ML13184A139

an Aerial Radiological Survey of the Seabrook Nuclear Station and Surrounding Area - July 1988

ML13184A139
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Site:	Seabrook
Issue date:	09/30/2013
From:	Guss P P EG&G Energy Measurements
To:	Office of Nuclear Reactor Regulation
Garry S M, NRR/DRA, 301-415-2766
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DE-AC08-88NV10617, UC-41 EGG-10617-1013
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n EGc.G THE REMOTE SENSING LABORATORY EGG-1 0617-1013 UC-41 SEPTEMBER 1989 OPERATED FOR THE U.S. DEPARTMENT OF ENERGY BY EG&G/EM AN AERIAL RADIOLOGICAL SURVEY OF THE SEABROOK NUCLEAR STATION AND SURROUNDING AREA SEABROOK, NEW HAMPSHIRE DATE OF SURVEY: JULY 1988 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government.

Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness , or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process , or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation , or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Printed in the United States of America. Available to DOE and DOE contractors from: Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, Tennessee 37831 Prices available from (615) 576-8401, FTS 626-8401.

Available to the public from: National Technical Information Service U.S. Department of Commerce 5285 Port Royal Road Springfield , Virginia 22161 Price codes Printed copy: A03 Microfiche

A01 n EGc.G AN AERIAL RADIOLOGICAL SURVEY OF THE SEABROOK NUCLEAR STATION AND SURROUNDING AREA SEABROOK, NEW HAMPSHIRE DATE OF SURVEY: JULY 1988 P. P. Guss Project Scientist REVIEWED BY W. J. Tipton mnt Manager Aerial Measurements Operations This Document is UNCLASSIFIED ctK. Mitchell Classification Officer EGG-10617-1013 SEPTEMBER 1989 This work was performed by EG&G/EM for the United States Department of Energy, Office of Nuclear Safety, and the United States Nuclear Regulatory Commission under Contract Number DE-AC08-88NV1 0617.

ABSTRACT An aerial radiological survey was conducted over the Seabrook Nuclear Station, Seabrook, New Hampshire, during the period 6 July through 14 July 1988. The purpose of the 247-square-kilometer (96-square-mile) survey was to document the terrestrial gamma environment of the station and surrounding area. An exposure rate contour map at 1 meter above ground level (AGL) was constructed from the gamma data and overlaid on an aerial photograph and map of the area. Exposure rates measured in the area typically ranged from 9 to 12 microroentgens per hour (f..LR/h).

In areas where water shielded the earth, lower exposure rates were measured.

Ground-based exposure rate measurements and soil samples were obtained to support the aerial data. Oblique aerial photographs of the station were also acquired during the survey. 2 CONTENTS Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Sections 1.0 Introduction 2.0 Site Description

.... 3.0 Natural Background . 4.0 Survey Equipment and Methods ............................ . 4.1 Aircraft System ...........................

......... . 4.2 Data Van ........................................ . 4.3 Survey Method ............

........................ . 4.4 Aerial Photographs

....................

............. . 4.5 Ground-Based Measurements

.......................... . 5.0 General Data Reduction

........................

......... . 5.1 Gross Count Rate .......................

........... . 5 5 5 5 5 7 7 8 8 8 8 5.2 Spectral Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.0 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1 Exposure Rate Contour Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.2 Spectral Window Contour Map ..... . ........... 10 6.3 Ground-Based Measurement Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.0 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figures General View of the Seabrook Nuclear Station and Surrounding Area Showing the Station, Survey Boundary, and URS Transponder Locations for the July 1988 Survey ..........

................

.......... . 2 MBB B0-105 Helicopter with Detector Pods .................... . 3 Mobile Computer Processing Laboratory

...................... . 4 Terrestrial Gamma Exposure Rate Contour Map from the July 1988 Survey of the Seabrook Nuclear Station and Ground-Based Measurement Locations

.......................................... . 5 Typical Gamma Energy Spectrum Obtained within the Survey Boundary 6 7 7 9 Minus a Background Spectrum Taken over Great Bay . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3 Table 1 Comparison Between Ground-Based and Aerial Measurements . . . . . . . . . . . . . . . . . . . . . 12 Appendix A Survey Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4

1.0 INTRODUCTION

An aerial radiological survey was conducted over the Seabrook Nuclear Station and surrounding area from 6 July to 14 July 1988 by EG&G Energy Measurements, Inc. (EG&G/EM) of Las Vegas, Nevada. The purpose of the survey was to map the background terrestrial gamma exposure rates around the station. This was achieved by flying survey lines at 152-meter (500-foot) intervals at an altitude of 91 meters (300 feet) over an area of 24 7 square kilometers (96 square miles). An exposure rate contour map of the area was derived from the aerial data. In addition, ground-based exposure rate measurements and soil samples were obtained to support the aerial measurements.

Oblique aerial photographs of the station were also taken during the survey. The survey was sponsored by the United States Department of Energy (DOE), Office of Nuclear Safety (ONS), and the United States Nuclear Regulatory Commission (NRC). EG&G/EM, a prime contractor of the DOE, has conducted aerial radiological surveys for the DOE, the NRC, and other U.S. government agencies for more than 25 years. The basic uti I ity of the aerial survey is that the coverage of the survey area approaches 100 percent. 2.0 SITE DESCRIPTION The survey boundary is depicted in Figure 1. The area is a 247-square-kilometer (96-square-mile) rectangle.

The 19-kilometer by 13-kilometer (12-mile by 8-mile) survey region extends parallel to the sea coast 9.5 kilometers north and south of the Seabrook Station, 8 kilometers west of the station, and 5 kilometers east of the station. The coast I i ne forms the eastern boundary.

The nuclear station is located in the town of Seabrook, New Hampshire, and is situated on a tidal basin which extends 5 kilometers inland from the Atlantic Ocean. The surrounding coastal terrain varies in elevation from sea-level to maximum elevations of mately 100 meters. Presently, only a single Westinghouse PWR-type reactor operated by the New Hampshire Yankee Power Company is at the site. The maximum electrical output of the unit is 1,150 megawatts.

During the survey period, the station had not yet been licensed to operate.1 5 3.0 NATURAL BACKGROUND Natural background originates from three primary sources. They are: radioactive elements present in the earth, airborne radon, and cosmic rays entering the earth's atmosphere from space. The natural terrestrial radiation levels depend upon the type of soil and bedrock immediately below and surrounding the point of measurement.

In urban areas, the levels are also dependent on the natureofstreetand building materials.

The gamma radiation originates primarily from the uranium decay chain, the thorium decay chain, and active potassium.ln general, local concentrations of these nuclides produce radiation levels at the surface of the earth typically ranging from 1 to 15 11R/h (9 to 130 mrem/yr).2 Some areas with high uranium and/or thorium concentrations in the surface minerals may exhibit even higher levels. Both the uranium and thorium radioactive decay chains contain isotopes of radon. Radon is a noble gas which can diffuse through the soil as well as disperse through the air. Therefore, the level of airborne radiation due to these radon isotopes and their daughter products at any specific location depends on a variety of factors, including meteorological conditions, the mineral content of the soil, and soil permeabi I ity. Typically, airborne radiation contributes from 1 to 10 percent of the natural background radiation levels. Cosmic rays interact with elements of the earth's atmosphere and soil. These interactions produce an additional natural source of gamma radiation.

Radiation levels due to cosmic rays vary with altitude from 3.3 11R/h at sea level to 12 11R/h at an altitude of 3 kilometers

.3 For Seabrook, New Hampshire, where the elevation varies from sea level to 100 meters , the cosmic ray contribution is about 3.6 11R/h. 4.0 SURVEY EQUIPMENT AND METHODS 4.1 Aircraft System A Messerschmitt-Bolkow-Biohm (MBB) B0-105 helicopter was used as the aerial platform (Figure 2). The aircraft carried two detector pods, each containing four 10.2-cm X 10.2-cm X 40.6-cm (4-in X 4-in X 16-in) log-type thallium-activated sodium iodide, Nai(T£), gamma detectors. Gamma signals originating in the Nai(T£) detectors were routed to the Radiation and FIGURE 1. GENERAL VIEW OF THE SEABROOK NUCLEAR STATION AND SURROUNDING AREA SHOWING THE STATION , SURVEY BOUNDARY, AND URS TRANSPONDER LOCATIONS FOR THE JULY 1988 SURVEY 6 FIGURE 2. MBB B0-105 HELICOPTER WITH DETECTOR PODS Environmental Data Acquisition and Recorder (REDAR IV) system for analog-to-digital sion and storage on magnetic tape. Pressure, temperature, and radar altitude transducer data were also acquired and stored by the REDAR. Real-time gamma energy spectra, total gamma count rates, and other data were output to a small CRT screen for the system operator.

The aircraft pilot was guided over the programmed flight lines by an indicator that derived its signal from the triangulation of the ultrahigh-frequency (UHF) transponders, located on the ground, and a master unit, located in the aircraft.

The position data were also recorded by the REDAR. 4.2 Data Van A minicomputer-based system (Figure 3) housed in a van was used during the survey to evaluate the aerial data obtained from each flight. The system contains hardware and software that operate on the survey data stored on the magnetic tape. The system operator can plot both gamma energy spectra from any portion of the gamma survey and count rate isopleths scaled to a map or photograph.

In this manner, gamma emitters, their intensity, and their location can be identified.

4.3 Survey Method A standardized procedure for aerial gamma surveys was followed during the survey of the Seabrook Nuclear Station. Steps in the procedure are as follows: 1. Two UHF transponders were placed outside the survey area: one in Epping, New 7 FIGURE 3. MOBILE COMPUTER PROCESSING LABORATORY Hampshire , and the other at Pease Air Force Base adjacent to Portsmouth , New shire. These two locations and the Seabrook Nuclear Station formed an approximate lateral triangle that optimized the positioning and steering of the aircraft during the survey. 2. A perimeter flight of roads in the survey area was then made. The transponder data from the perimeter flight were used to scale tances to a road map of the survey area. In this way, each subsequent gamma datum could be plotted accurately (within about 9 meters) on the map. 3. The locations of a test line and a water line were designated during the perimeter flight. Ocean Bay provided an expanse of water from which changing background atmospheric radon could be measured.

The 2-kilometer test line was directed from east to west. The test line followed utility power lines which were situated 3 kilometers south of Great Bay. This series of test and water lines flown before and after every individual flight served to monitor possible changes in system tivity and also functioned as survey data quality control. 4. Following the perimeter, test line, and water line flights, routine flights began. All survey lines were flown at an altitude of 91 meters. Each flight-preceded by a preflight in which the system was calibrated and the data tape was analyzed for proper system consisted of: a. A pass over the water line at survey altitude b. A pass over the test line at survey altitude c. Passes in an east/west direction following preprogrammed lines over the survey area d. A pass over the test line at survey altitude e. A pass over the water line at survey altitude Following each survey flight, the data were examined by computer to verify system integrity and validate data quality. 5. The aerial data were extrapolated to 1 meter above the ground, and a contour map was drawn of the exposure rates. A contour map was also drawn from an algorithm designed to show possible man-made gamma activity. 4.4 Aerial Photographs Oblique documentary aerial photographs were taken of the Seabrook Nuclear Station during the survey period. The photographs are stored at EG&G/EM and are available to qualified users. A high-altitude vertical photograph of the station was taken on 7 June 1988. This photograph serves as part of the map underlay in Figure 4. 4.5 Ground-Based Measurements Exposure rates were measured , and soil samples were obtained at seven locations (Figure 4) during the second week of the survey. These ments were made to support the integrity of the aerial results. A Reuter-Stokes pressurized ionization chamber was used for each exposure measurement.

Soil samples, to a depth of 15.0 em, were also obtained at the center and at four points of the compass on the circumference of a 120-meter diameter circular area centered at the position where the measurement was performed using the ionization chamber. The soil samples were dried, and their gamma activities were measured on a germanium-based detector system at the EG&G/EM Santa Barbara laboratory

.4*5 5.0 GENERAL DATA REDUCTION Two primary methods are used to evaluate the gamma flux measurements made with the aerial 8 system's Nal (T£) detectors.

The first is the gross count (GC) technique which is used to determine exposure rates. The second is the spectral window technique which is used to measure trations of specific nuclides. These and other methods are described in detail in a separate publication

.6 5.1 Gross Count Rate The gross count rate is defined as the integral count for 1 second in the energy spectrum tween 40 keV and 3,044 keV. 3,044 keV GC Energy Spectrum ( 1) E = 40 keV The integral includes all the natural gammas from potassium-40 (K-40), uranium-238 (U-238), thorium-232 (Th-232), and their decay products (the major terrestrial natural gamma emitters). Other natural contributors to this integral are cosmic rays, aircraft background , and airborne radon daughters. The altitudinal response of the aerial system for terrestrial gammas was measured over the test line. The survey count rates were then lated to 1 meter above the ground from the altitude response curve. The conversion from count rate to exposure rate was obtained from the documented test line in Calvert County, Maryland. The conversion equation is: ER(l m) GC(A)-B 1,450 where ER(l m) GC(A) Exposure rate extrapolated to 1 m above ground level (J1R/h) Gross count rate at alt i tude A (cps) A = Altitude (feet) B = Cosmic, aircraft, and airborne radon background (cps) a = Absorption coefficient.

Determined from altitude spiral data to be 0.002/ft (2) 0 N I 2 * <.. .. " .. ... .. CONVERSION SCALE GA MM A L E TTER EXP OSU R E R A TE* LABEL AT 1m (J1 R/h) A < 6 B 6-9 c 9-12 D 12-15 *Exposure rates are inferred from gamma count rates obtained at the survey a l ti-tude of 90m and extrapolated to the 1m level. Includes 3.6 J1R/h contribution from cosmic rays. FIGURE 4. TERRESTRIAL GAMMA EXPOSURE RATE CONTOUR MAP FROM THE JULY 1988 SURVEY OF THE SEABROOK NUCLEAR STAT/ON AND GROUND-BASED MEASUREMENT LOCATIONS 9

Equation 2 was used to compute the exposure rate from the terrestrial gross count rate. For the Seabrook survey, flown at 91 meters, Equation 2 becomes: ER(l m) GC-B 790 (3) The gross count has been used for many years in the aerial system as a measure of exposure rate. Its simplicity yields a rapid assessment of the gamma environment.

Anomalous or nonnatural gamma sources can often be found from increases in gross count rates. However, subtle anomalies are difficult to find using the gross count rate in areas where its magnitude is variable due to geologic or ground cover changes, for example. Differential energy data reduction methods, as discussed in the next section, are used to increase the aerial system's sensitivity to anomalous gamma emitters. 5.2 Spectral Windows The aerial system produces, each second, a gamma energy spectrum from which the GC is computed.

Generally, the ratio of natural ponents in any two integral sections (windows) of the energy spectrum will remain nearly constant in any given area: (ES) IE* (ES) = Constant = K (4) where ES = Energy spectrum E = Energy d>c2':b>a In practice, the value of K(Equation

4) is obtained from the natural terrestrial background of the survey area and the test line. Then Equation 4, in another form, is evaluated from the spectra obtained over the survey area: b S= E=a d (ES)-K

• E = c (ES) (5) 10 where S = net count rate (signal) from anomalous gamma rays (cps) The signal, S, will vary around zero and become significantly positive in the presence of anomalous gamma rays whose primary (unscattered) energy lies between a and b. The variance of S can be computed from the results of Equation 5 or from the energy window count rates. Equation 5 was applied to the Seabrook survey data in the search for possible man-made emitters. In the search, a was 40 keV, b=c was 1,400 keV, and d was 3,044 keV. These limits placed most of the long-lived, man-made gamma emitters within the signal window, S. 6.0 RESULTS 6.1 Exposure Rate Contour Map The exposure rate contour map , Figure 4, contains the principal results from the survey of the Seabrook Nuclear Station. This map shows the gamma exposure rate at 1 meter above ground level over the 247-square-kilometer mile) area surrounding the Seabrook station. The cosmic exposure rate7 (3.6 f..LR/h) was included in producing the contour levels, but the highly variable airborne r adon component (0 to 0.2 f..LR/h) was not. The contour map consists of approximately 46,000 data points , each representing 0.6 hectares (1.4 acres). Each data point includes a 1 ,000-channel gamma energy spectrum, a pressure and ture measurement, and measured spatial nates (altitude and two ranges from the sponders on the ground). The exposure rates are, in general, from 9 f..LR/h to 12 {.lR/h over the land areas. The wetlands were found to have lower exposure rates. Figure 5 shows a typical energy spectrum taken within the survey boundary.

In the survey region, only normal background sources of radiation were observed, as indicated in the figure. 6.2 Spectral Window Contour Map The spectral window technique was employed to produce a contour plot of S (Equation

5) over the 1.0 t----+-___,1---+--l--1---+------+

-+---+---+-+---t _jw w_j z<t: +.8 z&S <{ _j +.6 I_l O:::J a:LL W (f) CL 1-+.4 (J)Z i-:::J zo :::JO 0 v +.2 oo +.0 FIGURE 5. +5 1.0 214 Bi 1240 keV 40 K 1460 keV I 1.5 2.0 ENERGY (MeV) 20B TJ 2615 keV I 2.5 3.0 TYPICAL GAMMA ENERGY SPECTRUM OBTAINED WITHIN THE SURVEY BOUNDARY MINUS A BACKGROUND SPECTRUM TAKEN OVER GREAT BAY survey area in a search for man-made emitters. However, the contour map shows no evidence of any man-made emitters and, consequently, is not shown here. 6.3 Ground-Based Measurement Results lon chamber measurements and soil samples were collected at seven sites within the survey boundaries during the final week of the aerial 11 survey. The soil samples were dried and counted on a calibrated gamma spectrometer in the tory. The in-situ exposures were computed from the primary isot o pic concentrations in the soil samplesa and included the effect of soil moisture.e The exposure values are compared with the ion chamber measurements in Table 1. These exposure values represent the terrestr i al plus the cosmic components.

A small airborne radon component (0.2 J.1R/h or less) is also included in the ion chamber measurement.

Exposure values inferred from an isotopic analysis of the aerial data are also presented in Table 1. Exposure rate measurements on the ground agree well, within system uncertainties, w i th the sured aerial exposure rates. The isotopic centrations for the soil samples also agree within 30% of the aerial data. 7.0

SUMMARY

A 247-square-kilometer (96-square-mile) area, centered on the the Seabrook Nuclear Station near Seabrook, New Hampshire, was logically surveyed at an altitude of 91 meters utilizing the AMS. No significant abovebackground levels were observed. Average sure rates dete r mined for 1 meter above ground level were found to vary from 9 to 12 roentgens per hou r. No man-made radioisotopes were detected within the survey area.

Table 1. Comparison Between Ground-Based and Aerial Measurements Exposure Rate d Dry Soil Isotopic Compositionc (MR/h at 1 m AGL) Moistureb U-238 Th-232 Cs-137* K-40 Soil I on Site* Type % (ppm) (ppm) (pCi/g) (pCi/g) Data Chamber 1 Ground 4.3 +/- 1.2 2.0 +/- 0.4 6.9 +/- 1.2 0.25 +/- 0.04 15.6 +/- 0.6 9.6 +/- 0.8 9.1 +/- 0.5 Aerial 2.1 7.8 13.6 10.3 +/- 0.5 2 Ground 13 +/- 5 2.7 +/- 0.2 8.6 +/- 0.8 0.49 +/- 0.22 14.6 +/- 0.7 9.8 +/- 0.9 9.2 +/- 0.5 Aerial 3.6 8.2 11.4 10.6 +/- 0.5 3 Ground 21 +/- 5 2.9 +/- 0.6 10 +/- 2 0.40+/-0.16 14.5 +/- 0.4 10.0 +/- 1.0 9 +/- 10 Aerial 2.1 6.8 10.9 9.2 +/- 0.5 4 Ground 12 +/- 3 1.9+/-0.1 6.6 +/- 0.3 0.54 +/- 0.11 13.7 +/- 0.3 8.7 +/- 0.4 8.5 +/- 0.5 Aerial 1.6 4.5 7.8 9.0 +/- 0.5 5 Ground 60 +/- 2 3.1 +/- 0.1 9.4 +/- 0.4 0.12 +/- 0.01 15.4+/-1.0 8.4 +/- 0.4 {f) Aerial 1.8 5.4 8.1 8.7 +/- 0.5 6 Ground 8+/-1 2.0 +/- 0.1 7.5 +/- 0.2 0.16+/-0.01 16.7+/-1.0 9.7 +/- 0.4 (r) Aerial 2.3 5.8 13.3 9.3 +/- 0.5 7 g Ground 2+/-1 1.0 +/- 0.1 4.1 +/- 0.2 0.02 +/- 0.01 17.2+/-1.0 8.5 +/- 0.4 (r) Aerial 1.1 2.6 6.0 6.5 +/- 0.5 a The site locations are shown in Figure 4. b Aerially measured isotope concentrations were increased to account for using the soil sample moisture measurements. c The errors in the aerial isotopic measurement are not we l l determined to date. d E x posure rate includes the cosmic fraction of 3.6 J.1R/h and the effect of soil moisture. The ex po s ure rates from the isotopic concentrat i ons were compiled using Beck's conversions. a

• No attempt was made to e x tract the small Cs-137 count rates from the aerial data. rNo i on chamber data taken g Because S i te 7 was an isthmus more narrow than the aerial detector's f i eld of view , the a erial measurements w i l l underestimate the actual exposure rate. 12 Survey Site: Survey Coverage: Survey Date: Survey Altitude:

Aircraft Speed: Line Spacing: Line Length: Line Direction:

Number of Lines: Detector Array: APPENDIX A SURVEY PARAMETERS Seabrook Nuclear Station Seabrook , New Hampshire 247 sq km (96 sq mi) 6 July 1988 to 14 July 1988 91 m (300ft) 36 m/s (70 knots) 152 m (500 ft) 13 km (8 mi) East-West 124 Eight 1 0.2-cm X 1 0.2-cm X 40.6-cm (4-in X 4-in X 16-in) Nai(T£) detectors Acquisition System: REDAR IV Aircraft:

Survey Crew: Data Processing:

MBB B0-105 Helicopter P. Guss , J. Butler, L. Komich, R. Rea, C. Roberts, W. Verheyden, M. Haley, R. Mohr 1. Gross Count Window: 40 to 3,044 MeV 2. Conversion Factor: 790 cps per J1R/h 3. Cosmic Ray Contribution:

3.6 J1R/h 13 REFERENCES

1. Kwasnik, J. 1988. Private Communication.

New Hampshire Yankee Power Company, Seabrook Nuclear Station 2. Lindeken, C.L., eta/. 1972. "Geographical Variations in Environmental Radiation Background in the United States." Proceedings of the Second International Symposium on the Natural Radiation Environment.

7-11 August 1972, Houston, Texas: pp. 317-332. Springfield, VA: National Technical Information Service, U.S. Department of Commerce. 3. Klement, A.W., et at. August 1972. Estimate of Ionizing Radiation Doses in the United States 1960-2000. U.S. EPA Report No. ORD/CD72-1.

Washington , D.C.: Environmental Protection Agency. 4. Quam, W. and Engberg, K. October 1978. Low Background Ge(Li) Detector with Anticoincidence Nal Annulus. Report No. EGG-1183-2326.

Santa Barbara , CA: EG&G/EM. 5. Low Background Ge(Li) Detector Gamma-Ray Spectroscopy System with Sample Changer. Report No. EGG-1183-2383. Santa Barbara, CA: EG&G/EM 6. Boyns , P.K. July 1976. The Aerial Rad i ological Measuring System (ARMS): Systems , Procedures and Sensitivity. Report No. EGG-1183-1 691. Las Vegas, NV: EG&G/EM. 7. Environmental Radiation Measurements.

December 1976. NCRP Report No. 50, p. 30. Washington, D.C.: National Council on Radiation and Measurements. 8. Beck, H.L., eta/. September 1972. In Situ Ge(Li) and (Ti) Gamma-Ray Spectrometry.

Report No. HASL 258, TID-4500. Health and Safety Laboratory

U.S. Atomic Energy Commission. 9. Caroll, T.R. November 1981. " A i rborne Soi l Moisture Measurement Using Natural Terrestrial Gamma Radiation." Soil Science. Vol. 132 , No.5. 14 DISTRIBUTION NRC/HQ LBL E. D. Weinstein (1) H. A. Wollenberg NRC/REGION I R. J. Summers DOE/ONS W. F. Wolff DOE/OMA E. K. Matson DOE/OSTI S. F. Lanier DOE/NV J.D. Barrett G.M. Plummer (7) (5) ( 1) (2) ( 1 ) EG&G/EM P. K. Boyns Z.G. Burson H.W. Clark J. F. Doyle L.A. Franks P. P. Guss T. J. Hendricks H.W. Jackson D. A. Jessup K. R. Lamison H. A. Lamonds J. A. Michael C.K. Mitchell R. A. Mohr L.G. Sasso W.J. Tipton P. H. Zavattaro LIBRARIES AMO Archives ( 1) WAMD SEABROOK NUCLEAR STATION SEABROOK , NEW HAMPSHIRE EGG-10617-1013 DATE OF SURVEY: JULY 1988 DATE OF REPORT: SEPTEMBER 1989 ( 1 ) LVAO ( 1) LVAO ( 1 ) LVAO ( 1) LVAO ( 1) SBO ( 1) WAMD ( 1 ) LVAO ( 1) SBO ( 1) SBO (2) WAMD (5) LVAO ( 1) LVAO ( 1) LVAO ( 1) SBO ( 1) LVAO ( 1 ) LVAO ( 1) LVAO ( 1) (1 0) ( 1 ) ( 1)