3.4 3.0 +/- 13.0 -2.2 +/- 3.9 27 0.6+/- 1.4 -0.1 +/- 2.6 -0.7 +/- 1.3 0.7 +/- 5.3 2.1 +/-4.0 16.0+/- 11.0 -1.0 +/- 4.1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 4-C, Air Particulates Gamma Spectra - Quarter 3 (pCi/m3 x 1000) Page I of I Location Isotope Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 01 -15.0 +/- 36.0 73.0 +/- 37.0 2.5 +/- 4.6 -2.5

  • 6.3 0.5 +/- 2.5 0.9+/- 2.0 -12.0
  • 39.0 02 14.0 +/- 40.0 89.0 +/- 39.0 0.1*4.5 -1.7
  • 5.4 1.9
  • 2.6 -0.5 +/- 1.5 -10.0* 31.0 03 -8.0 4 43.0 94.0
  • 42.0 3.6 +/- 6.0 0.2
  • 6.2 -0.6
  • 2.5 -0.9* 1.1 -10.0
  • 41.0 04 0.0 +/- 41.0 103.0 i 42.0 -3.4 4.8 0.7 +/- 5.2 1.7
  • 1.9 0.5* 1.4 -42.0
  • 40.0 10 15.0+/- 29.0 57.0 +/- 36.0 1.3
  • 4.6 -2.2 +/- 5.6 -1.3
  • 2.5 -0.5
  • 1.3 -17.0
  • 36.0 11 -8.0 i 15.0 90.0+/- 44.0 -3.1 +/- 5.7 0.8
  • 6.4 -0.6
  • 2.6 0.5 + 1.4 -23.0
  • 46.0 15-C 0.0 +/- 37.0 114.0*43.0 1.2
  • 5.1 -1.7 +/- 5.6 -0.2
  • 2.2 -1.4
  • 1.5 34.0
  • 39.0 27 16.0 +/- 32.0 74.0
  • 43.0 -0.6
  • 4.9 -1.3 +/- 6.9 0.6
  • 2.5 -0.8
  • 1.9 1.0 +/- 36.0 Cs-134 Cs-137 Mn-54 Nb-95 Ru-103 Ru-106 Zr-95 01 -0.6* 1.3 -0.4+/-2.5 -0.1
  • 1.2 2.4 +/- 3.7 -1.3 +/- 3.7 -3.0
  • 15.0 3.7
  • 3.6 02 -0.1 i 1.4 0.9*2.4 -0.8
  • 1.3 1.6 4 3.9 0.0 + 3.1 5.0* 13.0 -1.1 +/- 4.7 03 0.1 +/- 1.6 -0.5 +/- 2.7 0.6
  • 1.6 1.1+/-4.2 0.0*4.0 -4.0 +/- 11.0 -3.5 +/- 5.3 04 0.1
  • 1.3 -0.4 +/- 2.2 0.6+/- 0.9 -2.3
  • 3.6 -0.4
  • 3.0 -9.0
  • 14.0 -2.4 +/- 4.1 10 -0.9
  • 1.7 -1.7* 2.4 -0.4 + 1.4 -1.1
  • 4.5 -4.2+/-3.7 -16.0* 12.0 -0.3 +/- 3.8 11 1.6
  • 1.9 0.4+/-2.5 0.1
  • 1.2 0.3 +/-4.7 -2.2 +/- 3.7 2.0
  • 14.0 0.2
  • 5.1 15-C 0.3
  • 1.4 -1.1 +/- 2.7 0.3
  • 1.2 -2.5 +/- 4.7 -0.4 3.1 2.0
  • 12.0 -1.7
  • 4.0 27 -0.2 +/- 1.7 0.7*2.7 -1.1
  • 1.5 -1.0 3.9 -1.8
  • 2.6 5.0 +/- 14.0 -0.4 +/- 4.6

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 4-D, Air Particulates Gamma Spectra - Quarter 4 (pCilm3 x 1000) Page 1 of I Location Isotope Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 01 -31.0 +/- 47.0 77.0 +/- 38.0 1.4+/- 5.3 0.6 +/- 5.6 -1.0 +/- 2.2 1.2+/- 1.8 -1.0+ 57.0 02 -11.0+/-48.0 101.0 +/- 40.0 7.4 +/- 5.6 -1.7+/- 6.6 0.6+/- 2.5 -0.7+ 1.8 15.0 + 42.0 03 -11.0+/-58.0 93.0 +/- 36.0 0.1+/- 6.6 2.0 +/- 5.9 -0.3 + 2.8 1.2 +/- 1.9 -39.0 +/- 45.0 04 -11.0+/-38.0 105.0 +/- 46.0 -5.9 +/- 6.5 -1.2 +/- 6.6 -1.0 +/- 2.0 -0.5 +/- 1.1 -24.0 +/- 50.0 10 22.0+/- 31.0 28.0 +/- 29.0 2.8 +/- 5.8 3.4 +/- 5.2 -1.0 +/- 2.4 1.0 +/- 1.9 -34.0 +/- 48.0 11 33.0 +/- 74.0 77.0 +/- 43.0 4.6 +/- 7.0 4.5 +/- 6.0 -1.0 +/- 2.4 0.7 +/- 1.6 8.0+/- 48.0 15-C 0.0 +48.0 93.0 +/- 43.0 1.3 +/- 5.8 -5.9 +/- 6.9 -1.0 +/- 2.2 -0.8 +/- 1.8 -12.0 +/- 52.0 27 -20.0 +/- 110.0 46.0 +/- 52.0 -6.4 +/- 7.3 2.1 +/- 7.1 0.2 +/- 3.2 -0.5 +/- 1.3 20.0 +/- 72.0 Cs-134 Cs-137 Mn-54 Nb-95 Ru-103 Ru-106 Zr-95 01 2.2 +/- 1.6 -0.1 +/- 2.5 0.3 +/- 1.3 0.4 +/- 4.0 1.4 +/- 4.0 3.0 +/- 12.0 2.6 +/- 3.3 02 -1.3 +/- 1.7 -1.7 +/- 2.3 -0.2 +/- 1.7 -1.9 +/-4.5 -1.4 +/- 3.2 3.0+/- 13.0 -0.3 +/- 4.1 03 -1.1 +/- 1.9 1.4 +/- 2.5 0.0+ 1.9 -3.7 +/- 5.2 0.5 +/- 4.5 -2.0 +/- 14.0 1.1 +/-4.7 04 -0.8 +/- 1.4 -1.4 +/- 2.5 -0.3 + 1.4 -2.4 +/- 6.8 0.0+/- 4.2 -21.0+/- 14.0 0.3 +/- 4.9 10 1.5 +/- 1.6 -1.7 +/- 2.4 -0.9 +/- 1.2 -0.7 +/- 6.0 -2.5 +/- 4.7 7.0+/- 11.0 2.6+ 4.6 11 0.2 +/- 1.0 -0.3 +/- 2.5 1.4 +/- 1.8 1.2 +/-4.5 -3.0+/-5.0 0.0+/-+15.0 0.2 +/- 5.4 15-C 0.8 + 1.7 0.8 +/- 2.5 0.1 +/- 1.3 -4.0+/-5.6 -1.1 +/- 4.0 -7.0 +/- 14.0 4.5+/-5.0 27 -0.9 + 1.4 0.6 +/- 2.8 0.6 +/- 1.6 0.2 +/- 7.2 1.8 +/- 5.8 7.0 +/- 14.0 2.1 + 5.8

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 6, Soil (pCi/g dry) Page I of 2 Location Collection Isotope Date 03 Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 03/30/04 0.15 +/- 0.48 -0.05 +/- 0.09 0.19* 0.21 -0.05 +/- 0.03 0.02 +/- 0.04 0.02 +/- 0.57 06/29/04 -0.17 0.46 0.05 +/- 0.07 -0.24 +/- 0.24 -0.01 +/- 0.04 0.00

  • 0.05 0.10+/-0.48 09/20/04 0.14+/- 0.45 -0.04 +/- 0.07 -0.14 +/- 0.27 -0.01 +/- 0.04 0.01 +/- 0.05 -0.08 +/- 0.46 11/16/04 0.51 +/- 0.61 -0.04 +/- 0.12 -0.20 +/- 0.28 -0.05 +/- 0.05 -0.02 +/- 0.05 0.52 +/- 0.72 Cs-134 Cs-137 Fe-59 K-40 Mn-54 Nb-95 03/30/04 -0.01 +/- 0.04 0.97 +/- 0.11 0.03 +/- 0.10 8.10* 1.10 -0.03 +/- 0.04 0.01 +/- 0.06 06/29/04 0.01 +/- 0.03 1.02 +/- 0.12 -0.01 +/- 0.11 9.40i 1.30 0.02 +/- 0.05 -0.04 +/- 0.05 09/20/04 0.01 +/- 0.05 1.23*0.14 0.06 +/- 0.08 7.90+ 1.40 0.00
  • 0.04 -0.02 +/- 0.06 11/16/04 -0.01 + 0.05 0.81 +/- 0.13 -0.03 +/- 0.13 6.30* 1.20 -0.03 +/- 0.04 -0.02
  • 0.07 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/30/04 0.01 i 0.05 -0.09 +/- 0.35 0.08*0.10 0.63 +/- 0.16 0.01 +/- 0.09 -0.01 +/- 0.06 06/29/04 0.03 +/- 0.05 -0.07 +/- 0.39 0.04+/-0.11 0.64+/-0.19 -0.09*0.10 0.00 +/- 0.08 09/20/04 -0.02 +/- 0.05 0.12 t 0.41 -0.01 + 0.13 0.62 +/- 0.21 0.04 4 0.20 -0.20* 0.11 11/16/04 -0.06 +/- 0.08 -0.41 +/- 0.38 -0.01 +/- 0.13 0.48*0.19 -0.02 + 0.12 -0.08 : 0.13 04 Be-7 Cc-141 Ce-144 Co-58 Co-60 Cr-51 03/30/04 0.34 +/- 0.36 -0.03 : 0.08 -0.20 i 0.20 0.02 +/- 0.03 0.02 +/- 0.03 -0.07 + 0.46 06/29/04 0.44 +/- 0.34 0.03 + 0.06 0.09 +/- 0.16 -0.02 +/- 0.04 0.05 +/- 0.04 0.06 +/- 0.31 09/21/04 0.40 +/- 0.34 -0.01 +/- 0.06 0.00 : 0.20 -0.04 +/- 0.03 0.01 +/- 0.03 -0.06 +/- 0.30 11/16/04 0.59 +/- 0.49 0.06 +/- 0.08 0.07 +/- 0.22 0.02 +/- 0.04 0.02 +/- 0.03 -0.29 +/- 0.51 Cs-134 Cs-137 Fe-59 K-40 Mn-54 Nb-95 03/30/04 0.01 +/- 0.03 0.44 + 0.06 0.02 +/- 0.09 12.53 + 0.98 0.03 +/- 0.03 -0.01 + 0.05 06/29/04 0.02 +/- 0.03 0.51 + 0.07 -0.06 + 0.08 12.50
  • 1.20 0.03 +/- 0.04 0.04 +/- 0.05 09/21/04 0.01 +/- 0.03 0.50 + 0.06 -0.03 +/- 0.07 11.86
  • 0.95 -0.01 +/- 0.03 -0.01 + 0.06 11/16/04 -0.01 +/- 0.03 0.48 +/- 0.07 0.02 + 0.09 10.70 +/- 1.10 0.00 +/- 0.03 -0.04 +/- 0.06 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/30/04 0.03 +/- 0.04 -0.14 +/- 0.26 0.00 +/- 0.07 1.21 +/- 0.12 0.07 + 0.11 -0.01 +/- 0.06 06/29/04 0.01
  • 0.04 0.15 +/- 0.30 -0.03 +/- 0.09 1.04
  • 0.15 0.01
  • 0.17 -7.30 +/- 7.40 09/21/04 0.03 +/- 0.04 0.03 +/- 0.28 0.04 +/- 0.09 1.10 +/- 0.14 0.10
  • 0.15 -0.04 +/- 0.10 11/16/04 -0.02 +/- 0.05 -0.16 + 0.29 -0.03 +/- 0.08 1.00 + 0.15 -0.06 + 0.14 -12.30
  • 8.60 14-C Be-7 Ce-141 Ce-144 Co-58 Co-60 Cr-51 03/30/04 0.60 4 0.51 0.09*0.12 0.02 4 0.22 0.01 +/- 0.04 -0.03 + 0.03 0.26 +/- 0.49 06/29/04 0.36* 0.16 0.03 + 0.05 -0.07 4 0.15 -0.01 +/- 0.02 -0.01 +/- 0.02 0.07 +/- 0.27 09/20/04 0.63 +/- 0.54 0.09 +/- 0.08 -0.15 + 0.27 -0.07 +/- 0.04 0.00 t 0.03 0.10
  • 0.40 11/16/04 0.65 +/- 0.88 -0.09
  • 0.10 -0.18 +/- 0.27 -0.06 +/- 0.04 0.01 +/- 0.03 -0.07 +/- 0.61 Cs-134 Cs-137 Fe-59 K-40 Mn-54 Nb-95 03/30/04 0.01 +/- 0.03 1.46 +/- 0.09 0.02
  • 0.08 12.40 +/- 1.00 0.01 +/- 0.04 -0.02 +/- 0.08 06/29/04 0.05 +/- 0.08 1.66 i 0.07 -0.02 +/- 0.05 11.70
  • 0.65 0.01 + 0.02 -0.01
  • 0.03 09/20/04 -0.02 +/- 0.04 1.60 +/- 0.12 -0.04 +/- 0.08 13.00 i 1.30 0.00
  • 0.04 -0.06
  • 0.07 11/16/04 -0.05 +/- 0.13 1.37+/-0.10 -0.04 +/- 0.09 10.20 + 1.00 0.01 +/- 0.03 0.08 + 0.06

Dominion Nuclear Connecticut Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 6, Soil (pCi/g dry) Page 2 of 2 Location Collection Isotope Date 14-C Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/30/04 0.03 +/- 0.05 0.05 i 0.31 -0.05 + 0.09 1.32 +/- 0.14 -0.07 +/- 0.14 0.01 +/- 0.07 06/29/04 -0.02 +/- 0.03 0.06 + 0.20 -0.01 +/- 0.07 1.32 +/- 0.09 -0.01 +/- 0.09 -10.20 +/- 4.30 09/20/04 -0.01 +/- 0.05 -0.44 +/- 0.38 0.07+/- 0.11 1.55 +/- 0.17 0.12 +/- 0.16 -15.00 + 11.00 11/16/04 -0.01 +/- 0.05 -0.01 +/- 0.31 -0.02 +/- 0.11 1.18 +/- 0.16 0.07 +/- 0.14 -0.12 +/- 0.14

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 8, Goat Milk (pCi/L) Page I of I Location Collection Isotope Date 21 Ba-140 Cs-134 Cs-137 1-131 K-40 La-140 04/15/04 1.10+/- 5.40 0.00 + 3.40 2.30 +/- 3.20 0.03 +/- 0.25 1630.00+/- 120.00 1.30 +/- 6.20 04/28/04 7.80+/- 7.90 0.30 +/- 4.10 2.60 +/- 4.60 0.08 +/- 0.27 1460.00 +/- 150.00 9.00 +/- 9.10 05/11/04 1.80 +/- 5.00 0.10+/-3.00 0.50 +/- 3.50 0.03 +/- 0.23 1220.00 +/- 110.00 2.10+/- 5.70 05/20/04 -0.60 +/- 6.50 0.50 + 4.50 3.30 + 4.50 -0.04 +/- 0.02 1520.00 +/- 150.00 -0.70 +/- 7.50 06/02/04 10.70 +/- 8.00 -3.70 +/- 4.80 -4.30 +/- 4.60 0.04 +/-0.21 1610.00 +/- 130.00 12.30+/- 9.10 06/15/04 -0.40 +/- 5.40 3.10 +/- 4.00 1.30 +/- 3.40 -0.05 +/- 0.02 1620.00 + 130.00 -0.50 +/- 6.20 07/13/04 1.90+/-4.30 -1.00 +/- 2.50 10.00 +/- 3.40 0.24 +/- 0.46 1920.00 +/- 99.00 2.20 +/- 4.90 07/27/04 0.00 +/- 5.90 -0.60 +/- 4.50 11.30 +/- 5.60 -0.06 +/- 0.02 1410.00+/- 150.00 0.00 +/- 6.80 08/10/04 0.00 +/- 3.00 -0.10+/-2.40 5.30 +/- 2.80 0.10 +/- 0.32 1730.00 +/- 85.00 0.00 +/- 3.50 08/30/04 5.10 +/-5.50 1.30+/- 3.70 2.20+/-4.10 -0.05 +/- 0.05 1500.00i 120.00 5.80 + 6.30 Sr-89 Sr-90 06/15/04 6.30 +/- 4.70 1.24 +/- 0.73 08/30/04 0.00 +/- 6.10 0.93 +/- 0.95 22 Ba-140 Cs-134 Cs-137 I-131 K-40 La-140 03/23/04 -3.50 +/- 6.10 -2.30 +/- 3.30 4.60 +/- 3.90 0.27 +/- 0.38 1710.00+/- 120.00 -4.10+7.00 04/14/04 -0.80 +/- 3.20 -0.10 + 2.10 1.10+/- 2.00 0.13+/- 0.33 1754.00 +/- 77.00 -0.90 + 3.60 04/28/04 0.20 +/- 4.50 -0.40 +/- 2.50 2.20 +/- 2.30 0.10 + 0.33 1760.00 + 96.00 0.30 +/- 5.10 05/11/04 -0.60 +/- 4.90 0.00 +/- 3.50 6.40 +/- 4.60 0.05 +/- 0.26 1630.00 +/- 120.00 -0.70 +/- 5.70 05/19/04 1.80 +/- 3.20 -0.80 + 2.20 11.70+/- 2.80 0.08 +/- 0.26 1773.00 +/- 80.00 2.10+/- 3.70 Sr-89 Sr-90 03/23/04 -3.90 +/- 6.60 6.20+/- 1.10 05/19/04 -16.00 +/- 16.00 8.10+/- 1.30 24-C Ba-140 Cs-134 Cs-137 1-131 K-40 La-140 04/28/04 6.50 +/- 7.20 4.50 +/- 5.50 5.50 +/- 5.00 0.08 +/- 0.28 1670.00 +/- 170.00 7.40 +/- 8.30 05/12/04 2.50 +/- 3.80 -0.40 +/- 3.20 2.50 +/- 3.30 -0.01 +/- 0.06 1550.00 +/- 120.00 2.90 +/- 4.40 05/20/04 0.50 + 6.40 0.90 +/- 4.30 4.00 +/- 3.90 -0.05 +/- 0.02 1730.00+/- 150.00 0.50 +/- 7.30 06/02/04 2.70 +/- 6.40 5.10 +/- 3.50 3.70 +/- 3.70 -0.06 +/- 0.03 1560.00+/- 130.00 3.10 +/- 7.30 06/15/04 0.00 +/- 6.00 1.10 + 4.20 0.50 + 4.00 -0.05 +/- 0.02 1690.00:+/- 140.00 0.00 +/- 6.90 07/13/04 0.00 +/- 5.30 1.40 +/- 4.60 3.00+/- 4.10 0.05 +/- 0.33 1620.00+/- 160.00 0.00 +/- 6.10 07/27/04 -0.70 +/- 5.80 0.20 +/- 4.60 1.20+/- 4.60 -0.09 +/- 0.03 1610.00 + 150.00 -0.80 +/- 6.70 08/10/04 -0.60 +/- 6.10 1.40 +/- 4.50 2.40 +/- 4.50 0.10 +/- 0.33 1630.00 +/- 160.00 -0.70 +/- 7.00 08/30/04 -3.60 + 3.80 2.10+/- 3.50 3.80 +/- 4.40 -0.05 +/- 0.07 1780.00+/- 140.00 -4.10+/-4.30 09/22/04 -1.90+ 6.30 1.50 +/- 4.90 9.00 +/- 6.20 -0.06 +/- 0.02 1880.00 +/- 180.00 -2.20 +/- 7.20 Sr-89 Sr-90 06/15/04 5.30 +/- 5.90 1.78 +/- 0.93 09/22/04 -0.40 +/- 4.40 1.62 +/- 0.95

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 9, Pasture Grass (pCi/g wet) Page l of 3 Location Collection Isotope Date 21 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 01/27/04 -0.091 +/- 0.072 F 0.460 +/- 0.280 -0.012 +/- 0.034 0.060

  • 0.088 0.027 +/- 0.031 -0.015 +/- 0.035 02/18/04 -0.024 +/- 0.040 F 0.290 +/- 0.220 -0.004 +/- 0.024 0.023 +/- 0.077 0.001 +/- 0.025 0.002 +/- 0.031 03/24/04 -0.080 i 0.120 F 0.180 +/- 0.360 0.018 +/- 0.057 0.030 +/- 0.150 -0.013 +/- 0.040 -0.033 +/- 0.035 09/22/04 0.011 +/- 0.048 0.910+/- 0.430 0.019 +/- 0.031 -0.010 +/- 0.079 -0.013 +/- 0.032 0.013 +/- 0.036 09/29/04 0.030 +/- 0.045 1.770 +/- 0.380 0.002 +/- 0.023 -0.004 +/- 0.056 0.007
  • 0.021 0.000 +/- 0.028 10/11/04 0.007 +/- 0.038 3.580 +/- 0.420 0.026 +/- 0.028 0.006 +/- 0.092 -0.005 +/- 0.021 0.002 +/- 0.022 10/27/04 0.021 +/- 0.036 2.220 +/- 0.400 0.005 t 0.028 -0.020
  • 0.077 0.004 +/- 0.023 0.008 +/- 0.023 11/10/04 -0.049 +/- 0.061 3.860+/- 0.450 -0.031 + 0.037 -0.090 +/- 0.100 -0.020 +/- 0.028 -0.016 +/- 0.025 12/15/04 -0.030 +/- 0.140 F -0.260 +/- 0.260 0.027 +/- 0.041 -0.036 +/- 0.087 0.018 +/- 0.033 0.014 +/- 0.032 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 01/27/04 -0.130 +/- 0.210 -0.002 +/- 0.031 0.035 +/- 0.027 0.027 + 0.095 0.042 +/- 0.073 12.100 +/- 1.000 02/18/04 -0.130 +/- 0.160 -0.004 +/- 0.028 0.088 + 0.033 0.043 +/- 0.080 -0.004 +/- 0.035 12.000 +/- 0.900 03/24/04 -0.190 i 0.430 0.025 +/- 0.035 0.029 +/- 0.032 -0.040
  • 0.140 0.200 +/- 0.280 14.600 +/- 1.200 09/22/04 0.040
  • 0.230 -0.001 + 0.029 0.026* 0.029 -0.037+/- 0.091 0.006+/-0.012 5.100+/- 1.000 09/29/04 -0.030 +/- 0.140 0.004: 0.018 0.010
  • 0.022 0.057 +/- 0.063 -0.002 +/- 0.014 3.620 +/- 0.850 10/11/04 0.140 +/- 0.190 -0.008 +/- 0.022 0.015 +/- 0.019 -0.013 +/- 0.055 -0.001
  • 0.009 5.930 +/- 0.700 10/27/04 0.070 0.180 -0.014 +/- 0.029 0.010 +/- 0.024 0.049 +/- 0.075 0.005 +/- 0.028 5.410 +/- 0.940 11/10/04 -0.030 i 0.270 0.007 +/- 0.024 0.015 +/- 0.024 0.030 +/- 0.076 0.020
  • 0.029 6.860 +/- 0.770 12/15/04 0.000 +/- 0.290 0.005 +/- 0.030 0.162
  • 0.041 0.050 + 0.110 0.060
  • 0.200 12.050 +/- 0.960 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 01/27/04 -0.105 + 0.083 -0.020+ 0.027 0.002 +/- 0.036 -0.005 + 0.028 -0.170 +/- 0.210 0.008 +/- 0.061 02/18/04 -0.027 +/- 0.046 -0.009
  • 0.025 -0.019 +/- 0.027 -0.003 +/- 0.022 -0.030 +/- 0.210 0.032 +/- 0.061 03/24/04 -0.090 t 0.140 0.017 +/- 0.035 -0.001 +/- 0.055 0.051 +/- 0.048 0.040 + 0.340 -0.029 +/- 0.077 09/22/04 0.012 +/- 0.055 0.005 +/- 0.030 0.020 + 0.029 0.011 +/- 0.024 0.220 +/- 0.250 0.006 +/- 0.052 09/29/04 0.035 +/- 0.052 -0.011 +/- 0.018 -0.010 +/- 0.023 -0.002 t 0.017 0.040 +/- 0.130 0.029 +/- 0.043 10/11/04 0.009 +/- 0.044 0.005
  • 0.019 0.008 +/- 0.028 0.004 + 0.021 -0.130 +/- 0.200 0.016 +/- 0.050 10/27/04 0.024 +/- 0.042 -0.007 + 0.024 -0.019 +/- 0.035 -0.013 +/- 0.023 -0.100 +/- 0.180 -0.031 +/- 0.060 11/10/04 -0.056 + 0.070 -0.026 + 0.025 0.004 +/- 0.035 0.015 +/- 0.033 -0.070 +/- 0.230 -0.023 +/- 0.058 12/15/04 -0.030 i 0.160 0.025 i 0.029 0.015 +/- 0.045 -0.016 +/- 0.035 -0.020 +/- 0.210 0.076 +/- 0.069 Th-228 Zn-65 Zr-95 01/27/04 0.110 + 0.120 0.018 + 0.066 0.023 +/- 0.054 02/18/04 -0.090 +/- 0.130 0.021 i 0.058 -0.043 + 0.046 03/24/04 0.020 + 0.140 0.020 +/- 0.083 -0.074 + 0.069 09/22/04 -0.020 + 0.110 0.000 +/- 0.075 0.023 +/- 0.055 09/29/04 0.113 +/- 0.085 0.000 +/- 0.054 -0.008 +/- 0.025 10/11/04 0.010 +/- 0.083 0.002 i 0.053 0.011 + 0.038 10/27/04 0.060 + 0.130 -0.063 + 0.062 0.015 +/- 0.037 11/10/04 0.020 +/- 0.110 -0.074 + 0.062 -0.033 +/- 0.039 12/15/04 -0.040 +/- 0.120 -0.037 + 0.076 -0.008 +/- 0.056 22 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 01/27/04 -0.018 +/- 0.047 F 0.400 +/- 0.250 -0.021 +/- 0.028 -0.030 +/- 0.100 0.002 +/- 0.025 -0.019 i 0.028 02/18/04 0.008 +/- 0.041 F 0.080 +/- 0.190 -0.003 +/- 0.026 -0.003 +/- 0.074 0.011
  • 0.025 0.012
  • 0.027 06/03/04 0.019 +/- 0.026 0.860 +/- 0.240 -0.012 +/- 0.021 -0.022 +/- 0.068 0.006
  • 0.016 0.002 +/- 0.016 06/16/04 -0.042 +/- 0.048 0.620 +/- 0.330 -0.010 +/- 0.029 -0.014 +/- 0.072 -0.007 +/- 0.026 -0.011 +/- 0.028 07/14/04 -0.029 +/- 0.038 1.700+/- 0.410 -0.025 +/- 0.036 0.010
  • 0.120 0.000 +/- 0.026 0.032 +/- 0.026 07/28/04 0.000
  • 0.024 1.190 +/- 0.310 -0.016 +/- 0.021 0.003 +/- 0.063 0.011 +/- 0.024 0.019 +/- 0.027 08/11/04 0.010* 0.038 1.140* 0.340 -0.012 +/- 0.030 -0.066
  • 0.094 0.025
  • 0.022 -0.003 +/- 0.028 08/30/04 0.020
  • 0.120 0.950 +/- 0.330 -0.002 +/- 0.031 -0.035 +/- 0.066 -0.006 +/- 0.023 0.013 +/- 0.024

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 9, Pasture Grass (pCi/g wet) Page 2 of 3 Location Collection Isotope Date 22 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 09/22/04 0.012+/- 0.037 1.960 0.430 0.034 + 0.032 0.000 +/- 0.110 -0.002 + 0.022 0.031 +/- 0.030 09/29/04 0.000

  • 0.063 3.210 +/- 0.600 -0.028 +/- 0.032 -0.011 +/- 0.086 -0.042 + 0.030 0.016* 0.018 10/11/04 0.013 +/- 0.053 2.450+/- 0.460 0.017+/- 0.036 -0.010 +/- 0.120 -0.009 +/- 0.024 0.015 +/- 0.027 10/27/04 -0.014 +/- 0.054 4.090 + 0.580 -0.025 + 0.037 -0.010 +/- 0.130 0.003 +/- 0.024 -0.003 +/- 0.035 11/10/04 -0.028 +/- 0.084 4.360 : 0.550 0.010 +/- 0.035 0.023 +/- 0.093 -0.015 +/- 0.036 0.010+/-:0.034 12/15/04 G Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 01/27/04 -0.180 +/- 0.240 -0.004 +/- 0.025 -0.008 +/- 0.021 0.003 +/- 0.070 -0.023 +/- 0.077 11.910
  • 0.770 02/18/04 0.020 +/- 0.170 0.009 +/- 0.025 0.003 +/- 0.023 -0.022 +/- 0.082 -0.016
  • 0.039 14.200 +/- 0.890 06/03/04 0.040 +/- 0.140 -0.003 +/- 0.015 0.020
  • 0.016 0.035 +/- 0.047 -0.013 +/- 0.004 4.250 +/- 0.600 06/16/04 0.090 +/- 0.200 0.026+/- 0.023 0.000
  • 0.019 0.033 +/- 0.079 -0.001 +/- 0.022 3.880 +/- 0.890 07/14/04 0.080
  • 0.230 0.014 +/- 0.025 0.007
  • 0.027 0.038 +/- 0.070 0.015 +/- 0.027 3.290 +/- 0.710 07/28/04 -0.040
  • 0.160 0.001 +/- 0.026 0.015
  • 0.024 0.071 +/- 0.065 -0.004 +/- 0.011 2.660 +/- 0.710 08/11/04 0.060 +/- 0.190 0.002 +/- 0.022 0.007
  • 0.022 0.045 +/- 0.063 -0.004 +/- 0.004 5.190 +/- 0.770 08/30/04 0.190+/- 0.230 -0.001 +/- 0.023 0.026 +/- 0.025 -0.075
  • 0.097 -0.011
  • 0.004 4.370 0.850 09/22/04 0.100 +/- 0.210 -0.012 +/- 0.025 0.017 +/- 0.023 0.000
  • 0.062 0.004
  • 0.010 4.520 +/- 0.780 09/29/04 0.010
  • 0.200 0.004 +/- 0.028 0.013 +/- 0.023 0.045
  • 0.072 -0.005
  • 0.002 3.380 +/- 0.920 10/11/04 0.110+/- 0.240 -0.005 +/- 0.028 0.002
  • 0.029 -0.089
  • 0.089 0.002
  • 0.013 5.870 +/- 0.890 10/27/04 -0.260 +/- 0.290 0.016 +/- 0.033 0.047 + 0.034 -0.006 +/- 0.085 -0.009
  • 0.021 4.340 +/- 0.880 11/10/04 0.190 +/- 0.250 -0.003 +/- 0.031 0.036 +/- 0.039 0.063 +/- 0.086 -0.002
  • 0.018 7.600 i 1.000 12/15/04 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 01/27/04 -0.021 +/- 0.054 -0.015 +/- 0.022 0.034 +/- 0.030 -0.019 +/- 0.027 0.110
  • 0.220 -0.007 + 0.053 02/18/04 0.009 +/- 0.048 -0.003 4 0.025 0.001 +/- 0.028 -0.008 +/- 0.022 0.080
  • 0.180 0.034 +/- 0.060 06/03/04 0.022 +/- 0.029 0.000 +/- 0.011 -0.007 +/- 0.021 -0.004
  • 0.016 -0.100 : 0.130 -0.024 +/- 0.035 06/16/04 -0.048 +/- 0.056 -0.005 +/- 0.026 0.012 +/- 0.029 -0.003 + 0.024 -0.040 + 0.170 0.024
  • 0.047 07/14/04 -0.033 +/- 0.044 -0.014 +/- 0.025 -0.029 +/- 0.030 0.020 + 0.025 0.160 + 0.230 0.016* 0.060 07/28/04 0.000
  • 0.028 -0.023
  • 0.020 0.002 +/- 0.020 -0.002 +/- 0.019 0.090 +/- 0.140 -0.021
  • 0.043 08/11/04 0.011
  • 0.044 -0.012 +/- 0.022 -0.014 +/- 0.027 -0.013 +/- 0.024 -0.260 +/- 0.200 -0.003
  • 0.050 08/30/04 0.020 0.130 -0.019* 0.022 -0.001 +/- 0.030 -0.008 +/- 0.024 0.040 +/- 0.170 0.017
  • 0.039 09/22/04 0.013 : 0.042 0.010 +/- 0.022 0.004 +/- 0.022 -0.020 +/- 0.021 0.150 +/- 0.170 0.015 : 0.048 09/29/04 0.000 +/- 0.072 -0.014 : 0.026 0.012 +/- 0.025 0.006 +/- 0.024 0.000 +/- 0.240 -0.018 +/- 0.063 10/11/04 0.015 +/- 0.061 0.015 +/- 0.027 0.019 +/- 0.034 0.007 +/- 0.030 0.050 +/- 0.250 0.029 +/- 0.061 10/27/04 -0.016 +/- 0.062 0.007 + 0.027 -0.001 +/- 0.031 -0.010 +/- 0.030 0.150 +/- 0.250 -0.038 + 0.068 11/10/04 -0.032 +/- 0.097 -0.013 +/- 0.023 -0.051 +/- 0.039 0.009 +/- 0.031 -0.100 +/- 0.230 -0.057 i 0.062 12/15/04 Th-228 Zn-65 Zr-95 01/27/04 -0.006
  • 0.097 0.001 +/- 0.084 -0.024 +/- 0.045 02/18/04 -0.120 +/- 0.140 -0.023 +/- 0.058 -0.010 : 0.045 06/03/04 0.013 +/- 0.053 -0.048 +/- 0.047 -0.010 : 0.030 06/16/04 0.060
  • 0.100 -0.064 +/- 0.059 0.000 : 0.042 07/14/04 0.050
  • 0.120 -0.066 +/- 0.069 -0.023 +/- 0.044 07/28/04 0.008 +/- 0.090 0.000 +/- 0.039 0.014
  • 0.042 08/11/04 0.092 +/- 0.084 -0.041 +/- 0.056 -0.019* 0.038 08/30/04 0.026 +/- 0.093 0.000 +/- 0.060 -0.019
  • 0.049 09/22/04 -0.031 +/- 0.094 -0.004 +/- 0.057 0.018 + 0.038 09/29/04 -0.010 +/- 0.100 -0.055 +/- 0.058 0.012
  • 0.028 10/11/04 0.100* 0.120 -0.014 +/- 0.073 -0.004
  • 0.046 10/27/04 0.160* 0.130 -0.001 +/- 0.058 -0.004
  • 0.054 11/10/04 0.170* 0.130 -0.076+/- 0.074 0.045
  • 0.057 12/15/04

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 9, Pasture Grass (pCi/g wet) Page 3 of 3 Location Collection Isotope Date 24-C Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 01/27/04 0.007 +/- 0.058 F 0.750 +/- 0.290 -0.008 +/- 0.037 -0.040 +/- 0.110 -0.007 + 0.028 -0.012 +/- 0.028 02/18/04 0.008 +/- 0.046 F 0.700 +/- 0.230 0.007 +/- 0.025 -0.030 + 0.068 -0.015 +/- 0.025 0.005 +/- 0.026 03/24/04 0.130 +/- 0.140 F 0.220 +/- 0.230 -0.001 +/- 0.042 0.003 +/- 0.073 0.015 +/- 0.030 0.006 + 0.027 04/15/04 0.021 +/- 0.037 F -0.110+/- 0.170 -0.001 +/- 0.035 0.000 +/- 0.093 0.000 + 0.021 0.011 +/- 0.023 09/29/04 0.025 +/- 0.072 2.280 +/- 0.470 -0.010 +/- 0.026 -0.035 +/- 0.065 -0.003 +/- 0.024 0.002 +/- 0.027 10/11/04 0.000+/- 0.051 1.550 +/- 0.390 -0.009 +/- 0.030 0.009 +/- 0.081 -0.004 +/- 0.029 0.011 +/- 0.028 10/27/04 -0.024 +/- 0.048 2.620 +/- 0.450 -0.008 +/- 0.030 0.080 +/- 0.084 -0.002 +/- 0.028 0.041 +/- 0.032 11/10/04 -0.015 +/- 0.053 4.320+/- 0.350 -0.055 +/- 0.053 -0.058 +/- 0.090 0.005 +/- 0.024 -0.004 +/- 0.022 12/15/04 -0.030 +/- 0.120 F 0.530 +/- 0.380 -0.026 +/- 0.066 0.040 +/- 0.130 -0.015 +/- 0.034 0.028 +/- 0.029 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 01/27/04 -0.350 +/- 0.270 -0.014 +/- 0.027 0.056 + 0.034 -0.026 +/- 0.082 0.000 +/- 0.090 9.490 +/- 0.820 02/18/04 0.100 +/-0.170 0.019+/-0.025 0.078 +/- 0.031 0.019 +/- 0.078 -0.052 +/- 0.050 12.480 +/- 0.840 03/24/04 -0.050 +/- 0.340 -0.006 +/- 0.026 0.079 +/- 0.032 -0.040 +/- 0.120 -0.030 +/- 0.280 19.560 +/- 0.960 04/15/04 -0.040 +/- 0.200 0.015 +/- 0.023 0.043 +/- 0.027 0.018 +/- 0.068 -0.007 +/- 0.003 14.190 +/- 0.720 09/29/04 0.050 +/- 0.160 0.001 +/- 0.020 0.018 + 0.018 0.011 +/- 0.046 0.006 +/- 0.011 3.460 +/- 0.830 10/11/04 0.020 +/- 0.180 -0.007 + 0.030 0.016 +/- 0.026 0.048 + 0.088 0.023 + 0.029 7.600 +/- 1.100 10/27/04 0.090 +/- 0.210 -0.014 +/- 0.029 0.014 +/- 0.024 0.010 +/- 0.100 -0.017 +/- 0.019 6.100 +/- 1.000 11/10/04 0.070 +/- 0.220 -0.011 +/- 0.022 -0.006 + 0.019 -0.006 +/- 0.062 0.000 +/- 0.017 7.760 +/- 0.610 12/15/04 -0.110 +/- 0.370 0.012 +/- 0.032 0.031 +/- 0.033 -0.090 + 0.110 0.130 +/- 0.280 13.290 +/- 0.980 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 01/27/04 0.008 +/- 0.066 0.021 +/- 0.028 0.009 +/- 0.033 0.004 : 0.031 0.310 +/- 0.230 -0.014 +/- 0.061 02/18/04 0.009 +/- 0.053 0.024 +/- 0.023 -0.002 +/- 0.027 -0.005 +/- 0.022 -0.050 +/- 0.180 0.023 +/- 0.054 03/24/04 0.150 +/- 0.160 -0.004 +/- 0.024 -0.019 +/- 0.043 -0.011 +/- 0.032 -0.040 +/- 0.180 0.062 +/- 0.054 04/15/04 0.024 +/- 0.043 -0.002 +/- 0.021 -0.003 +/- 0.029 0.003 +/- 0.024 -0.090 +/- 0.200 0.034 +/- 0.049 09/29/04 0.029 +/- 0.083 0.012 +/- 0.023 -0.002 +/- 0.022 -0.005 +/- 0.022 -0.040 +/- 0.200 -0.015 +/- 0.040 10/11/04 0.000 +/- 0.059 -0.016 +/- 0.023 -0.004 +/- 0.033 -0.002 +/- 0.024 0.030 +/- 0.180 0.038 +/- 0.052 10/27/04 -0.028 +/- 0.055 0.004 +/- 0.025 -0.037 +/- 0.032 -0.006 +/- 0.026 -0.060 +/- 0.200 -0.009 +/- 0.061 11/10/04 -0.017 +/- 0.061 0.012 +/- 0.021 0.007 +/- 0.041 -0.023 +/- 0.025 -0.010 +/- 0.180 0.033 +/- 0.047 12/15/04 -0.030 +/- 0.140 0.000 +/- 0.029 0.007 +/- 0.052 -0.038 +/- 0.043 -0.010 +/- 0.270 0.046 +/- 0.069 Tlh-228 Zn-65 Zr-95 01/27/04 0.020 +/- 0.110 -0.117 +/- 0.068 0.000 +/- 0.049 02/18/04 0.079 +/- 0.082 0.004 +/- 0.057 0.040 +/- 0.041 03/24/04 0.106 +/- 0.089 0.020 +/- 0.110 0.060 +/- 0.052 04/15/04 0.030 +/- 0.100 -0.039 +/- 0.054 0.028 +/- 0.038 09/29/04 -0.013 +/- 0.077 0.007 +/- 0.067 0.000 +/- 0.042 10/11/04 -0.069 +/- 0.093 -0.092 +/- 0.063 0.042 +/- 0.050 10/27/04 0.090 +/- 0.120 0.039 +/- 0.072 0.023 +/- 0.054 11/10/04 0.087 +/- 0.084 0.115+/- 0.081 -0.025 +/- 0.041 12/15/04 0.020 +/- 0.120 -0.037 +/- 0.071 -0.028 +/- 0.062

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 10, Well Water (pCi/l) Page I of 2 Location Collection Isotope Date 70-C Ba-140 Be-7 Co-58 Co-60 Cr-51 Cs-134 03/22/04 0.0+/-3.6 -8.0 +/- 17.0 1.0+/-2.2 -0.8:1:2.3 0.01 19.0 1.0+/-2.2 06/02/04 1.6 +/- 6.0 -13.0 +/- 21.0 0.6:1 2.8 0.7+/-3.0 -4.0 +/- 28.0 -0.3 +/- 2.8 06/17/04 1.5 +/-4.4 26.0 +/- 20.0 -2.412.6 0.4+3.0 -8.0 +/- 19.0 0.5 +/-2.5 10/14/04 -0.6i+/-:5.0 -24.0 +/- 23.0 0.5 +/- 2.9 0.0:1 2.8 2.0:+132.0 1.6+/-2.9 12/09/04 0.9 + 3.7 7.4 +/- 8.5 0.0+/- 0.9 0.1 +/- 1.1 -5.0 1 12.0 0.3 +/- 0.8 Cs-137 Fe-59 11-3 1-131 K-40 La-140 03/22/04 0.7+/-2.1 -3.3 +/- 5.3 H 0.5 :14.2 16.0 +/- 32.0 0.0+/-4.2 06/02/04 -1.2 : 2.8 7.7 +/- 8.3 280.0 +/- 740.0 1.1:+/-:7.9 7.0+/- 34.0 1.9 +/- 6.9 06/17/04 1.1+/-2.3 2.2 +/- 6.7 470.0 +/- 930.0 -5.2+/- 4.8 43.0 : 32.0 1.7 +/- 5.1 10/14/04 -0.9+/-2.7 3.2 +/- 7.5 -730.0 +/- 680.0 2.9: 8.5 -25.0 +/- 32.0 -0.7 +/- 5.8 12/09/04 0.3+/-0.8 -1.2 +/- 2.9 -110.0 +/- 850.0 1.2: 8.3 15.0 +/- 15.0 1.0 +/- 4.3 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Sr-90 03/22/04 0.0 +/- 1.9 -2.2+/- 2.6 -1.2 +/- 2.4 -7.0 + 19.0 -2.6+/-1 5.3 2.2 +/- 1.1 06/02/04 -0.8 +/- 2.7 5.0 5.3 -2.0+/-3.2 28.0: 25.0 2.2+/- 7.0 0.8 +/- 1.1 06/17/04 -0.3 +/- 2.4 -2.4 3.3 -1.8 +/- 2.5 11.0 + 18.0 -1.5 6.1 -0.2 +/- 1.0 10/14/04 -1.9 +/- 2.4 -3.2+/- 3.7 -0.4:+/- 3.5 1.0 i 25.0 -3.5+/-7.5 0.9 +/- 0.8 12/09/04 -0.3 + 0.8 0.7: 1.2 -1.2 +/- 1.7 -10.3 +/- 7.6 0.1 +/- 2.1 -0.9+/- 1.1 Th-228 Zn-65 Zr-95 03/22/04 7.5 +/- 7.3 6.7 +/- 8.8 0.6 + 3.8 06/02/04 -2.4 +/- 9.8 5.0: 11.0 5.1+/- 5.4 06/17/04 2.0+/- 11.0 3.0+/- 11.0 0.6+/-4.5 10/14/04 -2.2 +/- 8.7 2.0i 11.0 -0.8 +/- 4.8 12/09/04 0.6+/- 4.9 0.9+/-2.5 0.4 1.7 71 Ba-140 Be-7 Co-58 Co-60 Cr-51 Cs-134 03/23/04 2.4 +/- 4.3 -8.0+/- 19.0 0.0 +/- 2.3 1.3 +/- 2.6 -22.0 +/- 23.0 0.0 +/- 2.4 06/07/04 3.9 +/- 6.3 11.0+/- 35.0 -1.4 +/- 3.8 2.4 +/- 4.2 -22.0 +/- 36.0 -3.7 +/- 3.9 06/17/04 -4.1 +/- 4.6 11.0 4 22.0 -1.9 +/- 2.6 1.7 +/- 2.4 15.0+/- 24.0 -0.2 +/- 2.5 09/09/04 5.3+5.0 -25.0 +/- 25.0 -0.9 +/- 2.8 1.0 +/- 2.5 5.0 +/- 26.0 -0.7 +/- 2.8 12/13/04 -4.9+/-4.4 4.0+/- 12.0 -1.0+/-+IA 0.1 +/- 1.3 -1.0+/- 17.0 -1.1 +/- 1.3 Cs-137 Fe-59 11-3 1-131 K-40 La-140 03/23/04 -1.4 +/- 2.7 0.1+/- 7.9 H -3.4 +/- 4.4 -8.0 +/- 41.0 2.8 +/- 4.9 06/07/04 1.4 +/- 3.7 2.0+/- 10.0 540.0 +/- 740.0 1.9 +/- 7.2 37.0 +/- 63.0 4.4 +/- 7.2 06/17/04 -2.9 +/- 2.3 1.3 +/- 5.9 480.0 +/- 930.0 1.1+/- 5.5 39.0 +/- 28.0 -4.7 + 5.3 09/09/04 1.1 +/-2.3 5.5 +/- 6.8 -50.0 +/- 940.0 -1.5 +/- 5.5 -7.0 +/- 32.0 6.1 + 5.7 12/13/04 -0.8 +/- 1.2 -1.0+/- 4.0 600.0 +/- 870.0 0.8 +/- 8.5 -7.0 +/- 20.0 -5.7 +/- 5.0 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Sr-90 03/23/04 -0.6 +/- 2.3 -2.2+/- 2.9 -0.7 + 2.5 2.0 + 22.0 -3.0 +/- 6.3 1.3 +/- 1.1 06/07/04 -4.4+/- 3.7 -1.5 +/- 4.7 -2.7 +/-4.3 4.0 +/- 32.0 5.5 +/- 9.8 -0.3 +/- 1.0 06/17/04 1.3 +/- 2.3 1.8 +/- 2.9 -2.0 +/- 2.8 1.0 +/- 22.0 2.5 + 6.1 1.0+/- 1.1 09/09/04 -0.4 +/- 2.7 2.4 +/- 5.1 -0.1 +/- 3.0 -20.0 +/- 21.0 3.5 +/- 7.6 -0.1 +/- 0.9 12/13/04 0.0 + 1.3 1.0 +/- 2.3 -1.5 +/- 2.7 8.0+/- 12.0 -1.6 +/- 3.1 -0.2 +/- 0.9

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 10, Well Water (pCi/l) Page 2 of 2 Location Collection Isotope Date 71 Th-228 Zn-65 Zr-95 03/23/04 5.0+/- 12.0 7.4 +/- 9.1 0.2+/- 4.3 06/07/04 0.0: 16.0 12.0+/- 14.0 1.0:15.9 06/17/04 6.0+/- 11.0 6.0+/- 11.0 2.3+/-4.1 09/09/04 6.0+/- 10.0 11.0:1 14.0 2.4+/-4.6 12/13/04 -1.6 +/- 6.1 -1.3 +/- 2.9 1.2:+/- 2.7 72 Ba-140 Be-7 Co-58 Co-60 Cr-51 Cs-134 03/23/04 2.3 :13.3 6.0+ 19.0 0.5 + 2.2 -0.4 +/- 2.0 9.0 + 20.0 1.7+/-2.4 06/07/04 -2.9:1:4.3 -23.0 +/- 22.0 -2.8+/-2.3 1.8+/-2.5 13.0 + 26.0 0.6:1 2.8 06/17/04 0.0:1:4.1 -1.0 1:21.0 -1.7 +/- 2.6 1.2+/-2.5 32.0 +/- 23.0 0.01+/-2.7 09/08/04 0.0+/- 3.6 -15.0:1 18.0 -0.5 +/- 2.4 0.2+/-2.7 8.0 +/- 23.0 -0.7 +/- 2.6 12116/04 -2.7+/- 3.9 3.0 1 13.0 -1.6+/- 1.5 0.5 + 1.3 16.0+/- 15.0 -0.8 +/- IA Cs-137 Fe-59 II-3 1-131 K-40 La-140 03/23/04 0.6+/- 2.1 -2.7 +/- 5.3 H -0.2 +/- 4.0 16.0 +/- 37.0 2.6+/- 3.8 06/07/04 -1.8 +/- 2.8 1.4 +/- 6.6 70.0 +/- 720.0 -0.5 +/- 5.3 -17.0 +/- 35.0 -3.4 +/- 5.0 06/17/04 1.1 +/-2.3 0.5 +/- 5.8 760.0 +/- 800.0 -3.1 +/- 5.6 -28.0 +/- 35.0 0.0+/- 4.7 09/08/04 -0.1 +/- 2.1 6.0+/- 6.4 -20.0 +/- 930.0 2.3 +/- 5.8 -5.0 +/- 29.0 0.0 +/- 4.1 12/16/04 -0.6+/- 1.2 -1.8 +/- 3.7 350.0 +/- 870.0 -1.7 +/- 6.5 9.0 +/- 22.0 -3.1 +/- 4.5 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Sr-90 03/23/04 -0.4 +/- 2.2 0.5 +/- 2.5 -2.7 +/- 2.4 14.0+/- 19.0 -0.8+/-5.6 1.2 +/- 0.9 06/07/04 0.8 +/- 2.5 1.0+/- 2.7 0.6 +/- 2.6 24.0 +/- 23.0 -0.9 +/- 6.8 0.3 +/- 1.0 06/17/04 0.4 +/- 2.5 3.2 + 4.5 2.4 +/- 2.8 -10.0 +/- 22.0 0.8 +/- 6.1 1.5 +/- 1.1 09/08/04 0.6+/- 2.1 -0.9 +/- 3.8 -1.3 +/- 2.5 0.0 +/- 19.0 1.0 +/- 5.8 -0.3 +/- 0.9 12/16/04 1.0+/- 1.3 0.8 +/- 1.8 -1.7 +/- 2.8 3.0 +/- 12.0 0.5 +/- 3.3 -0.6 +/- 0.9 Thi-228 Zn-65 Zr-95 03/23/04 -2.7 +/- 7.8 -2.9 +/- 9.2 1.6 +/- 3.8 06/07/04 -0.3 4 9.8 -2.0+/- 11.0 -0.2 +/- 4.6 06/17/04 -9.9 +/- 9.3 8.3 +/- 9.9 1.1 +/-4.5 09/08/04 -1.4 +/- 9.3 7.0+/- 10.0 0.2 +/- 4.0 12/16/04 1.3 +/- 5.8 -1.3 +/- 4.4 1.8 +/- 2.6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 12, Fruits & Vegetables (pCi/g wet) Page l of 2 Location Collection Sample Type Isotope Date 25 Ba-140 Be-7 Ce-141 Ce-144 Co-58 06/15/04 LETTUCE -0.004 +/- 0.013 0.170 i 0.078 -0.008 +/- 0.008 0.012 +/- 0.026 0.000 +/- 0.006 06/15/04 STRAWBERRIES -0.005 i 0.010 -0.008 +/- 0.041 0.001 +/- 0.009 -0.023 i 0.023 0.001 +/- 0.005 09/13/04 SWISS CHARD -0.004 : 0.011 0.206 +/- 0.073 -0.006 +/- 0.008 0.010 +/- 0.028 -0.004 +/- 0.007 09/21/04 CABBAGE 0.013 +/- 0.019 -0.094 +/- 0.085 -0.009 +/- 0.015 -0.023 +/- 0.048 -0.005 +/-0.010 09/22/04 APPLES -0.024 +/- 0.020 -0.005 +/- 0.084 -0.023 +/- 0.016 0.006 +/- 0.050 0.001 +/- 0.010 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 06/15/04 LETTUCE 0.000 +/- 0.007 -0.015 +/- 0.058 0.001 +/- 0.006 0.000 +/- 0.006 -0.011 +/- 0.019 06/15/04 STRAWBERRIES 0.002 +/- 0.005 -0.007 +/- 0.051 0.003 +/- 0.005 -0.002 +/- 0.004 0.005 +/- 0.013 09/13/04 SWISS CHARD 0.005 +/- 0.008 0.002 +/- 0.058 0.002 +/- 0.007 -0.004 +/- 0.006 -0.006 +/- 0.020 09/21/04 CABBAGE -0.001 +/- 0.009 0.045 +/- 0.098 0.000 +/- 0.010 0.010 +/- 0.008 0.000 : 0.027 09/22/04 APPLES -0.003 + 0.012 0.050 +/- 0.110 -0.003 +/- 0.010 0.000 +/- 0.010 -0.003 +/- 0.033 1-131 K-40 La-140 Mn-54 Nb-95 06/15/04 LETTUCE 0.000 +/- 0.020 3.310 +/- 0.190 -0.005 +/-0.015 0.000 +/- 0.006 0.005 +/- 0.007 06/15/04 STRAWBERRIES -0.001 +/- 0.018 0.950 +/- 0.100 -0.006 +/- 0.011 -0.003 +/- 0.005 0.002 i 0.008 09/13/04 SWISS CHARD 0.018 i 0.028 3.910 +/- 0.270 -0.005 +/- 0.012 -0.006 +/- 0.006 0.004 +/- 0.011 09/21/04 CABBAGE -0.015 +/- 0.031 1.230 i 0.220 0.015 +/- 0.022 -0.001 +/- 0.008 -0.004 i 0.013 09/22/04 APPLES 0.001 +/- 0.032 0.490 +/- 0.200 -0.027 +/- 0.023 -0.002 +/- 0.010 0.004 +/- 0.013 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 06/15/04 LETTUCE -0.003 +/- 0.006 0.013 +/- 0.048 0.010 +/- 0.013 -0.001 +/- 0.030 0.004 +/- 0.013 06/15/04 STRAWBERRIES -0.008 +/- 0.006 -0.040 +/- 0.043 0.000 +/- 0.011 0.001 +/- 0.022 0.000 +/- 0.016 09/13/04 SWISS CHARD -0.005 +/-0.006 -0.019 +/- 0.051 0.005 +/-0.015 0.015 +/- 0.023 -0.001 +/- 0.030 09/21/04 CABBAGE 0.003 +/- 0.011 -0.041 +/- 0.090 -0.002 +/- 0.021 0.012 +/- 0.039 -0.022 +/- 0.020 09/22/04 APPLES 0.000 i 0.011 -0.043 +/- 0.087 0.030 +/- 0.027 0.024 +/- 0.039 0.000 +/- 0.026 Zr-95 06/15/04 LETTUCE 0.003 +/- 0.010 06/15/04 STRAWBERRIES 0.007 +/- 0.009 09/13/04 SWISS CHARD 0.000+/- 0.011 09/21/04 CABBAGE 0.003 1 0.018 09/22/04 APPLES 0.012 4 0.018 26-C Ba-140 Be-7 Ce-141 Ce-144 Co-58 06/14/04 LETTUCE 0.004 +/- 0.012 0.062 +/- 0.046 0.001 +/- 0.009 -0.001 +/- 0.019 -0.003 +/- 0.006 06/14/04 STRAWBERRIES 0.006 +/- 0.011 0.026 +/- 0.041 0.008 +/- 0.008 -0.022 +/- 0.023 0.000 +/-0.005 09/15/04 APPLES -0.008 +/- 0.021 -0.040 +/- 0.140 -0.010 +/- 0.022 -0.051 +/- 0.077 -0.004 +/- 0.015 09/15/04 CABBAGE 0.007 +/- 0.021 0.050 +/-0.100 -0.025 +/- 0.016 -0.024 +/- 0.054 -0.003 +/- 0.015 Co-60 Cr-51 Cs-134 Cs-137 Fe-59 06/14/04 LETTUCE -0.001 +/- 0.007 -0.027 + 0.047 0.000 +/- 0.006 0.001 +/-0.005 0.000 +/- 0.020 06/14/04 STRAWBERRIES 0.000 +/- 0.004 -0.038 +/- 0.052 -0.001 +/- 0.005 0.004 +/- 0.005 -0.007 +/- 0.014 09/15/04 APPLES -0.003 +/- 0.018 0.040 +/- 0.150 0.009 +/- 0.016 -0.006 +/- 0.017 -0.026 + 0.047 09/15/04 CABBAGE 0.006 +/- 0.019 -0.100 +/- 0.120 -0.006 +/- 0.016 -0.003 +/- 0.013 0.005 +/- 0.047 I-131 K-40 La-140 Mn-54 Nb-95 06/14/04 LETTUCE -0.005 +/- 0.018 3.060 +/- 0.190 0.004 +/- 0.014 -0.003 +/- 0.005 0.001 +/- 0.007 06/14/04 STRAWBERRIES -0.014 + 0.020 1.150 +/-0.110 0.007 +/- 0.013 0.003 +/- 0.004 -0.002 +/- 0.006 09/15/04 APPLES 0.016 +/- 0.027 0.800 +/- 0.320 -0.010 +/- 0.025 0.002 +/- 0.014 0.000 +/- 0.020 09/15/04 CABBAGE -0.017 +/- 0.016 1.800 +/- 0.480 0.008 +/- 0.024 0.006 +/- 0.012 0.008 +/- 0.016 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 06/14/04 LETTUCE -0.003 +/- 0.006 -0.014 +/- 0.044 0.004 +/- 0.011 0.002 +/- 0.026 0.007 +/- 0.013 06/14/04 STRAWBERRIES -0.006 +/- 0.005 -0.022 +/- 0.041 -0.004 +/- 0.012 -0.012 +/- 0.022 -0.004 +/- 0.010

Dominion Nudear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 12, Fruits & Vegetables (pCilg wet) Page 2 of 2 Location Collection Sample Type Isotope Date 26-C Ru-103 Ru-106 Sb-125 Th-228 Zn-65 09/15/04 APPLES -0.017 +/- 0.016 0.100+/- 0.150 -0.002 +/- 0.043 -0.020 + 0.067 0.019 i 0.077 09/15/04 CABBAGE -0.008 +/- 0.013 0.020 +/- 0.120 -0.008 +/- 0.039 -0.046 +/- 0.059 -0.014 +/- 0.039 Zr-95 06/14/04 LETTUCE -0.001 +/- 0.010 06/14/04 STRAWBERRIES -0.009 +/- 0.008 09/15/04 APPLES 0.002 +/- 0.028 09/15/04 CABBAGE 0.017 +/- 0.023

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 13, Broadleaf Vegetation (pCi/g wet) Page l of 2 Location Collection Isotope Date 01 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 05/19/04 0.000 +/- 0.038 0.970 + 0.320 -0.024 + 0.027 0.003 +/- 0.092 -0.002 + 0.022 -0.010 + 0.023 06/09/04 0.000 +/- 0.038 0.280 0.320 -0.022 0.034 -0.020 +/- 0.110 0.003 0.027 0.011 + 0.024 07/27/04 -0.005 + 0.022 0.320 i 0.230 -0.007 + 0.021 -0.010 + 0.062 0.008 i 0.021 -0.005 + 0.024 08/25/04 -0.008 + 0.035 0.230 + 0.180 0.009 + 0.034 -0.078 +/- 0.076 0.017 +/- 0.018 0.009 +/- 0.022 09/15/04 0.038 + 0.045 1.010 + 0.400 -0.029 b 0.033 0.020 +/- 0.110 0.000 +/- 0.026 0.011 i 0.027 10/06/04 0.013 + 0.054 0.840 + 0.300 0.003 i 0.039 -0.034 + 0.089 -0.014 +/- 0.022 -0.002 + 0.021 Cr-51 Cs-134 Cs-137 Fe-59 I-131 K-40 05/19/04 -0.060 +/- 0.200 0.018 +/- 0.023 0.003 +/- 0.018 0.047 + 0.061 -0.021 +/- 0.052 3.630 +/- 0.750 06/09/04 0.110 + 0.280 -0.008 +/- 0.030 0.003 +/- 0.025 -0.035 + 0.087 0.016 +/- 0.069 2.810 +/- 0.760 07/27/04 0.000 +/- 0.130 0.005 : 0.024 0.018 + 0.019 -0.040 + 0.070 -0.028 +/- 0.029 3.520 +/- 0.710 08/25/04 -0.110 + 0.160 -0.002 + 0.021 0.012 +/- 0.018 -0.015 +/- 0.049 0.013 +/- 0.053 3.740 +/- 0.540 09/15/04 -0.020 +/- 0.220 0.000 i 0.024 0.007 +/- 0.025 -0.034 +/- 0.060 0.024 +/- 0.065 1.630 +/- 0.670 10/06/04 0.100 +/- 0.260 -0.002 +/- 0.021 0.021 + 0.023 0.061 + 0.059 -0.056 +/- 0.095 3.100 + 0.600 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 05/19/04 0.000 +/- 0.043 0.000 +/- 0.023 -0.010 +/- 0.028 0.010 + 0.021 -0.120 +/- 0.200 -0.031 + 0.050 06/09/04 0.000 +/- 0.044 0.032 + 0.028 0.021 +/- 0.032 -0.004 i 0.028 -0.190 + 0.260 0.039 + 0.049 07/27/04 -0.006 + 0.026 0.006 +/- 0.020 0.013 +/- 0.021 0.000 + 0.019 -0.130 +/- 0.150 0.032 +/- 0.048 08/25/04 -0.009 +/- 0.040 -0.005 + 0.018 -0.004 +/- 0.023 0.005 + 0.018 0.020 + 0.150 0.005 +/- 0.045 09/15/04 0.044 + 0.052 -0.003 i 0.024 0.002 + 0.032 0.002 +/- 0.027 -0.110 +/- 0.230 -0.037 +/- 0.064 10/06/04 0.015 : 0.062 -0.015 + 0.019 0.007 +/- 0.029 0.004 +/- 0.024 -0.280 +/- 0.190 0.012 +/- 0.047 Th-228 Zn-65 Zr-95 05/19/04 -0.012 t 0.098 -0.036 1 0.050 -0.004 + 0.037 06/09/04 0.074 + 0.096 -0.125 i 0.081 0.032 +/- 0.050 07/27/04 0.011 +/- 0.071 -0.014 + 0.053 -0.009 +/- 0.032 08/25/04 0.088 + 0.078 0.055 + 0.083 0.029 +/- 0.032 09/15/04 0.028 +/- 0.093 -0.039 + 0.072 0.000 + 0.054 10/06/04 0.024 +/- 0.087 -0.026 + 0.053 -0.012 +/- 0.042 10 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 05/19/04 0.023 + 0.023 0.360 + 0.150 -0.007 +/- 0.012 0.010 + 0.041 -0.006 + 0.014 0.002 +/- 0.012 06/09/04 0.007 +/- 0.025 0.340 +/- 0.210 -0.009 +/- 0.018 0.025 +/- 0.051 0.003 + 0.013 0.011 +/- 0.023 07/27/04 0.000 +/- 0.023 0.130 + 0.200 -0.004 +/- 0.018 -0.044 +/- 0.071 0.009 + 0.018 0.008 +/- 0.024 08/25/04 0.028 + 0.034 0.120 +/- 0.160 0.011 +/- 0.019 -0.062 + 0.053 -0.007 +/- 0.017 0.004 +/- 0.020 09/21/04 0.013 +/- 0.029 0.750 +/- 0.240 -0.025 + 0.025 0.031 + 0.085 0.012 +/- 0.017 0.002 + 0.022 10/06/04 0.000 +/- 0.050 0.310 + 0.260 0.017 +/- 0.027 0.023 +/- 0.072 -0.021 + 0.027 -0.007 +/- 0.027 Cr-51 Cs-134 Cs-137 Fe-59 1-131 K-40 05/19/04 0.040 + 0.110 -0.010 + 0.013 0.014 +/- 0.015 -0.035 +/- 0.050 -0.001 + 0.027 2.590 + 0.570 06/09/04 0.050 +/-0.110 0.001 + 0.017 0.015 +/- 0.020 -0.043 +/- 0.065 -0.020 +/- 0.039 1.360 +/- 0.480 07/27/04 -0.010 : 0.180 -0.003 +/- 0.028 -0.006 + 0.021 -0.086 +/- 0.092 0.002 +/- 0.035 3.060 +/- 0.850 08/25/04 0.040 t 0.140 -0.019 + 0.021 -0.001 + 0.018 -0.065 +/- 0.069 -0.016 + 0.041 3.690 +/- 0.620 09/21/04 0.050 +/-0.150 -0.004 +/- 0.019 0.005 + 0.016 0.002 t 0.052 0.012 +/- 0.050 3.490 + 0.590 10/06/04 0.020 : 0.160 0.003 +/- 0.022 0.007 +/- 0.026 -0.022 + 0.088 0.008 +/- 0.066 2.100 + 0.690

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 13, Broadleaf Vegetation (pCi/g wet) Page 2 of 2 Location Collection Isotope Date 10 La-140 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 05/19/04 0.026 +/- 0.026 0.002 +/- 0.012 0.000 +/- 0.016 -0.001 +/- 0.013 0.000 h 0.092 -0.021 +/- 0.024 06/09/04 0.008 +/- 0.028 -0.003 +/- 0.020 -0.008 +/- 0.021 -0.007 +/- 0.015 -0.050 +/-0.160 -0.018 +/- 0.043 07/27/04 0.000 +/- 0.027 -0.027 +/- 0.027 0.005 +/- 0.032 -0.019 +/- 0.021 -0.210 +/- 0.180 -0.049 +/- 0.054 08/25/04 0.032 +/- 0.039 -0.008 +/- 0.017 -0.012 +/- 0.025 0.006 +/- 0.018 -0.010 +/- 0.130 -0.040 +/- 0.036 09/21/04 0.015 +/- 0.034 -0.015 +/- 0.017 -0.005 +/- 0.024 0.006 +/- 0.019 -0.060 +/- 0.180 0.025 +/- 0.045 10/06/04 0.000 +/- 0.057 -0.010 +/- 0.025 0.011 +/- 0.030 0.010 +/- 0.026 0.040 +/- 0.160 -0.024 +/- 0.048 Th-228 Zn-65 Zr-95 05/19104 0.021 +/- 0.054 0.000+/- 0.031 0.001 +/- 0.021 06/09/04 0.018 +/- 0.046 -0.011 +/- 0.045 0.004 +/- 0.030 07/27/04 0.024 +/- 0.085 0.000 +/- 0.055 0.019 +/- 0.036 08/25/04 -0.010 +/- 0.067 0.043 +/- 0.082 -0.007 +/- 0.033 09/21/04 0.071 +/- 0.080 0.012 +/- 0.050 0.008 +/- 0.034 10/06/04 0.024 +/- 0.087 -0.014 +/- 0.050 -0.031 +/- 0.050 17 Ba-140 Be-7 Ce-141 Ce-144 Co-58 Co-60 05/19/04 0.009 +/- 0.045 0.450 +/- 0.230 0.010 +/- 0.019 0.020 +/- 0.059 -0.001 +/- 0.015 -0.001 +/- 0.021 06/09/04 0.026 +/- 0.067 0.310 +/- 0.290 -0.020 +/- 0.034 -0.050 +/- 0.110 0.006 + 0.028 0.021 +/- 0.033 07/27/04 -0.005 +/- 0.034 0.410 +/- 0.220 0.002 +/- 0.019 -0.004 +/- 0.062 -0.011 +/- 0.024 0.028 +/- 0.027 08/25/04 -0.018 +/- 0.034 0.950 +/- 0.280 -0.033 + 0.028 0.009 +/- 0.083 -0.009 +/- 0.019 -0.013 +/- 0.021 09/15/04 0.008 +/- 0.046 0.570 +/- 0.270 -0.010 +/- 0.024 0.009 +/- 0.073 0.011 +/- 0.019 -0.022 +/- 0.027 10/06/04 -0.016 +/- 0.071 2.230 +/- 0.390 -0.017 +/- 0.028 0.037 +/- 0.069 0.006 + 0.023 0.004 +/- 0.030 Cr-51 Cs-134 Cs-137 Fe-59 I-131 K-40 05/19/04 -0.050 +/- 0.150 0.008 +/- 0.013 0.019 +/- 0.019 0.004 +/- 0.076 -0.002 +/- 0.040 3.390 +/- 0.770 06/09/04 -0.180 +/- 0.250 0.027 +/- 0.031 0.016 +/- 0.024 0.026 +/- 0.065 0.000 +/- 0.080 1.860 +/- 0.660 07/27/04 0.100 +/- 0.150 -0.011 +/- 0.024 0.048 +/- 0.029 0.015 +/- 0.069 0.016 +/- 0.031 2.080 +/- 0.630 08/25/04 -0.040 +/- 0.210 0.000 +/- 0.021 0.051 +/- 0.028 -0.031 +/- 0.063 -0.034 +/- 0.061 2.060 +/- 0.520 09/15/04 -0.120+/- 0.140 0.012+/- 0.027 0.002+/- 0.020 -0.005 +/- 0.059 0.003 +/- 0.038 3.440+/- 0.750 10/06/04 -0.030 +/- 0.180 -0.003 +/- 0.024 -0.009 +/- 0.022 0.014 +/- 0.079 -0.002 +/- 0.075 2.050 +/- 0.550 La-140 NMn-54 Nb-95 Ru-103 Ru-106 Sb-125 05/19/04 0.010 +/- 0.052 0.006 +/- 0.018 0.014 +/- 0.019 0.003 +/- 0.018 -0.160 +/- 0.170 -0.014 +/- 0.037 06/09/04 0.030 +/- 0.077 0.022 +/- 0.028 0.020 +/- 0.036 0.015 +/- 0.031 -0.200 +/- 0.210 -0.016 +/- 0.052 07/27/04 -0.006 +/- 0.039 0.008 +/- 0.020 -0.018 +/- 0.025 -0.016 +/- 0.021 -0.040 +/- 0.130 0.017 +/- 0.046 08/25/04 -0.021 +/- 0.039 0.003 t 0.019 0.011 +/- 0.026 0.002 +/- 0.024 0.050 +/- 0.190 0.038 +/- 0.050 09/15/04 0.009+/- 0.053 0.001 0.024 -0.002 +/- 0.027 0.004 +/- 0.019 -0.040 +/- 0.150 -0.025 +/- 0.047 10/06/04 -0.018 +/- 0.082 -0.003 +/- 0.021 0.012 +/- 0.029 0.016 +/- 0.023 -0.070 +/- 0.160 -0.009 +/- 0.049 Th-228 Zn-65 Zr-95 05/19/04 0.049 +/- 0.072 -0.007 +/- 0.041 -0.025 +/- 0.037 06/09/04 0.049 +/- 0.094 -0.105 +/- 0.075 0.041 +/- 0.044 07/27/04 0.028 + 0.082 -0.010 + 0.044 -0.028 +/- 0.036 08/25/04 -0.045 +/- 0.065 -0.039 +/- 0.051 0.005 +/- 0.036 09/15/04 0.010 +/- 0.094 -0.025 +/- 0.056 0.027 +/- 0.049 10/06/04 -0.028 +/- 0.089 -0.018 +/- 0.050 0.004 +/- 0.044

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 14, Sea Water (pCilL) Page 1 of 2 Location Collection Isotope Date 32 Ba-140 Be-7 Co-58 Co-60 Cr-51 Cs-134 01/27/04 1.6+/- 2.9 -7.0 +/- 17.0 -1.5 +/- 2.0 -1.9 +/- 2.6 6.0+/- 19.0 1.6 +/- 2.1 02/24/04 0.0+/-3.0 0.0+/- 19.0 -2.1 +/- 2.0 1.5 +/- 1.8 -2.0+/- 19.0 1.4 2.4 03/30/04 1.8+/-4.1 18.0 +/- 21.0 0.2 +/- 2.2 1.6 +/- 2.8 18.0+/- 23.0 -1.8 +/- 2.3 04/27/04 0.5+/-3.0 -19.0+/- 19.0 -1.2 +/- 2.3 -1.9 +/- 2.5 3.0 +/- 24.0 0.0 +/- 2.1 05/25/04 -2.9+/-4.1 0.0 +/- 17.0 0.6+/- 1.7 -2.0 +/- 1.9 18.0+/- 21.0 1.1 +/- 1.7 06/29/04 -1.5 +/- 4.2 -1.0 + 23.0 -1.2 +/- 2.5 -1.2 +/- 2.7 4.0 +/- 28.0 0.2 +/- 2.9 07/27/04 0.0+/-4.2 -4.0+/- 17.0 -1.1 + 1.9 0.5 +/- 2.3 20.0 +/- 23.0 -0.7 +/- 1.9 08/31/04 0.0+/-4.5 8.0 +/- 14.0 -0.5 + 1.8 -0.3 +/- 2.1 -5.0 +/- 19.0 -1.5 +/- 2.2 09/28/04 0.5 +/- 2.6 -2.0 +/- 14.0 -0.9 + 1.5 0.4 +/- 1.9 -5.0 +/- 18.0 0.6 +/- 2.0 10/26/04 -2.4 +/- 4.5 -12.0 +/- 26.0 0.2 +/- 2.5 -1.2 +/- 1.8 3.0 +/- 26.0 0.2 +/- 2.3 11/30/04 0.4+/-2.6 7.0 +/- 20.0 -0.4+/- 2.4 -1.5 +/- 1.9 12.0 +/- 23.0 0.0 +/- 2.4 12/28/04 -1.1 +/-5.8 -3.0+/- 18.0 0.1 +2.4 0.4 +/- 2.6 -16.0 + 24.0 -1.0 +/- 2.5 Cs-137 Fe-59 H-3 I-131 K40 La-140 01/27/04 -0.2 +/- 2.2 -3.1 +/- 6.0 380.0 180.0 1.8 +/- 4.1 285.0 +/- 55.0 1.8 3.3 02/24/04 -0.5 +/- 1.8 -0.7 +/- 4.9 1000.0 190.0 3.1 +/- 3.8 302.0 +/- 55.0 0.0 3.4 03/30/04 -0.2 +/- 2.8 -2.3 +/- 6.7 1660.0 +/- 180.0 0.0+/- 4.5 273.0 +/- 67.0 2.1+/- 4.7 04/27/04 -0.2 +/- 2.4 5.0 +/- 6.6 980.0 +/- 230.0 -5.9+/- 5.0 255.0 + 56.0 0.5 3.4 05/25/04 0.3 +/- 1.9 1.3 +/- 5.6 220.0+/- 190.0 -0.7 +/- 5.5 315.0 +/- 50.0 -3.4 4.7 06/29/04 -2.6 +/- 2.9 7.7 +/- 6.2 1050.0+/- 180.0 0.5 +/- 5.4 290.0 +/- 64.0 -1.7+/- 4.9 07/27/04 -0.2 +/- 2.4 -0.1 +/- 6.8 180.0+/- 170.0 -0.8 +/- 5.2 300.0 +/- 58.0 0.0 +/- 4.8 08/31/04 -1.0+/- 1.9 3.2 +/- 5.5 190.0 +/- 180.0 4.7+/- 5.8 21.0 +/- 33.0 0.0 +/- 5.2 09/28/04 -0.3 +/- 1.7 -3.6 +/- 5.2 -30.0+/- 130.0 1.4 +/- 3.5 320.0 +/- 46.0 0.6 +/- 3.0 10/26/04 0.1+/- 2.4 1.0 +/- 7.5 108.0 +/- 82.0 0.0 +/- 7.3 264.0 +/- 67.0 -2.8 +/- 5.2 11/30/04 0.0 +/- 2.4 -2.8 +/- 6.7 243.0 +/- 86.0 3.2 +/- 4.5 283.0 +/- 59.0 0.4 +/- 3.0 12/28/04 -1.2 +/- 2.9 2.4 +/- 8.4 480.0 +/- 210.0 2.3 +/- 7.3 285.0 +/- 62.0 -1.3 + 6.7 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 01/27/04 0.3 +/- 1.9 -0.4 +/- 2.2 0.8 +/- 2.2 10.0+/- 18.0 3.6 +/- 5.5 -0.9 +/- 9.7 02/24/04 -1.0 +/- 1.8 0.3 2.4 1.1+/- 2.4 20.0 +/- 20.0 1.5 +/- 5.7 -3.5 +/- 8.6 03/30/04 1.1 +/- 2.3 -0.6 2.4 -1.1 +/- 2.6 10.0 +/- 19.0 1.9 +/- 6.4 -3.7 +/- 8.4 04/27/04 -1.1 +/- 2.1 0.6 2.4 -1.4 +/- 2.3 10.0 +/- 21.0 2.8 +/- 5.8 5.2 +/- 7.7 05/25/04 -0.7 +/- 1.5 -0.9 +/- 2.2 -1.9 +/- 2.0 1.0 16.0 -0.2 +/- 5.1 6.7 +/- 5.8 06/29/04 -0.4 +/- 2.5 -0.3 2.9 0.3 +/- 3.0 14.0 +/- 22.0 -1.7 +/- 7.6 -2.6+/- 8.7 07/27/04 -0.4 +/- 2.2 0.1 2.6 -0.3 +/- 2.5 3.0 +/- 22.0 1.7+/- 5.0 3.0+/- 8.3 08/31/04 0.1 +/- 1.5 -0.1+/- 2.4 0.5 +/- 2.0 -8.0+/- 17.0 -1.0 +/- 4.1 -1.5 +/- 9.9 09/28/04 -0.7 +/- 1.7 -0.4+/- 1.9 -1.1 +/- 1.7 0.0 +/- 14.0 4.0 +/- 4.6 6.2 +/- 6.0 10/26/04 -0.2 +/- 2.5 0.3 3.1 -1.8 +/- 3.3 -8.0 +/- 25.0 2.8 +/- 6.0 8.2 +/- 9.2 11/30/04 -0.3 +/- 2.2 -0.5 2.8 -1.2 +/- 2.7 17.0 21.0 -2.9 +/- 5.5 4.2 +/- 7.7 12/28/04 1.1+/- 2.4 -0.7 +/- 2.9 -1.0+/- 2.6 4.0 +/- 22.0 -4.7 +/- 6.0 3.3 +/- 7.9 Zn-65 Zr-95 01/27/04 -6.8 +/- 4.6 -1.1 +/- 3.6 02/24/04 1.4 +/- 5.2 1.3 +/- 3.6 03/30/04 -3.8 +/- 5.5 -1.0 +/-4.2 04/27/04 -1.8 +/- 5.1 -2.3 +/- 3.8 05/25/04 -3.6 4.6 -3.2 + 3.0 06/29/04 -1.6 +/-6.3 -1.6+/- 4.9 07/27/04 -5.1 4.7 -0.9 +/- 3.9 08/31/04 1.9 3.7 1.4 + 3.3 09/28/04 0.2 3.5 0.3 +/- 2.9 10/26/04 3.6 +/- 5.6 -2.9 + 4.6 11/30/04 9.3 8.9 0.6 + 4.1 12/28/04 -2.3 +/-4.9 3.4 +/- 4.8

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 14, Sea Water (pCi/L) Page 2 of 2 Location Collection Isotope Date 37-C Ba-140 Be-7 Co-58 Co-60 Cr-51 Cs-134 03/09/04 1.8+/-4.7 5.0 +/- 20.0 -1.4+/-2.2 0.3+/-2.1 19.0 +/- 23.0 0.3 +/- 2.3 06/08/04 2.0+/-3.5 4.0+/- 16.0 -1.8+/- 1.9 0.2 +/- 1.6 12.0 +/- 21.0 -0.1 +/- 1.6 09/07/04 1.0+/-3.4 0.0+/- 14.0 -1.3 +/- 1.9 0.8+/-2.5 3.0 + 15.0 0.2+/-2.1 11/16/04 3.8+/-5.9 16.0 +/- 25.0 -1.3+/-2.6 1.4+3.0 -3.0 + 28.0 0.2+/-2.8 Cs-137 Fe-59 11-3 1-131 K-40 La-140 03/09/04 -1.8 +/- 2.0 -2.6+/- 6.4 150.0 +/- 840.0 -8.0 +/- 7.6 265.0 +/- 55.0 2.0 +/- 5.4 06/08/04 -2.8 +/- 1.8 1.9 +/-4.8 240.0 i 920.0 1.3:1:6.5 241.0 +/- 36.0 2.3 +/-4.0 09/07/04 0.1 +/- 1.8 2.4+/-4.8 40.0+/- 170.0 0.8 +/-:3.0 -18.0 +/- 34.0 1.2+/-3.9 11/16/04 -1.3 +/- 3.1 -0.5 +/- 8.9 -430.0 +/- 670.0 -4.7+/-17.5 337.0+ 74.0 4.4+/-6.8 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 Th-228 03/09/04 -2.0 +/- 1.9 -1.4 +/- 2.5 -1.31+/-2.5 18.0+/-21.0 0.3 +/-5.0 0.2+/-7.5 06/08/04 0.5 + 1.5 1.3+/-3.3 0.0 +/- 1.9 5.0+/- 14.0 -1.1 + 5.1 1.6+/- 5.8 09/07/04 -0.4:1:2.0 0.2+/-2.6 -1.6 : 2.0 -1.01 16.0 2.3+/-5.0 3.2 +/- 9.6 11/16/04 -1.4+/-2.5 -1.9+/- 3.3 1.5+3.0 -15.0 : 23.0 0.0 + 6.3 -6.0 +/- 11.0 Zn-65 Zr-95 03/09/04 -0.4+/-4.4 -5.5+/-4.4 06/08/04 12.0 +/- 8.0 -2.4+/-3.0 09/07/04 0.0+/- 4.3 -0.3143.6 11/16/04 -7.2 +/- 6.4 2.1+/-4.6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 15, Bottom Sediment (pCi/g dry) Page I of 4 Location Collection Isotope Date 29 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 07/20/04 0.011 +/- 0.031 0.280 + 0.250 -0.022 + 0.024 0.021 +/- 0.025 0.210 +/- 0.260 -0.005 +/- 0.024 12/09/04 0.006 +/- 0.020 0.300 : 0.260 -0.019 +/- 0.020 0.004 +/- 0.013 -0.230 +/- 0.280 0.030 +/- 0.054 Cs-137 Fe-59 I-131 K-40 Mn-54 Nb-95 07/20/04 0.030 +/- 0.027 -0.044 i 0.054 0.076 + 0.075 13.040 + 0.890 -0.003 + 0.024 -0.018 +/- 0.030 12/09/04 0.028 +/- 0.018 0.013 +/- 0.049 0.040 +/- 0.290 15.150 +/- 0.580 -0.007 + 0.012 -0.032 + 0.042 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 07/20/04 -0.010 +/- 0.024 0.030 +/- 0.220 0.047 +/- 0.059 0.950 i 0.100 0.080 +/- 0.110 -5.400 +/- 5.400 12/09/04 -0.008 +/- 0.025 0.040

  • 0.140 -0.008 +/- 0.040 1.138 +/- 0.063 -0.057 + 0.072 0.040 +/- 0.170 31 Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 05/04/04 0.006 +/- 0.027 0.040 +/- 0.220 -0.001 +/- 0.023 0.012 +/- 0.022 0.030 +/- 0.280 0.048 +/- 0.085 11/09/04 0.020 +/- 0.042 0.060 +/- 0.360 0.006 +/- 0.035 0.008 + 0.025 -0.150
  • 0.420 -0.003 +/- 0.032 Cs-137 Fe-59 I-131 K-40 Mn-54 Nb-95 05/04/04 -0.013 +/- 0.028 -0.029 + 0.067 -0.008 + 0.053 12.970 + 0.770 -0.013 +/- 0.019 -0.014 +/- 0.030 11/09/04 -0.027 + 0.037 -0.010 + 0.069 -0.060 +/- 0.110 12.820 + 0.970 -0.014 + 0.041 0.024 + 0.047 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 05/04/04 0.001 +/- 0.024 0.100
  • 0.230 0.000 +/- 0.074 2.720 + 0.120 0.000 i 0.100 0.190 +/- 0.210 11/09/04 -0.009 + 0.044 -0.330 +/- 0.330 0.054 +/- 0.096 4.210 +/- 0.190 -0.060 + 0.120 0.240
  • 0.450 32 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 02/24/04 -0.005 + 0.025 0.020 +/- 0.150 -0.012 +/- 0.017 0.024 +/- 0.021 0.030 +/- 0.170 0.023 +/- 0.072 05/25/04 -0.003 +/- 0.025 0.030 +/- 0.150 -0.007 +/- 0.019 0.019 +/- 0.020 -0.030 +/- 0.200 -0.045 +/- 0.073 07/20/04 -0.008 +/- 0.034 -0.050 +/- 0.230 0.022 +/- 0.029 -0.003 +/- 0.030 -0.150 +/- 0.260 0.000 +/- 0.023 12/09/04 0.015 +/- 0.029 0.120 +/- 0.280 -0.002 +/- 0.032 0.007 +/- 0.028 -0.150 i 0.360 -0.005 +/- 0.019 Cs-137 Fe-59 I-131 K-40 Mn-54 Nb-95 02/24/04 -0.004 +/- 0.022 0.012 4 0.040 0.000 4 0.035 12.910 +/- 0.790 0.017
  • 0.019 -0.010 i 0.020 05/25/04 -0.009 i 0.022 -0.049 +/- 0.046 0.027 +/- 0.056 7.830 +/- 0.730 0.014 i 0.018 0.022 + 0.038 07/20/04 0.020 + 0.029 -0.028 +/- 0.068 0.046 +/- 0.072 15.700 +/- 1.100 0.020 +/- 0.030 -0.047 +/- 0.042 12/09/04 0.016 +/- 0.026 -0.036 +/- 0.081 -0.150 +/- 0.350 12.300 + 0.970 0.015 i 0.025 -0.009 + 0.059 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/24/04 -0.004 +/- 0.018 -0.020 +/- 0.180 0.033 +/- 0.048 0.690 +/- 0.077 0.087 i 0.088 -0.051 4 0.075 05/25/04 -0.009 +/- 0.020 -0.030 +/- 0.160 -0.011 +/- 0.049 0.478 +/- 0.083 0.050 +/- 0.090 -3.800 +/- 4.900 07/20/04 -0.017 i 0.028 0.030 +/- 0.220 0.056 +/- 0.067 1.190
  • 0.110 0.050 +/- 0.140 -7.300 +/- 3.500 12/09/04 -0.003 + 0.035 0.310 +/- 0.220 -0.011 + 0.060 0.990 i 0.100 0.010 +/- 0.130 -6.200 +/- 6.600 33

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 15, Bottom Sediment (pCilg dry) Page 2 of 4 Location Collection Isotope Date 33 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 05/05/04 0.003 +/- 0.028 0.180 +/- 0.150 0.000 +/- 0.023 0.012 +/- 0.023 0.000 +/- 0.140 -0.003 +/- 0.017 10/27/04 -0.006 +/- 0.029 -0.070 +/- 0.200 0.003 +/- 0.022 0.001 +/- 0.028 -0.080 +/- 0.220 -0.008 +/- 0.029 Cs-137 Fe-59 I-131 K-40 AMn-54 Nb-95 05/05/04 0.002 +/- 0.020 0.009 +/- 0.055 -0.019 +/- 0.028 16.900 +/- 1.100 -0.007 +/- 0.020 0.000 +/- 0.039 10/27/04 -0.007 +/- 0.022 0.044 +/- 0.060 0.037 +/- 0.051 13.800 +/- 1.100 -0.003 +/- 0.024 -0.003 +/- 0.024 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 05/05/04 0.003 +/- 0.018 -0.080 +/- 0.180 -0.035 4 0.052 0.207 +/- 0.081 -0.019 +/- 0.062 -0.056 +/- 0.056 10/27/04 -0.005 +/- 0.023 0.120 +/- 0.190 0.018 +/- 0.048 0.204 +/- 0.097 -0.035 +/- 0.061 -0.048 +/- 0.056 34 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 05/05/04 0.002 +/- 0.021 0.060 4 0.140 -0.009 +/- 0.016 -0.001 +/- 0.016 0.020 +/- 0.150 0.008 +/- 0.061 10/27/04 -0.015 +/- 0.034 0.170 +/- 0.210 0.003 +/- 0.022 0.036 +/- 0.026 0.020 +/- 0.200 0.012 +/- 0.023 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 05/05/04 0.009 +/- 0.017 -0.005 +/- 0.038 0.012 4 0.026 16.350 +/- 0.850 -0.006 +/- 0.016 -0.003 +/- 0.018 10/27/04 -0.004 +/- 0.023 -0.027 +/- 0.063 0.000 +/- 0.055 13.200 +/- 1.200 0.015 +/- 0.023 -0.019 +/- 0.026 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 05/05/04 0.003 + 0.018 -0.100 0.150 -0.027

  • 0.041 0.205 +/- 0.065 -0.068 +/- 0.050 -0.041 +/- 0.035 10/27/04 0.020 i 0.021 -0.100 0.190 -0.028
  • 0.053 0.110 +/- 0.110 -0.070 +/- 0.066 -0.049 +/- 0.058 35-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 02/24/04 -0.008 +/- 0.029 0.130 +/- 0.190 0.000 +/- 0.024 0.000 +/- 0.026 -0.090 +/- 0.180 0.001 +/- 0.020 05/25/04 -0.005 +/- 0.030 0.100 +/- 0.240 -0.019 4 0.021 0.003 +/- 0.026 -0.280 +/- 0.280 0.019 +/- 0.021 07/20/04 0.014 + 0.039 0.000 +/- 0.240 -0.020
  • 0.025 0.022 +/- 0.032 0.170 +/- 0.300 0.014 +/- 0.025 12/09/04 0.034 + 0.041 0.090+/- 0.310 -0.031
  • 0.033 0.011 +/- 0.029 0.180 +/- 0.450 -0.003 +/- 0.025 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 02/24/04 0.040 +/- 0.032 -0.044
  • 0.055 0.032 +/- 0.038 14.300+/- 1.000 0.013 +/- 0.026 -0.015 +/- 0.031 05/25/04 0.039 +/-: 0.028 0.017
  • 0.054 0.040 +/- 0.068 9.540 +/- 0.950 0.003 +/- 0.024 -0.005 +/- 0.030 07/20/04 0.037 + 0.035 0.019
  • 0.070 -0.064
  • 0.095 14.100 +/- 1.100 0.022 +/- 0.027 -0.016 +/- 0.037 12/09/04 0.006 :+/- 0.031 0.015
  • 0.088 0.100
  • 0.420 13.600 +/- 1.100 -0.004 +/- 0.026 -0.029 +/- 0.051 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/24/04 0.012 +/- 0.021 -0.050 +/- 0.190 -0.002
  • 0.062 0.790 +/- 0.092 0.036 +/- 0.060 -4.700 i 4.300 05/25/04 -0.006 +/- 0.028 -0.070 +/- 0.240 0.000
  • 0.064 0.500 +/- 0.100 0.010 +/- 0.120 -0.084
  • 0.088 07/20/04 0.026 +/- 0.032 -0.040 +/- 0.270 0.036 +/- 0.067 0.870 +/- 0.120 0.090 0.140 -0.130 0.100 12/09/04 0.033 i 0.039 0.080 +/- 0.250 -0.003 +/- 0.069 0.850 +/- 0.110 -0.020
  • 0.140 -10.300 +/- 8.200 36-X

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Stalion 2004 Table 15, Bottom Sediment (pCi/g dry) Page 3 of 4 Location Collection Isotope Date 36-X Ag-llOm Be-7 Co-58 Co-60 Cr-51 Cs-134 05/04/04 -0.026 i 0.024 0.140 i 0.160 -0.007

  • 0.020 -0.005 I 0.019 0.240 +/- 0.170 0.009 + 0.017 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 05/04/04 0.004 +/- 0.019 -0.024
  • 0.048 0.005 +/- 0.032 16.400+/- 0.920 0.003 +/- 0.018 -0.023 +/- 0.022 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 05/04/04 0.006* 0.018 -0.100
  • 0.180 -0.032 +/- 0.046 0.311 + 0.078 -0.034 + 0.094 -0.009
  • 0.045 37-C Ag-llOm Be-7 Co-58 Co-60 Cr-51 Cs-134 05/04/04 0.010 +/- 0.036 0.400 +/- 0.320 0.008 +/- 0.025 -0.008 +/- 0.031 -0.360 +/- 0.260 0.012 +/- 0.028 11/09/04 -0.015 +/- 0.031 0.040 +/- 0.170 0.010 +/- 0.023 0.015 +/- 0.025 -0.200 +/- 0.210 0.006 +/- 0.020 Cs-137 Fe-59 I-131 K-40 Mn-54 Nb-95 05/04/04 0.003 +/- 0.032 -0.017* 0.067 -0.005 +/-0.051 16.300 t 1.300 0.011
  • 0.035 0.003 +/- 0.031 11/09/04 0.002 +/- 0.020 0.033 +/- 0.060 -0.008 +/- 0.056 14.800 +/- 1.000 0.000 +/- 0.022 0.007 +/- 0.026 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 05/04/04 0.003 +/- 0.028 -0.290 +/- 0.260 0.030
  • 0.069 0.690 +/- 0.130 -0.066 +/- 0.073 -0.050 +/- 0.100 11/09/04 -0.003 +/- 0.025 -0.060 +/- 0.190 0.003
  • 0.053 0.263 +/- 0.092 0.040 +/- 0.110 0.002 +/- 0.052 39-X Ag-llOm Be-7 Co-58 Co-60 Cr-51 Cs-134 02/24/04 -0.005 +/- 0.033 0.150 +/- 0.200 -0.019
  • 0.023 -0.001 +/- 0.028 0.150 +/- 0.230 -0.003
  • 0.023 05/25/04 -0.001 +/- 0.037 0.050 +/- 0.260 -0.002
  • 0.031 -0.002 +/- 0.033 -0.030
  • 0.260 -0.020 +/- 0.023 07/20/04 0.006
  • 0.033 0.080
  • 0.200 -0.011 +/- 0.024 0.094
  • 0.028 0.110 + 0.250 0.002 +/- 0.023 12/09/04 0.036 +/- 0.051 0.310 +/- 0.380 -0.022
  • 0.039 0.083
  • 0.037 -0.210
  • 0.550 -0.016 +/- 0.027 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 02/24/04 0.028 +/- 0.029 -0.051 +/- 0.056 0.012 +/- 0.045 13.700 +/- 0.980 0.010 +/- 0.023 -0.011 +/- 0.030 05/25/04 0.026 +/- 0.032 0.006
  • 0.075 0.012 +/- 0.080 10.400 +/- 1.200 0.020
  • 0.034 -0.026 +/- 0.046 07/20/04 0.106 +/- 0.036 -0.014 +/- 0.062 0.002 +/- 0.068 16.440 +/- 0.990 -0.001 +/- 0.026 -0.035
  • 0.034 12/09/04 0.096 +/- 0.053 -0.030 +/- 0.110 -0.580 +/- 0.510 17.000
  • 1.400 -0.035 +/- 0.037 -0.015 +/- 0.059 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/24/04 -0.006 +/- 0.024 0.140
  • 0.240 -0.020
  • 0.063 0.980
  • 0.110 0.130 +/- 0.110 -0.035
  • 0.093 05/25/04 -0.009 +/- 0.028 0.050
  • 0.220 -0.004 +/- 0.071 0.810
  • 0.150 -0.027 +/- 0.068 -0.060 +/- 0.110 07/20/04 0.006 +/- 0.026 -0.010 + 0.210 -0.015
  • 0.062 0.694
  • 0.089 0.030
  • 0.120 -5.100
  • 5.100 12/09/04 0.005 +/- 0.048 0.020 + 0.300 -0.025 +/- 0.084 0.580
  • 0.150 -0.050
  • 0.160 -0.120
  • 0.140 67-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 05/05/04 0.008 +/- 0.047 0.160 +/- 0.320 0.024
  • 0.037 -0.034 +/- 0.041 0.150
  • 0.340 0.007
  • 0.051 10/27/04 0.025 +/- 0.049 0.220
  • 0.300 0.032 +/- 0.032 -0.035
  • 0.040 0.070 +/- 0.360 -0.016
  • 0.045

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 15, Bottom Sediment (pCi/g dry) Page 4 of 4 Location Collection Isotope Date 67-X Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 05/05/04 0.195 +/- 0.065 0.000 +/- 0.085 0.036 +/- 0.065 16.900k 1.700 0.042 +/- 0.039 0.004 A 0.043 10/27/04 0.098 +/- 0.042 -0.095 +/- 0.081 0.029 i 0.080 12.500 + 1.500 0.020 +/- 0.033 -0.016 +/- 0.039 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 05/05/04 0.013 i 0.034 -0.290 + 0.390 0.052 +/- 0.091 1.120 +/- 0.180 -0.125 +/- 0.088 -0.110 +/- 0.170 10/27/04 0.008 +/- 0.036 -0.030 + 0.320 -0.067 +/- 0.084 0.600 +/- 0.170 0.007 i 0.097 -0.090 +/- 0.100

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 16, Aquatic Flora - Fucus (pCi/g wet) Page I of 2 Location Collection Isotope Date 29 Ag-llOm Be-7 Co-58 Co-60 Cr-51 Cs-134 02/24/04 0.002 i 0.009 -0.086 +/- 0.080 0.007 + 0.007 0.002 +/- 0.007 -0.017 +/- 0.055 -0.004 +/- 0.007 05/25/04 0.002 i 0.011 0.117 +/- 0.093 -0.002 +/- 0.007 0.002 +/- 0.007 -0.067 +/- 0.069 0.005 +/- 0.009 08/24/04 0.011 +/-0.016 -0.083 + 0.087 0.000 +/- 0.012 0.006 +/- 0.017 0.030 + 0.078 -0.005 +/- 0.012 11/10/04 -0.011 i 0.024 0.060 +/-0.150 0.008 +/- 0.017 0.001 +/- 0.018 -0.070 +/- 0.170 -0.001 +/- 0.018 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 02124/04 0.005 +/-0.006 -0.009 +/- 0.026 -0.014 +/- 0.014 4.830 +/- 0.350 0.004 +/- 0.007 -0.002 +/- 0.007 05/25/04 0.000 +/- 0.007 0.010 +/- 0.024 -0.001 +/- 0.017 l 5.110 0.400 -0.003 +/- 0.007 0.005 +/- 0.011 08/24/04 0.012 + 0.010 0.004 + 0.049 -0.022 4 0.038 8.060+/- 0.660 0.004 +/- 0.011 -0.021 +/- 0.016 11/10/04 -0.002 +/- 0.019 -0.019 +/- 0.078 -0.022 + 0.059 8.090 +/- 0.970 -0.001 i 0.015 -0.003 +/- 0.022 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/24/04 -0.003 +/- 0.006 -0.020 +/- 0.055 0.002 +/- 0.013 0.044 i 0.034 0.012 +/- 0.017 -0.003 +/- 0.012 05/25/04 -0.004 + 0.007 0.033 +/- 0.060 -0.002 +/- 0.015 0.030 +/- 0.032 0.007 +/- 0.021 -0.005 +/- 0.013 08/24/04 0.001 +/- 0.011 0.007 +/- 0.086 0.010 + 0.020 0.051 +/- 0.045 -0.011 +/- 0.029 0.000 +/- 0.023 11/10/04 -0.007 +/- 0.017 0.030 + 0.140 -0.035 + 0.028 -0.013 +/- 0.070 -0.020 +/- 0.048 -0.022 +/- 0.034 32-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 02/24/04 0.001 +/- 0.010 0.026+/- 0.051 0.004 +/- 0.007 0.000 + 0.007 -0.005 +/- 0.059 0.006 +/- 0.007 05/25/04 -0.003 +/- 0.011 0.027 +/- 0.070 -0.005 : 0.008 0.003 + 0.009 -0.040 + 0.069 0.006 +/- 0.008 08/24/04 -0.008 +/- 0.017 0.010 +/- 0.110 -0.002 + 0.011 0.003 +/- 0.020 0.010 i 0.110 0.010 +/- 0.013 11/10/04 0.009 +/- 0.028 0.100 +/- 0.130 0.001 +/- 0.017 -0.005 +/- 0.020 0.040 +/- 0.160 -0.007 +/- 0.016 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 02/24/04 -0.003 +/- 0.006 0.004 +/- 0.023 0.016 +/- 0.016 5.510 +/- 0.350 0.003 i 0.007 -0.002 +/- 0.007 05/25/04 0.006 +/-0.008 -0.007 +/- 0.025 -0.005 +/- 0.019 5.830 +/- 0.400 -0.004 +/- 0.007 -0.002 +/- 0.007 08/24/04 -0.006 +/- 0.013 0.020 +/- 0.041 0.016 +/- 0.049 8.780 i 0.700 0.007 +/- 0.012 0.011 +/- 0.015 11/10/04 -0.001 : 0.018 0.001 +/- 0.082 -0.005 +/- 0.066 9.010 +/- 0.920 -0.001 +/- 0.014 -0.022 +/- 0.018 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/24/04 -0.001 +/- 0.007 -0.026 : 0.058 0.009 +/- 0.014 0.034 + 0.032 0.007 +/- 0.016 -0.003 +/- 0.012 05/25/04 0.007 +/- 0.007 0.008 +/- 0.062 0.006 +/- 0.018 0.032 +/- 0.029 -0.016 +/- 0.021 0.001 +/- 0.012 08/24/04 -0.008 +/- 0.014 0.020 +/- 0.100 0.005 + 0.026 0.070 +/- 0.054 0.012 + 0.034 0.009 +/- 0.020 11/10/04 0.010 +/- 0.014 -0.060 +/- 0.120 0.020 +/- 0.037 0.063 + 0.073 0.001 +/- 0.089 0.008 +/- 0.030 33-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 05/05/04 0.000 +/- 0.006 0.138 +/- 0.054 -0.001 +/-0.005 -0.001 + 0.005 -0.007 i 0.038 0.000 +/- 0.005 05/25/04 0.003 +/- 0.012 0.057 +/- 0.086 -0.002 +/- 0.009 0.007 + 0.011 -0.014 +/- 0.066 -0.004 +/- 0.010 10/27/04 0.007 +/- 0.015 0.083 + 0.074 0.003 +/- 0.010 0.009 i0.010 0.014 i 0.084 0.001 + 0.010 Cs-137 Fe-59 I-131 K-40 Mn-54 Nb-95 05/05/04 0.002 +/- 0.004 0.003 +/- 0.014 0.008 +/- 0.007 5.360 i 0.220 0.000 +/- 0.005 -0.002 +/- 0.005 05/25/04 0.003 +/- 0.009 0.019 +/- 0.029 0.019 +/- 0.020 5.210 i 0.530 0.004 +/- 0.010 0.003 +/- 0.010 10/27/04 -0.003 +/- 0.010 0.003 +/- 0.036 0.008 + 0.020 7.240 +/- 0.570 0.009 +/- 0.010 -0.008 +/- 0.010

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 16, Aquatic Flora - Fucus (pCi/g wet) Page 2 of 2 Location Collection Isotope Date 33-X Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 05/05/04 0.001 +/- 0.005 -0.010 t 0.044 0.001 +/- 0.011 0.034 +/- 0.024 -0.011 +/- 0.013 0.002 + 0.009 05/25/04 0.000 +/- 0.007 -0.027 +/- 0.078 -0.002 +/- 0.019 0.041 +/- 0.039 -0.018 +/- 0.027 -0.019 +/- 0.021 10/27/04 -0.005 +/- 0.009 -0.053 +/- 0.084 -0.009 +/- 0.023 0.045 +/- 0.049 0.002 +/- 0.027 0.022 +/- 0.016 35-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 02/24/04 0.004 +/- 0.008 0.007 +/- 0.046 0.001 +/- 0.006 0.003 +/- 0.007 -0.003 +/- 0.035 -0.003 +/- 0.006 05/25/04 -0.014 +/- 0.014 0.109 + 0.089 0.008 :+/- 0.011 -0.007 +/- 0.010 0.032 +/- 0.080 0.005 + 0.010 08/24/04 0.009 +/- 0.013 0.057 +/- 0.095 0.004 +/- 0.012 0.002 +/- 0.018 -0.030 +/- 0.100 0.001 +/- 0.010 11/10/04 0.002 +/- 0.017 0.060 +/- 0.099 -0.003 +/- 0.013 -0.003 +/- 0.014 0.040 +/- 0.130 0.011 +/- 0.013 Cs-137 Fe-59 I-131 K-40 Mn-54 Nb-95 02/24/04 -0.003 +/- 0.005 0.009 +/- 0.021 0.014 +/- 0.012 4.870 +/- 0.320 0.006 +/- 0.005 0.000 +/- 0.007 05/25/04 0.000 +/- 0.009 0.023 +/- 0.033 0.014 +/- 0.022 5.930 +/- 0.570 -0.001 +/- 0.010 0.005 +/- 0.013 08/24/04 0.007 +/- 0.012 -0.029 +/- 0.045 0.006 +/- 0.043 6.610 +/- 0.630 0.011 +/- 0.011 -0.013 +/- 0.015 11/10/04 0.004 +/- 0.013 0.026 i 0.051 0.007 +/- 0.043 7.530 +/- 0.730 0.001 i 0.011 -0.005 +/- 0.018 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/24/04 -0.002 + 0.005 -0.008 +/- 0.040 -0.006 + 0.011 0.028 +/- 0.024 -0.009 +/- 0.013 0.004 + 0.010 05/25/04 -0.005 : 0.009 0.011 +/- 0.088 -0.007 +/- 0.021 0.037 +/- 0.051 -0.007 + 0.030 0.005 i 0.018 08/24/04 0.001 +/- 0.011 -0.030 +/- 0.110 0.005 +/- 0.023 0.079 + 0.062 0.023 +/- 0.029 0.026 +/- 0.022 11/10/04 -0.001 +/- 0.012 -0.040 + 0.110 -0.013 +/- 0.028 0.085 +/- 0.058 0.021 +/- 0.038 0.009 +/- 0.026 36-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 05/05/04 0.004 +/- 0.010 0.240 +/- 0.091 0.005 +/- 0.007 -0.001 +/- 0.009 0.038 +/- 0.072 0.010 +/- 0.009 05/25/04 0.008 +/- 0.007 0.069 i 0.057 0.003 +/- 0.005 0.004 +/- 0.005 -0.043 +/- 0.048 0.003 i 0.006 11/09/04 -0.006+/- 0.024 0.160 +/- 0.160 0.006 +/- 0.016 -0.029 +/- 0.029 0.060 t0.190 -0.009 i 0.022 Cs-137 Fe-59 I-131 K-40 Mn-54 Nb-95 05/05/04 -0.007 +/- 0.008 0.006 +/- 0.029 0.021 +/- 0.007 6.320 +/- 0.450 0.003 +/- 0.008 -0.001 : 0.009 05/25/04 -0.001 +/- 0.005 0.003 +/- 0.018 0.012 +/- 0.013 5.070 +/- 0.270 0.005 + 0.005 0.004 +/- 0.006 11/09/04 -0.006+/- 0.016 0.009 +/- 0.080 -0.019 + 0.076 8.600 +/- 1.000 0.002 +/- 0.014 0.026 +/- 0.030 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 05/05/04 0.004 +/- 0.006 -0.046 + 0.075 -0.006 +/- 0.020 0.061 +/- 0.045 -0.004 +/- 0.021 -0.003 +/- 0.013 05/25/04 0.000 +/- 0.005 0.019 +/- 0.044 0.000 +/- 0.012 0.044 +/- 0.028 0.006 +/- 0.014 0.010 +/- 0.008 11/09/04 -0.002 +/- 0.017 0.010 +/- 0.140 -0.030 i 0.036 0.014 +/- 0.067 -0.026 +/- 0.060 -0.004 + 0.038

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 17-A, Fish - Flounder (pCi/g wet) Page I of I Location Collection Isotope Date 32 Ag-llOm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/31/04 I 06/15/04 -0.004 +/- 0.013 -0.026 +/- 0.077 -0.003 +/- 0.009 0.003 +/- 0.010 0.070 +/- 0.100 0.000 + 0.009 08/09/04 -0.014 +/- 0.037 0.150 : 0.250 -0.006 +/- 0.026 0.000 +/- 0.033 0.060 +/- 0.320 -0.006 +/- 0.025 10/19/04 -0.015 +/- 0.049 -0.090 +/- 0.300 0.003 +/- 0.037 -0.007 +/- 0.041 -0.210 +/- 0.340 0.034 +/- 0.034 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/31/04 06115/04 0.002 +/- 0.009 0.004 +/- 0.027 0.021 :+/- 0.043 2.930 +/- 0.280 -0.002 +/- 0.008 0.009 +/- 0.012 08/09/04 0.011 +/- 0.029 -0.040 +/- 0.110 0.006 +/- 0.081 3.560 +/- 0.870 -0.012 +/- 0.029 -0.021 +/- 0.037 10/19/04 0.007 +/- 0.038 -0.040 +/- 0.110 0.010 +/- 0.110 2.890 +/- 0.830 -0.003 +/- 0.036 0.065 +/- 0.045 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/31/04 06/15/04 -0.001 i 0.011 -0.018 +/- 0.078 0.025 +/- 0.020 0.013 +/- 0.038 0.013 +/- 0.020 0.008 +/- 0.017 08/09/04 0.031 +/- 0.028 -0.100 i 0.250 -0.018 +/- 0.074 -0.030 +/- 0.091 0.070

  • 0.150 0.012 +/- 0.045 10/19/04 -0.037 +/- 0.031 -0.020 +/- 0.310 0.014 +/- 0.091 0.060 +/- 0.130 -0.031 +/- 0.091 0.064 +/- 0.066 35 Ag- lOnm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/31/04 1 04/21/04 0.024 +/- 0.028 -0.110 i 0.210 0.000
  • 0.035 -0.008 +/- 0.028 0.230 +/- 0.240 0.010 +/- 0.030 08/09/04 -0.020 +/- 0.042 0.180 +/- 0.270 -0.007 +/- 0.024 -0.010 +/- 0.041 0.080 +/- 0.270 -0.002 +/- 0.018 11/15/04 0.000 +/- 0.010 0.045 +/- 0.072 0.000 +/- 0.008 -0.007 + 0.008 -0.002 +/- 0.096 0.001
  • 0.008 Cs-137 Fe-59 I-131 K-40 Mn-54 Nb-95 03/31/04 04/21/04 0.000i 0.018 0.031 +/- 0.089 -0.027+/- 0.084 3.570+/- 0.980 -0.009* 0.033 -0.017*0.042 08/09/04 0.002 +/- 0.030 0.081 +/- 0.079 0.020 : 0.090 4.090 +/- 0.930 0.000 +/- 0.023 -0.007 +/- 0.031 11/15/04 -0.002 +/- 0.007 0.017 +/- 0.027 0.043 +/- 0.049 3.700 +/- 0.240 -0.001 +/- 0.007 0.007 +/- 0.012 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/31/04 04/21/04 -0.002 +/- 0.030 -0.210 +/- 0.160 0.007 +/- 0.059 -0.040 +/- 0.100 -0.010 + 0.054 -0.005 +/- 0.047 08/09/04 0.015
  • 0.031 0.040 +/- 0.260 0.019 : 0.063 0.020
  • 0.130 0.000 t 0.065 -0.002
  • 0.039 11/15/04 -0.016
  • 0.010 -0.008
  • 0.072 0.004 +/- 0.018 -0.003
  • 0.035 -0.010 +/- 0.019 -0.003 +/- 0.019

Dominion Nudear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 17-B, Fish - Other (pCi/g wet) Page I of 2 Location Collection Sample Type Isotope Date 32 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 01/12/04 SKATE -0.006 + 0.025 0.070 + 0.190 -0.003 : 0.023 0.008 +/- 0.020 -0.040 : 0.230 06/11/04 BLUEFISH 0.001 +/- 0.012 0.016 +/- 0.076 -0.003 +/- 0.010 0.004 +/- 0.011 -0.060 +/- 0.100 08/04/04 TAUTOG 0.002 +/- 0.021 -0.010 + 0.120 0.015 + 0.017 -0.004 + 0.022 0.080 + 0.130 10/27/04 STRIPED BASS -0.005 +/- 0.042 0.190 + 0.240 -0.023 +/- 0.026 0.008 + 0.028 -0.100 + 0.270 Cs-134 Cs-137 Fe-59 1-131 K-40 01/12104 SKATE 0.002 + 0.019 -0.004 +/- 0.019 -0.079 + 0.073 -0.040 +/- 0.180 1.900 +/- 0.570 06/11/04 BLUEFISH -0.009 t0.009 0.011 +/- 0.009 -0.015 +/- 0.035 0.017k 0.056 3.560+ 0.310 08/04/04 TAUTOG -0.003 +/- 0.018 0.012 + 0.016 -0.022 +/- 0.065 -0.003 +/- 0.041 3.750 +/- 0.600 10/27/04 STRIPED BASS 0.000 +/- 0.025 0.008 + 0.032 0.008 +/- 0.072 0.059 +/- 0.065 4.220 +/- 0.970 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 01/12/04 SKATE 0.022 +/- 0.023 0.008 +/- 0.037 -0.010 +/- 0.027 0.020 i 0.170 0.040 +/- 0.055 06/11/04 BLUEFISH -0.003 + 0.008 0.005 +/- 0.012 0.004 + 0.010 0.012+ 0.081 -0.019+/- 0.020 08/04/04 TAUTOG -0.002 +/- 0.016 -0.012 + 0.021 -0.004 +/- 0.018 -0.040 +/- 0.140 -0.032 +/- 0.040 10/27/04 STRIPED BASS 0.007 +/- 0.019 0.001 +/- 0.032 -0.006 +/- 0.033 -0.210 +/- 0.240 0.007 +/- 0.077 Th-228 Zn-65 Zr-95 01/12/04 SKATE -0.007 + 0.068 -0.052 + 0.051 -0.025 +/- 0.051 06/11/04 BLUEFISH -0.014 +/- 0.037 0.003 +/- 0.019 0.001 +/- 0.016 08/04/04 TAUTOG 0.051 + 0.061 -0.004 +/- 0.041 0.004 +/- 0.035 10/27/04 STRIPED BASS 0.000 +/- 0.110 -0.050 +/- 0.082 0.019 +/- 0.052 35 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 01/12/04 SKATE 0.003 +/- 0.029 -0.020 +/- 0.160 -0.002 + 0.023 0.009 +/- 0.018 0.000 +/- 0.270 05/18/04 SKATE 0.002 +/- 0.018 -0.010 +/- 0.110 0.014 + 0.014 0.001 +/- 0.023 -0.020 +/- 0.120 08/23/04 TAUTOG 0.004 +/- 0.032 0.040 +/- 0.200 -0.005 + 0.025 -0.008 +/- 0.028 -0.040 +/- 0.240 11/15/04 SKATE -0.010 t 0.010 -0.012 +/- 0.070 0.006 +/- 0.007 0.002 +/- 0.007 0.057 +/- 0.096 Cs-134 Cs-137 Fe-59 1-131 K-40 01/12/04 SKATE -0.003 +/- 0.025 -0.006 +/- 0.021 -0.008 +/- 0.082 -0.120 +/- 0.260 J 1.480 +/- 0.520 05/18/04 SKATE -0.018 +/- 0.018 -0.006 +/- 0.013 0.023 +/- 0.040 0.006 +/- 0.024 2.530 +/- 0.470 08/23/04 TAUTOG 0.001 +/- 0.026 -0.004 +/- 0.022 -0.013 I 0.059 -0.069 +/- 0.080 4.100 +/- 0.590 11/15/04 SKATE 0.001 +/- 0.007 0.003 +/- 0.007 0.005 +/- 0.025 0.012 + 0.052 2.590 +/- 0.200 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 01/12/04 SKATE 0.005 +/- 0.018 0.002 + 0.035 0.000 +/- 0.029 -0.090 +/- 0.190 0.000 +/-0.055 05/18/04 SKATE 0.011 + 0.016 0.001 0.018 0.005 +/- 0.014 0.060 +/- 0.120 -0.008 + 0.034 08/23/04 TAUTOG -0.001 +/- 0.025 0.038 + 0.045 -0.013 +/- 0.030 -0.150 +/- 0.220 -0.024 +/- 0.056 11/15/04 SKATE 0.000 +/- 0.007 -0.001 +/- 0.010 0.006 +/- 0.009 -0.006 +/- 0.066 0.005 +/- 0.020 Th-228 Zn-65 Zr-95 01/12/04 SKATE -0.014 +/- 0.074 -0.043 +/- 0.050 -0.027 +/- 0.041 05/18/04 SKATE 0.027 +/- 0.053 -0.021 + 0.038 -0.003 +/- 0.029 08/23/04 TAUTOG -0.021 +/- 0.088 -0.010 +/- 0.100 0.043 +/- 0.042 11/15/04 SKATE 0.012 +/- 0.032 0.038 +/- 0.029 0.006 +/- 0.014 40-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 02/04/04 STRIPED BASS 0.026 +/- 0.042 -0.110 +/- 0.340 -0.037 +/- 0.034 0.005 +/- 0.029 0.080 +/- 0.400 05/19/04 STRIPED BASS 0.003 +/- 0.022 -0.030 +/- 0.120 -0.009 +/- 0.016 -0.002 +/- 0.017 -0.010 +/- 0.120 08/02/04 STRIPED BASS -0.022 4 0.029 0.020 +/- 0.150 -0.008 +/- 0.014 0.000 + 0.027 -0.160 +/- 0.170 11/18/04 STRIPED BASS 0.010 +/- 0.013 0.118 +/- 0.085 -0.009 +/- 0.009 0.005 +/- 0.013 0.000 +/- 0.100

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 17-B, Fish - Other (pCi/g wet) Page 2 of 2 Location Collection Sample Type Isotope Date 40-X Cs-134 Cs-137 Fe-59 1-131 K-40 02/04/04 STRIPED BASS 0.003 +/- 0.029 0.018 4 0.029 0.020 +/- 0.100 -0.290 + 0.300 J 2.9001+1.000 05/19/04 STRIPED BASS 0.003 +/- 0.018 0.020 +/- 0.017 -0.018 +/- 0.054 -0.007 +/- 0.029 3.820 +/- 0.540 08/02/04 STRIPED BASS -0.003 : 0.021 0.001 + 0.019 0.037 +/- 0.057 0.000i 0.050 3.330 +/- 0.620 11/18/04 STRIPED BASS -0.003 +/- 0.009 0.001 i 0.010 0.027 +/- 0.037 -0.054 +/- 0.048 4.030 +/- 0.340 Mn-54 Nb-95 Ru-103 Ru-106 Sb-125 02/04/04 STRIPED BASS -0.018 +/- 0.036 -0.003 +/- 0.039 -0.005 +/- 0.043 0.110 + 0.280 0.017 +/- 0.073 05/19/04 STRIPED BASS -0.005 +/- 0.014 -0.008 +/- 0.016 -0.003 +/- 0.014 0.020 +/- 0.140 0.006 +/- 0.035 08/02/04 STRIPED BASS 0.007+/- 0.018 0.010:10.026 0.000+/- 0.018 -0.160t 0.190 0.024 + 0.043 11/18/04 STRIPED BASS -0.009 +/- 0.009 -0.009 +/- 0.012 0.016 +/- 0.011 0.016k 0.088 0.009 + 0.023 Th-228 Zn-65 Zr-95 02/04/04 STRIPED BASS 0.100+/-:0.150 0.000:+ 0.072 0.014 +/- 0.055 05/19/04 STRIPED BASS 0.009+/- 0.069 0.020 + 0.039 0.004 + 0.025 08/02/04 STRIPED BASS 0.029+/- 0.075 -0.034 +/- 0.049 0.005 +/- 0.029 11/18/04 STRIPED BASS 0.034 +/- 0.036 0.000+/- 0.022 -0.017 +/- 0.017

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 18, Mussels (pCi/g wet) Page I of I Location Collection Isotope Date 28 Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/26/04 -0.018 +/- 0.016 0.170 +/- 0.120 -0.007 +/- 0.012 -0.001 +/- 0.014 -0.040 +/- 0.170 0.008 +/- 0.013 06/09/04 0.002 + 0.019 0.170 +/- 0.160 0.003 +/- 0.017 0.016 +/- 0.019 -0.100 +/- 0.160 -0.016 +/- 0.020 07/22/04 0.013 +/- 0.022 0.050 +/- 0.130 0.002 +/- 0.014 0.015 +/- 0.021 -0.120 + 0.140 -0.004 +/- 0.014 12/09/04 -0.008 +/- 0.017 0.040 +/- 0.120 -0.009 +/- 0.014 0.012 +/- 0.012 0.100 +/- 0.140 -0.004 +/- 0.014 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/26/04 -0.004 +/- 0.010 0.002 +/- 0.043 -0.020 +/- 0.100 1.850 +/- 0.310 0.001 +/- 0.011 0.007 +/- 0.019 06/09/04 0.001 +/- 0.014 -0.002 +/- 0.040 0.011 +/- 0.030 1.960 +/- 0.490 0.003 +/- 0.016 0.002 +/- 0.021 07/22/04 0.001 +/- 0.016 0.002 +/- 0.041 -0.010 +/- 0.038 1.740 +/- 0.440 0.000 +/- 0.015 -0.004 +/- 0.018 12/09/04 0.003 +/- 0.010 -0.023 +/- 0.044 0.044 +/- 0.074 1.390 +/- 0.320 -0.007 +/- 0.012 0.006 +/- 0.016 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/26/04 -0.004 +/-0.018 -0.010+/-0 .110 0.011 +/- 0.029 0.022 +/-0.062 -0.011 +/- 0.026 -0.012+/- 0.025 06/09/04 0.004 +/- 0.016 -0.110 +/- 0.170 0.040 +/- 0.048 0.045 +/- 0.067 -0.063 +/- 0.050 0.018 +/- 0.031 07/22/04 0.024 +/- 0.017 0.060 +/- 0.160 0.011 +/- 0.034 0.032 +/- 0.066 -0.026 +/- 0.034 0.005 +/- 0.028 12/09/04 -0.010 +/- 0.017 -0.010 +/- 0.100 -0.017 +/- 0.030 0.048 +/- 0.054 -0.021 +/- 0.026 -0.019 +/- 0.025 30 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/12/04 -0.001 +/- 0.007 0.092 +/- 0.072 0.003 +/- 0.006 0.001 +/- 0.005 0.045 +/- 0.088 0.005 +/- 0.005 06/09/04 -0.012 +/- 0.025 0.190 +/- 0.170 -0.009 +/- 0.017 -0.011 +/- 0.019 0.070 +/- 0.160 -0.001 +/- 0.017 08/10/04 0.010 +/- 0.032 0.110 +/- 0.230 -0.026 t 0.029 0.014 +/- 0.029 0.030 t 0.260 -0.020 +/- 0.025 12/15/04 0.010 +/- 0.019 0.150 +/- 0.130 -0.003 +/- 0.013 -0.001 +/- 0.015 0.080 +/- 0.130 0.010+/- 0.014 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/12/04 -0.003 +/- 0.004 0.001 +/- 0.020 0.110+/- 0.120 1.860+/- 0.120 0.001 +/- 0.005 0.006+/- 0.009 06/09/04 0.002 +/- 0.017 0.006+/- 0.042 -0.003 +/- 0.035 2.030 +/- 0.500 0.000 +/- 0.017 -0.016 +/- 0.019 08/10/04 -0.020 +/- 0.022 0.006 +/- 0.060 0.036 +/- 0.067 1.770 +/- 0.580 0.002 +/- 0.021 -0.022 +/- 0.034 12/15/04 -0.005 +/- 0.013 -0.025 +/- 0.040 -0.005 +/- 0.057 1.510 +/- 0.320 0.006+/- 0.013 0.025 +/- 0.017 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/12/04 -0.009 +/- 0.009 -0.011 +/- 0.046 0.005 +/- 0.010 -0.009 +/- 0.022 -0.004 +/- 0.011 0.000 +/- 0.011 06/09/04 -0.011 +/- 0.017 0.110 +/- 0.180 -0.033 +/- 0.047 -0.004 +/- 0.055 0.033 +/- 0.092 0.003 +/- 0.034 08/10/04 -0.006 +/- 0.026 -0.080 +/- 0.220 -0.027 +/- 0.053 -0.030 +/- 0.100 0.130 +/- 0.110 0.017 +/- 0.046 12/15/04 -0.002 +/- 0.014 -0.010 +/- 0.110 -0.012+/- 0.031 -0.002+/- 0.051 -0.013 +/- 0.033 0.003 +/- 0.021

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 19, Oysters (pCi/g wet) Page l of 3 Location Collection Isotope Date 31 Ag-1Orm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/24/04 -0.001 +/- 0.017 0.080 +/- 0.120 -0.002 +/- 0.012 -0.010 +/- 0.013 0.050 +/- 0.170 0.006 +/- 0.013 06/28/04 -0.003 +/- 0.023 0.130O 0.190 0.001b 0.019 0.001 : 0.018 0.090+ 0.180 -0.007 0.016 09/22/04 0.016 +/- 0.020 0.010+/- 0.120 -0.007+/- 0.014 -0.019+/- 0.022 0.030+/- 0.130 -0.021 0.015 12/14/04 -0.009 +/- 0.011 0.078 +/- 0.074 0.003 +/- 0.010 0.004 +/- 0.009 0.029 +/- 0.092 0.005 + 0.009 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/24/04 -0.002 +/- 0.012 -0.013 +/- 0.047 -0.010 +/- 0.110 1.400 +/- 0.290 -0.007 +/- 0.011 -0.004 +/- 0.017 06/28/04 0.000+/- 0.023 0.001 +/- 0.073 -0.013 +/- 0.053 1.440+/- 0.510 -0.001 +/- 0.021 -0.009:L 0.022 09/22/04 0.003 +/- 0.015 -0.027 +/- 0.051 -0.004 +/- 0.023 1.480 +/- 0.370 0.000 +/- 0.014 -0.005 +/- 0.014 12/14/04 0.001 +/- 0.008 0.003 + 0.027 0.019 + 0.039 1.290 + 0.190 -0.004 +/-0.009 0.012 +/- 0.012 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/24/04 0.002 +/- 0.016 -0.020 +/- 0.110 -0.014 + 0.026 -0.022 + 0.049 -0.023 +/- 0.029 0.010 +/- 0.022 06/28/04 -0.004 +/- 0.019 -0.110 +/- 0.190 0.000 + 0.051 0.071 t 0.072 -0.017 : 0.046 0.012 +/- 0.032 09/22/04 0.004 +/- 0.016 0.010 +/- 0.120 -0.027 + 0.037 -0.008 d 0.056 -0.006 +/- 0.032 -0.013 +/- 0.021 12/14/04 0.001 +/- 0.010 -0.035 +/- 0.078 -0.005 + 0.020 0.001 : 0.033 -0.017 +/- 0.020 -0.002 +/- 0.016 32 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/18/04 0.042 +/- 0.005 -0.004 +/- 0.058 0.004 +/- 0.007 -0.001 + 0.005 0.049 +/- 0.089 0.005 + 0.005 06/23/04 0.089 +/- 0.010 0.036 + 0.077 0.000 +/- 0.008 0.007 +/- 0.008 -0.022 +/- 0.098 0.001 +/- 0.008 09/17/04 0.015 +/- 0.064 -0.100 +/- 0.460 -0.044 +/- 0.047 0.042 +/- 0.046 -0.290 +/- 0.420 -0.001 +/- 0.043 12/14/04 0.014 t 0.012 0.019 +/- 0.077 -0.001 +/- 0.009 0.005 i 0.009 0.017 +/- 0.098 0.004 +/- 0.011 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/18/04 0.011 +/- 0.012 -0.007 + 0.019 -0.029 +/- 0.096 2.130 4 0.140 -0.001 : 0.005 0.005 + 0.014 06/23/04 -0.018 +/- 0.023 -0.009 + 0.024 0.000 +/- 0.038 1.590 +/- 0.190 0.000 +/- 0.008 0.014 +/- 0.015 09/17/04 0.028 +/- 0.043 -0.073 4 0.097 0.030 + 0.110 2.940 +/- 0.980 -0.017 +/- 0.042 0.023 +/- 0.056 12/14/04 -0.007 +/- 0.009 -0.008 +/- 0.027 -0.020 + 0.041 1.370 +/- 0.210 -0.003 +/- 0.008 0.012 +/- 0.015 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/18/04 0.006 +/- 0.009 0.018 +/- 0.048 0.002 +/- 0.012 0.008 +/- 0.023 -0.004 +/- 0.012 0.001 +/- 0.012 06/23/04 0.002 +/- 0.009 0.035 +/- 0.074 -0.001 +/- 0.021 -0.006 : 0.030 -0.025 4 0.018 0.015 + 0.015 09/17/04 0.040 +/- 0.058 -0.220 +/- 0.500 0.030 +/- 0.120 0.090 +/- 0.160 -0.120 +/- 0.110 0.006 +/- 0.096 12/14/04 -0.002 + 0.011 0.033 +/- 0.080 0.001 - 0.021 -0.012 +/- 0.045 -0.016 +/- 0.021 0.008 +/- 0.017 34-X Ag-1Orm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/24/04 -0.005 +/- 0.007 -0.018 +/- 0.060 0.000 +/- 0.006 -0.001 1 0.006 -0.030 +/- 0.084 0.003 + 0.006 06/28/04 0.005 +/- 0.017 -0.010 i 0.130 -0.003 +/- 0.015 -0.006+/- 0.014 0.040 +/- 0.150 -0.003 +/- 0.015 09/21/04 -0.009 +/- 0.021 0.090 +/- 0.150 0.019 +/- 0.016 -0.002 +/- 0.023 0.070 +/- 0.140 -0.002 +/- 0.021 12/14/04 -0.020 +/- 0.023 0.120 +/- 0.180 -0.029 +/- 0.023 -0.005 +/- 0.017 -0.100 +/- 0.220 -0.009 +/- 0.019 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/24/04 0.001 +/- 0.006 0.000 +/- 0.021 0.044 +/- 0.065 1.540 +/- 0.140 0.000 +/-0.005 -0.003 +/- 0.009 06/28/04 -0.004 +/- 0.014 -0.005 +/- 0.040 0.000 +/- 0.047 1.850 + 0.400 -0.002 +/- 0.015 -0.004 +/- 0.017 09/21/04 0.005 +/- 0.017 0.036 +/- 0.060 -0.009 + 0.025 1.880 + 0.540 -0.001 +/- 0.022 -0.015 +/- 0.018 12/14/04 0.000 +/- 0.018 -0.008 +/- 0.053 -0.045 +/- 0.092 1.430 +/- 0.460 0.003 + 0.017 -0.013 4 0.026

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 19, Oysters (pCilg wet) Page 2 of 3 Location Collection Isotope Date 34-X Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/24/04 -0.001 +/- 0.007 -0.068 +/- 0.054 -0.001 +/- 0.014 0.001 +/- 0.024 -0.008 +/- 0.012 -0.009 + 0.012 06/28/04 -0.002 +/- 0.015 0.030 +/- 0.150 -0.016 +/- 0.038 -0.034 i 0.052 0.004 +/- 0.036 -0.005 0.029 09/21/04 0.003 +/- 0.016 -0.110 +/- 0.160 0.023 +/- 0.039 -0.029 +/- 0.078 -0.014 +/- 0.040 0.008 + 0.030 12/14/04 0.001 i 0.022 0.080 +/- 0.180 -0.018 +/- 0.047 0.005 +/- 0.060 -0.032 +/- 0.040 -0.041 + 0.040 36 Ag-ll0m Be-7 Co-58 Co-60 Cr-51 Cs-134 03/25/04 -0.004 L0.016 0.010 +/- 0.110 -0.002 + 0.015 0.008 4 0.016 -0.020 1 0.140 0.002 i 0.015 06/16/04 0.010 + 0.015 -0.110 +/- 0.100 -0.002 4 0.010 0.005 + 0.013 -0.050 + 0.120 0.000 1 0.012 09/21/04 0.015 +/- 0.015 0.010 +/- 0.100 0.001 +/- 0.012 0.003 + 0.010 -0.010 + 0.110 0.002 +/- 0.013 12/15/04 K Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/25/04 0.004 + 0.012 -0.030 +/- 0.058 0.008 + 0.087 1.540 + 0.370 0.006 + 0.015 0.008 + 0.022 06/16/04 -0.001 +/- 0.011 0.021 +/- 0.033 -0.008 + 0.045 1.840 : 0.300 0.008 + 0.011 -0.001 + 0.013 09/21/04 0.006 +/- 0.012 -0.035 + 0.036 -0.015 4 0.022 1.580 +/- 0.340 0.006 +/- 0.012 -0.002 t 0.014 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/25/04 -0.024 +/- 0.016 0.030 +/- 0.120 0.002 +/- 0.031 -0.014 +/- 0.044 -0.028 +/- 0.035 0.003 l 0.025 06/16/04 0.008 +/- 0.012 0.047 +/- 0.097 -0.002 +/- 0.023 0.005 +/- 0.046 0.006 +/- 0.022 -0.003 : 0.0 18 09/21/04 0.004 +/- 0.011 0.000 +/- 0.130 0.018 +/- 0.034 0.037 +/- 0.049 -0.021 4 0.033 -0.003 + 0.023 37-C Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/25/04 -0.007 : 0.018 0.010 +/- 0.110 0.001 +/- 0.013 -0.002 +/- 0.011 -0.230 +/- 0.190 -0.003 +/- 0.011 06/16/04 0.005 +/- 0.011 0.046 +/- 0.076 0.005 +/-0.010 0.012 +/- 0.011 0.024 +/- 0.083 0.000 +/- 0.010 09/21/04 0.005 +/-0.015 0.029 +/- 0.090 0.009 +/- 0.012 0.003 +/- 0.014 -0.030 +/- 0.100 0.003 i 0.012 12/15/04 0.000 +/- 0.021 -0.050 +/- 0.160 -0.004 +/- 0.016 -0.003 +/- 0.015 -0.050 +/- 0.220 0.005 +/- 0.018 Cs-137 Fe-59 1-131 K-40 Mln-54 Nb-95 03/25/04 0.004 +/- 0.013 -0.022 +/- 0.044 0.000 1 0.110 1.870 +/- 0.330 0.001 +/- 0.014 0.009 4 0.019 06/16/04 0.013 +/- 0.009 0.018 +/- 0.034 0.022 +/- 0.032 1.630 +/- 0.250 -0.002 +/- 0.010 0.003 +/- 0.013 09/21/04 -0.001 +/- 0.012 0.025 +/- 0.032 -0.010 + 0.020 1.630 +/- 0.330 -0.004 +/- 0.012 -0.004 + 0.015 12/15/04 -0.001 i0.016 0.036 0.046 0.016+/-0.078 1.790O0.440 -0.013+/-0.014 0.011 +/-0.027 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/25/04 0.000 +/- 0.016 -0.050 +/- 0.120 -0.008 +/- 0.030 0.051 +/- 0.049 0.019 +/- 0.037 0.002 + 0.025 06/16/04 0.001 +/- 0.010 -0.126 + 0.079 -0.008 +/- 0.020 0.023 +/- 0.031 0.008 + 0.021 -0.003 +/- 0.018 09/21/04 0.005 +/- 0.013 -0.110 +/- 0.120 -0.003 +/- 0.025 -0.027 +/- 0.038 -0.023 +/- 0.028 0.000 + 0.022 12/15/04 0.001 d 0.021 -0.050 + 0.140 -0.013 +/- 0.041 0.013 +/- 0.061 -0.003 +/- 0.045 -0.006 + 0.031 40-X Ag-1Orm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/30/04 0.097 +/- 0.025 0.170 + 0.160 0.004 +/- 0.021 -0.001 +/- 0.024 0.120 i 0.200 0.008 +/- 0.022 06/10/04 0.136 +/- 0.017 0.100 +/- 0.120 -0.015 +/- 0.015 -0.005 +/- 0.013 -0.010 +/- 0.180 0.003 +/- 0.012 09/22/04 0.073 +/- 0.020 -0.020 +/- 0.120 -0.006 +/- 0.012 -0.001 +/- 0.017 0.060 +/- 0.120 -0.006 i 0.015 11/17/04 0.057 i 0.011 0.019 4 0.081 -0.003 +/- 0.009 -0.003 + 0.010 -0.059 +/- 0.082 0.010 + 0.010

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 19, Oysters (pCi/g wet) Page 3 of 3 Location Collection Isotope Date 40-X Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/30/04 -0.006 +/- 0.059 0.040 +/- 0.051 -0.030 i 0.084 1.960 +/- 0.500 0.001 +/- 0.023 0.021 +/- 0.032 06/10/04 0.003 +/- 0.038 0.018 +/- 0.039 0.040 + 0.110 1.340 +/- 0.270 0.003 +/- 0.011 -0.004 +/- 0.029 09/22/04 -0.002 i 0.051 0.009 +/- 0.036 -0.011 +/- 0.025 1.790 +/- 0.390 -0.003 +/- 0.015 -0.007 +/- 0.018 11/17/04 0.012 +/- 0.024 0.013 +/- 0.031 -0.022 X 0.041 2.190 +/- 0.250 0.002 +/- 0.008 -0.003 +/- 0.014 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/30/04 0.017 +/- 0.024 -0.040 +/- 0.160 0.000 + 0.045 0.051 +/- 0.056 -0.028 i 0.044 0.023 +/- 0.036 06/10/04 -0.011 +/- 0.019 0.110 + 0.110 0.000 +/- 0.029 0.006 +/- 0.043 -0.012 +/- 0.028 0.017 +/- 0.025 09/22/04 -0.003 +/- 0.014 0.010 : 0.150 -0.020 +/- 0.039 0.025 I 0.064 -0.034 + 0.038 0.003 +/- 0.022 11/17/04 -0.004 +/- 0.010 -0.023 +/- 0.072 -0.007 +/- 0.020 0.000 +/- 0.038 -0.004 +/- 0.018 -0.001 +/- 0.017

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 20, Clams (pCi/g wet) Page I of 2 Location Collection Isotope Date 29 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/03/04 -0.007 +/- 0.030 -0.040 + 0.200 0.003 +/- 0.027 0.005 +/- 0.025 -0.270 +/- 0.320 -0.008 + 0.024 06/10/04 0.004 +/- 0.010 0.024 +/- 0.078 -0.005 +/- 0.008 0.007 +/- 0.007 -0.030 +/- 0.110 -0.004 +/- 0.008 08/04/04 0.002 +/- 0.024 -0.040 +/- 0.130 -0.001 +/- 0.015 -0.008 +/- 0.017 -0.220 +/- 0.170 -0.001 +/- 0.018 11/02/04 -0.008 +/- 0.031 0.050 +/- 0.160 0.001 +/- 0.027 0.018 +/- 0.028 -0.200 +/- 0.210 0.011 +/- 0.029 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/03/04 0.020 +/- 0.024 0.045 +/- 0.092 0.180 +/- 0.310 2.220 +/- 0.630 0.017 +/- 0.021 0.018 +/- 0.039 06/10/04 -0.001 +/- 0.008 -0.002 +/- 0.029 0.010 +/- 0.061 1.930 +/- 0.210 -0.002 +/- 0.007 -0.006 +/- 0.011 08/04/04 0.010 +/- 0.015 0.011 +/- 0.048 -0.022 +/- 0.047 1.890 +/- 0.410 -0.015 +/- 0.015 0.008 +/- 0.021 11/02/04 -0.030 +/- 0.026 -0.039 +/- 0.092 0.023 +/- 0.037 1.520 +/- 0.800 -0.004 +/- 0.030 -0.032 +/- 0.035 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/03/04 -0.009 +/- 0.026 0.050 +/- 0.220 0.030 +/- 0.049 -0.094 +/- 0.081 0.006+/- 0.048 0.023 +/- 0.050 06/10/04 0.004 +/- 0.009 -0.003 +/- 0.073 0.002 +/- 0.019 -0.017 +/- 0.029 -0.016 4 0.018 0.006 +/- 0.016 08/04/04 0.006 +/- 0.018 -0.050 +/- 0.140 -0.044 +/- 0.042 0.019 +/- 0.069 -0.040 +/- 0.048 0.010 +/- 0.032 11/02/04 -0.006 +/- 0.028 -0.030 +/- 0.230 0.008 +/- 0.065 -0.033 +/- 0.073 0.000 +/- 0.059 -0.006 +/- 0.048 35-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/03/04 -0.010 +/- 0.042 -0.240 +/- 0.240 -0.027 +/- 0.029 -0.003 +/- 0.034 -0.100 +/- 0.390 0.007 +/- 0.026 06/22/04 -0.006 +/- 0.024 0.060 +/- 0.170 0.004 +/- 0.016 0.006 +/- 0.022 -0.010 +/- 0.210 -0.004 +/- 0.017 08/04/04 0.014 +/- 0.021 0.050 +/- 0.130 -0.001 +/- 0.015 0.004 +/- 0.016 -0.040 +/- 0.170 0.000 +/- 0.013 11/02/04 -0.018 +/- 0.039 0.000 +/- 0.230 -0.017 +/- 0.025 -0.015 +/- 0.032 -0.040 +/- 0.200 0.008 +/- 0.033 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/03/04 -0.006 +/- 0.023 -0.065 +/- 0.092 -0.170 +/- 0.340 1.810 +/- 0.730 0.010 +/- 0.027 -0.004 +/- 0.043 06/22/04 -0.009 +/- 0.016 -0.024 +/- 0.056 -0.087 +/- 0.094 1.950 +/- 0.560 0.014 +/- 0.018 -0.003 +/- 0.025 08/04/04 -0.012 +/- 0.014 -0.034 +/- 0.043 0.016 +/- 0.044 1.730 +/- 0.370 -0.002 +/- 0.013 0.001 +/- 0.019 11/02/04 0.006 +/- 0.023 0.041 +/- 0.082 -0.012 +/- 0.036 1.550+/- 0.730 -0.013 +/- 0.021 0.016 +/- 0.031 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/03/04 -0.021 +/- 0.040 0.050+/- 0.260 0.006 + 0.061 -0.050+/- 0.100 0.028 +/- 0.066 -0.040 +/- 0.039 06/22/04 0.014 +/- 0.022 0.050 +/- 0.180 -0.011 +/- 0.049 0.012 +/- 0.059 -0.021 +/- 0.043 -0.003 +/- 0.032 08/04/04 0.003 +/- 0.016 -0.110 +/- 0.130 0.006 +/- 0.038 -0.004 +/- 0.058 0.036+/- 0.052 -0.006 +/- 0.027 11/02/04 0.003 +/- 0.026 0.150 +/- 0.300 -0.015 +/- 0.071 -0.008 +/- 0.089 0.010 +/- 0.074 0.011 +/- 0.044 38 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/03/04 0.021 +/- 0.036 0.210 + 0.250 -0.007 +/- 0.026 0.003 + 0.028 -0.170 +/- 0.360 0.013 +/- 0.022 06/22/04 -0.016 +/- 0.021 -0.070 +/- 0.150 -0.005 +/- 0.018 -0.008 +/- 0.022 -0.050 +/- 0.150 -0.013 +/- 0.020 08/04/04 -0.008 +/- 0.025 0.070 +/- 0.130 -0.011 +/- 0.019 0.017 +/- 0.020 0.070 +/- 0.150 0.011 +/- 0.016 11/02/04 -0.006 +/- 0.048 0.210 +/- 0.220 -0.012 +/- 0.026 0.004 +/- 0.032 0.040 +/- 0.210 -0.013 +/- 0.028 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/03/04 0.019 +/- 0.027 0.094 +/- 0.084 0.070 +/- 0.420 1.880 +/- 0.710 -0.016 +/- 0.026 -0.005 +/- 0.037 06/22/04 0.009 + 0.017 0.003 +/- 0.063 0.014 +/- 0.071 1.580 +/- 0.520 -0.010 +/- 0.019 -0.007 +/- 0.025 08/04/04 0.008 +/- 0.018 0.039 +/- 0.050 -0.006 +/- 0.048 2.190 +/- 0.480 0.007 +/- 0.018 0.005 +/- 0.022 11/02/04 0.028 +/- 0.034 -0.021 +/- 0.081 0.009+/- 0.036 1.360+/- 0.740 -0.004 +/- 0.024 0.016+/- 0.031

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 20, Clams (pCi/g wet) Page 2 of 2 Location Collection Isotope Date 38 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/03/04 0.017 +/- 0.039 0.060 +/- 0.230 0.083 +/- 0.064 0.050 +/- 0.120 0.018 +/- 0.058 0.013 +/- 0.049 06/22/04 -0.012 +/- 0.020 -0.030+ 0.150 0.000 +/- 0.042 0.035 + 0.059 0.041 +/- 0.041 -0.037 +/- 0.040 08/04/04 0.001 +/- 0.018 -0.110 +/- 0.180 -0.021 +/- 0.043 -0.043 +/- 0.063 -0.014 +/- 0.044 -0.004 +/- 0.034 11/02/04 0.023 +/- 0.028 0.090 +/- 0.290 0.008 +/- 0.052 0.011 +/- 0.098 0.050 +/- 0.072 0.026+/- 0.052 39-X Ag-lOim Be-7 Co-58 Co-60 Cr-51 Cs-134 02/02/04 -0.002 +/- 0.017 0.040 + 0.160 -0.002 +/- 0.014 -0.005 +/- 0.020 0.030 +/- 0.180 -0.006 +/- 0.021 06/08/04 0.013 +/- 0.026 0.030 +/- 0.150 0.007 +/- 0.019 0.005 +/- 0.021 0.010 + 0.200 0.007 +/- 0.019 09/08/04 0.013 +/- 0.020 -0.020 +/- 0.140 -0.019 +/- 0.022 -0.008 + 0.023 0.010 +/- 0.120 -0.001 + 0.013 11/02/04 -0.021 +/- 0.033 -0.140 +/- 0.230 -0.029 +/- 0.034 -0.009 +/- 0.032 -0.060 +/- 0.200 0.008 +/- 0.026 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 02/02/04 0.002 +/- 0.019 0.019 +/- 0.046 0.032 +/- 0.039 2.060 +/- 0.490 -0.009 +/- 0.018 -0.004 +/- 0.021 06/08/04 -0.006 +/- 0.022 0.010 +/- 0.065 -0.021 +/- 0.043 1.710 +/- 0.550 -0.002 +/- 0.023 0.003 +/- 0.026 09/08/04 0.005 +/- 0.018 -0.027 +/- 0.042 -0.011 +/- 0.018 1.280 + 0.470 0.012 +/- 0.018 0.005 +/- 0.021 11/02/04 0.012 +/- 0.034 0.045 +/- 0.090 -0.020+ 0.036 1.460+/- 0.800 -0.007+/- 0.026 0.014 +/- 0.039 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 02/02/04 0.007 +/- 0.019 -0.170 +/- 0.200 0.008 +/- 0.046 -0.017 +/- 0.067 0.004 +/- 0.038 0.028 +/- 0.037 06/08/04 0.000 +/- 0.023 0.090 +/- 0.200 0.009 +/- 0.055 -0.077 +/- 0.083 0.017 +/- 0.040 -0.006 +/- 0.034 09/08/04 -0.006 +/- 0.018 -0.080 +/- 0.170 -0.011 +/- 0.048 -0.029 +/- 0.058 -0.025 +/- 0.044 0.010 +/- 0.029 11/02/04 0.007 +/- 0.034 -0.170 +/- 0.290 0.033 +/- 0.081 0.060 +/- 0.120 -0.057 +/- 0.075 0.009 +/- 0.057

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 22, Lobsters (pCi/g wet) Page l of 2 Location Collection Isotope Date 32 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/24/04 -0.004 +/- 0.015 -0.010 + 0.100 0.009 +/- 0.013 0.002 +/- 0.010 0.030 +/- 0.150 0.003 +/- 0.011 06/01/04 0.010k 0.031 0.030 0.200 -0.007k 0.018 0.005 +/- 0.022 0.160+/- 0.220 -0.005 +/- 0.018 08/23/04 0.010 +/- 0.026 0.070 i 0.140 -0.002 +/- 0.017 -0.007 +/- 0.020 0.130 +/- 0.170 -0.007 +/- 0.016 10/20/04 0.022 +/- 0.046 -0.080 1 0.260 -0.005 +/- 0.025 0.010 +/- 0.022 0.140 +/- 0.360 0.006 +/- 0.036 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/24/04 0.008 +/- 0.011 -0.001 +/- 0.036 0.110 +/- 0.120 2.140 +/- 0.290 -0.006 +/- 0.011 0.023 +/- 0.018 06/01/04 0.022 +/- 0.028 0.052 +/- 0.073 0.017 +/- 0.073 2.220 +/- 0.620 -0.016 +/- 0.021 -0.015 +/- 0.025 08/23/04 -0.008 +/- 0.018 0.016 +/- 0.053 -0.003 +/- 0.051 1.860 +/- 0.450 -0.001 +/-0.015 -0.016 +/- 0.019 10/20/04 -0.012 +/- 0.030 -0.030 +/- 0.110 0.040

  • 0.110 2.450 +/- 0.830 -0.011 +/- 0.025 -0.009 +/- 0.037 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/24/04 -0.009 +/- 0.017 0.010 +/- 0.100 0.016 +/- 0.026 0.042 +/- 0.045 -0.014 +/- 0.026 0.007 +/- 0.023 06/01/04 0.018 +/- 0.023 -0.230 +/- 0.240 -0.045 +/- 0.057 -0.027 +/- 0.078 0.006 +/- 0.053 -0.003 +/- 0.037 08/23/04 -0.018 +/- 0.018 0.010+ 0.150 -0.011 +/- 0.039 0.025 +/- 0.058 0.000* 0.037 0.017* 0.033 10/20/04 0.004 +/- 0.031 -0.090 +/- 0.210 -0.014 +/- 0.071 0.007 +/- 0.097 -0.094 +/- 0.065 -0.013 +/- 0.056 35 Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/11/04 0.004 +/- 0.005 0.019 +/- 0.048 0.003 +/- 0.005 -0.002 +/- 0.004 -0.077 +/- 0.082 0.002 +/- 0.004 06/01/04 0.007 +/- 0.028 0.040 +/- 0.180 -0.025 +/- 0.024 -0.003 +/- 0.031 -0.030 +/- 0.190 -0.002 i 0.020 08/23/04 -0.003 +/- 0.017 0.110 +/- 0.120 -0.010 + 0.013 0.012 +/- 0.014 -0.050 +/- 0.110 0.009 +/- 0.014 10/20/04 0.011 +/- 0.038 0.000 +/- 0.190 -0.030 + 0.022 0.018 +/- 0.022 0.120 +/- 0.250 0.020 +/- 0.023 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/11/04 0.005 +/- 0.004 -0.015 +/- 0.018 -0.040 +/- 0.110 1.630 + 0.150 0.000
  • 0.004 0.005 +/- 0.008 06/01/04 0.005 +/- 0.018 0.030 +/- 0.071 -0.008 +/- 0.059 2.100 +/- 0.630 -0.006 +/- 0.021 0.005 +/- 0.032 08/23/04 0.004 + 0.014 -0.012 + 0.049 -0.013 + 0.036 2.130 +/- 0.450 -0.004 + 0.013 -0.004 +/- 0.020 10/20/04 -0.002 +/- 0.023 0.000 +/- 0.072 -0.011 +/- 0.097 1.420 +/- 0.510 0.003 +/- 0.019 -0.020 +/- 0.032 Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/11/04 0.002 +/- 0.007 -0.025 +/- 0.038 0.003 + 0.010 0.024 +/- 0.040 -0.007 +/- 0.010 0.003 +/- 0.010 06/01/04 0.001 +/- 0.021 0.040 + 0.190 -0.015 +/- 0.042 0.026 +/- 0.077 -0.055 +/- 0.058 -0.001 +/- 0.042 08/23/04 -0.004 +/- 0.014 0.030 +/- 0.100 0.005 +/- 0.037 -0.004
  • 0.047 0.000 +/- 0.036 -0.006 +/- 0.030 10/20/04 0.007 +/- 0.023 -0.090 +/- 0.190 0.045 +/- 0.056 0.080 +/- 0.110 0.050 i 0.110 -0.008 +/- 0.043 37-X Ag-lOrm Be-7 Co-58 Co-60 Cr-51 Cs-134 03/16/04 0.003 +/- 0.008 0.044 +/- 0.062 -0.003 +/- 0.008 0.004 +/- 0.007 -0.037 +/- 0.099 0.001 + 0.007 06/04/04 0.016 +/- 0.034 -0.040 +/- 0.170 -0.005 +/- 0.023 -0.010 +/- 0.021 -0.030 +/- 0.220 0.014
  • 0.020 09/20/04 0.006 +/- 0.026 -0.100 +/- 0.180 0.006
  • 0.021 0.025 +/- 0.029 -0.070 +/- 0.200 0.008 +/- 0.022 11/09/04 -0.012 +/- 0.021 -0.040 +/- 0.130 0.002
  • 0.018 -0.004 + 0.017 0.010 +/- 0.190 -0.015 +/- 0.017 Cs-137 Fe-59 1-131 K-40 Mn-54 Nb-95 03/16/04 0.007 +/- 0.006 -0.023 +/- 0.029 -0.024 + 0.094 2.160 +/- 0.180 0.004 +/- 0.006 -0.011 +/- 0.012 06/04/04 -0.010
  • 0.025 0.004 +/- 0.077 0.024 4 0.049 2.220 +/- 0.660 -0.003
  • 0.019 0.002 +/- 0.029 09/20/04 -0.007 +/- 0.025 0.007 +/- 0.075 -0.015 +/- 0.046 2.000 +/- 0.580 0.000 +/- 0.018 -0.024 + 0.030 11/09/04 -0.002 +/- 0.018 -0.025 + 0.057 0.000 +/- 0.075 2.310 +/- 0.450 0.011 + 0.018 0.007 +/- 0.036

Dominion Nudear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Table 22, Lobsters (pCi/g wet) Page 2 of 2 Location Collection Isotope Date 37-X Ru-103 Ru-106 Sb-125 Th-228 Zn-65 Zr-95 03/16/04 -0.005 +/- 0.009 0.013 + 0.048 0.001 +/- 0.014 0.002 +/- 0.027 -0.002 +/- 0.016 0.001 +/- 0.014 06/04/04 -0.014 +/- 0.021 -0.030 +/- 0.190 -0.066 +/- 0.056 0.008 +/- 0.076 0.000 +/- 0.065 0.028 +/- 0.038 09/20/04 -0.013 +/- 0.022 -0.090 +/- 0.220 -0.029 +/- 0.057 -0.010 +/- 0.100 -0.069 +/- 0.055 0.006 +/- 0.046 11/09/04 0.009 +/- 0.018 0.010 +/- 0.130 0.013 + 0.039 0.052 +/- 0.064 0.009 +/- 0.080 -0.005 +/- 0.028

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 NOTES FOR DATA TABLES

  • All Second Quarter TLD's were lost (CR-04-07177, also see Section 2.2 for more details)
  1. Collection Dates for Air Particulates and lodines are listed as Monday -Sunday, however the typical change-out days are on Tuesdays A Low volume (6337 cubic feet) caused by GFI failure (see CR-04-04034)

B Low volume (6275 cubic feet) caused by power outage (see AFI # 1, REMP Self Assessment Report MP-SA-04-09)

C Low volume (392 cubic feet) caused by blown fuse (CR 07008)

D Low volume (4020 cubic feet) due to GFI breaker trip (CR 1114)

E Low error since sensitivity was increased due to overnight count F Hay samples G No samples of hay obtained in December since property and goats were sold H Only 1 liter of sample obtained in March. Insufficient size to perform all analyses, therefore vendor did not perform H-3 analyses. Onsite analysis of the water from these wvells indicated H-3 was less than 1740 pCi/liter (LLD value, 4.66 a)

I First Quarter flounder samples were not available (18 trawls made without any fish six inches or larger being obtained)

J High error due to inadequate sample analysis scheduling (Framatome CR)

K During December the sample tray located at Black Point was missing. High winds and stormy sea conditions caused tray to be ripped from its chain bridle; tray found washed-up on shore and badly damaged. All oysters were lost.

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004

4. DISCUSSION OF RESULTS This section summarizes the results of the analyses of environmental media sampled. 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 quarter using CaSO 4 (Tm) Panasonic model UD-804 ASx thermoluminescent dosimeters (TLDs). In 2000, the TLDs (Victoreen glass bulb CaF2 (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 REMODCM. 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).

Three more locations (73X, 74X and 75X were added in mid-2003 to prepare for monitoring the potential effect of the Independent Spent Fuel Storage Installation - Dry Cask Storage (ISFSI). Two storage containers are scheduled to be loaded with spent fuel assemblies in the first quarter of 2005. The exposure backgrounds from these three locations will be used' to determine the radiological effects in the vicinity of the ISFSI by comparing to future measurements. The average exposure rate measured over the one and a half years at these locations was: 9.5 uC/hr at location 73X; 7.6 gR/hr at location 74X; and 6.9 gR/hr at location 75X.

4-1

Dominion Nucicar Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 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),

Corey Road (location 48) and Site Switchyard Fence (location 73X) experience higher exposure rates due to their proximity to granite beds and stonewalls. In addition, the Ledyard control location (location 14C) experiences relatively higher background exposure rate than the other control locations at Mystic, Norwich, and Old Lyme (locations 13C, 15C, and 16C). The only appreciable effect seen in the 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 yiR/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 are influenced by natural background exposure differences caused by the many granite out-croppings typical of the Millstone area. As shown in Figure 4.1-1, the annual average of the critical indicator 4-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 location is slightly higher in gamma exposure rate than the average control gamma exposure rate. This difference is the result of the nearby granite. For conservatism, if the difference was the result of plant operation (e.g., storage of radioactive waste on-site, gaseous effluents, etc.) an assessment of the resulting dose consequence, assuming constant year-round residency, is shown in Section 5 as not exceeding 3.9 mrem.

The Second Quarter TLDs were lost in transit to the vendor.

Millstone also uses Area Monitoring TLDs around various areas of the RCA boundary as an indication of possible changes in site exposure. A review of the all four quarters of data from this independent program indicated a slight decrease in levels from 2003. Therefore, no effects of the plant were likely during the time frame when the environmental program TLDs were lost.

4.2. Air ParticulateGross Beta Radioactivity (Table 2)

Air is continuously sampled at one outer ring and seven inner ring locations by passing it through glass fiber particulate filters. These 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 outer ring monitoring locations continue to show no 4-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 significant variation in measured activities (see Figure 4.2-2). This indicates that any station contribution is not measurable.

Figure 4.2-1 MILLSTONE AIR PARTICULATE pCVm3 2004 Gross Beta Radioactivity 0.035

+Indicator Controls 0.03 0.025 -

0.02 -

0.015-0.01 .

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 4-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 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 I-131 were seen in the 2004 charcoal samples.

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 processes. No other positive results were seen. These analyses indicate the absence of station effects.

4.5. Air Particulate Strontium (Table 5)

Table 5 in past years was used to report the measurement of Sr-89 and Sr-90 in quarterly composite air particulate filters. Because previous data has shown the lack of detectable station activity in this media, the requirement for these measurements was removed from the Radiological Effluent Monitoring Manual (REMM) and analyses have been discontinued. The fact that milk samples are a much more sensitive indicator of fission product existence in the environment, prompted the decision for discontinuation. In the event of widespread station related contamination or special events such as the Chernobyl incident, these measurements may be made. Historically, when world events created conditions that caused detectable measurements of these nuclides, no difference was noted between indicator and control locations. This further confirms that these detectable levels 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.

The discontinuance of these samples was largely due to the fact that, previous sample results never indicated any detectable station activity. Similarly, no station detectable activity has been seen in soil samples taken since the resumption of these samples.

The results of these samples, also allows for the determination of baseline activity levels in soil. This is particularly important for Cs-137, since significant levels from past weapons testing fallout 4-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 remain in the soil. Baseline levels will prove useful years from now when site characterization and decommissioning of the station become the focus during preparations for License termination.

This media is collected quarterly from one control and two indicator locations.

4.7. Cow Milk (Table 7)

The most sensitive indicator of fission product existence in the terrestrial environment is usually milk samples. This, in combination with the fact that milk is a widely consumed food, results in this pathway usually being one of the most critical pathways. Since 1996 all dairy (cow) farms close enough to Millstone to be considered an indicator location (i.e. within 10 miles) have been out of business. Therefore, the sampling of cow milk has been discontinued until such time that a new dairy farm starts business. Each year a 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 2004 census can be seen in Appendix A. If a new dairy farm is identified within a distance from Millstone to be considered an indicator location, the collection of cow milk will resume.

4.8. Goat Milk (Table 8)

These samples are collected when milk is available for consumption. The frequency is twice per month during grazing season (April through October) and once per month the remaining year. Each sample is analyzed for I-131 and gamma emitting nuclides. The samples collected within each quarter are composited for each sample location and analyzed for Strontium.

Goat milk samples are typically a more sensitive indicator of fission products in the terrestrial environment than cow milk samples.

The uptake of radionuclides in milk is dependent on a number of parameters, including: metabolism of these animals, feeding habits, and feed type. Similar to previous years, Cs-137 and Sr-90 were 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, location 22 (5.2 Mi.

NNE, sampled only sincel994), exhibits this trend showing higher 4-6

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Sr-90 and Cs-137 concentrations than at some other locations, including ones closer to Millstone. The presence of 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 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 produced in Connecticut.

The results indicate no detectable I-131 in this media. No plant related detectable levels of 1-131 have been seen in goat milk samples for approximately 20 years. The only other occasions where I-131 was detected were the Chinese Weapons Tests of the mid to late 1970's and the fallout from 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 cannot be collected (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 unavailable.

No station effects were seen in pasture grass and feed samples.

Cosmic produced Be-7 was observed in the majority of the pasture grass samples and the fourth quarter hay samples. Due to its relatively short half-life (52 days), it was not detected in the hay samples. The K-40 (naturally occurring nuclide) was a factor of two times higher in hay (compared to pasture grass). Similar to goat milk, the Cs-137 values at indicator and control locations are comparable and would indicate that the levels observed are the result of residual weapons testing fallout.

4.10. Well Water (Table 1O)

Millstone resumed collection of well water as a required media type in the fourth quarter of 2003. It was discontinued in 1986 since 4-7

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 no detectable station activity was ever observed. However, to better assure prompt indication of any potential effects of plant operation, the analysis of these samples has resumed. No station detectable activity is seen in the well water samples taken in 2004.

4.11. Reservoir Water (Table II)

Reservoir water samples are special samples not required by the REMM. 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. Cosmic produced Be-7 was noted in the indicator lettuce and swiss chard samples. Naturally occurring K-40 was detected in all samples.

4.13. Broad Leaf Vegetation (Table 13)

This media can be an early and sensitive indicator of releases from the station from both unplanned releases and normal operations.

Therefore, to enhance program-monitoring effectiveness, samples of broadleaf vegetation are collected monthly during the growing season, April - October, even though requirements are to collect twice a year.

Most samples had detectable levels of cosmic produced Be-7.

Positive indications of Cs-137 were observed in two samples. The levels are due to fallout and are comparable to those observed in past years. This media did not show any station effects.

4.14 Seawater (Table 14)

Seawater samples from the Vicinity of Discharge (32) are obtained from a continuous sampler located at the end of the quarry (where the station discharge is undiluted). The samples from this location are collected weekly and composited for monthly analyses.

Samples from Giants Neck (37C) are quarterly composites of weekly grab samples. Millstone increased the required sampling 4-8

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 frequency for composite samples from the Vicinity of Discharge to a monthly basis to increase monitoring effectiveness. In 2003, the LLD for H-3 was lowered by approximately a factor of four to further. enhance monitoring effectiveness. This lower LLD was continued in 2004.

Naturally occurring K-40 was seen all but two of the samples.

Measured plant related levels of H-3 inseawater from the immediate vicinity of discharge (location 32) were observed in seven of the 12 samples (slightly less frequent then in 2003). As discussed above, this sample is taken directly from liquid effluent flow prior to dilution into the Long Island Sound. Dilution studies performed on 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 in each fuel cycle. It is generated during operation from fission and neutron reactions.

For approximately the last 10 years, H-3 has typically been below detectable levels because of the change in analysis technique.

Figure 4.14-1 shows a ten-year trend of tritium releases in Millstone liquid effluents versus 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. A review of previous years' trends indicated that lowering the LLD for tritium for location 32 would make an enhancement to the monitoring program. 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 4.14-1 since it takes into account the dilution flow during each month. This flow can change substantially during plant outages. By plotting the data monthly, the resolution of the comparison is also enhanced.

4-9

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Figure 4.14-1 MILLSTONE LIQUID H-3 RELEASE VERSUS SEAWATER CONCENTRATION 1500 12 Year Historical Trend 1400-1300 - -Curies 1200 -

1100- -* pCi l/te 900 r 800 700-600- A Soo'-

400 A A l 300 ,,

200 100 +/-+/-

0 Figure 4.14-2 MILLSTONE Seawater - Tritium 2004 Samples vs. EMuent Measurements 2000 1800 - 4Seawater Samples

-60 Effluent Measurements 1600 - -

140 1200--

pCI/I 1000 /

600 400 200 0 It Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 4-10

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 4.15. Bottom Sediment (Table 15)

Similar to last year, Cs-137 was detected in the samples from Golden Spur (67X). This is an estuarine area at the mouth of a small brook where sediments are covered with freshwater during ebb tides nearly every day. The levels of Cs-137 at this location are comparable to those observed in past river water sediments taken from the Connecticut River. Because of the relative distance and direction of the Golden Spur location from the station and comparable levels are seen at even much farther locations, the Cs-137 detected at Golden Spur is from weapons testing fallout.

Cs-137 was also detected once (fourth quarter sample) in samples from West Jordan Cove (29) and twice (third and fourth quarter "extra" samples) in the samples from Jordon Cove Bar (39X). The levels at Jordan Cove Bar are similar to those at Golden Spur and likely exhibit the effect of the fresh water drainage from Jordan Brook. The levels at West Jordan Cove were significantly less.

Although these levels may be the result of fallout, the samples from Jordan Cove Bar also indicated detectable quantities of Co-60.

Therefore, these levels are considered plant related activity.

Excluding the even smaller levels that were detected last year, plant related activity has not been detected in bottom sediment for over a decade. The levels detected are comparable to the levels observed in 1990. Bottom sediment is not a dose pathway to man and therefore the presence of radioactivity in bottom sediment does not pose any dose consequences. Examinations of aquatic media sampled from the same sampling locations (discussions that follow) do not show any detectable Co-60 or Cs-137.

4.16. Aquatic Flora (Table 16)

Sampling of this media provides useful information since it is very sensitive to station discharges. However, similar to the last several years, no station related radioactivity was detected in aquatic flora in 2004. Although one sample from Black Point (36) had a positive indication of 1-131, it was not detected at any of the locations closer to the station (locations 29,32 and 35) and not detected in follow-up samples taken three weeks later. The vendor noted that this sample had an unusual odor indicating that it may have been contaminated with some type of waste. Therefore, this unusual positive result is suspected to be the result of contamination with residual activity from the medical administration of this nuclide.

4-11

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 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.

4.18. 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.

These oysters have been obtained from location 68Z for the last several years. To enhance the program, the oysters from location 68Z have also been analyzed. Trays are kept at most sampling areas to guarantee samples and facilitate sample collection. Native oysters are sampled at the Quarry (40X), which is an extra location.

Station related Ag-lOm was observed in only two of the four samples from within the Vicinity of Discharge (32) and all four samples from the Quarry (40X). Although location 32 is labeled as the Vicinity of Discharge, for this sample type the actual location is actually at the end of the quarry (where the discharge water is still undiluted). No station related activity was observed in samples from beyond the station discharge area.

In years past, high levels of Zn-65 were typically observed in oysters 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 exists 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 4-12

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 discharges of Zn-65 in liquid effluents have dropped to no detectable activity in 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 a similar trend of Ag-i10m concentration in quarry oysters compared with liquid effluent curies of Ag-lOim discharged. Again, the dependency between Ag-i brOm discharged and the Ag-11Om concentration measured in the native quarry oysters is apparent. The historical sensitivity between station measured effluent discharges of Zn-65 and Ag-i bOm when compared to environmental measured concentrations has provided a basis for Millstone to adjust the bioaccumulation factors for Zn-65 and Ag-i i0m used in the standard industry effluent dose consequence codes. See Section 5 of this year's and previous years' Annual Radiological Environmental Operating Reports for a comparison of the two methods which has allowed for such adjustments in the past (i.e., dose from the station's measured radioactive discharges input into conservative models versus actual measurements of the concentrations of radioactivity in environmental media to calculate annual dose commitment from consumption).

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 2004.

4-13

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 4.21. Scallops (Table 21)

Scallops are not required by the REMM. However, attempts are made to sample this media to confirm station effects because scallops are available for public consumption. No scallop samples were available in 2004.

4.22. Lobsters (Table 22)

Like the last several years, no station related radioactivity was detected in this sample media in 2004.

4-14

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Figure 4.19-1 Zn-65 COMPARISON Curies Curies Discharged vs. Native Oyster Conc. Conc. (pC~gram) 0.1 _ . -100 ischarged

onc.

0.01 _ -10 0.001 ~- 1 0.0001 - 0.1 0.00001 0.01 0.000001 m,-y 0.001 Quarter Figure 4.19-2 Ag-110m COMPARISON Curies Curies Discharged vs. Native Oyster Conc. Conc. (pCVm)gram) 0.1 - t ~

+Curies Discharged . 100 0.01 o0.1 Oyste Con 1 10 0.0001 0.1 0.1 0.00001 0.01 00 0.000001 0.001 Quarter 4-15

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004

5. OFFSITE DOSE EQUIVALENT COMMITMENTS The off-site dose consequences (dose equivalent commitments) of the stations' radioactive liquid and airborne effluents have been evaluated using two methods.

The first method utilizes calculations of direct dose from sources onsite and the stations' 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 Effluent Monitoring Manual,Section I.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 = 0.17 mrem GI(LLI) = 0.01 1 mrem The organ GI(LLI) (Gastrointestinal Tract, Lower Large Intestine) dose is essentially all attributable to the liquid pathway. The majority of the whole body dose is due to a conservative determination of dose (-0.14 mrem) to the nearest resident as a result of direct radiation from on-site radioactive waste operation/storage facilities and continuous occupancy. The whole body and maximum organ dose attributable from station effluents includes conservative assessments using Method 2.

5-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 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.

To provide perspective on the doses in Table 5.1, the standards for 2004 on the allowable maximum dose to an individual of the general public are given in 40CFR190 as 25 mrem 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.

5-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 TABLE 5.1 COMPARISON OF DOSE CALCULATION METHODS MILLSTONE POWER STATION 2004 Annual Dose (millirem)

Method 1 -: M1)ethod 2 Pathway Individual Organ Unit 1 Unit 2 Unit 3 . Station Station (BWR) (PWR) (PWR -Total:

irbornteEfflutents

1. External Gamma Max(2 ) Whole Body 0.0024 0.0019 0.022 0.026 ND(7)

Dose DirectDose Nearest Residence Max( 2) Whole Body N/A N/A N/A -0.14(4) <3.9(5)

I I

5-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 TABLE 5.1 (Cont.)

COMPARISON OF DOSE CALCULATION METHODS MILLSTONE POWER STATION 2004 Annual Dose (millirem)

Max: M:: - .. . Method l)-

Pathway  : .: Individual .Organ Unit 1 Unt Unit 3 . Station' Station (BWR) (PWR) (PWR) Total .

Liquid Effluents

1. Fish
  • Adult Whole Body 0.000004 0.00012 0.00063 0.00076 ND( 3 )

Teen 0.000002 0.00010 0.00057 0.00067 Child 0.000001 0.00010 0.00059 0.00069

  • Adult GI(LLI)(6) 0.000001 0.00076 0.0047 0.0055 ND Teen 0.000001 0.00055 0.0034 0.0040 Child 0.000001 0.000023 0.0014 0.0016 Adult Liver 0.000005 0.00022 0.0013 0.0015 ND
  • Teen 0.000005 0.00021 0.0013 0.0015 Child 0.000004 0.00019 0.0012 0.0014
2. Shellfish
  • Adult Whole Body 0.000001 0.000080 0.00056 0.00064 0.000013(8)

Teen 0.000000 0.000076 0.00056 0.00064 0.000014 Child 0.000000 0.000094 0.00068 0.00078 0.000015

  • Adult GI(LLI) - 0.0010 0.0041 0.0051 0.0091(8)

Teen - 0.0007 0.0029 0.0036 0.0063 Child - 0.0003 0.0011 0.0014 0.0022 Adult Liver 0.000001 0.00023 0.0016 0.0018 0.000022(8)

  • Teen 0.000001 0.00023 0.0017 0.0019 0.000022 Child 0.000001 0.00024 0.0016 0.0019 0.000019 5-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 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 operation/storage of radioactive waste facilities. Storage of radioactive waste in areas designated onsite is limited by design and operation to ensure that the maximum direct dose from each area at the site boundary does not exceed one millirem. Actual exposure from each facility 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 skyshine. These maximum estimated doses from each facility were summed for a cumulative site commitment of approximately 0.14 millirem. The whole body dose from liquid effluents was 0.00175, which results in a total estimated whole body dose to the maximum individual of 0.168 mrem (0.14+.0261+.00175).
5. Measured dose was derived from quarterly 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 evaluation 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. ND - Not Detectable - measurements for 2004 show no detectable station related activity. TLD's cannot detect levels that are such a small fraction of natural background.
8. Based on measured levels in 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.

5-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004

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 problem because this product is widely consumed and several fission products readily concentrate in this media. Some of these fission products, such as I-131 and Sr-89 are relatively short-lived. Therefore they result from either station effluents, nuclear weapons tests or nuclear incidents (e.g. Chernobyl). Sr-89's lifetime is longer than I-131's, therefore it must be remembered that 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 problem. 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 a difficult problem.

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)IThe 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.

6-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 20W4 (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.

(5) Local variability -of Sr-90 and Cs-137 in milk is common throughout the United States. Due to the variability in soil conditions, pasturing methods, rainfall, etc., it is the rule rather than the exception. Therefore, it is not surprising that certain farms have higher levels of radioactivity than other farms. In fact, in the past there are some cases where the farms further from the station have higher Sr-90 and Cs-137 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 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.

6-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 Figure 6-1 Strontium-90 in Milk pCiAiter 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 Year Figure 6-2 Cesium-137 in Milk 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 Cr 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 2004 APPENDIX A LAND USE CENSUS FOR 2004 A-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 TABLE A-1 Dairy Cows Within 15 miles of Millstone Point- 2004 n;epet;nn i~ ALrcllq- q- I" A n;c:tenrsb # of Cows N 14 Mi 55 NE 13.5 Mi 50 WNW 11 Mi 80 NNW 13 Mi 230*

NW 10.3 Mi 9 Note: No cowfanns on this list are usedfor sampling, allfarms aregreaterthan ten milesfromt plant.

  • Last year's numbers, unable to contact A-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 TABLE A-2 Dairv Goats Within 20 miles of Millstone Point- 2004 Direction Distance Sample Location # of Goats N 2Mi LOCATION 21 6/5*

N 20 Mi 2/2 NNE 5.2 Mi LOCATION 22 8/4 NE 2.7 Mi 4/0 ENE 2Mi 1/0 ENE 13 Mi 2/0 ENE 13.1 Mi 5/1 ENE 16.4 Mi 16/10 WNW 18.1 Mi 6/2 NW 14.1 Mi 3/3 NW 17.3 6/3 NNW 18.5 Mi 28/8 NNW 20.7 Mi 6/2 NNW 29 Mi LOCATION 24 68/22

  • Number of Goats/Nunmberof Milkers
    • Unable To Contact As Of This Time A-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 TABLE A-3 2004 Resident/Garden Surveye Distance to Distance to Downwrind Closest Closest Direction Resident Garden (meters) (meters)

N 1500 1490 NNE 860 870 NE 790 740 ENE 1580 1580 E 1500 1650 ESE 1690 1990 SE

  • S SSW SW 3700 3840 WSW 3190 3210 W 2870 2950 WNW 2470 2470 NW 770 2180 NNW 740 1020
  • N/A - not applicable(over water sector) e Distanceswere measured in 2003 using GPS.

A-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 APPENDIX B DNC (A PROGRAM B-I

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 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 Framatome ANP DE&S 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 Health Physics Operations Procedure RPM 2.9.13, "Quality Control of Radiological Environmental Monitoring Program Sample Analyses" and RPM 2.9.12, "Quality Control of the Environmental TLD 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 it's 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.

B-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 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 an 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 2004. Results are shown on Table 2. All of the TLD spike tests satisfied procedural criteria. Of 104 individual nuclide analysis results on QA samples, 79 passed the acceptance criteria, a 76% success rate. Since this is an unusually low success rate, the program was investigated. Two of the failures were for tritium analyses; one was just outside the two sigma acceptance criteria (difference was 2.09 sigma) and the other was a factor of two too low (seems to indicate half the spike was missed, since the routine results for seawater samples track remarkable well with the measured effluents, see Figure 4.14-2). Eighteen of the twenty-three other failures were noted for the gamma in water spikes. Self Assessment MP-SA-04-09noted this deficiency (AFI#7 in self assessment report). Follow-up review of the spiking process and sample preparation indicated a low bias (consistent with the low results) for the low range (adjustable) micropipette.

The results for the December spikes significantly improved. Procedures have been revised to minimize the errors associated with pipette use.

B-3

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 TABLE I 2004 QUALITY CONTROL SAMPLES TYPE Oi SAMPLES TP- l0 - ROUTINE SAMPLES-

-S;1 a TLD Spike 16 (Note 2) 160 Milk - Strontium 2 (Note 3) 12 Milk - Iodine 2 -30 Milk - Gamma (Note 4) -30 Pasture Grass/Hay - Gamma (Milk Substitute) 0 -30 Water - Gamma 12 28 Water - Tritium 4 28 Fish/Invertebrate - Gamma 4 80 Vegetation/Aquatic Flora/SedimentlSoil - Gamma 0 81 Air Particulate - Gross Beta 6 416

- Iodine 2 416

- Gamma 4 32 FOOTNOTE (Table 1):

1. All samples are spikes except fish/invertebrate which are duplicate oyster samples.
2. A set of four TLDs are spike quarterly for readout during the routine quarterly readout.
3. One sample with Sr-89 and Sr-90 and one sample with Sr-90 only.
4. Gamma in water QA spikes are treated as milk surrogates.

TABLE 2 RESULTS OF 2004 QUALITY CONTROL SAMPLE ANALYSES iSAMPLE TYPE .-ANALYSES PASSED , ,i.ANALYSESFAILED.

TLD Spike 12 0 Milk- Strontium 3 (Note 1) 0 Milk - Iodine 2 0 Water- Gamma 46 (Note 1) 18 (Note I)

Water - Tritium 2 2 Oysters - Gamma 3 1 Air Particulate - Gross Beta 6 0 Iodine 2 0 Gamma 15 4 TOTALS TLDs: 12 TLDs: 0 Individual Nuclides: 79 Individual Nuclides: 25 (Note 2)

FOOTNOTE (Table 2):

1. To provide a more detailed comparison of pass versus failure, each nuclide was considered for the gamma and strontium analyses.
2. Self Assessment MP-SA-04-09 noted a significant failure rate for water spikes. The investigation noted a problem with the low range micropipette. Follow-up spikes resulted in a significant reduction in the failure rate.

B4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 APPENDIX C

SUMMARY

OF INTERLABORATORY COMPARISONS C-l

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 INTRODUCTION This appendix covers the Intercomparison Program of the Framatome ANP Environmental Laboratory as required by technical specifications for each Millstone unit. Framatome 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 Framatome and includes:

> milk for gamma (10 nuclides) and low-level (LL) Iodine-131 analyses once per quarter,

> milk for Sr-89 and Sr-90 analyses during the 1st and 3rd quarters,

> 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 4th quarter,

> water tritium analysis during the 2nd and 4th quarters,

> air filter for gamma (9 nuclides) analyses during the 2nd quarter, and

> air filter for gross beta analysis during the 1st and 3rd quarters.

In addition to the Analytics Intercomparison Program, Framatome 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 (QAP), and the Mixed Analyte Performance Evaluation Program (MAPEP).

RESULTS Intercomparison program results are evaluated using FRAMATOME'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 FRAMATOME.

Analytics Intercomparison Program results are included on pages C-3 through C-6 for 2004. A total of 111 analysis results were obtained with 111 passing criteria, a 100% success rate.

C-2

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 FRAMATOME ANP ENVIRONMENTAL LABORATORY ANALYTICS RADIOLOGICAL ENVIRONMENTAL CROSS-CHECK PERFORMANCE EVALUATION Ratio Sample Quarter/ Sample Reported Known E-LABI Number Year Media Nuclide Units Value Value Analytics Evaluation E4057-162 1st04 Water Gross Alpha pCiUL 72.3 74.5 0.97 Acceptable E4057-162 1stV04 Water Gross Beta pCUVL 285.7 301 0.95 Acceptable E4058-162 1st04 Water 1-131 pCUL 94 90.2 1.04 Acceptable E4058-162 1st04 Water 1-131 LL pCVL 88.7 90.2 0.98 Acceptable E4058-162 1stV04 Water Ce-1 41 pCVL 87.5 85 1.03 Acceptable E4058-162 1st04 Water Cr-51 CVL 335 326 1.03 Acceptable E4058-162 stV04 Water Cs-134 pCi/L 86 89.7 0.96 Acceptable E4058-162 1stV04 Water Cs-1 37 pCVL 185.6 185 1.00 Acceptable E4058-162 1st04 Water Co-58 pCUL 113.2 112 1.01 Acceptable E4058-162 1stV04 Water Mn-54 pCVL 112.3 114 0.99 Acceptable E4058-162 1stV04 Water Fe-59 pCiVL 60.8 56.7 1.07 Acceptable E4058-162 1st04 Water Zn-65 pCi/L 149.1 143 1.04 Acceptable E4058-162 1stV04 Water Co-60 pCUL 151.4 153 0.99 Acceptable E4059-162 1st/04 Water Sr-89 pCi 107.7 123 0.88 Acceptable E4059-162 1st04 Water Sr-90 pCi 14.85 14.5 1.02 Acceptable E4060-162 1st04 Filter Gross Alpha pCi/L 48.09 58.9 0.82 Acceptable E4060-162 1stV04 Filter Gross Beta pCVL 231.1 218 1.06 Acceptable E4061-162 1st04 Milk 1-131 pCVL 77.73 77.7 1.00 Acceptable E4061 -162 1stV04 Milk 1-131 LL pCVL 83.6 77.7 1.08 Acceptable E4061-162 1st04 Milk Ce-141 pCVL 92 85.2 1.08 Acceptable E4061 -162 st/04 Milk Cr-51 pCVL 314 327 0.96 Acceptable E4061 -162 1st04 Milk Cs-134 pCi/L 88.7 90 0.99 Acceptable E4061-162 1st04 Milk Cs-137 pCVL 188.6 185 1.02 Acceptable E4061-162 1st04 Milk Co-58 pCVL 115 112 1.03 Acceptable E4061-162 1st/04 Milk Mn-54 pCUL 114.7 114 1.01 Acceptable E4061-162 1stV04 Milk Fe-59 pCVL 59.7 56.8 1.05 Acceptable E4061-162 1st04 Milk Zn-65 pCVL 145.5 143 1.02 Acceptable E4061-162 1st/04 Milk Co-60 pCVL 154.8 153 1.01 Acceptable E4062-162 1stV04 Milk Sr-89 PCi 86.2 103 0.84 Acceptable E4062-162 1st04 Milk Sr-90 pCi 12.7 12.1 1.05 Acceptable C-3

Dominion Nuclear Connecticut. Inc. Annual Radiological Environmental Operating Repon Millstone Station 2004 FRAMATOME ANP ENVIRONMENTAL LABORATORY ANALYTICS ENVIRONMENTAL CROSS CHECK PROGRAM PERFORMANCE EVALUATION Ratio Sample Quarter/ Sample Reported Known E-LAB/

Number Year Media Nuclide Units Value Value Analvtics Evaluation E4182-162 2nd/04 Water H-3 pCi/L 11680 11900 0.98 Agreement E4183-162 2nd/04 Filter Gross Alpha pCi 46.8 48.8 0.96 Agreement E4183-162 2nd/04 Filter Gross Beta pCi 156 160 0.98 Agreement E4184A-162 2nd/04 Filter Ce-1 41 pCi 86 88.3 0.97 Agreement E4184A-162 2nd/04 Filter Cr-51 pCi 127 128 0.99 Agreement E4184A-1 62 2nd/04 Filter Cs-1 34 pCi 54 56.9 0.94 Agreement E4184A-162 2nd/04 Filter Cs-137 pCi 90 87.8 1.03 Agreement E4184A-1 62 2nd/04 Filter Co-58 pCi 27 26 1.03 Agreement E4184A-162 2nd/04 Filter Mn-54 pCi 42 39.7 1.06 Agreement E4184A-162 2ndl04 Filter Fe-59 pCi 27 25.1 1.09 Agreement E4184A-1 62 2nd/04 Filter Zn-65 pCi 62 56 1.11 Agreement E4184A-1 62 2nd/04 Filter Co-60 pCi 92 96.8 0.95 Agreement E4185-162 2nd/04 Filter Sr-89 pCi (1)

E4185-162 2nd/04 Filter Sr-90 pCi (1 E4186-162 2nd/04 Milk 1-131 pCi/L 55 58.2 0.95 Agreement E4186-162 2nd/04 Milk I-131 LL pCUL 59 58.2 1.01 Agreement E4186-162 2nd/04 Milk Ce-141 pCi/L 165 157 1.06 Agreement E4186-162 2nd/04 Milk Cr-51 pCUL 241 228 1.06 Agreement E4186-162 2nd/04 Milk Cs-134 pCiUL 99 101 0.98 Agreement E4186-162 2nd/04 Milk Cs-137 pCi/L 157 156 1.01 Agreement E4186-162 2nd/04 Milk Co-58 pCi/L 46 46.2 1.00 Agreement E4186-162 2nd/04 Milk Mn-54 pCUL 73 70.5 1.04 Agreement E4186-162 2nd/04 Milk Fe-59 pCi/L 48 44.5 1.08 Agreement E4186-162 2nd/04 Milk Zn-65 pCVL 100 99.3 1.01 Agreement E4186-162 2nd/04 Milk Co-60 pCi/L 175 172 1.02 Agreement MAPEP RdF12 May-04 Filter Sr-90 pCi 20.3 22.4 0.91 Agreement (2)

(1) - Problems encountered in filter dissolution, filter re-ordered.

(2) - Replacement filter for first half 2004 from DOE MAPEP C-4

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 FRAMATOME ANP ENVIRONMENTAL LABORATORY ANALYTICS RADIOLOGICAL ENVIRONMENTAL CROSS-CHECK PERFORMANCE EVALUATION Ratio Sample Quarter/ Sample Reported Known E-LABI Number Year Media Nuclide Units Value Value Analytics Evaluation E4269-162 3rd/2004 Water Gross Alpha pCVL 41.3 42.7 0.97 Agreement E4269-162 3rd/2004 Water Gross Beta pCi/L 214 225 0.95 Agreement E4270-162 3rd/2004 Water 1-131 LL pCiVL 67.8 70.8 0.96 Agreement E4270-162 3rd/2004 Water 1-131 pCiL 70.5 70.8 1.00 Agreement E4270-162 3rd/2004 Water Ce-1 41 pCi/L 258 250 1.03 Agreement E4270-162 3rd/2004 Water Cr-51 pCi/L. 230 223 1.03 Agreement E4270-162 3rd/2004 Water Cs-134 pCi/L 93.4 96.4 0.97 Agreement E4270-162 3rd/2004 Water Cs-137 pCi/L 217 215 1.01 Agreement E4270-162 3rd/2004 Water Co-58 pCVL 93.4 94.6 0.99 Agreement E4270-162 3rd/2004 Water Mn-54 pCi/L 181 181 1.00 Agreement E4270-162 3rd/2004 Water Fe-59 pCi/L 95.2 91.6 1.04 Agreement E4270-162 3rd/2004 Water Zn-65 pCi/L 180 178 1.01 Agreement E4270-162 3rd/2004 Water Co-60 pCi/L 126 125 1.01 Agreement E4271-162 3rd/2004 Filter Gross Alpha pCi 38.3 36.8 1.04 Agreement E4271-162 3rd/2004 Filter Gross Beta pCi 191 194 0.98 Agreement E4272-162 3rd/2004 Milk 1-131 LL pCiUL 79.4 83.5 0.95 Agreement E4272-162 3rd/2004 Milk 1-131 pCi/L 81.1 83.5 0.97 Agreement E4272-162 3rd/2004 Milk Ce-1 41 pCiUL 240 235 1.02 Agreement E4272-162 3rd/2004 Milk Cr-51 pCi/L 214 210 1.02 Agreement E4272-162 3rd/2004 Milk Cs-1 34 pCUL 89.5 90.6 0.99 Agreement E4272-162 3rd/2004 Milk Cs-137 pCUL 204 202 1.01 Agreement E4272-162 3rd/2004 Milk Co-58 pCi/L 90.9 89 1.02 Agreement E4272-162 3rd/2004 Milk Mn-54 pCi/L 173 171 1.01 Agreement E4272-162 3rd/2004 Milk Fe-59 pCiUL 91.3 86.1 1.06 Agreement E4272-162 3rd/2004 Milk Zn-65 pCi/L 169 167 1.01 Agreement E4272-162 3rd/2004 Milk Co-60 pCi/L 116 118 0.98 Agreement E4273-162 3rd/2004 Milk Sr-89 pCi/L 99.2 102 0.97 Agreement E4273-162 3rd/2004 Milk Sr-90 pCi/L 23.4 24.5 0.96 Agreement E4340-162 3rd/2004* Filter Sr-89 pCUiL 151 152 1.00 Agreement E4340-162 3rd/2004* Filter Sr-90 pCiUL 53.5 58.8 0.91 Agreement

  • - Replacement filter for lost 2nd quarter filter.

C-5

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 200-4 FRAMATOME ANP 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 Evaluation E4380-162 4th/2004 Water H-3 pCi/L 8327 8060 1.03 Agreement E4381-162 4th/2004 Filter Sr-89 pCi 87.7 92.3 0.95 Agreement E4381 -162 4tht2004 Filter Sr-90 pCi 8.78 10.6 0.83 Agreement E4382-162 4th/2004 Filter Gross Alpha pCi 24.9 29.5 0.84 Agreement E4382-162 4tht2004 Filter Gross Beta pCi 233 204 1.09 Agreement E4383-162 4tht2004 Filter Ce-1 41 pCi 75.6 80.3 0.94 Agreement E4383-162 4tht2004 Filter Cr-51 pCi 201 189 1.06 Agreement E4383-162 4tht2004 Filter Cs-1 34 pCi 82.4 84.7 0.97 Agreement E4383-162 4tht2004 Filter Cs-137 pCi 68.8 62.9 1.09 Agreement E4383-162 4tht2004 Filter Co-58 pCi 75.3 72.9 1.03 Agreement E4383-162 4thl2004 Filter Mn-54 pCi 76.3 67.7 1.13 Agreement E4383-162 4th/2004 Filter Fe-59 pCi 69.8 60.5 1.15 Agreement E4383-162 4thl2004 Filter Zn-65 pCi 109 97.7 1.12 Agreement E4383-162 4th/2004 Filter Co-60 pCi 85.1 87.1 0.98 Agreement E4384-162 4tht2004 Milk 1-131LL pCUL 64.2 66.7 0.96 Agreement E4384-162 4th/2004 Milk 1-131 pCU/L 69.0 66.7 1.03 Agreement E4384-162 4th/2004 Milk Ce-141 pCi/L 154 155 0.99 Agreement E4384-162 4th/2004 Milk Cr-51 pCi/L 385 379 1.02 Agreement E4384-162 4tht2004 Milk Cs-1 34 pCi/L 167 170 0.98 Agreement E4384-162 4th/2004 Milk Cs-137 pCi/L 132 126 1.05 Agreement E4384-162 4th/2004 Milk Co-58 pCi/L 147 146 1.01 Agreement E4384-162 4th/2004 Milk Mn-54 pCi/L 144 136 1.06 Agreement E4384-162 4tht2004 Milk Fe-59 pCi/L 129 121 1.07 Agreement E4384-162 4tht2004 Milk Zn-65 pCi/L 197 196 1.01 Agreement E4383-162 4tht2004 Milk Co-60 pCUL 177 175 1.01 Agreement E4412-162 4tht2004 Water Sr-89 pCiVL 90.9 98.1 0.93 Agreement E4412-162 4th/2004 Water Sr-90 pCiUL 9.33 11.3 0.83 Agreement C-6

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report Millstone Station 2004 APPENDIX D ERRATA FOR 2003 D-1

Dominion Nuclear Connecticut, Inc. Annual Radiological Environmental Operating Report 2003 Millstone Station TABLE 8 GOAT MILK (PCI/L)

COLLECTION LOCATION DATE R-40 SR-89 SR-90 CS-134 CS-137 BA-140 LA- 140

( / ) ( / ) (./-)

21 05/06/03 1685 94 -0.01 0.21 1.6 2.5 7.0 3.4 0.0 3.0 0.0 3.5 05/21/03 1650 120 0.17 0.34 -0.7 3.2 5.7 4.0 4.0 4.6 4.5 5.3 06/10/03 1930 100 0.03 0.21 -0.5 2.6 1.5 2.3 -3.9 3.1 -4.5 3.6 06/24/03 1610 180 3.1 5.7 0.00 0.98 -0.02 0.22 2.7 5.3 2.1 4.9 2.3 6.9 2.6 7.9 07/08/03 1690 120 -0.10 0.04 0.5 3.3 3.7 3.2 -1.7 4.0 -1.9 4.6 07/22/03 1321 86 0.46 0.50 1.3 2.5 2.7 2.4 -0.4 3.1 -0.5 3.6 08/06/03 1420 110 0.45 0.48 2.7 3.2 3.4 4.0 -2.6 3.5 -3.0 4.1 08/19/03 1730 65 0.45 0.55 1.7 1.8 3.9 2.0 -0.1 3.5 -0.2 4.0 09/10/03 2070 140 0.00 0.11 -1.2 3.8 4.6 4.4 -0.4 5.7 -0.4 6.5 09/23/03 1470 150 3.4 5.5 0.6 1.1 -0.10 0.04 3.3 4.0 11.4 5.8 -2.8 5.6 -3.2 6.4 22 04/23/03 1700 140 -0.04 0.16 -1.6 3.2 0.9 3.8 -0.5 4.8 -0.6 5.5 05/06/03 1536 88 0.22 0.30 0.3 2.3 5.1 3.6 -4.3 3.4 -5.0 3.9 05/21/03 1540 150 0.11 0.33 1.7 3.9 8.5 s.0 2.4 6.0 2.7 6.9 06/10/03 1351 87 -0.08 0.03 -1.2 2.5 14.0 3.5 0.4 3.3 0.4 3.8 06/24/03 1390 160 -8.2 5.7 9.2 1.2 0.14 0.35 0.0 3.7 17.3 6.4 0.0 6.2 0.0 7.1 07/08/03 1770 110 0.07 0.15 0.1 2.8 21.7 4.4 1.0 3.7 1.1 4.2 07/22/03 1530 110 0.09 0.28 -0.2 3.3 24.8 5.1 -0.6 4.5 -0.7 5.2 08/07/03 1128 89 0.03 0.18 1.3 2.8 20.3 4.4 3.8 4.2 4.3 4.9 08/19/03 1213 86 6 12 14.5 1.8 0.09 0.04 1.8 2.5 19.8 3.8 0.5 4.9 0.6 s.6 24C 05/22/03 1710 150 -0.08 0.03 1.5 3.6 5.5 3.9 .3.6 6.2 -4.1 7.1 06/11/03 1790 120 0.03 0.20 -1.7 3.3 7.3 4.1 -4.4 4.4 -5.1 5.1 06/25/03 1700 190 -7.9 5.0 -1.5 1.1 0.12 0.25 1.1 4.9 -2.s 4.7 2.2 6.8 2.5 7.8 07/08/03 1660 100 0.05 0.23 1.1 2.6 3.2 3.1 -2.6 3.5 -3.0 4.1 07/22/03 1752 96 -0.04 0.02 1.7 2.5 3.6 2.8 2.6 3.4 2.9 3.9 08/05/03 1840 120 0.36 0.45 1.0 3.0 2.7 3.3 -3.7 4.7 -4.3 5.4 08/19/03 1966 67 0.03 0.28 -0.1 1.7 3.9 1.9 -0.2 3.3 -0.2 3.8 09/09/03 2060 120 0.08 0.17 0.6 3.0 5.2 3.9 0.3 5.6 0.4 6.4 09/23/03 1900 180 2.2 5.3 1.4 1.1 0.03 0.24 -0.3 4.6 -2.6 4.4 -3.3 5.2 -3.8 5.9 10/09/03 2060 110 -11.0 11.0 2.8 1.0 -0.20 0.07 0.6 2.9 2.2 2.6 -1.2 5.2 -1.4 6.0 PASTURE GRASS, RAY OR FEED WAS SAMPLED AS A SUBSTITUTE FOR UNAVAILABLE GOAT MILK STRONTIUM ANALYSES ARE COMPOSITES OF ALL MILK SAMPLED FROM A GIVEN LOCATION DURING THE QUARTER 3-51

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