RA-05-025, Annual Radiological Environmental Operating Report

Annual Radiological Environmental Operating Report

ML051380077
Person / Time
Site:	Maine Yankee
Issue date:	05/09/2005
From:	Meisner M Maine Yankee Atomic Power Co
To:	Document Control Desk, NRC/FSME
References
MN-05-022, RA-05-025
Download: ML051380077 (160)

Text

Maine Yankee 321 OLD FERRY RD.

• WISCASSET, ME 04578-4922 May 9, 2005 MN-05-022 RA-05-025 UNITED STATES NUCLEAR REGULATORY COMMISSION Attention: Document Control Desk Washington, DC 20555

References:

(a) License No. DPR-36 (Docket No. 50-309)

Subject:

2004 Annual Radiological Environmental Operating Report Gentlemen:

Enclosed is the Annual Radiological Environmental Operating Report for 2004 submitted in accordance with Maine Yankee Quality Assurance Program, Appendix D,Section IV.A and the Maine Yankee Off-site Dose Calculation Manual (ODCM), Appendix C, Item 1 .

We trust we have completed submission requirements for this report. Should you have questions or comments, please contact John Niles, ISFSI Manager at 207-882-1300.

Mi~el8.Meisner V ident, Chief Nuclear Officer re Enclosure c: Dr. R. R. Bellamy, NRC Region I Mr. J. T. Buckley, NRC NMSS Project Manager, Decommissioning Mr. P. J. Dostie, State of Maine, Division of Health Engineering Mr. S. J. Collins, NRC Regional Administrator, Region I Mr. W. C. Toppan, Dir., Maine Division of Health Engineering A5bq

Maine Yankee RELIABLE ELECTRICITY FOR MAINE SINCE 197 2004 cdcummmirg~fcOv

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MAINE YANKEE ATOMIC POWER STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM January - December 2004 DOCKET NO. 50-309 LICENSE NO. DPR-36 MAINE YANKEE ATOMIC POWER COMPANY AREVA Doc. # 47-5062773-00

EXECUTIVE

SUMMARY

During 2004, as in all previous years of plant operation, the Radiological Environmental Monitoring Program, (REMP), was conducted to assess the levels of radiation or radioactivity in the Maine Yankee environment. Nearly 400 samples were collected (including TLD's) over the course of the year, with over 2500 radionuclide or exposure rate analyses being performed on them. For most of the year samples collected as part of this program include bi-weekly air particulate, estuary water, fish, mussels, clams, crabs, lobsters, and milk. In addition to these samples, the radiation levels in areas surrounding the plant were measured continuously with TLD's.

Low levels of radioactivity from naturally-occurring, fallout and plant emission sources were detected.

Many samples had measurable concentrations of K-40, Be-7, Th-232 or Radon daughter products.

These are the most common of the naturally-occurring radionuclides. Some milk samples contained fallout radioactivity from atmospheric nuclear weapons tests conducted primarily from the late 1950's through 1980. None of the samples indicated radioactivity resulting from emissions from Maine Yankee. Consequently, there was judged to be no offsite environmental or health impact from the activities performed in 2004 for the decommissioning of Maine Yankee.

Maine Yankee shutdown in December of 1996. In August 1997 the decision was made to permanently cease power operation. Since that time the plant has been in a decommissioning phase and in 2004 this process was nearing completion. Decommissioning is taking place in strict conformance with USNRC regulations. Oversight also continues from the State of Maine.

During 2003, Offsite Dose Calculation Manual (ODCM) change number 23 eliminated the outer ring TLD's except for Site I1, Mason Station. This TLD site was eliminated following the 2 nd quarter of 2004.

During 2004, there was one change made to the ODCM that affected several functions of the Radiological Environmental Monitoring Program. As part ofchange number 29 to the ODCM, the inner ring of offsite environmental TLD's which measured direct radiation exposure were removed from the REMP. In 2004, area monitoring on-site continued with over 46 TLD's (non-REMP) covering all major site boundary areas.

In the fourth quarter of 1999, TLDs were placed within about 340 meters of the Independent Spent Fuel Storage Installation (ISFSI) in each of the 16 major compass directions. This was done to establish a baseline measurement before the transfer of radioactive materials to the storage pad. The first storage canister was placed on the ISFSI in December, 2001, with the last canister transferred to the ISFSI in February, 2004. The ISFSI TLD's located adjacent to the plant's site boundary did not show any significant change in exposure rate in 2004 over the baseline measurements. The ISFSI TLDs will ii

remain in place monitoring the spent fuel storage area during its operating life.

Sediment sampling was also removed from the REMP requirement in 2004. Collection of milk samples had been reduced to quarterly in a previous ODCM change and change number 29 dropped milk sampling all together, although samples were collected twice during the year. Additionally, the vegetation sampling requirements were removed from the ODCM. Vegetation samples were only required when milk samples were not available iii

TABLE OF CONTENTS

1.0 INTRODUCTION

.I 2.0 NATURALLY OCCURRING AND MAN-MADE BACKGROUND RADIOACTIVITY. 2 2.1 NATURALLY OCCURRING BACKGROUND RADIOACTIVITY .2 2.2 MAN-MADE BACKGROUND RADIOACTIVITY. 3 3.0 GENERAL PLANT AND SITE INFORMATION .4 4.0 PROGRAM DESIGN. 5 4.1 MONITORING ZONES .6 4.2 PATHWAYS M ONITORED ................................................................................................................................... 6

4.3 DESCRIPTION

S OF MONITORING PROGRAMS. 7 4.3.1 Air Sampling (AP, AP Demo) .7 4.3.2 Estuary Water Sampling (WE). 7 4.3.3 Ground Water Sampling (WG). 7 4.3.4 Sediment Sampling (SE). 8 4.3.5 Marine Algae (AL)

Sampling .8 4.3.6 Milk Sampling (TM). 8 4.3.7 Fish (FH) and Invertebrate Sampling (CA, HA, MU). 8 4.3.8 Mixed Vegetation Sampling (TF). 9 4.3.9 TLD Monitoring (TL). 9 4.3.10 Special Monitoring.10 5.0 RADIOLOGICAL DATA

SUMMARY

TABLES .23 6.0 ANALYSIS OF ENVIRONMENTAL RESULTS .37 6.1 SAMPLING PROGRAM DEVAT ONS .37 6.2 COMPARISON OF ACHiEVED LLDS WITH REQUIREMENTS .37 6.3 COMPARISON OF RESULTS AGAINST REPORTING LEVELS .38 6.4 DATA ANALYSIS BY MEDIA TYPE .38 6.4.1 Airborne Pathways.38 6.4.2 Waterborne Pathways.40 6.4.3 Ingestion Pathways. 41 6.4.4 Direct RadiationPathway (TL) .42 7.0 QUALITY ASSURANCE PROGRAM .71 7.1 INTRALABORATORY QUALITY CONTROL PROGRAM .............................................. 71 7.2 THIRD PARTY CROSS CHECK PROGRAM .72 7.3 BND DUPLICATE PROGRAM .72 7.4 ENVIRONMENTAL TLD QUALITY ASSURANCE PROGRAM .72 8.0 LAND USE CENSUS.79

9.0 REFERENCES

.81 APPENDIX A: MY REMP

SUMMARY

OF 2004 DATA .. A-I iv

LIST OF TABLES Table Title Page 4.1 Radiological Environmental Monitoring Program ................................................. 11 4.2 Radiological Environmental Monitoring Locations (Non-TLD) in 2004 ...................... 13 4.3 Radiological Environmental Monitoring Locations (TLD) in 2004 .............................. 15 4.4 Environmental Lower Limit of Detection (LLD) Sensitivity Requirements .................. 17 4.5 Reporting Levels for Radioactivity Concentrations in Environmental Samples ............ 18 5.1 Radiological Environmental Program Summary ............................................................ 25 5.2 Environmental TLD Data Summary ................................... ............................ 34 5.3 2004 Environmental TLD Measurements ............................................................... 35 7.1 FANPEL Results in the Intralaboratory Process Control Program . . 74 7.2 FANPEL Results in the Analytics Inc. Cross Check Program .. 75 7.3 Summary of Blind Duplicate Samples..78 8.1 2004 Land Use Census Locations ............................................................... 80 v

LIST OF FIGURES Figure Title Page 4.1 Radiological Environmental Sampling Locations Within 1 Kilometer of Maine Yankee .................................... .......................... 19 4.2 Radiological Environmental Sampling Locations Outside 1 Kilometer of Maine Yankee .............................................................. 20 4.3 Direct Radiation Monitoring Locations Within 1 Kilometer of Maine Yankee ............................................................. 21 4.4 Direct Radiation Monitoring Locations Outside 1 Kilometer of Maine Yankee ......................................... ..................... 22 6.1 Gross-Beta Measurements on Air Particulate Filters (Quarterly Average Concentrations) ............................................................ 44 6.2 Gross-Beta Measurements on Air Particulate Filters (AP-1 I vs. AP-29 Control) .............................................................. 45 6.3 Gross-Beta Measurements on Air Particulate Filters (AP-13 vs. AP-29 Control) .............................................................. 46 6.4 Gross-Beta Measurements on Air Particulate Filters (AP-14 vs. AP-29 Control) .............................................................. 47 6.5 Gross-Beta Measurements on Air Particulate Filters (AP-16 vs. AP-29 Control) .48 6.6 H-3 in Estuary Water WE-I2/WE-14, Plant Outfall .49 6.7 Cesium-137 in Shoreline Sediment Station SE-16, Old Outfall Area .50 vi

LIST OF FIGURES (continued)

Figure Title Page 6.8 Cesium-137 in Shoreline Sediment Station SE-18, Foxbird Island . . 51 6.9 Cesium-137 in Milk, 2004 ............................................................... 52 6.10 Cesium-137 in Milk Annual Average Concentrations .............................................. ..... 53 6.11 Strontium-90 in Milk, 2004 Quarterly Composites ........................................................ 54 6.12 Strontium-90 in Milk Annual Average Concentrations .................................................. 55 6.13 Exposure Rate at Inner Ring, Outer Ring and Control TLDs . . 56 6.14 Exposure Rate at Inner Ring TLDs, TL 01 -04 .. 57 6.15 Exposure Rate at Inner Ring TLDs, TL 05-08 ................................ 58 6.16 Exposure Rate at Inner Ring TLDs,TL 09,10,12,13..59 6.17 Exposure Rate at Inner Ring TLDs, TL 14-16 .......... ........................................... 60 6.18 Exposure Rate at Inner Ring TLDs, TL 17-19 .......... ........................................... 61 6.19 Exposure Rate at Outer Ring TLDs, TL 1,20-22..62 6.20 Exposure Rate at Outer Ring TLDs, TL23-26 ........................................................ 63 vii

LIST OF FIGURES (continued)

Fure Title Page 6.21 Exposure Rate at Outer Ring TLDs, TL 27-30 ............................................................. 64 6.22 Exposure Rate at Outer Ring TLDs, TL 31 -35 ............................................................ 65 6.23 Exposure Rate at Control Ring TLDs, TL 36-38 .......................................................... 66 6.24 Exposure at TLDs TL-I-01 through TL-I-04 and Avg. of Control TLDs................ 67 6.25 Exposure at TLDs TL-I-05 through TL-I-08 and Avg. of Control TLDs ................ 68 6.26 Exposure at TLDs TL-I-09 through TL-I-1 2 and Avg. of Control TLDs................ 69 6.27 Exposure at TLDs TL-I-13 through TL-I-17 and Avg. of Control TLDs................ 70 viii

1.0 INTRODUCTION

This report summarizes the findings of the Radiological Environmental Monitoring Program (REMP) conducted by Maine Yankee Atomic Power Company in the vicinity of the Maine Yankee Nuclear Power Station in Wiscasset, Maine during the calendar year 2004. It is submitted annually in compliance with Appendix C, item 1 of the Offsite Dose Calculation Manual (ODCM). The remainder of this report is organized as follows:

Section 2: Provides an introduction to the background radioactivity and radiation that is detected in the Maine Yankee environs.

Section 3: Provides a brief description of the Maine Yankee site and its environs.

Section 4: Provides a description of the overall REMP design. Included is a summary of the ODCM requirements for REMP sampling, tables listing routine sampling and TLD monitoring locations with compass sectors and distances from the plant, and maps showing the location of each of the sampling and TLD monitoring locations. Tables listing Lower Limit of Detection requirements and Reporting Levels are also included.

Section 5: Consists of the summarized data as required by the ODCM, in the format specified by the NRC Branch Technical Position on Environmental Monitoring (Reference 1).

Also included are complete environmental TLD data. Included in this data is the exposure-rate monitoring results for the ISFSI area.

Section 6: Provides the results of the 2004 monitoring program. The performance of the program in meeting ODCM requirements is discussed, and the data acquired during the year is analyzed.

Section 7: Provides an overview of the Quality Assurance programs used at the Framatome ANP Environmental Laboratory (FANPEL). The results of the Laboratory participation in an Interlaboratory Comparison Program required by ODCM section 2.4 are also given.

Section 8: Summarizes the requirements and the results of the 2004 Land Use Census.

Section 9: References Appendix A: A history of radiological laboratory analyses of environmental media for 2004 1

2.0 NATURALLY OCCURRING AND MAN-MADE BACKGROUND RADIOACTIVITY Radiation or radioactivity potentially detected in the Maine Yankee environment can be grouped into three categories. The first is "naturally-occurring" radiation and radioactivity. The second is "man-made" radioactivity from sources other than the Maine Yankee plant. The third potential source of radioactivity is due to emissions from the Maine Yankee plant. For the purposes of the Maine Yankee REMP, the first two categories are classified as "background" radiation, and are the subject of discussion in this section of the report. The third category is the one that the REMP is designed to detect and evaluate.

2.1 Naturally Occurring Background Radioactivity Natural radiation and radioactivity in the environment, which provide the major source of human radiation exposure, may be subdivided into three separate categories: "primordial radioactivity,"

"cosmogenic radioactivity" and "cosmic radiation." "Primordial radioactivity" is made up of those radionuclides that were created with the universe and that have a sufficiently long half-life to be still present on the earth. Included in this category are the radionuclides that these elements have decayed into. A few of the more important radionuclides in this category are Uranium-238 (U-238), Thorium-232 (Th-232), Rubidium-87 (Rb-87), Potassium-40 (K-40), Radium-226 (Ra-226), and Radon-222 (Rn-222). Uranium-238 and Thorium-232 are readily detected in soil and rock, whether through direct field measurements or through laboratory analysis of samples. Radium-226 in the earth can find its way from the soil into ground water, and is often detectable there. Radon-222 is one of the components of natural background in air, and its daughter products are detectable on air sampling filters. Potassium-40 comprises about 0.01 percent of all natural potassium in the earth, and is consequently detectable in most biological substances, including the human body. There are many more primordial radionuclides found in the environment in addition to the major ones discussed above (Reference 2).

The second category of naturally-occurring radiation and radioactivity is "cosmogenic radioactivity."

This is produced through the nuclear interaction of high energy cosmic radiation with elements in the earth's atmosphere, and to a much lesser degree in the earth's crust. These radioactive elements are then incorporated into the entire geosphere and atmosphere, including the earth's soil, surface rock, biosphere, sediments, ocean floors, polar ice and atmosphere. The major radionuclides in this category are Carbon-14 (C-14), Hydrogen-3 (H-3 or Tritium), Sodium-22 (Na-22), and Beryllium-7 (Be-7).

Beryllium-7 is the one most readily detected, and is found on air sampling filters and occasionally in biological media (Reference 2).

The third category of naturally-occurring radiation and radioactivity is "cosmic radiation." This consists of high energy atomic or sub-atomic particles of extra-terrestrial origin and the secondary particles and radiation that are produced through their interaction in the earth's atmosphere. The primary radiation comes mostly from outside of our solar system, and to a lesser degree from the sun. We are protected 2

from most of this radiation by the earth's atmosphere, which absorbs the radiation. Consequently, one can see that with increasing elevation one would be exposed to more cosmic radiation as a direct result of a thinner layer of air for protection. This "direct radiation" is detected in the field with gamma spectroscopy equipment, high pressure ion chambers and thermoluminescent dosimeters (TLDs).

2.2 Man-Made Background Radioactivity The second source of "background" radioactivity in the Maine Yankee environment is from "man-made" sources not related to the power plant. The most recent contributor to this category was the fallout from the Chernobyl accident in April of 1986, which was detected in the Maine Yankee environment and other parts of the world. A much greater contributor to this category, however, has been fallout from atmospheric nuclear weapons tests. Tests were conducted from 1945 through 1980 by the United States, the Soviet Union, the United Kingdom, China and France, with the large majority of testing occurring during the periods 1954-1958 and 1961-1962. (A test ban treaty was signed in 1963 by the United States, Soviet Union and United Kingdom, but not by France and China.) Atmospheric testing was conducted by the People's Republic of China as recently as October 1980. Much of the fallout detected today is due to this explosion and the last large scale one, done in November of 1976 (Reference 3).

The radioactivity produced by these detonations was deposited worldwide. The amount of fallout deposited in any given area is dependent on many factors, such as the explosive yield of the device, the latitude and altitude of the detonation, the season in which it occurred, and the timing of subsequent rainfall which washes fallout from the troposphere (Reference 4). Most of this fallout has decayed into stable elements, but the residual radioactivity is still detectable at low levels in environmental samples worldwide. The two predominant radionuclides are Cesium-137 (Cs-137) and Strontium-90 (Sr-90).

They are found in soil and in vegetation, and since cows and goats graze large areas of vegetation, these radionuclides can also be detected in the milk.

Other potential "man-made" sources of environmental "background" radioactivity include other nuclear power plants, coal-fired power plants, national defense installations, hospitals, research laboratories and industry. These collectively are insignificant on a global scale when compared to the sources discussed above (natural and fallout).

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3.0 GENERAL PLANT AND SITE INFORMATION The Maine Yankee Nuclear Power Station is located in the town of Wiscasset, Lincoln County, Maine, approximately six miles northeast of Bath, Maine. The site vicinity is rural and lightly populated.

The plant site is located on Bailey Point, a peninsula bounded to the east by the Back River and to the west by a shallow inlet known as Bailey Cove, both of which are part of the Montsweag Bay-Sheepscot River Estuary. (See the maps in Figures 4.1 to 4.4) Bailey point is an elongated bedrock ridge with flat or gently rolling topography rising to an average elevation of about 25 feet above sea level (Reference 5).

The single 900 megawatt PWR (Pressurized Water Reactor) unit at Maine Yankee began commercial operation in 1972. The Radiological Environmental Monitoring Program (REMP) began pre-operational measurements in 1970, two years prior to commercial operation. The REMP has been in continuous operation since that date.

Maine Yankee shut down in December 1996. In August 1997 the decision was made to permanently cease power operation after 24 years of operation. The plant has since been in the process of decommissioning, which involves the disassembly and removal of the plant components and structures.

This process is taking place in strict conformance with USNRC regulations. Oversight also continues from the State of Maine.

The radiological environmental monitoring program for Maine Yankee continued to operate in some form during 2004.

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4.0 PROGRAM DESIGN The Radiological Environmental Monitoring Program (REMP) for the Maine Yankee Nuclear Power Station was designed with the following specific objectives in mind. These objectives will continue to be in force, to varying degrees, throughout decommissioning activities at the Maine Yankee site.

• To provide an early indication of the appearance or accumulation of any radioactive material in the environment caused by the decommissioning operations at the station and the storage of spent nuclear fuel.

• To provide assurance to regulatory agencies and the public that the station's environmental impact is known and within anticipated limits.

• To verify the adequacy and proper functioning of station effluent controls and monitoring systems.

• To provide standby monitoring capability for rapid assessment of risk to the general public in the event of unanticipated or accidental releases of radioactive material.

The program was initiated in 1970, approximately two years before the plant began commercial operation in 1972. It has been in operation continuously since that time, with improvements made periodically over those years.

Prior to January 1992, the requirements for the Radiological Environmental Monitoring Program (REMP) were stated in the Radiological Effluent Technical Specifications (RETS). In January 1992, the REMP specifications were removed from the RETS and placed in the Offsite Dose Calculation Manual (ODCM) pursuant to NRC Generic Letter 89-01 (Reference 6).

The REMP is a requirement of the ODCM. The detailed sampling requirements of the REMP are given in Table 2.3 of ODCM Section 2.4. This table is summarized in this report as Table 4.1.

The required sampling locations are identified in Section 5 of the ODCM. The locations actually monitored in 2004 are shown on Tables 4.2 and 4.3, as well as Figures 4.1 through 4.4 of this report.

The locations in these tables and figures consist of the required locations specified in the ODCM, as well as any regularly sampled locations. The environmental sampling and TLD locations were determined using a differential Global Positioning System (GPS), with a typical accuracy of less than 5 meters. The reference point chosen for direction and distance was the former plant Primary Vent Stack (PVS). The ISFSI TLD's were positioned at a distance from the concrete storage pad using the centerline of the pad as a reference point.

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4.1 Monitoring Zones The REMP is designed to allow comparison of levels of radioactivity in samples from the area possibly influenced by the plant to levels found in areas not influenced by the plant. The first area is called Zone 1, and its monitoring locations are called "indicators." The second area is called Zone 2, and its monitoring locations are called "controls." The distinction between the two zones, depending on the type of sample or sample pathway, is based on one or more of several factors, such as site meteorological history, meteorological dispersion calculations, relative direction from the plant, river flow, and distance. Analysis of survey data from the two zones aids in determining if there is a significant difference between the two areas. It can also help in differentiating between radioactivity or radiation due to plant releases and that due to other fluctuations in the environment, such as atmospheric nuclear weapons test fallout or seasonal variations in the natural background.

4.2 Pathways Monitored Four pathway categories are monitored by the REMP. They are the direct radiation, airborne, waterborne, and ingestion pathways. Each of these four categories is monitored by the collection of one or more sample media, which are listed below, and are described in more detail in this section:

Airborne Pathway

• Air Particulate Sampling

• Demolition Particulate Sampling Waterborne Pathways

• Estuary Water Sampling

• Shoreline Sediment Sampling Ingestion Pathways

• Milk Sampling

• Fish and Invertebrate Sampling Direct Radiation Pathway

• TLD Monitoring 6

4.3 Descriptions of Monitoring Programs 4.3.1 Air Sampling (AP, AP Demo)

Continuous air samplers were operated for about half of the year at five locations. The sampling pumps at these locations operate continuously at a flow rate of approximately one to two cubic feet per minute.

Airborne particulates are collected by passing air through a 47 mm glass-fiber filter. A dry-gas meter is incorporated in the sampling stream to measure the total amount of air sampled in a given interval. The entire air sampling system is housed in a weatherproof structure. The filters, which are collected on a biweekly basis, are held for at least 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> at the Framatome ANP Environmental Laboratory (FANPEL) before being analyzed for gross-beta radioactivity. The filters are composited by location at the laboratory for a quarterly gamma spectroscopy analysis. Continuous air sampling (AP) was terminated in July, 2004 according to change #29 of the ODCM. (Reference 8)

During 2004, demolition particulate air sampling was also conducted as part of the program. The purpose was to monitor airborne activity levels surrounding buildings that were being demolished as well as monitor within buildings which are no longer tied into existing ventilation systems, have large permanent openings to the environment and are subject to active demolition activities as part of the decommissioning process. The number and location of sampling points is dependent on activities performed. Collection frequency is at least once weekly, or as required by dust loading. All filters are analyzed for gross beta as described above and composited quarterly for gamma isotopic analysis.

Should any individual filter gross beta result exceed the annual average of the normal REMP control locations, that individual filter will be analyzed for gamma isotopic analysis.

4.3.2 Estuary Water Sampling (WE)

Weekly grab samples are collected from the boat dock on the Back River, near the plant discharge (in-plant systems monitor water prior to release to the Back River as required by the ODCM). In addition, a weekly grab sample is collected at the control location in the Kennebec River. All estuary water samples are preserved with HCO to prevent the plate out of radionuclides on the container walls. These weekly grab samples are composited for a monthly sample analysis at the Framatome-ANP Environmental Laboratory. Each monthly composite sample is analyzed for gamma-emitting radionuclides. These monthly samples are then composited by location at the FANPEL for a quarterly H-3 analysis.

4.3.3 Ground Water Sampling (WG)

Due to the hydraulic gradient at the Maine Yankee site, whereby the ground water flow is southward down the peninsula and toward the water on the east and west sides, ground water sampling is not required at the Maine Yankee site, pursuant to ODCM Table 2.3. Nevertheless, grab samples were previously collected quarterly from one on-site location and one control location and analyzed for 7

gamma-emitting radionuclides. These samples were eliminated in 2003 due to the home and well at the indicator station being abandoned. No ground water samples were taken in 2004.

4.3.4 Sediment Sampling (SE)

Sediment sampling was eliminated by ODCM change #29. No sediment samples were collected in 2004.

4.3.5 Marine Algae Sampling (AL)

Sampling of this media is not required by ODCM Table 2.3 and no samples were collected during the calendar year 2004.

4.3.6 Milk Sampling (TM)

Milk samples are collected on a regular schedule when available from two locations - one indicator and one control. The indicator location is chosen as a result of the annual Land Use Census, based on a hypothetical potential dose commitment. The second location is a control, which is located sufficiently far away from the plant to be outside any potential influence from it. In 2004 the milk sampling was conducted two times. ODCM change number 23, effective in the second quarter of 2003, modified the sampling frequency from monthly to quarterly. This was a result of the elimination of the requirement to monitor for short-lived radionuclides (e.g., iodine- 131 which has an eight day half-life). This ODCM change was based on an evaluation that showed there was no longer a credible source term of short-lived radionuclides for a release to the environment.

Samples of milk are chilled after collection and shipped to the FANPEL on ice. Methimazole and formaldehyde are added to the milk upon receipt at the Laboratory. Each sample is analyzed for gamma-emitting radionuclides. Although not required by the ODCM, Sr-89 and Sr-90 analyses are also performed on quarterly composited samples.

Milk sampling was eliminated following the second 2004 sample collection according to Change #29 of the MY ODCM.

4.3.7 Fish (FH) and Invertebrate Sampling (CA, HA, MU, and MA)

Samples of commercially important fish and invertebrates are collected two times seasonally at two locations (near the plant discharge and at a control location on the Sheepscot River). Maine Yankee Environmental Services staff collects samples of fish, crabs (CA), lobsters (HA) and Mollusks (blue mussels [MN] and soft shell clams [MA] ). Samples are separated by species and are then frozen and delivered to the FANPEL, where the edible portions are analyzed for gamma-emitting radionuclides.

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In 1995, the Town of Wiscasset re-opened several clam flats, including Bailey Cove that had been closed to clam digging for many years. During 2004, one seasonal sample of soft-shell clam (Mya arenaria)was collected from two locations in the vicinity of Bailey Cove. The clam samples were frozen and analyzed for gamma emitting radionuclides at the FANPEL. This sample is not required by the Maine Yankee ODCM.

4.3.8 Mixed Vegetation Sampling (TF)

There is no ODCM requirement for mixed vegetation sampling while milk sampling is being performed. No samples were collected in 2004 since milk collections were continued for as long as required by the ODCM. Change #29 to the ODCM discontinued milk sampling following collection of the June 2004 samples.

4.3.9 TLD Monitoring (TL)

Direct gamma radiation exposure was continuously monitored with the use of thermoluminescent dosimeters (TLDs). Specifically, Panasonic UD-801AS 1 and UD-814AS 1 calcium sulfate dosimeters were used, with a total of five elements in place at each monitoring location. Each set of dosimeters is sealed in a plastic bag, which is in turn housed in a plastic-screened container. This container is attached to an object such as a tree, fence or utility pole. The plant staff posts and retrieves all TLDs quarterly. All TLDs are processed at the FANPEL.

In addition to these environmental TLDs, TLDs were placed (starting the fourth quarter of 1999) on-site within about 340 meters of the Independent Spent Fuel Storage Installation (ISFSI) in each of the 16 major compass directions. The ISFSI is located approximately 450 meters NE of the containment dome. The ISFSI TLDs are classified as TL-I-# in Table 5.3.

Location TL-3 (former Bailey House) also serves as location TL-I-5 and TL-5 (location of former MY Information Center) serves as TL-I-10.

Although ODCM change #29 eliminates the requirement for inner ring environmental TLD's, several were continued for most or all of 2004 and are listed in table 4.3. In addition, non-REMP related area monitoring on-site also continued with over 46 TLD locations (not included in this data assessment) covering all major site boundary areas. This on-site area monitoring program provided operational information in support of plant decommissioning activities.

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4.3.10 Special Monitoring On occasion, special interest samples are taken that are not required as a part of the Radiological Environmental Monitoring Program (REMP). The sample locations vary from year to year and do not appear in Table 2.3 of the Offsite Dose Calculation Manual, nor do they appear in Table 4.1 or 4.2 of this report. The analysis results may be discussed in Section 5 of this report, as appropriate.

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I I I I I I I r I r I I TABLE 4.1 Radiological Environmental Surveillance Program (as required during 2004 by ODCM Table 2.3)

X Collection _ ________Anays Exposure Pathway and/or Number of Routine Analysis Analysis Sample Media Sample Locations Sampling Collection Type Frequency Mode Frequency I. Direct Radiation (TLDs) (1) Total Locations: 36 Continuous Quarterly Gamma dose Each TLD Following ODCM change #29 Total Locations: 19 Continuous Quarterly Gamma dose Each TLD

2. Airborne a) Routine Particulate(2) Total Locations: 5 Continuous Biweekly Particulate Sample: Each Sample Gross Beta Gamma Isotopic Quarterly Composite (by location)

Continuous Continuous Gross beta Each sample b) Demolition Particulate DependentT operations of sampler with sample Gamma Isotopic Quarterly Composite' collection as required by dust loading but at least once weekly.

3. Waterborne

a. Estuary Water Total Locations: 2 Weekly grab sample Monthly Gamma Isotopic Each Sample for a monthly Tritium (H-3) Quarterly Composite composite sample*

b. Shoreline Sediment (3) Total Locations: 2 NA NA NA NA oa in I

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... UMULUr MULaln, rucu Anait grao sarH^pIeS 5naul e A _ s Fow nd on y we iecuon or e is r e p o_ cn te collectio Dte coneUMM on tne ude cycle when the direction or niver nlow is troim mhe point ot discharge toward the collection point.

T The number and location of sampling points is dependent on the activities performed. Air samplers are placed in or within close proximity of buildings undergoing demolition activities to provide reasonable assessment of the airborne activity that may be generated.

IT Continuous operation during periods when a building is no longer tied into existing ventilation systems, has large permanent openings to the environment, and is subject to active demolition activities.

Analyze for gross beta at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following filter change.

Perform gamma isotopic analysis on any filter indicating activity greater than 5 times the yearly mean of the control samples (I) ODCM Change #29 eliminated all inner ring TLD's (except for controls) from the program, however, stations TL-01,TL-02,TL-08,TL-I0,TL-13 were continued through 4 'hQuarter (2) Continuous air samples were eliminated in July 2004 per ODCM Change #29.

(3) Sediment sampling was discontinued per ODCM Change #29.

11

r ( I (r I I r I r TABLE 4.1 (Continued)

Radiological Environmental Surveillance Program (as required during 2004 by ODCM Table 2.3)

_ Collection ___________Analysis Exposure Pathway and/or Nominal Number of Routine Nominal Analysis Analysis Sample Media Sample Locations Sampling Collection Type Frequency Mode Frequency

4. Ingestion

a. Milk* (4) Total Locations: 2 Grab Quarterly Gamma Isotopic Each sample

b. Fish and Invertebrates Total Locations: 2 Grab Semiannually Gamma Isotopic on edible Each sample (commercially or recreationally (or seasonal if portions important species) appropriate)

c. Food Products (3 types of broad- Total Locations: 3 Grab Quarterly when Gamma Isotopic Each sample leaf vegetation). Performed available only if milk sampling is not done. (4)

• Food Product may be substituted for milk samples (4) Milk sampling was performed until July 2004 when collections were discontinued per ODCM Change #29. Vegetation sampling was also removed from the ODCM by Change # 29. Vegetation samples were not required per the ODCM if milk was sampled.

12

TABLE 4.2 Radiological Environmental Monitoring Locations (non-TLD) in 2004 Maine Yankee Nuclear Power Station Distance Direction Station From Plant From Exposure Pathway Code Station Description Zone' (km) Plant

1. Airborne

a. Air Particulate (1) AP-1 I Montsweag Brook I 2.7 NW AP-13 Bailey Farm (ESL) 1 0.7 NE AP-14 Mason Steam Station 1 4.8 NNE AP-16 Westport Firehouse 1 1.8 S AP-29 Dresden Substation 2 20.1 N

b. Demolition AP Demo- N/A Various Various Particulateb xx

2. Waterborne

a. Surface Water WE-14 Boat Dock 1 0.5 NE WE-20 Kennebec River 2 9.5 WSW (Grab Sample)

3. Ingestion

a. Milk (2) TM-18 Chewonki Foundation 2 1.9 WSW TM-25 Hanson Farm 2 18.3 W 13

TABLE 4.2 (Continued)

Radiological Environmental Monitoring Locations (non-TLD) in 2004 Maine Yankee Nuclear Power Station Distance Direction Station From Plant From Exposure Pathway Code Station Descripion Zone' (km) Plant

4. Ingestion, continued FH-l Id Long Ledge Area 1 0.9 S

b. Fish & MU-1I Invertebrates CA-I I HA-Il FH-24 Sheepscot River 2 11.1 S MU-24 CA-24 HA-24

c. Clam c MA-16 Old Outfall Area 1 0.65 S MA-18 Foxbird Island 1 0.65 S

d. Food Crop N/A N/A N/A N/A N/A Vegetation' I = Indicator Stations; 2 = Control Stations b The number and location of Demolition sampling points is dependent on the activities performed. Air samplers are placed in or within close proximity of buildings undergoing demolition activities to provide reasonable assessment of the airborne activity may be generated C MA = Soft-Shell Clams (Mya arenaria). Not an ODCM requirement d FH = Fish, MU = Mussels, CA = Crabs, HA = Lobsters Food crop sampling is not required while milk sampling is being done. Food crop sampling eliminated per ODCM change #29.

(1) Continuous air sampling was eliminated in July 2004 per ODCM Change #29 (2) Milk sampling was eliminated per ODCM change #29. Sampling was discontinued following collection of the June 2004 samples.

14

TABLE 4.3 Radiological Environmental Monitoring Locations (TLD) in 2004 Maine Yankee Nuclear Power Station Distance From Plant Direction Station Code Station Description Zone* (km) From Plant TL-1 Old Ferry Rd. I 0.9 N TL-2 Old Ferry Rd. l 0.8 NNE TL-3** Bailey House (ESL) I 0.7 NE TL-4 Westport Island, Rt. 144 I 1.3 ENE TL-5** MY Information Center I 0.2 ENE TL-6 Rt. 144 & Greenleaf Rd. I 1.0 E TL-7 Westport Island, Rt. 144 I 0.9 ESE TL-8 MY Screenhouse I 0.2 ESE TL-9 Westport Island, Rt. 144 I 0.8 SE TL-10 Bailey Point I 0.3 SSE TL-1 1 Mason Station 0 4.8 NNE TL-12 Westport Firehouse I 1.7 S TL-13 Foxbird Island I 0.3 SSW TL-14 Eaton Farm I 0.7 SW TL-15 Eaton Farm I 0.8 WSW TL-16 Eaton Farm I 0.7 W TL-17 Eaton Farm Rd. I 0.6 WNW TL-18 Eaton Farm Rd. 1 0.8 NW TL-19 Eaton Farm Rd. I 0.9 NNW TL-36 Boothbay Harbor Fire Station 2 12.2 SSE TL-37 Bath Fire Station 2 10.7 WSW TL-38 Dresden Substation 2 20.1 N

• I = Inner ring TLD;O = Outer Ring TLD;2 = Control TLD

• • = TL-03 will become TL-I-05 at its present location, TL-05 will become TL-I-10 at its present location Note: Per ODCM Change #29 inner ring TLD's were eliminated as of July 2004, however stations TL-0 1, TL-02,TL-08,TL-l0,TL-13, were maintained through 4ihQuarter 2004 15

TABLE 4.3 (Continued)

Radiological Environmental Monitoring Locations (TLD) in 2004 AMaine Yankee Nuclear Power Station Direction From ISFSI TLDs: Centerline of ISFSI*

TL-I-O1 Spent Fuel Storage N TL-I-02 Spent Fuel Storage NNE TL-I-03 Spent Fuel Storage NE TL-I-04 Spent Fuel Storage ENE TL-I-05** Spent Fuel Storage E TL-I-06 Spent Fuel Storage ESE TL-I-07 Spent Fuel Storage SE TL-I-08 Spent Fuel Storage SSE TL-I-09 Spent Fuel Storage S TL-I-10** Spent Fuel Storage SSW TL-I-1 I Spent Fuel Storage SW TL-I-12 Spent Fuel Storage WSW TL-I-13 Spent Fuel Storage W TL-I-14 Spent Fuel Storage WNW TL-I-1 5 Spent Fuel Storage NW TL-I-16 Spent Fuel Storage NNW

• ISFSI TLD locations are on site within 340 meters of the spent fuel storage facility.

• • TL-I-05 was also used as inner ring TL-03 in the same location. TL-03 was eliminated after the 2nd quarter 2004 per ODCM change #29.

TL-I-10 was also used as inner ring TL-05 in the same location. TL-05 was eliminated after the 2nd Quarter 2004 per ODCM change #29.

16

t I I I I I t I I I TABLE 4.4 Environmental Lower Limit of Detection (LLD) Sensitivity Requirements

• Airborne Particulate Fish & Food Sediment Analysis Water or Gas Invertebrates Milk Products (pCi/kg

(pCi/) (pCi/m 3 ) (pCi/kg wet) (pCi/l) (pCi/kg/wet) dry)

Gross-Beta 4 0.01 H-3 2000

• Mn-54 15 130 Co-58,60 15 130 Zr-Nb-95 15 Cs-134 15 0.05 130 15 60 150 Cs-137 18 0.06 150 18 80 180 Ba-La-140 15 15

• If no drinking water pathway exists, a value of 3000 pCi/l may be used.

17

I t IC r iC I I r V ( rI I TABLE 4.5 Reporting Levels for Radioactivity Concentrations In Environmental Samples Airborne Particulates Fish &

Analysis Water or Gases Invertebrates Milk Food Products (pCiOA) (pCi/m 3) (pCi/kg wet) (pCiAI) (pCiA)

H-3 20,000 a Mn-54 1000 30,000 Co-58 1000 30,000 Co-60 300 10,000 Zr-Nb-95 400 b Cs-134 30 10 1000 60 1000 Cs-137 50 20 2000 70 2000 Ba-La-140b 200 300

'If no drinking water pathway exists, a value of 30,000 pCi/l may be used.

bParent only.

18

Figure 4.1 Environmental Radiological Sampling Locations (within 1 KM)

Note:

AP-13 was eliminated following the 2nd quarter 2004 per ODCM change #29 SE-16 and SE-18 were eliminated for 2004 per ODCM change #29 19

Figure 4.2 Environmental Radiological Sampling Locations (outside 1 KM)

Note:

TM-1 8 and TM-25 were eliminated following the 2nd quarter 2004 per ODCM change #29 AP-11, AP- 14, AP-1 6 and AP-29 were eliminated following the 2nd quarter 2004 per ODCM change #29 20

Flaure 4.3 Direct Radiation Monitoring Locations (within 1 KM)

Note:

Inner ring TLD's were eliminated per ODCM change #29. TL-1, TL-2, TL-8, TL-1 0, TL-1 3, were maintained Through December 2004.

TL-7, TL-9, TL-14, TL-15, TL-16, TL-17, TL-18, TL-19 were eliminated following the 2nd quarter per ODCM change #29.

TL-3 and TL-5 became TL-1-5 and TL-I-10 in the ISFSI monitoring program.

21

Figure 4.4 Direct Radiation Monitoring Locations (outside 1 KM)

Note:

TL-4, TL-1 1, and TL- 12 were eliminated following 2nd quarter 2004 per ODCM change #29.

TL-36, TL-37, and TL-38 are still maintained as controls.

22

5.0 RADIOLOGICAL DATA

SUMMARY

TABLES This section summarizes the analytical results of the environmental samples, which were collected during 2004. These results, shown in Table 5. 1, are presented in a format similar to that prescribed in the NRC's Radiological Assessment Branch Technical Position on Environmental Monitoring (Reference 1). The results are ordered by sample media type and then by radionuclide. The units for each media type are also given.

The left-most column contains the radionuclide of interest, the total number of analyses for that radionuclide in 2004, and the number of measurements which exceeded the Reporting Levels found in Table 2.5 of the ODCM. Measurements exceeding the Reporting Levels are classified as "Non-Routine" measurements. The second column lists the required Lower Limit of Detection (LLD) for those radionuclides that have detection capability requirements as specified in the ODCM Table 2.4. The absence of a value in this column indicates that no LLD is specified in the ODCM for that radionuclide in that media. The target LLD for any analysis is typically 30-40 percent of the most restrictive required LLD.

Occasionally, the required LLD is not met. This is usually due to malfunctions in sampling equipment, which results in low sample volume. Such cases, if any, are addressed in Section 6.2.

For each radionuclide and media type, the remaining three columns summarize the data for the following categories of monitoring locations: (1) the indicator or Zone 1 stations, which are within the range of influence of the plant and which could conceivably be affected by its operation; (2) the station within Zone 1 or Zone 2 which had the highest mean concentration during 2004 for that radionuclide; and (3) the control or Zone 2 stations, which are beyond the influence of the plant. Environmental TLD or direct radiation monitoring stations are grouped into either an Inner Ring, an Outer Ring, or Control category.

In each of these columns, for each radionuclide, the following statistical values are given:

• The mean value of all concentrations, including negative values and values considered "not detectable".

• The lowest and highest concentration.

• The number of detectable measurements divided by the total number of measurements. For example, (4/20) would indicate that 4 of the 20 samples collected in 2004, for that sample type and that radionuclide, contained detectable radioactivity.

23

A sample is considered to yield a "detectable measurement" when the concentration exceeds three times its associated standard deviation. The standard deviation on each measurement represents only the random uncertainty associated with the radioactive decay process (counting statistics), and not the propagation of all possible uncertainties in the analytical procedure.

The radionuclides reported in this section represent those that: 1) had an LLD requirement in Table 2.4 of the ODCM, or a Reporting Level listed in Table 2.5, or 2) had a positive measurement of radioactivity, whether it was naturally-occurring or man-made; or 3) were of specific interest for any other reason. The radionuclides routinely analyzed and reported by the FANPEL for a gamma spectroscopy analysis are: Ac-Th-228, Ag-108m, Ag-i 10m, Ba-140, Be-7, Ce-141, Ce-144, Co-57, Co-58, Co-60, Cr-51, Cs-134, Cs-137, Fe-59, I-131, K-40, La-140, Mn-54, Nb-95, Ru-103, Ru-106, Sb-124, Sb-125, Se-75, Zn-65 and Zr-

95. In no case did a radionuclide not shown in Table 5.1 appear as a "detectable measurement" during 2004.

Data from direct radiation measurements made by TLDs are provided in Table 5.2 in a format essentially the same as above. The complete listing of quarterly TLD data is provided in Table 5.3.

24

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power Station, Wlscasset, ME (January - December 2004)

MEDIUM: Demolition Air Particulates (AD) UNITS: oCVcubic meter Indicator Stations Station With Highest Mean Control Stations Radionuclides Mean Station Mean Mean (No. Analyses) Required Range Range Range (Non-Routine-) LLD (No. Detected-) (No. Detected--) (No. Detected-)

GR-B (188) 0.01 2.6Z -2 22 3.1Z -2 NO DATA (0) ( 3.8 - 139.0)3 -3 ( 1.7 - 5.0)E -2 (187/ 188) (10/ 10)

Be-7 (43) 5.13 -2 24 3.2Z -1 NO DATA (0) ( -1.4 - 3.2)3 -1 (0/ 43) (0/ 1)

K-40 (43) -2.03 -2 74 5.13 -2 NO DATA (0) (-4.1 - 1.1)3 -1 ( -9.0 - 111.0)E -3 (0/ 43) (0/ 2)

Mn-54 (43) -1.3Z -4 72 2.53 -3 NO DATA (0) (-8.0 - 5.3)E -3 ( 1.1 - 3.8)Z -3 (0/ 43) (0/ 2)

Co-58 (43) -4.3E -3 30 6.7Z -5 NO DATA (0) (-7.4 - 0.5)E -2 ( -2.5 - 2.1)z -3 (0/ 43) (0/ 3)

Co-60 (43) 6.2Z -3 24 2.43 -2 NO DATA (0) ( -4.2 - 174.9)E -3 (6/ 43) (0/ 1)

Cs-134 (43) 0.05 2.7E -4 74 1.9E -3 NO DATA (0) ( -5.5 - 4.6)E -3 ( -7.0 - 46.0)E -4 (0/ 43) (0/ 2)

Cs-137 (43) 0.06 6.23 -4 72 2.5E -3 NO DATA (0) ( -1.5 - 2.2)E -2 ( 2.6 - 47.0)3 -4 (2/ 43) (0/ 2)

Th-232 (43) -1.13 -4 74 1.43 -2 NO DATA (0) ( -1.8 - 3.0)E -2 ( -2.5 - 30.0)E -3 (0/ 43) (0/ 2)

Footnotes to Table 5.1:

• The radionuclides reported In this table are those that: 1) had an LLD requirement In ODCM Table 2.4, or a Reporting Level in ODCM Table 2.5, or 2) had a positive measurement of radioactivity whether It was naturally occuring or man-made; or 3) were of specific interest for any other reason.

• Non-Routine refers to those radionuclides that exceeded the Reporting Levels In ODCM Table 2.5.

• -- The fraction of sample analyses yielding detectable measurements (i.e. >3 standard deviations) Is shown in parentheses.

25

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power Station, Wiscasset, ME (January - December 2004)

MEDIUM: Air Particulates (AP) UNITS: oCVcubic meter Indicator Stations Station With Highest Mean Control Stations Radionuclides' Mean Station Mean Mean (No. Analyses) Required Range Range Range (Non-Routine-) LLD (No. Detected-') (No. Detected-^) (No. Detected-)

(75) 2.2Z -2 16 2.43 -2 1.9Z -2 GR-B 0.01

( 9.9 - 37.4)Z -3 ( 1.0 - 3.7)Z -2 ( 9.9 - 29.5)Z -3 (0) (15/ 15)

(60/ 60) (15/ 15)

(15) 1.5Z -1 1.S -1 Be-7 5.6Z -2

-2.6 - 2.1)3 -1 ( 6.7 - 30.0)3 -2 ( 6.7 - 30.0)3 -2 (0) (2/ 3)

(4/ 12) (2/ 3)

K-40 (15) -2.6Z -2 13 -1.63 -2 -3.5E -2

-9.7 - 1.4)3 -2 ( -3.9 - -0.1)e -2 ( -7.6 - 1.7)X -2 (0) (0/ 3)

(0/ 12) (0/ 3)

Mn-54 (15) 1.4E -3 11 5.6Z -3 1.5Z -4

-3.0 - 16.2)Z -3 ( 5.0 - 1620.0)3 -5 ( -7.0 - 6.0)3 -4 (0)

(o/ 12) (0/ 3) (0/ 3)

(15) 14 1.S -2 3.83 -3 Co-58 1.63 -3

-2.0 - 4.9)E -2 ( -1.8 - 49.0)E -3 ( 6.0 - 90.0)Z -4 (0) (0/ 3)

(0/ 12) (0/ 3)

(15) 14 2.4E -3 -4.63 -3 Co-CO 1.1Z -3

-2.5 - 6.0)Z -3 ( 5.0 - 590.0)X -5 ( -1.4 - O.O)Z -2 (0) (0/ 3)

(0/ 12) (0/ 3)

(15) 29 3.03 -3 3.0Z -3 Cs-134 0.05 1.43 -3

-1.4 - 7.6)Z -3 ( -5.9 - 93.0)E -4 -5.9 - 93.0)E -4 (0) (0/ 3)

(0/ 12) (0/ 3) 11 2.3Z -3 -3.6z -3 Cs-137 (15) 0.06 -4.73 -4

( -8.0 - 6.0)3 -3 ( -4.0 - 60.0)Z -4 -1.0 - 0.0)3 -2 (0) (O/ 3)

(0/ 12) (0/ 3)

Footnotes to Table 5.1:

• The radionuclides reported In this table are those that: 1) had an LLD requirement In ODCM Table 2.4, or a Reporting Level in of ODCM Table 2.5, or 2) had a positive measurement of radioactivity, whether It was naturally occuring or man-made; or 3) were specific interest for any other reason.

"Non-Routine refers to those radionuclides that exceeded the Reporting Levels In ODCM Table 2.5.

- The fraction of sample analyses yielding detectable measurements (i.e. >3 standard deviations) Is shown in parentheses.

26

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power Station, Wiscasset, ME (January - December 2004)

MEDIUM: Lobster and Crab (HA) and (CA) UNITS: PClkq Indicator Stations Station With Highest Mean Control Stations Mean Station Mean Mean Radionuclides (No. Analyses) Required Range Range Range LLD (No. Detected-) (No. Detected-^^) (No. Detected-)

(Non-Routine-)

(8) 2.7E1 11 2.7E 1 -3.0Z 0 Be-7

-3.4 - 14.0)E 1 (-3.4 - 14.0)1 1 -3.0 - 3.0)1 1 (0) (0/ 4)

(0/ 4) (0/ 4)

(8) 1.61 3 11 1.6E 3 1.61 3 K.40 1.3 - 1.7)1 3 (1.3 - 1.7)1 3 1.2 - 2.1)E 3 (0)

(4/ 4) (4/ 4) (4/ 4) 6.71 0 11 6.7Z 0 -3.3E 0 Mn-54 (8) 130

-5.4 - 19.0)E 0 I-5.4 - 19.0)1 0 -1.9 - 1.3)t 1 (0)

(0/ 4) (0/ 4) (0/ 4)

-9.OE 0 11 -9.0E 0 -1.7E1 Co-58 (8) 130

-1.5 - -0.5)Z1 (-1.5 - -O.5)Z 1 -3.2 - 0.2)1 1 (0) (0/ 4)

(0/ 4) (0/ 4)

-8.31 0 11 -8.31 0 -2.3Z 1 Fe-59 (8)

-6.6 - 3.9)1 1 (-6.6 - 3.9)Z 1 -2.8 - -1.3)1 1 (0) (0/ 4)

(0/ 4) (0/ 4) 5.8Z 0 11 5.8Z 0 -3.41 0 Co-60 (8) 130 1 (-1.6 - 1.8)E1 (-2.4 - 1.3)1 1 (0) -1.6 -1.8)Z (C/ 4) (0/ 4) (0/ 4) 6.01 0 11 6.0Z 0 -2.2Z1 Zn-65 (8)

-5.9 -8.8)E1 (-5.9 - 8.8)1 1 (-5.0 - -0.8)1 1 (0) (0/ 4)

(0/ 4) (0/ 4) 1.3E 0 11 1.3Z 0 -2.51 -2

- Cs-134 (8) 130

-3.0 -6.5)E 0 (-3.0 - 6.5)1 0 (-1.1 - 2.0)E 1 (0) (0/ 4)

(0/ 4) (0/ 4) 1.7E 0 24 3.01 0 3.0E 0 Cs-137 (8) 150

-1.3 -1.3)E 1 (-6.0 - 9.7)E 0 -6.0 - 9.7)2 0 (0) (0/ 4)

(0/ 4) (0/ 4)

Footnotes to Table 5.1:

a Reporting Level In

• The radionuclides reported In this table are those that: 1) had an LLD requirement In ODCM Table 2.4, or or 3) were of ODCM Table 2.5, or 2) had a positive measurement of radioactivity, whether it was naturaliy occuring or man-made; specific Interest for any other reason.

^Non-Roullne refers to those radionuclides that exceeded the Reporting Levels In ODCM Table 2.5.

In parentheses.

- The fraction of sample analyses yielding detectable measurements (i.e. >3 standard deviations) Is shown 27

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power Station, Wiscasset, ME (January - December 2004)

MEDIUM: Fish (FH) UNITS: PCi/kq Indicator Stations Station With Highest Mean Control Stations Radionuclides, Mean Station Mean Mean (No. Analyses) Required Range Range Range (Non-Routine-) LLD (No. Detected-) (No. Detected-) (No. Detected-)

Be-7 (4) -6.33 1 11 -6.3E I -9.33 1

(-1.5 - 0.3)E 2 (-1.5 - 0.3)Z 2 -1.6 - -0.3)3 2 (0)

(0/ 2) (0/ 2) (0/ 2)

K-40 (4) 3.2E 3 11 3.2Z 3 3.03 3

( 3.0 - 3.5)Z 3 ( 3.0 - 3.5)3 3 2.3 - 3.7)E 3 (0)

(2/ 2) (2/ 2) (2/ 2)

Mn-54 (4) 130 -3.53 0 11 -3.5Z 0 -3.8Z 0 (0) -4.0 - -3.0)Z 0 -4.0 -3.0)E 0 -4.4 - -3.1)E 0 (0/ 2) (0/ 2) 0/ 2)

Co-58 (4) 130 -1.11 0 11 -1.E1 0 -5.8E 0 (0) (-1.2 - -1.0)3 0 -1.2 -1.0)E 0 -2.2 - 1.0)E 1 (0/ 2) (0/ 2) (0/ 2)

Fe-59 (4) -2.93 1 24 1.2E 1 1.23 1

(-8.2 - 2.4)z 1 7.0 - 17.0)E 0 7.0 - 17.0)E 0 (0) (0/ 2)

(0/ 2) (0/ 2)

Co-S60 (4) 130 3.13 0 24 3.5Z 0 3.SE 0

( 1.3 - 5.0)E 0 -4.0 - 11.1)Z 0 -4.0 - 11.1)3 0 (0)

(0/ 2) (0/ 2) (0/ 2)

Zn-65 (4) 2.4Z 1 11 2.43 1 -3.4E 1

(-9.0 - 57.0)E 0 -9.0 - 57.0)E 0 (-5.7 - -1.O)E 1 (0) (0/ 2)

(0/ 2) (0/ 2)

Cs-134 (4) 130 3.63 0 11 3.BE 0 2.5Z 0 (0) ( 2.2 - 5.4)z 0 2.2 - 5.4)E 0 2.0 - 3.0)Z 0 (0/ 2) (0/ 2) (0/ 2)

(4) -2.6Z 0 24 1.OE 0 1.03 0 Cs-1137 150

(-5.6 - 0.4)E 0 -1.0 - 1.2)Z 1 -1.0 - 1.2)E 1 (0) (0/ 2)

(0/ 2) (0/ 2)

Footnotes to Table 5.1:

• The radionuclides reported in this table are those that 1)had an LLD requirement in ODCM Table 2.4, or a Reporting Level in ODCM Table 2.5, or 2) had a positive measurement of radioactivity, whether it was naturally occuring or man-made; or 3) were of specific Interest for any other reason.

-Non-Routine refers to those radionuclides that exceeded the Reporting Levels in ODCM Table 2.5.

-The fraction of sample analyses yielding detectable measurements (i.e. >3 standard deviations) Is shown in parentheses.

28

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power Station, Wiscasset, ME (January - December 2004)

MEDIUM: Soft Shell Clams (MA) UNiTS: oCi/kq Indicator Stations Station With Highest Mean Control Stations Radionuclides* Mean Station Mean Mean (No. Analyses) Required Range Range Range (Non-Routine^) LLD (No. Detected-*) (No. Detected*) (No. Detected*-)

Be-7 (2) -8.0E 1 6 -4.0Z 1 NO DATA (0) ( -1.2 - -0.4)Z 2 (0/ 2) (0/ 1)

K-40 (2) 1.5z 3 8 1.SZ 3 NO DATA (0) ( 1.5 - 1.S)Z 3 (2/ 2) (1/ 1)

Mn-54 (2) 130 1.51 0 a 3.0S 0 NO DATA (0) C 0.0 - 3.0)E 0 (0/ 2) (0/ 1)

Co-58 (2) 130 1.O 0 8 1.9Z 1 NO DATA (0) ( -1.7 - 1.9)E 1 (0/ 2) (0/ 1)

Fe-59 (2) 2.9E 1 8 3.9Z 1 NO DATA (0) ( 1.8 - 3.9)Z 1 (0/ 2) (0/ 1)

Co-60 (2) 130 6.0Z 0 6 1.7Z 1 NO DATA (0) ( -5.0 - 17.0)3 0 (0/ 2) (0/ 1)

Zn-65 (2) -2.51 1 8 -2.1E 1 NO DATA (0) ( -2.8 - -2.1)Z 1 (0/ 2) (0/ 1)

Cs-134 (2) 130 4.4Z 0 8 9.8E 0 NO DATA (0) C -1.0 - 9.8)Z 0 (0/ 2) (0/ 1)

Cs-137 (2) 150 1.8Z 0 6 7.01 0 NO DATA (0) ( -3.4 - 7.0)Z 0 (0/ 2) (0/ 1)

Footnotes to Table 5.1:

• The radionuclides reported inthis table are those that: 1)had an LLD requirement In ODCM Table 2A, or a Reporting Level In ODCM Table 2.5, or 2) had a positive measurement of radioactivity, whether It was naturally occuring or man-made; or 3) were of specific Interest for any other reason.

-Non-Routine refers to those radionuclides that exceeded the Reporting Levels in ODCM Table 2.5.

^^ The fraction of sample analyses yielding detectable measurements (i.e. >3 standard deviations) is shown In parentheses.

29

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power Station, Wiscasset, ME (January - December 2004)

MEDIUM: Mussel (MU) UNITS: oCI/kq Indicator Stations Station With Highest Mean Control Stations Radionuclides* Mean Station Mean Mean (No. Analyses) Required Range Range Range (Non-Routine") LLD (No. Detected'-) (No. Detected-) (No. Detected^-)

Be-7 (4) 4.6z 1 24 1.4E 2 1.4Z 2 (0) ( 3.9 - 5.2)E 1 ( -9.0 - 36.0)Z 1 ( -9.0 - 36.0)3 1 (0/ 2) (0/ 2) (0/ 2)

K-40 (4) 1.2Z 3 11 1.2E 3 9.9Z 2 (0) ( 1.2 - 1.2)Z 3 ( 1.2 - 1.2)3 3 ( 9.1 - 10.6)Z 2 (2/ 2) (2/ 2) (2/ 2)

Mn-54 (4) 130 1.4Z 0 11 1.43 0 -7.5Z 0

( -1.3 - 4.0)3 0 (-1.3 - 4.0)z 0 (-1.7 - 0.2)E 1 (0)

(0/ 2) (0/ 2) (0/ 2)

Co-58 (4) 130 -7.53 0 11 -7.5E 0 -1.4Z 1 (0) ( -2.6 - 1.1)E 1 (-2.6 - 1.1)Z 1 (-1.4 - -1.3)Z 1

- (0/ 2) (0/ 2) (0/ 2)

Fe-59 (4) -3.33 1 24 -7.5S 0 -7.53 0 (0) ( -4.3 - -2.3)E 1 ( -7.6 - 6.1)Z 1 ( -7.6 - 6.1)3 1 (0/ 2) (0/ 2) (0/ 2)

Co-60 (4) 130 1.2Z 1 11 1.23 1 -2.23 1

( -2.0 - 25.0)E 0 ( -2.0 - 25.0)E 0 ( -5.1 - 0.8)E 1 (0)

(0/ 2) (0/ 2) (0/ 2)

Zn-65 (4) 1.4Z 1 24 4.33 1 4.33 1

( -6.0 - 33.0)E 0 ( -2.8 - 11.3)3 1 ( -2.8 - 11.3)3 1 (0)

(0/ 2) (0/ 2) (0/ 2)

Cs-134 (4) 130 2.03 0 11 2.03 0 -4.0O 0 (0) ( -1.0 - 5.0)E 0 ( -1.0 - 5.0)Z 0 ( -1.6 - 0.8)3 1 (0/ 2) (0/ 2) (0/ 2)

Cs-137 (4) 150 5.03 -1 24 6.33 0 6.33 0

( 0.0 - 1.0)E 0 ( -2.4 - 15.0)3 0 ( -2.4 - 15.0)3 0 (0)

(0/ 2) (0/ 2) (0/ 2)

Footnotes to Table 5.1:

• The radionuclides reported In this table are those that: 1) had an LLD requirement In ODCM Table 2.4, or a Reporting Level in ODCM Table 2.5, or 2) had a positive measurement of radioactivity, whether It was naturally occuring or man-made; or 3) were of specific Interest for any other reason.

• -Non-Routine refers to those radionuclides that exceeded the Reporting Levels In ODCM Table 2.5.

"' The fraction of sample analyses yielding detectable measurements (i.e. >3 standard deviations) Is shown In parentheses.

30

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power Station, Wiscasset, ME (January- December 2004)

MEDIUM: Sediment (SE) UNITS: PClikq Indicator Stations Station With Highest Mean Control Stations Radionuclides Mean Station Mean Mean (No. Analyses) Required Range Range Range (Non-Routine*-) LLD (No. Detected-) -(No. Detected-')- (No. Detected-)

Sediment sampling was eliminated by ODCM change #29. No sediment samples were collected in 2004.

31

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power StatIon, Wiscasset, ME (January - December 2004)

MEDIUM: Milk (TM) UNITS: PCi/L Indicator Stations Station With Highest Mean Control Stations Radionuclides Mean Station Mean Mean (No. Analyses) Required Range Range Range (Non-Routine*") LLD (No. Detected***) (No. Detected-) (No. Detected,")

K-40 (4) 1.41 3 is 1.4E 3 1.4Z 3 (0) ( 1.4 - 1.5)1 3 ( 1.4 - 1.5)E 3 ( 1.4 - 1.4)E 3 (2/ 2) (2/ 2) (2/ 2)

Sr-es (4) -9.0E 0 25 1.51 0 1.5Z 0 (0) ( -1.7 - -0.1)Z 1 ( 1.0 - 28.0)X -1 ( 1.0 - 28.0)E -1 (0/ 2) (0/ 2) (0/ 2)

Sr-90 (4) 2.1E 0 is 2.1E 0 8.2E -1 (0) ( 2.1 - 2.1)E 0 ( 2.1 - 2.1)E 0 ( 8.0 - 8.4)1 -1 (2/ 2) (2/ 2) (0/ 2)

Cs-i34 (4) is 2.41 -1 25 6.5E -1 6.51 -1 (0) ( 1.8 - 3.0)E -1 ( 0.0 - 1.3)E 0 ( 0.0 - 1.3)E 0 (0/ 2) (0/ 2) (0/ 2)

Cs-137 (4) 18 2.41 0 18 2.43 0 2.01 0 (0) ( 6.5 - 42.0)E -1 ( 6.5 - 42.0)1 -1 ( 3.0 - 36.0)E -1 (1/ 2) (1/ 2) (0/ 2)

Ba-140 (4) 15 1.5E -1 18 1.5E -1 -2.81 0 (0) ( 0.0 - 3.0)z -1 ( 0.0 - 3.0)1 -1 ( -3.3 - -2.4)E 0 (0/ 2) (0/ 2) (0/ 2)

- Footnotes to Table 5.1:

• The radionuclides reported In this table are those that: 1) had an LLD requirement in ODCM Table 2.4, or a Reporting Level In ODCM Table 2.5, or 2) had a positive measurement of radioactivity, whether It was naturally occuring or man-made; or 3) were of specific Interest for any other reason.

• "Non-Routine refers to those radionuclides that exceeded the Reporting Levels In ODCM Table 2.5.

- The fraction of sample analyses yielding detectable measurements i.e. >3 standard deviations) Is shown In parentheses.

32

Table 5.1 Radiological Environmental Program Summary Maine Yankee Nuclear Power Station, Wiscasset, ME (January - December 2004)

MEDIUM: Estuary Water (WE) UNITS: oCUL Indicator Stations Station With Highest Mean Control Stations Radionuclides Mean Station Mean Mean (No. Analyses) Required Range Range Range (Non-Routine-) LLD (No. Detected-) (No. Detected-) (No. Detected-*)

-9.5Z 1 20 -6.8E 1 -6.83 1 H-3 (8) 3000 (0) -4.5 - 4.9)E 2 (-7.7 - 3.0)E 2 (-7.7 - 3.0)E 2 (0/ 4) (0/ 4) (0/ 4)

(24) 2.23 2 14 2.2E 2 4.2E 1 K-40 (0) ( 9.9 - 26.4)Z 1 (-1.3 - 10.7)Z 1

_- 9.9 - 26.4)E 1 (12/ 12) (12/ 12) (5/ 12)

Mn-54 (24) 15 1.7E -1 14 1.7E -1 -4.1Z -1

-6.5 - 13.0)Z -1 (-6.5 - 13.0)Z -1 (-1.9 - 0.3)Z 0 (0) (0/ 12) (0/ 12)

(0/ 12)

Co-Ss (24) 1S 6.3Z -2 14 6.3E -2 -1.3Z -1

(-1.4 - 2.2)E 0 ( -1.4 - 1.3)Z 0 (0) -1.4 - 2.2)Z 0 (0/ 12) (O/ 12) (0/ 12)

(24) 1.3E 0 14 1.33 0 3.83 -1 Fe-59

-4.5 - 10.4)E 0 (-4.5 - 10.4)E 0 -4.8 -6.7)Z 0 (0) (0/ 12) (0/ 12)

(O/ 12)

Co-60 (24) 15 1.23 -1 14 1.23 -1 -3.6Z -2

-9.0 - 18.0)E -1 (-9.0 - 18.0)Z -1 -1.7 -1.6)E 0 (0) (0/ 12)

(O/ 12) (O/ 12)

Zn-65 (24) -9.83 -1 14 -9.83 -1 -1.3Z 0

-6.9 - 4.0)3 0 (-6.9 - 4.0)E 0 -8.4 - 3.5)Z 0 (0) (0/ 12)

(0/ 12) (0/ 12)

Zr-95 (24) 15 7.8E -1 20 9.1Z -1 9.1Z -1

-1.4 -6.1)z 0 (-2.3 - 4.2)E 0 -2.3 - 4.2)3 0 (0) (0/ 12) (0/ 12)

(0/ 12)

(24) 6.83 -2 14 6.8E -2 -9.43 -2 Cs-134 15

-3.2 -1.2)3 0 (-3.2 - 1.2)E 0 -1.5 - 2.9)Z 0 (0) (0/ 12)

(O/ 12) (0/ 12)

Cs-137 (24) 18 4.83 -1 14 4.8E -1 -2.93 -1

-8.9 - 22.0)Z -1 (-8.9 - 22.0)E -1 -3.9 - 2.3)3 0

_ (0) (0/ 12)

(0/ 12) (0/ 12)

(24) 0 20 -6.53 0 -6.53 0 Ba-1i40 15 -9.63

-7.0 0.4)Z 1 (-4.9 - 0.5)Z 1 (-4.9 - 0.5)Z 1 (0) -

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

Footnotes to Table 5.1:

• The radionuclides reported in this table are those that: 1) had an LLD requirement in ODCM Table 2.4, or a Reporting Level in ODCM Table 2.5, or 2) had a positive measurement of radioactivity, whether It was naturally occuring or man-made; or 3) were of specific interest for any other reason.

-Non-Routine refers to those radionuclides that exceeded the Reporting Levels in ODCM Table 2.5.

- The fraction of sample analyses yielding detectable measurements (i.e. >3 standard deviations) is shown in parentheses.

33

TABLE 5.2 ENVIRONMENTAL TLD DATA

SUMMARY

MAINE YANKEE NUCLEAR POWER STATION, WISCASSET, ME (JANUARY - DECEMBER 2004)

(pR/hr)

INNER RING TLDs OUTER RING TLDs STATION WITH HIGHEST MEAN CONTROL TLDs MEAN +/- S.D. MEAN +/- S.D. MEAN +/- S.D. MEAN +/- S.D.

RANGE RANGE STA. RANGE RANGE (NO. MEASUREMENTS)* (NO. MEASUREMENTS)* NO. (NO. MEASUREMENTS)* (NO. MEASUREMENTS)*

7.5 +/- 1.3 8.3 +/- 1.7 37 9.6 +/- 1.3 7.9 +/- 1.7 5.5 - 10.4 7.1 - 9.6 8.7 - 11.6 6.1 - 11.6 36 2 4 12

• Each "measurement" is based on quarterly readings from five TLD elements.

NOTE: S.D. = standard deviation.

34

TABLE 5.3 2004 Environmental TLD Measurements (Micro-R per hour)

Annual Sta. I st Quarter 2nd Quarter 3rd Quarter 4th Quarter Ave.

No. Description Exp. S.D. Exp. S.D. Exp. S.D. Exp. S.D. Exp.

TL-01 Old Ferry Rd. 9.0

• 0.56 6.0 +/-L 0.49 6.0 +/- 0.3 7.5 +/- 0.3 7.1

+ 0.54 * +/-

• 8.3 TL-02 Old Ferry Rd. 10.4 +/- 0.44 7.1 7.3 +/- 0.3

• • *F TL-04 Westport Iss/Rt. 144 7.3 +/- 0.38 NA

• NA NA +/- NA 7.3

• • F NA +/- NA +/-

TL,06 Rt. 144/Greenleaf Rd. 9.4 +/- 0.4 6.5 + 0.46 NA +/- NA NA +/- NA 7.9 TL-07 Westport Isl./Rt. 144 8.9 +/- 0.57 5.6 t 0.3 NA i NA NA +/- NA 7.3 TL,08 MY Screenhouse 8.1 +/- 0.47 7.1 + 0.55 6.1 +/- 0.4 6.0 t 0.2 6.8 Th-09 Westport IslJRt. 144 8.1 +/- 0.5

• NA +/- NA NA +/- NA 8.1 TL-10 Bailey Point 8.3 +/- 0.51 6.7 +/- 0.3 6.9 + 0.3 7.3 TL-Il Mason Station 9.6 +/- 0.47 7.1 +/-.7 NA +/- NA NA +/- NA 8.3 TL- 12 Westport Firehouse 8.4 +/- 0.49 6.0 +/- 0.42 NA +/- NA NA +/- NA 7.2 TL,13 Foxbird Island 9.6 +/- 0.49 8.2 +/- 0.42 7.4 +/- 0.4 7.6 +/- 0.3 8.2 TL-14 Eaton Farm 7.5 +/- 0.47

• NA +/- NA NA +/- NA 7.5 TL-15 Eaton Farm 8.0 +/- 0.32 6.0 + 0.31 NA +/- NA NA +/- NA 7.0 TL-16 Eaton Farm 8.3 +/- 0.47 6.3 + 0.42 NA +/- NA NA +/- NA 7.3 TL-17 Eaton Farm Rd. 10.3 +/- 0.42 7.7 + 0.33 NA +/- NA NA +/- NA 9.0 TL- 18 Eaton Farm Rd. 8.9 +/- 0.45 6.3 + 0.45 NA +/- NA NA +/- NA 7.6 TL-19 Eaton Farm Rd. * +/-

• 5.5 +/- 0.46 NA +/- NA NA +/- NA 5.5 TL736 Boothbay Hbr.Fire Sta. 8.6 +/- 0.34 6.3 +/- 0.34 6.1 +/- 0.3 6.1 + 0.2 6.8 TL-37 Bath Fire Sta. 11.6 +/- 0.62 8.7 +/- 0.43 9.2 +/- 0.4 9.1 + 0.3 9.6 TL-38 Dresden Station 8.9 +/- 0.60 6.6 +/- 0.64 7.1

• 0.4 6.5 +/- 0.3 7.3 Note:

Exp. = Exposure Rate in MicroR/hr S.D. = Standard Deviation

• No data was available for this TLD. The TLD was not returned for analysis.

• • TL,03 and TL,05 are now TL-l-05 and TL-1-10 NA: TLD stations eliminated per ODCM change #29 35

TABLE 5.3 (continued) 2004 Environmental ISFSI TLD Measurements (Micro-R per hour)

Annual Sta. 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Ave.

Direction From No. Centerline of ISFSI Ex. S.D. Exp. S.D. Exo. S.D. Exp. S.D. Exp.

TL-I-01 N 7.0 t 0.27 8.4 +/- 0.37 6.2 +/- 0.3 6.7 +/- 0.4 7.1 TL[1-02 NNE 6.4 - 0.41 8.4 +/- 0.40 6.2 +/- 0.3 6.8 +/- 0.4 6.9 T1-03 NE 7.6 - 0.46 8.7 +/- 0.45 7.3 +/- 0.4 7.9 +/- 0.3 7.9 1TII-04 ENE 6.9 + 0.39 7.8 +/- 0.54 6.3 +/- 0.3 6.3 +/- 0.2 6.8 TL- 1-05 E 6.4 +/- 0.52 7.7 +/- 0.35 6.3 +/- 0.4 6.5 +/- 0.4 6.7 TL-I-06 ESE 9.6 + 0.47 11.2 +/- 0.86 9.7 +/- 0.6 9.6 +/- 0.6 10.0 TL-1-07 SE 7.0 +/- 0.33 8.4 +/- 0.47 6.7 +/- 0.4 6.8 +/- 0.3 7.2 TL-I-08 SSE 8.2 +/- 0.6 8.2 +/- 0.57 6.7 +/- 0.3 6.8 +/- 0.3 7.4 Th-I-09 S 7.4 + 0.38 9.5 +/- 0.63 8.9 +/- 0.7 8.8 +/- 0.4 8.7 TL-I-10 SSW 6.9 +/- 0.43 7.7 +/- 0.53 6.5 +/- 0.4 6.5 +/- 0.5 6.9 0.6 * +/-F

• 12.3 TL-l-1 1 SW 12.0 t 0.51 13.3 +/- 0.73 11.6 +/-

TL-1-12 WSW 7.7 +/- 0.75 10.4 +/- 0.57 7.6 +/- 0.4 7.1 +/- 0.4 8.2 TL-I-13 W 8.1 + 0.54 11.3 +/- 0.70 8.3 +/- 0.4 8.5 +/- 0.3 9.1 TL-1-14 WNW 7.4 +/- 0.40 9.8 +/- 0.64 7.8 +/- 0.4 7.8 +/- 0.5 8.2 TL-1-15 NW 8.3 +/- 0.40 10.3 +/- 0.53 8.0 +/- 0.4 8.6 +/- 0.3 8.8 TL-1-16 NNW 8.6 +/- 0.49 10.3 +/- 0.57 8.4 +/- 0.6 8.8 +/-t 0.4 9.0

• No data was available for this TLD. The TLD was not returned for analysis.

36

6.0 ANALYSIS OF ENVIRONMENTAL RESULTS 6.1 Sampling Program Deviations Table 2.3 of the Offsite Dose Calculation Manual (ODCM) allows for deviations in the REMP sampling schedule "if specimens are unobtainable due to hazardous conditions, to seasonal unavailability or to malfunction of sampling equipment." Such deviations do not compromise the program's effectiveness and in fact are considered insignificant with respect to what is normally anticipated for any radiological environmental monitoring program. The deviations for 2004 are as follows:

• For air particulate sample period 02/04/04 to 02/18/04, the Mason Station (AP-14) air sample pump was found inoperable at the time of filter change out. As determined by the flow totalizer, the pump ran for approximately 8 days. The sample was forwarded to the analysis laboratory for analysis with the estimated run time on the filter and the pump was replaced.

• Data from the Environmental TLD's stationed in the field for I" quarter 2004 indicate that TL-19 was lost in the field and not returned for analysis.

• Data from the Environmental TLD inner ring indicates that for the 2 Id quarter of 2004, four TLD's (TL-04, TL-09, TL-10, TL-14) were lost in the field and not returned for analysis.

6.2 Comparison of Achieved LLDs with Requirements Table 2.4 of the ODCM gives the required Lower Limits of Detection (LLDs) for environmental sample analyses. (This table is duplicated in Table 4.4 of this report.) Occasionally an LLD is not achievable due to a situation such as a low sample volume caused by sampling equipment malfunction. In such a case, ODCM Appendix C, Section 1requires a discussion of the situation.

At the FANPEL, the target LLD for any analysis is typically 30-40 percent of the most restrictive required LLD. Expressed differently, the typical sensitivities achieved for each analysis are at least 2.5 to 3 times greater than that required by the Maine Yankee ODCM.

For each analysis having an LLD requirement in ODCM Table 2.4, the a posteriori(after the fact)

LLD, or Minimum Detectable Concentration (MDC) calculated for that analysis was compared with the required LLD. During 2004, over 600 analyses had an LLD requirement listed in Table 2.4. There were sixteen instances where the sample analysis failed to meet the required LLD. Ten instances occurred with gross beta analyses for Demolition Particulate Samples due to relatively 37

low air volumes collected (small sample size) during the sampling times associated demolition activities. Six other instances of missed detection sensitivity occurred with Surface Water (Estuary) samples (three sets of two sample locations) where the analysis for Ba-140 (gamma isotopic analysis) was not achieved due to long decay time (half life for Ba- 140 equals 12.75 days) from sample collection to sample receipt at the analysis laboratory. Appendix A lists the results of all environmental sample analyses for 2004. Each of the occurrences of an analysis not meeting its specific required detection sensitivity is marked in the right hand column with a (+) and the actual MDC achieved for each analysis. For Ba-140, the ODCM indicates that the LLD in water samples is 15 pCi/kg. Due to the number of years since Maine Yankee permanently shutdown, it is not credible that any plant related Ba-140 could still remain.

6.3 Comparison of Results against Reporting Levels Section 2.4.3.3 of the ODCM requires the notification of the NRC (via the Annual Radioactive Effluent Release Report) whenever a Reporting Level in ODCM Table 2.5 is exceeded. Reporting Levels are the environmental concentrations that relate to the ALARA design dose objectives of 10 CFR 50, Appendix I. It should be noted that environmental concentrations are averaged over calendar quarters for the purposes of this comparison, and that Reporting Levels apply only to measured levels of radioactivity due to plant effluents. During 2004, no Reporting Levels were exceeded.

6.4 Data Analysis by Media Type The 2004 REMP data for each media type is discussed below. Whenever a specific measurement result is presented, it is given as the concentration plus or minus one standard deviation. This standard deviation represents only the random uncertainty associated with the radioactive decay process (counting statistics), and not the propagation of all possible uncertainties in the analytical procedure. A sample is considered to yield a "detectable measurement" when the concentration exceeds three times its associated standard deviation. With respect to data plots, it should be noted that all values for a given graph are plotted, whether or not they are considered statistically significant (detectable).

6.4.1 Airborne Pathways 6.4.1.1 Routine Air Particulates (AP)

The air particulate filters from each of the five off site sampling sites were analyzed bi-weekly for gross-beta radioactivity and are designated GR-B in Table 5.1. At the end of each quarter, the 38

filters from each sampling site were composited for a gamma analysis. This part of the REMP was terminated following the 2 quarter, 2004 per ODCM change #29 (Reference 8). The last samples were analyzed for GR-B on July 20, 2004. The results of the air particulate sampling program are provided in Table 5.1 and are plotted in Figure 6.1 through Figure 6.5. As shown in Figure 6.1, there has been no significant difference between the quarterly average concentration at the indicator (near-plant) stations and the control (distant from plant) stations.

Figures 6.2 through 6.5 show the gross beta concentration at each air particulate sampling location alongside th; control sampling location at AP-29 (Dresden Substation) for the same period. It can be readily seen that the gross-beta measurements on air particulate filters fluctuate significantly over the course of a year. The measurements from control station AP-29 vary similarly, indicating that these fluctuations are due to regional changes in naturally-occurring airborne radioactive materials, and not due to Maine Yankee activities. Table 5.1 shows that the mean gross beta concentrations from indicator stations are similar to those from control locations, further supporting this conclusion. The only gamma emitting radionuclide detected on air particulate filters was Be-7, a naturally-occurring cosmogenic radionuclide.

6.4.1.2 Demolition Air Particulates (AP Demo)

As required by ODCM Table 2.3 (Table 4.1 of this report), when a building is undergoing demolition activities, a continuous particulate air sample is collected weekly onsite in the vicinity of the work and analyzed for gross beta radioactivity. This information is considered a supplement to the standard off- site monitoring program and provides information on plant airborne effluents associated with demolition of plant structures due to their close proximity to any potential sources. At a minimum, a composite of the filters from each location collected during the quarter is then analyzed for gamma isotopic radioactivity. In addition, individual filters are required to be analyzed for gamma constituents if gross beta activity is greater than five times the yearly mean of the control station samples. In 2004, a total of ten locations were monitored and the results of the sampling program are provided in Table 5.1. The data is presented in the same format as for the routine REMP air samples discussed above. The mean gross beta concentration from the ten locations is similar to the REMP control location. In 2004 two sites indicated positive gamma isotopic radioactivity results for particular isotopes. Site number 22 indicated positive for Co-60 once. Three different samples for Site number 36 indicated positive for a single nuclide, Co-60. Two other samples from Site 36 indicated positive for both Co-60 and Cs-137. The positive indications for Cs-137 were well below the Reporting Levels found in Table 4.5 under Airborne Particulates or Gases (Co-60 does not have a specific reporting level listed in Table 4.5 for Airborne Particulates or Gases). The detected levels for both Co-60 and Cs- 137 39

were within an order of magnitude of the detection sensitivity of the counting system demonstrating that the airborne concentration levels were low when detected.

6.4.1.3 Mixed Grasses Monitoring of mixed grasses is not required by the Maine Yankee ODCM while milk sampling is routinely conducted. Milk sampling was conducted through the second quarter, 2004, after which both milk sampling and vegetation sampling requirements were removed per ODCM change #29 (Reference 8).

6A.2 Waterborne Pathways 6.4.2.1 Estuary Water (WE)

Grab samples of estuary water were collected weekly at the boat dock, (WE-14), in the Back River near the plant discharge. These samples were composited monthly and sent to the FANPEL for analysis. Grab samples were also collected at the control location (WE-20). Table 5.1 shows that naturally-occurring K-40 was detected in samples collected at both WE-14 and WE-20. This is typical at these two locations. The monthly samples were again composited by FANPEL each quarter, by station, for tritium (H-3) analyses. Table 5.1 shows that neither the WE- 14 nor the control location samples contained detectable tritium. Figure 6.6 provides a historical trend plot for quarterly composite H-3 concentrations at WE-12 and WE-14. All concentrations are plotted regardless of whether they are considered "detectable" or "not detectable". Those concentrations determined to be positive as defined in Section 5 are indicated with a solid black symbol. A plot for WE-20 is also indicated. As shown in Figure 6.6, no detectable tritium in estuary waters was found during 2004. For previous years, all detectable tritium concentrations were well below the Reporting Level for tritium in non-drinking water of 30,000 pCi/L.

6.4.2.2 Ground Water (WG)

Due to the hydraulic gradient at the Maine Yankee site, whereby the ground water flow is southward down the peninsula and toward the water on the east and west sides, ground water sampling is not required at the Maine Yankee site, pursuant to ODCM Table 2.3. Nevertheless, grab samples were previously collected quarterly from one on-site location and one control location and analyzed for gamma-emitting radionuclides. These samples were eliminated in 2003 due to the home and well at the indicator station being abandoned.

40

6.4.2.3 Shoreline Sediment (SE)

The sediment sampling requirement was eliminated from the REMP program per ODCM change #29 (Reference 8). No sediment samples were taken in 2004.

From past years historical sample analyses have characterized sediment near the plant site. The Cs-137 levels in past sediment core sections are plotted in Figures 6.7 and 6.8. These graphs show a range of Cs- 137 concentrations across core sections. The two figures show that the levels had not changed significantly over the past several years when sediment sampling was performed.

6.4.2.4 Marine Algae (AL)

Sampling of this media is not required by ODCM Table 2.3 and no samples were collected during the calendar year and 2004.

6.4.3 Ingestion Pathways 6.4.3.1 Milk (TM)

Milk samples were collected at one indicator and one control location for the first two quarters in 2004. Each sample collected was analyzed for gamma-emitting radionuclides. Although not an ODCM requirement, the samples were composited for each quarter by location and analyzed for Sr-89 and Sr-90.

Figures 6.9 and 6.10 shows the Cs- 137 concentration in cow milk for 2004 and a historical trend, respectively. There was "detectable" Cs- 137 identified in the indicator Site 18 sample for both quarters but there were no positive numbers for the control milk samples for 2004. The annual average Cs-137 concentration in the cow milk is similar to previous years. All Cs-137 concentrations, whether considered "detectable" or "non-detectable", are plotted in Figure 6.9.

Sr-90 activity was detected in the first two quarters in 2004 at indicator site 18. Figure 6.11 and 6.12 show the Sr-90 concentrations in quarterly composited cow milk for 2004 and a historical trend, respectively. The amount of strontium in milk is a function of many dietary factors, primarily calcium concentration and the degree of mineral exchange in the bones, and may be observed in the milk once an uptake has occurred. Neither the cesium nor strontium in the milk is 41

attributable to plant activities but rather is due to residual weapons fallout concentrations of Cs-137 and Sr-90.

6.4.3.2 Fish (FH) & Invertebrates (CA, HA, MU)

Semiannual samples of fish (FH) and invertebrates (lobster (HA), rock crab (CA) and blue mussel (MU)) were collected from locations -11 and -24 during 2004. The media code for the combined category of lobster and rock crab has been designated as CR in Table 5.1. Soft-shell clams (Mya arenaria- MA) were collected from two locations, designated 6 and 8, within Bailey Cove. The edible portions of each of this biota were analyzed for gamma-emitting radionuclides. As expected in biological matter, naturally occurring K-40 was detected in all 18 fish and invertebrate samples. No plant related radionuclides were detected.

6.4.4 Direct Radiation Pathway (TL)

The TLD's are collected on a calendar quarter basis for readout. Prior to the mid-year change in the TLD program, direct radiation was continuously measured at 19 locations surrounding the Maine Yankee plant. In 2004, ODCM change #29 eliminated all off-site Inner Ring locations, but left three off site controls at locations TL-36, 37 and 38. The need for these off site TLD locations was eliminated with the removal of potential airborne effluents and transfer of spent fuel to dry storage. In 2000, new TLD locations surrounding the Independent Spent Fuel Storage Installation (ISFSI) were added to the site measurement program to collect base line data near the ISFSI before the transfer of radioactive materials to the facility. Figures 6.24 through 6.27 indicate exposure trends prior to, during and following placement of spent fuel and waste material canisters on the storage pad.

As can be seen in Figures 6.13 to 6.27, there is a distinct annual cycle at both indicator and control locations. The lowest point of the cycle occurs during the winter months. This is due primarily to the attenuating effect of the snow cover on radon emissions and on direct irradiation by naturally-occurring radionuclides in the soil. Differing amounts of these naturally-occurring radionuclides in the underlying soil, rock or nearby building materials result in different radiation levels between one field site and another. It can be seen from Figure 6.23 that the Control TLD at the Bath Fire Station (TL-37) has historically given slightly elevated readings. This is apparently due to the natural radioactivity in the brick building.

42

The use of the off site Outer Ring environmental TLDs was eliminated in 2003. A single Outer Ring location, TL-I 1, remained in place until the end of the second quarter of 2004 when it was removed from the program. Quarterly readings from TL- I 1 are presented in Figure 6.13 and 6.19.

The use of all Inner Ring of TLDs was eliminated from the REMP half way through 2004. From Tables 5.2 and 5.3, as well as from Figure 6.13, it can be seen that the off site TLD mean exposure rates were not substantially different in 2004 between the control locations and the Inner and Outer Ring indicator sites.

Figures 6.24 through 6.27 illustrate the exposure rate history for the on-site environmental TLD's located within 1,100 feet surrounding the ISFSI in each of the sixteen major compass directions.

The data record begins before any radioactive material was placed in the facility, through the fourteen month transfer period of storage canisters to the ISFSI, and following completion of all transfers in early 2004. Most of the TLD locations indicate little or no significant change in exposure rate from the pre-operational period to the current period in 2004. However, two locations, TL-I-6 and TL-I-1 1 do appear to reflect a slight increase from the pre-operational conditions. TL-I-6 is in the ESE direction (roughly 500 feet from the pad) which borders a water boundary, the Back River. TL-I- 11 is located in the center of the Maine Yankee property, approximately 370 feet SW of the center of ISFSI pad. Neither of these locations is near a plant property line which could be occupied by members of the public. The closest on-site TLD locations to the plant property line are TL-I-3 and TL-I-4, each about 1000 feet away from the ISFSI in the NE and ENE sectors, respectively. Neither of these locations show any change in exposure rate from the pre-operational period through to the full ISFSI configuration in 2004.

43

FIGURE 6.1 GROSS-BETA MEASUREMENTS ON AIR PARTICULATE FILTERS QUARTERLY AVERAGE CONCENTRATIONS 0.12 0.12 0.08 -

.. 0.08 G

-0 0

0.04 -

0.04 0

0 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005

- Indicator Stations l -- x-- Control Stations 44

@70?

FIGURE 6.2 GROSS-BETA MEASUREMENTS ON AIR PARTICULATE FILTERS 0.10 0.08 0.06 U .0 0.02 0.00 . . . . . .

Jan Feb Apr May Jul Sep Oct Dec 2004 AP-I I Montsweag Brook O AP-29 Dresden Substation (control) 45

FIGURE 6.3 GROSS-BETA MEASUREMENTS ON AIR PARTICULATE FILTERS 0.10 0.08 -

0 v 0.06 P

-o U

0.02 0.00 l l l l l llI ll l . . . . l . . . . . l .

Jan Feb Apr May Jul Sep Oct Dec 2004

• AP-23 Bailey Farmhouse U AP-29 Dresden Substation (control) 46

FIGURE 6.4 GROSS-BETA MEASUREMENTS ON AIR PARTICULATE FILTERS 0.10 0.08 -

0.06-

._c I

M U 0.04 0.02 -

nnn V.Vu Jan Feb Apr May Jul Sep Oct Dec 2004 A AP- 14 Mason Steam Station

--X- AP-29 Dresden Substation (control) 47

FIGURE 6.5 GROSS-BETA MEASUREMENTS ON AIR PARTICULATE FILTERS In I A 0.08 -

0 E 0.06 -

0.04 -

U 0.02 -

0.00 I _

Jan Feb Apr May Jul Sep Oct Dec 2004

+ AP-16 Westport Farmhouse

_ AP-29 Dresden Substation (control) 48 C-a

FIGURE 6.6 H-3 IN ESTUARY WATER 2900 2900 2500 l 2500 2100 l 2100 1700 1700 1300 1300 900 900 500 IIRI0 100 0

-300

-300

-700 -700 1989 1991 1993 1995 1997 1999 2001 2003 2005

-- WE-12 Plant Outfall NE WE-20 Kennebec River

- --- - WE-12 Positive Concentrations

- WE-14 Boat Dock

_ WE- 14 Positive Concentration 49

FIGURE 6.7 CESIUM-137 IN SHORELINE SEDIMENT STATION SE-16, OLD OUTFALL AREA 700 600 500 i 400

, 300 200 100 0

Monti/Year 0 0-5 cm D 5-10 cm 010-15 cm Note: Sediment sampling was eliminated by ODCM change #29. No sediment samples were collected in 2004.

50

FIGURE 6.8 CESIUM-137 IN SHORELINE SEDIMENT STATION SE-18, FOXBIRD ISLAND 700 600 500 F 400 o1~

i 300 200 100 0

Month/Year 1 0-5cm S5 - 10 cm E2 10 - 15 cm Note: Sediment sampling was eliminated by ODCM change #29. No sediment samples were collected in 2004.

51

FIGURE 6.9 CESIUM-137 IN MILK 40 40 30- *30 20 - 20 10 -

• 10 0 -0

-10 -10 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2004

-- TM-1 8 Chewonki Foundation 6 TM-25 Hanson Farm 52

FIGURE 6.10 CESIUM-137 IN MILK ANNUAL AVERAGE CONCENTRATIONS 40 - 40 30 - 30

.20 20 10 / 10 0 0 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004

-- TM-15 Mitman Farm

--- TM-18 Chewonki Foundation

- -- TM-25 Hanson Farm C12~ -c 1 J)3

FIGURE 6.11 STRONTIUM - 90 IN MILK 2004 QUARTERLY COMPOSITES 25 25 20- -20 15- -15 10- -10 5- -5 a 0 A

0- -0

-5 I

- _3 Jan Apr Jul Oct Jan 2004

--- TM- 18 Chewonki Foundation 6 TM-25 Hanson Farm TM Positive Concentration A TM Positive Concentration C CGi2 54

FIGURE 6.12 STRONTIUM-90 IN MILK ANNUAL AVERAGE CONCENTRATIONS 25 25 20 - - 20 15- - 15 Q

10- - 10 5- -5 0- -0 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004

--- TM- 15 Mitman Farm

-- TM- 18 Chewonki Foundation 6 TM-25 Hanson Farm q0 55

FIGURE 6.13 EXPOSURE RATE AT INNER RING, OUTER RING AND CONTROL TLDS 25 -25 20 - - 20 0

15- - 15 I-04 10- -10

• - K 5- -5 199 1 . . 9 .1 . . . . . . . . . . . 0 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Retrieval Date

-Control

- - Inner Ring

- - X - Outer Ring

' -(0 56

FIGURE 6.14 EXPOSURE RATE AT INNER RING TLDS, TL 01-04 25 25 20 20 8 15 15 910 10 5 5 0

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Retrieval Date TL-01 Old Ferry Road

-X- TL-02 Old Ferry Road

- TL-03 Bailey House (ESL) 0 TL-04 Westport Island, Rt. 144 57

FIGURE 6.15 EXPOSURE RATE AT INNER RING TLDS, TL 05-08 25 25 20 20

= 15 15 92 0

• 210 10

~5 5

0 I . . . . . . . . . . . . . . I . . I I . 0 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Retrieval Date TL-05 MY Information Center

-X- TL-06 Rt. 144 & Greenleaf Road 6 TL-07 Westport Island, Rt. 144

- TL-08 MY Screenhouse 58

FIGURE 6.16 EXPOSURE RATE AT INNER RING TLDS, TL 09-10, 12-13 25 -25 20 20 o 15 15 0

0.

o 10 10 5 5 O . , . I I . 1 O 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Retrieval Date

--- TL-09 Westport Siren

-X- TL-1 0 Bailey Point 6 TL-12 Westport Firehouse 0 TL-13 Foxbird Island 59 C ,\?

FIGURE 6.17 EXPOSURE RATE AT INNER RING TLDS, TL 14-16 25 25 20 -20 0

15 - 15

.>10 - 10 5- -5 0 n- 0 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Retrieval Date TL- 14 Eaton Farm 6 TL-1 6 Eaton Farm

-x- TL-1 5 Eaton Farm 60

FIGURE 6.18 EXPOSURE RATE AT INNER RING TLDS, TL 17-19 25 - -25 20 - 20 15 - - 15 04 10 - -10 5- -5 o 4 . . I I. I' I I I I I Ir .. . I . . . . I I IX .i , ' Ir I u 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Retrieval Date TL-1 7 Eaton Fann 6 TL-19 Eaton Fann

-X- TL-1 8 Eaton Farm 61

FIGURE 6.19 EXPOSURE RATE AT OUTER RING TLDS, TL 11, 20-22 25 - 25 20 - - 20 15 - - 15 0

U:

10 - 10 5-0 A- 0 m

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Retrieval Date

-a- TL-I I Mason Station

-X- TL-20 Bradford Road, Wiscasset (Suspended 2003) 6 TL-21 Federal Street, Wiscasset (Suspended 2003) e TL-22 Cochran Road, Edgecomb (Suspended 2003) 62 C-I 16

FIGURE 6.20 EXPOSURE RATE AT OUTER RING TLDS, TL 23-26 (MONITORING SUSPENDED 2003) 25 -25 20 -20 9 15 - 15 o~10.1-

- 10

-5 I I . .I . I I 1 201 20 2 . 2, 0 l) 1996 1997 1998 1999 2000 2001 2002 2003 Retrieval Date TL-23 Middle Road, Edgecomb

-X- TL-24 River Road, Edgecomb 6 TL-25 River Road & Rt. 27

- TL-26 Rt. 27 & Boothbay RR Museum I

oc-1l a 63

FIGURE 6.21 EXPOSURE RATE AT OUTER RING TLDS, TL 27-30 (MONITORING SUSPENDED 2003) 25 25 20- - 20 z 15 - 15 0

.2 10 - 10 5- -5 0 2 00 . . , 23, 1996 1997 1998 1999 2000 2001 2002 2003 Retrieval Date

- TL-27 Barters Island

-X- TL-28 Westport Island, Rt. 144 & East Shore Road 6 TL-29 Harrison's Trailer

- TL-30 Leeman Farm, Woolwich 64 C -lt

FIGURE 6.22 EXPOSURE RATE AT OUTER RING TLDS, TL 31-35 (MONITORING SUSPENDED 2003) 25 25 20- - 20 a 15 - 15

• o 10 - 10 5- -5 0 . . . . . . . . . . . . . . . . . . . . . . . 2 02 2, 000 1996 1997 1998 1999 2000 2001 2002 2003 Retrieval Date TL-31 Barley Neck Road, Woolwich

-X- TL-32 Baker Farm, Woolwich 6 TL-33 Route 127, Woolwich 0 TL-34 Route 127, Woolwich W TL-35 Route 127, Woolwich 65 C26)9

FIGURE 6.23 EXPOSURE RATE AT CONTROL RING TLDS, TL 36-38 25 25 20 -20 0 15 - 15

.n 10 xxxx---xx-10 5 5 0 - ,11..,....I..., 0t 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Retrieval Date TL-36 Boothbay Harbor Fire Station

-X- TL-37 Bath Fire Station 6 TL-38 Dresden Substation 66

FIGURE 6.24 EXPOSURE AT ISFSI TLDS TL-I TL-I-04 25 25 12/19/01 First 2/27/04 Last Fuel Fuel Canister Canister Placed on Placed on ISFSI ISFSI 20 20 15 15 10 10 5 5 0

t)02 2003 Retrieval Date

-aTL-m-O I

--- TL-1-02 6 TL-1-03

- TL-1-04

- Average of Control TLDs 67

I FIGURE 6.25 EXPOSURE AT ISFSI TLDS TL-I TL-I-08 30 12/19/01 First 2/27/04 Last Fuel Canister 30 lFuel Canister Placed on ISFSI Placed on 25 25 ISFSI mll~pe r 91 days 20 15 15 110 10

• 5 5

l 2000 2001 2002 2003 2004 2005 Retrieval Date TL-I-OS I -

TL-I-06 07 3l - TL-1-08 Average of Control TLDs l

68 ,go

FIGURE 6.26 EXPOSURE AT ISFSI TLDS TL-I TL-I-12 35 35 12/19/01 First 2/27/04 Last Fuel Canister Placed on ISFSI 30 Fuel Canister 30 Placed on 25 25 mR per 9l days 20 20 15 15 10 10 5 5 2000 2001 2002 2003 2004 2005 Retrieval Date

--0--Th-1-09

-o TL-n-I0 6 TL-I-II METL-I- 12

-x- Average of Control TLDs 69

FIGURE 6.27 EXPOSURE AT ISFSI TLDS TL-I TL-I-17 35 35 30 12/19/01 First 2/27/04 Last Fuel 30 Fuel Canister Canister Placed on ISFSI Placed on 25 25 mR pe 91 days 20 20 15 15 10 10 5 5 2000 2001 002 2003 20 2005 Retrieval Date TL-1-I-13 TL-1-14

-aTL 1T5 TL-I-16

- Tb-I- 17

-X- Average of Control TLDs 70 m m m m Emmmor

7.0 QUALITY ASSURANCE PROGRAM The quality assurance program at the AREVA Framatome ANP Environmental Laboratory (FANPEL) is designed to serve two overall purposes: 1) Establish a measure of confidence in the measurement process to assure the licensee, regulatory agencies and the public that analytical results are accurate and precise; and 2) Identify deficiencies in the sampling and/or measurement process to those responsible for these operations so that corrective action can be taken. Quality assurance is applied to all steps of the measurement process, including the collection, measurement and reporting of data, as well as the record keeping of the final results. Quality control, as part of the quality assurance program, provides a means to control and measure the characteristics of the measurement equipment and processes, relative to established requirements.

The FANPEL employs a comprehensive quality assurance program designed to monitor the quality of analytical processing to ensure reliable environmental monitoring data. The program includes the use of controlled procedures for all work activities, a nonconformance and corrective action tracking system, systematic internal audits, audits by external groups, a laboratory quality control program, and a staff training program. Monitoring programs include the Intralaboratory Quality Control Program administered by the Laboratory QA Officer (used in conjunction with the National Institute of Standards and Technology Measurement Assurance Program, NIST MAP) and a third party cross check program administered by Analytics, Inc. Together these programs are targeted to supply QC/QA sources at 5% of the client sample analysis load. In addition a blind duplicate program is conducted through client environmental monitoring programs.

This summary reports all intralaboratory and third party results received by FANPEL on or before December 31, 2004.

7.1 Intralaboratory Quality Control Program The FANPEL QA Officer administers an extensive intralaboratory quality control program in which process check samples are submitted for analysis. These samples are "spiked" with a known amount of radioactive material and are routinely submitted in triplicate to evaluate the bias and precision of a measurement process. Table 7.1 provides the summary of the process check results for January to December 2004. Of the 665 analyses, 99.4% passed the bias criteria and 99.1% of the 215 results evaluated for precision were acceptable. The FANPEL internal acceptance criteria are summarized at the end of Table 7. 1.

71

7.2 Third Party Cross Check Program The FANPEL participates in a third party cross check program managed by Analytics Inc. to satisfy the requirement of the Environmental Technical Specification/ODCM. The FANPEL Analytics program was originally used to augment the EPA Intercomparison Program that it now replaces. The current program is designed to be comparable to the pre-1996 EPA PE Program in terms of the number of samples, matrices and nuclides. The results for the 4 h quarter 2003 through the 3d quarter 2004 are summarized in Table 7.2. Each sample is normally analyzed in triplicate and the results are evaluated against the internal acceptance criteria described in the FANPEL Manual 100-Laboratory Quality Assurance Plan. This acceptance protocol is used for all interlaboratory programs with no pre-set acceptance criteria. When results fall outside of the acceptance criteria, an investigation is initiated to determine the cause of the problem and if appropriate, corrective measures are taken. The FANPEL internal acceptance criteria are summarized at the end of Table 7.1.

7.3 Blind Duplicate Program Under the Blind Duplicate Quality Assurance Program, samples are split from homogeneous environmental media by the client and sent to the FANPEL for analysis. They are "blind" in that the identification of the matching sample is not identified to the Laboratory.

Participating clients submitted a total of 23 paired samples in 2004. The measurements evaluated include twenty-six gamma emitting radionuclides, H-3, Sr-89/90, and gross beta. All measurements are evaluated, whether the results are statistically positive or not, and whether the net concentration is positive or negative.

The samples submitted as part of this program are listed in Table 7.3. For the 2004 program, 99.8% (486/487) of the measurements met the FANPEL internal acceptance criteria.

7A Environmental TLD Quality Assurance Program Performance documentation of the routine processing of the Panasonic environmental TLDs (thermoluminescent dosimeter) program at the FANPEL is provided by the dosimetry quality assurance testing program. This program includes independent third party performance testing by Battelle Pacific Northwest Labs and internal performance testing conducted by the Laboratory QA Officer. Under these programs, sets of six dosimeters are irradiated to ANSI specified testing 72

criteria and submitted for processing to the Dosimetry Services Section as "unknowns". The bias and precision of TLD processing is measured against this standard and is used to indicate trends and changes in performance. Instrumentation checks, although routinely performed by the Dosimetry Services Group and representing between 5-10% of the TLDs processed, are not presented in this report because they do not represent a true process check sample since the exposures are known to the processor.

Ninety performance tests were conducted in 2004 by FANPEL and the third party tester. These tests were made on 15 separate sets of 6 dosimeters. All of the 15 TLD test sets passed the mean bias criteria of +20.1%. Of the ninety individual measurements, 100% of the dosimeter evaluations met the FANPEL Internal Acceptance Criteria for bias (+/-20.1%) and precision

(+/-12.8%). Third Party QC results are summarized below.

Percentage of Individual Analyses that passed FANPEL Internal Criteria Dosimeter Type Number %Passed Bias Criteria %Passed Precision Criteria Tested Panasonic Environmental 90 100 100 Summary of Third Party Testing Dosimeter Type l Exposure Period ANSI Category  % (Bias +/- SD)

Panasonic Environmental Q4/2003 II, high energy 4.2 +/- 0.8

., Q1/2004 II, high energy -0.3 +/- 1.0

., Q2/2004 II, high energy 2.8 +/- 1.4

.. Q3/2004 II, high energy 1.6 +/- 0.3

• American National Standards Institute (ANSI) Performance Statistic as referenced in the Dosimetry Services Semi-Annual QA Status Report.

Note: Results are expressed as the delivered exposure for environmental TLD. ANSI HPS N13.29-1995 (Draft) Category 11, High energy photons (Cs- 137 or Co-60).

73

TABLE 7.1 FANPEL RESULTS IN THE INTRALABORATORY PROCESS CONTROL PROGRAM January - December 2004 Media Bias Criteria (1) Precision Criteria (2)

Analysis 1 2 3 4 1 2 3 4 6- 1.Air Charcoal Gamma-Quantitative 6 2 0 0 0 0 0 0 Gamma-Screening 83 31 18 0 0 0 0 0 I. Air Filter Beta 243 15 0 0 0 0 0 0 III. Milk Gamma 6 0 0 0 9 0 0 0 IV. Water Gross Alpha 13 13 28 0 2 0 28 0 Gross Beta 22 13 24 4 10 8 12 0 Gamma 53 7 0 0 0 2 56 2 lodine-LL 9 3 1 0 9 3 1 0 Sr-90 11 6 14 0 0 0 34 0 Tritium 31 5 4 0 11 6 22 0 Total Number in Range 477 95 89 4 41 19 153 2 Percentage of Total 71.7 14.3 13.4 0.6 19.1 8.8 71.2 0.9 Processed _ _ __ _ _ _ I__ _ _ _ _ _ _ _ _ _ _ I__ _ _ _ _ _ _ _ _ I__

Sum of Analyses 665 215 (1) Percent Bias Criteria by Bias Category (2) Percent Precision Criteria by Precision Category Bias Category = I > 0% and < = 5% Precision Category = I > 0% and < = 5%

Bias Category = 2 > 5% and < = 10% Precision Category = 2 > 5% and < = 10%

Bias Category = 3 > 10% and < = 15%, or Precision Category = 3 > 10% and < = 15%, or within 2 sigma of known within 2 sigma of mean Gross alpha/beta water, Sr 89/90 > 10% and < = 25% Precision Category = 4 Outside Criteria Transuranics > 10% and <= 20%

Bias Category = 4 Outside Criteria 74

TABLE 7.2 FANPEL RESULTS IN THE ANALYTICS INC. CROSS CHECK PROGRAM Quarter 4, 2003 - Quarter 3, 2004 Ratio, Sample Quarter/ Sample Reported Known E-LABI Number Year, Medla- Nuclide Value ^Value -Analycs Evaluation E3937-162 4th/2003 Water H-3 2307 2290 1.01 Agreement E3938-162 4th/2003 Water Sr-89 99 100 0.99 Agreement Sr-90 11 10 1.10 Aareement E3939-162 4th/2003 Filter Gross Alpha 15 16 0.94 Agreement Gross Beta 50 47 1.06 Agreement E3940-162 4th2003 Filter Ce-141 110 100 1.10 Agreement Cr-51 171 153 1.12 Agreement Cs-134 75 74 1.01 Agreement Cs-137 75 71 1.06 Agreement Co-58 64 61 1.05 Agreement Mn-54 103 95 1.08 Agreement Fe-59 64 56 1.14 Agreement Zn-65 117 108 1.08 Agreement Co-60 82 85 0.96 Agreement E3941 -162 4th/2003 Filter Sr-89 103 109 0.94 Agreement Sr-90 11 11 1.00 AgreemenI 1-131 LL by beta-E3942-162 4th/2003 Milk gamma 91 90 1.01 Agreement 1-131 LL by prop.

counter 89 90 0.99 Agreement 1-131 84 90 0.93 Agreement Ce-141 191 202 0.95 Agreement Cr-51 275 280 0.98 Agreement Cs-134 135 135 1.00 Agreement Cs-137 126 129 0.98 Agreement Co-58 107 111 0.96 Agreement Mn-54 173 173 1.00 Agreement Fe-59 106 102 1.04 Agreement Zn-65 203 197 1.03 Agreement Co-60 148 155 0.95 Agreement E4057-162 1st/2004 Water Gross Alpha 72.3 74.5 0.97 Agreement Gross Beta 286 301 0.95 Agreement E4058-162 1stU2004 Water 1-131LL 88.7 90.2 0.98 Agreement 1-131 94 90.2 1.04 Agreement Ce-141 87.5 85 1.03 Agreement Cr-51 335 326 1.03 Agreement Cs-134 86 89.7 0.96 Agreement Cs-137 186 185 1.00 Agreement Co-58 113 112 1.01 Agreement Mn-54 112 114 0.99 Agreement

• pCi/Liter (Filters in pCi) 75

TABLE 7.2 (cont'd)

FANPEL RESULTS IN THE ANALYTICS INC. CROSS CHECK PROGRAM Quarter 4, 2003 - Quarter 3, 2004 Ratio Sample Quarterl Sample Reported Known E-LABI Number -'Year Media Nuclide Value Value Analytics Evaluation E4058-162 1st/2004 Water Fe-59 60.8 56.7 1.07 Agreement Zn-65 149.1 143 1.04 Agreement Co-60 151.4 153 0.99 Agreement E4060-162 1st/2004 Filter Gross Alpha 48.1 58.9 0.82 Agreement Gross Beta 231 218 1.06 Agreement E4061-162 1st/2004 Milk 1-131LL 83.6 77.7 1.08 Agreement 1-131 77.7 77.7 1.00 Agreement Ce-141 92 85.2 1.08 Agreement Cr-51 314 327 0.96 Agreement Cs-134 88.7 90 0.99 Agreement Cs-1i37 188.6 185 1.02 Agreement Co-58 115 112 1.03 Agreement Mn-54 114.7 114 1.01 Agreement Fe-59 59.7 56.8 1.05 Agreement Zn-65 145.5 143 1.02 Agreement Co-60 154.8 153 1.01 Agreement E4062-162 1st/2004 Milk Sr-89 86.2 103 0.84 Agreement Sr-90 12.7 12.1 1.05 Agreement E4059-162 1stl2004 Water Sr-89 107.7 123 0.88 Agreement Sr-90 14.85 14.5 1.02 Agreement E4182-162 2nd/2004 Water H-3 11680 11900 0.98 Agreement E4183-162 2nd/2004 Filter Gross Alpha 46.8 48.8 0.96 Agreement Gross Beta 156 160 0.98 Agreement E4184A-162 2nd/2004 Filter Ce-141 86 88.3 0.97 Agreement Cr-51 127 128 0.99 Agreement Cs-134 54 56.9 0.94 Agreement Cs-137 90 87.8 1.03 Agreement Co-58 27 26 1.03 Agreement Mn-54 42 39.7 1.06 Agreement Fe-59 27 25.1 1.09 Agreement Zn-65 62 56 1.11 Agreement Co-60 92 96.8 0.95 Agreement E4185-162 2nd/2004 Filter Sr-89 Sr-90 MAPEP RdF12 May 2004 Filter Sr-90 20.3 22.4 0.91 Agreement E4186-162 2nd/2004 Milk 1-131 55 58.2 0.95 Agreement I-131LL 59 58.2 1.01 Agreemenl Ce-141 165 157 1.06 Agreement Cr-51 241 228 1.06 Agreement

• pCi/Liter (Filters in pCi)

• • Problems encountered in filter dissolution, sample re-ordered. MAPEP filter used as replacement.

76

TABLE 7.2 (cont'd)

FANPEL RESULTS IN THE ANALYTICS INC. CROSS CHECK PROGRAM Quarter 4, 2003 - Quarter 3, 2004 Ratio Sample  ; Quarterl Samplei Reported Known E-LABI Number Year Media i4Nuclide Value Value - Analytics Evaluation, E4186-162 2nd/2004 Milk Cs-134 99 101 0.98 Agreement Cs-137 157 156 1.01 Agreement Co-58 46 46.2 1.00 Agreement Mn-54 73 70.5 1.04 Agreement Fe-59 48 44.5 1.08 Agreement Zn-65 100 99.3 1.01 Agreement Co-60 175 172 1.02 Agreement E4269-162 3rd/2004 Water Gross Alpha 41.3 42.7 0.97 Agreement Gross Beta 214 225 0.95 Agreement E4270-162 3rd/2004 Water 1-131 70.5 70.8 1.00 Agreement 1-131LL 67.8 70.8 0.96 Agreement Ce-141 258 250 1.03 Agreement Cr-51 230 223 1.03 Agreement Cs-134 93.4 96.4 0.97 Agreement Cs-137 217 215 1.01 Agreement Co-58 93.4 94.6 0.99 Agreement Mn-54 181 181 1.00 Agreement Fe-59 95.2 91.6 1.04 Agreement Zn-65 180 178 1.01 Agreement Co-60 126 125 1.01 Agreement E4271 -162 3rd/2004 Filter Gross Alpha 38.3 36.8 1.04 Agreement Gross Beta 191 194 0.98 Agreement E4272-162 3rd/2004 Milk 1-131 81.1 83.5 0.97 Agreement 1-131LL . 79.4 83.5 0.95 Agreement Ce-141 240 235 1.02 Agreement Cr-51 214 210 1.02 Agreement Cs-134 89.5 90.6 0.99 Agreement Cs-137 204 202 1.01 Agreement Co-58 90.9 89 1.02 Agreement Mn-54 173 171 1.01 Agreement Fe-59 91.3 86.1 1.06 Agreement Zn-65 169 167 1.01 Agreement Co-60 116 118 0.98 Agreement E4273-162 3rd/2004 Milk Sr-89 99.2 102 0.97 Agreement Sr-90 23.4 24.5 0.96 Agreement E4340-162 3rd/2004 Filter Sr-89 151 152 1.00 Agreement Sr-90 53.5 58.8 0.91 Agreement

• pCi/Liter (Filters in pCi)

Bias and Precision Acceptance Criteria as described above.

77

TABLE 7.3

SUMMARY

OF BLIND DUPLICATE SAMPLES January - December 2004 TYPE OF SAMPLE NUMBER OF PAIRED SAMPLES SUBMITTED Ground Water 2 Surface Water 17 Algae 2 Mussels 2 TOTAL 23 78

8.0 LAND USE CENSUS Maine Yankee ODCM section 2.4.4 requires that a Land Use Census be conducted annually. The Census identifies the locations of the nearest milk animal, the nearest residence and the nearest garden of greater than 500 square feet producing fresh leafy vegetables in each of the 16 meteorological sectors within a distance of five miles of the plant. The 2004 Land Use Census was completed in October, 2004.

Pursuant to Section 2.4.4 of the ODCM, a dosimetric analysis is performed, using site specific meteorological data, to determine which milk animal locations would provide the optimal sampling locations. If any location has twice the potential dose commitment of a currently-sampled location, the new location is added to the routine environmental sampling program in replacement of the location with the lowest calculated dose (which is eliminated from the program). For the 2004 Census, no such new milk animal location was identified. Consequently, no changes were made in the milk sampling program. It should be noted that per ODCM Change

1. 29 (Reference 8), the need for milk sampling (or substitute vegetation sampling) was dropped from the REMP requirements in July, 2004.

The results of the 2004 Land Use Census are included in this report in compliance with ODCM Section 2.4.4.3 and ODCM Appendix C, item 1. The locations identified during the Census may be found in Table 8.1.

79

TABLE 8.1 2004 LAND USE CENSUS LOCATIONS SECTOR NEAREST NEAREST NEAREST MILK RESIDENCE GARDEN ANIMAL km (miles) km (miles) km (miles)

N 1.26(0.78) _

NNE 2.23 (1.38) 2.40(1.49) 2.65 (1.7) (Cows)**

NE 1.27 (0.79) 1.47 (0.91)

ENE 0.92 (0.57) 1.25 (0.78)

E 0.90 (0.56) 0.9 (0.56)

ESE 0.70 (0.43)

SE 0.70 (0.43) 0.9 (0.56)

SSE 0.9 (0.56) 0.9 (0.56)

S 1.7 (1.06) 1.7 (1.06)

SSW 3.0 (1.86) 5.0 (3.11)

• SW 1.50(0.93) 4.0 (2.48)

WSW 0.96 (0.60) 1.94 (1.20) 1.88 (1.2) (Cows)

W 0.81 (0.50) 2.71 (1.68)

WNW 1.90 (1.18)

NW 1.93 (1.20) 1.93 (1.20)

NNW 1.06 (0.66) 1.18 (0.73)

• No location was identified within 5 miles of the plant.

Due to limited milk supply, this location would not be a reliable source of routine sample collection as part of REMP.

80

9.0 REFERENCES

1. USNRC Radiological Assessment Branch Technical Position, "An Acceptable Radiological Environmental Monitoring Program," Revision 1, November 1979.

2. NCRP Report No. 94, Exposure of the Population in the UnitedStates and Canada from NaturalBackground Radiation,National Council on Radiation Protection and Measurements, 1987.

3. Ionizing Radiation: Sources andBiologicalEffects, United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), 1982 Report to the General Assembly.

4. Kathren, Ronald L., Radioactivity and the Environment - Sources, Distribution,and Surveillance, Harwood Academic Publishers, New York, 1984.

5. Maine Yankee FinalSafety Analysis Report.

6. NRC Generic Letter 89-01,

Subject:

Implementation of Programmatic Controls for Radiological Effluent Technical Specifications in the Administrative Controls Section of the Technical Specifications and the Relocation of Procedural Details of RETS to the Offsite Dose Calculation Manual or to the Process Control Program. Dated January31, 1989.

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

8. Maine Yankee Offsite Dose Calculation Manual (ODCM), Change #29, dated July 21, 2004, Maine Yankee Atomic Power Company.

81

Appendix A MY Radiological Environmental Monitoring Program Summary of 2004 Data A-I

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/l3)

AP DEMO 22 L8363-01 10/12/2004 GROSS BETA 5.01E-02 3.80E-03 9.1OE-03

• AP DEMO 22 L8363-05 10/20/2004 GROSS BETA 2.03E-02 2.60E-03 7.10E-03

• AP DEMO 22 L8405-01 10/26/2004 GROSS BETA 2.00E-02 3.40E-03 9.90E-03

• AP DEMO 22 L8405-05 11/3/2004 GROSS BETA 5.03E-02 3.50E-03 8.90E-03

• AP DEMO 22 L8536-01 11/9/2004 GROSS BETA 3.84E-02 4.1OE-03 1.1OE-02 * +

AP DEMO 22 L8536-05 11/17/2004 GROSS BETA 3.45E-02 2.90E-03 7.30E-03

• AP DEMO 22 L8537-01 11/23/2004 GROSS BETA 2.80E-02 3.80E-03 1.1OE-02 * +

AP DEMO 22 L8537-04 11/30/2004 GROSS BETA 1.72E-02 3.40E-03 1.OOE-02

• AP DEMO 22 L8655-01 12/8/2004 GROSS BETA 2.27E-02 3.OOE-03 8.40E-03

• AP DEMO 22 L8655-04 12/16/2004 GROSS BETA 2.80E-02 3.80E-03 1.1OE-02 * +

AP DEMO 22 L8809-01 12/28/2004 AcTh-228 1.OOE-04 2.30E-03 8.20E-03 AP DEMO 22 L8809-01 12/2812004 Ag-108m 8.00E-05 4.30E-04 1.SOE-03 AP DEMO 22 L8809-01 12/28/2004 Ag-llOm -7.60E-04 9.OOE-04 3.50E-03 AP DEMO 22 L8809-01 12/28/2004 Ba-140 5.00E-02 I.OOE-01 3.90E-01 AP DEMO 22 L8809-01 12/28/2004 Be-7 3.00E-02 1.90E-02 6.40E-02 AP DEMO 22 L8809-01 12/28/2004 Ce-141 1.27E-02 5.70E-03 1.80E-02 AP DEMO 22 L8809-01 12/28/2004 Cc-144 1.90E-03 3.30E-03 1.1OE-02 AP DEMO 22 L8809-01 12/28/2004 Co-57 -6.50E-04 3.50E-04 1.30E-03 AP DEMO 22 L8809-01 12128/2004 Co-5S8 -8.00E-04 1.40E-03 5.40E-03 AP DEMO 22 L8809-01 12/28/2004 Co-60 6.91E-03 7.40E-04 2.40E-03 AP DEMO 22 L8809-01 12/28/2004 Cr-51 1.70E-02 5.50E-02 1.90E-01 AP DEMO 22 L8809-01 12/28/2004 Cs-134 1.27E-03 5.90E-04 1.80E-03 AP DEMO 22 L8809-01 12/28/2004 Cs-137 2.40E-04 6.10E-04 2.10E-03 AP DEMO 22 L8809-01 12/28/2004 Fe-59 4.70E-03 5.50E-03 1.90E-02 AP DEMO 22 L8809-01 12/28/2004 1-131 -1.50E+00 1.50E+00 5.70E+00 AP DEMO 22 L8809-01 12/28/2004 K-40 2.18E-02 8.70E-03 2.70E-02 AP DEMO 22 L8809-01 12/28/2004 La-140 5.OOE-02 1.20E-01 4.50E-01 AP DEMO 22 L8809-01 12/28/2004 Mn-54 4.10E-04 6.60E-04 2.30E-03 AP DEMO 22 L8809-01 12/28/2004 Nb-95 1.80E-03 3.60E-03 1.30E-02 AP DEMO 22 L8809-01 12/28/2004 Ru-103 -2.SOE-03 2.90E-03 1.1OE-02 AP DEMO 22 L8809-01 12/28/2004 Ru-106 -2.90E-03 5.70E-03 2.1OE-02 AP DEMO 22 1809-01 1228/2004 Sb-124 -9.50E-03 3.10E-03 1.60E-02 AP DEMO 22 L8809-01 12/28/2004 Sb-125 2.50E-03 1.30E-03 4.20E-03 AP DEMO 22 L8809-01 12/28/2004 Se-75 2.OOE-04 1.IOE-03 3.70E-03 AP DEMO 22 L8809-01 12/28/2004 Zn-65 2.90E-03 2.70E-03 9. 1OE-03 AP DEMO 22 L8809-01 12/28/2004 Zr-95 -2.00E-04 2.00E-03 7.40E-03 AP DEMO 24 L7039-04 2/24/2004 GROSS BETA 2.28E-02 1.80E-03 4.40E-03 AP DEMO 24 L7432-01 2/24/2004 AcTh-228 -1.20E-02 2.50E-02 1.IOE-0I AP DEMO 24 L7432-01 2/24/2004 Ag-108m -5.80E-03 5.80E-03 2.50E-02 AP DEMO 24 L7432-01 2/24/2004 Ag-Il0m 3.1OE-02 1.50E-02 4.10E-02 AP DEMO 24 L7432-01 2/24/2004 Ba-140 2.20E+00 2.70E+00 1.00E+01 AP DEMO 24 L7432-01 2/24/2004 Be-7 3.20E-01 2.OOE-01 6.40E-01 AP DEMO 24 L7432-01 2/24/2004 Cc-141 -2.30E-02 7.60E-02 2.90E-01 AP DEMO 24 L7432-01 2/24/2004 Ce-144 2.00E-02 5.IOE-02 1.80E-01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-2

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 24 L7432-01 2/24/2004 Co-57 1.60E-03 5.20E-03 I.90E-02 AP DEMO 24 L7432-01 2/24/2004 Co-58 -1.40E-02 1.70E-02 S.IOE-02 AP DEMO 24 L7432-01 2/24/2004 Co-60 2.40E-02 1.20E-02 3.50E-02 AP DEMO 24 L7432-01 2/24/2004 Cr-51 -1.ISE+00 6.70E-01 3.OOE+00 AP DEMO 24 L7432-01 2/24/2004 Cs-134 1.40E-03 7.40E-03 3.1OE-02 AP DEMO 24 L7432-01 2/24/2004 Cs-137 -8.80E-03 8.OOE-03 3.60E-02 AP DEMO 24 L7432-01 2/24/2004 Fe-59 -7.90E-02 6.90E-02 3.40E-01 AP DEMO 24 L7432-01 2/24/2004 1-131 -3.70E+01 5.90E+01 2.40E+02 AP DEMO 24 L7432-01 2/24/2004 K-40 -4.IOE-01 1.30E-01 6.60E-01 AP DEMO 24 L7432-01 2/24/2004 La-140 2.50E+00 3.10E+00 1.20E+01 AP DEMO 24 L7432-01 2/24/2004 Mn-54 -4.40E-03 7.20E-03 3.40E-02 AP DEMO 24 L7432-01 2/24/2004 Nb-95 4.OOE-03 6.OOE-02 2.40E-01 AP DEMO 24 L7432-01 2/24/2004 Ru-103 2.10E-02 3.60E-02 1.40E-01 AP DEMO 24 L7432-01 2/24/2004 Ru-106 8.70E-02 9.60E-02 3.40E-01 AP DEMO 24 L7432-01 2/24/2004 Sb-124 -5.70E-02 5.70E-02 3.10E-01 AP DEMO 24 L7432-01 2/24/2004 Sb-125 -2.80E-02 2.103E-02 9. 1OE-02 AP DEMO 24 L7432-01 2/24/2004 Se-75 1.IOE-02 1.20E-02 4.40E-02 AP DEMO 24 L7432-01 2/24/2004 Zn-65 -L.SOE-02 2.20E-02 1.OOE0-I AP DEMO 24 L7432-01 2/24/2004 Zr-95 -2.80E-02 2.90E-02 1.40E-0I AP DEMO 30 L6996-03 2/14/2004 GROSS BETA 3.73E-02 2.20E-03 4.70E-03 AP DEMO 30 L7039-03 2/25/2004 GROSS BETA 2.26E-02 2.00E-03 S.OOE-03

• AP DEMO 30 L7103-01 3/10/2004 GROSS BETA 2.84E-02 3.10E-03 8.60E-03 AP DEMO 30 L7103-05 3/4/2004 GROSS BETA 2.77E-02 2.20E-03 5.60E-03

• AP DEMO 30 L7179-04 3/17/2004 GROSS BETA 3.39E0-2 2.30E-03 5.40E-03

• AP DEMO 30 L7179-0s 3/24/2004 GROSS BETA 3.79E-02 2.40E-03 5.50E-03

• AP DEMO 30 L7432-02 3/24/2004 AcTh-228 -8.OOE-04 6.60E-03 2.80E-02 AP DEMO 30 L7432-02 3/24/2004 Ag-108m O.OOE+00 1.60E-03 6.10E-03 AP DEMO 30 L7432-02 3/24/2004 Ag-1lom 3.soE-03 3.60E-03 1.30E-02 AP DEMO 30 L7432-02 3/24/2004 Ba-140 -1.00E-01 2.60E-01 1.20E+00 AP DEMO 30 L7432-02 3/24/2004 Be-7 4.90E-02 4.70E-02 1.60E-01 AP DEMO 30 L7432-02 3/24/2004 Cc-141 O.OOE+00 1.30E-02 4.70E-02 AP DEMO 30 L7432-02 3/24/2004 Ce-144 -1.30E-02 L.00E-02 4.00E-02 AP DEMO 30 L7432-02 3/24/2004 Co-57 7.00E-04 1.lOE-03 4.00E-03 AP DEMO 30 L7432-02 3/24/2004 Co-58 6.00E-04 3.20E-03 1.40E-02 AP DEMO 30 L7432-02 3/24/2004 Co.60 2.30E-03 1.SOE-03 6.20E-03 AP DEMO 30 L7432-02 3/24/2004 Cr-51 -1.30E-0I 1.IOE-01 4.50E-0I AP DEMO 30 L7432-02 3/24/2004 Cs-134 2.20E-03 2.OOE-03 7.00E-03 AP DEMO 30 L7432-02 3/24/2004 Cs-137 2.1OE-03 2.00E-03 7.00E-03 AP DEMO 30 L7432-02 3/24/2004 Fe-59 9.OOE-03 1.30E-02 5.OOE-02 AP DEMO 30 L7432-02 3/24/2004 1-131 2.20E+00 2.60E+00 9.30E+00 AP DEMO 30 L7432-02 3/24/2004 K-40 -1.33E-01 2.00E-02 1.SOE-0I AP DEMO 30 L7432-02 3/24/2004 La-140 -1.IOE-01 3.00E-01 1.40E+00 AP DEMO 30 L7432-02 3/24/2004 Mn-54 -IO.IE-03 2.SOE-03 I.OOE-02 AP DEMO 30 L7432-02 3/24/2004 Nb-95 -1.02E-02 9.OOE-03 4.20E-02

• Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-3

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 30 L7432-02 3/24/2004 Ru-103 -3.60E-03 7.20E-03 3.00E-02 AP DEMO 30 L7432-02 3/24/2004 Ru-106 -5.OOE-03 L.80E-02 7.40E-02 AP DEMO 30 L7432-02 324/2004 Sb-124 0.OOE+O0O 1.30E-02 5.90E-02 AP DEMO 30 L7432-02 3/24/2004 Sb-125 -2. 10E-03 5.30E-03 2.1 OE-02 AP DEMO 30 L7432-02 3/24/2004 Se-75 .IOE-03 2.90E-03 1.1OE-02 AP DEMO 30 L7432-02 3/24/2004 Zn-65 -3.40E-03 4.1OE-03 2.OOE-02 AP DEMO 30 L7432-02 3/24/2004 Zr-95 1.70E-03 7.40E-03 3.00E-02 AP DEMO 30 L7755-02 3/30/2004 GROSS BETA 3.34E-02 2.80E-03 6.90E-03

• AP DEMO 30 L7755-06 4/3/2004 GROSS BETA 1.691E-02 2.301E-03 6.soE-03

• AP DEMO 30 L7756-04 4/14/2004 GROSS BETA 1.64E-02 1.60E-03 4.20E-03

• AP DEMO 30 L7756-08 4/21/2004 GROSS BETA 2.81E-02 2.SOE-03 6.20E-03

• AP DEMO 30 L7757-03 4/28/2004 GROSS BETA 2.07E-02 2.20E-03 5.soE-03

• AP DEMO 30 L7757-07 5/5/2004 GROSS BETA 2.26E-02 2.30E-03 6.IOE-03

• AP DEMO 30 L7759-03 5/12/2004 GROSS BETA 2.23E-02 2.70E-03 7.60E-03 AP DEMO 30 L7759-06 5/19/2004 GROSS BETA 2.42E-02 2.70E-03 7.50E-03

• AP DEMO 30 L7759-11 5/26/2004 GROSS BETA 1.92E-02 2.50E-03 7.30E-03

• AP DEMO 30 L7878-01 5/26/2004 AcTh-228 2.1 OE-03 4.20E-03 1.soE-02 AP DEMO 30 L7878-01 5/26/2004 Ag-108m 1.60E-04 9.70E-04 3.60E-03 AP DEMO 30 L7878-01 5/26/2004 Ag-l lOn 4.00E-04 2.00E-03 7.70E-03 AP DEMO 30 L7878-O1 5/26/2004 Ba-140 -1.OOE-0I 1.soE-O 9.40E-01 AP DEMO 30 L7878-01 5/26/2004 Bc-7 5.30E-02 4.30E-02 1.40E-01 AP DEMO 30 L7878-01 5/26/2004 Ce-141 -9.OOE-03 1.10E-02 4.10E-02 AP DEMO 30 L7878-01 5/26/2004 Ce-144 -2.00E-04 6.70E-03 2.40E-02 AP DEMO 30 L787s-01 5/26/2004 Co-57 -1.SOE-04 7.90E-04 2.80E-03 AP DEMO 30 L7878-0 5/26/2004 Co-5S -2.SOE-03 3.60E-03 1.40E-02 AP DEMO 30 L7878-01 5/26/2004 Co-60 -2.40E-03 1.80E-03 7.80E-03 AP DEMO 30 L7878-01 5/26/2004 Cr-sI 4.00E-02 IOE-0I 3.80E-O1 AP DEMO 30 L7878-01 5/26/2004 Cs-134 3.00E-04 1.SOE-03 5.60E-03 APDEMO 30 L7878-01 5/26/2004 Cs-137 2.soE-03 2.30E-03 7.60E-03 AP DEMO 30 L7878-O0 5/26/2004 Fe-59 -3.OOE-03 1.20E-02 4.80E-02 AP DEMO 30 L7878-01 5/26/2004 1-131 4.30E+00 4.10E+00 1.40E+OI AP DEMO 30 L7878-01 5/26/2004 K-40 -9.00E-03 2.00E-02 7.90E-02 AP DEMO 30 L7878-01 5/26/2004 La-140 -1.20E-01 2.001E-01 .10E+00 AP DEMO 30 L7878-O1 5/2612004 Mn-54 O.OOE+00 1.40E-03 5.40E-03 AP DEMO 30 L7878-01 5/26/2004 NbM95 -1.30E-02 1.IOE-02 4.40E-02 AP DEMO 30 L7878-01 5/26/2004 Ru-103 4.70E-03 5.50E-03 1.90E-02 AP DEMO 30 L7878-01 5/26/2004 Ru-106 5.00E-03 1.40E-02 5.20E-02 AP DEMO 30 L7878-01 5/26/2004 Sb-124 -5.OOE-03 1.20E-02 5.OOE-02 AP DEMO 30 L7878-01 5/26/2004 Sb-125 -1.00E-03 3.20E-03 1.20E-02 AP DEMO 30 L7878-01 5/26/2004 Se-75 -5.OOE-04 2.10E-03 7.90E-03 AP DEMO 30 L7878-O0 5/26/2004 Zn-65 -7.00E-03 3.90E-03 1.80E-02 AP DEMO 30 L7878-01 5/26/2004 Zr-95 4.soE-03 5.30E-03 1.901E-02 AP DEMO 30 L7930-05 6/8/2004 GROSS BETA 1.66E-02 2.80E-03 8.30E-03

• AP DEMO 30 L793I-01 6/16/2004 GROSS BETA 1.97E-02 2.00E-03 5.30E-03

• AP DEMO 30 L7931-O5 6/23/2004 GROSS BETA 2.63E-02 2.40E-03 6.30E-03 *

• Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-4

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

APDEMO 30 L7939-01 6/30/2004 GROSS BETA 2.16E-02 2.30E-03 6.30E3-03

• AP DEMO 30 L7939-05 7/7n2004 GROSS BETA 2.631E-02 2.40E-03 6.20E3-03

• AP DEMO 30 L7940-01 7/13/2004 GROSS BETA 2.46E-02 2.60E-03 6.70E-03

• AP DEMO 30 L8320-01 7/13/2004 AcTh-228 -2.80E-03 4.10E-03 I1.60E-02 AP DEMO 30 L8320-01 7/13/2004 Ag-108m I1.34E-03 9. 1OE-04 3.OOE-03 AP DEMO 30 L8320-01 7/13/2004 Ag-I lOm 3.90E-03 2. 1OE-03 6.50E-03 AP DEMO 30 L8320-01 7/13/2004 Ba-140 I1.20E+01 1.00E+0I 3.40E+01 APDEMO 30 L8320-01 7/13/2004 Be-7 -2.001E-02 7.30E-02 2.7013-01 AP DEMO 30 L8320-01 7/13/2004 Ce-141 -8.50E-02 5.1 OE-02 I1.90E-01 AP DEMO 30 L8320-01 7/13/2004 Ce-144 2.60E-03 8.80E-03 3.001E-02 AP DEMO 30 L8320-01 7/13/2004 Co-57 -1.37E-03 9.40E-04 3.50E-03 AP DEMO 30 L8320-01 7/13/2004 Co-58 2. IOE-03 5.30E-03 I1.90E-02 AP DEMO 30 L8320-01 7/13/2004 Co60 7.OOE-04 1.20E-03 4.50E-03 APDEMO 30 L8320-01 7/13/2004 Cr-SI -5.001E-01 5.20E-0I 2.OOE+00 AP DEMO 30 L8320-01 7/13/2004 Cs-134 2.00E-04 1.20E-03 4.60E-03 AP DEMO 30 L8320-01 7/13/2004 Cs-137 I1.301E-03 I. IOE-03 3.70E-03 AP DEMO 30 L8320-01 7/13/2004 Fe-59 2.30E-02 2.60E-02 9.20E-02 AP DEMO 30 L8320-01 7/13/2004 1-131 *5.OOE+02 1.30E+03 4.80E+03 APDEMO 30 L8320-01 7/13/2004 K-40 I1.50E-02 1.60E-02 5.50OE-02 AP DEMO 30 L8320-01 7/13/2004 La-140 I1.40E+01 1.20E+01 3.90E+01 APDEMO 30 L8320-01 7/13/2004 Mn-54 -3.00E-04 1.60E-03 6.20E-03 APDEMO 30 L8320-01 7/13/2004 Nb-95 -7.40E-02 3.00E-02 I1.30E-01 AP DEMO 30 L8320-01 7/13/2004 Ru-103 0.OOE+00 1.90E-02 6.80E-02 AP DEMO 30 L8320-01 7/13/2004 Ru-106 0.00E+00 1.40E-02 5.10E-02 AP DEMO 30 L8320-01 7/13/2004 Sb-124 -2.OOE-02 1.90E-02 8.20E-02 AP DEMO 30 L8320-01 7/13/2004 Sb-125 7.30E-03 3.1 OE-03 9.7013-03 AP DEMO 30 L8320-01 7/13/2004 Se-75 -I1.60E-03 3.40E-03 I1.20E3-02 APDEMO 30 L8320-01 7/13/2004 Zn-65 -2.30E-03 2.60E-03 I1.20E-02 AP DEMO 30 L8320-01 7/13/2004 Zr-95 4.OOE-03 I.OOE-02 3.70E-02 AP DEMO 36 L7432-03 2/17/2004 AcTh-228 -I1.2013-02 I.SOE-02 6.901E-02 AP DEMO 36 L7432-03 2/17/2004 Ag-108m 8.OOE3-04 3. 1OE-03 I1.20E-02 AP DEMO 36 L7432-03 2/17/2004 Ag-I lOm 5.OOE-03 8.00E-03 3.OOE-02 APDEMO 36 L7432-03 2/17/2004 Ba-140 9.OOE-01 2. 1OE+00 8.60E+00 AP DEMO 36 L7432-03 2/17/2004 Be-7 3.OOE-02 1.60E-0I 5.90E-01 AP DEMO 36 L7432-03 2/17/2004 Ce-141 -1.50E-02 5.80E-02 2.10E-01 AP DEMO 36 L7432-03 2/17/2004 Ce-144 -8.0013-03 2.70E-02 I .001E-0 I AP DEMO 36 L7432-03 2/17/2004 Co-57 3. IOE-03 3.OOE-03 I.OO-02 AP DEMO 36 L7432-03 2/17/2004 Co-58 -7.OOE-03 1.40E-02 5.80E-02 APDEMO 36 L7432-03 2/17/2004 Co-60 7.20E-03 6.SOE-03 2.301E-02 AP DEMO 36 L7432-03 2/17/2004 Cr-5 I -8.60E-01 4.00E-01 I.909+00 AP DEMO 36 L7432-03 2/17/2004 Cs-134 -3.60E-03 4.40E-03 2. 1OE-02 AP DEMO 36 L7432-03 2/17/2004 Cs-137 -7.OOE-04 3.70E-03 I1.60E-02 AP DEMO 36 L7432-03 2/17/2004 Fc-59 -6.60E-02 4.lOE-02 2.20E-01I AP DEMO 36 L7432-03 2/17/2004 1-131 3.9013+01 5.OOE+OI 1.8013+02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-5

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L7432-03 2/17/2004 K-40 -2.35E-01 6.10E-02 3.SOE-01 AP DEMO 36 L7432-03 2/17/2004 La-140 1.lOE+00 2.40E+00 9.90E+00 AP DEMO 36 L7432-03 2/17/2004 Mn-54 -8.00E-03 5.40E-03 2.60E-02 AP DEMO 36 L7432-03 2/17/2004 Nb-95 3.1OE-02 3.20E-02 1.20E-01 AP DEMO 36 L7432-03 2/17/2004 Ru-103 -7.00E-03 2.40E-02 I.OOE-01 AP DEMO 36 L7432-03 2/17/2004 Ru-106 -2.00E-03 5.20E-02 2.10E-0I AP DEMO 36 L7432-03 2/17/2004 Sb-124 0.OOE+00 3.SOE-02 1.60E-01 AP DEMO 36 L7432-03 2/17/2004 Sb-125 8.00E-03 1.20E-02 4.40E-02 AP DEMO 36 L7432-03 2/17/2004 Se-75 -6. 1OE-03 9.20E-03 3.60E-02 APDEMO 36 L7432-03 2/17/2004 Zn-65 -4.00E-03 1.30E-02 5.80E-02 AP DEMO 36 L7432-03 2/17/2004 Zr-95 2.70E-02 2.60E-02 9.40E-02 AP DEMO 36 L7756-01 4/14/2004 GROSS BETA 1.97E-02 1.80E-03 4.60E-03

• AP DEMO 36 L7756-05 4/21/2004 GROSS BETA 2.41E-02 2.40E-03 6.20E-03

• AP DEMO 36 L7757-02 4/28/2004 GROSS BETA 2.27E-02 2.20E-03 5.60E-03

• AP DEMO 36 L7757-04 5/5/2004 GROSS BETA 2.29E-02 2.30E-03 6.10E-03

• AP DEMO 36 L7759-01 5/12/2004 GROSS BETA 2.06E-02 2.70E-03 7.70E-03

• AP DEMO 36 L7759-04 5/19/2004 GROSS BETA 2.16E-02 2.50E-03 7.00E-03

• AP DEMO 36 L7759-09 5/26/2004 GROSS BETA 1.71E-02 2.20E-03 6.S0E-03

• AP DEMO 36 L7878-02 5/26/2004 AcTh-228 -1.20E-02 6.40E-03 2.80E-02 AP DEMO 36 L7878-02 5/26/2004 Ag-lOSm 1.70E-03 I.OOE-03 3.30E-03 AP DEMO 36 L7878-02 5/26/2004 Ag-I lim 2.80E-03 2.30E-03 8.OOE-03 AP DEMO 36 L7878-02 5/26/2004 Ba-140 3.10E-01 2.80E-01 9.70E-0I AP DEMO 36 L7878-02 5/26/2004 Bc-7 5.40E-02 4.70E-02 1.60E-01 AP DEMO 36 L7878-02 5/26/2004 Cc-141 8.00E-03 1.00E-02 3.SOE-02 AP DEMO 36 L7878-02 5/26/2004 Ce-144 3.40E-03 8.00E-03 2.80E-02 AP DEMO 36 L7878-02 5/26/2004 Co-57 -3.00E-05 9.20E-04 3.30E-03 AP DEMO 36 L7878-02 5/26/2004 Co-58 -1.00E-04 3.80E-03 I.SOE-02 AP DEMO 36 L7878-02 5/26/2004 Co-60 -4.OOE-04 I.SOE-03 6.60E-03 AP DEMO 36 L7878-02 5/26/2004 Cr-51 4.00E-02 l.OOE-01 3.60E-01 AP DEMO 36 L7878-02 5/26/2004 Cs-134 1.70E-03 I.50E-03 5.40E-03 AP DEMO 36 L7878-02 5/26/2004 Cs-137 1.IOE-03 3.00E-03 I.IOE-02 AP DEMO 36 L7878-02 5/26/2004 Fe-59 7.OOE-03 1.IOE-02 4.10E-02 AP DEMO 36 L7878-02 5/26/2004 1-131 4.20E+00 4.OOE+00 1.40E+01 AP DEMO 36 L7878-02 5/26/2004 K40 -5.OOE-02 2.1OE-02 I.OOE-01 AP DEMO 36 L7878-02 5/26/2004 La-140 3.60E-01 3.20E-01 1.IOE+00 AP DEMO 36 L7878-02 5/2612004 Mn-54 3.00E-03 1.70E-03 5.20E-03 AP DEMO 36 L7878-02 5/26/2004 Nb-95 -3.00E-03 1.lOE-02 4.20E-02 AP DEMO 36 L7878-02 5/26/2004 Ru-103 1.1 8E-02 7.80E-03 2.60E-02 AP DEMO 36 L7878-02 5/26/2004 Ru-106 -1.80E-02 1.40E-02 6.1OE-02 AP DEMO 36 L7878-02 5/26/2004 Sb-124 7.20E-03 9.80E-03 3.80E-02 AP DEMO 36 L7878-02 5/26/2004 Sb-125 1.20E-03 3.1OE-03 1.lOE-02 AP DEMO 36 L7878-02 5/26/2004 Se-75 -3.70E-03 2.70E-03 l.lOE-02 AP DEMO 36 L7878-02 5/26/2004 Zn-65 -5.30E-03 4.1OE-03 1.90E-02 AP DEMO 36 L7878-02 5/26/2004 Zr-95 -2.00E-03 7.40E-03 2.90E-02 AP DEMO 36 L7930-01 6/2/2004 AcTh-228 3.20E-03 5.70E-03 2.00E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-6

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCim3)

AP DEMO 36 L7930-01 6t2/2004 Ag-108m -2.20E-04 7.501E-04 2.60E-03 AP DEMO 36 L7930-01 6/2/2004 Ag-I 1om -5.60E-03 2.50E-03 9.30E3-03 AP DEMO 36 L7930-01 6/2/2004 Ba-140 4.70E+0I 9.0013+01 3.I1OE+02 AP DEMO 36 L7930-01 6/2/2004 Be-7 8.50E-02 9.6013-02 3.2013-01 AP DEMO 36 L7930-01 6/2/2004 Cc-141 -2.0013-02 6.90E-02 2.40E-01 AP DEMO 36 L7930-01 6/2/2004 Ce-144 -2.40E-03 5.8013-03 2.00E3-02 AP DEMO 36 L7930-01 6/2/2004 Co-57 -8.80E-04 7.2013-04 2.50E-03 AP DEMO 36 L7930-01 6/V2004 Co-s5 -8.30E-03 6.30E-03 2.30E-02 AP DEMO 36 L7930-01 6/2/2004 co-60 2.401E-03 1.30E3-03 4.20E-03 AP DEMO 36 L7930-01 6//2004 Cr-5 i -7.001E-01 I.IO01+00 3.9013+00 AP DEMO 36 L7930-01 6//2004 Cs-134 1.60E-03 1.30E-03 4.20E-03 AP DEMO 36 L7930-01 6/2/2004 Cs-137 -I .00E-04 1.1OE-03 3.7013-03 AP DEMO 36 L7930-01 6/2/2004 Fe-59 4.OOE-02 6.70E-02 2.3013-01 AP DEMO 36 L7930-01 6/2/2004 GROSS BETA 1.30E-02 2.4011-03 7.2013-03 AP DEMO 36 L7930-01 6/2/2004 1-131 -8.0013+03 4.50E+04 I1.50E+05 AP DEMO 36 L7930-01 6/2004 K-40 -8.00E-03 I1.90E-02 6.6013-02 AP DEMO 36 L7930-01 6/2/2004 La-140 5.OOE+01 I.001E+02 3.60E+02 AP DEMO 36 L7930-01 6/2/2004 Mn-54 -I1.40E3-03 I1.701E-03 5.9013-03 AP DEMO 36 L7930-01 6/V2004 Nb-9s -2.101E-02 5.60E3-02 1.9013-01 AP DEMO 36 L7930-01 6/2/2004 Ru-103 5.4013-02 3.2013-02 I.00E-01 AP DEMO 36 L7930-01 6/2/004 Ru-i06 0.OO1E+00 I1.401E-02 4.70E-02 AP DEMO 36 L7930-01 6/2/2004 Sb-124 I1.60E-02 2.50E-02 8.70E-02 AP DEMO 36 L7930-01 6/2/2004 Sb-125 6.0011-04 2.7013-03 9.3013-03 AP DEMO 36 L7930-01 6/2/2004 Se-75 -3.5013-03 3.2011-03 1.IOE-02 AP DEMO 36 L7930-01 6/2/2004 Zn-65 -9.50E-03 5.3011-03 2.0013-02 AP DEMO 36 L7930-01 6/2/2004 Zr-95 -4.0013-03 I1.50E-02 5.2013-02 AP DEMO 36 L7930-03 6/2/2004 AcThb22S 2.80E-03 3. IOE-03 I.001E-02 AP DEMO 36 L7930-03 6/2/2004 Ag-10Sm 4.7013-04 4. 1OE-04 1.4013-03 AP DEMO 36 L7930-03 6/2/2004 Ag-1o1m I.OOE-04 I1.30E-03 4.50OE-03 AP DEMO 36 L7930-03 6/2/2004 Ba-140 -3.70E+01 6.6013+01 2.30E3+02 AP DEMO 36 L7930-03 6/2/2004 Be-7 I1.50E3-02 6.00E3-02 2.0011-01 AP DEMO 36 L7930-03 6/2/2004 Cc-141 7.20E-02 6.30E-02 2. 1OE-0 I AP DEMO 36 L7930-03 6/2/2004 Cc-144 -7.20E-03 3.60E-03 1.20E3-02 AP DEMO 36 L7930-03 6/2/2004 Co-57 9.90E-04 4.60E-04 1.50E-03 AP DEMO 36 L7930-03 6/2/2004 Co-58 5.30E-03 4. 1OE-03 I1.40E3-02 AP DEMO 36 L7930-03 6Q/!2004 Co-60 3.1 6E-03 6.60E-04 2.701E-03 AP DEMO 36 L7930-03 6/2/2004 Cr-51 -9.40E-01I 7.5013-01 2.6013+00 AP DEMO 36 L7930-03 6/2/2004 Cs-134 -4.2013-04 7.501E-04 2.60E-03 AP DEMO 36 L7930-03 6/2/2004 Cs-137 2.8013-04 5.50E3-04 1.80E-03 AP DEMO 36 L7930-03 6/2/2004 Fe-59 3.40E-02 3.70E3-02 I1.20E-01 AP DEMO 36 L7930-03 6/2/2004 GROSS BETA I1.64E3-02 2.20E-03 6.40E-03 AP DEMO 36 L7930-03 6/2/2004 1-131 -4.50E+04 4.701E+04 1.60E+05 AP DEMO 36 L7930-03 6Q/2/004 K-40 -5.0011-03 1.IOE-02 3.7013-02 AP DEMO 36 L7930-03 6/2/2004 IA-140 -4.30E+01 7.60E+01 2.6013+02 AP DEMO 36 L7930-03 6/2/2004 Mn-54 1.3013-04 9.OOE-04 3.001E-03

• Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-7

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCitm3)

APDEMO 36 L7930-03 6/2/2004 Nb-95 -1.17E-0I 5.40E-02 1.90E-01 APDEMO 36 L7930-03 612/2004 Ru-103 -4.OOE-03 2.2011-02 7.4011-02 AP DEMO 36 L7930-03 61212004 Ru-106 -2. 1OE-03 7.70E-03 2.60E-02 APDEMO 36 L7930-03 6/212004 Sb-124 6.OOE-03 1.50E-02 5.20E-02 APDEMO 36 L7930-03 612/2004 Sb-125 2.OOE-03 I1.50E3-03 5.00E-03 APDEMO 36 L7930-03 6/2/2004 Se-75 O.OOE+O0 I1.80E-03 6.20E-03 APDEMO 36 L7930-03 6/2/2004 Zn-65 -2.40E-03 2.4013-03 8.30E-03 AP DEMO 36 L7930-03 6/2/2004 Zr-95 4.20E-03 9.50E-03 3.20E-02 AP DEMO 36 L7930-07 6/&82004 AcTh-228 -6.90E-03 4.50E-03 2.00E-02 AP DEMO 36 L7930-07 6//2004 Ag-lOSm -1.25E-03 6.70E-04 2.3011-03 AP DEMO 36 L7930-07 6/2004 Ag-l lOm 8.OOE-04 I1.90E-03 6.30E-03 AP DEMO 36 L7930-07 6/812004 Ba-140 6.80E+01 5.30E+01 1.80E+02 AP DEMO 36 L7930-07 6/8/2004 Be-7 1.70E-01 7.90E-02 2.601E-01 APDEMO 36 L7930-07 6/8/2004 Ce-141 5.30E-02 5.3013-02 I1.7013-01 APDEMO 36 L7930-07 6/8/2004 Ce-144 -1.06E-02 5.OOE-03 1.70E-02 AP DEMO 36 L7930-07 6/8/2004 Co-57 1.OIE-03 8.40E-04 2.8SOE-03 AP DEMO 36 L7930-07 6/&82004 Co-58 -1.67E-02 5.50E-03 2.0011-02 AP DEMO 36 L7930-07 6/&82004 Co-60 3.00E-04 1. IOE-03 3.6013-03 AP DEMO 36 L7930-07 6/8/2004 Cr-51 -2.07E+00 8.70E-01 3.0013+00 AP DEMO 36 L7930-07 6/8/2004 Cs-134 1.20E-03 I .OOE-03 3.40E-03 AP DEMO 36 L7930-07 6/812004 Cs-137 -5.40E-04 8.90E-04 3. IOE-03 AP DEMO 36 L7930-07 6/8/2004 Fe-59 3.60E-02 4.80E-02 1.60E-01 AP DEMO 36 L7930-07 6/8/2004 GROSS BETA 1.50E-02 2.80E-03 8.30E-03 AP DEMO 36 L7930-07 6//2004 1-131 4.OOE+03 2.50E+04 8.30E+04 AP DEMO 36 L7930-07 6/8/2004 K-40 1.20E-02 I1.60E-02 5.40E-02 AP DEMO 36 L7930-07 6/8/2004 La-140 7.90E+01 6.10E+01 2.0013+02 AP DEMO 36 L7930-07 6/8/2004 Mn-54 -2.30E-03 I1.30E-03 4.50E-03 AP DEMO 36 L7930-07 6/8/2004 Nb-95 7.90E-02 4.20E-02 1.40E-01 AP DEMO 36 L7930-07 6/8/2004 Ru-103 1. lOE-02 2.301E-02 7.6013-02 AP DEMO 36 L7930-07 6/2004 Ru-106 -1.SOE-02 I1.201E-02 4.OOE-02 AP DEMO 36 L7930-07 6/8/2004 Sb-124 1.IOE-02 2. IO-02 7.OOE-02 AP DEMO 36 L7930-07 6/8/2004 Sb-125 2.90E-03 2.30E-03 7.60E-03 AP DEMO 36 L7930-07 6/8/2004 Se-75 I.OOE-04 2.40E-03 8.OOE-03 AP DEMO 36 L7930-07 6/8/2004 Zn-65 -8.SOE-03 3.60E-03 1.30E-02 AP DEMO 36 L7930-07 618/2004 Zr-95 1.00E-03 1.20E-02 4. IOE-02 AP DEMO 36 L7931-04 6/16/2004 AcTh-22S -1.80E-03 5.OOE-03 I1.701E-02 APDEMO 36 L7931-04 6/16/2004 Ag-lOSm 1.90E-04 7.20E-04 2.5013-03 AP DEMO 36 L7931-04 6/16/2004 Ag-lOnm -2.50E-03 2.3013-03 8.30E-03 APDEMO 36 L7931-04 6/16/2004 Ba-140 -2.20E+01 3.80E+01 I1.40E+02 AP DEMO 36 L7931-04 6/16/2004 Be-7 9.00E-03 7.80E-02 2.70E3-01 AP DEMO 36 L7931-04 6/16/2004 Ce-141 6.70E-02 5.60E-02 1.801E-01 AP DEMO 36 L7931-04 6/16/2004 Ce-144 7.50E-03 4.90E-03 I1.60E3-02 AP DEMO 36 L7931-04 6/16/2004 Co-57 -9.OOE-05 6.3013-04 2. IOE.03 AP DEMO 36 L7931-04 6/16/2004 Co-58 -1.l1OE-03 6.30E-03 2.201E-02 AP DEMO 36 L7931-04 6/16/2004 Co-60 1.80E-03 I1.30E-03 4.20E1-03 AP DEMO 36 L7931-04 6/16/2004 Cr-51 I.OOE-01 6.30E-01I 2.201E+00

• Radioactivity detected In sample (ie., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-8

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m)

AP DEMO 36 L7931-04 6/16/2004 Cs-134 8.OOE-04 1.20E-03 4.20E-03 AP DEMO 36 L793 1-04 6/16/2004 Cs-137 -4.40E-04 8.90E-04 3.20E-03 AP DEMO 36 L7931-04 6/16/2004 Fe-59 I1.50E-02 4.80E-02 1.70E-01 APDEMO 36 L793 1-04 6116/2004 GROSS BETA I1.88E-02 2.00E-03 5.30E-03 APDEMO 36 L793 1-04 6/16/2004 1-131 -1.80E+04 1.I0E+04 4.00E+04 APDEMO 36 L793 1-04 6/16/2004 K40 5.OOE-03 1.90E-02 6.40E-02 APDEMO 36 L793 1-04 6/16/2004 La-140 -2.50E+01 4.40E+01 1.60E+02 APDEMO 36 L793 1-04 6/16/2004 Mn-54 5.OOE-04 1.50E-03 5.OOE-03 APDEMO 36 L793 1-04 6/16/2004 Nb-95 -5.30E-02 4.40E-02 1.60E-OI AP DEMO 36 L7931-04 6/16/2004 Ru-103 -8.OOE-03 2.30E-02 8.00E-02 AP DEMO 36 L793 1-04 6/16/2004 Ru-106 4.OOE-03 1.IOE-02 3.90E-02 AP DEMO 36 L793 1-04 6/16/2004 Sb-124 8.OOE-03 2.30E-02 8.00E-02 AP DEMO 36 L793 1-04 6/16/2004 Sb-125 I.OOE-04 2.60E-03 8.80E-03 AP DEMO 36 L793 1-04 6/16/2004 Se-75 -4.80E-03 2.30E-03 8.20E-03 APDEMO 36 L7931-04 6/16/2004 Zn-65 3.10OE-03 4.OOE-03 1.40E-02 AP DEMO 36 L7931-04 6/16/2004 Zr-95 2.001E-03 1.30E-02 4.50E-02 AP DEMO 36 L7931-07 6/23/2004 Acd'1-228 8.20E-03 4.SOE-03 I.50E-02 APDEMO 36 L7931-07 6/23/2004 Ag-108m I1.27E-03 6.50E-04 2. 10E-03 AP DEMO 36 L793 1-07 6/23/2004 Ag-110m -2.90E-03 1.80E-03 6.50E-03 AP DEMO 36 L7931-07 6/23/2004 Ba-140 8.OOE+00 2.10E+0I 7.30E+01 AP DEMO 36 L7931-07 623/2004 Be-7 9.40E-02 6.60E-02 2.20E-01 APDEMO 36 L7931-07 6/23/2004 Ce-141 3.OOE-02 4.90E-02 1.60E-01 AP DEMO 36 L793 1-07 6/23/2004 Ce-144 I1.40E-03 4.70E-03 1.60E-02 APDEMO 36 L793 1-07 6/23/2004 Co-57 -5.80E-04 6.20E-04 2. 1OE-03 AP DEMO 36 L793 1-07 6/23/2004 Co-5S 4.20E-03 4.40E-03 I.50E-02 AP DEMO 36 L7931-07 6/23/2004 Co-60 I.00E-04 I .OOE-03 3.60E-03 AP DEMO 36 L793 1-07 6/23/2004 Cr-51 3.70E3-01 6.OOE-01 2.OOE+00 APDEMO 36 L793 1-07 6/23/2004 Cs-134 -1.00E-03 l.OOE-03 3.60E-03 APDEMO 36 L793 1-07 6/23/2004 Cs-137 8.00E-05 8.60E-04 2.90E-03 APDEMO 36 L7931-07 6/23/2004 Fe-59 0.00E+00 3.90E-02 1.40E-01 AP DEMO 36 L793 1-07 6/23/2004 GROSS BETA 2.0.4E-02 2.30E-03 6.10E-03 AP DEMO 36 L793 1-07 6/23/2004 1-131 I1.2013+04 6.30E+03 2.1 OE+04 AP DEMO 36 L793 1-07 6/23/2004 K40 I1.50E-02 I.50E-02 5.IOE-02 AP DEMO 36 L7931-07 6/23/2004 La-140 9.OOE+00 2.40E+01 8.40E+0I AP DEMO 36 L7931-07 6/23/2004 Mn-54 -4.OOE-04 1.20E-03 4. 1OE-03 AP DEMO 36 L7931-07 6/23/2004 Nb-95 5.OOE-03 3.1OE-02 I. IOE-0I AP DEMO 36 L7931-07 6/23/2004 Ru-103 -5.OOE-03 1.70E-02 5.90E-02 AP DEMO 36 L793 1-07 6/23/2004 Ru-106 -1.60E-02 1.IOE-02 3.70E-02 AP DEMO 36 L793 1-07 6/23/2004 Sb-124 3.20E-02 1.80E-02 6.00E-02 AP DEMO 36 L793 1-07 6/23/2004 Sb-125 3.OOE-04 2.20E-03 7.40E-03 APDEMO 36 L793 1-07 6/23/2004 Se-75 -2.OOE-04 2.20E-03 7.30E-03 AP DEMO 36 L793 1-07 6/23/2004 Zn-65 -1.OIE-02 3.30E-03 1.20E-02 APDEMO 36 L7931-07 6/23/2004 Zr-95 -4.OOE-03 I.00E-02 3.50E-02 AP DEMO 36 L7939-02 6/30/2004 Ac'1h-228 -1.90E-03 3.70E-03 1.20E-02 AP DEMO 36 L7939-02 6/30/2004 Ag-lOSm -2.OOE-05 3.60E-04 1.20E-03 APDEMO 36 L7939-02 6/30/2004 Ag- li0m -1.50E-03 1.20E-03 4.OOE-03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-9

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC W- TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L7939-02 6/30/2004 Ba-140 -1.40E+01 1.SOE+0O 5.IOE+OI AP DEMO 36 L7939-02 6/30/2004 Be-7 1.23E-01 5.80E-02 1.90E-0I AP DEMO 36 L7939-02 6/30/2004 Cc-141 -7.50E-02 3.60E-02 1.20E-0O AP DEMO 36 L7939-02 6/30/2004 Ce-144 -3.30E-03 2.40E-03 8.20E-03 AP DEMO 36 L7939-02 6130/2004 Co-57 1.IOE-04 3.1 OE-04 I.OOE-03 AP DEMO 36 L7939-02 6/30/2004 Co-58 -2.5013-03 2.70E-03 9.20E-03 AP DEMO 36 L7939-02 6/30/2004 Co-60 4.44E-03 6.OOE-04 2.60E-03 AP DEMO 36 L7939-02 6/30/2004 Cr-SI I.0013-02 3.30E-01 1.IOE+00 AP DEMO 36 L7939-02 6/30/2004 Cs-134 1.70E-03 6. 1OE-04 2.00E-03 AP DEMO 36 L7939-02 6/30/2004 Cs-137 9.90F-04 S.90E-04 I.90E-03 AP DEMO 36 L7939-02 6/30/2004 Fe-59 -3.1013-02 2.SOE-02 8.60E-02 AP DEMO 36 L7939-02 6/30/2004 GROSS BETA 2.281-02 2.60E-03 6.90E-03 AP DEMO 36 L7939-02 6/30/2004 1-131 -5.10E+03 3.80E+03 1.30E+04 AP DEMO 36 L7939-02 6/30/2004 K-40 9.OOE-03 1.30E-02 4.40E-02 AP DEMO 36 L7939-02 6/30/2004 La-140 -1 .60E+01 1.70E+01 5.90E+O1 AP DEMO 36 L7939-02 6/30/2004 Mn-54 1.67E-03 7.20E-04 2.30E-03 AP DEMO 36 L7939-02 6/30/2004 Nb-95 4.30E-02 I.90E-02 6.1OE-02 AP DEMO 36 L7939-02 6/30/2004 Ru-103 -1. IOE-02 1.OOE-02 3.SOE-02 AP DEMO 36 L7939-02 6/30/2004 Ru-106 -9.70E-03 6.40E-03 2.20E-02 AP DEMO 36 L7939-02 6/30/2004 Sb-124 1.60E-02 1.IOE-02 3.70E-02 AP DEMO 36 L7939-02 6/30/2004 Sb-125 -2.OOE-04 1.20E-03 4.20E-03 AP DEMO 36 L7939-02 6/30/2004 Se-75 9.OOE-04 1.IOE-03 3.80E-03 AP DEMO 36 L7939-02 6/30/2004 Zn-65 -2.0013-04 1.80E-03 6.20E-03 AP DEMO 36 L7939-02 6/30/2004 Zr-95 -6.90E-03 S.70E-03 2.OOE-02 AP DEMO 36 L7939-06 7n/2004 AcTh-228 -5.6013-03 5.40E-03 1.90E-02 AP DEMO 36 L7939-06 7n/2004 Ag-OSim -7.80E-04 8.103E-04 2.90E-03 AP DEMO 36 L7939-06 7n/2004 Ag-llbm -4.OOE-04 2.60E-03 9.20E-03 AP DEMO 36 L7939-06 7/2004 Ba-140 -1.30E+01 1.SOE+OI 5.70E+O1 AP DEMO 36 L7939-06 7n/2004 Bc-7 -1.70E-02 6.90E-02 2.40E-O1 AP DEMO 36 L7939-06 77n2004 Cc-141 8.70E-02 3.50E-02 l. IOE-0I AP DEMO 36 L7939-06 7no2004 Ce-144 -4.OOE-03 5.60E-03 l.90E-02 AP DEMO 36 L7939-06 7/7/2004 Co-57 2.3013-04 7.00E-04 2.40E-03 AP DEMO 36 L7939-06 7/7/2004 Co-58 -3.90E-03 S.70E-03 2.00E-02 AP DEMO 36 L7939-06 77n/2004 Co-60 2.OOE-03 I.SOE-03 4.90E-03 AP DEMO 36 L7939-06 7/7/2004 Cr-51 -3.101E-O1 4.40E-0O I.SOE+O0 AP DEMO 36 L7939-06 7n/2oo4 Cs-134 I1.80E-03 1.60E-03 S.40E-03 AP DEMO 36 L7939-06 7/7/2004 Cs-137 -1.OE-03 I .IOE-03 4. IOE-03 AP DEMO 36 L7939-06 7/7/2004 Fc-59 -3.OOE-02 4.30E-02 1.60E-0O AP DEMO 36 L7939-06 7n72004 GROSS BETA 1.8313-02 2.30E-03 6.40E-03 AP DEMO 36 L7939-06 7n72004 1-131 -2.60E+03 2.40E+03 8.30E+03 AP DEMO 36 L7939-06 7/7/2004 K-40 -1.80E-02 2.OOE-02 7.20E-02 AP DEMO 36 L7939-06 7n/2004 La-140 -1 .5OE+01 1.70E+OI 6.SOE+OI AP DEMO 36 L7939-06 7/7/2004 Mn-54 -2.7013-03 1.70E-03 6.40E-03 AP DEMO 36 L7939-06 7n72004 Nb-95 2.9013-02 3.30E-02 1.I OE-0 I AP DEMO 36 L7939-06 7n/2004 Ru-103 -2.10E-02 I.90E-02 6.80E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-10

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCilm3) (pCilm3)

AP DEMO 36 L7939-06 7/72004 Ru-106 -7.OOE-03 1.30E-02 4.40E-02 AP DEMO 36 L7939-06 7m72004 Sb-124 -2.00E-02 2.20E-02 8.30E-02 AP DEMO 36 L7939-06 7m/2004 Sb-125 5.OOE-04 3.00E-03 1.001E-02 AP DEMO 36 L7939-06 717/2004 Se-75 2.20E-03 2.50E-03 8.40E-03 AP DEMO 36 L7939-06 7/7/2004 Zn-65 -9.90E-03 4. iOE-03 1.60E-02 AP DEMO 36 L7939-06 7/7/2004 Zr-95 2.00E-02 1.20E-02 3.80E-02 AP DEMO 36 L7940-02 7/13/2004 AcTh-228 -6. 1OE-03 6.80E-03 2.40E-02 AP DEMO 36 L7940-02 7/13/2004 Ag-108m -9.OOE-05 9.20E-04 3.1OE-03 AP DEMO 36 L7940-02 711312004 Ag-l lomn O.OOE+00 2.70E-03 9.30E-03 AP DEMO 36 L7940-02 7/13/2004 Ba-140 1.30E+01 1.20E+01 3.90E+01 AP DEMO 36 L7940-02 7/13/2004 Be-7 I.1OE-02 7.30E-02 2.50E-01 AP DEMO 36 L7940-02 7/13/2004 Ce-141 -3.40E-02 3.30E-02 1.IOE-01 AP DEMO 36 L7940-02 7/13/2004 Ce-144 -2.00E-03 6.30E-03 2.10E-02 AP DEMO 36 L7940-02 7/13/2004 Co-57 -L.00E-03 7.90E-04 2.70E-03 AP DEMO 36 L7940-02 7/13/2004 Co-58 -9.60E-03 5.90E-03 2.1OE-02 AP DEMO 36 L7940-02 7/13/2004 Co-60 -1.00E-04 1.60E-03 s.70E-03 AP DEMO 36 L7940-02 7/13/2004 Cr-51 2.00E-02 5.20E-01 1.80E+00 AP DEMO 36 L7940-02 7/13/2004 Cs-134 L.00E-04 1.SOE-03 5.OOE-03 AP DEMO 36 L7940-02 7113/2004 Cs-137 1.SOE-03 1.30E-03 4.30E-03 AP DEMO 36 L7940-02 7/13/2004 Fe-59 -4.20E-02 4.70E-02 1.70E-01 AP DEMO 36 L7940-02 7/13/2004 GROSS BETA 2.57E-02 2.70E-03 7.OOE-03 AP DEMO 36 L7940-02 7/13/2004 1-131 1.60E+03 1.70E+03 5.70E+03 AP DEMO 36 L7940-02 7/13/2004 K-40 -1.90E-02 2.40E-02 8.30E-02 AP DEMO 36 L7940-02 7/13/2004 La-140 1.50E+01 1.30E+01 4.50E+01 AP DEMO 36 L7940-02 7/13/2004 Mn-54 1.70E-03 1.90E-03 6.20E-03 AP DEMO 36 L7940-02 7/13/2004 Nb-95 O.OOE+00 2.soE-02 9.80E-02 AP DEMO 36 L7940-02 7/13/2004 Ru-103 -2.70E-02 1.soE-02 6.SOE-02 AP DEMO 36 L7940-02 7/13/2004 Ru-106 .OOE-03 1.60E-02 S.40E-02 AP DEMO 36 L7940-02 7113/2004 Sb-124 3.10E-02 2.10E-02 7.00E-02 AP DEMO 36 L7940-02 7/13/2004 Sb-125 -S.40E-03 3.20E-03 1.1OE-02 AP DEMO 36 L7940-02 7/13/2004 Se-75 1.50E-03 3.20E-03 1.IOE-02 AP DEMO 36 L7940-02 7/13/2004 Zn-65 1.60E-03 4.40E-03 L.50E-02 AP DEMO 36 L7940-02 7/13/2004 Zr-95 1.30E-02 1.20E-02 4.00E-02 AP DEMO 36 L7940-05 7/20/2004 Acil-228 -1.30E-03 4.40E-03 1.50E-02 AP DEMO 36 L7940-05 7/20/2004 Ag-108m -1.57E-03 7.10E-04 2.SOE-03 AP DEMO 36 L7940-05 7/20/2004 Ag-1 lOm -1.20E-03 2.OOE-03 6.80E-03 AP DEMO 36 L7940-05 7/20/2004 Ba-140 4.70E+00 5.70E+00 1.90E+01 AP DEMO 36 L7940-05 7/20/2004 Bc-7 9.OOE-03 5.70E-02 1.90E-01 AP DEMO 36 L7940-05 7/20/2004 Ce-141 -4.20E-02 2.80E-02 9.70E-02 AP DEMO 36 L7940-05 7/20/2004 Ce-144 -7.00E-03 4.soE-03 1.70E-02 AP DEMO 36 L7940-05 7/20/2004 Co-57 9.OOE-05 6.00E-04 2.00E-03 AP DEMO 36 L7940-05 7/20/2004 Co-58 -1 .20E-03 4.30E-03 1.soE-02 AP DEMO 36 L7940-05 7/20/2004 Co-60 -2.00E-04 1.IOE-03 3.70E-03 AP DEMO 36 L7940-05 7/20/2004 Cr-51 2.80E-01 3.20E-01 1.IOE+00 AP DEMO 36 L7940-05 7/20/2004 Cs-134 4.OOE-04 1.30E-03 4.soE-03 AP DEMO 36 L7940-05 7/20/2004 Cs-137 -9.OOE-05 9.20E-04 3.20E-03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-I I

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L7940-05 7/20/2004 Fe-59 7.0013-03 2.80E-02 9.70E-02 AP DEMO 36 L7940-05 7/20/2004 GROSS BETA I1.86E-02 2.20E-03 5.90E-03 AP DEMO 36 L7940-05 7/20/2004 1-131 -6. 101+02 7.00E+02 2.40E+03 AP DEMO 36 L7940-05 7/20/2004 K-40 0.00E+00 1.60E-02 5.50E-02 AP DEMO 36 L7940-05 7/20/2004 La-140 5.40E+00 6.50E+00 2.20E+01 AP DEMO 36 L7940-05 7/20/2004 Mn-54 -8.00E-04 1.30E-03 4.70E-03 AP DEMO 36 L7940-05 7/20/2004 Nb-95 -I. IOE-02 2. 1OE-02 7.40E-02 AP DEMO 36 L7940-05 7/20/2004 Ru-103 -4.OOE-03 1.30E-02 4.30E-02 AP DEMO 36 L7940-05 7/20/2004 Ru-106 1.001E-03 1.20E-02 4.0013-02 AP DEMO 36 L7940-05 7/20/2004 Sb-124 7.OOE-03 1.30E-02 4.601E-02 AP DEMO 36 L7940-05 7/20/2004 Sb-125 2.001E-04 2.20E-03 8.0013-03 AP DEMO 36 L7940-05 7/20/2004 Se-75 7.OOE-04 2.20E-03 7.30E-03 AP DEMO 36 L7940-05 7/20/2004 Zn-65 -1.00E-04 3.30E-03 1.I OE-02 AP DEMO 36 L7940-05 7/20/2004 Zr-95 -4.IOE-03 8.70E-03 3.OOE-02 AP DEMO 36 L7941-01 7/27/2004 AcTh-228 4.50E-03 6.SOE-03 2.20E-02 AP DEMO 36 L7941-01 7/27/2004 Ag-108m -1 .40E-04 9.SOE-04 3.30E-03 AP DEMO 36 L7941-01 7/27/2004 Ag-110m -I1.20E-03 2.70E-03 9.601E-03 AP DEMO 36 L7941-01 7/27/2oo4 Ba-140 -7.OOE-01 7.60E+00 2.701E+01 AP DEMO 36 L7941-01 7/27/2oo4 Be-7 -2.30E-02 6.80E-02 2.30E-01 AP DEMO 36 L7941-01 7/27/2004 Ce-141 -3.70E-02 3.40E-02 1.20E-01 AP DEMO 36 L794 1.-01 7/272004 Ce-144 9.00E3-04 6.50E-03 2.20E-02 AP DEMO 36 L794 1-01 727/2004 Co-57 9.30E-04 8.10E-04 2.701E-03 AP DEMO 36 L7941 -01 7/27/2004 Co-58 -4.0013-03 5.30E-03 I1.9013-02 AP DEMO 36 L7941-01 7/27/2004 Co-60 4.40E-03 1.70E-03 5.50E-03 AP DEMO 36 L7941-01 7/27/2004 Cr-51 I .00E-01 4.30E-0I 1.40E+00 AP DEMO 36 L7941-01 7/27/2004 Cs-134 -1 .40E-03 2.00E-03 7. 10OE-03 AP DEMO 36 L7941-01 7/27/2004 Cs-137 2.501E-03 1.30E-03 4.40E-03 AP DEMO 36 L7941-01 7/27/2004 Fe-59 I1.60E-02 4.20E-02 1.40E-01 AP DEMO 36 L7941-01 7/27/2004 GROSS BETA 2.25E-02 2.70E-03 7.40E-03 AP DEMO 36 L7941-01 7/27/2004 1-131 0.00E+00 8.60E+02 2.90E+03 AP DEMO 36 L7941-01 7/27/2004 K-40 -2.OOE-03 2.30E-02 8.00E-02 AP DEMO 36 L7941-01 7/27/2004 La-140 -8.OOE-01 8.70E+00 3. IOE+0 I AP DEMO 36 L7941-01 7/27/2004 Mn-54 1.1I OE-03 I.90E-03 6.50E-03 AP DEMO 36 L794 1.01 7/27/2004 Nb-95 -5.0013-03 2.60E-02 9.OOE-02 AP DEMO 36 L794 1.-01 7/27/2004 Ru-103 -6.00O3-03 1.70E-02 5.90E-02 AP DEMO 36 L7941-01 7/27/2004 Ru-106 I.OOE-03 I.SOE-02 5.20E-02 AP DEMO 36 L7941-01 7/27/2004 Sb-124 -1.OOE-02 1.80E-02 6.7013-02 AP DEMO 36 L7941-01 7/27/2004 Sb-125 -9.OOE-04 3.30E-03 1.I OE-02 AP DEMO 36 L7941-01 7/27/2004 Se-75 -3.50E-03 3.OOE-03 1.00E-02 AP DEMO 36 L794 I1-01 7/27/2004 Zn-65 1.60E-02 8.OOE-03 2.60E-02 AP DEMO 36 L7941-01 7/27/2004 Zr-95 8.00E-03 I.OOE-02 3.40E-02 AP DEMO 36 L7941-05 8/4/2004 AcTh-228 6.80E-03 3.40E-03 1.30E-02 AP DEMO 36 L7941 -05 8/4/2004 Ag-108m 5.7013-04 4.40E-04 I1.40E-03 AP DEMO 36 L7941-05 8/4/2004 Ag-110m 0.001E+00 1.20E-03 4.201E-03 AP DEMO 36 L7941-05 8/4/2004 Ba-140 - 1.1I OE+00 2.40E+00 8.501E+00 AP DEMO 36 L7941-05 8/4/2004 Bc-7 I1.50E-02 2.80E-02 9.50E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-12

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L7941-05 8/4/2004 Ce-141 2.40E-02 I1.70E-02 5.60E-02 AP DEMO 36 L7941-05 8/4/2004 Ce-144 -1.OO-04 2.7013-03 9.2013-03 APDEMO 36 L7941-05 8/4(2004 Co-57 4.3013-04 3.4013-04 1.IOE-03 AP DEMO 36 L7941-05 8/4/2004 Co-58 4.OOE-04 2.50E-03 8.40E-03 AP DEMO 36 L7941-05 8/4/2004 Co-60 I1.2613-03 7.90E-04 2.60E-03 AP DEMO 36 L7941-05 8/4/2004 Cr-51 I. IOE-01 1.40E-01 4.60E-01 AP DEMO 36 L7941-05 8/4/2004 Cs-134 7.OOE-05 7.40E-04 2.50E-03 AP DEMO 36 L7941-05 8/4/2004 Cs-137 6.70E-04 5.70E-04 I1.90E-03 AP DEMO 36 L7941-05 8/4/2004 Fe-59 I1.30E-02 I1.60E-02 5.30E-02 APDEMO 36 L7941-05 8/4/2004 GROSS BETA 2.27E-02 2.20E-03 5.80E-03 AP DEMO 36 L7941-05 814/2004 1-131 -3.IOE1+02 2.001E+02 6.70E+02 AP DEMO 36 L7941-05 8/4/2004 K-40 1.90E-02 I1.40E-02 4.6013-02 AP DEMO 36 L7941-05 8/4/2004 IA-140 -1 .30E+O0 2.80E+00 9.70E+00 AP DEMO 36 L7941-05 8/4/2004 Mn-54 -7.80E-04 8.40E-04 2.9013-03 AP DEMO 36 L7941-05 8/4/2004 Nb-95 -1.OO-03 1.20E-02 4.10E-02 AP DEMO 36 L7941-05 8/4/2004 Ru-103 3.70E-03 6.70E-03 2.20E-02 AP DEMO 36 L7941-05 814/2004 Ru-106 3.70E-03 6.30E-03 2.10OE-02 AP DEMO 36 L7941-05 8/4/2004 Sb-124 -1.07E-02 8.60E-03 3.10OE-02 AP DEMO 36 L7941-05 8/4/2004 Sb-125 3.IOE-03 I1.50E-03 4.70E-03 APDEMO 36 L7941-05 8/4/2004 Se-75 1.00E-04 1.IOE-03 3.70E-03 APDEMO 36 L7941-05 8/4/2004 Zn-65 3.OOE-03 2.OOE-03 6.60E-03 AP DEMO 36 L7941-05 8/4/2004 Zr-95 1.IOE-03 5.OOE-03 1.70E-02 AP DEMO 36 L8361-01 8/10/2004 AcTh-229 8.90E-03 3.80E-03 I1.80E-02 APDEMO 36 L8361-01 8/10/2004 Ag-108m -3.70E-04 5.40E-04 1.80E-03 AP DEMO 36 L8361-01 8/10/2004 Ag-110rn 0.OOE+00 1.50E-03 5.0011-03 AP DEMO 36 L8361-01 8/10/2004 Ba-140 -5.0013-01 2.30E+00 7.80E+00 AP DEMO 36 L8361-01 8/10/2004 Be-7 6.50E-02 3.30E-02 1.IOE-0 1 AP DEMO 36 L8361-01 8/10/2004 Cc-141 2.0011-03 2.10OE-02 7.I1OE-02 AP DEMO 36 L8361-01 8/10/2004 Ce-144 6.OOE-04 3.50E-03 I1.20E-02 AP DEMO 36 L8361-01 8/10/2004 Co-57 I.OOE-05 4.40E-04 I1.50E-03 AP DEMO 36 L8361-01 8/10/2004 Co-58 5. IOE-03 2.6013-03 8.50E-03 AP DEMO 36 L8361-01 8/10/2004 Co-60 1.04E-03 9.30E-04 3.10OE-03 AP DEMO 36 L8361-01 8/10/2004 Cr-51 1.70E-01 I1.70E-01 5.70E-01 AP DEMO 36 L8361-01 8/10/2004 Cs-134 I1.05E-03 8.40E-04 2.8013-03 AP DEMO 36 L8361-01 8/10/2004 Cs-137 1.1I 2E-03 7.70E-04 2.50E-03 AP DEMO 36 L8361-01 8/10/2004 Fe-59 -8.00E-03 I1.90E-02 6.30E-02 AP DEMO 36 L8361-01 8/10/2004 GROSS BEIA 2.74E-02 3.40E-03 9.30E-03 AP DEMO 36 L8361-01 8/10/2004 1-131 7.OOE+01 I1.60E+02 5.30E+02 AP DEMO 36 L8361-01 8/10/2004 K40 -5.OOE-03 1.90E-02 6.40E-02 AP DEMO 36 L8361-01 8/10/2004 La-140 -6.00E3-01 2.60E+00 8.90E+00 APDEMO 36 L8361-01 8/10/2004 Mn-54 -8.30E-04 9.80E-04 3.30E-03 AP DEMO 36 L8361-01 8/10/2004 Nb-95 5. 1OE-02 I1.70E-02 5.6013-02 AP DEMO 36 L8361-01 8/10/2004 Ru-103 2.90E-03 7.50E-03 2.5013-02 AP DEMO 36 L8361-01 8/10/2004 Ru-106 -1.40E-02 I1.40E-02 4.6013-02 AP DEMO 36 L8361-01 8/10/2004 Sb-124 -3.OOE-03 9.20E-03 3.20E-02 AP DEMO 36 L8361-01 8/10/2004 Sb-125 -6.00E-04 I.80E-03 6. IOE-03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-13

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L8361-01 8/10/2004 Se-75 -2.OOE-04 1.60E-03 5.30E-03 AP DEMO 36 L8361-01 8/10/2004 Zn-65 1.70E-03 2.20E-03 7.SOE-03 AP DEMO 36 L8361-01 8/10/2004 Zr-95 -3.20E-03 5.40E-03 1.80E-02 AP DEMO 36 18252-03 8/18/2004 Acl1h-228 2.40E-03 5.30E-03 1.80E-02 AP DEMO 36 L8252-03 8/1812004 Ag-108m 2.1 OE-04 6.60E-04 2.20E-03 AP DEMO 36 L8252-03 8/18/2004 Ag-i lOm -4.00E-04 1.90E-03 6.60E-03 AP DEMO 36 L8252-03 8/1812004 Ba-140 - 1.40E+00 1.60E+00 6.20E+00 AP DEMO 36 L8252-03 8/18/2004 Be-7 8.00E-02 3.80E-02 1.20E-0I AP DEMO 36 L8252-03 8/18/2004 Ce-141 -1.20E-02 I.90E-02 6.40E-02 AP DEMO 36 L8252-03 8118/2004 Ce-144 1.70E-03 4.20E-03 1.40E-02 AP DEMO 36 L8252-03 8/18/2004 Co-57 -6.00E-04 5. IOE-04 1.80E-03 AP DEMO 36 L8252-03 8/1812004 Co-58 -1.70E-03 3.00E-03 1.IOE-02 AP DEMO 36 L8252-03 8/18/2004 Co-60 4.00E-04 1.30E-03 4.40E-03 AP DEMO 36 L8252-03 8/18/2004 Cr-SI 2.80E-01 1.70E-01 5.70E-01 AP DEMO 36 L8252-03 8/1812004 Cs-134 -1.70E-03 1.IOE-03 4.00E-03 AP DEMO 36 L8252-03 8/1812004 Cs-137 I.OOE-04 I.OOE-03 3.50E-03 AP DEMO 36 L8252-03 8/18/2004 Fe-59 2.20E-02 2. 1OE-02 7.20E-02 AP DEMO 36 L8252-03 8118/2004 GROSS BETA 2. 15E-02 2. 1OE-03 5.40E-03 AP DEMO 36 Ls252-03 8/18/2004 1-131 1.06E+02 8.80E+0I 2.90E+02 AP DEMO 36 18252-03 8/1812004 K-40 5.OOE-03 1.70E-02 5.90E-02 AP DEMO 36 L8252-03 8/1812004 La-140 -1.60E+00 1.90E+00 7.10E+00 AP DEMO 36 18252-03 8/1812004 Mn-54 -8.OOE-04 1.IOE-03 3.90E-03 AP DEMO 36 18252-03 8/1812004 Nb-95 I.OOE-03 1.30E-02 4.40E-02 AP DEMO 36 L8252-03 8/1812004 Ru-103 3. 1OE-03 7.SOE-03 2.SOE-02 AP DEMO 36 L8252-03 8/1812004 Ru-106 -1.40E-02 1.IOE-02 3.90E-02 AP DEMO 36 L8252-03 8/18/2004 Sb-124 -8.OOE-03 1.20E-02 4.30E-02 AP DEMO 36 18252-03 8/1812004 Sb-125 7.00E-04 2.20E-03 7.60E-03 AP DEMO 36 L8252-03 8/1812004 Se-75 -8.00E-04 1.60E-03 5.60E-03 AP DEMO 36 L8252-03 8/1812004 Zn-65 4.40E-03 4.30E-03 1.40E-02 AP DEMO 36 L8252-03 8/1812004 Zr-95 3.1 OE-03 6.1 OE-03 2.1 OE-02 AP DEMO 36 L8361-05 812612004 AcTh-228 -3.00E-03 4.90E-03 1.70E-02 AP DEMO 36 L8361-05 812612004 Ag-108m -5.40E-04 6.90E-04 2.40E-03 AP DEMO 36 L8361-05 8/2612004 Ag-i lOm 7.00E-04 1.80E-03 6. 1OE-03 AP DEMO 36 L8361-05 812612004 Ba-140 9.00E-01 1.40E+00 4.80E+00 AP DEMO 36 L8361-05 812612004 Be-7 7.40E-02 3.70E-02 1.20E-01 AP DEMO 36 L8361-05 8s26/2004 Ce-141 -2.00E-03 1.60E-02 5.30E-02 AP DEMO 36 L8361-05 812612004 Cc-144 6.1 OE-03 4.60E-03 1.SOE-02 AP DEMO 36 L8361-05 812612004 Co-57 1.18E-03 5.90E-04 l.90E-03 AP DEMO 36 L8361-05 812612004 Co-58 2.00E-04 3.00E-03 1.OOE-02 AP DEMO 36 L361-05 8/2612004 Co-60 4.00E-04 1.IOE-03 3.70E-03 AP DEMO 36 L8361-05 812612004 Cr-51 -4.00E-02 1.70E-01 S.90E-01 AP DEMO 36 L8361-05 8/26204 Cs-134 -8.00E-04 1.30E-03 4.60E-03 AP DEMO 36 L8361-05 812612004 Cs-137 8.70E-04 8.90E-04 3.00E-03 AP DEMO 36 L8361-05 812612004 Fe-59 9.00E-03 1.80E-02 6.20E-02 AP DEMO 36 L8361-05 8n2612004 GROSS BETA 2.76E-02 2.60E-03 6.SOE-03 AP DEMO 36 L8361-05 8n26/2004 1-131 -8.30E+01 8.OOE+01 2.80E+02

• Radioactivity detected in sample (ire., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-14

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L8361-05 8/26/2004 K-40 1.40E-02 1.70E-02 5.70E-02 AP DEMO 36 L8361-05 8/26/2004 La-140 1.OOE+00 1.60E+00 5.50E+OO AP DEMO 36 L8361-05 8/26/2004 Mn-54 -3.OOE-03 1.20E-03 4.50E-03 AP DEMO 36 L8361-05 826/2004 NbM95 O.OOE+00 1.50E-02 4.90E-02

_ AP DEMO 36 L8361-05 8/26/2004 Ru-103 9.60E-03 8.60E-03 2.80E-02 AP DEMO 36 L8361-05 8/26/2004 Ru-106 9.OOE-03 1.1OE-02 3.70E-02 AP DEMO 36 L8361-05 8/26/2004 Sb-124 9.60E-03 9.40E-03 3.20E-02 AP DEMO 36 L8361-05 8/26/2004 Sb-125 -5.OOE-04 2.30E-03 8.00E-03 AP DEMO 36 L8361-05 8/26/2004 Se-75 2.40E-03 1.80E-03 6.10E-03 AP DEMO 36 L8361-05 8/26/2004 Znb5 -8.00E-04 4.60E-03 1.60E-02 AP DEMO 36 L8361-05 8/26/2004 Zr-95 6.OOE-04 6.70E-03 2.30E-02 AP DEMO 36 L8360-01 8/31/2004 Aclh-228 -7.10E-03 9.40E-03 3.30E-02 AP DEMO 36 L8360-01 8131/2004 Ag-lOSm 2.OOE-04 1.60E-03 S.40E-03 AP DEMO 36 L8360-01 8131/2004 Ag-I lOm -9.OOE-04 3.80E-03 1.30E-02

_ AP DEMO 36 L8360-01 8/31/2004 Ba-140 -2.SOE+00 1.60E+00 6.30E+00 AP DEMO 36 L8360-01 8/31/2004 Be-7 5.30E-02 6.50E-02 2.20E-01 AP DEMO 36 L8360-01 8/31/2004 Cc-141 1.90E-02 2.20E-02 7.20E-02 AP DEMO 36 L8360-01 8/31/2004 Ce-144 2.40E-03 9.00E-03 3.00E-02 AP DEMO 36 L8360-01 8/31/2004 Co-57 9.00E-04 1.10E-03 3.60E-03 AP DEMO 36 L8360-01 8/31/2004 Co-58 3.40E-03 6.30E-03 2.20E-02 AP DEMO 36 L8360-01 8/31/2004 Co-60 5.30E-03 2.90E-03 9.SOE-03 AP DEMO 36 L8360-01 8/31/2004 Cr-51 2.OOE-01 2.30E-01 7.80E-01 AP DEMO 36 L8360-01 8/31/2004 Cs-134 4.30E-03 2.50E-03 8.20E-03 AP DEMO 36 L8360-01 8/31/2004 Cs-137 5.OOE-04 1.90E-03 6.60E-03 AP DEMO 36 L8360-01 8/31/2004 Fe-59 -9.1OE-02 3.40E-02 1.40E-01 AP DEMO 36 L8360-01 8/31/2004 GROSS BETA 1.53E-02 3.70E-03 1.10E-02 +

AP DEMO 36 L8360-01 8/31/2004 1-131 9.80E+01 5.IOE+01 1.70E+02 AP DEMO 36 L8360-01 8/31/2004 K-4o -5.00E-02 4.1OE-02 1.50E-01 AP DEMO 36 L8360-01 8/31/2004 La-140 -2.90E+00 l.90E+00 7.30E+00 AP DEMO 36 L8360-01 8/31/2004 Mn-54 4.OOE-04 2.60E-03 9.20E-03 AP DEMO 36 L8360-01 8/31/2004 Nb-95 -3.40E-02 2.40E-02 8.70E-02 AP DEMO 36 L8360-01 8/31/2004 Ru-103 7.00E-03 1.30E-02 4.SOE-02 AP DEMO 36 L8360-01 8/31/2004 Ru-106 -2.1OE-02 2.1OE-02 7.40E-02 AP DEMO 36 L8360-01 8/31/2004 Sb-124 1.30E-02 2.20E-02 7.80E-02 AP DEMO 36 L8360-01 8/31/2004 Sb-125 -S.OOE-04 5.40E-03 1.90E-02 AP DEMO 36 L8360-01 8/31/2004 Se-75 -5.OOE-04 3.40E-03 1.IOE-02 AP DEMO 36 L8360-01 8/31/2004 Zn-65 -1.311E-02 7.20E-03 2.70E-02 AP DEMO 36 L8360-01 8/31/2004 Zr-95 7.OOE-03 1.30E-02 4.60E-02 AP DEMO 36 L8360-05 9/7/2004 Ac1h-228 -5.20E-03 3.50E-03 1.20E-02 AP DEMO 36 L8360-05 9n/2004 Ag-lOSm 1.40E-04 4.60E-04 1.50E-03 AP DEMO 36 L8360-05 9n72004 Ag-I lOm -8.00E-04 1.20E-03 4.OOE-03 AP DEMO 36 L8360-05 9/7/2004 Ba-140 4.80E-01 3.70E-01 1.20E+00 AP DEMO 36 L8360-05 9/7/2004 Be-7 1.90E-02 2.20E-02 7.20E-02 AP DEMO 36 L8360-05 9n72004 Cc-141 -1.60E-02 9.70E-03 3.30E-02 AP DEMO 36 L8360-05 9/7/2004 Cc-144 2.80E-03 2.90E-03 9.50E-03 AP DEMO 36 L8360-05 9n72004 Co- 57 5.70E-04 3.60E-04 1.20E-03

• Radioactivity detected in sample (i.e, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-15

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L8360-05 9/7/2004 Co-58 4.OOE-04 1.90E-03 6.40E-03 AP DEMO 36 L8360-05 9/7/2004 Co-60 -2.10E-04 6.90E-04 2.40E-03 AP DEMO 36 L8360-05 917/2004 Cr-5I -I.IOE-02 7.OOE-02 2.40E-0I AP DEMO 36 L8360-05 9/7/2004 Cs-134 7.80E-04 7.20E-04 2.40E-03 AP DEMO 36 L8360-05 9/7/2004 Cs-137 -7.OOE-04 6.OOE-04 2.1OE-03 AP DEMO 36 L8360-05 9/7/2004 Fc-59 9.20E-03 9.30E-03 3. 1OE-02 AP DEMO 36 L8360-05 9/7/2004 GROSS BErA 1.89E-02 2.20E-03 6.00E-03 AP DEMO 36 L8360-05 9/7/2004 1-131 -4.00E+00 1.10E+01 3.80E+01 AP DEMO 36 L8360-05 9/7/2004 K40 -1.30E-02 1.20E-02 4.10E-02 AP DEMO 36 L8360-05 9/7/2004 La-140 5.50E-01 4.20E-01 1.40E+00 AP DEMO 36 L8360-05 9/7/2004 Mn-54 3.90E-04 7.70E-04 2.60E-03 AP DEMO 36 L8360-05 9/712004 Nb-95 -2.10E-03 9.90E-03 3.30E-02 AP DEMO 36 L8360-05 9/7/2004 Ru-103 -1.OOE-04 4.20E-03 1.40E-02 AP DEMO 36 L8360-05 9n72004 Ru-106 -1.00E-04 7.00E-03 2.40E-02 AP DEMO 36 L8360-05 9/7/2004 Sb-124 -7.70E-03 5.60E-03 2.00E-02 AP DEMO 36 L8360-05 9/7/2004 Sb-125 2.1OE-03 1.SOE-03 4.90E-03 AP DEMO 36 L8360-05 9n/2004 Se-75 2.OOE-04 I.IOE-03 3.80E-03 AP DEMO 36 L8360-05 9/7/2004 Zn-65 4.00E-04 3.70E-03 1.20E-02 AP DEMO 36 L8360-05 9/7/2004 Zr-95 -4.60E-03 3.60E-03 1.20E-02 AP DEMO 36 L8252-07 9/14/2004 Aclh-228 -4.50E-03 S.OOE-03 1.70E-02 AP DEMO 36 L8252-07 9/14/2004 Ag-108m 7.90E-04 8.70E-04 2.90E-03 AP DEMO 36 L8252-07 9/14/2004 Ag-lOrn 2.40E-03 2.50E-03 8.40E-03 AP DEMO 36 L8252-07 9/14/2004 Ba-140 -4.00E-02 4.40E-01 1.60E+00 AP DEMO 36 L8252-07 9/14/2004 Bc-7 7.80E-02 3.90E-02 1.30E-0I AP DEMO 36 L8252-07 9/14/2004 Cc-141 9.OOE-03 1.20E-02 3.90E-02 AP DEMO 36 L8252-07 9/14/2004 Ce-144 2.70E-03 5.IOE-03 1.70E-02 AP DEMO 36 L8252-07 9/14/2004 Co-57 9.60E-04 7.00E-04 2.30E-03 AP DEMO 36 L8252-07 9/14/2004 Co-58 -4.90E-03 3.80E-03 1.30E-02 AP DEMO 36 L8252-07 9/14/2004 Co-60 1.75E-01 3.00E-03 4.90E-03

• AP DEMO 36 L8252-07 9/14/2004 Cr-SI -3.00E-02 1.IOE-01 3.80E-01 AP DEMO 36 L8252-07 9/14/2004 Cs-134 1.20E-03 1.60E-03 5.30E-03 AP DEMO 36 L8252-07 9/14/2004 Cs-137 2.19E-02 1.90E-03 5.30E-03

• AP DEMO 36 L8252-07 9/14/2004 Fe-59 -1.20E-02 1.60E-02 S.80E-02 AP DEMO 36 L8252-07 9/14/2004 GROSS BETA 1.39E-01 4.50E-03 7.1OE-03

• AP DEMO 36 L8252-07 9/14/2004 1-131 -1.00E+00 1.IOE+01 3.70E+01 AP DEMO 36 L8252-07 9/14/2004 K-40 -1.IOE-02 2.10E-02 7.30E-02 AP DEMO 36 L8252-07 9/14/2004 La-140 -4.00E-02 5.IOE-0I 1.80E+00 AP DEMO 36 L8252-07 9/14/2004 Mn-54 -2.50E-03 1.70E-03 6.00E-03 AP DEMO 36 L8252-07 9/14/2004 Nb-95 1.20E-02 1.20E-02 4.00E-02 AP DEMO 36 L8252-07 9/14/2004 Ru-103 -6.00E-03 7.40E-03 2.SOE-02 AP DEMO 36 L8252-07 9/14/2004 Ru-106 -9.00E-03 1.40E-02 4.70E-02 AP DEMO 36 L8252-07 9/14/2004 Sb-124 8.00E-04 9.00E-03 3.20E-02 AP DEMO 36 L8252-07 9/14/2004 Sb-125 2.70E-03 2.80E-03 9.SOE-03 AP DEMO 36 L8252-07 9/14/2004 Se-75 -3.60E-03 2.10E-03 7.40E-03 AP DEMO 36 L8252-07 9/14/2004 Zn-65 1.30E-03 7.80E-03 2.60E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-16

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L8252-07 9/14/2004 Zr-95 -2.50E-03 6.90E-03 2.40E-02 AP DEMO 36 L8253-01 9/21/2004 AcTh-228 2.20E-03 3.70E-03 1.20E-02 AP DEMO 36 L8253-01 9/21/2004 Ag-108m -9.OOE-05 3.50E-04 1.20E-03 AP DEMO 36 L8253-01 9/21/2004 Ag-I lOm 4.70E-04 8.OOE-04 2.70E-03 AP DEMO 36 L8253-01 9/21/2004 Ba-140 -2.20E-01 1.60E-01 5.60E-01 AP DEMO 36 L8253-01 9/21/2004 Be-7 3.30E-02 1.70E-02 5.60E-02 AP DEMO 36 L8253-01 9/21/2004 Ce-141 2.20E-03 3.90E-03 1.30E-02 AP DEMO 36 L8253-01 9/21/2004 Cc-144 2.20E-03 1.70E-03 5.60E-03 AP DEMO 36 L8253-01 9/21/2004 Co-57 4.10E-04 2.10E-04 6.90E-04 AP DEMO 36 L8253-01 9/21/2004 Co-58 -9.OOE-04 1.30E-03 4.40E-03 AP DEMO 36 L8253-01 9/21/2004 Co-60 5.32E-03 S.50E-04 2.20E-03

• AP DEMO 36 L8253-01 9/21/2004 Cr-51 -2.70E-02 3.40E-02 1.20E-01 AP DEMO 36 L8253-01 9/21/2004 Cs-134 -2.30E-04 5.90E-04 2.00E-03 AP DEMO 36 L8253-01 9/21/2004 Cs-137 4.15E-03 6.60E-04 2.10E-03

• AP DEMO 36 L8253-01 9/21/2004 Fc-59 -2.80E-03 6.80E-03 2.30E-02 AP DEMO 36 L8253-01 9/21/2004 GROSS BETA 2.36E-02 2.50E-03 6.60E-03

• AP DEMO 36 L8253-01 9/21/2004 1-131 2.1OE+00 2.60E+00 8.50E+00 AP DEMO 36 L8253-01 9/21/2004 K-40 -6.00E-03 1.30E-02 4.40E-02 AP DEMO 36 L8253-01 9/21/2004 La-140 -2.SOE-01 1.80E-01 6.40E-01 AP DEMO 36 L8253-01 9/21/2004 Mn-54 1.20E-04 6.20E-04 2.10E-03 AP DEMO 36 L8253-01 9/21/2004 Nb-95 1.1IE-02 5.70E-03 I.90E-02 AP DEMO 36 L8253-01 9/21/2004 Ru-103 4.00E-04 2.40E-03 7.90E-03 AP DEMO 36 L8253-01 91/2004 Ru-106 -1.40E-03 4.80E-03 1.60E-02 AP DEMO 36 L8253-01 9/21/2004 Sb-124 -2.OOE-04 4.10E-03 1.40E-02 AP DEMO 36 L8253-01 9/21/2004 Sb-125 -5.00E-04 2.00E-03 6.60E-03 AP DEMO 36 L8253-01 9/21/2004 Sc-75 9.30E-04 7.00E-04 2.30E-03 AP DEMO 36 L8253-01 9/21/2004 Zn-65 7.40E-03 2.70E-03 8.90E-03 AP DEMO 36 L8253-01 9/21/2004 Zr-95 -8.OOE-04 2.50E-03 8.30E-03 AP DEMO 36 L8320-02 9/28/2004 AcTh-228 -9.00E-04 1.60E-03 6.30E-03 AP DEMO 36 L8320-02 9/28/2004 Ag-108m -3.10E-04 3.40E-04 1.30E-03 AP DEMO 36 L8320-02 9/28/2004 Ag-I lOnm 6.60E-04 9.40E-04 3.30E-03 AP DEMO 36 L8320-02 9/28/2004 Ba-140 0.00E+00 1.40E-01 5.70E-01 AP DEMO 36 L8320-02 9/28/2004 Be-7 I.90E-02 I.90E-02 6.40E-02 AP DEMO 36 L8320-02 9/28/2004 Cc-141 4.00E-03 6.00E-03 2.OOE-02 AP DEMO 36 L8320-02 9/28/2004 Cc-144 -1.40E-03 2.50E-03 8.90E-03 AP DEMO 36 1.8320-02 9/28/2004 Co-57 -1.50E-04 3.00E-04 I.IOE-03 AP DEMO 36 L8320-02 9/28/2004 Co-58 -1.70E-03 1.30E-03 5.20E-03 AP DEMO 36 L8320-02 9/28/2004 Co-60 1.14E-02 8.20E-04 2.00E-03 AP DEMO 36 L8320-02 9/28/2004 Cr-51 2.20E-02 5.40E-02 I.90E-01 AP DEMO 36 L8320-02 9/28/2004 Cs-134 -4.30E-04 4.30E-04 1.80E-03 AP DEMO 36 L8320-02 9/28/2004 Cs-137 1.40E-03 5.OOE-04 1.50E-03 AP DEMO 36 L8320-02 9/28/2004 Fe-59 -I.OOE-03 4.90E-03 1.90E-02 AP DEMO 36 L8320-02 9/28/2004 1-131 -1.20E+00 2.OOE+00 7.20E+00 AP DEMO 36 L8320-02 9/28/2004 K-40 6.50E-03 7.1 OE-03 2.40E-02 AP DEMO 36 L8320-02 9/28/2004 La-140 O.OOE+00 1.70E-01 6.50E-01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-17

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCilm3) (pCi/m3)

AP DEMO 36 L8320-02 9/28/2004 Mn-54 -4.20E-04 6.OOE-04 2.30E-03 AP DEMO 36 L8320-02 9128/2004 Nb-95 -8.60E-03 4.70E-03 I.90E-02 AP DEMO 36 L8320-02 9/2&82004 Ru-103 -8.00E-04 2.50E-03 9.60E-03 AP DEMO 36 L8320-02 98212004 Ru-106 9.30E-03 5.30E-03 1.70E-02 AP DEMO 36 L8320-02 9/2812004 Sb-124 2.00E-03 3.80E-03 1.40E-02 AP DEMO 36 L8320-02 9128/2004 Sb-125 3.OOE-04 I.IOE-03 3.90E-03 AP DEMO 36 L8320-02 9/2812004 Se-75 8.00E-05 9.50E-04 3.30E-03 AP DEMO 36 L8320-02 9/28/2004 Zn-65 1.40E-03 1.20E-03 4.20E-03 AP DEMO 36 L8320-02 9/282004 Zr-95 -4.1OE-03 2.80E-03 I.IOE-02 AP DEMO 36 L8362-01 91812004 AcTh-228 -3.40E-03 4.80E-03 1.60E-02 AP DEMO 36 L8362-01 9/28/2004 Ag-108m -7.30E-04 6.70E-04 2.30E-03 AP DEMO 36 L8362-01 912812004 Ag-i iOkn 9.OOE-04 1.50E-03 5.20E-03 AP DEMO 36 L8362-01 912812004 Ba-140 2.OOE-02 2.50E-01 8.50E-01 AP DEMO 36 L8362-01 9n822004 Bc-7 5.50E-02 2.40E-02 7.80E-02 AP DEMO 36 L8362-01 91822004 Cc-141 -1.89E-02 9.00E-03 3.1OE-02 AP DEMO 36 L8362-01 912812004 Ce-144 -4.40E-03 4.10E-03 1.40E-02 AP DEMO 36 L8362-01 912812004 Co-57 7.00E-05 6.40E-04 2.1OE-03 AP DEMO 36 L8362-01 9/28/2004 Co-58 I.50E-03 2.OOE-03 6.80E-03 AP DEMO 36 L8362-01 9/28/2004 Co-60 I.OOE-03 I .OOE-03 3.40E-03 AP DEMO 36 L8362-01 912812004 Cr-51 4.60E-02 7.30E-02 2.50E-0I AP DEMO 36 L8362-01 9/2812004 Cs-134 9.00E-04 1.00E-03 3.30E-03 AP DEMO 36 L8362-01 9/2812004 Cs-137 -6.20E-04 8.80E-04 3.101E-03 AP DEMO 36 L8362-01 9128/2004 Fe-59 -5.00E-03 I.IOE-02 3.70E-02 AP DEMO 36 L8362-01 9/2812004 GROSS BETA 2.71E-02 2.70E-03 7.1OE-03 AP DEMO 36 L8362-01 9/2n82004 1-131 9.50E+00 4.60E+00 1.50E+O1 AP DEMO 36 L8362-01 9/2812004 K-40 I.00E-02 I.SOE-02 5.00E-02 AP DEMO 36 L8362-01 9/28/2004 IA-140 2.00E-02 2.80E-01 9.80E-0I AP DEMO 36 L8362-01 912812004 Mn-54 8.00E-04 I.00E-03 3.50E-03 AP DEMO 36 L8362-01 9/2812004 Nb-95 9.60E-03 6.OOE-03 2.00E-02 AP DEMO 36 L8362-01 9/2812004 Ru-103 -2.40E-03 4.00E-03 1.40E-02 AP DEMO 36 L8362-01 912812004 Ru-106 1.23E-02 9.90E-03 3.30E-02 AP DEMO 36 L8362-01 9/28/2004 Sb-124 -7.50E-03 6.SOE-03 2.40E-02 AP DEMO 36 L8362-01 9/28/2004 Sb-125 -2.80E-03 2.20E-03 7.50E-03 AP DEMO 36 L8362-01 912812004 Se-75 -4.00E-04 1.40E-03 4.60E-03 AP DEMO 36 L8362-01 9/28/2004 Zn-65 -2.00E-03 3.70E-03 1.30E-02 AP DEMO 36 L8362-01 9128/2004 Zr-95 0.OOE+00 4. 1OE-03 1.40E-02 AP DEMO 36 L8362-05 10/512004 GROSS BETA 2.68E-02 2.90E-03 7.90E-03 AP DEMO 36 L8809-02 10/512004 Aclh-228 -1.80E-02 2.90E-02 I.IOE-01 AP DEMO 36 L8809-02 10/512004 Ag-lOSm -3. 1OE-03 6.30E-03 2.30E-02 AP DEMO 36 L8809-02 10/5/2004 Ag-I lOm 6.00E-03 1.40E-02 5.20E-02 AP DEMO 36 L8809-02 10/5/2004 Ba-140 O.OOE+00 4.50E+01 1.80E+02 AP DEMO 36 L8809-02 10/512004 Be-7 2.20E-01 3.90E-01 1.40E+00 AP DEMO 36 L8809-02 10/5/2004 Ce-141 -3.90E-01 2.70E-01 9.70E-0I AP DEMO 36 L8809-02 10/5/2004 Ce-144 -2.90E-02 5.IOE-02 1.80E-01 AP DEMO 36 L8809-02 10/5/2004 Co-57 3.20E-03 5.80E-03 2.00E-02 AP DEMO 36 L8809-02 10/512004 Co-58 -7.40E-02 3. 1OE-02 1.40E-0I

• Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-18

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 36 L8809-02 10/5/2004 Co-60 -4.20E-03 8.60E-03 3.50E-02 AP DEMO 36 L8809-02 1015/2004 Cr-sI -3.OOE-01 2.60E+00 9.30E+00 AP DEMO 36 L8809-02 10/5/2004 Cs-134 1.soE-03 8.60E-03 3.20E-02 AP DEMO 36 L8809-02 10/5/2004 Cs-137 5.00E-03 8.20E-03 2.90E-02 AP DEMO 36 L8809-02 10/5/2004 Fe-59 7.00E-02 1.40E-01 5.30E-01 AP DEMO 36 L8809-02 10/5/2004 1-131 0.OOE+00 6.40E+03 2.30E+04 AP DEMO 36 L8809-02 10/5/2004 K-40 -4.00E-02 1.00E-01 3.90E-O0 AP DEMO 36 L8809-02 10/5/2004 La-140 0.00E+00 5.20E+01 2.10E+02 AP DEMO 36 L8809-02 10/5/2004 Mn-54 5.30E-03 9.80E-03 3.S0E-02 AP DEMO 36 L8809-02 10/5/2004 Nb-95 2.00E-01 1.60E-01 5.S0E-01 AP DEMO 36 L8809-02 10/5/2004 Ru-103 1.S0E-02 9.40E-02 3.S0E-01 AP DEMO 36 L8809-02 10/5/2004 Ru-106 -1.78E-O1 9.70E-02 3.90E-01 AP DEMO 36 L8809-02 10/5/2004 Sb-124 1.80E-01 1.30E-01 4.40E-0I AP DEMO 36 L8809-02 10/5/2004 Sb-125 -s.OOE-03 2.OOE-02 7.S0E-02 AP DEMO 36 L8809-02 10/5/2004 Se-75 2.OOE-03 1.80E-02 6.40E-02 AP DEMO 36 L8809-02 10/5/2004 Zn-65 -7.90E-02 3.10E-02 1.30E-01 AP DEMO 36 L8809-02 10/5/2004 Zr-95 3.20E-02 5.90E-02 2.10E-01 AP DEMO 44 L6840-01 1/7/2004 GROSS BETA 2.02E-02 1.90E-03 4.50E-03 0 AP DEMO 44 L6888-04 1/13/2004 GROSS BETA 2.01E-02 2.20E-03 5.80E-03

• AP DEMO 44 L6929-02 1/28/2004 GROSS BETA 2.81E-02 2.20E-03 5.20E-03 0 AP DEMO 44 L6994-06 2/9/2004 GROSS BETA 3.95E-02 4.40E-03 1.20E-02 * +

AP DEMO 44 L6996-04 2/17/2004 GROSS BETA 3.93E-02 3.OOE-03 7.20E-03 AP DEMO 44 L7039-O1 2/25/2004 GROSS BETA 1.99E-02 2.70E-03 7.70E-03 0 AP DEMO 44 L7103-06 3/4/2004 GROSS BETA 1.92E-02 3. 1OE-03 9.00E-03 0 AP DEMO 44 L7103-02 3/10/2004 GROSS BETA 4.62E-02 5.OOE-03 1.40E-02 0 +

AP DEMO 44 L7179-01 3/17/2004 GROSS BETA 4.06E-02 3.S0E-03 8.70E-03 0 AP DEMO 44 L7179-05 3/24/2004 GROSS BETA 5.29E-02 3.80E-03 8.90E-03 AP DEMO 44 L7432-04 3/24/2004 AcTh-22s -3.80E-03 3.40E-03 1.S0E-02 AP DEMO 44 L7432-04 3/2412004 Ag-lOSm 0.00E+00 6.60E-04 2.60E-03 AP DEMO 44 L7432-04 3/24/2004 Ag-110m 1.80E-03 1.IOE-03 3.30E-03 AP DEMO 44 L7432-04 3/24/2004 Ba-140 1.80E-01 2.60E-01 9.80E-01 AP DEMO 44 L7432-04 3/24/2004 Be-7 7.40E-02 3. 1OE-02 9. 1OE-02 AP DEMO 44 L7432-04 3/24/2004 Ce-141 -2.S0E-03 8.80E-03 3.30E-02 AP DEMO 44 L7432-04 3/24/2004 Ce-144 -8.80E-03 4.70E-03 1.901E-02 AP DEMO 44 L7432-04 3/24/2004 Co-57 8.90E-04 6.IOE-04 2.00E-03 AP DEMO 44 L7432-04 3/24/2004 Co-58 6.00E-04 2.30E-03 9.20E-03 AP DEMO 44 L7432-04 3/24/2004 Co-60 -5.20E-04 9.90E-04 4.S0E-03 AP DEMO 44 L7432-04 3/24/2004 Cr-s5 -1.07E-01 9. IOE-02 3.70E-01 AP DEMO 44 L7432-04 3/24/2004 Cs-134 -1.12E-03 8.40E-04 4.1OE-03 AP DEMO 44 L7432-04 3/24/2004 Cs-137 -2.20E-04 8.70E-04 3.S0E-03 AP DEMO 44 L7432-04 3/24/2004 Fe-59 -1.14E-02 8.1OE-03 4.00E-02 AP DEMO 44 L7432-04 3/24/2004 1-131 1.IOE+00 2.1OE+00 8.OOE+O0 AP DEMO 44 L7432-04 3/24/2004 K-40 -5.47E-02 9.40E-03 6.40E-02 AP DEMO 44 L7432-04 3/24/2004 La-140 2.10E-01 2.90E-0l 1.IOE+00 0 Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-19

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 44 L7432-04 3/24/2004 Mn-54 -8.OOE-04 1.OOE-03 4.60E-03 AP DEMO 44 L7432-04 3/24/2004 Nb-95 -3.soE-03 5.SOE-03 2.50E-02 AP DEMO 44 L7432-04 3/24/2004 Ru-103 0.OOE+00 4.60E-03 1.80E-02 AP DEMO 44 L7432-04 3/24/2004 Ru-106 2.20E-03 8.80E-03 3.40E-02 AP DEMO 44 L7432-04 3/24/2004 Sb-124 -6.20E-03 6.20E-03 3.30E-02 AP DEMO 44 L7432-04 3/24/2004 Sb-125 -5.00E-04 2.20E-03 8.70E-03 AP DEMO 44 L7432-04 3/24/2004 Se-75 I.lOE-03 1.70E-03 6. 10E-03 AP DEMO 44 L7432-04 3/24/2004 Zn-65 -3.1OE-03 3.1OE-03 1.40E-02 AP DEMO 44 L7432-04 3/24/2004 Zr-95 -1.40E-03 4.1OE-03 .801E-02 AP DEMO 44 L7755-03 3/30/2004 GROSS BETA 3.21E-02 2.70E-03 6.soE-03

• AP DEMO 44 L7755-07 4/5/2004 GROSS BETA 2.18E-02 2.40E-03 6.soE-03 AP DEMO 44 L7756-02 4/14/2004 GROSS BETA 1.70E-02 1.70E-03 4.20E-03 AP DEMO 44 L7756-06 4/21/2004 GROSS BETA 2.35E-02 2.30E-03 5.70E-03

• AP DEMO 44 L7757-01 4/28/2004 GROSS BETA 2.49E-02 2.30E-03 5.soE-03 AP DEMO 44 L7757-0S 5/5/2004 GROSS BETA 2.95E-02 2.90E-03 7.30E-03

• AP DEMO 44 L7759-02 5/12/2004 GROSS BETA 2.58E-02 2.soE-03 7.70E-03

• AP DEMO 44 L7759-05 5/19/2004 GROSS BETA 2.80E-02 3.20E-03 9.OOE-03

• AP DEMO 44 L7759-10 5/26/2004 GROSS BETA 2.06E-02 3.1OE-03 9.OE-03

• AP DEMO 44 L7878-03 5/26/2004 AcTh-228 -2.90E-03 4.SOE-03 1.90E-02 APDEMO 44 L7878-03 5/26/2004 Ag-lOSm -s.OOE-04 1.IOE-03 4.20E-03 AP DEMO 44 L7878-03 5/26/2oo4 Ag-1 lo0n 4.OOE-03 2.20E-03 6.90E-03 AP DEMO 44 L7878-03 5/26/2004 Ba-140 1.IOE-0I 3.20E-01 1.30E+00 AP DEMO 44 L7878-03 5/26/2004 Be-7 4.40E-02 4.1OE-02 1.40E-01 AP DEMO 44 L787"-03 5s26/2004 Ce-141 3.00E-03 LIOE-02 3.80E-02 AP DEMO 44 L7878-03 5/26/2004 Cc-144 2.00E-04 5.40E-03 1.901E-02 AP DEMO 44 L7878-03 5/26/2004 Co-57 1.64E-03 8.30E-04 2.70E-03 AP DEMO 44 L7878-03 5/26/2004 Co-58 -5.20E-03 2.60E-03 1.30E-02 AP DEMO 44 L7878-03 5/26/2004 Co-60 -1.70E-03 2.00E-03 8.20E-03 AP DEMO 44 L7878-03 5/26/2004 Cr-51 -1.27E-01 9.30E-02 3.80E-01 AP DEMO 44 L7878-03 5/26/2004 Cs-134 L.OOE-03 L.50E-03 5.60E-03 AP DEMO 44 L7878-03 5/26/2004 Cs-137 5.00E-04 2.30E-03 8.OOE-03 AP DEMO 44 L7878-03 5/26/2004 Fe-59 -1.30E-02 1.20E-02 5.30E-02 AP DEMO 44 L7878-03 5/26/2004 1-131 -2.SOE+00 4.90E+00 1.90E+01 AP DEMO 44 L7878-03 5/26/2004 K-40 3.00E-03 2.00E-02 7.SOE-02 AP DEMO 44 L7878-03 5/26/2004 La-140 1.20E-01 3.70E-0I 1.SOE+00 AP DEMO 44 L7878-03 5/26/2004 Mn-54 -1.12E-03 9.90E-04 4.soE-03 AP DEMO 44 L7878-03 5/26/2004 Nb-95 1.34E-02 7.50E-03 2.30E-02 AP DEMO 44 L7878-03 5/26/2004 Ru-103 3.70E-03 6.60E-03 2.40E-02 AP DEMO 44 L7878-03 5/26/2004 Ru-106 I.OOE-02 1.20E-02 4.40E-02 AP DEMO 44 L7878-03 5/26/2004 Sb-124 I.39E-02 8.80E-03 2.70E-02 AP DEMO 44 L7878-03 5/26/2004 Sb-125 -. IOE-03 3.60E-03 1.40E-02 AP DEMO 44 L7878-03 5/26/2004 Se-75 3.70E-03 2.20E-03 7.1OE-03 AP DEMO 44 L7878-03 5/26/2004 Zn-65 -6.SOE-03 4.40E-03 1.90E-02 AP DEMO 44 L7878-03 5/26/2004 Zr-95 -1.80E-03 6.70E-03 2.70E-02 AP DEMO 44 L7930-02 62o004 GROSS BETA I.s8E-02 3.OOE-03 9.OOE-03

• Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-20

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

APDEMO 44 L7930-06 6/8/2004 GROSS BETA 7.79E-02 4.1OE-03 8.60E-03

• AP DEMO 44 L7931-03 6/16/2004 GROSS BETA 2.57E-02 2.80E-03 7.30E-03

• AP DEMO 44 L7931-06 6/23/2004 GROSS BETA 2.64E-02 3.1OE-03 8.40E-03 0 AP DEMO 44 L7939-03 6/30/2004 GROSS BETA 2.45E-02 3.20E-03 8.90E-03

• AP DEMO 44 L7939-07 7/72004 GROSS BETA I.981E-02 2.30E-03 6.20E-03

• AP DEMO 44 L7940-03 7/13/2004 GROSS BETA 2.90E-02 3.40E-03 9.30E-03

• AP DEMO 44 L7940-06 7/20/2004 GROSS BETA 2.48E-02 2.90E-03 7.80E-03

• AP DEMO 44 L7941-02 7/27/2004 GROSS BETA 3.05E-02 3.1OE-03 8.20E-03 0 AP DEMO 44 L7941-06 814/2004 GROSS BETA 2.65E-02 2.70E-03 7.1OE-03

• APDEMO 44 L8361-03 8/10/2004 GROSS BETA 2.47E-02 3.00E-03 8.30E-03

• AP DEMO 44 L8252-02 8/18/2004 GROSS BETA 1.70E-02 2.SOE-03 7.20E-03

• AP DEMO 44 L8361-07 8/26/2004 GROSS BETA 3.07E-02 3. 1OE-03 8. 1OE-03

• AP DEMO 44 L8360-03 8/31/2004 GROSS BETA 3.99E-02 4.70E-03 1.30E-02 * +

AP DEMO 44 L8360-07 9/7n2004 GROSS BETA 3.26E-02 3.60E-03 9.80E-03

• AP DEMO 44 18252-06 9/14/2004 GROSS BETA 3.1 1E-02 3.40E-03 9.1OE-03

• APDEMO 44 18253-03 9/21/2004 GROSS BETA 2.33E-02 3.30E-03 9. IOE-03

• AP DEMO 44 L8362-03 9/28/2004 GROSS BETA 3.68E-02 3.70E-03 9.80E-03

• AP DEMO 44 1320-03 9/282004 AcTh-228 -1.00E-03 3.90E-03 1.60E-02 APDEMO 44 L8320-03 9/28/2004 Ag-108m -3.20E-04 7.IOE-04 2.90E-03 AP DEMO 44 L8320-03 9/28/2004 Ag-llOmn 9.00E-04 1.801E-03 7. 1OE-03 AP DEMO 44 L8320-03 9/28/2004 Ba-140 -2.70E-01 3.90E-01 I.80E+00 AP DEMO 44 L8320-03 9/28/2004 Bc-7 3.00E-02 4.70E-02 1.70E-0I AP DEMO 44 L8320-03 9/28/2004 Ce-141 2.00E-03 I.001E-02 3.70E-02 AP DEMO 44 L8320-03 9/28/2004 Ce-144 1.30E-03 S.IOE-03 I.801E-02 AP DEMO 44 L8320-03 9/28/2004 Co-57 -7.40E-04 6.70E-04 2.60E-03 AP DEMO 44 L8320-03 9/28/2004 Co-58 2.1OE-03 3.30E-03 1.20E-02 AP DEMO 44 L8320-03 9/28/2004 Co-60 4.90E-03 1.80sE-03 4.50E-03 AP DEMO 44 L8320-03 9/28/2004 Cr-SI -1.70E-01 1.20E-01 4.90E-01 APDEMO 44 L8320-03 9/28/2004 Cs-134 -1.30E-03 1.40E-03 5.80E-03 APDEMO 44 L8320-03 9/28/2004 Cs-137 -2. 1OE-03 I.90E-03 7.soE-03 AP DEMO 44 L8320-03 9/28/2004 Fe-59 -8.OOE-03 9.80E-03 4.80E-02 AP DEMO 44 L8320-03 9/28/2004 1-131 -1.40E+00 3.80E+00 1.50E+01 AP DEMO 44 1,8320-03 9/28/2004 K-40 -I .OOE-03 1.60E-02 6.30E-02 AP DEMO 44 L8320-03 9/28/2004 La-140 -3.101E-01 4.40E-0I 2.10E+00 AP DEMO 44 L8320-03 9/28/2004 Mn-54 -3.OOE-04 1.40E-03 5.60E-03 AP DEMO 44 L8320-03 9/28/2004 Nb-95 1.48E-02 9.40E-03 3.00E-02 AP DEMO 44 L8320-03 9/28/2004 Ru-103 -1.25E-02 7.70E-03 3.30E-02 AP DEMO 44 L8320-03 9/28/2004 Ru-106 -5.00E-03 1.00E-02 4.30E-02 AP DEMO 44 L8320-03 9/28/2004 Sb-124 1.28E-02 7.40E-03 1.20E-02 AP DEMO 44 L8320-03 9/28/2004 Sb-125 2. 1OE-03 2.1 OE-03 7.40E-03 AP DEMO 44 L8320-03 9/28/2004 Se-75 6.00E-04 I.901E-03 7.00E-03 AP DEMO 44 L8320-03 9/28/2004 Zn-65 -1.OOE-03 3.90E-03 1.60E-02 AP DEMO 44 L8320-03 9/28/2004 Zr-95 7.70E-03 5.80E-03 1.90E-02 APDEMO 44 L8362-07 10/5/2004 GROSS BETA 2.57E-02 3.00E-03 8.30E-03

• AP DEMO 44 L8363-03 10/12/2004 GROSS BETA 3.53E-02 3.50E-03 9. IOE-03 0

• Radioactivity detected in sample (ie., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Umit of Detection Requirement A-21

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCilm3) (pCim3) (pCi/m3)

AP DEMO 44 L8363-07 10/20/2004 GROSS BETA 3.06E-02 3.40E-03 9.20E3-03

• AP DEMO 44 L8405-04 10/26/2004 GROSS BETA 2.75E-02 3.90E.03 1.IOE-02

• AP DEMO 44 L8405-07 11/3/2004 GROSSBETA 2.38E-02 3.I1OE-03 8.60E-03 * +

AP DEMO 44 L8536-04 11/9/2004 GROSS BETA 3.24E-02 5.I1OE-03 I1.50E-02

• AP DEMO 44 L8536-08 11/17/2004 GROSSBETA 2.73E-02 2.60E-03 6.90E-03

• AP DEMO 44 L8809-03 11/17/2004 AcTh-228 -6.30E-03 9.OOE-03 3.90E-02 AP DEMO 44 L8809-03 11/17/2004 Ag-108m -1.90E-03 1.50E-03 6.8OE-03 AP DEMO 44 L8809-03 11/17/2004 Ag- 10m -4.90E-03 4.60E-03 2.OOE-02 AP DEMO 44 L8809-03 11/17/2004 Ba-140 -8.00E-01 I .8OE+00 8.80E+00 AP DEMO 44 L8809-03 11/17/2004 Be-7 -1.39E-01 9.OOE-02 3.90E-01I AP DEMO 44 L8809-03 11/17/2004 Ce-141 7.70E-02 3.90E-02 1.20E-01 AP DEMO 44 L8809-03 11/17/2004 Ce-144 -7.OOE-03 I1.60E-02 6.OOE-02 AP DEMO 44 L8809-03 11/17/2004 Co-57 1.IOE-03 I1.80E-03 6.20E-03 AP DEMO 44 L8809-03 11/1712004 Co-58 1.50E-03 6.70E-03 2.70E-02 AP DEMO 44 L8809-03 11/17/2004 Co-60 -3.OOE-04 2.40E-03 1.IOE-02 AP DEMO 44 1,8809-03 11/17/2004 G-51 1.90E-01 3.90E-01 I1.40E+00 AP DEMO 44 L8809-03 11/17/2004 Cs-134 -5.SOE-03 2.80E-03 I.30E.02 AP DEMO 44 L8809-03 11/17/2004 Cs-137 -5.00E-04 2.OOE-03 8.30E-03 AP DEMO 44 L8809-03 11/17/2004 Fc-59 -2.90E-02 2.90E-02 1.40E-01 AP DEMO 44 L8809-03 11/17/2004 1-131 8. IOE+OI 7.90E+01 2.70E+02 AP DEMO 44 L8809-03 11/17/2004 K-40 -1.60E-02 2.50E-02 1.20E-01 AP DEMO 44 L8809-03 11/17/2004 La-140 -9.OOE-01 2.10OE+00 1.OOE+01 AP DEMO 44 L8809-03 11/17/2004 Mn-54 -3.20E-03 2.70E-03 I1.30E-02 AP DEMO 44 L8809-03 11/17/2004 Nb-95 1.60E-02 3.OOE-02 1.IOE-01I AP DEMO 44 L8809-03 11/17/2004 Rn-103 2.OOE-02 I .8013-02 6.10E-02 AP DEMO 44 L8809-03 11/17/2004 Ru-106 I IOE-02 2.60E-02 9.90E-02 AP DEMO 44 L8809-03 11/17/2004 Sb-124 I .OOE-02 I1.70E-02 7.20E-02 AP DEMO 44 L8809-03 11/17/2004 Sb-125 6.20E-03 5.70E-03 2.OOE-02 AP DEMO 44 L8809-03 11/17/2004 Se-75 3.90E-03 5. IOE-03 1.80E-02 AP DEMO 44 L8809-03 11/17/2004 Zn-65 -1.30E-02 9.20E-03 4.IOE-02 AP DEMO 44 L8809-03 11/17/2004 Zr-95 -I .OOE-03 1.IOE-02 4.8OE-02 AP DEMO 50 L6840-03 I1/2004 GROSSBETA 3.18E-02 2.50E-03 5.80E-03 AP DEMO 50 L6888-01 1/13/2004 GROSSBETA 3.09E-02 2.80E-03 7. 1OE-03 AP DEMO 50 L6929-03 1/28/2004 GROSS BETA 1.63E-02 I1.50E-03 3.70E-03 AP DEMO 50 L6994-02 2/4/2004 GROSS BETA 2.56E-02 2.40E-03 6. 1OE-03 AP DEMO 50 L6994-04 2/9/2004 GROSS BETA 3.1 IE-02 3.20E-03 8.50E-03

• AP DEMO 50 L7432-05 219/2004 AcTh-228 1.19E-02 6.30E-03 1.90E-02 AP DEMO 50 L7432-05 2/9/2004 Ag-108m -1.50E-03 I1.50E-03 6. 1OE-03 AP DEMO 50 L7432-05 2/912004 Ag-110m -I .OOE-03 3.OOE-03 1.30E-02 AP DEMO 50 L7432-05 2/9/2004 Ba-140 O.OOE+00 I1.50E+00 8.00E+00 AP DEMO 50 L7432-05 2/9/2004 Be-7 -1.60E-02 7.50E-02 3.00E-0O AP DEMO 50 L7432-05 2/9/2004 Cc-141 9.00E-03 3.70E-02 1.30E-01 AP DEMO 50 L7432-05 2/9/2004 Ce-144 -1.OOE-03 1.1I OE-02 4.10E-02 AP DEMO 50 L7432-05 2/9/2004 Co-57 1.40E-03 I1.30E-03 4.50E-03

• Radioactivity detected in sample (i.e, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-22

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/mn3) (pCi/m3)

AP DEMO 50 L7432-05 2/9/2004 Co-58 4.20E-03 4.70E-03 1.70E-02 AP DEMO 50 L7432-05 2/9/2004 CO-60 4.40E-03 1.soE.03 2.00E-03 AP DEMO 50 L7432-05 2/9/2004 Cr-SI -5.OOE-01 2.SOE-01 1.20E+00 AP DEMO 50 L7432-05 2/9/2004 Cs-134 2.OOE-03 1.70E-03 5.90E-03 AP DEMO 50 L7432-05 2/9/2004 Cs-137 -1.30E-03 1.60E-03 6.90E-03 AP DEMO 50 L7432-05 2/9/2004 Fc-S9 -2.60E-02 2.30E-02 1.IOE-OI AP DEMO 50 L7432-05 2/9/2004 1-131 -1.30E+02 1.20E+02 5.OOE+02 AP DEMO 50 L7432-05 2/9/2004 K-40 -1.07E-01 1.90E-02 1.30E-01 AP DEMO 50 L7432-05 2/9/2004 La-140 0.OOE+00 1.80E+00 9.10E+00 AP DEMO 50 L7432-05 2/9/2004 Mn-54 -9.OOE-04 L.80E-03 8.1 OE-03 AP DEMO 50 L7432-05 2/9/2004 Nb-95 LOOE-03 2. 1OE-02 8.60E-02 AP DEMO 50 L7432-05 2/9/2004 Ru-103 *4.00E-03 1.90E-02 7.20E-02 AP DEMO 50 L7432-05 2/9/2004 Ru-106 -2.10E-02 1.90E-02 8.30E-02 AP DEMO 50 L7432-05 2/9/2004 Sb-124 -1.70E-02 1.70E-02 9.IOE-02 AP DEMO 50 L7432-05 2/9/2004 Sb-125 -4.90E-03 4.SOE-03 1.90E-02 AP DEMO 50 L7432-05 2/9/2004 se-75 -7.70E-03 3.30E-03 L.SOE-02 AP DEMO 50 L7432-O5 2/9/2004 Zn-65 -8.70E-03 6.70E-03 3.00E-02 AP DEMO 50 L7432-O5 2/9/2004 Zr-95 -2.05E-02 9.1 OE-03 5.OOE-02 AP DEMO 50 L7756-07 4/21/2004 GROSS BETA 2.90E-02 2.1OE-03 4.90E-03 AP DEMO 50 L7757-06 5/5/2004 GROSS BETA 2.57E-02 2.30E-03 5.80E-03

• AP DEMO 50 L7759-07 5/19/2004 GROSS BETA 3.20E-02 3.OOE-03 8.OOE-03

• AP DEMO 50 L7759-08 5/26/2004 GROSS BETA I.48E-02 2.20E-03 6.SOE-03

• AP DEMO 50 L7878-04 5/26/2004 AcTh-228 3.OOE-04 8.70E-03 3.40E-02 AP DEMO 50 L7878-04 5/26/2004 Ag-lOSm 2.90E-03 2. 1OE-03 6.90E-03 AP DEMO 50 L7878-04 5/26/2004 Ag-l IOm I .OOE-04 4.40E-03 1.70E-02 AP DEMO 50 L7878-04 5/26/2004 Ba-140 -6.20E-01 3.10E-01 1.90E+O0 AP DEMO 50 L7878-04 5/26/2004 Bc-7 1.53E-01 6.60E-02 2.00E-O1 AP DEMO 50 L7878-04 5/26/2004 Ce-141 -3.00E-03 1.70E-02 6.20E-02 APDEMO 50 L7878-04 5/26/2004 Cc-144 -8.OOE-03 L.lOE-02 4.1OE-02 AP DEMO 50 L7878-04 5/26/2004 Co-57 1.IOE-03 1.50E-03 5.OOE-03 AP DEMO 50 L7878-04 5/26/2004 Co-ss 1.70E-03 5.40E-03 2. 1OE-02 AP DEMO 50 L7878-04 5/26/2004 Co-60 -7.00E-04 2.soE-03 1.20E-02 AP DEMO SO L787s 5/26/2004 Cr-SI -1.40E-01 1.40E-01 5.60E-Ol AP DEMO 50 L7878-04 5/26/2004 Cs-134 .IOE-03 3.30E-03 1.20E-02 AP DEMO 50 L7878-04 5/26/2004 Cs-137 -1.00E-03 4.40E-03 1.60E-02 AP DEMO 50 L787-4 5/26/2004 Fe-S9 -6.00E-03 2.1OE-02 8.80E-02 AP DEMO 50 L7878-04 5/26/2004 1-131 -7.00E+00 5.40E+00 2.30E+0I AP DEMO 50 L7878-04 5/26/2004 K-40 9.60E-02 3.50E-02 8.90E-02 AP DEMO 50 L7878-04 5/26/2004 IA-140 -7.10E-01 3.50E-01 2.10E+00 AP DEMO SO L7878-04 5/26/2004 Mn-54 6.OOE-04 2.70E-03 L.OOE-02 AP DEMO 50 L7878-04 5/26/2004 Nb-95 1.40E-02 1.50E-02 5.50E-02 AP DEMO 50 L7878-04 5/26/2004 Ru-103 6.00E-03 1.20E-02 4.30E-02 AP DEMO 50 L7878-04 5/26/2004 Ru-106 -3.SOE-02 2.30E-02 .OOE-01 AP DEMO 50 L7878-04 5s26u2004 Sb-124 -s.00E-03 1.50E-02 7.20E-02 AP DEMO 50 L7878-04 5/26/2004 Sb-125 -3.20E-03 5.70E-03 2.20E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-23

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 50 L7878-04 5/26/2004 Se-75 2.70E-03 4. IOE-03 I1.40E-02 AP DEMO 50 L7878-04 5/26/2004 Zn-65 -1.08E-02 7.20E3-03 3.30E-02 AP DEMO 50 L7878-04 5/26/2004 Zr-95 O.OOE+00 I.00E.-02 4.I1OE-02 AP DEMO 50 L7930-04 6//oo4 GROSS BETA 1.57E-02 2.20E-03 6.40E-03 APDEMO 50 L7930-08 6/8/2004 GROSS BETA 1.41 E-02 2.70E-03 8.00E-03 AP DEMO 50 L7931-02 6/16/2004 GROSS BETA 2.12E-02 2.OOE-03 5.1IO-03 AP DEMO 50 L7931-08 6/23/2004 GROSS BETA 2.20E-02 2.20E-03 5.80E-03 AP DEMO 50 L7939-04 6/30/2004 GROSS BETA 2.36E-02 2.30E-03 5.80E-03 AP DEMO 50 L7939-08 7/7/2004 GROSS BETA 2.09E-02 2.10E-03 5.50E-03 AP DEMO 50 L7940-04 7/13/2004 GROSS BETA 1.61E-02 3. IOE-03 9.30E-03 APDEMO 50 L8320-04 7/13/2004 AcTh-228 1.65E-02 7. IOE-03 2.OOE-02 APDEMO 50 L8320-04 7/13/2004 Ag-108m 1.70E-03 I1.6013-03 5.40E-03 APDEMO 50 1320-04 7/l32004 Ag-l lOm -3.70E-03 2.90E-03 I1.50E-02 AP DEMO 50 L8320-04 7/13/2004 Ba-140 6.70E+00 6.70E+00 I1.80E+01 AP DEMO 50 L8320-04 7/13/2004 Be-7 O.OOE+00 1.IOE-01I 4.20E-01 AP DEMO 50 L8320-04 7/13/2004 Ce-141 -8.00E-03 5.60E-02 2.10OE-01 AP DEMO 50 L8320-04 7/13/2004 Cc-144 6.30E-03 9.70E-03 3.40E-02 AP DEMO 50 L8320-04 7/13/2004 CD-57 2.30E-03 I1.30E-03 4.10OE-03 APDEMO 50 L8320-04 7/13/2004 Co-58 -1.48E-02 8.90E-03 4.20E-02 AP DEMO 50 L8320-04 7/13/2004 Co60 7.00E-04 2.OOE-03 8.30E-03 AP DEMO SO L8320-04 7/13/2004 Cr-SI 9.00E-02 6.60E-01 2.50E+00 AP DEMO 50 L8320-04 7/13/2004 Cs-134 I.OOE-04 2.50E-03 l.00E-02 AP DEMO 50 L8320-04 7/13/2004 Cs-137 2.90E-03 3. IOE-03 1.1I OE-02 APDEMO 50 L8320-04 7/13/2004 Fe-59 I.50E-02 2.60E-02 1. IOE-01 AP DEMO 50 L8320-04 7/13/2004 1-131 1.20E+03 1.60E+03 5.70E+03 AP DEMO 50 L8320-04 7/13/2004 K-40 -1.60E-02 2.50E-02 1.IOE-01 APDEMO 50 L8320-04 7/13/2004 La-140 7.80E+00 7.80E+00 2.10OE+01 APDEMO 50 L8320-04 7/13/2004 Mn-54 5.00E-04 2.60E-03 I .00E-02 APDEMO 50 L8320-04 7/13/2004 Nb-95 2.00E-03 5.20E-02 2.0013-01 AP DEMO 50 L8320-04 7/13/2004 Ru-103 O.OOE+00 2.30E-02 9.40E-02 AP DEMO 50 L8320-04 7/13/2004 Ru-106 -3.OOE-02 I1.80E-02 8.40E-02 AP DEMO 50 L8320-04 7/13/2004 Sb-124 -2.00E-03 2.7013-02 I1.30E-01 AP DEMO 50 L8320-04 7/13/2004 Sb-125 -9.80E-03 4.40E-03 2.OOE-02 AP DEMO SO L8320-04 7/13/2004 Se-75 4.00E-04 4.70E-03 I1.70E-02 AP DEMO 50 L8320-04 7/13/2004 Zn-65 -3.90E-03 5.50E-03 2.60E-02 AP DEMO 50 L8320-04 7/13/2004 Zr-95 -9.OOE-03 I1.80E-02 7.50E-02 APDEMO 68 L7940-07 7/20/2004 GROSS BETA 2.31 E-02 2.30E-03 5.90E-03 APDEMO 68 L7941-03 7/27/2004 GROSS BETA 2.19E-02 2.20E-03 5.70E-03 APDEMO 68 L7941-07 8/4/2004 GROSS BETA 2.0SE-02 I1.90E3-03 4.90E-03 AP DEMO 68 18252-01 8/18/2004 GROSS BETA 2.39E-02 2.0013-03 5.0013-03 APDEMO 68 L8252-05 9/14/2004 GROSS BETA 1.28E-02 I1.90E3-03 5.60E-03 AP DEMO 68 L8253-04 9/21/2004 GROSS BETA 2.46E-02 2.2013-03 5.60E-03 AP DEMO 68 L8360-04 8/31/2004 GROSS BETA 4.02E-02 3.30E-03 8.20E-03 AP DEMO 68 L8360-08 9n72004 GROSS BETA 2.27E-02 2.30E-03 6.OOE-03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-24

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 68 L8361-04 8/10/2004 GROSS BETA 1.90E-02 2.40E-03 6.70E-03

• AP DEMO 68 L8361-08 8/26/2004 GROSS BErA 3.05E-02 2.00E-03 4.60E-03

• AP DEMO 68 L8362-04 9/2812004 GROSS BETA 3.22E-02 2.50E-03 6.OOE-03

• AP DEMO 68 L8320-05 9/28/2004 AcTh-228 0.OOE+00 3.90E-03 1.60E-02 AP DEMO 68 L8320-05 9/28/2004 Ag-108m 0.OOE+00 7.1 OE-04 2.80E-03 AP DEMO 68 L8320-05 9/28/2004 Ag-110m -3.OOE-04 1.60E-03 7.OOE-03 AP DEMO 68 L8320-05 9/28/2004 Ba-140 0.OOE+00 O.OOE+00 2.60E-01 AP DEMO 68 L8320-05 9/28/2004 Be-7 6.OOE-02 3.70E-02 1.20E-01 AP DEMO 68 L8320-05 9/28/2004 Ce-141 -2.OOE-03 1.10E-02 3.90E-02 AP DEMO 68 L8320-05 9/28/2004 Ce-144 3.60E-03 4.80E-03 1.70E-02 AP DEMO 68 L8320-05 9/28/2004 Co-57 -3.50E-04 6.80E-04 2.60E-03 AP DEMO 68 L8320-05 9/28/2004 Co-5S -4.00E-03 2.80E-03 1.30E-02 AP DEMO 68 L8320-05 9/28/2004 Co-60 -8.00E-04 1.40E-03 6.40E-03 AP DEMO 68 L8320-05 9/28/2004 Cr-51 -6.20E-02 8.40E-02 3.40E-01 AP DEMO 68 L8320-05 9/28/2004 Cs-134 -1.40E-03 1.40E-03 6.10E-03 AP DEMO 68 L8320-05 9/28/2004 Cs-137 2.70E-03 2.OOE-03 6.50E-03 AP DEMO 68 L8320-05 9/2n82004 Fe-59 -6.80E-03 8.40E-03 4. 1OE-02 AP DEMO 68 L8320-05 9/28/2004 1-131 -1.70E+00 2.30E+00 9.70E+00 AP DEMO 68 L8320-05 9/28/2004 K-40 3.50E-02 1.80E-02 5.30E-02 AP DEMO 68 L8320-05 98/2004 La-140 0.00E+00 0.00E+00 3.00E-01 AP DEMO 68 L8320-05 9/28/2004 Mn-54 1.00E-03 1.50E-03 5.50E-03 AP DEMO 68 L8320-05 9/28/2004 Nb-95 2.90E-03 7.80E-03 3.OOE-02 AP DEMO 68 L8320-05 9/28/2004 Ru-103 -1.30E-03 5.40E-03 2.20E-02 AP DEMO 68 L8320-05 9/28/2004 Ru-106 -1.70E-02 1.00E-02 4.80E-02 AP DEMO 68 L8320-05 9/28/2004 Sb-124 3.00E-03 1.10E-02 4.30E-02 AP DEMO 68 L8320-05 9/28/2004 Sb-125 -5.20E-03 2.50E-03 1.20E-02 AP DEMO 68 L8320-05 9/28/2004 Se-75 -1.70E-03 1.80E-03 7.20E-03 AP DEMO 68 L8320-05 9/28/2004 Zn-65 -3.00E-03 4.20E-03 1.80E-02 AP DEMO 68 L8320-05 9/28/2004 Zr-95 7.1OE-03 5.20E-03 1.80E-02 AP DEMO 68 L8362-08 10/5/2004 GROSS BErA 2.63E-02 2.SOE-03 6.60E-03

• AP DEMO 68 L8363-04 10/12/2004 GROSS BETA 3.30E-02 2.40E-03 5.60E-03

• AP DEMO 68 L8363-08 10/20/2004 GROSS BETA 2.25E-02 2.1OE-03 5.40E-03

• AP DEMO 68 L8405-03 10/26/2004 GROSS BETA 1.99E-02 2.70E-03 7.40E-03 AP DEMO 68 L8405-08 11/3/2004 GROSS BETA 1.88E-02 2. 10E-03 5.70E-03 AP DEMO 68 L8536-03 11/9/2004 GROSS BETA 3.33E-02 2.90E-03 7.30E-03

• AP DEMO 68 L8536-07 11/17/2004 GROSS BETA 2.85E-02 2.OOE-03 4.70E-03

• AP DEMO 68 L8S37-03 11/23/2004 GROSS BETA 3.73E-02 3.20E-03 8.30E-03

• AP DEMO 68 L8537-06 11/30/2004 GROSS BETA 2.10E-02 2.70E-03 7.60E-03

• AP DEMO 68 L8655-03 12/8/2004 GROSS BETA 2.30E-02 2.10E-03 5.40E-03

• AP DEMO 68 L8655-06 12/16/2004 GROSS BETA 1.74E-02 2.20E-03 6.30E-03

• AP DEMO 68 L8809-04 12/28n004 AcTh-228 l.OOE-03 3.40E-03 1.30E-02 AP DEMO 68 L8809-04 12/28/2004 Ag-lO8m -1.07E-03 6.00E-04 2.70E-03 AP DEMO 68 L8809-04 12/28/2004 Ag-I 10m 4.00E-04 1.70E-03 6.60E-03 AP DEMO 68 L8809-04 12/28/2004 Ba-140 -5.OOE-02 1.20E-01 S.80E-01 AP DEMO 68 L8809-04 12/28/2004 Bc-7 8.IOE-02 2.90E-02 8.30E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-25

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 68 L8809-04 12/28/2004 Ce-141 -2.25E-02 8.6013-03 3.50E-02 AP DEMO 68 L8809-04 12/28/2004 Cc-144 -8.90E-03 5.4013-03 2.101E-02 AP DEMO 68 1,8809-04 12/28n2004 CO5- 4.40E-04 5.50E-04 I1.90E-03 AP DEMO 68 L8809-04 12/282004 Co-58 -1 .80E-03 1.90E-03 8.6013-03 AP DEMO 68 L8809-04 12/28/2004 Co-60 5.001E-04 I1.201E-03 4.70E-03 AP DEMO 68 1,8809-04 12/28/2004 Cr-51 2.4013-02 7.3013-02 2.7013-01 AP DEMO 68 L8809-04 12/28n204 Cs-134 2.0013-04 8.60E-04 3.4013-03 AP DEMO 68 L8809-04 12/28/2004 Cs-137 -1 .09E-03 7.9013-04 3.60E-03 AP DEMO 68 L8809-04 12/28/2004 Fe-59 -4.80E-03 8.301E-03 3.60E-02 AP DEMO 68 L8809-04 12/28/2004 1-131 2.50E+00 1.301E+00 4.2013+00 APDEMO 68 L8809-04 12/28/2004 K40 L OOE-03 I .0013-02 4.IOE-02 AP DEMO 68 L8809-04 12/28/2004 La-140 -6.001E-02 I1.4013-01 6.7013-01 APDEMO 68 L8809-04 12/28/2004 Mn-54 1.IOE-03 I .00E-03 3.5011-03 AP DEMO 68 L8809-04 12/28/2004 Nb-95 1.9013-03 6.30E-03 2.40E-02 AP DEMO 68 L8809-04 12/28/004 Ru-103 -2.80E-03 3.90E-03 1.6013-02 AP DEMO 68 L8809-04 12/28/2004 Ru-106 -1.37E-02 8.9013-03 4.OOE-02 AP DEMO 68 L8809-04 12/28/2004 Sb-124 -2.70E-03 4.7013-03 2.50E-02 AP DEMO 68 L8809-04 12/28/2004 Sb-125 -9.00E-04 2. 1OE-03 8.5OE-03 AP DEMO 68 L8809-04 12/28/2004 Se-75 I .0013-03 1.601E-03 5.70E-03 AP DEMO 68 L8809-04 12/28/2004 Zn-65 -5.1OE-03 2.6013-03 I1.3013-02 AP DEMO 68 L8809-04 12/28/2004 Zr-95 3.OOE-03 3.9013-03 I1.40E-02 AP DEMO 72 L6840-04 in72004 GROSS BETA 5.601E-03 I1.201E-03 3.40E-03

• AP DEMO 72 L6888-02 1/13/2004 GROSS BErA 8.20E-03 1.5011-03 4.40E-03

• APDEMO 72 L6929-04 1/28/2004 GROSS BErA 1.3 1E-02 2.2013-03 6.3013-03

• AP DEMO 72 L6994-03 2/4/2004 GROSS BETA 2.45E-02 3.7013-03 1.1OE3-02 * .4.

APDEMO 72 L6996-01 2/17/2004 GROSS BETA 2.10E-02 9.8013-04 1.9011-03

• AP DEMO 72 L7039-02 2/25/2004 GROSS BETA 2.36E-02 I1.40E3-03 3.20E-03

• AP DEMO 72 L7103-08 3/4/2004 GROSS BETA 2.74E-02 1.60E-03 3.70E-03

• 2.2013-03 5.90E-03

• AP DEMO 72 L7103-04 3/10/2004 GROSS BETA 2.721E-02 1.601E-03 3.70E-03

• APDEMO 72 L7179-02 3/17/2004 GROSS BETA 2.14E-02 2.43E-02 I1.60E-03 3.70E-03

• AP DEMO 72 L7179-07 3/24/2004 GROSS BETA AP DEMO 72 L7432-06 3/24/2004 AcTh-228 -1.90E-03 I1.80E-03 9.3013-03 AP DEMO 72 L7432-06 3/24/2004 Ag-108m 2.60E-04 5.50E-04 2.OOE-03 AP DEMO 72 L7432-06 3/24/2004 Ag-110m 4.OOE-04 1.201E-03 4.9013-03 AP DEMO 72 L7432-06 3/24/2004 Ba-140 I1.701E-01 I1.20E3-01 2.20E-01 AP DEMO 72 L7432-06 3/24/2004 Bc-7 8.90E-02 3.101E-02 8.70E-02 AP DEMO 72 L7432-06 3/24/2004 Ce-141 I1.2313-02 8.30E-03 2.70E-02 APDEMO 72 L7432-06 3/24/2004 Ce-144 6.8013-03 4.7013-03 I1.601E-02 AP DEMO 72 L7432-06 3/24/2004 Co-57 8.60E-04 4.80E-04 1.501-03 AP DEMO 72 L7432-06 3/24/2004 Co-58 3.0013-04 I1.6013-03 6.80E-03 AP DEMO 72 L7432-06 3/24/2004 CO-60 -4.OOE-04 6.001E-04 3.2013-03 AP DEMO 72 L7432-06 3/24/2004 Cr-51 -8.40E-02 7.IOE-02 3.OOE-01 AP DEMO 72 L7432-06 3/24/2004 Cs-134 4.5013-04 8.7013-04 3.30E.03 AP DEMO 72 L7432-06 3/24/2004 Cs-137 2.601E-04 7.3013-04 2.80E-03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-26

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 72 L7432-06 3/24/2004 Fe-59 1.04E-02 7.40E-03 2.40E-02 AP DEMO 72 L7432-06 3/24/2004 1-131 -3.1OE+00 1.90E+00 9.00E+00 AP DEMO 72 L7432-06 3/24/2004 K-40 -4.60E-02 1.OOE-02 6.00E-02 AP DEMO 72 L7432-06 3/24/2004 La-140 1.90E-01 1.30E-01 2.60E-01 AP DEMO 72 L7432-06 3/24/2004 Mn-54 1.14E-03 8.60E-04 2.90E-03 AP DEMO 72 L7432-06 3/24/2004 Nb-95 -2.SOE-03 6.30E-03 2.60E-02 AP DEMO 72 L7432-06 3/24/2004 Ru-103 1.00E-03 4.SOE-03 1.70E-02 AP DEMO 72 L7432-06 3/24/2004 Ru-106 3.OOE-04 7.20E-03 2.90E-02 AP DEMO 72 L7432-06 3/24/2004 Sb-124 -8.SOE-03 4.90E-03 3.00E-02 AP DEMO 72 L7432-06 3/24/2004 Sb-125 0.00E+00 1.60E-03 6.30E-03 AP DEMO 72 L7432-06 3/24/2004 Se-75 0.00E+00 1.SOE-03 5.60E-03 AP DEMO 72 L7432-06 3/24/2004 Zn-65 1.40E-03 1.OOE-03 1.90E-03 AP DEMO 72 L7432-06 3/24/2004 Zr-95 2.70E-03 3.10E-03 1.20E-02 AP DEMO 72 L7755-01 3/30/2004 GROSS BETA 2.85E-02 2.40E-03 5.90E-03

• AP DEMO 72 L7755-05 4/5/2004 GROSS BETA 1.94E-02 2.101E-03 S.60E-03

• AP DEMO 72 L7756-03 4/14/2004 GROSS BETA 1.67E-02 1.50E-03 3.70E-03

• AP DEMO 72 L7878-05 4/14/2004 AcTh-228 9.80E-03 8.10E-03 2.80E-02 AP DEMO 72 L7878-05 4/14/2004 Ag-108m 7.00E-04 2.30E-03 8.30E-03 AP DEMO 72 L7878-0S 4/14/2004 Ag-l lOm 5.80E-03 4.80E-03 1.70E-02 AP DEMO 72 L7878-05 4/14/2004 Ba-140 2.30E+00 2.30E+00 8.30E+00 AP DEMO 72 L7878-05 4/14/2004 Be-7 -1.30E-01 l.20E-01 4.80E-0I AP DEMO 72 L7878-05 4/14/2004 Ce-141 -3.60E-02 3.80E-02 1.40E-01 AP DEMO 72 L7878-05 4/14/2004 Cc-144 -5.OOE-03 1.40E-02 5.20E-02 AP DEMO 72 L7878-05 4/14/2004 Co-57 -2.70E-03 1.60E-03 6.40E-03 AP DEMO 72 L7878-05 4/14/2004 Co-58 -4.50E-03 9.30E-03 3.80E-02 AP DEMO 72 L7878-05 4/14/2004 Co-60 1.30E-03 3.80E-03 1.40E-02 AP DEMO 72 L7878-05 4/14/2004 Cr-51 -5.80E-01 4.70E-01 1.90E+00 AP DEMO 72 L7878-05 4/14/2004 Cs-134 0.00E+00 3.30E-03 1.30E-02 AP DEMO 72 L7878-O5 4/14/2004 Cs-137 4.70E-03 4.80E-03 1.60E-02 AP DEMO 72 L7878-05 4/14/2004 Fe-59 6.20E-02 3.90E-02 1.20E-01 AP DEMO 72 L7878-05 4/14/2004 1-131 1.60E+02 1.30E+02 4.30E+02 AP DEMO 72 L7878-05 4/14/2004 K-40 6.00E-03 4.30E-02 1.60E-01 AP DEMO 72 L7878-05 4/14/2004 La-140 2.60E+00 2.60E+00 9.50E+00 AP DEMO 72 L7878-05 4/14/2004 Mn-54 3.80E-03 3.30E-03 1.10E-02 AP DEMO 72 L7878-05 4/14/2004 Nb-95 3.40E-02 4.10E-02 1.40E-0I AP DEMO 72 L7878-05 4/14/2004 Ru-103 O.OOE+00 2.30E-02 8.70E-02 AP DEMO 72 L7878-05 4/14/2004 Ru-106 -4.20E-02 2.80E-02 1.20E-01 AP DEMO 72 L7878-05 4/14/2004 Sb-124 -2.50E-02 3.1OE-02 1.40E-01 AP DEMO 72 L7878-05 4/14/2004 Sb-125 7.30E-03 7.70E-03 2.70E-02 AP DEMO 72 L7878-05 4/14/2004 Se-75 8.30E-03 5.IOE-03 1.60E-02 AP DEMO 72 L7878-05 4/14/2004 Zn-65 -1.57E-02 7.40E-03 3.70E-02 AP DEMO 72 L7878-O5 4/14/2004 Zr-95 -4.SOE-02 2.00E-02 9.20E-02 AP DEMO 74 L6840-02 1/2004 GROSS BETA 2.02E-02 2.00E-03 4.80E-03 AP DEMO 74 L6888-03 1/13/2004 GROSS BETA 3.64E-02 3.40E-03 8.90E-03

• Radioactivity detected in sample (i.e, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-27

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 74 L6929-01 1/28/2004 GROSS BETA 2.10E-02 1.80E-03 4.40E-03 AP DEMO 74 L6994-01 2/4/2004 GROSS BETA 2.37E-02 2.70E-03 7.40E-03

• AP DEMO 74 L6994-05 2/9/2004 GROSS BETA 3.78E-02 3.90E-03 I .OOE-02

• AP DEMO 74 L6996-02 2/17/2004 GROSS BETA 2.60E-02 1.80E-03 4. 1OE-03

• AP DEMO 74 L7103-07 3/4/2004 GROSS BETA 2.29E-02 I.90E-03 4.80E-03

• AP DEMO 74 L7103-03 3/10/2004 GROSS BETA 1.99E-02 2.50E-03 7.OOE-03

• AP DEMO 74 L7179-03 3/17/2004 GROSS BETA 1.80E-02 1.70E-03 4.40E-03

• AP DEMO 74 L7179-06 3/24/2004 GROSS BETA 2.37E-02 1.80E-03 4.40E-03

• AP DEMO 74 L7432-07 3/24/2004 AcTh-228 -2.50E-03 2.30E-03 1.20E-02 AP DEMO 74 L7432-07 3/24/2004 Ag-lOSm O.OOE+00 7.40E-04 2.90E-03 AP DEMO 74 L7432-07 3/24/2004 Ag-I lOm -3.70E-03 1.70E-03 8.70E-03 AP DEMO 74 L7432-07 3/24(2004 Ba-140 2.lOE-01 2.10E-01 7.90E-0O AP DEMO 74 L7432-07 3/24/2004 Be-7 4.00E-02 3.OOE-02 I.OOE-0I AP DEMO 74 L7432-07 3/24/2004 Ce-141 -9.OOE-03 1.00E-02 3.90E-02 AP DEMO 74 L7432-07 3/24/2004 Ce-i44 -1.20E-02 5.OOE-03 2.1OE-02 AP DEMO 74 L7432-07 3/24/2004 Co-57 -I.58E-03 6.80E-04 2.90E-03 AP DEMO 74 L7432-07 3/24/2004 Co-58 -I.OOE-03 2.30E-03 I.OOE-02 AP DEMO 74 L7432-07 3/24/2004 Co-60 -1.50E-03 1.30E-03 6.20E-03 AP DEMO 74 L7432-07 3/24/2004 Cr-51 -1.80E-01 9.50E-02 4.10E-01 AP DEMO 74 L7432-07 3n24(2004 Cs-134 -7.00E-04 I.OOE-03 4.50E-03 AP DEMO 74 L7432-07 3/24/2oo4 Cs-137 3.00E-04 L.OOE-03 3.90E-03 AP DEMO 74 L7432-07 3/24/2004 Fe-59 1.OOE-02 I.OOE-02 3.60E-02 AP DEMO 74 L7432-07 3/24/2004 1-131 5.40E+00 3.00E+00 9.40E+00 AP DEMO 74 L7432-07 3124/2004 K-40 -9.OOE-03 1.70E-02 7.00E-02 AP DEMO 74 L7432-07 3/24/2004 La-140 2.50E-01 2.50E-01 9.10E-01 AP DEMO 74 L7432-07 3/24/2004 Mn-54 4.00E-04 1.40E-03 5.40E-03 AP DEMO 74 L7432-07 324(2004 Nb-95 3.60E-03 S.20E-03 2.00E-02 AP DEMO 74 L7432-07 3(24(2oo4 Ru-103 8.OOE-03 5.40E-03 1.80E-02 APDEMO 74 L7432-07 3/24/2004 Ru-106 -9.OOE-03 1.IOE-02 4.SOE-02 AP DEMO 74 L7432-07 3/24/2004 Sb-124 0.00E+00 0.OOE+00 9.90E-03 AP DEMO 74 L7432-07 3/24/2004 Sb-125 -2.20E-03 2.40E-03 1.OOE-02 AP DEMO 74 L7432-07 3/24/2004 Se-75 1.30E-03 1.80E-03 6.20E-03 AP DEMO 74 L7432-07 3/24/2004 Zn-5 -1.80E-03 2.30E-03 1.I OE-02 AP DEMO 74 L7432-07 3/24/2004 Zr-95 -3.40E-03 4.1OE-03 1.90E-02 AP DEMO 74 L7755-04 3/30/2004 GROSS BETA 1.98E-02 2.20E-03 5.90E-03 AP DEMO 74 L7755-08 4/5(2004 GROSS BETA 1.46E-02 2.00E-03 5.70E-03 APDEMO 74 L7878-06 4/5/2004 AcTh-228 3.00E-02 2. 1OE-02 6.90E-02 AP DEMO 74 L7878-06 4/5/2004 Ag-lOSm -2.60E-03 3.40E-03 1.40E-02 AP DEMO 74 L7878-06 4/5/2004 Ag-i lOm -6.60E-03 9.00E-03 3.80E-02 AP DEMO 74 L7878-06 4/5/2004 Ba-140 O.OOE+00 5.30E+00 2.50E+0I AP DEMO 74 L7878-06 4/5/2004 Be-7 7.OOE-02 2.10E-01 7.70E-0I AP DEMO 74 L7878-06 4/5/2004 Ce-141 -2.50E-02 7.70E-02 2.80E-01 AP DEMO 74 L7878-06 4/5/2004 Ce-144 -2.60E-02 2.70E-02 l.OOE-01 AP DEMO 74 L7878-06 4/5/2004 Co-57 -2.40E-03 3.00E-03 I.IOE-02 AP DEMO 74 L7878-06 4/5/2004 Co-S9 -2.60E-02 I.90E-02 8.00E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-28

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

APDEMO 74 L7878-06 4/5/2004 Co-60 6.70E-03 5.20E-03 I1.70E-02 AP DEMO 74 L7878-06 4/52004 Cr-51 3.90E3-0 I 7.IOE-01 2.60E+00 AP DEMO 74 L7878-06 4/5/2004 Cs-134 4.6013-03 5.30E-03 1.90E-02 AP DEMO 74 L7878-06 4/5/2004 Cs-137 -I .53E-02 8.90E-03 3.50E-02 AP DEMO 74 L7878-06 4/5/2004 Fe-59 -7.90E-02 8.90E-02 3.70E-01 AP DEMO 74 L7878-06 4/5/2004 1-131 2.30E+02 4.OOE+02 1.40E+03 AP DEMO 74 L7878-06 4/5/2004 K-40 1.1 IE-01 6.40E-02 2.OOE-01 AP DEMO 74 L7878-06 4/5/2004 La-140 0.OOE3+00 6. 1OE+00 2.80E+01 AP DEMO 74 L7878-06 4/5/2004 Mn-54 3.30E-03 7.20E-03 2.6013-02 AP DEMO 74 L7878-06 4/5/2004 Nb-95 2.70E-02 7.OOE-02 2.6013-01 AP DEMO 74 L7878-06 4/5/2004 Ru-103 -6.50E-02 4.OOE-02 1.70E-01 AP DEMO 74 L7878-06 4/5/2004 Ru-106 -4.30E-02 4.8013-02 2.OOE-01 AP DEMO 74 L7878-06 4/5/2004 Sb-124 -6.50E-02 4.7013-02 2.50E-01 AP DEMO 74 L7878-06 4/5/2004 Sb-125 -2.0013-03 1.10E-02 4.4013-02 AP DEMO 74 L7878-06 4/5/2004 Se-75 -9.0013-04 8.90E-03 3.30E-02 AP DEMO 74 L7878-06 4/5/2004 Zn-65 0.00E+00 I .50E-02 6.OOE-02 AP DEMO 74 L7878-06 4/5/2004 Zr-95 -I1.50E-02 3.2013-02 1.30E-01 AP DEMO 75 L7940-08 7/20/2004 GROSS BETA 2.02E-02 2.20E-03 5.90E-03

• APDEMO 75 L7941-04 7/27/2004 GROSS BETA 2.69E-02 2.40E-03 6.20E-03 AP DEMO 75 L7941-08 8/4/2004 GROSS BETA 2.63E-02 2. 1OE-03 5.I1OE-03

• AP-DEMO 75 L8361-02 8/10/2004 GROSS BETA 2.32E-02 2.60E-03 6.90E-03

• APDEMO 75 L8252-04 8/18n004 GROSS BETA 2.31 E-02 2. 1OE-03 5.20E-03

• APDEMO 75 L8361-06 8/26/2004 GROSS BETA 2.94E-02 2.30E-03 5.401E-03

• AP DEMO 75 U.360-02 8/31/2004 GROSS BETA 2.83E-02 3. IOE-03 8.20E-03

• AP DEMO 75 L8360-06 9n72004 GROSS BETA 2.34E-02 2.40E-03 6.50E-03

• AP DEMO 75 L8252-08 9/14/2004 GROSS BETA 2.00E-02 2.20E-03 5.80E-03

• AP DEMO 75 L8253-02 9/21/2004 GROSS BETA 2.199E-02 2.30E-03 6.I1OE-03

• AP DEMO 75 L8320-06 9/28/2004 AcTh-22S 4.80E-03 3.80E-03 I1.30E-02 AP DEMO 75 L8320-06 9/28/2004 Ag-108m -5.60E-04 7.30E-04 3.1OE-03 AP DEMO 75 L8320-06 9/28/2004 Ag-llOm 2.60E-03 2.OOE-03 6.8013-03 AP DEMO 75 L8320-06 9/28/2004 Ba-140 4.1OE-0I 2.OOE-01 2.8013-01 AP DEMO 75 L8320-06 9/28/2004 Be-7 4.20E-02 3.70E-02 1.30E-01 AP DEMO 75 L8320-06 9/28/2004 Ce-141 1.30E-03 9. 1OE-03 3.30E-02 AP DEMO 75 L8320-06 9/28/2004 CC-144 5.OOE-03 5.60E-03 2.00E-02 AP DEMO 75 L8320-06 9/28/2004 Co-57 -1.SOE-04 7.201E-04 2.70E-03 AP DEMO 75 L8320-06 9/28/2004 Co-58 -4.30E-03 3.201E-03 1.50E-02 APDEMO 75 L8320-06 9/28/2004 Co-60 2.00E-03 I1.70E3-03 5.80E-03 AP DEMO 75 L8320-06 9/28/2004 Cr-51 I.50E-02 8.90E-02 3.30E-01 APDEMO 75 L8320-06 9/28/2004 Cs-134 -I .90E-03 I .SOE-03 6.80E-03 AP DEMO 75 L8320-06 9/28/2004 Cs-137 1.1 OE-03 2.OOE-03 7.OOE-03 AP DEMO 75 L8320-06 9/28/2004 Fe-59 0.00E+00 7.20E-03 3.30E-02 AP DEMO 75 L8320-06 9/28/2004 1-131 -1.60E+00 2.80E+00 1.I OE+OI AP DEMO 75 L8320-06 9/28/2004 K-40 1.80E-02 1.90E-02 6.60E-02 AP DEMO 75 L8320-06 9/28/2004 La-140 4.70E-0I 2.30E-01 3.20E-01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-29

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 75 L8320-06 9/28/2004 Mn-54 9.OOE-04 I1.20E-03 4.4013-03 AP DEMO 75 L8320-06 9/28/2004 Nb-95 -9.OOE-03 8.8013-03 3.90E-02 AP DEMO 75 L8320-06 9/28/2004 Ru-103 2.8013-03 4.3013-03 1.70E-02 AP DEMO 75 L8320-06 9/28/2004 Ru-106 2.0013-02 1.IOE-02 3JIOE-02 AP DEMO 75 L8320-06 9/28/2004 Sb-124 -9. 1OE-03 8.6013-03 4.60E-02 AP DEMO 75 L8320-06 9/28/2004 Sb-125 2.40E-03 3.20E-03 I1.20E-02 AP DEMO 75 L8320-06 9/28/2004 Se-75 -2.00O3-03 2. IOE-03 8.3013-03 AP DEMO 75 L8320-06 9/28/2004 Zn-65 -2. 10OE-03 3.70E-03 1.60E-02 AP DEMO 75 L8320-06 9/28/2004 Zr-95 -5.40E-03 7.7013-03 3.20E-02 AP DEMO 75 L8362-02 9/28/2004 GROSS BETA 3.40E-02 2.5013-03 6.OOE-03 AP DEMO 75 L8362-06 10/5/2004 GROSS BETA 3.2813-02 2.6013-03 6.60E-03 AP DEMO 75 L8363-02 10/12/2004 GROSS BETA 3.8 1E-02 2.80E-03 6.60E-03 AP DEMO 75 L8363-06 10/20/2004 GROSS BETA 2.07E-02 2.00O3-03 5.3013-03 AP DEMO 75 L8405-02 10/26/2004 GROSS BETA 1.7913-02 2.6013-03 7.40E-03 AP DEMO 75 L8405-06 11/3/2004 GROSS BETA 2.20E-02 2. 10E-03 5.501E-03 AP DEMO 75 1536-02 11/9/2004 GROSS BETA 1.30E-02 2.50E-03 7.30E-03 AP DEMO 75 L8536-06 11/17/2004 GROSS BETA 3.0813-02 2.2013-03 5.20E-03 AP DEMO 75 L8537-02 11/23/2004 GROSS BETA 3. 17E-02 3. 10OE-03 8.3011-03 AP DEMO 75 L8537-05 11/30/2004 GROSS BETA 1.551E-02 2.6013-03 7.60E-03 AP DEMO 75 L8655-02 12/8/2004 GROSS BETA 3.801E-03 I1.401E-03 4.50E-03 AP DEMO 75 L8655-05 12/16/2004 GROSS BETA 1.8313-02 2.3013-03 6.30E-03 AP DEMO 75 L8809-05 12/282004 AcTh-228 3.60E-03 3.20E-03 L.IOE-02 AP DEMO 75 18809-05 12/28/2004 Ag-108m 6.90E-04 6.90E-04 2.40E-03 AP DEMO 75 L8809-05 12/28/2004 Ag- 10rn 1.70E-03 I1.20E3-03 4.0011-03 AP DEMO 75 L8809-05 12/28/2004 Ba-140 1.70E-01 1.701E-01 6.OOE-01 AP DEMO 75 L8809-05 12/28/2004 Be-7 7.80E-02 3.OOE-02 8.90E-02 AP DEMO 75 L8809-05 12/28/2004 Ce-141 8.20E-03 9.4013-03 3.20E-02 AP DEMO 75 L8809-05 12/28/2004 Cc-144 7.8013-03 5.4013-03 I1.80E-02 AP DEMO 75 L8809-OS 12/28/2004 Co-57 -2.90E-04 5.70E-04 2.20E-03 AP DEMO 75 18809-05 12/28/2004 CO-S5 -2.60E-03 I1.20E-03 7.3013-03 AP DEMO 75 L8809-05 12/28/2004 Co 60 -1.57E-03 9.2013-04 4.80E-03 AP DEMO 75 L8809-05 12/28/2004 Cr-51 -2.40E-02 6.90E-02 2.70E-01 AP DEMO 75 U8809-05 12/28/2004 Cs-134 -1.OI13-03 9.60E-04 4.30E3-03 AP DEMO 75 L8809-05 12/28/2004 Cs-137 -7.OOE-05 9.40E-04 3.7013-03 AP DEMO 75 L8809-05 12/28/2004 Fe-59 2.5011-03 8.2013-03 3.201E-02 AP DEMO 75 L8809-0s 12/28/2004 1-131 I1.3013+00 1.4013+00 5.0013+00 AP DEMO 75 L8809-05 12/28/2004 K-40 6.70E-03 9.40E-03 3.60E-02 AP DEMO 75 L8809-05 12/28/2004 Ia-140 1.90E-01 1.9013-01 6.9013-01 AP DEMO 75 L8809-05 12/28/2004 Mn-54 2.20E-03 1.IOE-03 3.3013-03 AP DEMO 75 L8809-05 12/28/2004 Nb-95 -7.90E-03 6.8013-03 2.9013-02 AP DEMO 75 L8809-05 12/28/2004 Ru-103 3.90E-03 4.30E-03 I1.5013-02 AP DEMO 75 L8809-05 12/28/2004 Ru-106 -1 .90E-02 1.OOE-02 4.6013-02 AP DEMO 75 L8809-05 12/28/2004 Sb-124 -5.501E-03 5.5013-03 3.OOE-02 AP DEMO 75 18809-05 12128/2004 Sb-125 -2.70E-03 2.20E-03 9.3013-03 AP DEMO 75 L8809-05 12/28/2004 Se-75 I1.30E-03 I1.7013-03 6. 1OE-03

• Radioactivity detected in sample (i.e, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-30

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP DEMO 75 L8809-05 12/28/2004 Zn-65 3.1 OE-03 5.60E-03 2.00E-02 AP DEMO 75 L8809-05 12/28/2004 Zr-95 3.80E-03 3.30E-03 1.10E-02 AP 11 L6800-0 17/n2004 GROSS BETA 2.99E-02 1.40E-03 2.90E-03 AP 11 L6851-01 1/21/2004 GROSS BETA 2.59E-02 1.50E-03 3.30E-03

• AP 11 L6928-01 2/4/2004 GROSS BETA 2.11 E-02 1.40E-03 2.90E-03

• AP 11 L6995-01 2/18/2004 GROSS BETA 2.95E-02 1.50E-03 3.1OE-03

• AP 11 L7038-01 3/3/2004 GROSS BETA 2.88E-02 1.50E-03 2.80E-03

• AP 11 L7102-01 3/16/2004 GROSS BETA 1.82E-02 1.50E-03 3.60E-03

• AP 11 L7180-01 3/31/2004 GROSS BETA 2.35E-02 1.90E-03 3.80E-03 AP 11 L7283-01 3/31/2004 AcTh-22S 2.10E-03 2.40E-03 8.70E-03 AP 11 L7283-01 3/31/2004 Ag-108m 4.30E-04 6.10E-04 2.20E-03 AP 1I L7283-01 3/31/2004 Ag-blOm -1.00E-04 1.1OE-03 4.60E-03 AP 11 L7283-01 3/31/2004 Ba-140 -1.50E-02 3.30E-02 1.60E-01 AP 11 L7283-01 3/31/2004 Be-7 5.90E-02 2.20E-02 6.50E-02 AP 11 L7283-01 3/31/2004 Cc-141 -6.40E-03 3.80E-03 1.50E-02 AP 11 L7283-01 3/31/2004 Cc-144 -1.IOE-03 2.60E-03 1.00E-02 AP 1I L7283-01 3/31/2004 Co-57 1.00E-0s 3.60E-04 1.30E-03 AP 11 L7283-01 3/31/2004 Co-58 -2.00E-04 1.00E-03 4.60E-03 AP 11 L7283-01 3/31/2004 Co-60 -2.50E-04 6.70E-04 3.1OE-03 AP 11 L7283-01 3/31/2004 Cr-51 4.00E-03 2.70E-02 1.OOE-01 AP 11 L7283-01 3131/2004 Cs-134 -1.30E-04 7.20E-04 3.00E-03 AP 11 L7283-01 3n31/2004 Cs-137 1.30E-03 1.30E-03 4.40E-03 AP 11 L7283-01 3/31/2004 Fe-59 0.OOE+O0 3.60E-03 1.60E-02 AP 11 L7283-01 3/31/2004 1-131 1.60E-0I 1.soE-01 s.1OE-01 AP 1I L7283-01 3/31/2004 K-40 -4.5 1E-02 8.30E-03 5.30E-02 AP 11 L7283-01 3/31/2004 La-140 -1.70E-02 3.70E-02 1.80E-01 AP 11 L7283-01 3/31/2004 Mn-54 5. 1OE-04 6.50E-04 2.40E-03 AP 11 L7283-01 3/31/2004 Nb-95 -1.00E-03 2.80E-03 1.20E-02 AP 11 L7283-01 3/31/2004 Ru-103 4.30E-03 2.60E-03 8.s5OE-03 AP 11 L7283-01 3/31/2004 Ru-106 0.00E+00 4.60E-03 1.90E-02 AP 11 L7283-01 3/31/2004 Sb-124 1.70E-03 3.30E-03 1.40E-02 AP 11 L7283-01 3131/2004 Sb-125 -3. 1OE-03 1.901E-03 8.OOE-03 AP 11 L7283-01 3131/2004 Se-75 2.06E-03 9.50E-04 2.90E-03 AP 11 L7283-01 3131/2004 Zn-65 -l.20E-03 2.50E-03 1.OOE-02 AP 11 L7283-01 3/31/2004 Zr-95 -1.90E-03 2.30E-03 L.00E-02 AP II L7269-01 4/13/2004 GROSS BETA 1.32E-02 1. IOE-03 2.70E-03 a AP 11 L7381-01 4/28/2004 GROSS BETA 2.OOE-02 1.80E-03 3.60E-03

• AP 11 L7758-01 5/12/2004 GROSS BETA 1.68E-02 2.1OE-03 5.30E-03 a AP 11 L7768-01 5/26/2004 GROSS BETA 1.73E-02 1.80E-03 3.90E-03

• AP II L7769-01 6/8/2004 GROSS BETA 1.14E-02 1.20E-03 3.30E-03

• AP 11 L7770-01 6/22/2004 GROSS BETA 1.86E-02 2.00E-03 4.60E-03

• AP II L7771-01 7/6/2004 GROSS BETA 1.83E-02 2. 1OE-03 5.50E-03 a AP 11 L7879-01 7/6/2004 AcTh-228 -4.00E-04 2.50E-03 9.80E-03 AP 11 L7879-01 7/6/2004 Ag-108m 4.90E-04 4.50E-04 I.50E-03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-31

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP 11 L7879-01 7/62004 Ag-I lOm 3.00E-04 1.IOE-03 4.20E-03 AP 11 L7879-01 7/12004 Ba-140 -9.00E-03 2.60E-02 1.20E-01 AP 11 L7879-01 76/2004 Be-7 9.80E-02 2.00E-02 5.00E-02 AP 11 L7879-01 7/6/2004 Ce-141 -1.90E-03 3.00E-03 1.IOE-02 AP 11 L7879-01 7/6/2004 Cc-144 -2.10E-03 3. 1OE-03 1.20E-02 AP II L7879-01 7/6/2004 Co-57 -5. IOE-04 3.soE-04 1.40E-03 AP II L7879-01 7/6/2004 Co-58 -9.OOE-04 1.30E-03 S.50E-03 AP 11 L7879-01 7/6/2004 Co-60 -5.70E-04 7. 1OE-04 3.20E-03 AP 11 L7879-01 7/6/2004 Cr-51 2.101E-02 2.30E-02 8.20E-02 AP I1 L7879-01 7/6/2004 Cs-134 -1.00E-04 5.40E-04 2.30E-03 AP I1 L7879-01 7/6/2004 Cs-137 -4.00E-04 1.IOE-03 4.20E-03 AP II L7879-01 7/6/2004 Fe-59 4.20E-03 3.30E-03 I. IOE-02 AP 11 L7879-01 7/6/2004 1-131 -8.20E-02 9.60E-02 3.80E-01 AP I1 L7879-01 7/6/2004 K40 1.40E-03 8.SOE-03 3.30E-02 AP 11 L7879-01 7/6/2004 La-140 -L.OOE-02 3.00E-02 1.30E-01 AP 11 L7879-01 7/6/2004 Mn-54 5.OOE-05 7.60E-04 2.90E-03 AP 11 L7879-01 7/62004 Nb-95 I.801E-03 2.60E-03 9.40E-03 AP 11 L7879-01 7/6/2004 Ru-103 -4.00E-04 2.20E-03 8.50E-03 AP 11 L7879-01 7/6/2004 Ru-106 135E-02 5.30E-03 I.501E-02 AP 11 L7879-01 7/6/2004 Sb-124 1 AOE-03 3.10E-03 1.30E-02 AP 11 L7879-01 7/6/2004 Sb-125 I.80E-03 1.60E-03 5.50E-03 AP 11 L7879-01 7/6/2004 Se-75 3.90E-04 9.OOE-04 3.20E-03 AP 11 L7879-01 7/6/2004 Zn-65 -4.00E-04 1.70E-03 6.90E-03 AP 11 L7879-01 7/6/2004 Zr-95 -1.001E-04 2.50E-03 9.60E-03 AP 11 L7857-01 7/20/2004 GROSS BETA 1.23E-02 1.30E-03 3.50E-03 AP 11 L8319-01 7/20/2004 Aclh-228 2.60E-02 1.80E-02 5.90E-02 AP II L8319-01 7/20/2004 Ag-lOSm 2.00E-03 5.40E-03 2.00E-02 AP 11 L8319-01 7/20/2004 Ag-I lOm 1.20E-02 1.IOE-02 4. 1OE-02 AP 11 L8319-01 7/20/2004 Ba-140 1.60E+01 2.30E+0I 8.soE+01 AP 11 L8319-01 7/20/2004 Bc-7 -2.60E-0I 3.10E-0I 1.30E+00 AP 11 L8319-01 7/20/2004 Ce-141 2.00E-02 1.30E-01 4.80E-01 AP 11 L8319-01 7/20/2004 Ce-144 -2.SOE-02 3.20E-02 1.30E-0I AP 11 L8319-01 7/20/2004 Co-57 7.90E-03 4. 1OE-03 1.30E-02 AP 11 L8319-01 7/20/2004 Co-58 -2.00E-02 2.60E-02 1.IOE-0I AP II L8319-01 /20/2004 Co-60 6.00E-03 1.OOE-02 3.90E-02 AP 11 L8319-01 7/20/2004 Cr-51 -2.70E+00 1.40E+00 6.20E+00 AP 11 L8319-01 7/20/2004 Cs-134 7.60E-03 6.90E-03 2.40E-02 AP I1 L8319-01 7/20/2004 Cs-137 6.00E-03 1.20E-02 4.20E-02 AP II L8319-01 7/20/2004 Fe-59 0.00E+00 1.IOE-0I 4.50E-01 AP 11 L8319-01 7/20/2004 1-131 -4.00E+02 1.40E+03 5.soE+03 AP I1 L8319-01 7/20/2004 K-40 -3. 1OE-02 7.40E-02 3.30E-01 AP 11 L8319-01 7/20/2004 La-140 I.90E+01 2.60E+01 L.OOE+02 AP 11 L8319-01 7/20/2004 Mn-54 1.62E-02 6.80E-03 1.60E-02 AP I L8319-01 7/20/2004 Nb-95 7.00E-02 1.I OE-0I 4.00E-01 AP II 18319-01 7/20/2004 Ru-103 -1.26E-01 5.40E-02 2.70E-01 AP I1 L8319-01 7/20/2004 Ru-106 -3.40E-02 7.60E-02 3.1 OE-0I

• Radioactivity detected in sample (Le., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower LUmit of Detection Requirement A-32

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP 11 L8319-01 7/20/2004 Sb-124 -9.00E-03 8.90E-02 3.90E-01 AP 11 L8319-01 7/20/2004 Sb-125 -2.70E-02 1.80E-02 7.60E-02 AP 11 L8319-01 7/20/2004 Se-75 -1.SOE-02 1.30E-02 5.30E-02 AP 11 L8319-01 7/20/2004 Zn-65 -1.30E-02 2.20E-02 9.60E-02 AP 11 L8319-01 7/20/2004 Zr-95 3.50E-02 4.20E-02 1.60E-01 AP 13 L6800-02 1/7/2004 GROSS BETA 3.20E-02 1.50E-03 3. 1OE-03

• AP 13 L6851-02 1/21/2004 GROSS BErA 2.34E-02 1.50E-03 3.50E-03

• AP 13 L6928-02 2/4/2004 GROSS BErA 2.35E-02 1.50E-03 3. 10E-03 AP 13 L6995-02 2/18/2004 GROSS BErA 2.89E-02 1.60E-03 3.30E-03

• AP 13 L7038-02 3/3/2004 GROSS BETA 3.02E-02 1.60E-03 2.90E-03

• AP 13 L7102-02 3/16/2004 GROSS BETA 2.21E-02 1.60E-03 3.80E-03

• AP 13 L7180-02 3/31/2004 GROSS BETA 2.60E-02 2.OOE-03 4.OOE-03 AP 13 L7283-02 3/31/2004 AcTh-228 -1.40E-03 2.40E-03 1.103E-02 AP 13 L7283-02 3/31/2004 Ag-1osm 5.70E-04 4.70E-04 1.60E-03 AP 13 L7283-02 3/31/2004 Ag-llOin 0.00E+00 1.40E-03 5.40E-03 AP 13 L7283-02 3/31/2004 Ba-140 0.00E+00 0.00E+00 4.20E-02 AP 13 L7283-02 3/31/2004 Be-7 1.09E-01 2.50E-02 6.60E-02 AP 13 L7283-02 3/31/2004 Ce-141 8.00E-04 3.70E-03 1.40E-02 AP 13 L7283-02 3/31/2004 Ce-144 -2.60E-03 3.30E-03 1.30E-02 AP 13 L7283-02 3/31/2004 Co-57 2.00E-04 4.30E-04 1.50E-03 AP 13 L7283-02 3/31/2004 Co-58 -2.60E-03 1.50E-03 7.30E-03 AP 13 L7283-02 3/31/2004 Co-60 -2.49E-03 7.80E-04 4.60E-03 AP 13 L7283-02 3/31/2004 Cr-51 -1.00E-02 3.30E-02 1.30E-01 AP 13 L7283-02 3/31/2004 Cs-134 -6.50E-04 8.40E-04 3.70E-03 AP 13 L7283-02 3/31/2004 Cs-137 -1.20E-03 1.30E-03 4.90E-03 AP 13 L7283-02 3/31/2004 Fe-59 -3.1OE-03 5.00E-03 2.20E-02 AP 13 L7283-02 3/31/2004 1-131 -4.00E-02 1.50E-01 5.80E-01 AP 13 L7283-02 3/31/2004 K-40 -3.90E-02 8.30E-03 5.20E-02 AP 13 L7283-02 3/31/2004 1a-140 0.00E+00 0.00E+00 4.80E-02 AP 13 L7283-02 3/31/2004 Mn-54 -9.30E-04 7.60E-04 3.50E-03 AP 13 L7283-02 3/31/2004 Nb-95 3.1OE-03 3.20E-03 1.10E-02 AP 13 L7283-02 3/31/2004 Ru-103 -1.10E-03 2.80E-03 1.IOE-02 AP 13 L7283-02 3/31/2004 Ru-106 -6.90E-03 5.40E-03 2.60E-02 AP 13 L7283-02 3/31/2004 Sb-124 -2.60E-03 5.40E-03 2.40E-02 AP 13 L7283-02 3/31/2004 Sb-125 0.00E+00 1.70E-03 6.70E-03 AP 13 L7283-02 3/31/2004 Sc-75 -1.30E-03 1.IOE-03 4.50E-03 AP 13 L7283-02 3/31/2004 Zn-65 -1.80E-03 1.40E-03 7.40E-03 AP 13 L7283-02 3/31/2004 Zr-95 -5.70E-03 3.20E-03 1.50E-02 AP 13 L7269-02 4/13/2004 GROSS BETA 1.35E-02 1.10E-03 2.80E-03

• AP 13 L7381-02 4/28/2004 GROSS BETA 2.34E-02 1.90E-03 3.70E-03

• AP 13 L7758-02 5/12/2004 GROSS BETA 2.15E-02 2.30E-03 5.SOE-03

• AP 13 L7768-02 5/26/2004 GROSS BETA 1.81E-02 1.90E-03 4.00E-03

• AP 13 L7769-02 6/8/2004 GROSS BETA 9.90E-03 1.20E-03 3.40E-03

• AP 13 L7770-02 6/22/2004 GROSS BETA 1.84E-02 2.00E-03 4.70E-03 *

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-33

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP 13 L7771-02 7/6/2004 GROSS BETA 1.76E-02 2.20E-03 5.60E-03 AP 13 L7879-02 7/6/2004 AcTh-228 2.80E-03 2.40E-03 8.40E-03 AP 13 L7879-02 7/6/2004 Ag-lOSm -1.70E-04 4.60E-04 1.80E-03 AP 13 L7879-02 7/6/2004 Ag-l lOm -7.OOE-04 1.20E-03 4.70E-03 AP 13 L7879-02 7/6/2004 Ba-140 -1.80E-02 2.90E-02 1.30E-01 AP 13 L7879-02 7/6/2004 Be-7 1.08E-01 2.OOE-02 4.60E-02 AP 13 L7879-02 7/6/2004 Ce-141 -2.OOE-04 2.90E-03 1.OOE-02 AP 13 L7879-02 7/612004 Cc-144 O.OOE+00 2.70E-03 9.70E-03 AP 13 L7879-02 7/6/2004 Co-57 7.90E-04 3.50E-04 1.10E-03 AP 13 L7879-02 7/6/2004 Co-58 -1.SOE-03 1.IOE-03 5.1OE-03 AP 13 L7879-02 7/6/2004 Co-60 S.OOE-05 7.60E-04 3.10E-03 AP 13 L7879-02 7/6/2004 Cr-51 2.60E-02 2.60E-02 8.80E-02 AP 13 L7879-02 7/6/2004 Cs-134 -2.10E-04 7.90E-04 3.1OE-03 AP 13 L7879-02 7/6/2004 Cs-137 -1.40E-03 l.lOE-03 4.40E-03 AP 13 L7879-02 7/6/2004 Fe-59 5.40E-03 4.20E-03 1.40E-02 AP 13 L7879-02 7/6/2004 1-131 5.00E-02 1.IOE-01 3.80E-01 AP 13 L7879-02 7/6/2004 K-40 -7.00E-04 9.00E-03 3.60E-02 AP 13 L7879-02 7/6/2004 la-140 -2.1OE-02 3.30E-02 1.50E-01 AP 13 L7879-02 7/612004 Mn-54 6.00E-04 6.20E-04 2.20E-03 AP 13 L7879-02 7/6/2004 Nb-95 3.OOE-03 2.90E-03 l.OOE-02 AP 13 L7879-02 7/612004 Ru-103 -1.20E-03 1.50E-03 6.50E-03 AP 13 L7879-02 7/6/2004 Ru-106 1.30E-03 5.80E-03 2.20E-02 AP 13 L7879-02 7/6/2004 Sb-124 1.20E-03 2.40E-03 l.OOE-02 AP 13 L7879-02 7/6/2004 Sb-125 -2.40E-03 1.40E-03 6.10E-03 AP 13 L7879-02 7/6/2004 Se-75 -3.1OE-04 9.20E-04 3.SOE-03 AP 13 L7879-02 7/6/2004 Zn-65 -9.00E-04 2.20E-03 8.70E-03 AP 13 L7879-02 7/6/2004 Zr-95 8.00E-04 1.80E-03 7.1OE-03 AP 13 L7857-02 7/20/2004 GROSS BETA 1.20E-02 1.30E-03 3.SOE-03 AP 13 L8319-02 7/20/2004 Aclh-228 O.OOE+00 1.30E-02 4.80E-02 AP 13 L8319-02 7/20/2004 Ag-108m -S.70E-03 2.70E-03 1.lOE-02 AP 13 L8319-02 7/20/2004 Ag- lOim 8.20E-03 5.40E-03 1.80E-02 AP 13 L8319-02 7/20/2004 Ba-140 1.30E+01 1.00E+01 3.SOE+01 AP 13 L8319-02 7/20/2004 Be-7 2.00E-01 1.40E-01 4.60E-01 AP 13 L8319-02 7/20/2004 Ce-141 1.30E-01 8.60E-02 2.90E-01 AP 13 L8319-02 7/20/2004 Ce-144 -3.40E-02 2.00E-02 7.70E-02 AP 13 L8319-02 7/20/2004 Co-57 -1.20E-03 2.30E-03 8.30E-03 AP 13 L8319-02 7/20/2004 Co-58 5.OOE-03 1.30E-02 4.80E-02 AP 13 L8319-02 7/20/2004 Co-60 -1.00E-04 3.90E-03 1.SOE-02 AP 13 L8319-02 7/20/2004 Cr-5i 2.OOE-01 9.SOE-01 3.40E+00 AP 13 L8319-02 7/20/2004 Cs-134 7.20E-03 3.70E-03 1.20E-02 AP 13 L8319-02 7/20/2004 Cs-137 -S.60E-03 3.00E-03 1.30E-02 AP 13 L8319-02 7/20/2004 Fe-59 1.22E-01 5.70E-02 1.70E-01 AP 13 L8319-02 7/20/2004 1-131 -1.20E+03 1.00E+03 3.80E+03 AP 13 L8319-02 7/20/2004 K-40 -8.00E-03 3.50E-02 1.40E-01 AP 13 L8319-02 7/20/2004 La-140 1.60E+01 1.20E+01 4.1 OE+OI

• Radioactivity detected in sample (ie., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-34

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCim3) (pCi/m3) (pCi/m3)

AP 13 Ls8319-02 7/20/2004 Mn-54 -3.OOE-03 4.20E-03 1.70E-02 AP 13 L8319-02 7/20/2004 Nb-95 9.90E-02 9.20E-02 3.10E-01 AP 13 L8319-02 7/20/2004 Ru-103 2.10E-02 3.50E-02 1.20E-O1 AP 13 L8319-02 7/20/2004 Ru-106 3.60E-02 3.90E-02 1.30E-01 AP 13 L8319-02 7/20/2004 Sb-124 O.OOE+00 4.70E-02 1.s90E-01 AP 13 18319-02 7/20/2004 Sb-125 -1.83E-02 9.40E-03 3.80E-02 AP 13 18319-02 7/20/2004 Se-75 -7.20E-03 7.60E-03 2.80E-02 AP 13 L8319-02 7/20/2004 Zn-65 8.30E-03 9.80E-03 3.1OE-02 AP 13 L8319-02 7/20/2004 Zr-95 3.1OE-02 2.50E-02 8.50E-02 AP 14 L6800-03 1/7/2004 GROSS BETA 3.08E-02 1.60E-03 3.40E-03

• AP 14 L6851-03 1/22/2004 GROSS BETA 2.44E-02 1.50E-03 3.50E-03 AP 14 L6928-03 2/4/2004 GROSS BETA 2.13E-02 1.50E-03 3.50E-03

• AP 14 L6995-03 2/18/2004 GROSS BETA 2.81E-02 2.40E-03 6.1OE-03

• AP 14 L7038-03 3/3/2004 GROSS BETA 3.04E-02 1.70E-03 3.30E-03

• AP 14 L7102-03 3/16/2004 GROSS BETA 2.30E-02 1.70E-03 4.00E-03 AP 14 1.7180-03 3/31/2004 GROSS BETA 2.89E-02 2.20E-03 4.30E-03

• AP 14 L7283-03 3/31/2004 AcTh-228 -1.60E-03 2.80E-03 1.20E-02 AP 14 L7283-03 3/31/2004 Ag-108m 2.60E-04 4.90E-04 1.80E-03 AP 14 L7283-03 3/31/2004 Ag-llOm 2.00E-04 1.20E-03 4.90E-03 AP 14 L7283-03 3/31/2004 Ba-140 1.80E-02 3.10E-02 1.30E-01 AP 14 L7283-03 3/31/2004 Bc-7 7.10E-02 2.90E-02 9.OOE-02 AP 14 L7283-03 3/31/2004 Ce-141 5.70E-03 3.80E-03 1.30E-02 AP 14 L7283-03 3/31/2004 Ce-144 5.1OE-03 3.70E-03 1.20E-02 AP 14 L7283-03 3/31/2004 Co-57 6.50E-04 4.30E-04 1.40E-03 AP 14 L7283-03 3/31/2004 Co-58 -1.80E-03 1.60E-03 7.40E-03 AP 14 L7283-03 3/31/2004 Co-60 1. IOE-03 1.20E-03 4.50E-03 AP 14 L7283-03 3/31/2004 Cr-51 3.20E-02 3.50E-02 1.20E-01 AP 14 L7283-03 3/31/2004 Cs-134 -4.20E-04 8.30E-04 3.70E-03 AP 14 L7283-03 3/31/2004 Cs-137 3.00E-04 1.70E-03 6.10E-03 AP 14 L7283-03 3/31(2004 Fe-59 -1.80E-03 6.OOE-03 2.50E-02 AP 14 L7283-03 3/31/2004 1-131 -5.90E-01 1.90E-01 9.OOE-01 AP 14 L7283-03 3/31/2004 K-40 -2.1 OE-02 1.30E-02 6.00E-02 AP 14 L7283-03 3/31/2004 La-140 2.OOE-02 3.50E-02 1.501E-01 AP 14 L7283-03 3/31/2004 Mn-54 1.60E-04 8.60E-04 3.40E-03 AP 14 L7283-03 3/31/2004 Nb-95 -4.10E-03 4.00E-03 1.70E-02 AP 14 L7283-03 3/31/2004 Ru-103 7.00E-04 2.40E-03 9.20E-03 AP 14 L7283-03 3/31/2004 Ru-106 7.90E-03 7.90E-03 2.80E-02 AP 14 L7283-03 3/31/2004 Sb-124 -2.00E-04 3.30E-03 1.70E-02 AP 14 L7283-03 3/31/2004 Sb-125 -2.SOE-03 2.00E-03 8.50E-03 AP 14 L7283-03 3/31/2004 Sc-75 -2.00E-04 1.20E-03 4.60E-03 AP 14 L7283-03 3/31/2004 Zn.65 -2.10E-03 2.30E-03 1.IOE-02 AP 14 L7283-03 3/31/2004 Zr-95 -4.60E-03 3.60E-03 1.60E-02 AP 14 L7269-03 4/13/2004 GROSS BETA 1.57E-02 3.00E-03 9.OOE-03 AP 14 L7381-03 4/28/2oo4 GROSS BETA 2.20E-02 1.901E-03 4.00E-03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower LUmit of Detection Requirement A-35

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP 14 L7758-03 5/12/2004 GROSS BETA 2.22E-02 2.30E-03 5.80E-03 AP 14 L7768-03 5127/2004 GROSS BETA 1.58E-02 1.80E-03 4.00E-03 AP 14 L7769-03 6/812004 GROSS BETA 1.03E-02 1.30E-03 3.80E-03 AP 14 L7770-03 6/22/2004 GROSS BETA 1.80E-02 2.1OE-03 5.00E-03 AP 14 L7771-03 7/6/2004 GROSS BETA 1.96E-02 2.30E-03 5.90E-03 AP 14 L7879-03 7/6/2004 AcTh-228 l.00E-04 2.1 OE-03 8.70E-03 AP 14 L7879-03 7/6/2004 Ag-lOSm 6.90E-04 5. 1OE-04 1.70E-03 AP 14 L7879-03 7/6/2004 Ag-I lOIm 4.10E-04 8.40E-04 3.30E-03 AP 14 L7879-03 7/6/2004 Ba-140 4.20E-02 3.00E-02 9.70E-02 AP 14 L7879-03 7/6/2004 Be-7 8.10E-02 2.30E-02 6.40E-02 AP 14 L7879-03 7/6/2004 Ce-141 5.OOE-04 3.40E-03 1.20E-02 AP 14 L7879-03 7/6/2004 Ce-144 6.00E-04 3.30E-03 1.20E-02 AP 14 L7879-03 7/6/2004 Co-57 -1.60E-04 4.30E-04 1.60E-03 AP 14 L7879-03 7/6/2004 Co-58 -1 .00E-03 1.40E-03 6.00E-03 AP 14 L7879-03 7/6/2004 Co-60 5.00E-05 8.90E-04 3.60E-03 AP 14 L7879-03 7/6/2004 Cr-51 -9.OOE-03 2.80E-02 1.IOE-0I AP 14 L7879-03 7/6/2004 Cs-134 -1.38E-03 7.30E-04 3.50E-03 AP 14 L7879-03 7/6/2004 Cs-137 -1.60E-03 1.30E-03 5. 1OE-03 AP 14 L7879-03 7/6/2004 Fe-59 3.80E-03 3.30E-03 1.20E-02 AP 14 L7879-03 7/6/2004 1-131 -1.14E-01 9. 10E-02 3.90E-0 I AP 14 L7879-03 7/6/2004 K-40 1.40E-02 1.IOE-02 3.70E-02 AP 14 L7879-03 7/6/2004 La-140 4.80E-02 3.40E-02 1.IOE-0I AP 14 L7879-03 7/6/2004 Mn-54 -9.20E-04 7.60E-04 3.40E-03 AP 14 L7879-03 7/6/2004 Nb-95 3.00E-03 3.OOE-03 1.IOE-02 AP 14 L7879-03 7/6/2004 Ru-103 1.40E-03 2.40E-03 8.80E-03 AP 14 L7879-03 7/6/2004 Ru-106 -5.80E-03 7.20E-03 2.90E-02 AP 14 L7879-03 7/6/2004 Sb-124 -3.90E-03 5.20E-03 2.30E-02 AP 14 L7879-03 7/6/2004 Sb-125 -1.30E-03 1.60E-03 6.50E-03 AP 14 L7879-03 7/6/2004 Se-75 6.00E-04 1.20E-03 4.40E-03 AP 14 L7879-03 7/6/2004 Zn-65 -1.OOE-03 2.20E-03 9.1 OE-03 AP 14 L7879-03 7/6/2004 Zr-95 3.20E-03 3.10E-03 1.1 OE-02 AP 14 L7857-03 7/20/2004 GROSS BETA 1.14E-02 1.40E-03 3.70E-03 AP 14 L8319-03 7/20/2004 AcTh-228 4.70E-02 2.20E-02 6.30E-02 AP 14 L8319-03 7/20/2004 Ag-lOSm 3.20E-03 4.90E-03 1.80E-02 AP 14 L8319-03 7/20/2004 Ag-I lOm 4.90E-03 9.60E-03 3.90E-02 AP 14 L8319-03 7/20/2004 Ba-140 0.00E+00 2.10E+0I 9.20E+01 AP 14 L8319-03 7/20/2004 Be-7 -1.40E-01 2.90E-01 1.20E+00 AP '4 L8319-03 7/20/2004 Ce-141 -8.00E-02 1.20E-01 4.80E-01 AP 14 L8319-03 7/20/2004 Cc-144 -3.00E-03 3.30E-02 1.20E-01 AP 14 L8319-03 7/20/2004 Co-57 8.20E-03 5.20E-03 1.70E-02 AP 14 18319-03 7/20/2004 Co-58 4.90E-02 2.SOE-02 7.20E-02 AP 14 L8319-03 7/20/2004 Co-60 5.90E-03 9.60E-03 3.60E-02 AP 14 L8319-03 7/20/2004 Cr-51 2.60E+00 1.70E+00 5.40E+00 AP 14 L8319-03 n20/2004 Cs-134 5.30E-03 8.40E-03 3. 1OE-02 AP 14 L8319-03 7/20/2004 Cs-137 -8.OOE-03 1.20E-02 4.50E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower LUmit of Detection Requirement A-36

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/mn3)

AP 14 L8319-03 7/20/2004 Fe-59 7.90E-02 9.60E-02 3.701E-01 AP 14 L8319-03 712012004 1-131 1.OOE+02 1.40E+03 5.50E+03 AP 14 18319-03 7/20/2004 K40 -6.00E-02 9.I1OE-02 4.00E-01 AP 14 18319-03 7/20/2004 La-140 0.00E+00 2.401E+0 1 1.IO0E+02 AP 14 18319-03 7/2012004 Mn-54 L.001E-03 6.5013-03 2.70E-02 AP 14 L8319-03 712012004 Nb-95 1.30E-0I 1.20E-01 4.20E-01 AP 14 18319-03 7/20/2004 Ru-103 -6.60E-02 7.80E-02 3.201E-01 AP 14 L8319-03 7/20/2004 Ru-106 -1.80E-02 6.90E-02 2.80E-01 AP 14 18319-03 712012004 Sb-124 3.40E-02 6.601E-02 2.8013-01 AP 14 L8319-03 7/2012004 Sb-125 -4.00E-03 I1.70E3-02 6.70E-02 AP 14 18319-03 7120/2004 Se-75 L.OOE-03 1.201E-02 4.50E-02 AP 14 L8319-03 7/2012004 Zn-65 0.OOE+00 2.90E-02 1.IOE1-01I AP 14 18319-03 7120/2004 Z-95 S.40E-02 4.2013-02 I1.40E-01 AP 16 L6800-04 17/2004 GROSS BErA 3.02E-02 1.90E-03 4.40E-03

• AP 16 L6851-04 112212004 GROSS BETA 2.52E-02 1.90E-03 4.80E-03

• AP 16 L6928-04 2/412004 GROSS BETA 2.84E-02 2.OOE-03 4.60E-03

• AP 16 L6995-04 2/18/2004 GROSS BETA 3.74E-02 2.20E-03 4.80E-03

• AP 16 L7038-04 3/312004 GROSS BETA 3.55E-02 2.10E-03 4.10E-03

• AP 16 L7102-04 3/16/2004 GROSS BETA 2.45E-02 2.1 OE-03 5.40E-03

• AP 16 L7180-04 3/31/2004 GROSS BETA 2.86E-02 2.60E-03 S.60E-03 I AP 16 L7283-04 3/3112004 AcTh-228 -2.00E-03 4.OOE-03 1.70E-02 AP 16 L7283-04 3/3112004 Ag-lOSm -4.90E-04 5.80E-04 2.60E-03 AP 16 L7283-04 3/3112004 Ag-1Orm -2.1 OE-03 L.50E-03 7.30E-03 AP 16 L7283-04 3/31/2004 Ba-140 -6.60E-02 5.80E-02 2.90E-01 AP 16 L7283-04 3/3112004 Bc-7 7.30E-02 3.00E-02 8.90E-02 AP 16 L7283-04 3/31/2004 Ce-141 3.60E-03 5. IOE-03 1.80E-02 AP. 16 L7283-04 3/3112004 Ce-144 1.02E-02 4.20E-03 1.30E-02 AP 16 L7283-04 3/3112004 Co-57 2.60E-04 5.60E-04 2.00E-03 AP 16 L7283-04 3/31/2004 Co-5B 2.30E-03 L.SOE-03 4.70E-03 AP 16 L7283-04 3/31/2004 Co-60 1.30E-03 1.20E-03 4.20E-03 AP 16 L7283-04 3/3112004 Cr-sI -7.1 OE-02 4.50E-02 1.90E-01 AP 16 L7283-04 3/3112004 Cs-134 -1.OOE-03 1.40E-03 5.80E-03 AP 16 L7283-04 3/31/2004 Cs-137 1.30E-03 2.10E-03 7.20E-03 AP 16 L7283-04 3/3112004 Fe-59 0.OOE+00 7.70E-03 3. 1OE-02 AP 16 L7283-04 3/31/2004 1-131 3.20E-01 2. 1OE-0I 6.80E-01 AP 16 L7283-04 313112004 K-40 -3.50E-02 1.50E-02 7.40E-02 AP 16 L7283-04 3/31/2004 La-140 -7.60E-02 6.70E-02 3.30E-0O AP 16 L7283-04 3/3112004 Mn-54 -1.80E-03 1.30E-03 5.90E-03 AP 16 L7283-04 3/3112004 Nb-95 -2.20E-03 4.50E-03 1.90E-02 AP 16 L7283-04 3/3112004 Ru-103 -4.90E-03 3.20E-03 I.SOE-02 AP 16 L7283-04 3/3112004 Ru-106 1.22E-02 8. IOE-03 2.60E-02 AP 16 L7283-04 3/31/2004 Sb-124 -5.OOE-04 5.70E-03 2.70E-02 AP 16 L7283-04 3/3112004 Sb-125 3.1OE-03 2.40E-03 8.30E-03 AP 16 L7283-04 3/3112004 Se-75 1.30E-03 1.60E-03 5.SOE-03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-37

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP 16 L7283-04 3/31/2004 Znb5 -1.70E-03 2.80E-03 1.20E-02 AP 16 L7283-04 3/31/2004 Zr-95 -6.50E-03 3.70E-03 1.80E-02 AP 16 L7269-04 4/13/2004 GROSS BETA 1.87E-02 1.60E-03 3.90E-03 AP 16 L7381-04 4/28/2004 GROSS BETA 2.40E-02 2.40E-03 5.30E-03 AP 16 L7758-04 5/12/2004 GROSS BETA 2.02E-02 2.90E-03 7.60E-03 AP 16 L7768-04 5/26/2004 GROSS BETA 1.96E-02 2.40E-03 5.70E-03 AP 16 L7769-04 6/8/2004 GROSS BETA I.OOE-02 1.60E-03 4.80E-03 AP 16 L7770-04 6/22/2004 GROSS BETA 2.15E-02 2.70E-03 6.70E-03 AP 16 L7771-04 7/6/2004 GROSS BETA 2.50E-02 3. 1OE-03 8.OOE-03 AP 16 L7879-04 7/6/2004 AcTh-228 1.00E-04 3.20E-03 1.30E-02 AP 16 L7879-04 7/6/2004 Ag-108m 9.50E-04 7.70E-04 2.60E-03 AP 16 L7879-04 7/6/2004 Ag-I lOm -1.OOE-04 1.20E-03 5.00E-03 AP 16 L7879-04 716/2004 Ba-140 -5. 1OE-02 3.10E-02 1.70E-01 AP 16 L7879-04 7/6/2004 Be-7 5.70E-02 2.40E-02 7.60E-02 AP 16 L7879-04 7/6/2004 Cc-141 3.00E-03 3.90E-03 1.40E-02 AP 16 L7879-04 7/6/2004 Ce-144 4.80E-03 4. 1OE-03 1.40E-02 AP 16 L7879-04 7/6/2004 Co-57 S. IOE-04 4.70E-04 1.60E-03 AP 16 L7879-04 7/6/2004 Co-58 -2.00E-04 1.30E-03 5.50E-03 AP 16 L7879-04 7/6/2004 Co-60 1.00E-04 1.20E-03 4.80E-03 AP 16 L7879-04 7/6/2004 Cr-51 -4.80E-02 3.40E-02 1.40E-01 AP 16 L7879-04 7/6/2004 Cs-134 -6.80E-04 8.80E-04 3.80E-03 AP 16 L7879-04 7/6/2004 Cs-137 2.00E-04 1.70E-03 6.10E-03 AP 16 L7879-04 7/6/2004 Fe-59 0.OOE+00 5.30E-03 2.20E-02 AP 16 L7879-04 7/6/2004 1-131 -1.90E-01 1.30E-01 5.40E-01 AP 16 L7879-04 7/6/2004 K-40 5.00E-03 1.20E-02 4.60E-02 AP 16 L7879-04 7/6/2004 La-140 -5.90E-02 3.60E-02 1.90E-01 AP 16 L7879-04 7/6/2004 Mn-54 -8.00E-04 1.IOE-03 4.40E-03 AP 16 L7879-04 7/6/2004 Nb-95 2.00E-03 3.20E-03 1.20E-02 AP 16 L7879-04 7/6/2004 Ru-103 -1.IOE-03 3.00E-03 1.20E-02 AP 16 L7879-04 7/6/2004 Ru-106 7.101E-03 8.00E-03 2.80E-02 AP 16 L7879-04 7/6/2004 Sb-124 -3.00E-04 4.00E-03 1.90E-02 AP 16 L7879-04 7/6/2004 Sb-125 I.IOE-03 2.30E-03 8.20E-03 AP 16 L7879.04 7/6/2004 Se-75 3.10E-03 1.20E-03 3.60E-03 AP 16 L7879-04 7/6/2004 Zn-65 -7.00E-03 2.SOE-03 1.20E-02 AP 16 L7879-04 7/6/2004 Zr-95 -3.00E-03 2.80E-03 1.30E-02 AP 16 L7857-04 7/20/2004 GROSS BETA I .54E-02 1.90E-03 5. IOE-03 AP 16 L83 19-04 7/20/2004 AcTh-228 -9.00E-03 I.50E-02 5.60E-02 AP 16 L83 19-04 7/20/2004 Ag-108m I.00E-03 2.80E-03 I.OOE-02 AP 16 L83 19-04 7/20/2004 Ag-l1lm -1.72E-02 6.90E-03 3. 10E-02 AP 16 L83 19-04 7/20/2004 1Ba-140 4.20E+O I 2.20E+0I 6.90E+01 AP 16 L83 19-04 7/20/2004 Be-7 2.10E-0I 2.00E-01 6.70E-01 AP 16 L8319-04 7/20/2004 Ce-141 6.00E-02 1.30E-01 4.40E-0I AP 16 L8319-04 7/20/2004 Ce-144 2.40E-02 2.40E-02 8.20E-02 AP 16 L,83 19-04 7/20/2004 Co-57 4.00E-04 2.70E-03 9.60E-03 AP 16 L83 19-04 7/20/2004 Co-58 -9.OOE-03 1.40E-02 S.70E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-38

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/rn3)

AP 16 L8319-04 7/20/2004 CO-60 1.70E-03 3.90E-03 1.50E-02 AP 16 L[8319-04 7/20/2004 Cr-51 1.50E+00 1.40E+00 4.70E+00 AP 16 L83 19-04 7/20/2004 Cs-134 1.30E-03 3.60E-03 1.30E-02 AP 16 L83 19-04 7/20/2004 Cs-137 3.50E-03 3.40E-03 1.20E-02 AP 16 L83 19-04 7/20/2004 Fc-59 -4.50E-02 9.00E-02 3.50E-01 AP 16 L[8319-04 7/20/2004 1-131 -2.70E+03 3.20E+03 1.20E+04 AP 16 L8319-04 7/20/2004 K40 -9.70E-02 4.1OE-02 1.90E-01 AP 16 L[8319-04 7/20/2004 La-140 4.90E+01 2.60E+01 8.00E+01 AP 16 L[8319-04 7/20/2004 Mn-54 5.40E-03 5.70E-03 2.00E-02 AP 16 L[8319-04 7/20/2004 Nb-95 -1.42E-01 8.50E-02 3.40E-01 AP 16 L8319-04 7/20/2004 Ru-103 -3.lOE-02 5.40E-02 2.00E-01 AP 16 L8319-04 7/20/2004 Ru-106 6.50E-02 4.80E-02 1.60E-01 AP 16 L8319-04 7/20/2004 Sb-124 -3.90E-02 5.00E-02 2.20E-01 AP 16 L[8319-04 7/20o2oo4 Sb-125 -1.40E-02 8.70E-03 3.50E-02 AP 16 L[8319-04 7/20/2004 Se-75 -3.00E-03 I.OOE-02 3.60E-02 AP 16 L[8319-04 7/20/2004 Zn-65 -2.20E-02 1.30E-02 5.30E-02 AP 16 L[8319-04 7/20/2004 Zr-95 -6.50E-02 3.00E-02 1.30E-01 AP 29 L6800-05 1n/2004 GROSS BETA 2.93E-02 1.50E-03 3.00E-03

• AP 29 L6851-05 1/22/2004 GROSS BETA 2.19E-02 1.40E-03 3.30E-03 AP 29 L6928-05 2/4/2004 GROSS BETA 2.12E-02 1.40E-03 3.20E-03 AP 29 L6995-05 2/18/2004 GROSS BETA 2.37E-02 1.40E-03 3.20E-03 AP 29 L7038-05 3/3/2004 GROSS BETA 2.95E-02 1.50E-03 2.80E-03 AP 29 L7102-05 3/16/2004 GROSS BETA 1.84E-02 1.40E-03 3.50E-03 AP 29 .7180-05 3/31/2004 GROSS BETA 2.14E-02 1.80E-03 3.60E-03 AP 29 L7283-05 3/31/2004 AcTh-228 7.00E-04 2.40E-03 9.50E-03 AP 29 L7283-05 3/31/2004 Ag-lOSm 9.80E-04 6.40E-04 2. 1OE-03 AP 29 L7283-05 3/31/2004 Ag-I lOm -4.60E-04 9.80E-04 4.40E-03 AP 29 L7283-05 3/31/2004 Ba-140 -1.SOE-02 2.60E-02 1.40E-0I AP 29 L7283-05 3/31/2004 Be-7 6.70E-02 2. 1OE-02 6.00E-02 AP 29 L7283-05 3/31/2004 Cc-141 3.20E-03 3.50E-03 1.20E-02 AP 29 L7283-05 3/31/2004 Ce-144 3.00E-04 3.20E-03 1.20E-02 AP 29 L7283-05 3/31/2004 Co-57 -4.103E-04 3.70E-04 1.50E-03 AP 29 L7283-05 3/31/2004 Co-58 6.00E-04 1.30E-03 5.20E-03 AP 29 L7283-05 3/31/2004 Co-60 -5.1OE-04 7.20E-04 3.40E-03 AP 29 L7283-05 3/31/2004 Cr-51 9.00E-03 2.80E-02 1.00E-0I AP 29 L7283-05 3/31/2004 Cs-134 -5.90E-04 7.30E-04 3.30E-03 AP 29 L7283-05 3/31/2004 Cs-137 -9.00E-04 1.20E-03 4.60E-03 AP 29 L7283-05 3/31/2004 Fe-59 O.OOE+00 3.70E-03 1.60E-02 AP 29 L7283-05 3/31/2004 1-131 O.OOE+00 1.60E-01 6. 10E-0I AP 29 L7283-05 3/31/2004 K-40 -4.54E-02 9.30E-03 5.SOE-02 AP 29 L7283-05 3/31/2004 La-140 -1.70E-02 2.90E-02 1.60E-01 AP 29 L7283-05 3/31/2004 Mn-54 5.40E-04 7.20E-04 2.70E-03 AP 29 L7283-05 3/31/2004 Nb-95 -9.00E-04 2.50E-03 1.IOE-02 AP 29 L7283-05 3/31/2004 Ru-103 4.90E-03 3.00E-03 1.30E-02

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-39

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi'm3) (pCi/m3)

AP 29 L7283-05 3/31/2004 Ru-106 3.30E-03 5.20E-03 2.00E-02 AP 29 L7283-05 3/31/2004 Sb-124 -2.00E-03 2.00E-03 1.40E-02 AP 29 L7283-05 3/31/2004 Sb-125 -3.OOE-04 2.1OE-03 7.80E-03 AP 29 L7283-05 3/31/2004 Se-75 4.40E-04 8.80E-04 3.20E-03 AP 29 L7283-05 3131/2004 zn-65 0.00E+00 8.30E-04 4.30E-03 AP 29 L7283-05 3/31/2004 Zr-95 2.00E-03 2.30E-03 8.60E-03 AP 29 L7269-05 4/13/2004 GROSS BETA 1.19E-02 L.OOE-03 2.soE-03

• AP 29 L7381-05 4/28/2004 GROSS BETA 1.80E-02 1.60E-03 3.30E-03

• AP 29 L7758-05 5/12/2004 GROSS BETA 1.70E-02 1.90E-03 4.60E-03

• AP 29 L7768-05 5/26/2004 GROSS BETA 1.51E-02 1.60E-03 3.70E-03

• AP 29 L7769-05 6/8/2004 GROSS BETA 9.90E-03 .IOE-03 3.00E-03

• AP 29 L7770-05 6/22/2004 GROSS BETA 1.65E-02 1.801E-03 4.30E-03 AP 29 L7771-05 7/6/2004 GROSS BETA 1.8sE-02 2.00E-03 S.IOE-03

• AP 29 L7879-05 7/6/2004 AcTh-22S -9.OOE-04 2.00E-03 8.30E-03 AP 29 L7879-05 7/6/2004 Ag-lOSm -3.OOE-04 4.40E-04 1.70E-03 AP 29 L7879-05 7/6/2004 Ag-I1Om 6.30E-04 9.OE-04 3.40E-03 AP 29 L7879-05 7/6/2004 Ba-140 s.OOE-03 1.40E-02 6.00E-02 AP 29 L7879-0s 7/6/2004 Bc-7 7.90E-02 2.00E-02 5.50E-02 AP 29 L7879-05 7/6/2004 Cc-141 -3.30E-03 2.70E-03 LOOE-02 AP 29 L7879-05 7/6/2004 Ce-144 2.30E-03 2.70E-03 9.IOE-03 AP 29 L7879-05 7/6/2004 Co-57 -6.20E-04 3.40E-04 1.30E-03 AP 29 L7879-05 7/6/2004 co-ss I .80E-03 1.00E-03 3.1 OE-03 AP 29 L7879-05 7/6/2004 Co-60 4.10E-04 6.90E-04 2.60E-03 AP 29 L7879-05 7/6/2004 cr-SI 1.50E-02 2.40E-02 8.50E-02 AP 29 L7879-0s 7/6/2004 Cs-134 I.901E-04 5.90E-04 2.30E-03 AP 29 L7879-05 7/6/2004 Cs-137 2.00E-04 1.1OE-03 3.soE-03 AP 29 L7879-05 7/6/2004 Fe-59 1.90E-03 3.1 OE-03 1.20E-02 AP 29 L7879-05 7/6/2004 1-131 -3.00E-02 9.20E-02 3.50E-0I AP 29 L7879-05 7/6/2004 K-40 1.66E-02 9.IOE-03 2.90E-02 AP 29 L7879-05 7/6/2004 La-140 9.00E-03 1.60E-02 6.90E-02 AP 29 L7879-05 7/6/2004 Mn-54 -7.00E-04 6.20E-04 2.70E-03 AP 29 L7879-05 7/6/2004 Nb-95 3.1OE-03 2.soE-03 9.60E-03 AP 29 L7879-05 7/6/2004 Ru-103 4.20E-03 1.80E-03 s.20E-03 AP 29 L7879-05 7/6/2004 Ru-106 -I.IOE-03 6.50E-03 2.50E-02 AP 29 L7879-05 7/6/2004 Sb-124 1.20E-03 1.20E-03 3.301E-03 AP 29 L7879-05 7/6/2004 Sb-125 -7.00E-04 1.30E-03 5.00E-03 AP 29 L7879-05 7/6/2004 se-75 -3.soE-04 7.90E-04 3.00E-03 AP 29 L7879-05 7/6/2004 Zn-65 -3.60E-03 2.1OE-03 9.00E-03 AP 29 L7879-05 7/6/2004 Zr-95 O.OOE+00 2.1 OE-03 8.40E-03 AP 29 L7857-05 7/20/2004 GROSS BETA L.OIE-02 1.20E-03 3.20E-03 AP 29 L8319-05 7/20/2004 AcTh-228 3.60E-02 2.20E-02 7.101E-02 AP 29 L8319-05 7/20/2004 Ag-lOSm -3.80E-03 4.80E-03 2.00E-02 AP 29 L8319-05 7/20/2004 Ag-lOrm -L.OOE-03 L.00E-02 4.40E-02 AP 29 L8319-05 7/20/2004 Ba-140 -1.50E+01 1.50E+01 8.IOE+0I AP 29 L8319-05 7/20o2oo4 Bc-7 3.00E-01 3.00E-01 1.IOE+00

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-40

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/m3) (pCi/m3) (pCi/m3)

AP 29 L8319-05 7/20/2004 Cc-141 -7.OOE-02 1.30E-01 4.90E-01 AP 29 L8319-05 7/20/2004 Cc-144 1.40E-02 3.20E-02 1.IOE-01 AP 29 L8319-05 7/20/2004 Co-57 3.80E-03 4.30E-03 1.soE-02 AP 29 L8319-05 7/20/2004 Co-58 9.00E-03 2.30E-02 9.00E-02 AP 29 L8319-05 7/20/2004 Co-60 -1.36E-02 8.20E-03 4.00E-02 AP 29 L8319-05 7/20/2004 Cr-5 1 -3.00E-01 1.30E+00 5.20E+00 AP 29 L8319-05 7/20/2004 Cs-134 9.30E-03 6.00E-03 1.901E-02 AP 29 L8319-05 7/20/2004 Cs-137 -1L.OOE-02 1.I OE-02 4. 1OE-02 AP 29 L8319-05 7/20/2004 Fe-59 -3.00E-02 1.I OE-0I 4.90E-01 AP 29 L8319-OS 7/20/2004 1-131 -3.00E+02 1.60E+03 6.101E+03 AP 29 L8319-OS 7/20/2004 K-40 -7.60E-02 6.00E-02 3. 10E-0I

,AP 29 L8319-05 7/20/2004 La-140 -1.70E+01 1.70E+0I 9.40E+01 AP 29 L8319-05 7/20/2004 Mn-54 6.00E-04 4.90E-03 2.10E-02 AP 29 L8319-05 7/20/2004 Nb-95 -2.00E-02 9.70E-02 4.00E-01 AP 29 Ls3 19-05 7/20/2004 Ru-103 -1.50sE-02 6.00E-02 2.40E-01 AP 29 L8319-05 7/20/2004 Ru-106 O.OOE+00 7.OOE-02 2.70E-01 AP 29 L8319-05 720/2004 Sb-124 -7.00E-02 s.OOE-02 3.101E-OI AP 29 L8319-05 7/20o2oo4 Sb-125 -1.30E-02 1.8soE-02 7.20E-02 AP 29 L8319-05 7/20/2004 Se-75 9.00E-03 1.30E-02 4.50E-02 AP 29 L8319-05 7/20/2004 Zn-65 -1.20E-02 2.40E-02 9.90E-02 AP 29 L8319-05 7/20/2004 Zr-95 5.60E-02 4.70E-02 1.60E-01

• Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-41

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

CA 11 L7851-01 7/20/2004 AcTh-228 -7.00E+00 3.SOE+01 1.301E+02 CA 11 L7851-01 7/20/2004 Ag-108m 8.00E-01 6.30E+00 2.301E+01 CA I1 L7851-01 7/20/2004 Ag-I lOm 0.OOE+00 1.lIOE+01 4.20E+01 CA 11 L785 I-01 7/20/2004 Ba-140 4.70E+01 3.90E+0I I1.30E+02 CA 11 L7851-01 7/20/2004 Bc-7 -3.40E+01 7.SOE+01 2.801E+02 CA 11 L7851-01 7/20/2004 Cc-141 9.OOE+00 1.80E+0I 6. 1O1+0 I CA 11 L7851-01 7/20/2004 Ce-144 -9.00E+00 4.1OE+OI 1.501E+02 CA 11 L785 1-01 7/20/2004 Co-57 -1.25E+01 4.90E+00 1.901E+01I CA I1 L785 I-01 7/20/2004 Co-58 -5.80E+00 9.00E+00 3.60E3+01 CA 11 L785 I-01 7/20/2004 Co60 1.50E+01 1.OOE+01 3.3013+01 CA I1 L785 1-01 7/20/2004 CA-51 l.OOE+01 1.IOE+02 4.001E+02 CA 11 L7851-01 7/20/2004 Cs-134 3.70E+00 6.90E+00 2.501E+01 CA 11 L785I-01 7/20/2004 Cs-137 -4. 10E+00 8.SOE+00 3.201E+01 CA 11 L7851I-01 7/20/2004 Fe-59 3.O3E+01 4.00E+01 1.40E+02 CA 11 L7851I-01 7/20/2004 1-131 -6.00E+01 8.80E+01 3.30E+02 CA 11 L7851I-01 7/20/2004 K-40 1.71E+03 2.1OE+02 4.401E+02 CA 11 L785 1-01 7/20/2004 La-140 5.40E+01 4.SOE+0I 1.50E+02 CA 11 L7851I-01 7/20/2004 Mn-54 -5.40E+00 6.90E+00 2.80E3+01 CA 11 L785 I-01 7/20/2004 Nb-95 -7.00E+00 1.40E+01 5.30E+01 CA 11 L785 I-01 7/20/2004 Ru-103 6.00E+00 1.20E+01 4.20E3+01 CA 11 L785 I-01 7/20/2004 Ru-106 1.30E+01 8.30E+0I 3.001E+02 CA I1 L7851-01 7/20/2004 Sb-124 -2.60E+01 2.00E+01 9.60E+01

_^

CA 11 L785 I-01 7/20/2004 Sb-125 -3.00E+00 1.90E+01 7.20E+01 CA 11 L785 I-01 7/20/2004 Se-75 -1.52E+01 9.80E+00 3.70E+01 CA 11 L7851I-01 7/20/2004 Zn-65 8.80E+01 3. 1OE+OI 9.30E+01 CA 11 L7851-01 7/20/2004 Zr-95 -8.00E+00 1.60E+01 6. 1O1+01I CA 11 L805 1-01 9/13/2004 AcTh-228 -4.00E+00 4.70E+01 2.OOE+02 CA 11 L8051-01 9/13/2004 Ag-lOSm 1. lOE+OI 1.20E+01 4.30E3+01 CA 11 L805 1-01 9/13/2004 Ag-I lOm -1.20E+01 2.40E+0I 1.OOE+02 CA I1 L805 I-01 9/13/2004 Ba-140 -1.80E+01 3.101E+01 I1.701E+02 CA I1 L805 I-01 9/13/2004 Be-7 0.OOE+00 1.30E+02 5.30E+02 CA 11 L805I-01 9/13/2004 Cc-141 3.60E+01 2.00E+01 6.30E+01 CA I1 L805 I-01 9/13/2004 Ce-144 1.30E+01 5.40E+01 2.OOE+02 CA II L805 I-01 9/13/2004 Co-57 -2.10E+00 6.30E+00 2.50E+01 CA 11 L805 I-01 9/13/2004 Co-58 -I.50E+01 1.80E+01 7.90E+01 CA 11 L805 I-01 9/13/2004 Co-60 1.80E+01 1.00E+01 I1.60E+01 CA II L8051-01 9/13/2004 CA-51 0.00E+00 1.20E+02 4.7013+02 CA 11 L805 I-01 9/13/2004 Cs-134 -3.00E+00 I.50E+0I 6.60E+01 CA 11 L805 I-01 9/13/2004 Cs-137 -1.30E+01 l.SOE+0I 6.60E+01 CA I1 L805 I-01 9/13/2004 Fe-59 -6.60E+01 3.soE+01 2.30E+02 CA 11 L805 I-01 9/13/2004 1-131 2.60E+01 4.30E+01 I1.60E+02 CA 11 L805 I-01 9/13/2004 K40 1.69E+03 3.70E+02 7.1 OE+02 CA 11 L805 I-01 9/13/2004 La-140 -2.10E+01 3.60E+0I 1.90E+02 CA 11 L8051 -01 9/13/2004 Mn-54 -3.00E+00 1.40E+01 6.OOE+01

• Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-42

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

CA 11 L.805I-01 9/1 32004 Nb-95 -3.70E+01 2.301E+0I I.00E+02 CA 11 L805I-01 9/13/2004 Ru-103 3.8013+01 1.60E+01 4.50E+01 CA 11 L05 I-01 9/13/2004 Ru-106 -1. IOE+02 1.IOE+02 5.00E+02 CA 11 L805I-01 9/13/2004 Sb-124 -2.10E3+01 4.60E+01 2.20E+02 CA 11 L805I-01 9/13/2004 Sb-125 0.001E+00 3.30E+01 1.30E+02 CA 11 L805 1-01 9/13/2004 Se-75 -5.00E3+00 1.50E+01 6.00E+01 CA 11 L805 1-01 9/13/2004 Zn-65 -5.90E+01 4.60E+01 2.00E+02 CA 11 L805I-o1 9/13/2004 Zr-95 -1.60E+01 2.90E+01 1.30E+02 CA 24 L7851-02 7/20/2004 AcTh-228 1.00E3+00 2.60E+01 1.00E+02 CA 24 L7851 -02 7/202004 Ag-108m -4.501E+00 6.20E+00 2.40E+I01 CA 24 L7851-02 720/2004 Ag-I lO1m -1.20E+01 1.OOE+01 4.40E+01 CA 24 L7851-02 7/20/2004 Ba-140 -2.30E+01 3.30E+01 I.50E+02 CA 24 L7851-02 7/20/2004 Be-7 -1.20E+01 8.70E+01 3.20E+02 CA 24 L7851-02 7/20/2004 Cc-141 -4.901E+01 2.20E+01 8.50E+01 CA 24 L7851-02 7/20/2004 Cc-144 3.50E+01 3.00E+01 l.OOE+02 CA 24 L7851-02 7/20/2004 CD-57 -4.801E+00 3.30E+00 1.30E+0I CA 24 L7851-02 7/20/2004 Co-58 -1.90E+01 1.IOE+OI 4.70E+01 CA 24 L785 1-02 7/20/2004 Co-60 -1.00]E+01 9.60E+00 4.00E+01 CA 24 L7851-02 7(20/2004 CA-51 8.00E+01 1.00E+02 3.60E1+02 CA 24 L7851-02 7/20(2004 Cs-134 -2.80E+00 8.10E+00 3.20E+01 CA 24 L785 1-02 7/20/2004 Cs-137 9.7013+00 7.20E+00 2.40E+01 CA 24 L7851-02 7/20/2004 Fc-59 -2.80E3+01 4.10E+01 1.70E+02 CA 24 L785 1-02 7/20/2004 1-131 -6.70E+01 6.40E+0O 2.60E+02 CA 24 L7851-02 7/20(2004 K-40 1.48E+03 2. 1OE+02 4.00E+02 CA 24 L785 1-02 7(20/2004 La-140 -2.70E+01 3.80E+01 1.70E+02 CA 24 L7851-02 7/20/2004 Mn-54 -4. 101E+00 7.40E+00 3.00E+01 CA 24 L7851-02 7/20/2004 Nb-95 0.001E+00 1.30E+01 5.OOE+01 CA 24 L7851-02 720/2004 Ru-103 -1.501E+01 1.IOE+OI 4.50E+01 CA 24 L7851-02 7/20/2004 Ru-106 -4.801E+01 6.80E+01 2.70E+02 CA 24 L7851-02 7/20/2004 Sb-124 0.00E3+00 1.IOE+0I 5.80E+01 CA 24 L7851-02 7/20/2004 Sb-125 -8.00E+00 1.70E+01 6.70E+01 CA 24 L7851-02 7/20(2004 Se-75 3.501E+00 8.80E+00 3.10E+01 CA 24 L7851-02 7(20(2004 Zn-65 -8.OOE3+00 1.90E+01 7.60E+01 CA 24 L7851-02 7/20/2004 Zr-95 I1.401E+01 1.80E+01 6.40E+01 CA 24 L805 1-02 9/13/2004 Aclh-228 6. 1O1+01I 6.30E+01 2.20E+02 CA 24 L8051-02 9/13/2004 Ag-lOSm I1.70E+01 1.lIOE+01 3.60E+0I CA 24 L8051-02 9/13(2004 Ag-l Orm 6.OOE+00 2.1OE+OI 8.10E+OI CA 24 L8051-02 9/13/2004 Ba-140 3.10OE+01 3.80E+01 1.40E+02 CA 24 L8051-02 9/13/2004 Be-7 -3.001E+01 1.IOE+02 4.60E+02 CA 24 L8051-02 9/13/2004 Cc-141 2.201E+01 2.20E+01 7.40E+0I CA 24 L8051-02 9/13/2004 Cc-144 -4.70E+01 5.70E+01 2.20E+02 CA 24 L.8051-02 9/13/2004 Co-57 -5.3013+00 8.30E+00 3.20E+01 CA 24 L8051-02 9/13(2004 Co-58 -2. IOE+01I 1.40E+01 6.70E+01 CA 24 L.8051-02 9/13/2004 Co 60 -2.401E+01 1.60E+01 7.80E+01

• Radioactivity detected in sample (ie, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-43

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

CA 24 L8051-02 9/13/2004 Cr-51 5.00E+01 1.20E+02 4.SOE+02 CA 24 L[.051-02 9/13/2004 Cs-134 2.00E+01 1.50E+01 5.20E+01 CA 24 L.051-02 9/13/2004 Cs-137 9.00E+00 1.20E+01 4.30E+01 CA 24 L8051-02 9/13/2004 Fe-59 -I.30E+01 6.20E+01 2.60E+02 CA 24 L[8051-02 9/13/2004 1-131 8.00E+01 4.90E+01 1.60E+02 CA 24 L8051-02 9/13/2004 K-40 2.122E+03 3.80E+02 6.40E+02 CA 24 L[8051-02 9/13/2004 La-140 3.60E+O I 4.40E+01 1.70E+02 CA 24 L8051-02 9/13/2004 Mn-54 -1 .90E+0I 1.30E+01 6.30E+01 CA 24 L8051-02 9/13/2004 Nb-95 1.20E+01 1.30E+01 4.90E+01 CA 24 L8051-02 9/13/2004 Ru-103 4.00E+00 1.30E+01 5.20E+01 CA 24 L8051-02 9/13/2004 Ru-106 -1.30E+02 1.20E+02 5.40E+02 CA 24 L[8051-02 9/13/2004 Sb-124 -5.30E+01 3.00E+01 I.90E+02 CA 24 L.8051-02 9/13/2004 Sb-125 -1.50E+01 3. 1OE+OI 1.30E+02 CA 24 L[8051-02 9/13/2004 Se-75 -2.101E+01 1.1 OE+0I 5.1 OE+OI CA 24 L8051-02 9/13/2004 Zn-65 -1.00IE+01 2.70E+01 1.20E+02 CA 24 L8051-02 9/13/2004 Zr-95 -1.80E+01 3.30E+0I 1.40E+02 FH 11 L7853-01 720/2004 AcTh-228 4.00E+00 2.50E+01 9.20E+01 FH 11 L7853-01 7/20/2004 Ag-108m -4.70E+00 6.10E+00 2.20E+01 FH 11 L7853-01 7/20/2004 Ag-I lOm 7.OOE+00 1.10E+01 3.80E+01 FH 11 L7853-01 7/20/2004 Ba-140 1.SOE+0I 3.10E+01 1.lOE+02 FH 11 L7853-01 7/20/2004 Be-7 2.SOE+01 7.10E+0I 2.SOE+02 FH 11 L7853-01 7/20/2004 Cc-141 2.20E+01 l.50E+01 5.IOE+OI FH 11 L7853-01 7/20/2004 Cc-144 4.70E+01 4.00E+01 1.30E+02 FH L7853-01 7/20/2004 Co-57 -1.SOE+00 5.30E+00 1.90E+01 FH I L7853-01 7/20/2004 Co-58 -1.20E+00 8.60E+00 3.20E+01 FH L7853-01 7/20/2004 CO-60 1.30E+00 7.40E+00 2.70E+01 11 FH L7853-01 7/20/2004 Cr-51 0.00E+00 1.IOE+02 3.90E+02 FH IlI L7853-01 7/20/2004 Cs-134 5.40E+00 7.80E+00 2.70E+01 FH L7853-01 7/20/2004 Cs-137 -5.60E+00 7.30E+00 2.80E+01 FH L7853-01 7/20/2004 Fe-59 2.40E+01 2.80E+01 9.80E+01 FH 11 L7853-01 7/20/2004 1-131 -1.27E+02 8.70E+01 3.30E+02 FH L7853-01 7/20/2004 K-40 3.45E+03 2.40E+02 3.80E+02 FH II L7853-01 7/20/2004 La-140 1.70E+01 3.SOE+01 1.30E+02 FH L7853-01 7/20/2004 Mn-54 -4.00E+00 7.40E+00 2.80E+0 I FH 11 II L7853-01 7/20/2004 Nb-95 6.00E+00 1.20E+01 4. 1OE+OI FH II L7853-01 7/20/2004 Ru-103 2.00E+00 1.lIOE+01 3.80E+01 FH L7853-01 7/20/2004 Ru-106 2.40E+0I 6.90E+01 2.SOE+02 FH L7853-01 7/20/2004 Sb-124 1.60E+01 1.80E+01 6.30E+01 FH L7853-01 7/20/2004 Sb-125 -3.00E+00 2.00E+01 7.OOE+01 FH II L7853-01 720/2004 Se-75 1.60E+00 8.70E+00 3.10E+0I FH L7853-01 7/20/2004 Zn-65 5.70E+01 3.20E+01 1.00E+02 FH L7853-01 7/20/2004 Zr-95 9.00E+00 1.50E+01 5.20E+01 FH II L8053-01 9/8/2004 AcTh-228 -1. IOE+01 3.60E+0I 1.30E+02 FH L8053-01 9/8/2004 Ag-lOSm -2.SOE+00 6.70E+00 2.50E+01

• Radioactivity detected in sample (i., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-44

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

FH 11 L8053-01 9/&82004 Ag-I lOm -2.00E+00 1.30E+01 5.00E+01 FH 11 L8053-01 9/8/2004 Ba-140 4.00E+0I 6.10E+01 2.20E+02 FH 11 L8053-01 9/&82004 Be-7 -1.50E+02 1.10+02 4.10E+02 FH 11 L8053-01 9/8/2004 Ce-141 -2.90E+O I 2.10E+01 7.70E+01 FH 11 L8053-01 9/8/2004 C-144 -3.90E+OI 4.80E+OI 1.70E+02 FH 11 L8053-01 9/8/2004 Co-57 -1.80E+00 5.70E+00 2.00E+01 FH 11 L8053-01 9/8/2004 CO-58 -1.00E+00 1.00E+01 3.80E+01 FH 11 L8053-01 9/8/2004 Co-60 5.00E+00 1.10+01I 3.90E+01 FH 11 L8053-01 9/8/2004 Cr-51 O.OOE+00 1.60E+02 5.60E+02 FH 11 L8053-01 9/8/2004 Cs-134 2.20E+00 8.80E+00 3.20E+01 FH 11 18053-01 9/8/2004 Cs-137 4.00E-01 9.40E+00 3.40E+01 FH 11 L8053-01 9/8/2004 Fe-59 -8.20E+01 4.10E+01 1.80E+02 FH 11 u053-01 9/8/2004 1-131 -1.50E+02 1.60E+02 6.00E+02 FH 11 L8053-01 9/8/2004 K-40 3.01E+03 2.60E+02 4.00E+02 FH 11 L8053-01 9/8/2004 La-140 4.60E+01 7.00E+01 2.50E+02 FH 11 L8053-01 9/8/2004 Mn-54 -3.00E+00 1.10E+01 4.00E+01 FH 11 L8053-01 9/8/2004 Nb-95 -3.80E+01 1.70E+01 7.10E+01 FH 11 L8053-01 9/8/2004 Ru-103 2.00E+00 1.30E+01 4.80E+01 FH 11 L8053-01 9/8/2004 Ru-106 -3.10E+01 8.20E+01 3.10E+02 FH 11 L8053-01 9/8/2004 Sb-124 -2.80E+01 2.80E+01 1.20E+02 FH 11 L8053-01 9/8/2004 Sb-125 5.00E+00 2.30E+01 8.20E+01 FH 11 L8053-01 9/8/2004 Se-75 1.902+01 1.20E+01 4. 10E+0I FH 11 L8053-01 9/8/2004 Zn-65 -9.00O+00 4.90E+01 1.70E+02 FH 11 L8053-01 9/8/2004 Zr-95 4.00E+00 2.102+01 7.60E+01 FH 24 L7853-02 7/20/2004 AcTh-228 4.00E+00 3.60E+01 1.30E+02 FH 24 L7853-02 7/20/2004 Ag-O1m -2.00E+00 7.402+00 2.70E+01 FH 24 L7853-02 7/20/2004 Ag-I lOIn O.OOE+00 1.30E+01 4.80E+01 FH 24 L7853-02 7/20/2004 Ba-140 -3.90E+O I 3.90E+01 1.80E+02 FH 24 L7853-02 7/20/2004 Be-7 -3.00E+01 1.002+02 3.70E+02 FH 24 L7853-02 7/20/2004 Ce-141 -4.50E+01 1.80E+01 6.90E+01 FH 24 L7853-02 7/20/2004 Cc-144 l.00E+00 4.30E+01 1.502+02 FH 24 L7853-02 7/20/2004 Co-57 1.10+01 5.70E+00 1.902+01 FH 24 L7853-02 7/20/2004 Co-58 I.00O+01 1.10E+01 3.70E+01 FH 24 L7853-02 7/20/2004 Co-60 -4.00E+00 1.30E+01 5.00E+01 FH 24 L7853-02 7/20/2004 Cr-51 -3.40E+02 1.30E+02 5.40E+02 FH 24 L7853-02 7/20/2004 Cs-134 2.00E+00 1.10+01 4.00E+01 FH 24 L7853-02 7/20/2004 Cs-137 -1.00E+01 1.00E+01 4.00E+01 FH 24 L7853-02 7/20/2004 Fe-59 7.00E+00 4.00E+01 1.50O+02 FH 24 L7853-02 7/20/2004 1-131 -4.00E+0I 1.00E+02 3.80E+02 FH 24 L7853-02 7/20/2004 K-40 3.71E+03 3.30E+02 5.00+02 FH 24 L7853-02 7/20/2004 la-140 -4.40E+01 4.40E+01 2.10E+02 FH 24 L7853-02 7/20/2004 Mn-54 4.40E+00 9.00E+00 3.60E+01 FH 24 L7s53-02 7/20/2004 Nb-95 9.OOE+00 1.60E+01 5.70E+01 FH 24 L7853-02 7/20/2004 Ru-103 -1.00O+01 1.30E+01 5. 10E+0I

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-45

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

F}3 24 L7853-02 7/20/2004 Ru- 106 3.90E+01 9.1 OE+01I 3.30E+02 FH 24 L7853-02 7/20/2004 Sb-124 0.QOE+00 3.20E+01 1.30E+02 FH 24 L7853-02 7/20/2004 Sb-125 -1.50E+01 2.40E+01 9.00E+01 FH 24 L7853-02 7/20/2004 Se-75 -5.00E+00 I .OOE+0l 3.80E+0I FH 24 L7853-02 7/20/2004 Zn-65 -5.70E+01 2.901E+01 1.20E+02 FH 24 L7853-02 7/20/2004 Zr-95 1.80E+01 2.001E+01 7.101E+01 FH 24 1,8053-02 9/6/2004 Aclb-228 8.00E+00 2.7013+01 9.60E+01 FH 24 L8053-02 9/6/2004 Ag-108m 5.20E+00 5.801E+00 2.00E+01 FH 24 L8053-02 9/6/2004 Ag-lOim 5.00E+00 1.001E+01 3.70E+01 FH 24 o8053-02 9/6/2004 Ba-140 -4.20E+01 4.20E+01 1.80E+02 FH 24 1,8053-02 9/6/2004 Be-7 -t.56E+02 8.30E+01 3.30E+02 FH 24 L8053-02 9/6/2004 Cc-141 2.20E+01 1.801E+0 I 5.90E+01 FH 24 L8053-02 9/6/2004 Ce-144 1.60E+01 3.7013+01 1.30E+02 FH 24 LS053-02 9s6/2004 Co-57 -1.90E+00 4.80E3+00 1.70E+01 FH 24 L8053-02 9/6/2004 Co-58 -2.151E+01 8.30E3+00 3.60E+O1 FH 24 L8053-02 9/6/2004 Co-60 1.1lIE+01 8.501E+00 2.80E+01 FH 24 L8053-02 9/6/2004 Cr-51 1.60E+02 I1.20E3+02 4.20E+02 FH 24 L8053-02 9/6/2004 Cs-134 3.00E+00 7.501E+00 2.70E+01 FH 24 L8053-02 9/6/2004 Cs-137 1.21E+01 7.50OE+00 2.50E+01 FH 24 L8053-02 9/6/2004 Fc-59 1.70E+01 2.601E+01 9.50E.+OI FH 24 L8053-02 9/6/2004 1-131 -3.00E+01 1.501E+02 5.40E+02 FH 24 L8053-02 9/6/2004 K-40 2.26E+03 2.001E+02 3.50E+02 FH 24 L8053-02 9/6/2004 La-140 -4.80E+01 4.80E3+01 2. 10E+02 FH 24 L8053-02 9/6/2004 Mn-54 -3.IOE+00 7.OOE+00 2.70E+0I FH 24 L8053-02 9/6/2004 Nb-95 5.00E+00 1.50E+01 5.30E+01 FH 24 L8053-02 9/6/2004 Ru-103 -2.10E+01 1.30E+01 5.10E+0I FH 24 L8053-02 9/6/2004 Ru-106 -1.80E+01 6.501E+01 2.40E+02 FH 24 L8053-02 9/6/2004 Sb-124 -2.00E+01 I1.90E+01 8.30E+01 FH 24 L8053-02 9/6/2004 Sb-125 8.00E+00 I1.70E+01 6.101E+01 FH 24 L8053-02 9/6/2004 Sc-75 -1.12E+01 9.20E3+00 3.40E+01 FH 24 L8053-02 916/2004 Zn-65 -1.00E+01 1.80E3+01 6.90E+0I FH 24 L8053-02 9/6/2004 Zr-95 -4.00E+01 1.701E+01 7.00E+01 HA II L7852-01 7/19/2004 AcTh-228 2.10E+0I 3.30E3+01 1.20E+02 HA 11 L7852-0 7/19/2004 Ag-108m -9.OOE-01 6.40E+00 2.40E+01 HA 11 L7852-01 7/19/2004 Ag-I lOin -1.90E+01 I.00E3+01 4.70E+01 HA 11 L7852-01 7/19/2004 Ba-140 3.70E+01 4.I1OE+01I 1.50E+02 HA 11 L7852-01 7/19/2004 Be-7 0.OOE+00 8.001E+01 3.00E+02 HA 11 1,7852-01 7/19/2004 Ce-141 -1.501E+01 I1.60E3+01 5.90E+01 HA 11 L7852-01 7/19/2004 Ce-144 6.00E+01 3.901E+01 1.30E+02 HA 11 L7852-01 7/19/2004 Co-57 2.00E+00 4.80E3+00 1.70E+01 HA 11 L7852-01 7/19/2004 Co-58 -I.03E+01 8.20E+00 3.60E+01 HA 11 L7852-01 7/19/2004 Co-60 6.30E+00 9.OOE+00 3.30E+01 HA 11 L7852-01 7/19/2004 Cr-51 3.00E+01 1.IOE1+02 4. 10E+02 HA 11 L7852-01 7/19/2004 Cs-134 6.50E+00 7.70E+00 2.80E+01

• Radioactivity detected in sample (i.e, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-46

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

HA 11 L7852-o1 7/19/2004 Cs-137 1.09E+01 7.50E+00 2.SOE+01 HA 11 L7852-O1 7/19/2004 Fe-59 -4.10E+01 3.30E+01 IL.50E+02 HA 11 L7852-01 7/19/2004 1-131 O.OOE+00 9.30E+01 3.40E+02 HA 11 L7852-01 7/19/2004 K-40 L.28E+03 2.00E+02 3.80E+02 HA 11 L7852-O1 7/19/2004 La-140 4.30E+01 4.70E+01 1.70E+02 HA II L7852-01 7/19/2004 Mn-54 1.63E+01 8.20E+00 2.50E+01 HA 11 L7852-0l 7/19/2004 Nb-95 -5.OOE+O0 1.20E+01 4.80E+01 HA 11 L7852-01 7/19/2004 Ru-103 -9.OOE+00 1.IOE+0I 4.40E+01 HA 11 L7852-O1 7/19/2004 Ru-106 8.50E+01 7.80E+01 2.70E+02 HA 11 L7852-01 7/19/2004 Sb-124 3.20E+01 2.50E+01 8.60E+01 HA 11 L7852-01 7/19/2004 Sb-125 6.OOE+00 1.90E+01 6.90E+O0 HA 11 L7852-01 7/19/2004 Se-75 -. IOE+00 8.80E+00 3.20E+01 HA 11 L7852-01 7/19/2004 Zn-65 -2.10E+01 1.90E+01 8.OOE+01 HA 11 L7852-01 7/19/2004 zr-95 -2.40E+01 1.60E+01 6.90E+01 HA 11 L052-01 9/13/2004 AcTh-228 2.70E+01 4.40E+01 1.60E+02 HA 11 L8052-01 9/13/2004 Ag-108m 3.90E+00 7.80E+00 2.90E+01 HA 11 L8052-01 9/13/2004 Ag-l lOm -5.OOE+00 1.70E+01 7.00E+0I HA II L8052-01 9/13/2004 Ba-140 4.90E+01 6.90E+01 2.60E+02 HA 11 L8052-01 9/13/2004 Be-7 1.40E+02 L.501E+02 5.30E+02 HA 11 L8052-01 9/13/2004 Ce-141 -6.OOE+01 2.70E+01 1.IOE+02 HA 11 L8052-01 9/13/2004 Ce-144 2.50E+01 6.20E+01 2.20E+02 HA 11 L8052-01 9/13/2004 Co-57 2.90E+O0 8.30E+00 2.90E+O1 HA 11 L8052-01 9/13/2004 Co-58 -5.00E+O0 1.20E+01 5.IOE+01 HA 11 L8052-01 9/13/2004 Co-60 -1.60E+01 1.60E+01 7.10E+01 HA 11 18052-01 9/13/2004 Cr-si -2.40E+02 1.90E+02 7.60E+02 HA 11 L8052-01 9/13/2004 Cs-134 -2.00E+00 1.SOE+01 6.00E+01 HA 11 L8052-01 9/13/2004 Cs-137 1.30E+01 1.IOE+OI 3.80E+0I HA 11 L8052-01 9/13/2004 Fe-59 3.90E+0I 5.50E+01 2.00E+02 HA 11 L8052-01 9/13/2004 1-131 -8.OOE+01 1.80E+02 6.80E+02 HA 11 L8052-01 9/13/2004 K-40 1.70E+03 3.00E+02 5.SOE+02 HA 11 L8052-01 9/13/2004 La-140 5.60E+01 7.90E+01 3.OOE+02 HA 11 L8052-01 9/13/2004 Mn-54 1.90E+01 1.30E+01 4.SOE+01 HA 11 L.8052-01 9/13/2004 Nb-95 2.SOE+01 1.901E+01 6.50E+01 HA 11 L.8052-01 9/13/2004 Ru-103 -3.40E+01 1.70E+01 7.90E+OI HA 11 L.8052-01 9/13/2004 Ru-106 -6.OOE+01 1.SOE+02 5.60E+02 HA 11 L8052-01 9/13/2004 Sb-124 O.OOE+00 2.20E+0I 1.IOE+02 HA 11 L.8052-01 9/13/2004 Sb-125 0.OOE+00 3.20E+01 1.20E+02 HA 11 L8052-01 9/13/2004 Se-75 1.70E+01 1.80E+01 6.20E+01 HA II L8052-01 9/13/2004 Zn-65 1.60E+01 3.40E+01 1.30E+02 HA II L8052-01 9/13/2004 Zr-95 -5.70E+01 2.70E+01 1.30E+02 HA 24 L7852-02 7/19/2004 AcTh-223 -3.00E+00 2.SOE+01 9.20E+01 HA 24 L7852-02 7/19/2004 Ag-lOSm -9.40E+00 5.20E+00 2.10E+01 HA 24 L7852-02 7/19/2004 Ag-lIOm -1.41E+01 9.80E+00 3.90E+OI HA 24 L7852-02 7/19/2004 Ba-140 -4.80E+01 3.70E+01 1.SOE+02

• Radioactivity detected In sample (i.e, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-47

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCilkg)

HA 24 L7852-02 7/19/2004 Be-7 0.00E+00 7.OOE+01I 2.50E+02 HA 24 L7852-02 7/19/2004 Ce-141 -9.OOE+00 1.60E+01 5.60E+01 HA 24 L7852-02 7/19/2004 Ce-144 -1 .601E+01 3.501E+01 I1.20E+02 HA 24 L7852-02 7/19/2004 Co-57 5.OOE3+00 4.701E+00 I1.60E+01 HA 24 L7852-02 7/19/2004 Co-58 2.40E3+00 8. IOE1+00 2.90E-i01 HA 24 L7852-02 7/19/2004 Co-60 7.501E+00 7.20E+00 2.50E-.01 HA 24 L7852-02 7/19/2004 Cr-51 5.90E+01 9.90E+01 3.40E+02 HA 24 L7852-02 7/19/2004 Cs-134 -6.30E+00 6.10OE+00 2.50E+01 HA 24 L7852-02 7/19/2004 Cs-137 -7.001E-01 6.60E+00 2.40E3+01 HA 24 L7852-02 7/19/2004 Fe-59 -2.301E+01 2.401E+0 I 9.90E3+01 HA 24 L7852-02 7/19/2004 1-131 8.00E3+00 7.90E+01 2.80E+02 HA 24 L7852-02 7/19/2004 K-40 I1.491E+03 1.60E+02 3.201E+02 HA 24 L7852-02 7/19/2004 La-140 -5.50E+01 4.201E+01 I.80E+02 HA 24 L7852-02 7/19/2004 Mn-54 -2.90E3+00 6.801E+00 2.60E+01 HA 24 L7852-02 7/19/2004 Nb-95 2.001E+00 1.OOE+01 3.80E+01 HA 24 L7852-02 7/19/2004 Ru-103 -4.00E3+00 1.I OE14 OI 3.901E+01 HA 24 L7852-02 7/19/2004 Ru-106 2.001E+01 6.60E+01 2.30E+02 HA 24 L7852-02 7/19/2004 Sb-124 4.OOE+00 1.70E+01 6.60E+01 HA 24 L7852-02 7/1912004 Sb-125 -1.301E+01 1.401E+01 5.501E+01 HA 24 L7852-02 7/19/2004 Se-75 -1.OOE3-01 8.90E3+00 3.20E3+01 HA 24 L7852-02 7/19/2004 Zn-65 -5.00OE+01 1.701E+01 7.30E3+01 HA 24 L7852-02 7/19/2004 Zr-95 8.OOE+00 I1.40E+01 5.001E+01 HA 24 L8052-02 9/13/2004 AcTh-22S -3.501E+01 4. IOE1+01I 1.80E+02 HA 24 L8052-02 9/13/2004 Ag-108m -3.901E+00 8.40E3+00 3.40E1+01 HA 24 L8052-02 9/13/2004 Ag-I lOm 3.OOE+00 1.501E+01 6.1013+01 HA 24 L8052-02 9/13/2004 Ba-140 0.001E+00 6.80E+01 3.001E+02 HA 24 L8052-02 9/13/2004 Be-7 3.OOE+01 I1.401E+02 5.401E+02 HA 24 L8052-02 9/13/2004 Cc-141 2.001E+00 1.901E+01 7.201E+01 HA 24 L8052-02 9/13/2004 Ce-144 -4.50E+01 4.401E+01 I1.801E+02 HA 24 L8052-02 9/13/2004 Co-57 O.OOE3+00 5.601E+00 2.I1OE+01I HA 24 L8052-02 9/13/2004 Co-58 -3.20E3+01 I.80E3+01 8.10OE+01 HA 24 L8052-02 9/13/2004 CO60 I1.301E+01 1.40E3+01 5.20E+01 HA 24 L8052-02 9/13/2004 Cr-51 -1.00E+01 I1.40E+02 5.501E+02 HA 24 L8052-02 9/13/2004 Cs-134 -1. IOE+01 1.30E+01 5.70E+0 I HA 24 L8052-02 9/13/2004 Cs-137 -6.001E+00 1.IOE+01I 4.601E+01 HA 24 L8052-02 9/13/2004 Fe-59 -2.60E+01 5.OOE+01 2.30E+02 HA 24 L8052-02 9/13/2004 1-131 4.OOE+01 I1.30E+02 4.80E+02 HA 24 L8052-02 9/13/2004 K-40 I1.201E+03 3.301E+02 8.60E+02 HA 24 L8052-02 9/13/2004 La-140 O.OOE3+00 7.80E+01 3.40E+02 HA 24 L8052-02 9/13/2004 Mn-54 1.301E+01 8.60E+00 2.70E+01 HA 24 L8052-02 9/13/2004 Nb-95 6.00E3+00 2.OOE+01 7.8013+01 HA 24 L8052-02 9/13/2004 Ru-103 -8.00E+00 I1.60E+01 6.701E+01I HA 24 L8052-02 9/13/2004 Ru-106 5.30E+01 7.50E+01 2.80E1e-02 HA 24 L8052-02 9/13/2004 Sb-124 -8.701E+0 I 4.601E+01 2.5OE+02 HA 24 L8052-02 9/13/2004 Sb-125 -3.OOE-I01 2.401E+01 1.IOE1+02 HA 24 18052-02 9/13/2004 Sc-75 -1 .20E+01 1.301E+01 5.10E+01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-48

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCilkg) (pCi/kg) (pCi/kg)

HA L8052-02 9/13/2004 Zn-65 -1.80E+01 3.10E+01 1.30E+02 HA L8052-02 9/13/2004 Zr-95 1.20E+01 1.90E+01 7.40E+0I MA L7849-01 6/28/2004 Ach228 4.OOE+01 3.001E+0 I I.OOE+02 MA 1,7849-01 6/28/2004 Ag-108m -I. IOE+00 7.0013+00 2.60E+01 MA L7849-01 6/28/2004 Ag-I lOm 3.001E+00 I1.401E+01 5.201E+01 MA L7849-01 6/28/2004 Ba-140 0.OOE+00 I1.20E+02 5.201E+02 MA L7849-01 6/28/2004 Be-7 -4.00OE+01 I. IOE1+02 4.301E+02 MA L7849-01 6/28/2004 Ce-141 -1.601E+01 2.901E+01 1.IOE+02 MA L7849-01 6/28/2004 Ce-144 -7.001E+00 4.601E+01 1.60E3+02 MA L7849-01 6/28/2004 Co-57 1.1 7E+01 5.90E3+00 1.901E+01 MA L7849-01 6/28/2004 CO-58 -1.70E+01 1.30E3+01 5.601E+01 MA L7849-01 6/28/2004 Co-60 1.70E+01 I. IOE+01I 3.701E+01 MA L7849-01 6/28/2004 Cr-51 8.00E+01 2.101+02 7.40E+02 MA 1,7849-01 6/28/2004 Cs-134 -1.001E+00 8.40E+O00 3.30E+01 MA 1,7849-01 6/28/2004 Cs-137 7.001E+00 1.001E+01 3.60E+01 MA 1,7849-01 6/28/2004 Fo-59 I1.801E+01 3.901E+01 1.501E+02 MA L7849-01 6/28/2004 1-131 -8.OOE3+01 5.70E3+02 2.10E+03 MA L7849-01 6/28/2004 K-40 1.50E3+03 2.101E+02 3.80E3+02*

MA L7849-01 6/28/2004 La-140 0.OOE3+00 1.401E+02 5.901E+02 MA L7849-01 6/28/2004 Mn-54 0.OOE3+00 9.90E+O0 3.80E3+01 MA L7849-01 6/28/2004 Nb-95 -2.001E+0I 2.001E+01 8.30E3+01 MA L7849-01 6/28/2004 Ru-103 3.50OE+01 2.OOE+01 6.401E+01 MA L7849-01 6/28/2004 Ru-106 -7.90E+01 9,901E+01 3.80E+02 MA L7849-01 6/28/2004 Sb-124 -3.20E+01 3.501E+01 1.60E+02 MA 1,7849-01 6/28/2004 Sb-125 -1.30E+01 2.3013+01 8.80E+01 MA L7849-01I 6/2/2004 Se-75 I1.901E+01 I1.401E+01 4.6013+01 MA L7849-01 6/28/2004 Zn-65 -2.80E+01 2.201E+01 9.40E+01 MA L7849-01 6/28/2004 Zr-95 -1.OOE+01 2.20E3+01 8.901E+01 MA 8 L7849-02 6/28/2004 AcMh-228 2.60E+01 3.701E+01 1.30E3+02 MA 8 L7849-02 6/28/2004 Ag-108m 0.00E+00 6.50E+00 2.401E+01 MA 8 L7849-02 6/28/2004 Ag-I lOIn -.1.OOE+00 1.40E+0I 5.60E+01 MA 8 L7849-02 6/28/2004 Ba-140 -1 .40E+02 1.20E+02 6. 1O01+02 MA 8 L7849-02 6/28/2004 Bc-7 -I1.20E+02 1.30E+02 5.201E+02 MA 8 L7849-02 6/28/2004 Ce-141 -3.OOE+01 2.60E+01 9.60E3+01 MA 8 L7849-02 6/28/2004 Ce-144 -4.60E+01 3.80E+01 1.40E3+02 MA 8 L7849-02 6/28/2oo4 Co-57 -2.201E+00 4.SOE+00 1.701E+01 MA 8 L7849-02 6/28/2004 Co-58 I1.90E+01 1.60E+01 5.301E+01 MA 8 L7849-02 6/28/2004 Co-60 -5.00E+00 8.60E+00 3.70E+01 MA 8 L7849-02 6/28/2004 Cr-51 1.40E+02 1.80E+02 6.20E+02 MA 8 L7849-02 6/28/2004 Cs-134 9.80E+00 9.80E+00 3.401E+0 I MA 8 L7849-02 6/28/2004 Cs-137 -3.401E+00 9.40E+00 3.70E+01 MA 8 L7849-02 6/28/2004 Fe-59 3.90E+01 3.101E+01 1.IOE1+02 MA 8 L7849-02 6/28/2004 1-131 -2.401E+02 s. OE+02 2.001E+03

• Radioactivity detected In sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-49

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

MA 8 L7849-02 6/28/2004 K-40 I1.521E+03 2.301E+02 4.201E+02 MA 8 L7849-02 6/28/2004 la-140 -1.60E+02 1.401E+02 7.OOE+02 MA 8 L7849-02 6/28/2004 Mn-54 3.001E+00 9.90E+00 3.70E+01 MA 8 L7849-02 6/28/2004 Nb-95 -8.001E+00 2.30E+01 9.201E+01 MA 8 L7849-02 6/28/2oo4 Ru-103 -3.10OE+01I I1.90E+0 1 8.001E+01 MA 8 L7849-02 6/28/2004 Ru-106 6.20E+01I 8.501E+01 3.001E+02 MA 8 L7849-02 6/28/2004 Sb-124 0.00E+00 3. 1OE1+0 I I1.301E+02 MA 8 L7849-02 6/28/2004 Sb-125 1.001E+01 2.50E3+01 9.101E+0 I MA 8 L7849-02 6/28/2004 Se-75 2.001E+00 I.OOE3+01 3.80E+01 MA 8 L7849-02 6/28/2004 Zn-65 -2. 101+0 I 2.601E+01 1.IOE+02 MA 8 L7849-02 6/28/2004 Zr-95 -2.101E+01 2.701E+01 I.I OE+02 MU 11 L7850-01 7/20/2004 AcTh-228 -2.OOE+00 3.70E+01 I1.401E+02 MU 11 L7850-01 7/20/2004 Ag-lOSm 5.10E+00 7.70E3+00 2.7013+01 MU 11 L7850-01 7/20/2004 Ag-l lOm -3.00E3+00 I.5S1E+01 5.801E+01 MU 11 L7850-01 7/20/2004 Ba-140 -4.70E+01 4.201E+01 2.10OE+02 MU 11 L7850-01 7/20/2004 Be-7 5.201E+01 9.401E+01 3.401E+02 MU 11 L7850-01 7/20/2004 Ce-141 -5.OOE+00 2.00E3+01 7.20E3+01 Mu 11 L7850-01 7/20/2004 Ce-144 4.101E+01 4.60E+01 I1.601E+02 MU 11 L7850-01 7/20/2004 Co-57 4.OOE-01 5.901E+00 2.10E3+0 I MU 11 L7850-01 7/20/2004 CO-5S -2.60E+01 1.201E+01 5.60E3+01 MU 11 L7850-01 7/20/2004 Co-60 -2.OOE+00 1.IOE1+0 I 4.501E+01 MU 11 L7850-01 7/20/2004 Cr-51 -9.001E+01 1.40E3+02 5.30E+02 MU 11 L7850-01 7/20/2004 Cs-134 -1 .OOE+00 1.201E+01 4.501E+01 MU 11 L7850-01 7/20/2004 Cs-137 I.OOE+00 9.40E+00 3.60E+01 MU 11 L7850-01 7/20/2004 Fe-59 -2.30E+01 4.80E+01 2.OOE+02 MU 11 L7850-01 720/2004 1-131 0.OOE3+00 8.40E+01 3.2013+02 MU 11 L7850-01 7/20/2004 K40 1.211E+03 2.20E+02 4.001E+02 MU 11 L7850-01 7/20/2004 IA-140 -5.50E+01 4.80E+01 2.40E+02 MU 11 L7850-01 7/20/2004 Mn-54 4.001E+00 I.OOE+01 3.90E3+01 MU 11 L7850-01 7/20/2004 Nb-95 I.801E+01 I1.701E+01 5.80E+01 MU 11 L7850-01 7/20/2004 Ru-103 3.101E+01 1.30E+01 4.OOE+01 MU 11 L7850-01 7/20/2004 Ru-106 -I.OOE3+01 1.00E+02 3.901E+02 MU 11 L7850-01 7/20/2004 Sb-124 -1.101E+01 1.90E+01 1.00E+02 MU 11 L7850-01 7/20/2004 Sb-125 -8.OOE3+00 2.401E+0 1 9.301E+01 MU 11 L7850-01 7/20/2004 Se-75 -2.001E+00 I1.20E+01 4.301E+01 MU 11 L7850-01 7/20/2004 Zn-65 -6.001E+00 2.701E+01 1.IOE1+02 MU 11 L7850-01 7/20/2004 Zr-95 -2.40E+01 I1.901E+01 8.50OE+01 MU 11 L8050-01 9/13/2004 AcWh228 4.OOE+00 3.201E+01 I1.20E+02 MU 11 L8050-01 9/13/2004 Ag-108m -9.00E-01 7.90E+00 2.90E+01 MU 11 L8050-01 9/13/2004 Ag-I lOm 4.OOE+00 1.50E+01 5.301E+01 MU 11 L8050-01 9/13/2004 Ba-140 -1.26E+02 6.40E+01 2.801E+02 MU 11 L8050-01 9/13/2004 Be-7 3.901E+01 9.401E+01 3.30E3+02 MU 11 L8050-01 9/13/2004 Ce-141 -2.80E+01 I1.701E+01 6.401E+01 MU 11 L8050-01 9/13/2004 Cc-144 4.OOE+00 3.501E+01 1.20E+02

• Radioactivity detected in sample (i.e., concentration >3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-50

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

MU 11 L8050-01 9/13/2004 Co-57 8.40E+00 4.60E+O0 I.50E+0I MU 11 L8050-01 9/13/2004 Co-58 1.lIOE+01 1.lIOE+0I 3.80E+OI MU 11 L8050-01 9/13/2004 Co-60 2.50E+01 1.l1OE+01 3.40E+01 MU 11 L8050-01 9/13/2004 Cr-51 3.OOE+01 1.1 OE+02 4.00E+02 MU 11 L8050-01 9/13/2004 Cs-134 5.OOE+00 I .00E+0I 3.60E+01 MU II L8050-01 9/13/2004 Cs-137 O.OOE+00 8.60E+00 3.20E+O I MU I1 L8050-01 9/13/2004 Fe-59 -4.30E+01 3.50E+01 1.50E+02 MU II L8050-01 9/13/2004 1-131 7.10E+01 8.60E+O1 3.OOE+02 MU II L8050-01 9/13/2004 K40 1.15E+03 2.00E+02 4.SOE+02 MU 11 L8050-01 9/13/2004 La-140 -1.44E+02 7.40E+01 3.20E+02 MU II L8050-01 9/13/2004 Mn-54 -1.30E+O0 8.30E+00 3.20E+01 MU 11 L8050-01 9/13/2004 Nb-95 -1.90E+OI 2.00E+01 7.70E+01 MU 11 L8SO0-01 9/13/2004 Ru-103 -9.00E+00 1.20E+01 4.70E+01 MU 11 L8050-01 9/13/2004 Ru-106 1.24E+02 6.60E+01 2.10E+02 MU 11 L8050-01 9/13/2004 Sb-124 8.00E+00 2.40E3+OI 9.80E+01 MU 11 L8050-01 9/13/2004 Sb-125 -1.40E+01 2.30E+01 8.70E+01 MU 11 L8050-01 9/13/2004 Sc-75 -S.60E+00 9.40E+00 3.50E+01 MU 11 L8050-01 9/13/2004 Zn-65 3.30E+01 4.60E+01 1.60E+02 MU 11 L8050-01 9/13/2004 Zr-95 3.30E+O1 1.90E+01 6.00E+O1 mu 24 L7850-02 7/19/2004 Acl1h-22S 2.20E+01 5.40E+01 1.90E+02 MU 24 L7850-02 7/19/2004 Ag-108m -6.OOE+00 1.20E+01 4.SOE+01 MU 24 L7850-02 7/19/2004 Ag-I lrn 6.00E+00 2.20E+0I 8.00E+01 MU 24 L7850-02 7/19/2004 Ba-140 -1.30E+O1 6.00E+01 2.40E+02 MU 24 L7850-02 7/19/2004 Bc-7 3.60E+02 1.80E+02 5.70E+02 MU 24 L7850-02 7/19/2004 Ce-141 -1.70E+0I 3.20E+O1 1.IOE+02 MU 24 L7850-02 7/19/2004 Cc-144 -3.60E+01 6.90E+OI 2.SOE+02 MU 24 L7850-02 7/19/2004 Co-57 6.90E+00 9.00E+00 3. 10E+0I MU 24 L7850-02 7/19/2004 CO-S8 -1.40E+01 1.801E+01 6.90E+0 I MU 24 L7850-02 7/19/2004 Co'O -5. IOE+OI 1.801E+01 7.60E+O1 MU 24 L7850-02 7/19/2004 Cr-51 -5.20E+02 2. 10E+02 8.20E+02 MU 24 L7850-02 7/19/2004 Cs-134 -1.60E+01 1.50E+O1 5.70E+0O MU 24 L7850-02 7/19/2004 Cs-137 I.50E+01 l .50E+01 4.90E+0I MU 24 L7850-02 7/19/2004 Fc-59 -7.60E+01 5.30E+01 2.20E+02 MU 24 L7850-02 7/19/2004 1-131 8.00E+O1 1.60E+02 5.50E+02 MU 24 L7850-02 7/19/2004 K-40 1.06E+03 2.60E+02 7.20E+02 MU 24 L7850-02 7/19/2004 La-140 -1.50E+O1 7.00E+OI 2.80E+02 MU 24 L7850-02 7/19/2004 Mn-54 -1.70E+OI l .SOE+O1 5.70E+0 I MU 24 L78S0-02 7/19/2004 Nb-95 -6.OOE+00 2.70E+01 9.80E+O1 MU 24 L7850-02 7/19/2004 Ru-103 -9.00E+00 2.10E+01 7.80E+01 MU 24 L78S0-02 7/19/2oo4 Ru-106 0.OOE+00 1.40E+02 4.90E+02 MU 24 L7850-02 7/19/2004 Sb-124 6.00E+01 3.70E+O1 1.20E+02 MU 24 L7850-02 7/19/2004 Sb-125 -7.OOE+00 3.20E+01 1.20E+02 MU 24 L7850-02 7/19/2004 Sc-75 O.OOE+00 2.1OE+OI 7.20E+01 MU 24 L7850-02 7/19/2004 Zn-65 -2.80E+0 I 3.90E+01 l.50E+02

• Radioactivity detected In sample (ive., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-51

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/kg) (pCi/kg) (pCi/kg)

MU 24 L7850-02 7/19,2004 Zr-95 0.00E+00 3.00E+O1 1.IOE+02 MU 24 L8050-02 9/13/2004 AcTh-228 1.30E+01 4.30E+OI I.50E+02 MU 24 L80S0-02 9/13/2004 Ag-108m -3.80E+00 6.70E+00 2.50E+01 MU 24 L8050-02 9/13/2004 Ag-I lOm 2.00E+00 1.30E+01 4.70E+01 MU 24 L8050-02 9/13/2004 Ba-140 -1.30E+01 4.90E+01 2.00E+02 MU 24 L8050-02 9/13/2004 Bc-7 -9.00E+O1 1l.OOE+02 3.90E+02 MU 24 L8050-02 9/13/2004 Cc-141 2.30E+01 1.90E+01 6.40E+01 MU 24 L8050-02 9113/2004 Ce-144 -2.90E+01 4.SOE+01 1.60E+02 MU 24 L8050-02 9/13/2004 Co-57 5.OOE-01 6.10E+00 2.10OE+01 MU 24 L8050-02 9/13/2004 Co-58 -1.30E+01 1.IOE+OI 4.40E+01 MU 24 L80O5-02 9/13/2004 CD-60 8.00E+00 1. IOE+0I 4.10E+01 MU 24 L8050-02 9/13/2004 Cr-51 1.00E+02 1.30E+02 4.60E+02 MU 24 L8050-02 9/13/2004 Cs-134 8.00E+00 1.00E+01 3.60E+01 MU 24 L8050-02 9/13/2004 Cs-137 -2.40E+00 9.20E+00 3.50E+01 MU 24 L8050-02 9/13/2004 Fe-59 6.10E+01 3.70E+0I 1.20E+02 MU 24 L8050-02 9/13/2004 1-131 5.00E+O1 9.90E+01 3.50E+02 MU 24 L805O-02 9/13/2004 K40 9. 10E+02 2.1OE+02 5.40E+02 MU 24 L8050-02 9/13/2004 La-140 -I.SOE+01 S.70E+01 2.30E+02 MU 24 L8050-02 9/13/2004 Mn-54 2.00E+00 9.1OE+00 3.40E3+01 MU 24 L8050-02 9/13/2004 Nb-95 5.00E+00 1.90E+O1 7.OOE+01 MU 24 L8050-02 9/13/2004 Ru-103 l.SOE+01 1.40E+O1 4.90E+01 MU 24 L8050-02 9/13/2004 Ru-106 -8.101E+01 8.50E+01 3.30E+02 MU 24 L8050-02 9/13/2004 Sb-124 4.101E+01 3.00E+01 9.90E+01 MU 24 L8050-02 9/13/2004 Sb-125 3.60E+01 2.30E+0 I 7.40E+01 MU 24 L8050-02 9/13/2004 Se-75 1.80E+O1 1.lOE+01 3.SOE+O1 MU 24 L8050-02 9/13/2004 Zn-65 1.13E+02 4.70E+O1 l.SOE+02 MU 24 L8050-02 9/13/2004 Zr-95 -3.80E+01 1.90E+01 8.40E+01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-52

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/L) (pCilL) (pCilL)

TM 18 L6776-01 1/2004 Ac l-228 -I.06E+01 6.OOE+00 2.401E+0 I TM 18 L6776-01 1/8o2004 Ag-108m 0.OOE+00 I1.30E+00 4.601E+00 TM 18 L6776-01I 1/8/2004 Ag-I lOm -5.50E+00 I1.90E+00 8.301E+00 TM 18 L6776-01 1s8/2004 Ba-140 O.OOE+00 2.601E+00 I .00E+01 TM 18 L6776-01 1/8/2004 Be-7 3.OOE+00 1.201E+01 4.20E+01 TM 18 L6776-01 1/8/2004 Ce-141 1.20E+00 2.301E+00 8.OOE+00 TM 18 L6776-01 1/8/2004 Ce-144 8.30E+O0 7.201E+00 2.401E+0 I TM 18 L6776-01 18/2004 Co-57 1.30E+00 I.00E3+00 3.401E+00 TM 18 L6776-01 1/8/2004 Co-58 -1.20E+00 I1.50E3+00 5.701E+00 TM 18 L6776-01 1/8/2004 Co-60 1.1 OE+00 I1.801E+00 6.301E+00 TM 18 L6776-01 1//2004 Cr-51 -7.00E+00 I1.201E+01 4.301E+01 TM 18 L6776-01 1/8/2004 Cs-134 3.00E-01 I1.401E+00 4.80E3+00 TM 18 L6776-01 1/&82004 Cs-137 4.20E+00 1.301E+00 3.80E+00

• TM 18 L6776-01 1/8/2004 Fe-59 -7.00E+00 5.50E+00 2.20E3+01 TM 18 L6776-01 1/8/2004 1-131 -5.20E+00 3.40E+00 1.30E+01 TM 18 L6776-01 1/8/2004 K-40 Il.SOE+03 6.70E+01 6.601E+01

• TM 18 L6776-01 1/8/2004 La-140 0.00E+00 3.00E3+00 I1.20E3+01 TM 18 L6776-01 1/8/2004 Mn-54 1.60E+00 I1.5013+00 5.201E+00 TM 18 L6776-01 1/8/2004 Nb-95 -1. IOE+O0 I1.701E+00 6.40E+00 TM 18 L6776-01 1/8/2004 Ru-103 2.00E-01 I1.701E+00 6. 10E+00 TM 18 L6776-01 1/8/2004 Ru-106 -2.60E+01 1.301E+01 5.0O1E+01 TM 18 L6776-01 1/8/2004 Sb-124 -3. 10E+00 3.30E+00 1.401E+01 TM 18 L6776-01 1/8/2004 Sb-125 l.SOE+00 3.80E3+00 I1.301E+01 TM 18 L6776-01 1/8/2004 Se-75 5.OOE-01 1.601E+00 5.501E+00 TM 18 L6776-01 1/8/2004 Zn-65 -1 .OOE+00 3.701E400 I1.40E+01 TM 18 L6776-01 1/8/2004 Zr-95 -6.00E+00 3.001E+00 1.20E3+01 TM 18 L7368-01 1/8/2004 Sr-89 -1.69E+01 8.001E+00 6.801E+00 TM 18 L73'68-01 1/8/2004 Sr-90 2.10E+00 4.601E-01 1.401E+00

• TM 18 L775 I-01 6/25/2004 AcTh-228 5.80E+00 3.401E+00 I. IOE+01 TM 18 L775 I-01 6/2n/2004 Ag-108m 3.OOE-0I 6.60E-01 2.301E+00 TM 18 L775 I-01 6/25/2004 Ag-I lOm -1.60E+00 I1.401E+00 5.00OE+00 TM 18 L775 I1-01 6/25/2004 Ba-140 3.00E-01 3.801E+00 1.40E3+01 TM 18 L7751I-01 6/25/2004 Be-7 4.20E+00 8.401E+00 2.901E+01 TM 18 L775 I-01 6/25/2004 Ce-141 -2.40E+O0 2.00OE+00 7.001E+00 TM 18 L775 I-01 6/25/2004 Cc-144 1.01E+01 5.001E+00 I1.60E+01 TM 18 L7751I-01 6/25/2004 Co-57 -2.40E-0I 6.70E-01 2.30E+00 TM 18 L775 I-01 6/23/2004 Co-58 -7.00E-01 1.1O01+00 4. IOE1+00 TM 18 L775 I -01 6/25/2004 Co-60 4.00E-0I I1.20E+00 4.201E+00 TM 18 L7751I-01 6/25/2004 Cr-51 O.OOE+00 I. IOE+01I 3.901E+01 TM 18 L775 I-01 6/25/2004 Cs-134 1.80E-01 9.50E3-01 3.30E+00 TM 18 L775 1-01 6/25/2004 Cs-137 6.50E-01 8.801E-01 3.OOE+00 TM 18 L7751I-01 6/25/2004 Fe-59 -7.70E+00 3.90E+00 1.50E+01 TM 18 L775 I-0l 6/25/2004 1-131 -3.80E+00 9.10E+00 3.20E+01I TM 18 L775 I1-01 6/25/2004 K-40 1.38E+03 3.901E+01I 4.50E3+0 I

• TM 18 L775 I-01 6/2n/2004 La-140 4.00E-01 4.401E+00 1.60E+01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-53

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (Pci/L) (pCitL) (pCi/L)

TM 18 L7751-01 6/25/2004 Mn-54 2.09E+00 8.80E-01 2.80E+O0 TM 18 L775 1-01 6/25/2004 Nb-95 -2.20E+00 1.40E+00 5.20E+O0 TM 18 L7751I-01 6/25/2004 Ru-103 -1.80E+O0 1.30E+00 4.60E-i00 TM 18 L7751I-01 6/25/2004 Ru-106 -4.50E+00 7.soE+00 2.70E+01 TM 18 L7751I-01 6/25/2004 Sb-124 I1.80E+00 2.10E+00 7.40E3+00 TM 18 L7751I-01 6/25/2004 Sb-125 -1.20E+00 2.101E+00 7.40E+00 TM 18 L7751I-01 6/25/2004 Se-75 -2.OOE-0 1 9.90E-01 3.40E+00 TM 18 L775 1.-01 6n25/2004 Zn-65 4.001E-01 2.50E+00 8.60E+00 TM 18 L775 I1-01 6/25/2004 Zr-95 -1.50E+O0 1.90E+00 7.OOE+O0 TM 18 L7882-01 6/25/2004 Sr-9 -1 .20E+O0 3.00E+00 9.60E+00 TM 18 L7882-01 6/25/2004 Sr-90 2.151E+00 5.40E-01 1.70E+00 TM 25 L6776-02 1/8/2004 AcTh-228 2.30E+00 6.30E+O0 2.20E3+01 TM 25 L6776-02 1/8/2004 Ag-108m 4.OOE-01 1.lOE+00 3.90E+00 TM 25 L6776-02 1/8/2004 Ag-I 1lm 8.OOE-01 2.10E+00 7.50E+O0 TM 25 L6776-02 1/8/2004 Ba-140 -3.30E+00 2.90E+00 I1.201E+01 TM 25 L6776-02 1/8/2004 Be-7 -1.30E+01 1.20E+01 4.401E+01 TM 25 L6776-02 1/8/2004 Ce-141 -2.50E+O0 2.40E+00 8.50E+00 TM 25 L6776-02 1/8/2004 Cc-144 -1.20E+O0 9.20E+O0 3.201E+01 TM 25 L6776-02 1/8/2004 Co-57 5.001E-01 1.l1OE+O0 3.801E+00 TM 25 L6776-02 1/8/2004 CO-58 2.OOE+00 1.50E+00 5.20E+00 TM 25 L6776-02 I/8/2004 Co-60 41.8013+00 1.70E+00 6.90E+00 TM 25 L6776-02 1/8/2004 Cr-51 -1.OOE3+00 l.SOE+01 5.30E+01 TM 25 L6776-02 1/8/2004 Cs-134 I1.303+O00 1.60E+00 5.60E3+00 TM 25 L6776-02 1/8/2004 Cs-137 3.001E-01 1.60E+O0 5.70E+00 TM 25 L6776-02 1/8/2004 Fe-59 -1.30E+O0 5.20E+00 2.00E+01 TM 25 L6776-02 1/8/2004 1-131 -1.OOE+00 3.80E+00 1.301E+01 TM 25 L6776-02 1/8/2004 K-40 I1.39E+03 6.40E+01 6.60E+01 TM 25 L6776-02 1/8/2004 La-140 -3.S01E+00 3.40E+00 IAO0E+01 TM 25 L6776-02 1/8/2004 Mn-54 9.OOE-01 1.40E+00 5.00E3+00 TM 25 L6776-02 1/8/2004 Nb-95 1.IOE+00 l.50E+00 5.2013+00 TM 25 L6776-02 1/8/2004 Ru-103 -3.40E+O0 1.60E+00 6.401E+00 TM 25 L6776-02 1/8/2004 Ru-106 I1.20E+01 1.30E+01 4.30E+01 TM 25 L6776-02 1/8/2004 Sb-124 -5.40E+00 3.50E+00 I1.50E+01 TM 25 L6776-02 1/8/2004 Sb-125 *7.OOE-01 3.60E+00 1.30E+01 TM 25 L6776-02 1/8/2004 Se-75 -2.101E+00 1.60E+00 5.90E+00 TM 25 L6776-02 1/8/2004 Zn-65 3.30E3+00 4. 10E+O0 I1.40E3+01 TM 25 L6776-02 1/8/2004 Zr-95 8.OOE3-01 2.70E+00 9.501E+00 TM 25 L7368-02 1/8/2004 Sr-S9 2.80E3+00 8.90E+00 8. 1 OE+O0 TM 25 L7368-02 1/8/2004 Sr-90 8.40E-01 5.30E-01 1.70E+O0 TM 25 L7751-02 6/28/2004 AcTh-228 2.501E+00 4.30E+00 1.501E+01 TM 25 L7751-02 6/28/2004 Ag-108m I1.4713+00 9.90E-O1 3.30E3+00 TM 25 L775 1-02 6/28/2004 Ag- 1Dim 2.40E+00 1.70E+00 5.7013+00 TM 25 L775 1-02 6/28/2004 Ba-140 -2.40E+O0 3.70E+00 1.50E+01 TM 25 L7751-02 6/28/2004 Bc-7 -8.OOE+O0 1.30E+01 4.70E+01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-54

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pUiL) (pCi/L) (pCi/L)

TM 25 L775 1-02 6/28/2004 Ce-141 4. IOE1+00 3.I1OE+00 1.00E+01 TM 25 L775 1-02 6/28/2004 Ce-144 -1.22E+01 8.90E+O00 3. IOE+01I TM 25 L7751-02 6/28/2004 Co-57 5.OOE-01 1.1 OE+00 3.90E+00 TM 25 L7751-02 6/28/2004 CO-58 8.001E-01 1.501E+00 5.I1OE+00 TM 25 L7751-02 6/28/2004 Co-60 -1.00E-01 1.401E+00 5.201E+00 TM 25 L7751-02 6/28/2004 Cr-51 4.30E+01 I1.80E+01 5.601E+01I TM 25 L7751-02 6/28004 Cs-134 0.001E+00 1.20E+00 4.50E+00 TM 25 L7751-02 6/28/2004 Cs-137 3.60E+00 I1.801E+00 5.70E+00 TM 25 L7751-02 6/28/2004 Fe-59 4.20E+00 4.80E+00 1.60E+01 TM 25 L7751-02 6/28/2004 1-131 5.001E-01 9.20E+00 3.201E+0 I TM 25 L7751-02 6/28/2004 K-40 1.35E+03 5.20E+01 5.20E+01 TM 25 L775 1-02 6/28/2004 La-140 -2.70E+00 4.30E+00 I1.70E3+01 TM 25 L7751-02 6/28/2004 Mn-54 2.OOE+00 I1.20E+00 3.80E+00 TM 25 L7751-02 6/28/2004 Nb-95 -4.OOE-01 1.901E+00 6.70E+00 TM 25 L7751-02 6/28/2004 Ru-103 -2.30E+00 I1.60E+00 6.001E+00 TM 25 L7751-02 6/28/2004 Ru-106 I1.301E+01 1.OOE3+01 3.30E+01 TM 25 L7751-02 6/28/2004 Sb-124 -5.OOE-01 2.40E+00 9.80E+00 TM 25 L7751-02 6/28/2004 Sb-125 3.60E+00 3.30E+00 1.IOE+01I TM 25 L7751-02 6/28/2004 Se-75 3.40E+00 I1.70E+00 5.301E+00 TM 25 L7751-02 6/28/2004 Zn-65 -1 .60E+00 3.IO E+00 1.20E+01I TM 25 L775 1-02 6/28/2004 Zr-95 I1.70E+00 2.60E+00 9.001E+00 TM 25 L7882-02 6/28/2004 Sr-89 I .OOE-01 2.70E+00 9.40E+00 TM 25 L7882-02 6/28/2004 Sr-90 8.001E-01 5. IOE-01I I1.70E+00 WE 14 L7002-01 1/27/2004 Aclh-228 2.60E+00 1.60E+00 5.30OE+00 WE 14 L7002-01 1/27/2004 Ag-lO8m 4.20E-01 3.801E-01 I1.30E+00 WE 14 L7002-01 1/27/2oo4 Ag-i lOmn -1.401E-01 6.401E-01 2.201E+00 WE 14 L7002-01 1/27/2004 Ba-140 -7.60E+00 3. IOE1+00 1.20E+01 WE 14 L7002-01 1/27/2004 Be-7 7.201E+00 6.20E+00 2.OOE+01 WE 14 L7002-01 1/27/2004 Ce-141 -2. IOE1+00 2.40E+00 8.201E+00 WE 14 L7002-01 1/27/2004 Cc-144 5.001E+00 3.20E+00 1.IOE1+01I WE 14 L7002-01 1/27/2004 Co-57 -4.001E-02 4.I1OE-0 I 1.401E+00 WE 14 L7002-01 1/27/2004 Co-58 -2.801E-01 5.90E3-01 2. 101+00 WE 14 L7002-01 1/27/2004 Co-60 -1 .70E-01 4.80E-01 I1.70E+00 WE 14 L7002-01 1/27/2004 Cr-51 I1.34E+01 9.301E+00 3.I1OE+01I WE 14 L7002-01 1/27/2004 Cs-134 3.00E-01 5.40E-01 I1.801E+00 WE 14 L7002-01 1/27/2004 Cs-137 -2.201E-01 4.201E-01 1.50E+00 WE 14 L7002-01 1/27/2004 Fe-59 -3.70E+00 I1.901E+00 7.1OE+00 WE 14 L7002-01 1/27/2004 1-131 2.00E3+00 1.OOE+01 3.50E+01I WE 14 L7002-01 1/27/2004 K-40 2.57E+02 I1.30E+01 WE 14 L7002-01 1/27/2004 la-140 -8.801E+00 3.501E+00 I1.40E+01 WE 14 L7002-01 1/27/2004 Mn-54 9.00OE-02 4.90E-01 I1.70E+00 WE 14 L7002-01 1/27/2004 Nb-95 -9.00OE-01 8.90E-01 3.20E+00 WE 14 L7002-01 1/27/2004 Ru-103 -3.58E+00 9.30E-01 3.40E+00 WE 14 L7002-01 1/27/2004 Ru-106 -9.OOE-01 4.50E+00 1.50E+01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-55

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/L) (pCUL) (pCUL)

WE 14 L7002-01 1/27/2004 Sb-124 3.OOE-01 1.50E+00 5.20E+O0 WE 14 L7002-01 1/27/2004 Sb-12S 1.40E+00 1.20E+00 3.90E+00 WE 14 L7002-01 1/27/2004 se-75 1.77E+00 7.40E-01 2.40E+00 WE 14 L7002-01 1/27/2004 Zn-65 -2.OOE-01 1.20E+00 4.1OE+00 WE 14 L7002-01 1/27/2004 Zr-95 -9.OOE-01 L.IOE+O0 3.80E+00 WE 14 L7002-03 2/24/2004 Ach-228 2.00E+00 6.20E+00 2.30E+01 WE 14 L7002-03 2/24/2004 Ag-lOSm 0.OOE+00 1.30E+00 4.70E+00 WE 14 L7002-03 2/24/2004 Ag-i lOmn 3.70E+00 2.10E+00 6.90E+00 WE 14 L7002-03 2/24/2004 Ba-140 -6.OOE-0I 2.70E+00 I.IOE+OI WE 14 L7002-03 2/24/2004 Bc-7 2.00E+00 1.20E+01 4.40E+01 WE 14 L7002-03 224/2004 CQ-141 2.60E+00 2.80E+00 9.50E+00 WE 14 L7002-03 2/24/2004 cc-144 1.60E+0I I.IOE+01 3.50E+01 WE 14 L7002-03 2/24/2004 Co-57 -2.OOE-01 1.40E+00 4.soE+O0 WE 14 L7002-03 2/24/2004 Co-58 -4.OOE-01 L.50E+00 5.90E+O0 WE 14 L7002-03 2/24/2004 Co-60 1.80E+0O 1.80E+00 6.50E+O0 WE 14 L7002-03 2n24/2004 Cr-SI -2.00E+01 1.50E+01 5.70E+OI WE 14 L7002-03 2/24/2004 Cs-134 -3.20E+00 1.40E+00 6.40E+00 WE 14 L7002-03 2/24/2004 Cs-137 LOOE-01 1.SOE+00 5.60E+00 WE 14 L7002-03 2/24/2004 Fe-59 1.04E+01 4.90E+O0 I.SOE+01 WE 14 L7002-03 2/24/2004 1-131 -3.20E+00 3.20E+00 1.20E+01 WE 14 L7002-03 2/24/2004 K-40 2.13E+02 3.70E+0I 8.90E+01 WE 14 L7002-03 2/24/2004 La-140 -7.OOE-01 3.10E+00 1.20E+O1 WE 14 L7002-03 2/24/2004 Mn-s4 3.OOE-01 1.70E+00 6.20E+O0 WE 14 L7002-03 2/24/2004 Nb-95 -3.OOE-01 1.70E+00 6.40E+O0 WE 14 L7002-03 2/24/2004 Ru-103 -2.20E+00 1.60E+00 6.40E+O0 WE 14 L7002-03 2/24/2004 Ru-106 1.90E+01 1.SOE+01 S.OOE+01 WE 14 L7002-03 2/24/2004 Sb-124 2.OOE+00 3.40E+00 1.30E+01 WE 14 L7002-03 2/24/2004 Sb-125 O.OOE+00 4.60E+00 1.70E+O1 WE 14 L7002-03 2/24/2004 Se-75 7.00E-01 2.20E+00 7.70E+00 WE 14 L7002-03 2/24/2004 Zn-65 -6.90E+00 4.OOE+00 1.70E+01 WE 14 L7002-03 2/24/2004 zr-95 1.30E+00 2.30E+00 8.SOE+00 WE 14 L7200-01 3/30/2004 Acnh-22s -5.80E+00 5.70E+00 2.30E+01 WE 14 L7200-01 3/30/2004 Ag-lOSm 1.40E+00 LI.OE+00 3.soE+00 WE 14 L7200-01 3/30/2004 Ag-IlOm -1.40E+00 1.70E+00 7.10E+00 WE 14 L7200-01 3/30/2004 Ba-140 4.30E+00 2.60E+00 8.OOE+00 WE 14 L7200-01 3/30/2004 Bc-7 1.20E+01 1.20E+01 4.20E+OI WE 14 L7200-01 3/30/2004 Ce-141 9.OOE-01 2.50E+00 8.50E+00 WE 14 L7200-01 3/30/2004 cc-l44 7.00E+00 7.SOE+00 2.60E+O1 WE 14 L7200-01 3/30/2004 Co-57 -1.23E+O0 9.50E-01 3.soE+O0 WE 14 L7200-01 3/30/2004 Co-5S 2.20E+00 1.40E+00 4.40E+00 WE 14 L7200-01 3/30/2004 Co-60 -4.OOE-01 1.70E+00 6.90E+00 WE 14 L7200-01 3/30/2004 Cr-SI 2.00E+00 1.40E+01 5.20E+01 WE 14 L7200-01 3/30/2004 Cs-134 0.00E+00 1.70E+00 6.SOE+00 WE 114 L7200-01 3/30/2004 Cs-137 8.OOE-01 1.20E+00 4.SOE+00 WE 14 L7200-01 3/30/2004 Fe-59 1.70E+00 3.70E+00 1.40E+01 WE 14 L7200-01 3/30/2004 1-131 -2.30E+00 3.30E+00 1.30E+01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-56

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCa/L) (pCi/L) (pCUL)

WE 14 L7200-01 3/30/2004 K-40 2.0313+02 3.70E+01 8.6013+01 WE 14 L7200-01 3/30/2004 La-140 5.00E+00 3.OOE+00 9.2013+00 WE 14 L7200-O1 3/30/2004 Mn-54 I .OOE+00 1.80E+00 6.30E+00 WE 14 L7200-01 3/30/2004 Nb-95 I1.70E+00 I1.901E+00 6.701E+00 WE 14 L7200-01 3/30/2004 Ru-103 -1.50E+00 I .8OE+00 6.90E+00 WE 14 L7200-01 3/30/2004 Ru-106 5.00E+00 I1.2013+01 4.40E-.+01 WE 14 L7200-01 3/30/2004 Sb-124 -1.20E+00 3. I OE+00 I1.401E+01 WE 14 L7200-01 3/30/2004 Sb-125 I1.70E+00 3.9013+00 I1.401E+01 WE 14 L7200-01 3/30/2004 Se-75 -3.60E+00 I1.70E3+00 6.70E+O0 WE 14 L7200-01 3/30/2004 Zn-65 I1.40E+00 3.20E+00 1.2011+01 WE 14 L7200-01 3/30/2004 Zr-95 3.20E+00 2.40E-i00 S.201-e+00 WE 14 L7300-01 3/30/2004 H-3 0.001E+00 3.10E+02 1.00E+03 WE 14 L7367-01 4/27/2004 AcTh-228 -4.60E+00 5.40E+00 2.20E+01 WE 14 L7367-01 4/27/2004 Ag-108m -3.OOE-01 1.I 01+00 4.10E-400 WE 14 L7367-01 4/27/2004 Ag- lOin 6.OOE-01 I.80E+00 6.70E-'00 WE 14 L7367-01 4/27/2004 Ba-140 -2.50E+00 3.4013+00 1.4013+01 WE 14 L7367-01 4/27/2004 Be-7 -4.0013+00 1.20E1i+01 4.5013+01 WE 14 L7367-01 4/27/2004 Ce-141 5.l0OE+00 2.4013+00 7.90E+00 WE 14 L7367-01 4/27/2004 Ce-144 -1.1 7E+01 6.9013+00 2.60E-.01 WE 14 L7367-01 4/27m2004 Co-57 -6.50E-01 9.1013-01 3.30E+00 WE 14 L7367-01 4/27/2004 Co-58 -1 .40E+00 1.40E+00 5.8SOE+00 WE 14 L7367-01 4/27/2004 Co 60 3.00E-0I 1 .8013+00 6.90E+00 WE 14 L7367-01 4/27/2004 Cr-51 -9.00OE+00 I1.20E+01 4.7013+01 WE 14 L7367-01 4/27/2004 Cs-134 -7.00E-01 I1.701E+00 6.50E+00 WE 14 L7367-01 4/27/2004 Cs-137 2.20E+00 I1.301+O00 4.20E+00 WE 14 L7367-01 4/27/2004 Fe-59 -4.50E+00 4.80E+00 2.OOE-'01 WE 14 L7367-01 4/27/2004 1-131 -2.80E+00 3.6013+00 1.40E+01 WE 14 L7367-01 4/27/2004 K40 9.90E+0l 2.80E+01 7.90E+01 WE 14 L7367-01 4/272004 La-140 -2.9013+00 3.90E-I00 I1.70E-i01 WE 14 L7367-01 4/27/2004 Mn-54 -2.OOE-01 I1.30E400 5.10OE+00 WE 14 L7367-01 4/27/2004 Nb-95 -1 .00E+00 1.70E+00 6.80E+00 WE 14 L7367-01 4/27/2004 Ru-103 -3.30E+00 I1.70E+00 6.90E+00 WE 14 L7367-01 4/27/2004 Ru-106 -6.0013+00 I .001E+01 4.I1OE+01I WE 14 L7367-01 4/27/2004 Sb-124 1.IO0E+00 4.40E+00 I1.70E3+01 WE 14 L7367-01 4/27/2004 Sb-125 5.5013+00 3.30E+00 1.IOE+01 WE 14 L7367-01 4/27/2004 Se-75 3.OOE-01 I1.50E+00 5.5013+00 WE 14 L7367-01 4/27/2004 Zn-65 -6.00E-01 3.40E+00 I1.30E-i01 WE 14 L7367-01 4/27/2004 Zr-95 6. 10E+00 2.80E+00 8.50E+00 WE 14 L7726-01 5/25/2004 AcTh-228 2.30E+00 2.30E+'00 7.50E-e00 WE 14 L7726-01 5/25/2004 Ag-108m 1.1 OE-0 1 3.5013-01I I1.2013+00 WE 14 L7726-01 5/25/2004 Ag-I lOm -9.OOE-01 7.20E-01 2.60E+00 WE 14 L7726-01 5/25/2004 Ba-140 -6.90E+00 9.8013+00 3.601-i-01 +

WE 14 L7726-01 5/25/2004 Be-7 -4.00E+00 6.80E+00 2.30E+01 WE 14 L7726-01 5/25/2004 Ce-141 -9.00E-0l 2.2013+00 7.40E-e00 WE 14 L7726-01 5/25/2004 Ce-144 -4.OOE-01 2.90E+e00 9.80E-i00

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-57

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCUL) (pCi/L) (pCi/L)

WE 14 L7726-01 5/25/2004 Co-57 3.20E-01 3.90E-01 1.30E+00 WE 14 L7726-01 5/25/2004 Co-58 6.50E-01 7.40E-01 2.SOE+00 WE 14 L7726-01 5/25/2004 Co-60 0.00E+00 5.10E-0I I.801E+00 WE 14 L7726-01 5/25/2004 Cr-51 1.00E+00 1.20E+01 4.1 OE+O I WE 14 L7726-01 5/25/2004 Cs-134 8.00E-02 4.90E-01 1.70E+00 WE 14 L7726-01 5/25/2004 Cs-137 8.20E-01 4.10E-0I 1.30E+00 WE 14 L7726-01 5/25/2004 Fe-59 -1.60E+O0 2.80E+00 9.90E+00 WE 14 L7726-01 5/25/2004 1-131 -3.40E+01 5.00E+01 1.70E+02 WE 14 L7726-01 5/25/2oo4 K-40 2.44E+02 1.20E+01 2.70E+0O WE 14 L7726-01 5/25/2004 La-140 -8.00E+00 1.lIOE+01 4.1OE+OI WE 14 L7726-01 5/25/2004 hn-54 -5.00E-02 4.60E-01 1.60E+00 WE 14 L7726-01 5/25/2004 Nb-95 -1.60E+00 1.30E+00 4.70E+00 WE 14 L7726-01 5/25/2004 Ru-103 -2.20E+00 1.lOE+00 3.80E+00 WE 14 L7726-01 5/25/2004 Ru-106 -1.50E+00 3.90E+00 1.40E+01 WE 14 L7726-01 5/25/2004 Sb-124 -2.OOE-01 2.10E+00 7.40E+00 WE 14 L7726-01 5/25/2004 Sb-125 8.00E-01 1.20E+00 3.90E+00 WE 14 L7726-01 5/25/2004 Se-75 -2.OOE-01 6.40E-01 2.20E+00 WE 14 L7726-01 5/25/2004 Zn-65 -9.OOE-01 1.20E+00 4.10E+00 WE 14 L7726-01 5/25/2004 Zr-95 -1.40E+00 1.30E+00 4.70E+00 WE 14 L7725-01 6/29/2004 Aclh-228 -1.00E-0I 4.00E+00 1.SOE+01 WE 14 L7725-01 6/29/2004 Ag-108m 3.00E-01 1.00E+00 3.70E+00 WE 14 L7725-01 6129/2004 Ag-I lOm 7.00E-O1 1.40E+O0 4.90E1+O0 WE 14 L7725-01 6/29/2004 Ba-140 -2. 1OE+00 3.40E+00 1.40E+01 WE 14 L7725-01 6/29/2004 Be-7 -4.00E+00 1.IOE+0I 4. 10E+0I WE 14 L7725-01 6/29/2004 Ce-141 -4.101E+O0 2.90E+00 1.00E+01 WE 14 L7725-01 6/29/2004 Ce-144 -2.20E+00 7.70E+00 2.70E+01 WE 14 L7725-01 6/29/2004 Co-57 2.08E+00 9.40E-01 3.00E+00 WE 14 L7725-01 6/29/2004 Co-58 1.70E+00 1.20E+00 3.80E+00 WE 14 L7725-01 6/29/2004 Co-60 6.00E-01 1.20E+00 4.30E+00 WE 14 L7725-01 6/29/2004 Cr-51 -2.40E+01 1.SOE+01 5.70E+01 WE 14 L7725-01 6/29/2004 Cs-134 1.20E+00 1.lOE+00 3.90E+00 WE 14 L7725-01 6/29/2004 Cs-137 -8.30E-0I 9.60E-01 3.80E+00 WE 14 L772-I 6/29/2004 Fe-59 l.lOE+00 3.70E+00 1.40E+01 WE 14 L7725-01 6/29/2004 1-131 -8.60E+00 7.50E+00 2.80E+01 6.1OE+Ol

• WE 14 L7725-01 6/29/2004 K-40 2.03E+02 2.70E+01 WE 14 L7725-01 6/29/2004 La-140 -2.50E+00 3.90E+00 1.60E+O I WE 14 L7725-01 6/29/2004 Mn-54 3.20E-0I 9.50E-01 3.SOE+00 WE 14 L7725-01 6/29/2004 Nb-95 7.00E-01 1.40E+00 5.20E+00 WE 14 L7725-01 6/29/2004 Ru-103 -1.80E+00 1.60E+00 6.20E+00 WE 14 L7725-01 6/29/2004 Ru-106 3.OOE+00 l.OOE+01 3.60E+0I WE 14 L7725-01 6/29/2004 Sb-124 6.00E-01 2.80E+00 1.IOE+0I WE 14 L7725-01 6/29/2004 Sb-125 4.00E-01 2.70E+00 9.80E+00 WE 14 L7725-01 6/29/2004 Se-75 3.20E+00 1.60E+00 5.30E+O0 WE 14 L7725-01 6/29/2004 Zn-65 -6.60E+00 3.00E+00 1.20E+01 WE 14 L7725-01 6/29/2004 Zr-95 6.00E-01 2.20E+00 7.90E+00 WE 14 L7877-01 6/29/2004 H-3 -4.50E+02 5.40E+02 1.80E+03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-58

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/L) (pCUL) (pCi/L)

WE 14 L8226-01 7/27/2004 AcTh-228 -1.90E+00 2. 1OE+00 7.20E+00 WE 14 L8226-01 7/27/2004 Ag-108m 2.60E-01 3.40E-01 l.IOE+00 WE 14 L8226-01 7/27/2004 Ag- lOnm -4.90E-0I 7.00E-01 2.SOE+00 WE 14 L8226-01 7/27/2004 Ba-140 -7.00E+0I 4.40E+01 1.60E+02 +

WE 14 L8226-01 7/27/2004 Be-7 -1.22E+0O 9.10E+00 3.20E+O I WE 14 L8226-01 7/27/2004 Cc-141 -3.50E+00 5.70E+00 1.90E+01 WE 14 L8226-01 7/27/2004 Cc-144 1.60E+O0 3.1OE+00 l .OOE+0I WE 14 L226-01 7/27/2004 Co-57 1.lOE-01 4.1 OE-0I 1.40E+00 WE 14 L8226-01 7/27/2004 Co-58 -9.20E-0I 8.30E-O1 3.OOE+00 WE 14 L8226-01 7/27/2004 Co-60 -2.10E-01 4.90E-OI 1.70E+00 WE 14 L8226-01 7/27/2004 Cr-51 -4.00E+00 2.60E+0I 8.90E+01 WE 14 L8226-01 7/27/2004 Cs-134 9.20E-01 4.SOE-01 1.40E+O0 WE 14 L8226-01 7/27/2004 Cs-137 6.00E-OI 4.30E-0I 1.40E+O0 WE 14 L8226-01 7/27/2004 Fc-59 -9.OOE-0I 4.OOE+00 1.40E+0I WE 14 L8226-01 7/27/2004 1-131 l.09E+03 5.70E+02 l.90E+03 WE 14 L8226-01 7/27/2004 K-40 2.64E+02 I.IOE+0I 2.30E+01 WE 14 L8226-01 7/27/2004 Ls-140 -8.00E+OI 5. IOE+OI 1.90E+02 WE 14 L8226-01 7/27/2004 Mn-54 -6.50E-0I 5. IOE-0 I 1.80E+00 WE 14 L8226-01 7/27/2004 Nb-95 2.20E+00 l.90E+O0 6.50E+00 WE 14 L8226-01 7/27/2004 Ru-103 -2.30E+00 1.70E+O0 6.OOE+00 WE 14 L8226-01 7/27/2004 Ru-106 -1.01E+01 4.60E+00 1.70E+01 WE 14 L8226-01 7/27/2004 Sb-124 6.00E-0O 2.10E+00 7.40E+O0 WE 14 L8226-01 727/2004 Sb-125 1.20E+O0 1.IOE+00 3.70E+00 WE 14 L8226-01 7/27/2004 Se-75 0.00E+00 8.60E-01 2.90E+00 WE 14 L8226-01 7/27/2004 Zn-65 -5.00E-OI 1.60E+00 5.50E+00 WE 14 L8226-01 7/27/2004 Zr-95 -6.00E-01 1.60E+O0 5.50E+O0 WE 14 L8226-03 8/31/2004 AcTh-228 1.00E+00 1.00E+00 4.50E+O0 WE 14 L8226-03 8/31/2004 Ag-108m -8.00E-02 2.50E-0I 8.50E-0I WE 14 L8226-03 8/31/2004 Ag-I lOm S.90E-01 4.30E-01 1.40E+00 WE 14 L8226-03 8/31/2004 Ba-140 -1.70E+00 4.20E+O0 1.50E+01 WE 14 L8226-03 8/31/2004 Be-7 -4.00E-01 4.20E+00 1.40E+0I WE 14 L8226-03 8/31/2004 Ce-141 -7.70E+O0 2.20E+00 7.40E+O0 WE 14 L8226-03 8/31/2004 Ce-144 S.OOE-01 2.20E+00 7.40E+00 WE 14 L8226-03 8/31/2004 Co-57 -6.40E-0 I 2.90E-0I I .OOE+00 WE 14 L8226-03 8/31/2004 Co-58 2.50E-01 4.30E-01 1.40E+00 WE 14 L8226-03 8n/1/2004 Co-60 -1.20E-OI 3.20E-O1 1.IOE+00 WE 14 L8226-03 831/2004 Cr-51 -7.SOE+00 8.10E+00 2.70E+0I WE 14 L8226-03 8/31/2004 Cs-134 2.00E-01 3.40E-01 1. IOE+00 WE 14 L8226-03 8/31/2004 Cs-137 3.60E-01 2.90E-O1 9.70E-O1 WE '4 L8226-03 8/31/2004 Fe-59 1.90E+00 l .50E+00 5.00E+00 WE 14 L8226-03 8/31/2004 1-131 -2.00E+O0 2.OOE+01 6.90E+0I WE 14 L8226-03 8/31/2004 K-40 2.45E+02 8. 1OE+00 1.70E+OI WE 14 L8226-03 8/3n1/2004 L-140 -2.00E+00 4.80E+00 1.70E+0I WE 14 L8226-03 8/31/2004 Mn-54 I .00E-02 3.20E-0I 1.lOE+00 WE 14 L8226-03 8/31/2004 Nb-95 -1.70E-OI 9.70E-0I 3.30E+00

• Radioactivity detected in sample (i.e, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-59

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCKL) (pCi/L) (pCi/L)

WE 14 L8226-03 8/31/2004 Ru-103 -1.74E+00 7.30E-01 2.50E+00 WE 14 L8226-03 8/31/2004 Ru-106 -2.70E+00 3.00E+00 1.00E+01 WE 14 L8226-03 8/31/2004 Sb-124 -2.70E+00 1.IOE+00 4.OOE+00 WE 14 L8226-03 8/31/2004 Sb-125 l.09E+00 8. OE-0I 2.70E+00 WE 14 L8226-03 8/31/2004 Se-75 -1.70E-01 5.IOE-0I 1.70E+00 WE 14 U8226-03 8/31/2004 Zn-65 9.OOE-01 1.IOE+00 3.60E+00 WE 14 L8226-03 8/31/2004 Zr-95 7.20E-01 7.90E-01 2.60E+00 WE 14 L8391-01 9/28/2oo4 AcTh-228 4.00E-01 1.20E+00 4.10E+00 WE 14 L8391-01 9/28/2004 Ag-108m 9.OOE-02 2.00E-01 6.50E-O1 WE 14 L8391-01 9/28/2004 Ag-ll0m -5.50E-01 3.10E-01 1.IOE+00 WE 14 18391-01 9/28/2004 Ba-140 -s.IOE+O0 3.50E+00 1.20E+01 WE 14 18391-01 9/28/2004 Be-7 7.00E-01 3.30E+00 1.IOE+O1 WE 14 1.391-01 9/28/2004 Ce-141 -1.30E+00 1.40E+00 4.70E+O0 WE 14 L8391-01 9/28/2004 Cc-144 1.80E+00 1.70E+00 s.70E+00 WE 14 L8391-01 9/28noo4 Co-57 1.70E-01 2.20E-01 7.30E-01 WE 14 L8391-01 9/28/2004 Co-58 -9.80E-01 3.20E-01 1.IOE+00 WE 14 L8391-01 9/28/2004 Co-60 -3.50E-01 2.30E-01 7.90E-01 WE 14 L8391-01 9/28/2004 Cr-51 -4.40E+00 6.40E+00 2.20E+01 WE 14 18391-01 9/28/2004 Cs-134 1.SOE-01 2.40E-01 7.90E-01 WE 14 18391-01 9/28/2004 Cs-137 6.00E-02 2.20E-01 7.30E-01 WE 14 18391-01 9/28/2004 Fc-59 3.30E+00 1.20E+00 3.90E+00 WE 14 L8391-01 9l28/2004 1-131 5.OOE+00 1.90E+01 6.40E+01 WE 14 L8391-01 9/28/2004 K-40 2.30E+02 5.90E+00 1.30E+01 WE 14 L8391-01 9/28/2004 La-140 -5.90E+00 4.1OE+00 1.40E+01 WE 14 18391-01 9/28/2004 Mn-54 -9.OOE-02 2.20E-01 7.60E-01 WE 14 1.391-01 9/28/2004 Nb-95 9.70E-01 5.soE-01 1.80E+00 WE 14 L8391-01 9/28/2004 Ru-103 -1.75E+00 7.50E-01 2.60E+00 WE 14 18391-01 9/28/2004 Ru-106 -3.00E+00 2.1OE+00 7.20E+00 WE 14 L8391-01 9/282OO4 Sb-124 -4.20E-01 8.1OE-01 2.80E+00 WE 14 L8391-01 9/28/2004 Sb-125 1.31E+00 6.20E-01 2.00E+00 WE 14 1,8391-01 9/28/2004 Se-75 -2.70E-01 3.SOE-01 1.20E+O0 WE 14 L8391-01 9/28/2004 Zn-65 2.90E-01 7.80E-01 2.60E+00 WE 14 L391-01 9/2812004 Zr-95 9.10E-O1 5.90E-0l 2.OOE+00 WE 14 L8439-03 9/28/2004 H-3 4.90E+02 3.30E+02 1.IOE+03 WE 14 L8410-01 10/26/2004 Acnh-228 2.50E+00 3.90E+00 1.40E+0i WE 14 L84410-01 10/26/2004 Ag-108m 1.00E-01 1.00E+00 3.70E+00 WE 14 L8410-01 10/26/2004 Ag-ll0m 2.20E+00 1.soE+00 5.IOE+00 WE 14 L8410-01 10/26/2004 Ba-140 -4.40E+00 3.30E+00 1.40E+01 WE 14 1.8410-01 10/26/2004 Bc-7 -4.00E+00 1.30E+01 4.70E+01 WE 14 184410-01 10/26/2004 Ce-141 -6.60E+00 2.80E+00 1.OOE+01 WE 14 18410-01 10/26/2004 Cc-144 -1.70E+00 8.IOE+00 2.80E+01 WE 14 18410-01 10/26/2004 Co-57 l.90E+00 1.IOE+00 3.60E+00 WE 14 L8410-01 10/26/2004 Co-58 -4.00E-01 1.30E+00 4.90E+00 WE 14 18410-01 10/26/2004 Co-60 -9.OOE-01 1.20E+00 4.70E+00 WE 14 184410-01 10/26/2004 Cr-51 -1.60E+01 1.70E+01 6.10E+01 WE 14 184410-01 10/26/2004 Cs-134 L.IOE+00 1.IOE+00 3.90E+00

• Radioactivity detected in sample (i e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-60

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/L) (pCil) (pCi/L)

WE 14 L8410-01 10/26/2004 Cs-137 I.90E+00 1.IOE+00 3.60E+00 WE 14 L8410-01 10/26/2004 Fe-59 2.10E+00 3.30E+00 1.20E+01 WE 14 L8410-01 10/262004 1-131 -4.60E+00 7. I OE+00 2.60E+01 WE 14 L8410-01 10/26/2004 K-40 2.43E+02 2.80E+01 5.80E+0 1

• WE 14 L8410-01 10/2612004 IA-140 -5.OOE+00 3.80E+00 I1.60E+01 WE 14 L8410-01 10/26/2004 Mn-54 1.30E+00 1.1I 01+00 3.90E+00 WE 14 18410-01 10/26/2004 Nb-95 -2.30E+00 1.40E+00 5.80Ei-00 WE 14 L84 10-01 10/26/2004 Ru-103 -3.20E+00 I1.50E+00 6.I1OE+00 WE 14 L8410-01 10/26/2004 Ru-106 8.20E+00 7.901E+00 2.70E+01 WE 14 L8410-01 10/26/2004 Sb-124 3.70E+00 2.80E+00 9.30E+00 WE 14 L8410-01 10/26/2oo4 Sb-125 -2. 1OE+00 3.40E+00 I1.30E+01 WE 14 L8410-01 10/26/2004 Se-75 -1.IOE+00 I1.50E+00 5.50E+00 WE 14 L8410-01 10/26/2004 ZI-65 4.OOE+00 4.30E+00 1.40E+01 WE 14 L8410-01 10/26/2004 Zr-95 1.70E+00 2.OOE+00 7. 1OE+00 WE 14 L8757-04 11/30/2004 AcTh-228 2.00E-01 2.20E+00 7.70E+00 WE 14 L8757-04 11/30n2004 Ag-108m -2.10E-01 4.90E-01 1.70E+00 WE 14 L8757-04 11/30/2004 Ag- lOnm 1.05E+00 8.80E-01 3.OOE+00 WE 14 L8757-04 11/30/2004 Ba-140 -1.60E+01 I1.40E+01 5.20E+01 +

WE 14 L8757-04 11/30/2004 Bc-7 4.70E+00 9.40E+00 3.20E+0 I WE 14 L8757-04 11/30/2004 Cc-141 -1.74E+01 4.80E+00 I1.80E+01 WE 14 L8757-04 11/30/2004 Ce-144 6.30E+00 4.50E+00 1.50E+01 WE 14 U8757-04 11/30/2004 Co-57 -3.40E-01 5.90E-01 2.OOE+00 WE 14 L8757-04 11/30/2004 Co-58 5.90E-0I 9.601E-01 3.30E+00 WE 14 L8757-04 11/30/2004 Co-60 7.20E-01 6.40E-01 2.20E+00 WE 14 L8757-04 11/30/2004 Cr-51 -7.00E+00 2.00E+01 7.OOE+01 WE 14 L8757-04 11/30/2004 Cs-134 9.80E-01 7.OOE-01 2.30E+00 WE 14 L8757-04 11/30/2004 Cs-137 8.80E-01 5.70E-01 I1.90E+00 WE 14 L8757-04 11/30/2004 Fe-59 5.40E+00 3.90E+00 1.30E+01 WE 14 LS757-04 11/30/2004 1-131 2.22E+02 S.401E+01 2.70E-i02 WE 14 L8757-04 11/30/2004 K-40 2.56E+02 I1.60E+01 3.00E3+01

• WE 14 L8757-04 11/30/2004 lU-140 -1.80E+01 1.60E+01 6.OOE+01 WE 14 L8757-04 11/30/2004 Mn-54 2.70E-01 6.20E-01 2. 1 01E+00 WE 14 L8757-04 11/30/2004 Nb-95 l.00OE+00 I1.80E+00 6. I OE+00 WE 14 L8757-04 11/30/2004 Ru-103 -2.40E+00 I1.70E+00 6.20E+00 WE 14 L8757-04 11/30/2004 Ru-106 4.00E-01 5.801E+00 2.OOE+01I WE 14 L8757-04 11/30/2004 Sb-124 3.00E-01 2.30E+00 8.40E+00 WE 14 L8757-04 11/30/2004 Sb-125 -1.30E+00 I1.60E+00 5.80E+00 WE 14 L8757-04 11/30/2004 Se-75 -2. 1OE+00 1.IOE+00 4.OOE+00 WE 14 L8757-04 11/30/2004 Zn-65 -3.00E-0O 1.60E+00 5.60E+00 WE 14 L8757-04 11/30/2004 Zr-95 -9.OOE-01 I1.70E+00 6.30E+00 WE 14 L8760-01 12/27/2004 H-3 -4.20E+02 3.201E+02 1.I OE+03 WE 14 L8757-01 12/27/2004 AcTh-228 4.90E+00 I1.90E+00 6.OOE4-00 WE 14 L8757-01 12/27/2004 Ag-108m 1.40E-01 4.OOE-01 I1.40E+00 WE 14 L8757-01 12/27/2004 Ag-I lOm -5.OOE-02 7.OOE-01 2.50E+00 WE 14 L8757-01 12/27/2004 Ba-140 -2.20E+00 2.80E+00 1.OOE+01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-61

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (Pci/[.) (pCi/L) (Pci/L)

WE 14 L8757-01 12/27/2004 Bc-7 -1.90E+00 5.40E+00 1.90E+01 WE 14 L8757-01 12/27/2004 Ce-141 -1.30E+00 1.50E+00 5.30E+00 WE 14 L8757-01 12/27/2004 Ce-144 1.OOE-01 3.40E+00 1.1OE+01 WE 14 L8757-01 12/27/2004 Co-57 I1.40E-01 4.30E-01 1.40E+00 WE 14 L8757-01 12/27/2004 CO-58 -2.5013-01 5.90E-01 2. 10E+00 WE 14 L8757-01 12/27/2004 Co-60 I1.20E-01 5.90E-01 2.10E+00 WE 14 L8757-01 12/27/2004 Cr-51I 1.4013+00 8.40E+00 2.90E+01 WE 14 L8757-01 12/27/2004 Cs-134 -2.20E-01 5.10E-01 1.80E+00 WE 14 L8757-01 12/27/2004 Cs-137 -8.90E-01 5.30E-01 l.90E+00 WE 14 L8757-01 12/27/2004 Fe-59 1.OOE+00 2.101E+00 7.30E+00 WE 14 L8757-01 12/27/2004 1-131 -3.30E+00 6.70E+00 2.30E+01 WE 14 L8757-01 12/27/2004 K-40 2.35E+02 1.30E+01 2.70E+01 WE 14 L8757-01 12/27/2004 La-140 -2.60E+00 3.20E+00 1.20E+01 WE 14 L8757-01 12/27/2004 Mn-54 -2.50E-01 5. IOE-01 1.80E+00 WE 14 L8757-01 12/27/2004 Nb-95 -1.00E-02 7.80E-01 2.70E+00 WE 14 L8757-01 12/27/2004 Ru-103 -7.90E-01 7.60E-01 2.70E+00 WE 14 L8757-01 12/27/2004 Ru-106 4.60E+00 4.90E+00 1.60E+01 WE 14 L8757-01 12/27/2004 Sb-124 5.001E-0 1 1.40E+00 5.00E+00 WE 14 L8757-01 12/27/2004 Sb-125 2.OOE-01 1.30E+00 4.50E+00 WE 14 L8757-01 12/27/2004 Se-75 5. 1OE-0 I 7.70E-01 2.60E+00 WE 14 L8757-01 12/27/2004 Zn-65 -2.40E+00 1.20E+00 4.30E+00 WE 14 L8757-01 12/27/2004 Zr-95 -1 .40E+00 1.IOE+00 3.90E+00 WE 20 L7002-02 1/27/2004 Acnh-228 3.80E+00 I.50E+00 4.90E+00 WE 20 L7002-02 1/27/2004 Ag-108m -2.8013-01 3.80E-01 1.30E+00 WE 20 L7002-02 1/27/2004 Ag-I l1in 3.10OE-01 5.90E-01 2.00E+00 WE 20 L7002-02 1/27/2004 Ba-140 2.40E+00 3.40E+00 1.20E+01 WE 20 L7002-02 1/27/2004 Be-7 -3.OOE+00 6.00E+00 2.1 OE+O I WE 20 L7002-02 1/27/2004 Ce-14 1 1.OOE-01 1.60E+00 5.40E+00 WE 20 L7002-02 1/27/2004 Ce-144 -3.90E+00 3.30E+00 l. IOE+0I WE 20 L7002-02 1/27/2004 Co-57 2.70E-01 4.1 OE-01 1.40E+00 WE 20 L7002-02 1/27/2004 Co-58 -4.70E-01 5.80E-01 2.1OE+00 WE 20 L7002-02 1/27/2004 Co-60 1.90E-01 4.60E-01 1.60E+00 WE 20 L7002-02 1/27/2004 Cr-5 I I1.50E+00 8.80E+00 3.OOE+01 WE 20 L7002-02 1/27/2004 Cs- 134 -1. 12E+00 4.80E-0 I 1.80E+00 WE 20 L7002-02 1/27/2004 Cs- 137 -1.60E-01 4.00E-01 1.40E+00 WE 20 L7002-02 1/27/2004 Fe-59 -3.OOE-01I 1.70E+00 6.00E+00 WE 20 L7002-02 1/27/2004 1-131 4.OOE+00 1.OOE+01 3.50E+O I WE 20 L7002-02 1/27/2004 K-40 3.83E+01 8.00E+00 2.40E+01 WE 20 L7002-02 1/27/2004 La-140 2.70E+00 3.90E+00 1.30E+01 WE 20 L7002-02 1/27/2004 Mn-54 -3.OOE-01 4.40E-01 1.60E+00 WE 20 L7002-02 1/27/2004 Nb-95 8.20E-01I 9.20E-01 3.1 OE+00 WE 20 L7002-02 1/27/2004 Ru-103 -2.05E+00 8.40E-01 3.OOE+00 WE 20 L7002-02 1/27/2004 Ru- 106 8.00E-01 4.30E+00 1.50E+01 WE 20 L7002-02 1/27/2004 Sb- 124 -1 .70E+00 1.30E+00 5.00E+00

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-62

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/L) (pCi/L) (pCi/L)

WE 20 L7002-02 1/27/2004 Sb-125 -4.OOE-01 1.20E+00 4.00E+00 WE 20 L7002-02 1/27/2004 Se-75 -4.00E-01 6.90E-01 2.40E+00 WE 20 L7002-02 1/27/2004 Zn-65 5.70E-0 I 8.90E-01 3.OOE+00 WE 20 L7002-02 1/27/2004 Zr-95 -3.OOE-0 1 l.lOE+00 3.90E+00 WE 20 L7002-04 2/24/2004 Ac'1h-228 2.OOE-0I S.50E+00 2.1OE+O1 WE 20 L7002-04 2/24/2004 Ag-108m -4.OOE-0I 1.30E+00 5.OOE+00 WE 20 L7002-04 2/24/2004 Ag-I lOnm -1.40E+00 1.90E+00 8.OOE+00 WE 20 L7002-04 2/24/2004 Ba-140 -8.OOE-0O 2.60E+00 l. IOE+O I WE 20 L7002-04 2/24/2004 Be-7 1.90E+0O 1.40E+0I 4.50E+01 WE 20 L7002-04 2/24/2004 Ce-141 -2.50E+00 2.60E+00 9.40E+00 WE 20 L7002-04 2/24/2004 Cc-144 2.60E+00 9.20E+00 3.20E+0I WE 20 L7002-04 2/24/2004 Co-57 7.00E-01 I.1OE+00 3.80E+00 WE 20 L7002-04 2/24/2004 Co-58 1.00E+00 1.30E+00 4.90E+00 WE 20 L7002-04 2/24/2004 Co-60 -4.00E-01 1.80E+00 7.40E+00 WE 20 L7002-04 2/24/2004 Cr-51 -2.OOE+00 1.30E+01 4.90E+01 WE 20 L7002-04 2/24/2004 Cs-134 -I .50E+00 1.60E+00 6.70E+00 WE 20 L7002-04 2/24/2004 Cs-137 -3.90E+00 1.70E+00 7.30E+00 WE 20 L7002-04 2/24/2004 Fe-59 -6.OOE-01 3.SOE+00 l.SOE+01 WE 20 L7002-04 2t24/2004 1-131 O.OOE+00 3.00E+00 1.1 OE+OI WE 20 L7002-04 2/24/2004 K-40 4.80E+01 2.30E+01 6.90E+0I WE 20 L7002-04 2/24/2004 La-140 -9.OOE-01 3.00E+00 1.30E+0I WE 20 L7002-04 2/24/2004 Mn-54 -4.00E-01 1.40E+00 5.70E+00 WE 20 L7002-04 2/24/2004 Nb-95 1.20E+00 1.70E+00 6.00E+00 WE 20 L7002-04 2/24/2004 Ru-103 -2.40E+00 1.80E+00 7.1 OE+00 WE 20 L7002-04 2/24/2004 Ru-106 -1.40E+01 1.40E+0I 5.80E+01 WE 20 L7002-04 2/24/2004 Sb-124 -3.80E+00 4.SOE+00 2.00E+01 WE 20 L7002-04 2/24/2004 Sb-125 2.SOE+00 3.70E+00 1.30E+01 WE 20 L7002-04 2/24/2004 Se-75 -3.OOE-OI 1.40E+00 5.30E+00 WE 20 L7002-04 2/24/2004 Zn-65 -3.20E+00 3.60E+00 l.50E+01 WE 20 L7002-04 2/24/2004 Zr-95 3.30E+00 2.40E+00 7.90E+00 WE 20 L7200-02 3/30/2004 AcTh-228 -2. 1OE+00 5.90E+00 2.30E+0I WE 20 L7200-02 3/30/2004 Ag-108m 9.00E-01 1.20E+00 4.40E+00 WE 20 L7200-02 3/30/2004 Ag-l lOm -4.00E-01 l.90E+00 7.40E+00 WE 20 L7200-02 3/30/2004 Ba-140 -1.70E+00 2.70E+00 1.20E+01 WE 20 L7200-02 3/30/2004 Be-7 -1.00E+01 1.30E+0 I 5.OOE+01 WE 20 L7200-02 3/30/2004 Ce-141 -8.00E-01 2.60E+00 9.30E+00 WE 20 L7200-02 3/30/2004 Ce-144 8.OOE-01 9. 1OE+00 3.20E+O I WE 20 L7200-02 3/30/2004 Co-57 -2.OOE-0I 1.1 OE+00 3.90E+00 WE 20 L7200-02 3/30/2004 Co-58 4.00E-0I 1.30E+00 4.90E+00 WE 20 L7200-02 3/30/2004 Co-60 2.00E-01 1.40E+00 5.60E+00 WE 20 L7200-02 3/30/2004 Cr-51 -3.40E+01 l.SOE+01 5.90E+01 WE 20 L7200-02 3/30/2004 Cs-134 l.OOE-01 1.70E+00 6.50E+00 WE 20 L7200-02 3/30/2004 Cs-137 1.20E+00 1.40E+00 4.90E+00 WE 20 L7200-02 3/30/2004 Fe-59 2.20E+00 S. l OE+00 1.90E+01 WE 20 L7200-02 3/30/2004 1-131 -3.20E+00 4. 1OE+00 1.60E+01 WE 20 L7200-02 3/30/2004 K-40 4.90E+0I 2.SOE+0I 8.00E+0O

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-63

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (Pci/L) (pCi/L) (pCi/L)

WE 20 L7200-02 3/30/2004 La-140 -2.OOE+00 3. 1OE+00 1.40E+0lI WE 20 L7200-02 3/30/2004 Mn-54 -I1.90E+00 1.40E+00 5.90E+00 WE 20 L7200-02 3/30/2004 Nb-95 -4.OOE-01 I1.50E+00 6.10E+00 WE 20 L7200-02 3/30/2004 Ru-103 -1.OOE+00 I1.30E+00 5.40E+00 WE 20 L7200-02 3/30/2004 Ru-106 -5.OOE+00 I. I OE+0 I 4.30E+01 WE 20 L7200-02 3/30/2004 Sb-124 1.2013+00 3.50E+00 I1.40E+0I WE 20 L7200-02 3/30/2004 Sb-125 1.1I OE+00 3.80E+00 I1.40E+01 WE 20 L7200-02 3/30/2004 Se-75 -I1.60E+00 I1.70E+00 6.30E+00 WE 20 L7200-02 3/30/2004 Zn-65 3.50E+00 3.50E+00 1.20E+01 WE 20 L7200-02 3/30/2004 Zr-95 4.20E+00 2.40E+00 7.70E+00 WE 20 L7300-02 3/30/2004 H-3 2.8OE+02 3.20E+02 I .OOE+03 WE 20 L7367-02 4/27/2004 Aclb-228 -3.50E+00 5.50E+00 2.20E-*0l WE 20 L7367-02 4/27/2004 Ag-lOSm -6.OOE-01 1.20E+00 4.40E+00 WE 20 L7367-02 4/27/2004 Ag-I lOin 4.OOE-01 1.90E+00 7.2013+00 WE 20 L7367-02 4/27/2004 Ba-140 0.OOE+00 2.80E+00 1.20E+01 WE 20 L7367-02 4/27/2004 Bc-7 -2.OOE+00 1.IOE+01 4.IOE1+0 I WE 20 L7367-02 4/27/2004 Cc-141 -I.00E+00 2.50E+00 8.90E+00 WE 20 L7367-02 4/27/2004 Ce-144 8.00E-01 8.3013+00 2.90E+01 WE 20 L7367-02 4/27/2004 Co-57 -5.00E3-01 I .OOE+00 3.60E+00 WE 20 L7367-02 4/27/2004 Co-58 I1.30E+00 I1.50E+00 5.10OE+O0 WE 20 L7367-02 4/27/2004 Co-60 -I1.70E+00 I1.90E+00 7.90E+00 WE 20 L7367-02 4/27/2004 Cr-5 1 -3.OOE+00 1.60E+01 5.60E+01 WE 20 L7367-02 4/27/2004 Cs-134 2.90E+00 I1.50E+00 4.70E+00 WE 20 L7367-02 4/27/2004 Cs-137 2.30E+00 1.60E+00 5.30E+00 WE 20 L7367-02 4/27/2004 Fc-59 -I1.90E+00 3.90E+00 1.60E+01 WE 20 L7367-02 4/27/2004 1-131 -5.70E+00 4.5013+00 1.70E+01 WE 20 L7367-02 4/27/2004 K-40 -1.30E+01 2.0013+01 7.90E+01 WE 20 L7367-02 4/27/2004 La-140 0.OOE+00 3.30E+00 1.30E+01 WE 20 L7367-02 4/27/2oo4 Mn-54 -5.OOE-01I 1.20E+00 5.OOE+00 WE 20 L7367-02 4/27/2004 Nb-95 -2.101E+00 I1.30E+00 5.90E+00 WE 20 L7367-02 4/27/2004 Ru-103 -2.50E+00 I1.40E+00 5.90E+00 WE 20 L7367-02 4/27/2004 Ru-106 I1.501E+01 I.00E+01 3.30E+0 I WE 20 L7367-02 4/27/2004 Sb-124 2.1OE+00 3.60E+00 I1.4013+01 WE 20 L7367-02 4/27/2004 Sb-125 -2.OOE+00 3.40E+00 1.30E+01 WE 20 L7367-02 4/27/2004 Se-75 -1.OOE-01 I1.501E+00 5.30E+00 WE 20 L7367-02 4/27/2004 Zn-65 0.00E+00 3.1OE+00 I1.20E+01 WE 20 L7367-02 4/27/2004 Zr-95 I. IOE+00 2.80E+00 I.00E+01 WE 20 L7726-02 5/25/2004 AcTh-228 0.00E+00 I1.90E+00 6.30E+00 WE 20 L7726-02 5/25/2004 Ag-108m -4.30E-01 3.OOE-01 I.OOE+00 WE 20 L7726-02 5/25/2004 Ag-I lOm 3.70E-01 5.401E-0 I I1.80E+00 WE 20 L7726-02 5/25/2004 Ba-140 4.60E+00 8. 1OE+00 2.80E+01 +

WE 20 L7726-02 5/25/2004 Be-7 I1.80E+00 5.20E+00 I.8OE+01 WE 20 L7726-02 5/25/2004 Ce-141 1.60E+00 2.30E+00 7.70E+00 WE 20 L7726-02 5/25/2004 Ce-144 2.60E+00 3.20E3+00 I. IOE+01 WE 20 L7726-02 5/25/2004 Co-57 I.OOE-01 3.20E-01 I. IOE+00 WE 20 L7726-02 5/25/2004 Co-58 -2.60E-0 1 5.40E-01 1.9013+00

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (KUiL) (pCi/L) (pCi/L)

WE 20 L7726-02 5/25/2004 Co60 6.50E-01 4.OOE-01 I1.30E+00 WE 20 L7726-02 5/25/2004 Cr-51 0.00E+00 1.I OE+01I 3.90E+01 WE 20 L7726-02 5/25/2004 Cs-1 34 5.20E-01 3.70E-01 1.20E+00 WE 20 L7726-02 5/25/2004 Cs-137 -2.90E-01 3.50E-0 I I1.20E+00 WE 20 L7726-02 5/25/2004 Fe-59 - 1.20E+00 2.30E+00 8. 1OE+00 WE 20 L7726-02 5/25/2004 I-131 8.60E+01 4.60E+01 I1.50E+02 WE 20 L7726-02 5/25/2004 K40 I1.621E+01 6.60E+00 2. 1OE+0 I WE 20 L7726-02 5/25/2004 La-140 5.3013+00 9.30E+00 3.20E+01 WE 20 L7726-02 5/25/2004 Mn-54 2.90E-O I 3.70E-01 I1.30E+O0 WE 20 L7726-02 5/25/2004 Nb-95 I1.03E+O0 9.70E-01 3.20E+00 WE 20 L7726-02 5/25/2004 Ru-103 -2.92E+00 8.80E-01 3.20E+00 WE 20 L7726-02 5/25/2004 Ru-106 -9.OOE-01 3.60E+00 I1.20E+0I WE 20 L7726-02 5/25/2004 Sb-124 1.50E+00 1.50E+00 5.20E+00 WE 20 L7726-02 5/25/2004 Sb-125 -9.20E-01 9.60E-01 3.30E+00 WE 20 L7726-02 5/25/2004 Se-75 I1.09E+00 6.2013-01 2.OOE+00 WE 20 L7726-02 5/25/2004 Zn-65 5.OOE-0 1 1. IOE+00 3.8OE+00 WE 20 L7726-02 5/25/2004 Zr-95 -2.32E+00 9.70E-01 3.50E+00 WE 20 L7877-02 6/29/2004 H-3 -7.70E+02 5.30E+02 I .SOE+03 WE 20 L7725-02 6/29/2004 AcTh-228 3.60E+00 3.80E+00 I1.30E+01 WE 20 L7725-02 6/29/2004 Ag-lOSm -9.20E-01 8.50E-01 3.20E-e00 WE 20 L7725-02 6/29/2004 Ag-l lOm -3.50E+00 I1.30E+00 5.80E+00 WE 20 L7725-02 6/29/2004 Ba-140 -4.00E+00 2.70E+00 1.20E+01 WE 20 L7725-02 6/29/2004 Be-7 -6.00E+00 1.00E+01 3.SOE+Ol WE 20 L7725-02 6/29/2004 Cc-141 -I1.80E+00 2.60E+00 9. IOE+00 WE 20 L7725-02 6/29/2004 Ce-144 1.52E+01 7.40E+00 2.40E+01 WE 20 L7725-02 6/29/2004 Co-57 4.20E-Ol 9.60E-01 3.30E+00 WE 20 L7725-02 6/29/2004 CD-58 -4.OOE-01 1.00E+00 3.90E+00 WE 20 L7725-02 6/29/2004 Co-60 1.60E-01 8.60E-01 3.30E+00 WE 20 L7725-02 6/29/2004 Cr-5I IL.0E+00 1.40E+01 5. 1OE+0I1 WE 20 L7725-02 6/29/2004 Cs-134 0.00E+00 1.IOE+00 4. 1OE+00 WE 20 L7725-02 6/29/2004 Cs-137 -2.90E-0 I 8.80E-01 3.40E+00 WE 20 L7725-02 6/29/2004 Fe-59 6.70E+00 3.00E+00 8.90E+00 WE 20 L7725-02 6/29/2004 1-131 1.02E+01 6.20E+00 2.OOE+01 WE 20 L7725-02 6/29/2004 K-40 2.70E+01 I1.70E+01 5.50E+01 WE 20 L7725-02 6/29/2004 La-140 -4.60E+00 3. 1OE+00 I1.40E+01 WE 20 L7725-02 6/29/2004 Mn-54 -1I.051E+00 9.80E-01 3.90E-I00 WE 20 L7725-02 6/29/2004 Nb-95 -1.60E+00 I1.40E+00 5.60E+O0 WE 20 L7725-02 6/29/2004 Ru-103 -I.OOE-Ol I1.50E+00 5.50E+00 WE 20 L7725-02 6/29/2004 Ru-106 -5.40E+00 9.80E+00 3.70E+01 WE 20 L7725-02 6/29/2004 Sb-124 3.00E+00 3.00E+00 I.I OE+0 I WE 20 L7725-02 6/29/2004 Sb-125 -3.50E+00 3.OOE+00 1.I OE+0 I WE 20 L7725-02 6/29/2004 Se-75 -I .00E+00 1.50E+00 5.40E+O0 WE 20 L7725-02 6/29/2004 Zn-65 -5.1IOE+00 2.40E+00 I.00E+01 WE 20 L7725-02 6/29/2004 Zr-95 -1.50E+00 I1.80E+00 7.20E+00 WE 20 L8226-02 7/27/2004 AcTh-228 I.I OE+00 I1.70E+00 5.70E+00 WE 20 L8226-02 7/27/2004 Ag-lOSm -2.70E-0 I 2.90E-01 I .OOE-'00

• Radioactivity detected in sample (i.e, concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-65

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCi/L) (pCi/L) (pCUL)

WE 20 L8226-02 7/27n2004 Ag-l lbm 7.60E-01 5.50E-01 1.80E+00 WE 20 L8226-02 7n27/2004 Ba-140 -4.90E+0I 3.20E+01 1.20E+02 +

WE 20 L8226-02 7(27/2004 Be-7 -1.03E+01 8.1OE+00 2.80E+01 WE 20 L8226-02 7/27(2004 Ce-141 -2.00E+00 3.60E+00 1.20E+01 WE 20 L8226-02 7/27/2004 Ce-144 7.00E-01 2.70E+00 9. OE+00 WE 20 L8226-02 7/27/2004 Co-57 2.80E-01 3.60E-01 1.20E+00 WE 20 L8226-02 7/27n2004 Co-58 -9.80E-01 7.10E-01 2.SOE+00 WE 20 L8226-02 7/27(2004 Co-60 -4.101E-01 3.20E-01 1.20E+00 WE 20 L8226-02 7(27/2004 Cr-51 2.00E+01 2.20E+01 7.SOE+01 WE 20 18226-02 7/27/2004 Cs-134 -5.1OE-OI 3.90E-01 1.40E+00 WE 20 L8226-02 7/27/2004 Cs-137 LOOE-02 3.20E-0I .IOE+00 WE 20 L8226-02 7/27/2004 Fe-59 -2.40E+00 2.70E+00 9.60E+00 WE 20 L8226-02 7(27(2004 1-131 -1.90E+02 4.50E+02 1.50E+03 WE 20 L8226-02 7/27(2004 K-40 7.39E+01 6.90E+00 1.90E+01 WE 20 L8226-02 7(27/2004 La-140 -5.60E+01 3.70E+01 1.40E+02 WE 20 L8226-02 7/27/2004 Mn-54 -1.20E-01 4.00E-01 1.40E+00 WE 20 18226-02 7/27/2004 Nb-95 2.00E+00 1.70E+00 s.50E+00 WE 20 L8226-02 7/27(2004 Ru-103 -1.50E+00 2.30E+00 7.70E+00 WE 20 L8226-02 7/27/2004 Ru-106 -3.20E+00 3.70E+00 1.30E+01 WE 20 L8226-02 7/27(2004 Sb-124 2.40E+00 1.70E+00 5.70E+00 WE 20 L8226-02 7(27(2004 Sb-125 -1.26E+00 9.60E-O 3.30E+00 WE 20 L8226-02 7/27/2004 Se-75 3.60E-01 7.30E-01 2.40E+00 WE 20 L8226-02 7/27/2004 Zn-65 -3.24E+00 9.20E-01 3.SOE+00 WE 20 L8226-02 7/27/2004 Zr-95 1.70E+00 1.40E+00 4.50E+00 WE 20 18226-04 8/31/2004 AcTh-228 7.OOE-01 1.50E+00 5. IOE+00 WE 20 L8226-04 8/31/2004 Ag-lOSm -L.00E-02 2.50E-01 8.soE-01 WE 20 L8226-04 8/31/2004 Ag-ll0m 2.00E-01 3.80E-01 1.30E+00 WE 20 L8226-04 8/31(2004 Ba-140 -4.20E+00 4.20E+00 1.soE+01 WE 20 18226-04 8/3/2004 Be-7 -6.00E-01 4.20E+00 1.40E+01 WE 20 L8226-04 8/31/2004 Cc-141 L.OOE+00 1.30E+00 4.20E+00 WE 20 18226-04 8/31/2004 Ce-144 .OOE+00 2.20E+00 7.30E+00 WE 20 L8226-04 8/31/2004 Co-57 6.00E-01 2.90E-01 9.30E-01 WE 20 L8226-04 8/31/2004 Co-58 I.IOE-0l 4.1OE-0I 1.40E+00 WE 20 L8226-04 8/31(2004 Co-60 -1.60E-01 3.00E-0I L.00E+00 WE 20 L8226-04 8/31/2004 Cr-51 4.70E+00 8.20E+00 2.70E+0I WE 20 L8226-04 8/31/2004 Cs-134 4.40E-0I 2.90E-OI 9.50E-01 WE 20 L8226-04 8/31/2004 Cs-137 3.60E-01 2.80E-01 9.30E-01 WE 20 L8226-04 8/31(2004 Fe-59 1.70E+00 1.60E+00 5.50E+00 WE 20 L8226-04 8/31(2004 1-131 -9.OOE+00 2.OOE+01 6.80E+01 WE 20 L8226-04 8/31(2004 K-40 4.98E+01 5.60E+00 1.60E+OI WE 20 L8226-04 8/31(2004 La-140 -4.80E+00 4.90E+00 1.70E+01 WE 20 L8226-04 8/31/2004 Mn-54 -4.00E-01 2.90E-01 1.00E+00 WE 20 L8226-04 8/31/2004 Nb-95 -2.17E+00 8.soE-01 3.00E+00 WE 20 L8226-04 8/31/2004 Ru-103 -1.92E+00 6.00E-01 2.10E+00 WE 20 L8226-04 8/31(2004 Ru-106 -2.20E+00 2.80E+00 9.60E+00

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-66

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (KUaL) (pCi/L) (pCi/L)

WE 20 L8226-04 8/31/2004 Sb-124 2.80E+00 1.IOE+00 3.50E+00 WE 20 L8226-04 8/31/2004 Sb-125 4.40E-01 8.I1OE-01I 2.70E+00 WE 20 L8226-04 8/31/2004 Se-75 -8.1IOE-01 4.50E-01I I1.50E+00 WE 20 L8226-04 8/31/2004 Zn-65 -5.OOE-02 9.60E-01 3.30E+00 WE 20 L8226-04 8/31/2004 Zr-95 -2.9013-01 7.50E-01 2.60E+00 WE 20 L8391-02 9/28/2004 Aclb-228 -8.0013-01 1.50E+00 5.20E+00 WE 20 L8391-02 9/28/2004 Ag-108m 9.OOE-02 2.50E-01 8.30E-01 WE 20 L8391-02 9/28/2004 Ag-I lOm -6.OOE-02 4. 1OE-01I I1.40E+00 WE 20 L8391-02 9/28/2004 Ba-140 3.OOE-01I 4.00E+00 I1.401E+01I WE 20 L8391-02 9/28/2004 Be-7 -3.40E+00 4.20E+00 1.40E+01I WE 20 L8391-02 9/28/2004 Ce-141 -5.OOE-01 I1.50E+00 5.20E+00 WE 20 L8391-02 9/28/2004 Ce-144 2.20E+00 2.20E400 7.30E+00 WE 20 L8391-02 9/28/2004 Co-57 6.0013-02 2.90E-01 9.60E-01 WE 20 L8391-02 9/28/2004 Co-58 -4.60E-01 4.4013-01 1.50E+00 WE 20 L8391-02 9/28/2004 Co-60 -1.70E-01 2.90E-01 I.OOE+00 WE 20 L8391-02 9/28/2004 Cr-5I 2.70E+00 7.90E+00 2.70E-e01 WE 20 L8391-02 9/28/2004 Cs-134 -1.00E-02 3.IOE1-01I 1.IOE+00 WE 20 L8391-02 9/28/2004 Cs-137 5.OOE-02 2.70E-01 9.30E-01 WE 20 L8391-02 9/28/2004 Fe-59 2.90E+00 I1.401E+00 4.60E+00 WE 20 L8391-02 9/28/2004 1-131 -3.30E+01 2.OOE+01 6.90E+01 WE 20 L8391-02 9/28/2004 K-40 4.43E+01 5.70E+00 I1.70E+01

• WE 20 L8391-02 9/28/2004 La-140 3.OOE-01 4.60E+00 I1.60E+01 WE 20 L8391-02 9/28/2004 Mn-54 -3.OOE-02 3.1OE-0 I I. IOE+00 WE 20 L8391-02 9/28/2004 Nb-95 -3.OOE-01 1.00E+00 3.5013+00 WE 20 L8391-02 9/28/2004 Ru-103 -2.69E+00 7. 101-0 I 2.50E+00 WE 20 L8391-02 9/28/2004 Ru-106 4.OOE-01 2.90E+00 9.80E+00 WE 20 L8391-02 9/28/2004 Sb-124 -1.00E+00 1.IO01+00 3.80E+00 WE 20 L8391-02 9/28/2004 Sb-125 *3.0013-01 7.80E-01 2.90E+00 WE 20 L8391-02 9/28/2004 Se-75 2.50E-01 5.0013-01 I1.70E+00 WE 20 L8391-02 9/28/2004 Zn-65 -1.70E-01 9.90E-01 3.40E+00 WE 20 L8391-02 9/28/2004 Zr-95 2.80E-01 7.8013-01 2.60E+00 WE 20 L8439-02 9/28/2004 H-3 -8.OOE+01 3.20E+02 1.IOE+03 WE 20 18410-02 10/26/2004 AcTh-228 3.40E+00 4.10OE+00 1.40E+01I WE 20 L8410-02 10/26/2004 Ag-108m 4.OOE-01 9.60E-01 3.40E+00 WE 20 L8410-02 10/26/2004 Ag- lOnm -1.70E+00 1.60E+00 6.40E+00 WE 20 L8410-02 10/26/2004 Ba-140 5.OOE+00 2.90E+00 9.OOE+00 WE 20 L8410-02 10/26/2004 Be-7 8.00E+00 I1.30E+01 4.40E+0 1 WE 20 L8410-02 10/26/2004 Ce-141 -6.50E+00 2.80E+00 1.1I OE+0 1 WE 20 L8410-02 10/26/2004 Ce-144 5.50E+00 8.70E+00 3.OOE+01 WE 20 L8410-02 10/26/2004 Co-57 I1.30E+00 1.1I OE+00 3.70E+00 WE 20 L8410-02 10/26/2004 Co-58 -I1.401E+00 1.40E+00 5.70E+00 WE 20 L8410-02 10/26/2004 Co-60 I1.60E+00 I1.30E+00 4.50E+00 WE 20 L8410-02 10/26/2004 Cr-51 2.OOE+00 I1.70E+01 5.90E+01 WE 20 L8410-02 10/26/2004 Cs-134 -1.30E+00 1.40E+00 5.40E+00 WE 20 L8410-02 10/26/2004 Cs-137 -1.60E+00 I1.2011+00 4.70E+00 WE 20 L8410-02 10/26/2004 Fe-59 -4.80E+00 2.90E+00 I1.40E+01

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-67

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCilL) (pCi/L) (pCUL)

WE 20 L8410-02 10/26/2004 1-131 4.90E+00 7.50E+00 2.60E+0I WE 20 L8410-02 10/26/2004 K-40 4.50E+01 1.80E+01 5.30E+01 WE 20 L8410-02 10/26/2004 La-140 5.80E+00 3.30E+00 1.OOE+01 WE 20 L8410-02 10/26/2004 Mn-54 -4.OOE-01 1.20E+00 4.60E+00 WE 20 L8410-02 10/26/2004 Nb-95 -2.40E+00 1.80E+00 7.20E+00 WE 20 L8410-02 10/26/2004 Ru-103 -4.30E+00 1.80E+00 7.30E+00 WE 20 L8410-02 10/26/2004 Ru-106 -7.00E+00 1.20E+01 4.60E+01 WE 20 L8410-02 10/26/2004 Sb-124 4.70E+00 3.70E+00 1.30E+01 WE 20 L8410-02 10/26/2004 Sb-125 3.70E+00 3.30E+00 1.IOE+0I WE 20 L,8410-02 10/26/2004 Se-75 2.00E-01 1.80E+00 6.30E+00 WE 20 L8410-02 10/26/2004 Zn-65 -8.40E+00 3.40E+00 1.40E+01 WE 20 L8410-02 10/26/2004 Zr-95 1.60E+00 2.30E+00 8.00E+00 WE 20 L8757-05 11/30/2004 Acnh-228 2.70E+00 2.30E+00 8.60E+00 WE 20 L8757-05 11/30/2004 Ag-108m 2.20E-01 4.90E-01 1.70E+00 WE 20 L8757-05 11/30/2004 Ag- lOnm -2.20E-01 9.30E-01 3.30E+00 WE 20 L8757-05 11/30/2004 Ba-140 -3.30E+0I I.50E+01 6.00E+01 WE 20 L8757-05 11/30/2004 Be-7 -4.30E+00 8.70E+00 3.1OE+OI WE 20 L8757-05 11/30/2004 Ce-141 3.30E+00 2.90E+00 9.60E+00 WE 20 L8757-05 11/30/2004 Ce-144 1.70E+00 3.90E+00 1.30E+OI WE 20 L8757-05 11/30/2004 Co-57 3.30E-01 4.90E-01 1.70E+00 WE 20 L8757-05 11/30/2004 Co-58 -9.00E-01 9.80E-01 3.60E+00 WE 20 L8757-05 11/30/2004 Co-60 9.90E-01 6.60E-01 2.20E+00 WE 20 L8757-05 11/30/2004 Cr-51 1.20E+01 1.70E+01 5.60E+01 WE 20 L8757-05 11/30/2004 Cs-134 -4.30E-01 7.40E-01 2.70E+00 WE 20 L8757-05 11/30/2004 Cs-137 -9.00E-02 6.60E-01 2.30E+00 WE 20 L8757-05 11/30/2004 Fe-59 -8.00E-01 3.60E+00 1.30E+0I WE 20 L8757-05 11/30/2004 1-131 2.50E+01 7.1OE+01 2.40E+02 WE 20 L8757-05 11/30/2004 K-40 1.07E+02 1.40E+01 3.70E+01 WE 20 L8757-05 11/30/2004 La-140 -3.70E+01 1.70E+01 6.90E+0I WE 20 L8757-05 11/30/2004 Mn-54 1.20E-01 6.40E-01 2.20E+00 WE 20 L8757-05 11/30/2004 Nb-95 -4.90E+00 2.1OE+00 7.80E+00 WE 20 L8757-05 11/30/2004 Ru-103 -2.90E+00 1.40E+00 5.30E+00 WE 20 L8757-05 11/30/2004 Ru-106 1.70E+00 5.50E+00 1.90E+01 WE 20 L8757-05 11/30/2004 Sb-124 -2.1OE+00 2.80E+00 I.00E+0I WE 20 L8757-05 11/30/2004 Sb-125 -1.IOE+00 1.50E+00 5.30E+00 WE 20 L8757-05 11/30/2004 Se-75 -1.03E+00 8.50E-01 3.00E+00 WE 20 L8757-05 11/30/2004 Zn-65 -9.00E-0 I 1.50E+00 5.40E+00 WE 20 L8757-05 11/30/2004 Zr-95 2.40E+00 1.80E+00 5.90E+00 WE 20 L8757-02 12/27/2004 Ach-228 -2.20E+00 2.20E+00 7.90E+00 WE 20 L8757-02 12/27/2004 Ag-108m l.50E-0I 4.70E-01 1.60E+00 WE 20 L8757-02 12/27/2004 Ag-l lOmn -3.80E-01 7.30E-01 2.70E+00 WE 20 L8757-02 12/27/2004 Ba-140 1.90E+00 3.30E+00 1.20E+0I WE 20 L8757-02 12/27/2004 Be-7 -4.00E-01 6.30E+00 2.20E+01 WE 20 L8757-02 12/27/2004 Ce-141 -1.90E+00 2.30E+00 7.90E+00 WE 20 L8757-02 12/27/2004 Ce-144 1.60E+00 3.OOE+00 I.00E+01 WE 20 L8757-02 12/27/2004 Co-57 I.IOE-0I 3.80E-01 1.30E+00

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-68

Maine Yankee Nuclear Power Station Radiological Environmental Monitoring Program Summary of 2004 Data SAMPLE END CONC STD.DEV. MDC TYPE STATION LSN DATE NUCLIDE (pCiIL) (pCi/L) (pCi/L)

WE 20 L8757-02 12/27/2004 Co-S8 4.40E-0I 6.70E-0 I 2.30E+00 WE 20 L8757-02 12v27/2004 Co-60 -1.38E+00 6.90E-0 I 2.70E+00 WE 20 L8757-02 12/27/2004 Cr-51 -4.70E+00 8.20E+00 2.90E+0 I WE 20 L8757-02 12/27/2004 Cs-134 -2.20E-0 I 6.40E-0 I 2.30E+00 WE 20 L8757-02 12/27/2004 Cs-137 -1.05E+00 5.40E-0 I 2.00E+00 WE 20 L8757-02 12/27/2004 Fe-59 3.1OE+00 2.30E+00 7.70E+00 WE 20 L8757-02 12/27/2004 1-131 3.OOE-01 6.60E+00 2.30E+01 WE 20 L8757-02 12/27/2004 K-40 2.40E+01 1.I OE+O I 3.40E+01 WE 20 L8757-02 12/27/2004 la-140 2.20E+00 3.80E+00 1.30E+0I WE 20 L8757-02 12/27/2004 Mn-54 -2. 1OE-0I 5.90E-01 2.1 OE+00 WE 20 L8757-02 12/27/2004 Nb-95 -1.60E-01 9.OOE-0 I 3.20E+00 WE 20 L8757-02 12/27/2004 Ru-103 -1.03E+00 9. IOE-0I 3.30E+00 WE 20 L8757-02 12/27/2004 Ru-106 -1.50E+00 4.90E+00 1.70E+0O WE 20 L8757-02 12/27/2004 Sb-124 2.30E+00 1.90E+00 6.30E+00 WE 20 L8757-02 12/27/2004 Sb-125 6.OOE-01 1.40E+00 4.80E+00 WE 20 L8757-02 12/27/2004 Se-75 8.00E-0 I 6.80E-01 2.30E+00 WE 20 L8757-02 12/27/2004 Zn-65 5.OOE-01 1.30E+00 4.50E+00 WE 20 L8757-02 12/27/2004 Zr-95 7.00E-0 I 1.30E+00 4.30E+00 WE 20 L8760-02 12/27/2004 H-3 3.OOE+02 3.30E+02 1.I OE+03

• Radioactivity detected in sample (i.e., concentration > 3 X standard deviation)

+ Minimum Detectable Concentration > Lower Limit of Detection Requirement A-69