ML19323B208

Aerial Radiological Survey of Area Surrounding United Nuclear Corp Recovery Sys Facility,Aug 1979

ML19323B208
Person / Time
Site:	Wood River Junction
Issue date:	12/31/1979
From:	Bluitt C, Stobie G, Stuart T EG&G, INC.
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ML19323B204	List: ML19323B203 ML19323B208
References
EGG-1183-1756, UC-41, NUDOCS 8005120080
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Q; Q g:p Qeff n; 3 c AN AERIAL RADIOLOGICAL SURVEY OF THE AREA SURROUNDING THE UNC RECOVERY SYSTEMS FAC:L TY WOOD RIVER JUNCTION, RH' ODE ISLAND DATE OF SURVEY: AUGUST 1979

O S' NOTICE E This report was prepared to document work sponsored by the United States Government. Neither the United States, nor its agent, the United States Department of Energy, nor any Federal employees, nor any of their contractors, subcontractors, or 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 to a company or product name does not imply approval or recommendation of the product by EG&G or the United States Department of Energy to the exclusion of others that may be suitable. g, S, S' l Printed in the United States of America. Available from: 9. National Technical Information Service U.S. Department of Commerce 5285 Port Royal Road Springfield, Virginia 22161 O Price: Printed Copy $4.00 Microfiche $3.00 O'

i EGG-1183-1756 f,ENERGYMEASUREMENTS GROUP es,o December 1979 AN AERIAL RADIOLOGICAL SURVEY OF THE AREA SURROUNDING THE UNC RECOVERY SYSTEMS FACILITY WOOD RIVER JUNCTION, RHODE ISLAND DATE OF SURVEY: AUGUST 1979 ) C. M. Bluitt Project Scientist ) APPROVED FOR PUBLICATION ~ T. P. Stuart, Manager ) Remote Sensing Sciences Department This Document is UNCLASSIFIED ) G. P. Stobie Classification Officer This work was performed by EG &G for the United States Nuclear Regulatory Commission through an EAO transfer of funds to Contract Number DE-ACO8-76NVO1183with the United States Department of Energy. )

2 o ABSTRACT An aerial radiological survey tc. measure terrestrial gamma radiation was carried out over the UNC S Recovery Systems facility located near Wood River Junction, Rhode Island. At the time of the survey (August 1979) materials were being processed at the facility. Gamma ray data were collected over a 3.63 km2 area centered on the facility by flying north-south lines spaced 60 m apart. Processed data indicated that detected radioisotopes and their associated gamma ray exposure rates were consistent with those expected from normal background emitters, except at certain g locations described in this report. Average exposure rates 1 m above the ground, as calculated from the aerial data, are presented in the form of an isopleth map. No ground sample data were taken at the time of the aerial survey. O, 6: 6:

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3 CONTENTS Abstract 2 Sections 1.0 Introduction 5 2.0 Survey Area Location 5 3.0 Survey Method and Airborne Equipment 5 4.0 Data Processing 6 ( 5.0 Discussion and Results 6 Figures ( 1 Flight Lines 4 2 BO-105 Helicopter 5 3 Mobile Computer Processing Laboratory 6 I 4 Gross Count Exposure Rate Isopleth Map 7 5 Energy Spectrum Observed over the Site 8 6 Energy Spectrum Observed over Northwest Corner of the Site 8 9 Appendix 9 I 9

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The distance scale should read as follows:

0 100 200 300 400 METERS I I I I O 300 600 900 1200 1500 FEET l UNC RECOVERY SYSTEMS FACILITY WOOD RIVER JUNCTION, RHODE ISLAND EGG-1183-1756 l Date of Survey: August 1979 Date of Report: December 1979 Date of Erratum: February 1980

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1.0 INTRODUCTION

The purpose of this aerial survey was to ) document, at a given point in time, the loc & tion of all areas containing gamma emitting radioactivity (visible at the surface) and to aid local personnel in evaluating the magnitude and spatial extent of any radioactive contaminants released into the ']~N ~ ~ ~ - m environment. This survey was conducted by ,, a Q ) Aerial Measuring Systems (AMS).*

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_.--C f, 4 _.. ' y AMS is maintained by the United States NF# T-Department of Energy (DOE) and operated by ' ~- y ~ ". 7 Dx EG&G. Begun in 1958, AMS is a continu-Awp e. sm c ing nationwide program involving surveys to ,,; - C a =4.*4 ~ ; - _. n

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) monitor radiation levels in and around facilities %e producing, utilizing, or storing radioactive g *- 7~. m ;a materials. AMS is deployed for various aerial survey operations at the request of DOE, other Figure 2. BO t05 HEllCOPTER federal agencies (such as the United States This aircraft contains the REDAR system. Nuclear Regulatory Commission), and state ) agencies. Acquisition and Recorder system (REDAR). The On 1 August 1979 this survey was conducted detectors were contained in an aluminum box from a base of operations at Quonset Point Naval extended from the rear of the helicopter. Each Air Station, Rhode Island. The f acility surveyed is detector is 12.7 cm in diameter and 5.1 cm in the UNC Recovery Systems facility. height. Gamma ray signals from the 20 detectors were summed and routed through an analog-to- ) The facility receives highly enriched uranium digital converter and a pulse height analyzer. which is processed to yield fuel for various uses in Gamma spectra were accumulated in 1 second test reactor operations. intervals and recorded on 1/2 inch magnetic tape. The helicopter position was established with two 2.0 SURVEY AREA LOCATION systems: a Trisponder/202A Microwave Ranging ) An area 3.63 km2 was surveyed. This area was System (MRS) and an AL-101 radio altimeter. The centered on the UNC Recovery Systems facility. Trisponder master station mounted in the This facility is located 1.2 km southwest of Wood helicopter interrogated two remote transceivers River Junction and 1 km north of Indian Cedar mounted on towers outside the survey area. By measuring the round trip propagation time Swamp. between the master and remote stations the master computed the distance to each (see ) 3.0 SURVEY METHOD AND AIRBORNE Appendix). These distances were recorded on EQUIPMENT magnetic tape each second. In subsequent i computer processing they were converted to An enlarged aerial photo of the site was used to positon coordinates. lay out the survey flight lines. The survey pattern consisted of 25 parallel lines spaced at 60 m in like manner the radio altimeter measured the ) intervals, 4.5 km in length. The flight lines were time lag for the return of a pulsed signal and oriented in an east-west direction (Figure 1). converted this to aircraft altitude. For altitudes up Flight altitude was 45 meters. to 150 m, the accuracy was 10.6 m or i2%, whichever is greater. These data were also A B0-105 helicopter was utilized for the survey recorded on magnetic tape so that any variations (Figure 2). The BO-105 carried a crew of two: pilot in gamma signal strength caused by altitude and navigator, it employed a lightweight version fluctuation could be compensated accurately. of the Radiation and Environmental Data

• Formerly the AerialRadiological Measuring System The detectors and electronic systems which

( ARMS) accumulate and record the data are described

l 6 4 o briefly here. They are described in detail in a kev and 3000 kev) were corrected for system l previous report.* dead time and altitude deviation. Corrections to I the gross count rates were also made for contrMons kom radon, akcran badground, O j 4.0 DATA PROCESSING and cosmic rays. Flights over a lake near Wood Data processing was done with the Radiation and River Junction were used for this purpose. Environmental Data Analyzer and Computer The corrected gross count rates were converted system (REDAC). This is a computer analysis to exposure rates at 1 m altitude with the factor laboratory mounted in a mobile van (Figure 3). 1100 counts per second (cps) per R/h obtained g The van and aircraft were based at the Quonset from calibration data over a Nevada test range. j Point Naval Air Station. The REDAC consists pnmarily of two Cipher 5.0 DISCUSSION AND RESUL'S Data tape drives, a Data General NOVA 840 computer, two Calcomp plotters, and a Analysis of the radiological data taken over the Tektronics CRT display screen. The computer area surrounding the UNC Recovery Systems 9 has a 32 k-word core memory and an additional facility indicated that the terrestrial radioisotopes 1.2 X 106-word disc memory. An extensive and associated gamma ray exposure rates were collection of software routines is available for consistent with the natural background normally data processing. found within areas having similar geological bases. The gross count data (integral counts between 50 g Figure 4 presents exposure rate isopleths

• Boyns. P.K. July 1976. The Aerial Radiological Measuring System (ARMS): Systems. Procedures, superimposed on an aerial photograph of the site.

and Sensitivity (7976). Report No. EGG-1183-:691. The background in the area is in the range of l Las Vegas NV: EG&G. 3-4 R/h. l 9 n ..g-m _g N N*.i r { [h, 6 l ~ j ? b,' @ ', r~, ? c g j d + j p V ~L l _h. Ih ~ T y f I'k N m (t

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,t* r,. o>, W~ e w p ... y. ye i 4 1 i 'D* ]D' D'T o e Ju o f 1 .= D t 8 Figure 5 presents the energy spectrum of the high Figure 6 shows a spectrum over the northwest radiation level observed over the site due to corner of the site due to an increase in naturally contributions from enriched uranium. occurring radio isotopes. The photo shows this area to be under construction on a type of gravel pit. i.e : i.o : l \\ 4, 3, ,.e. u.e. aY J 50 $M ga.s-g q ..s vy Cy { m' y w *.. e'.... \\ gw w5 w5 5S., 5 8..,. ( Q* i o r* .., I w .e .s s.o n.s e.c c.s sc ..o .s i.o i.s e.o e.s s.o ENERGY (MEV) ENERGY (MEV) Figure s. ENERGY SPECTRUM OBSERVED QVER THE Figure 6. ENERG Y SPECTRUM OBSERVED OVER SITE NORTHWEST CORNER OF THE SITE t ( 4 ( n:- g 1 ( \\ APPENDIX

• Steering Indicator Calculator System The heart of this system is a programmable desk-

) Microwave Ranging System and Steering top calculator which weighs only 25 pounds indicator / Calculator (Hewlett-Packard 9825A). It is programmablein a high level language (similar to FORTRAN) and A line-of-sight, X-band microwave system, has about 6800 bytes of user memory for program comprised of a master (aircraft) and two remote and data storage. The unit also contains a drive (ground) stations, is used to determine the mechanism for magnetic tape cartridges, a small ) distance of the aircraf t from the ground stations. thermal printer, and a 32-character display. The Each of the three transceiver units provides an use of a high level language facilitates output of up to one kilowatt peak power. The modification of the calculator program to fit system is capable of measuring ranges up to 100 unique field situations. nautical miles under line-of-sight conditions. Resolution of the system is one foot, and A special interface circuit effects compatibility ) accuracy is better than t 10 feet. Transmissions between the MRS's 24 data output lines and 2 are coded to differentiate between the two strobes with the calculator's 16 byte input data ground-based transponders. Signals from the buss, control, and status lines. Also provided in transponders are at a frequency different from this circuit is a digital-to-analog converter to the master's in order to guard against ranging drive the pilot's steering meter. The interface is f rom the master to microwave-reflecting objects. under the direct control of the calculator ) A control unit in the aircraft initiates a complete interrogation cycle every 250 milliseconds. This cycle consists of a group of pulses to establish Calculator Program which of the two transponders is being interrogated, followed by ranging pulses (up to Arithmetic calculations, using the actively measured ranges, are performed by the forty) until ten valid returns have been received. ) The control unit then outputs the average calculator to do the following: measured range to external equipment. If ten

• Measure the distance between the two valid returns are not received, the control unit will ground stations (the " baseline" length).

output a "zero-range" to the external equipment. Translate and rotate the desired survey grid The procedure is repeated for the second transponder. To acquire, the two ranges may take from the orthogonal system of the baseline to from 45 milliseconds to 140 milliseconds. The an orthogonal system centered on two microwave system idles for the remainder of the observable terrain features. 250 millisecond cycle. Provide the pilot with left/right steering information. External Equipment Use of MRS Ranges Provide the SIC operator with information on ) External equipment receiving range data from the line number, direction of flight, steering error, control unit are the Radiation Data Acquisition in or out of survey area, distance to end (or and Recorder system (REDAR) and the Steering beginning) of line, and ground speed. Indicator Calculator (SIC). A range pair is recorded on the REDAR tape along with the concurrent radiation data for each 1 second of Operational Sequence ) data acquisition. The processing of REDAR tape The relative location of the survey area with recorded ranges is desenbed elsewhere. The respect to the baseline (i.e., "above" or "below") steen,ng Indicator / calculator reads in a range pair must first be keyed into the calculator in order to every quarter-second. These data are processe remove the positional (bipartite) ambiguity in real time to give tha aircraft pilot an on-line or caused by the MRS giving only two ranges and no quantitative left-or right-of-line indication, angular information. Prior to the start of the actual survey certain flight Written by A.E. Villaire. May 1979. Las Vegas, NV: EG&G maneuvers are required to measure parameters. ) 7 10 Baseline measurement: the distance between also enter values representing the the ground-based transponders is measured longitudinal extent of the lines. The latter by flying across the baseline (preferably mid-option is sometimes not used for extremely way) at as low an altitude as is practical. The long lines where loss of reliable signal O value calculated for the baseline length is the determines the ends of the lines. All these minimum of the sum of the two ranges. data are printed out and are recorded on tape so they may be recalled for use at another

• Survey orientation and location: the aircraft crew must find two terrain features, natural or The survey then proceeds with the operator 9

man-made, that can also be found on the map keying in the initial line number and direction or aerial photo depicting the survey lines of flight (handled simply as "+" or " "). At the instantaneous ranges measured while end of a line, the operator increments or passing directly over these features are decrements the line number and reverses the entered in the calculator memory using a sign of the flight direction. The pilot, after " hack" button. The two range pairs obtained negotiating a turn, may use the steering 9 are used by the program to calculate the meter to "home in" on the new line. The angle between the baseline and the survey operator may relay to the pilot the distance to lines and the of fset of the survey area from the the start of the line (if the longitudinalextent baseline. If.. iwo nack points do notlieon a values were keyed in) so that no harsh line parallel to the desired survey lines, an maneuvers are required in order to start the angular correction may be manually entered next line. (Even moderate aircraft banking g in the calculator. The operator must then key causes loss of microwave signal es the in the intended survey line spacing; he may fuselage or wings occlude the line of sight). t I ei et l l 6 O~ DISTRIBUTION NRC LBL B. H. Weiss (15) H. A. Wolfenberg (1) DOE /OES EG&G L. J. Deal (5) C. M. Bluitt, LVAO (1) H.M. Borella, SBO (2) J. F. Doyle, LVAO (1) DOE /MA W. A. Frankhauser, WAMD (2) R. G. Shull (1) L. A. Franks, SBO (1) H. A. Lamonds, SBO (1) R. E. Lounsbury, WAMD (2) DOE / TIC R. L. Lynn, SBO (1) T. C. Maguire, WAMD (1) T. B. Abernathy (2) R. A. Mohr, SBO (1) L. G. Sasso, LVAO (1) G. R. Shipman, WAMD (1) DOE /NV G. P. Stobie, LVAO (1) H. F. Hahn, EMO (1) E. J. Story, LVAO (1) D.G. Jackson (3) T. P. Stuart, LVAO (),' J. A. Koch (1) W. J. Tipton, LVAO (1) R. R. Loux (1) G.G. Widner, LVAO (1) J. K. Magruder (1) R. B. Purcell (2) LIBRARIES H&N AMO (50) Las Vegas (1) W. E. Anderson (1) Sant' Barbara (2) UNC RECOVERY SY6TEMS FACILITY WOOD RIVER JUNCTION. RHODE ISLAND EGG-1183-1756 DATE OF SURVEY: AUGUST 1979 CATE OF REPORT: DECEMBER 1979 l}}